JPS603877B2 - Sludge treatment method - Google Patents
Sludge treatment methodInfo
- Publication number
- JPS603877B2 JPS603877B2 JP56144311A JP14431181A JPS603877B2 JP S603877 B2 JPS603877 B2 JP S603877B2 JP 56144311 A JP56144311 A JP 56144311A JP 14431181 A JP14431181 A JP 14431181A JP S603877 B2 JPS603877 B2 JP S603877B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- heat treatment
- tank
- treatment
- settling tank
- 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.)
- Expired
Links
- 239000010802 sludge Substances 0.000 title claims description 50
- 238000000034 method Methods 0.000 title claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 238000005273 aeration Methods 0.000 claims description 7
- 239000010865 sewage Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 description 9
- 238000000855 fermentation Methods 0.000 description 7
- 230000004151 fermentation Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 230000029087 digestion Effects 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】
本発明は有機質汚水を活性汚泥法で処理した際に生成す
る最終沈殿池からの余剰汚泥を好気性熱処理した後〆タ
ン発酵処理を行う汚泥処理法の改良法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved sludge treatment method in which excess sludge from the final settling tank produced when organic sewage is treated by the activated sludge method is subjected to aerobic heat treatment and then sludge fermentation treatment. It is.
第１図は従来から使用されている汚泥処理法の１例を示
す工程図である。FIG. 1 is a process diagram showing one example of a conventionally used sludge treatment method.
汚水１は最初沈殿池２に導かれ、生汚泥３を分離した後
、ェアレーションタンク４に流入し、鰻気のもとに、好
気性微生物により、含有有機物を分解された後、最終沈
殿池５に入り、いわゆる余剰汚泥６を分離し、残部汚泥
はェアレーションタンク４にフィードバックされる。Sewage 1 is first led to a settling tank 2, and after separating raw sludge 3, it flows into an aeration tank 4, where the organic matter contained is decomposed by aerobic microorganisms under eel air, and then the final sedimentation is carried out. The sludge enters the pond 5, where so-called surplus sludge 6 is separated, and the remaining sludge is fed back to the aeration tank 4.
最終沈殿池５で分離された上記余剰汚泥６は、実質的に
好気性菌体の集合であるが、熱処理装置７において、例
えば１７ｙｏ（ケージ圧８ｋ９／地）に約３０分保持さ
れ、メタン発酵し易い基質になる。The surplus sludge 6 separated in the final settling tank 5 is substantially a collection of aerobic bacterial cells, but is kept at a temperature of, for example, 17yo (cage pressure 8k9/ground) for about 30 minutes in a heat treatment device 7, and is then subjected to methane fermentation. It becomes an easy substrate.
この汚泥に、最初沈殿池２から分離された生汚泥３を混
合し、嫌気性消化タンク８（以下消化タンクという。）
に投入すれば、嫌気性菌によって分解し、低位発熱量５
５０皿ｃａｌ／Ｎの程度のメタン含有ガスと、消化汚泥
、脱離液とに分離される。消化タンク８で発生したメタ
ン含有ガスは、ガスタンク９に貯えられ、蒸気ボイラー
１０の燃料に使用される。蒸気ボイラー１０で発生した
水蒸気は熱処理装置７の熱源またはその他の設備に用い
られる。上記した従来の汚泥処理法は、メタン発酵が極
めて困難である余剰汚泥を、熱処理により、メタン発酵
し易い基質に変え得るため、メタンガス発生量が非常に
多い（熱処理を行わぬ場合の１．５〜２倍量）ので、省
エネルギーの立場から優れた方法と言える。The raw sludge 3 separated from the initial settling tank 2 is mixed with this sludge, and an anaerobic digestion tank 8 (hereinafter referred to as the digestion tank) is mixed.
If put into the water, it will be decomposed by anaerobic bacteria and the lower calorific value
It is separated into methane-containing gas of about 50 cal/N, digested sludge, and desorbed liquid. Methane-containing gas generated in the digestion tank 8 is stored in a gas tank 9 and used as fuel for the steam boiler 10. The steam generated in the steam boiler 10 is used as a heat source for the heat treatment device 7 or other equipment. In the conventional sludge treatment method described above, the amount of methane gas generated is extremely large (1.5 ~2 times the amount), so it can be said to be an excellent method from the standpoint of energy conservation.
