JPH0148836B2 - - Google Patents
Info
- Publication number
- JPH0148836B2 JPH0148836B2 JP4217484A JP4217484A JPH0148836B2 JP H0148836 B2 JPH0148836 B2 JP H0148836B2 JP 4217484 A JP4217484 A JP 4217484A JP 4217484 A JP4217484 A JP 4217484A JP H0148836 B2 JPH0148836 B2 JP H0148836B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- heat
- treated
- treatment
- heat treatment
- 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 claims description 57
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 19
- 239000004927 clay Substances 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 22
- 239000000126 substance Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004021 humic acid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Description
本発明は、下水や廃水の処理によつて発生した
汚泥を調質するための、汚泥の熱処理方法に関す
るものである。
一般に下水や廃水の処理によつて発生した汚泥
は、いつたん汚泥貯溜槽に貯溜した後、熱交換器
で予熱して反応器に供給し、反応器内に吹込んだ
蒸気によつて加温すると共に、反応器内に吹込ん
だ圧縮空気によつて加圧し、熱処理反応によつて
汚泥の沈降分離性および脱水性を改善すると共
に、悪臭成分をも酸化分解するようにしている。
ところが、反応温度が200℃程度の高温熱処理
を行うと、汚泥から高濃度の有機物が溶出して液
側に移行し、これが熱処理分離液として排出され
るため、その熱処理分離液を活性汚泥法で処理し
にくいという欠点があつた。そこで最近では、反
応温度を下げて165℃程度の低温熱処理を行い、
熱処理分離液中の有機物濃度の低減化を図ること
も行われているが、熱処理分離液にはフミン酸や
フルボ酸類似物質等の難分解性物質が溶出成分と
して含まれているため高い色度を有し、これを活
性汚泥法で処理するには、ばつ気処理のために多
量の吹込み空気量を必要とし、処理コストが高く
なるという欠点があつた。
本発明は、上記従来の欠点に鑑みて提案された
もので、予熱された汚泥が供給される反応器内に
蒸気と圧縮空気を吹込んで汚泥の調質を行うよう
にした汚泥の熱処理方法において、汚泥の熱処理
反応時に活性白土を添加すると共に、反応温度が
110℃〜165℃となるようにしたことを特徴とする
ものである。
本発明の汚泥の熱処理方法によれば、汚泥から
溶出した難分解性物質を、汚泥の熱処理反応時に
添加した活性白土に吸着させて汚泥と共に排出さ
せることができるから、熱処理分離液の色度を低
下させることができる。また、熱処理分離液を単
独で処理し、水処理系に返送するに際し、単独で
活性汚泥処理をするとき、ばつ気処理のために必
要とする吹込み空気量を著しく低減することがで
きるから、処理コストを大巾に削減することがで
き、また水処理系への返送負荷を低減できる等多
くの利点が生じ、下水や廃水の処理によつて発生
した汚泥を調質する上で、きわめて有効である。
以下、本発明の実施例を図面を参照して具体的
に説明する。
図面は本発明の汚泥の熱処理方法の１実施例を
示す工程図である。
図中１は汚泥貯溜槽で、下水や廃水の処理によ
つて発生した汚泥２は、いつたん汚泥貯溜槽１に
貯溜された後、ポンプ３により熱交換器４に供給
され、ここで予熱された後反応器５の下部に供給
され反応器５に供給された汚泥２は、反応器５の
下部に吹込まれている蒸気６によつて165℃程度
まで加温されるとともに、反応器５の下部に吹込
まれている10Kg／cm2程度の圧縮空気７によつて加
圧され、反応器５内で低温熱処理されるが、反応
器５内には別に活性白土８が供給され、汚泥２の
熱処理反応時に添加されるようになつている。反
応器５から排出される排ガス９は、図示しないス
クラバーに導かれて除湿冷却された後、脱臭塔へ
送られて脱臭処理されることになる。反応器５で
低温熱処理された汚泥２は熱交換器４に導かれて
熱回収され、常温まで冷却されて濃縮槽１１に送
られる。濃縮槽１１において沈降分離された汚泥
２は、フイルタープレス１２により脱水処理さ
れ、また、濃縮槽１１において汚泥２と分離され
た熱処理分離液１０は、図示しない循環式長時間
ばつ気処理槽において活性汚泥処理され、その後
水処理系に返送される。
上記工程よりなる本発明の汚泥の熱処理方法に
おいては、汚泥は低温熱処理されるので、汚泥か
ら高濃度の有機物の溶出は最小限に軽減される。
また、汚泥から溶出したフミン酸やフルボ酸類似
物質等の難分解性物質は、汚泥の熱処理反応時に
添加される活性白土に吸着されるから、熱処理分
離液の色度を低下させることができる。そして、
熱処理分離液には難分解性物質が低減されている
ので、熱処理分離液をばつ気処理するために必要
とする吹込み空気量を著しく低減することがで
き、活性汚泥の処理コストを大巾に削減すること
ができる。
次に、上記工程よりなる本発明の汚泥の熱処理
方法の有効性を確認するために、汚泥の熱処理反
応時に活性白土を添加しない場合と、添加した場
合における熱処理分離液の性状と、その熱処理分
離液を循環式長時間ばつ気処理した処理水の性状
を分析したところ、次表に示すような分析結果を
得ることができる。
表―は活性白土を添加しないで汚泥を反応温
度165℃程度で従来の熱処理をした場合の熱処理
分離液と、その熱処理分離液を循環式長時間ばつ
気処理した処理水の分析値を示し、ばつ気処理に
要した吹込み空気量は、熱処理分離液１m3当り略
320Nm3であつた。
The present invention relates to a sludge heat treatment method for refining sludge generated in the treatment of sewage and wastewater. Generally, sludge generated from the treatment of sewage and wastewater is stored in a sludge storage tank, then preheated with a heat exchanger, supplied to a reactor, and heated by steam blown into the reactor. At the same time, the reactor is pressurized by compressed air blown into the reactor, and a heat treatment reaction improves the settling and dewatering properties of the sludge, and also oxidizes and decomposes malodorous components. However, when high-temperature heat treatment is performed at a reaction temperature of approximately 200°C, a high concentration of organic matter is eluted from the sludge and transferred to the liquid side, which is discharged as heat-treated separated liquid. The drawback was that it was difficult to process. Therefore, recently, we have lowered the reaction temperature and performed low-temperature heat treatment at around 165℃.
