JPH09117794A - Biological denitrification device - Google Patents
Biological denitrification deviceInfo
- Publication number
- JPH09117794A JPH09117794A JP7300413A JP30041395A JPH09117794A JP H09117794 A JPH09117794 A JP H09117794A JP 7300413 A JP7300413 A JP 7300413A JP 30041395 A JP30041395 A JP 30041395A JP H09117794 A JPH09117794 A JP H09117794A
- Authority
- JP
- Japan
- Prior art keywords
- denitrification
- nitrification
- liq
- section
- membrane unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012528 membrane Substances 0.000 claims abstract description 66
- 230000000694 effects Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 31
- 238000001914 filtration Methods 0.000 claims description 28
- 238000005273 aeration Methods 0.000 claims description 8
- 230000001546 nitrifying effect Effects 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 230000001770 denitrificating effect Effects 0.000 abstract 2
- 230000001657 nitrificating effect Effects 0.000 abstract 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- 239000010802 sludge Substances 0.000 description 15
- 229910017464 nitrogen compound Inorganic materials 0.000 description 11
- 150000002830 nitrogen compounds Chemical class 0.000 description 11
- 239000012466 permeate Substances 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000000813 microbial effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 230000004071 biological effect Effects 0.000 description 2
- 230000031018 biological processes and functions Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 239000000852 hydrogen donor Substances 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、し尿、下水、食品
排水及び各種産業排水などの窒素化合物を含有した有機
性廃水を生物学的に脱窒処理すると共に、濾過膜モジュ
−ルを浸漬配置して処理槽内で汚泥と透過水とに分離す
る生物学的脱窒処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention biologically denitrifies organic wastewater containing nitrogen compounds, such as human waste, sewage, food wastewater and various industrial wastewater, and dips the filter membrane module. The present invention relates to a biological denitrification treatment device for separating sludge and permeated water in a treatment tank.
【０００２】[0002]
【従来の技術】従来、アンモニアなどの窒素化合物を含
有する有機性廃水は、好気性及び嫌気性の生物処理装置
を用いて、生物学的にＢＯＤ、ＣＯＤ成分などの有機物
を分解処理すると共に、窒素化合物の脱窒処理も同時に
行っている。2. Description of the Related Art Conventionally, organic wastewater containing a nitrogen compound such as ammonia is biologically decomposed to decompose organic substances such as BOD and COD components by using an aerobic and anaerobic biological treatment apparatus. Denitrification treatment of nitrogen compounds is also performed at the same time.
【０００３】前記生物処理装置としては、好気性状態で
廃水中の窒素化合物を生物学的に酸化して窒素酸化物を
生成する硝化槽と、生成した窒素酸化物を嫌気性状態で
生物学的に還元し窒素ガスとして除去する脱窒槽とを設
けた生物学的脱窒処理装置が一般的に実施されており、
またその一つの装置として、脱窒槽に硝化槽の硝化液を
循環すると共に、有機性廃水の原水を供給して脱窒処理
する循環脱窒処理装置がある。As the biological treatment apparatus, a nitrification tank which biologically oxidizes nitrogen compounds in wastewater to produce nitrogen oxides in an aerobic state, and a nitrogen oxide produced in an anaerobic state are biologically treated. A biological denitrification treatment device provided with a denitrification tank for reducing to and removing as nitrogen gas is generally practiced,
Further, as one of the devices, there is a circulation denitrification treatment device which circulates the nitrification liquid in the nitrification tank in the denitrification tank and supplies the raw water of the organic wastewater for denitrification.
【０００４】また、硝化槽や脱窒槽などの生物処理槽内
に、精密濾過膜や限外濾過膜を用いた円筒、中空糸及び
円板や矩形板状の平膜などで構成された濾過膜モジュ−
ルを浸漬配置し、処理槽内で汚泥と透過水とに分離して
処理槽内の微生物濃度を高く保持し、高負荷運転を維持
すると共に、汚泥を分離する沈殿槽を不要とし、直ちに
透過水を処理水として排出できる生物処理装置なども用
いられている。Further, in a biological treatment tank such as a nitrification tank or a denitrification tank, a filtration membrane composed of a cylinder using a microfiltration membrane or an ultrafiltration membrane, a hollow fiber and a disc or a flat membrane in the shape of a rectangular plate. Module
In order to maintain a high microbial concentration in the treatment tank by separating it into sludge and permeated water in the treatment tank, maintain high load operation, and eliminate the need for a sedimentation tank to separate sludge, and to immediately permeate it. Biological treatment devices that can discharge water as treated water are also used.