しかしながら、上記方法は、余剰汚泥６を嫌気性菌によ
り分解し易くするための方法として、約１７５ｑｏ（ゲ
ージ圧８ｋ９／地）なる苛酷な作業条件の熱処理工程を
含んでいる点で問題がある。However, the above method has a problem in that it includes a heat treatment step under harsh working conditions of about 175 qo (gauge pressure 8 k9/ground) to make the surplus sludge 6 easier to decompose by anaerobic bacteria.
すなわち、高温加圧下の処理であるため、耐圧、耐摩耗
、耐腐食対策として、高級な材料を多量使用しなければ
ならず、また、加圧のため、かなりの動力を必要とし、
かつ、ポンプ弁などの故障、漏洩も多く、その運転に高
級技術者を必要とし、さらに、保全検査のため設備を止
める必要があり稼動率が低下するのである。In other words, since the process is carried out under high temperature and pressure, a large amount of high-grade materials must be used to withstand pressure, wear and corrosion, and a considerable amount of power is required to pressurize.
In addition, there are many failures and leaks in pump valves, etc., and high-level engineers are required to operate them.Furthermore, it is necessary to shut down the equipment for maintenance inspections, which reduces the operating rate.
本発明者らは、上託した苛酷な熱処理条件を緩和する目
的をもって、種種研究を重ねた結果、空気による曝気を
行いながら、熱処理を行えば、処理温度を１００〜１２
０ｑｏに下げ得ることを見いだし、本発明を完成したの
である。The inventors of the present invention have repeatedly conducted various studies with the aim of easing the harsh heat treatment conditions entrusted to them, and have found that if heat treatment is performed while aeration is performed, the treatment temperature can be increased to 100 to 120℃.
They discovered that it was possible to lower the qo to 0qo, and completed the present invention.
次に、実験結果により本発明の技術的意味を具体的に説
明する。Next, the technical meaning of the present invention will be specifically explained using experimental results.
本発明においては、余剰汚泥のみを好気性熱処理を行い
、生汚泥については熱処理を行わないが、この結論は、
例えば第２図に示した実験結果の１例により得られるも
のである。In the present invention, only surplus sludge is subjected to aerobic heat treatment, and raw sludge is not heat treated.
For example, this can be obtained from one example of the experimental results shown in FIG.
先づ、実験方法を説明する。First, the experimental method will be explained.
試料として、分流式下水処理場の生汚泥および余剰汚泥
を沈降濃縮した全固形物濃度、それぞれ３．８〜４．０
重量％（有機物濃度２．７〜３．０重量％）、２．８〜
３．４重量％（有機物濃度２．０〜２．５重量％）のも
のを用いた。As samples, raw sludge and surplus sludge from a separate sewage treatment plant were sedimented and concentrated, and the total solids concentration was 3.8 to 4.0, respectively.
Weight% (organic concentration 2.7-3.0% by weight), 2.8-
3.4% by weight (organic substance concentration 2.0 to 2.5% by weight) was used.
熱処理条件としては、生汚泥については、熱処理を行わ
ないでもメタン発酵による分解率が充分高いが、嫌気性
、好気性の熱処理をいずれも、２０℃、６０ｑｏ、１０
０ｑｏ、１２０ｑｏ、１６０ｑｏにおいて行い（２００
０の場合は実質的に無処理に該当する。Regarding the heat treatment conditions, raw sludge has a sufficiently high decomposition rate through methane fermentation even without heat treatment, but both anaerobic and aerobic heat treatment were performed at 20°C, 60qo, 10
Performed at 0qo, 120qo, 160qo (200qo
A value of 0 corresponds to substantially no processing.
）、余剰汚泥については、嫌気性および好気性の熱処理
を、それぞれ、３０００、６０午○、８０３０、１０ぴ
Ｃ、１２０℃、１４０℃、１７５ｑｏにおいて、生汚泥
、余剰汚泥を問わず、熱処理温度に３び分間保持した。
好気性熱処理の場合、空気をゲージ圧３ｋｇ／のになる
よう加えた。なお、嫌気性熱処理とは、空気（酸素）が
存在しない場合の熱処理であり、好気性熱処理とは、空
気（酸素）を存在させて行う熱処理を意味する。), surplus sludge was subjected to anaerobic and aerobic heat treatment at 3000, 60 pm, 8030, 10 pm, 120 ℃, 140 ℃, and 175 qo, respectively, regardless of raw sludge or surplus sludge. It was held for 3 minutes.