【０００５】尚、前記濾過膜モジュ−ルを浸漬配置した
生物処理装置にあっては、濾過膜表面に汚泥などのスラ
イムまたはスケ−ルなどが付着して濾過効率が低下する
のを防止するため、濾過膜の下方から空気などの気体を
散気させて、気体により濾過膜表面を洗浄している。In the biological treatment apparatus in which the filtration membrane module is arranged by immersion, in order to prevent the slime or scale of sludge or the like from adhering to the surface of the filtration membrane and reducing the filtration efficiency. A gas such as air is diffused from below the filter membrane to clean the surface of the filter membrane with the gas.
【０００６】[0006]
【発明が解決しようとする課題】前記従来の循環脱窒処
理装置では、硝化槽内に多量の気体を散気して好気性雰
囲気を維持すると共に、原水の３〜６倍の硝化液を硝化
槽から脱窒槽に循環ポンプで循環しており、更に、後段
には処理水から汚泥を沈降分離するための沈殿槽が配置
されているが、前記汚泥は微細フロックとなりやすいた
め、沈殿槽での沈降速度が遅く、沈殿槽の設置面積が広
く必要となるなどのため、設備費や動力費が嵩む欠点が
ある。In the above-mentioned conventional circulating denitrification treatment apparatus, a large amount of gas is diffused in the nitrification tank to maintain an aerobic atmosphere, and nitrification solution having 3 to 6 times the raw water is nitrified. It is circulated by a circulation pump from the tank to the denitrification tank, and further, a settling tank for settling and separating sludge from the treated water is arranged at the latter stage, but since the sludge easily becomes fine flocs, Since the settling speed is slow and the settling tank requires a large installation area, there is a drawback that equipment costs and power costs increase.
【０００７】また、前記濾過膜モジュ−ルを浸漬配置し
た生物処理装置にあっては、生物処理液中の汚泥やタン
パク質などの高分子物質が濾過膜表面に付着し、膜透過
液量が減少するため、気体の散気によって乱流を起こ
し、そのせん断力によって付着物の剥離をおこなってい
るが、前記高分子物質は極めて濾過膜表面に付着しやす
く、粘着性もあるため剥離しにくく、散気量も必要以上
に多くなって手数や動力費が嵩むと共に、本装置でも硝
化液を脱窒槽に循環するための循環ポンプが必要であ
り、そのため設備費や動力費が嵩む欠点がある。Further, in the biological treatment device in which the filtration membrane module is immersed and arranged, high molecular substances such as sludge and proteins in the biological treatment liquid adhere to the surface of the filtration membrane, and the amount of the membrane permeate decreases. Therefore, turbulent flow is caused by gas diffusion, and the adhered matter is peeled off by the shearing force, but the polymer substance is extremely easy to adhere to the surface of the filtration membrane, and is also difficult to be peeled off because it has adhesiveness, The amount of air diffused becomes unnecessarily large, which increases labor and power costs, and also in this apparatus, a circulation pump for circulating the nitrification liquid to the denitrification tank is required, which results in a high facility cost and power cost.
【０００８】従って本発明は、有機性廃水中の窒素化合
物を除去するにあたり、硝化部から硝化液を脱窒部に循
環して脱窒処理する循環脱窒処理装置において、硝化部
と脱窒部との液循環を行う循環ポンプを不要とし、更に
汚泥を沈降分離する沈殿槽も不要とすることにより、設
備費や動力費をできるだけ低減する生物学的脱窒処理装
置を提供する目的で成されたものである。Therefore, in the present invention, in removing a nitrogen compound in organic wastewater, a nitrification section and a denitrification section are provided in a circulation denitrification treatment apparatus for circulating the nitrification liquid from the nitrification section to the denitrification section for denitrification treatment. The purpose of the present invention is to provide a biological denitrification treatment device that reduces equipment costs and power costs as much as possible by eliminating the need for a circulation pump for liquid circulation with and a sedimentation tank for sedimentation and separation of sludge. It is a thing.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するた
め、生物処理槽内に固液分離用の濾過膜モジュ−ルを浸
漬配置すると共に、好気性雰囲気を維持する散気手段と
濾過膜表面を洗浄する散気手段を単一化し、微生物濃度
を高く保持して高負荷運転による効率的な硝化処理を可
能とし、また散気による気体のエアリフト効果で硝化液
を脱窒部に循環するようにしたものであり、その要旨
は、下部に脱窒液流入口、上部に硝化液流出口を具備
し、上端面が開放されたケ−シング内に複数の濾過膜モ
ジュ−ルを立設して水平方向に並設し、濾過膜モジュ−
ルの下方に散気手段を配置して成る浸漬膜ユニットを生
物処理槽内に浸漬配置し、前記生物処理槽の浸漬膜ユニ
ット内を硝化部、浸漬膜ユニット外を脱窒部としたこと
を特徴とする生物学的脱窒処理装置である。In order to achieve the above-mentioned object, a filter membrane module for solid-liquid separation is immersed in a biological treatment tank, and a diffusing means for maintaining an aerobic atmosphere and a filter membrane surface. A single diffusing means for cleaning the slag is used to maintain a high microbial concentration to enable efficient nitrification treatment under high load operation, and the nitrification solution is circulated to the denitrification section by the air lift effect of gas due to diffusion. The outline is that the lower part has a denitrification solution inlet, the upper part has a nitrification solution outlet, and a plurality of filtration membrane modules are installed upright in a casing with an open upper end surface. Installed side by side in the horizontal direction, and the filtration membrane module
A submerged membrane unit having an aeration means disposed below the cell is immersed in the biological treatment tank, and the inside of the submerged membrane unit of the biological treatment tank is used as a nitrification section and the outside of the submerged membrane unit as a denitrification section. It is a characteristic biological denitrification treatment device.
【００１０】[0010]
【作用】生物処理槽に浸漬配置された浸漬膜ユニット内
の硝化部から、ケ−シング下部の硝化液流出口を経て、
浸漬膜ユニット外の脱窒部にエアリフト効果による水頭
差で循環された硝化液は、脱窒部に供給された原水中の
有機物が、脱窒菌などの通性嫌気性菌の生物活性維持の
ための炭素源及び水素供与体として利用され、硝酸態や
亜硝酸態などの窒素酸化物が還元分解され窒素ガスとし
て排出される。[Operation] From the nitrification section in the submerged membrane unit immersed in the biological treatment tank, through the nitrification solution outlet at the bottom of the casing,
The nitrification solution circulated in the denitrification section outside the submerged membrane unit due to the head difference due to the air lift effect, the organic substances in the raw water supplied to the denitrification section are used to maintain the biological activity of facultative anaerobic bacteria such as denitrifying bacteria. It is used as a carbon source and a hydrogen donor, and nitrogen oxides such as nitric acid and nitrite are reduced and decomposed and discharged as nitrogen gas.
【００１１】脱窒処理された脱窒液は、脱窒部からケ−
シング下部の脱窒液流入口を経て硝化部に供給され、散
気手段から散気される空気などの酸素含有気体によって
好気性雰囲気とされ、残余の有機物及び窒素化合物が硝
化菌などの好気性菌の生物学的作用で酸化分解されると
共に、アンモニアなどの窒素化合物が硝酸態や亜硝酸態
などの窒素酸化物に酸化される。The denitrification solution subjected to the denitrification treatment is discharged from the denitrification section.
It is supplied to the nitrification part through the denitrification liquid inlet at the bottom of the singing and is made an aerobic atmosphere by the oxygen-containing gas such as air diffused from the aeration means, and the remaining organic substances and nitrogen compounds are aerobic such as nitrifying bacteria. The biological action of the bacterium causes oxidative decomposition, and at the same time, nitrogen compounds such as ammonia are oxidized to nitrogen oxides such as nitrate and nitrite.