In the case of aerobic heat treatment, air was added to a gauge pressure of 3 kg/. Note that anaerobic heat treatment refers to heat treatment in the absence of air (oxygen), and aerobic heat treatment refers to heat treatment performed in the presence of air (oxygen).
消化方法としては、内容４そのガラス瓶に、技入汚泥と
して、生汚泥、余剰汚泥のいずれの場合にも、嫌気性ま
たは好気性熱処理をした汚泥１〆、熱処理をしない汚泥
１夕、種汚泥３〆を充分混合したものを用い、３５ｏ±
１℃に１３日間保持するバッチ法を用いた。As for the digestion method, put 4 in the glass bottle as technical sludge, whether raw sludge or surplus sludge, 1 quart of sludge that has been subjected to anaerobic or aerobic heat treatment, 1 ton of sludge that has not been heat treated, and 3 liters of seed sludge. 35o±
A batch method was used, holding at 1° C. for 13 days.
実験結果は、消化処理の間に発生するガス量および汚泥
の分析を基にして、メタン発酵による分解率（％）を示
した。実験結果の１部を、横軸に熱処理温度、竪軸にメ
タン発酵による分解率にとって、第２図に示す。The experimental results showed the decomposition rate (%) due to methane fermentation, based on the amount of gas generated during the digestion process and analysis of the sludge. A part of the experimental results is shown in FIG. 2, with the horizontal axis representing the heat treatment temperature and the vertical axis representing the decomposition rate due to methane fermentation.
図から明らかなように、（イ）生汚泥は、消化され易い
ので、熱処理をしないでも、分解率（竪軸値）は充分高
く、嫌気性、好気性を問わず、熱処理を必要としない。As is clear from the figure, (a) raw sludge is easily digested, so the decomposition rate (vertical axis value) is sufficiently high even without heat treatment, and heat treatment is not required regardless of whether it is anaerobic or aerobic.
（ロ）余剰汚泥の場合、好気性熱処理を行うと、嫌気性
熱処理に比べて、より低温で、熱処理の効果が現れ、１
００〜１２０ｑｏでほぼ最大値（分解率約６０％）にな
る。これに対し嫌気性熱処理の場合、１２０００ではじ
めて分解率ほぼ６０％に達し、さらに温度を上げると、
僅かに分解率が上昇して１７５午Ｃで約６４％の分解率
を示す。以上の知見に基づいた本発明の汚泥処理法は、
次のとおりである。有機汚水を、最初沈殿池、ヱアレー
ションタンク、最終沈殿池で順次処理し、最終沈殿池で
分離した余剰汚泥を、空気（酸素）の存在の下で、１０
０〜１２０午０で熱処理した後、最初沈殿池で分離した
生汚泥と混合し、この混合物をメタン発酵させ、メタン
ガスを発生させることを特徴とする汚泥処理方法。(b) In the case of surplus sludge, when aerobic heat treatment is performed, the effect of heat treatment appears at a lower temperature than anaerobic heat treatment, and 1
It reaches almost the maximum value (decomposition rate of about 60%) between 00 and 120 qo. In contrast, in the case of anaerobic heat treatment, the decomposition rate reaches approximately 60% only at 12,000 ℃, and when the temperature is further increased,
The decomposition rate increased slightly to about 64% at 175 pm. The sludge treatment method of the present invention based on the above findings is as follows:
It is as follows. Organic sewage was sequentially treated in a first sedimentation tank, an aeration tank, and a final sedimentation tank, and the excess sludge separated in the final sedimentation tank was treated in the presence of air (oxygen) for 10 minutes.
A sludge treatment method characterized in that after being heat treated at 0 to 120 o'clock, it is mixed with raw sludge separated in an initial settling tank, and this mixture is subjected to methane fermentation to generate methane gas.
すなわち、本発明では、僅か４％程度の分解率の向上を
蟻性にして、低温操業を選んだものであって、前記実験
ではゲージ圧を３ｋｇ／ので行った実験を例示したが、
この圧は１．５ｋ９′の低温の場合はさらにこれ以下に
も下げることが可能で、低温、低圧の作業を行うことが
でき、次に述べる種種の効果を奏するものである。That is, in the present invention, the decomposition rate was improved by only about 4%, and low-temperature operation was selected.
This pressure can be lowered even lower than this when the temperature is as low as 1.5k9', allowing work to be carried out at low temperatures and low pressures, providing the following various effects.