【００１２】また、硝化部に供給された脱窒液は、散気
手段から散気される気体によるエアリフト効果により、
濾過膜モジュ−ル間を上向流通する間に固液分離され、
膜透過液は処理水として系外に排出され、汚泥は硝化部
に滞留して微生物濃度が高く保持され、高負荷運転によ
る効率的な硝化処理が行われる。Further, the denitrification liquid supplied to the nitrification section is caused by the air lift effect of the gas diffused from the diffuser means.
Solid-liquid separation is performed while flowing upward between the filtration membrane modules,
The membrane permeate is discharged outside the system as treated water, and the sludge is retained in the nitrification section to maintain a high microbial concentration, and efficient nitrification treatment is performed by high load operation.
【００１３】従って、前記硝化部では、単一の散気手段
で好気性雰囲気の維持と濾過膜表面の洗浄が行われ、ま
た濾過膜モジュ−ルで固液分離されるため、汚泥を沈降
分離する沈殿槽が不要となり、設備費や動力費が低減さ
れると共に、従来は硝化槽から原水の３〜６倍の硝化液
を循環流路及びポンプを用いて脱窒槽に循環していたた
め、動力費などが嵩んでいたが、本発明の生物学的脱窒
処理装置では、硝化液の脱窒槽への循環をエアリフト効
果による水頭差で行っているため、更に動力費などの低
廉化が図られる。Therefore, in the nitrification section, the aerobic atmosphere is maintained and the surface of the filtration membrane is washed by a single diffusing means, and the sludge is separated by solid-liquid separation by the filtration membrane module. Since the settling tank that operates is not required, the equipment cost and power cost are reduced, and conventionally, the nitrification solution that is 3 to 6 times as much as the raw water is circulated from the nitrification tank to the denitrification tank using the circulation channel and pump. Although the cost was high, in the biological denitrification treatment apparatus of the present invention, the nitrification liquid is circulated to the denitrification tank by the head difference due to the air lift effect, so that the cost of the power and the like can be further reduced. .
【００１４】[0014]
【発明の実施の形態】本発明の実施例を図面に基づいて
説明する。図１は本発明の一実施の形態の生物学的脱窒
処理装置の概略縦断面図であり、図２は図１の概略平面
図である。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic vertical sectional view of a biological denitrification treatment apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic plan view of FIG.
【００１５】１は嫌気性の脱窒部３と好気性の硝化部２
から成り、底部に汚泥抜き出し流路１５を接続した生物
処理槽であり、硝化部２は下部に脱窒液流入口１０、上
部に硝化液流出口１１を具備し、上端面が開放し隔壁で
水平方向に区画されたケ−シング６内に複数の板状濾過
膜モジュ−ル５を立設して水平方向に並設し、濾過膜モ
ジュ−ル５の下方に散気手段７が設けられた浸漬膜ユニ
ット４を、上端が生物処理槽１内の液面上に突出するよ
う浸漬し、複数並設配置して構成してある。Reference numeral 1 denotes an anaerobic denitrification section 3 and an aerobic nitrification section 2.
And a nitrification section 2 having a denitrification solution inlet 10 in the lower part and a nitrification solution outlet 11 in the upper part, and the upper end surface is open to form a partition wall. A plurality of plate-shaped filtration membrane modules 5 are erected vertically in a casing 6 partitioned in the horizontal direction and arranged in parallel in the horizontal direction, and an air diffusing means 7 is provided below the filtration membrane module 5. A plurality of the submerged membrane units 4 are immersed so that the upper end thereof projects above the liquid surface in the biological treatment tank 1, and a plurality of the submerged membrane units 4 are arranged side by side.
【００１６】脱窒部３は、有機性廃水の原水供給流路１
２が上部に接続し、底部に液攪拌用の攪拌機１６が載置
され、上面が覆蓋され一側面が脱窒液流入口１０及び硝
化液流出口１１を具備した浸漬膜ユニット４のケ−シン
グ６側面を共有壁とした密閉構造となっている。The denitrification section 3 is a raw water supply channel 1 for organic wastewater.
2 is connected to the upper part, a stirrer 16 for liquid stirring is placed on the bottom part, the upper face is covered, and the casing is a casing of the submerged membrane unit 4 having a denitrifying liquid inlet 10 and a nitrifying liquid outlet 11 on one side. It has a sealed structure with six side walls as common walls.