すなわち、活性汚泥処理装置で発生する生汚泥と余剰汚
泥のうち、余剰汚泥のみを空気（酸素）存在の下に１０
０〜１２０ｑｏ、比較的低圧で行うことにより、耐圧力
、耐腐食性の小さい軽量安価な熱処理装置を用いること
ができ、その他高圧を用いることに起因するトラブル例
えば、漏洩、弁摩耗などが減り、付属設備例え１ま、汚
泥ポンプの圧負荷が減少し、安価、低動力消費のものを
用いることができ、運転者の質、数を下げ得るなど、設
備費、補修費、運転費、労務費、全てにわたる効果があ
る。In other words, out of the raw sludge and surplus sludge generated in the activated sludge treatment equipment, only the surplus sludge is treated in the presence of air (oxygen) for 10 minutes.
By performing the treatment at a relatively low pressure of 0 to 120 qo, it is possible to use lightweight and inexpensive heat treatment equipment with low pressure resistance and corrosion resistance, and other problems caused by using high pressure, such as leakage and valve wear, are reduced. Ancillary equipment example 1: The pressure load on the sludge pump is reduced, cheaper and lower power consumption can be used, and the quality and number of operators can be reduced, which reduces equipment costs, repair costs, operating costs, and labor costs. , has an all-encompassing effect.
第１図は従来の汚泥処理法および本発明の汚泥法に共通
して使用できる汚泥処理工程図の１例である。
第２図は、生汚泥および余剰汚泥について、好気性熱処
理および嫌気性熱処理を行った場合のメタン発酵による
分解率と、熱処理温度との関係を示すグラフである。２
・・・・・・最初沈殿池、４・・・・・・ェアレーショ
ンタンク、５・・・…最終沈殿池、７・・・・・・熱処
理装置、８・・・・・・消化タンク、９・・・…ガスタ
ンク、１０・…・・蒸気ボイラー。
第１図
第２図FIG. 1 is an example of a sludge treatment process diagram that can be used in common with the conventional sludge treatment method and the sludge treatment method of the present invention. FIG. 2 is a graph showing the relationship between the decomposition rate by methane fermentation and the heat treatment temperature when raw sludge and surplus sludge are subjected to aerobic heat treatment and anaerobic heat treatment. 2
...First sedimentation tank, 4 ... Aeration tank, 5 ... Final sedimentation tank, 7 ... Heat treatment equipment, 8 ... Digestion tank , 9... Gas tank, 10... Steam boiler. Figure 1 Figure 2
Claims (1)
終沈殿池を用いて順次処理し、最終沈殿池で分離した余
剰汚泥を熱処理した後、最初沈殿池で分離した生汚泥と
混合し、この混合物をメタン発酵させ、メタン含有ガス
を発生させる工程を含む汚泥処理法において；前記熱処
理を、曝気しながら１００〜１２０℃で、行うことを特
徴とする汚泥処理法。1. Organic sewage is sequentially treated using an initial settling tank, an aeration tank, and a final settling tank, and the excess sludge separated in the final settling tank is heat-treated, and then mixed with the raw sludge separated in the first settling tank, and this mixture is A sludge treatment method comprising the step of methane-fermenting and generating methane-containing gas; the heat treatment is performed at 100 to 120° C. with aeration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56144311A JPS603877B2 (en) | 1981-09-11 | 1981-09-11 | Sludge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56144311A JPS603877B2 (en) | 1981-09-11 | 1981-09-11 | Sludge treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5845800A JPS5845800A (en) | 1983-03-17 |
| JPS603877B2 true JPS603877B2 (en) | 1985-01-31 |
Family
ID=15359131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56144311A Expired JPS603877B2 (en) | 1981-09-11 | 1981-09-11 | Sludge treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS603877B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6022996A (en) * | 1983-07-15 | 1985-02-05 | Kubota Ltd | Process for treating sludge |
| JPS6022995A (en) * | 1983-07-15 | 1985-02-05 | Kubota Ltd | Treating process for sludge |
| JPH01261626A (en) * | 1988-04-13 | 1989-10-18 | Tokyo Electron Ltd | Photographing device |
| CN105110590A (en) * | 2015-09-17 | 2015-12-02 | 昆明滇池水务股份有限公司 | Method and device for intensifying high-temperature hydrolysis acidification of excess sludge from sewage treatment plant through aeration |
-
1981
- 1981-09-11 JP JP56144311A patent/JPS603877B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5845800A (en) | 1983-03-17 |
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