【００１７】前記脱窒部３及び硝化部２を区画する浸漬
膜ユニットのケ−シング６側面に具備した硝化液流出口
１１は、硝化液が硝化部２から脱窒部３にエアリフト効
果による水頭差で流入するように配置され、また散気手
段７から散気する気体は、濃縮酸素や空気などの酸素含
有気体が用いられるが空気が好ましい。The nitrification solution outlet 11 provided on the side surface of the casing 6 of the submerged membrane unit for partitioning the denitrification section 3 and the nitrification section 2 is provided with a nitrification solution outlet 11 from the nitrification section 2 to the denitrification section 3 due to the airlift effect. An oxygen-containing gas such as concentrated oxygen or air is used as the gas which is arranged so as to flow in with a difference and which is diffused from the diffuser 7 and is preferably air.
【００１８】５の濾過膜モジュ−ルは、ポリエチレン
系、セルロ−スアセテ−ト系、芳香族ポリアミド系及び
ポリスフォン系などの有機膜で孔径が０．１〜１μｍの
精密濾過膜や分画分子量数万〜数１０万程度の限外濾過
膜などを張設した矩形板状の平膜モジュ−ルであるが、
中空糸及び不織布成形体の表面に前記膜を貼着した円筒
状や円板状などの濾過膜、またはセラミックス膜などの
無機材料を用いてもよい。The filtration membrane module 5 is an organic membrane such as polyethylene type, cellulose acetate type, aromatic polyamide type and polysulfone type, which is a microfiltration membrane having a pore size of 0.1 to 1 μm and a molecular weight cutoff. Although it is a rectangular plate-shaped flat membrane module stretched with tens of thousands to hundreds of thousands of ultrafiltration membranes,
An inorganic material such as a cylindrical or disc-shaped filtration membrane having the membrane adhered to the surfaces of the hollow fiber and the nonwoven fabric molded body or a ceramic membrane may be used.
【００１９】また濾過膜モジュ−ル５には、それぞれの
濾過膜からの透過液を排出する透過液の排出流路１３が
接続され、排出流路１３に配置された減圧装置である透
過液抜き出しポンプ９により減圧吸引濾過されるが、透
過液抜き出しポンプ９による吸引圧は通常−１，０００
〜−３，０００ｍｍＡｑが好ましい。The filtration membrane module 5 is connected to a permeated liquid discharge channel 13 for discharging the permeated liquid from each of the filtration membranes, and a permeated liquid withdrawal unit which is a decompression device disposed in the discharge channel 13 is taken out. Although it is suction-filtered under reduced pressure by the pump 9, the suction pressure by the permeate extraction pump 9 is usually -1,000.
~ -3,000 mmAq is preferred.
【００２０】本実施の形態では、ケ−シング６内に立設
して複数の濾過膜モジュ−ル５を水平方向に並設して成
る浸漬膜ユニット４を、生物処理槽１内に複数並設設置
しているが、濾過膜モジュ−ル５の並設枚数や浸漬膜ユ
ニット４の設置数及び透過液抜き出し量などは、処理す
る原水の処理量や性状及び窒素化合物含有濃度などによ
り決定される。In the present embodiment, a plurality of submerged membrane units 4 are provided in the biological treatment tank 1 so as to stand in the casing 6 and have a plurality of filtration membrane modules 5 arranged side by side in the horizontal direction. Although installed, the number of filtration membrane modules 5 installed side by side, the number of submerged membrane units 4 installed, the amount of permeated liquid withdrawn, etc. are determined by the amount of raw water to be treated, the properties and the concentration of nitrogen compounds. It
【００２１】以下に前記構成の生物学的脱窒処理装置の
作用について述べる。生物処理槽１に浸漬配置された浸
漬膜ユニット４内の硝化部２から、散気手段７から散気
される気体のエアリフト効果による水頭差で、ケ−シン
グ６上部の硝化液流出口１１を経て浸漬膜ユニット４外
の脱窒部３に循環された硝化液は、攪拌機１６で攪拌さ
れて脱窒部３に供給された原水と混合され、原水中の有
機物が、脱窒菌などの通性嫌気性菌の生物活性維持のた
めの炭素源及び水素供与体として利用され、硝酸態や亜
硝酸態などの窒素酸化物が還元分解され窒素ガスとして
排出される。The operation of the biological denitrification treatment apparatus having the above construction will be described below. From the nitrification section 2 in the submerged membrane unit 4 immersed in the biological treatment tank 1, the nitrification solution outlet 11 in the upper part of the casing 6 is caused by the head difference due to the air lift effect of the gas diffused from the diffuser 7. The nitrification liquid circulated through the denitrification unit 3 outside the immersion membrane unit 4 is mixed with the raw water supplied to the denitrification unit 3 after being agitated by the stirrer 16, and the organic matter in the raw water is permeable to denitrifying bacteria and the like. It is used as a carbon source and hydrogen donor for maintaining the biological activity of anaerobic bacteria, and nitrogen oxides such as nitrate and nitrite are reduced and decomposed and discharged as nitrogen gas.
【００２２】前記処理における全汚泥濃度は高負荷運転
のために、５，０００〜３０，０００ｍｇ／ｌが好まし
く、更に好ましくは、１０，０００〜２０，０００ｍｇ
／ｌであり、また前記脱窒処理において、脱窒部３にお
けるＮＯ3 −Ｎ容積負荷は、０．５〜２ｋｇＮ／ｍ3 ・
日、硝化部２におけるＮＨ4 −Ｎ容積負荷は、通常０．
２〜０．５ｋｇＮ／ｍ3 ・日で運転され、更に硝化液の
循環量や散気する気体の供給量は、処理する有機性廃水
の性状やＮ、ＢＯＤ容積負荷などにより適宜に制御され
る。The total sludge concentration in the above treatment is preferably 5,000 to 30,000 mg / l, more preferably 10,000 to 20,000 mg for high load operation.
/ L, and in the denitrification treatment, the NO 3 -N volume load in the denitrification section 3 is 0.5 to 2 kgN / m 3 ·
The NH 4 -N volumetric load in the nitrification section 2 is usually 0.
It is operated at 2 to 0.5 kgN / m 3 · day, and the circulation amount of nitrification liquid and the supply amount of diffused gas are appropriately controlled depending on the properties of the organic wastewater to be treated, N, and BOD volume load. .
【００２３】脱窒処理された脱窒液は、脱窒部３からケ
−シング６下部の脱窒液流入口１０を経て硝化部２に供
給され、気体供給ブロワ８から散気手段７を経て散気さ
れる酸素含有気体による好気性雰囲気で、残余の有機物
及び窒素化合物が硝化菌などの好気性菌の生物学的作用
で酸化分解されると共に、アンモニアなどの窒素化合物
が硝酸態や亜硝酸態などの窒素酸化物に酸化される。The denitrification solution subjected to the denitrification is supplied from the denitrification section 3 to the nitrification section 2 through the denitrification solution inlet 10 at the bottom of the casing 6, and from the gas supply blower 8 through the aeration means 7. In an aerobic atmosphere with diffused oxygen-containing gas, residual organic substances and nitrogen compounds are oxidatively decomposed by the biological action of aerobic bacteria such as nitrifying bacteria, and nitrogen compounds such as ammonia are converted into nitric acid and nitrite. Oxidized into nitrogen oxides in various states.
【００２４】また、硝化部２に供給された脱窒液は、散
気手段７から散気される気体によるエアリフト効果によ
り、濾過膜モジュ−ル５間を上向流通する間に固液分離
され、膜透過液は透過液の排出流路１３から透過液抜き
出しポンプ９により処理水として系外に排出されるが、
透過液抜き出しポンプ９による吸引圧は通常−１，００
０〜−３，０００ｍｍＡｑに制御される。The denitrification liquid supplied to the nitrification unit 2 is solid-liquid separated while flowing upward between the filtration membrane modules 5 due to the air lift effect of the gas diffused from the diffuser 7. The membrane permeate is discharged out of the system as treated water by the permeate extraction pump 9 from the permeate discharge channel 13.
The suction pressure by the permeate extraction pump 9 is usually -1,000.
It is controlled to 0 to 3,000 mmAq.
【００２５】従って、前記硝化部２では、単一の散気手
段７で好気性雰囲気の維持と濾過膜表面の洗浄が行わ
れ、また濾過膜モジュ−ル５で固液分離されるため、汚
泥を沈降分離する沈殿槽が不要となり、更に汚泥は硝化
部２に滞留され微生物濃度が高く保持されることにより
高負荷運転による効率的な硝化処理が行われるため、設
備費や動力費が低減される。Therefore, in the nitrification section 2, the single aeration means 7 maintains the aerobic atmosphere and cleans the surface of the filtration membrane, and the filtration membrane module 5 separates solid and liquid, so that the sludge is sludged. A sedimentation tank for settling and separating the sludge is not required, and the sludge is retained in the nitrification section 2 to maintain a high microbial concentration, which enables efficient nitrification treatment under high load operation, reducing equipment costs and power costs. It
【００２６】また、従来は硝化槽から原水の３〜６倍の
硝化液を循環流路及びポンプを用いて脱窒槽に循環して
いたため、動力費などが嵩んでいたが、本発明の実施形
態の生物学的脱窒処理装置では、硝化液の脱窒部３への
循環がエアリフト効果による水頭差で行われているた
め、更に動力費などの低廉化が図られる。Further, conventionally, the nitrification solution which is 3 to 6 times as much as the raw water was circulated from the nitrification tank to the denitrification tank by using the circulation flow path and the pump, so that the power cost was increased, but the embodiment of the present invention In the biological denitrification treatment apparatus, the nitrification liquid is circulated to the denitrification section 3 by the head difference due to the air lift effect, so that the power cost and the like can be further reduced.
【００２７】[0027]
【発明の効果】本発明は、有機性廃水中の窒素化合物を
除去する循環脱窒処理装置において、生物処理槽内に固
液分離用の濾過膜モジュ−ルを具備した浸漬膜ユニット
を浸漬して硝化部と脱窒部とを設け、微生物濃度を高く
保持して高負荷運転による効率的な脱窒処理を可能とす
ると共に、好気性雰囲気を維持する散気手段と濾過膜表
面を洗浄する散気手段を単一化し、また硝化液の循環を
循環ポンプを用いずにエアリフト効果による水頭差で行
い、更に汚泥を沈降分離する沈殿槽を不要とすることが
でき、従来の生物学的脱窒処理装置に比較して設備費や
動力費をより一層低減することができる。INDUSTRIAL APPLICABILITY According to the present invention, in a circulating denitrification treatment apparatus for removing nitrogen compounds in organic wastewater, an immersion membrane unit equipped with a filtration membrane module for solid-liquid separation is immersed in a biological treatment tank. A nitrification section and a denitrification section are provided to maintain a high microbial concentration to enable efficient denitrification processing under high load operation, and to clean the aeration means and the filtration membrane surface that maintain an aerobic atmosphere. A single aeration means is used, and the nitrification solution is circulated by a water head difference due to the air lift effect without using a circulation pump. The equipment cost and power cost can be further reduced as compared with the nitrogen treatment device.
【図１】本発明の一実施の形態の生物学的脱窒処理装置
の概略縦断面図FIG. 1 is a schematic vertical sectional view of a biological denitrification treatment apparatus according to an embodiment of the present invention.
【図２】図１の概略平面図FIG. 2 is a schematic plan view of FIG.
１：生物処理槽 ２：硝化部 ３：脱窒部 ４：浸漬膜ユニット ５：濾過膜モジュ−ル ６：ケ−シング ７：散気手段 ８：気体供給ブロワ ９：透過液抜き出しポンプ９ １０：脱窒液流入口 １１：硝化液流出口 １２：原水供給流路 １３：透過液の排出流路 １５：汚泥抜き出し流路 １６：攪拌機 1: Biological treatment tank 2: Nitrification part 3: Denitrification part 4: Immersion membrane unit 5: Filtration membrane module 6: Casing 7: Aeration means 8: Gas supply blower 9: Permeate extraction pump 9 10: Denitrification liquid inflow port 11: Nitrification liquid outflow port 12: Raw water supply flow path 13: Permeate discharge flow path 15: Sludge extraction flow path 16: Stirrer
Claims (1)
を具備し、上端面が開放されたケ−シング内に複数の濾
過膜モジュ−ルを立設して水平方向に並設し、濾過膜モ
ジュ−ルの下方に散気手段を配置して成る浸漬膜ユニッ
トを生物処理槽内に浸漬配置し、前記生物処理槽の浸漬
膜ユニット内を硝化部、浸漬膜ユニット外を脱窒部と
し、前記散気手段による気体のエアリフト効果で硝化部
と脱窒部との液循環を行うことを特徴とする生物学的脱
窒処理装置。1. A denitrifying liquid inlet at a lower portion and a nitrifying liquid outlet at an upper portion, and a plurality of filtration membrane modules are installed upright in a casing having an open upper end surface and arranged in a horizontal direction. The submerged membrane unit, which is provided with air diffusing means below the filtration membrane module, is submerged in the biological treatment tank, and the inside of the submerged membrane unit of the biological treatment tank is connected to the nitrification section and the outside of the submerged membrane unit. A biological denitrification treatment device comprising a denitrification section, wherein liquid circulation between the nitrification section and the denitrification section is performed by an air lift effect of gas by the aeration means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7300413A JPH09117794A (en) | 1995-10-26 | 1995-10-26 | Biological denitrification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7300413A JPH09117794A (en) | 1995-10-26 | 1995-10-26 | Biological denitrification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09117794A true JPH09117794A (en) | 1997-05-06 |
Family
ID=17884511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7300413A Pending JPH09117794A (en) | 1995-10-26 | 1995-10-26 | Biological denitrification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09117794A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004243248A (en) * | 2003-02-14 | 2004-09-02 | Hitachi Plant Eng & Constr Co Ltd | Nitrogen removal equipment |
| JP2007275895A (en) * | 2007-07-30 | 2007-10-25 | Hitachi Plant Technologies Ltd | Nitrogen removal method and apparatus in membrane separation type oxidation ditch |
| JP2010264435A (en) * | 2009-05-15 | 2010-11-25 | Shenzhen Jdl Environmental Protection Ltd | Method for the formation of facultative bio-adaptive membrane bioreactors |
| JP2011522700A (en) * | 2008-06-09 | 2011-08-04 | ヴェオリア・ウォーター・ソリューションズ・アンド・テクノロジーズ・サポート | Water treatment method and system using membrane filtering system |
| JP2018043214A (en) * | 2016-09-16 | 2018-03-22 | 株式会社クボタ | Sewage treatment equipment and method |
| WO2018096583A1 (en) * | 2016-11-22 | 2018-05-31 | 日本アルシー株式会社 | Microorganism reaction vessel and method for treating wastewater |
| CN111533248A (en) * | 2020-04-20 | 2020-08-14 | 中麒赋能水务科技股份有限公司 | Synchronous built-in denitrification system |
-
1995
- 1995-10-26 JP JP7300413A patent/JPH09117794A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004243248A (en) * | 2003-02-14 | 2004-09-02 | Hitachi Plant Eng & Constr Co Ltd | Nitrogen removal equipment |
| JP2007275895A (en) * | 2007-07-30 | 2007-10-25 | Hitachi Plant Technologies Ltd | Nitrogen removal method and apparatus in membrane separation type oxidation ditch |
| JP2011522700A (en) * | 2008-06-09 | 2011-08-04 | ヴェオリア・ウォーター・ソリューションズ・アンド・テクノロジーズ・サポート | Water treatment method and system using membrane filtering system |
| JP2010264435A (en) * | 2009-05-15 | 2010-11-25 | Shenzhen Jdl Environmental Protection Ltd | Method for the formation of facultative bio-adaptive membrane bioreactors |
| JP2018043214A (en) * | 2016-09-16 | 2018-03-22 | 株式会社クボタ | Sewage treatment equipment and method |
| WO2018096583A1 (en) * | 2016-11-22 | 2018-05-31 | 日本アルシー株式会社 | Microorganism reaction vessel and method for treating wastewater |
| CN111533248A (en) * | 2020-04-20 | 2020-08-14 | 中麒赋能水务科技股份有限公司 | Synchronous built-in denitrification system |
| CN111533248B (en) * | 2020-04-20 | 2021-08-24 | 扶志远 | Synchronous built-in denitrification system |
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