Efforts have been made to reduce the concentration of organic matter in the heat-treated separated liquid, but the heat-treated separated liquid contains difficult-to-decompose substances such as humic acid and fulvic acid-like substances as eluted components, resulting in high chromaticity. To treat this using the activated sludge method, a large amount of blown air is required for aeration treatment, which has the drawback of increasing treatment costs. The present invention was proposed in view of the above-mentioned conventional drawbacks, and provides a sludge heat treatment method in which sludge is tempered by blowing steam and compressed air into a reactor into which preheated sludge is supplied. , activated clay was added during the heat treatment reaction of sludge, and the reaction temperature was increased.
It is characterized in that the temperature is 110°C to 165°C. According to the sludge heat treatment method of the present invention, the refractory substances eluted from the sludge can be adsorbed to the activated clay added during the sludge heat treatment reaction and can be discharged together with the sludge. can be lowered. In addition, when the heat-treated separated liquid is treated alone and returned to the water treatment system, the amount of blown air required for aeration treatment can be significantly reduced when activated sludge treatment is performed alone. It has many advantages such as greatly reducing treatment costs and reducing the return load to the water treatment system, making it extremely effective in refining sludge generated from sewage and wastewater treatment. It is. Embodiments of the present invention will be specifically described below with reference to the drawings. The drawings are process diagrams showing one embodiment of the sludge heat treatment method of the present invention. In the figure, 1 is a sludge storage tank, and sludge 2 generated during the treatment of sewage and wastewater is stored in the sludge storage tank 1 and then supplied to a heat exchanger 4 by a pump 3, where it is preheated. The sludge 2 supplied to the lower part of the reactor 5 is heated to about 165°C by the steam 6 blown into the lower part of the reactor 5, and It is pressurized by compressed air 7 of about 10 kg/cm 2 blown into the lower part, and is subjected to low-temperature heat treatment in the reactor 5. Activated clay 8 is separately supplied to the reactor 5, and the sludge 2 is It is now added during the heat treatment reaction. The exhaust gas 9 discharged from the reactor 5 is guided to a scrubber (not shown), dehumidified and cooled, and then sent to a deodorizing tower where it is deodorized. The sludge 2 subjected to low-temperature heat treatment in the reactor 5 is led to a heat exchanger 4 where heat is recovered, cooled to room temperature, and sent to a thickening tank 11. The sludge 2 that has been sedimented and separated in the thickening tank 11 is dehydrated in the filter press 12, and the heat-treated separated liquid 10 that has been separated from the sludge 2 in the thickening tank 11 is activated in a circulation type long-duration air treatment tank (not shown). The sludge is treated and then returned to the water treatment system. In the sludge heat treatment method of the present invention comprising the above steps, the sludge is subjected to low-temperature heat treatment, so that the elution of high-concentration organic matter from the sludge is minimized.
In addition, since persistent substances such as humic acid and fulvic acid-like substances eluted from the sludge are adsorbed by the activated clay added during the heat treatment reaction of the sludge, the chromaticity of the heat-treated separated liquid can be reduced. and,
Since the heat-treated separated liquid contains fewer persistent substances, the amount of air required to aerate the heat-treated separated liquid can be significantly reduced, significantly reducing activated sludge treatment costs. can be reduced. Next, in order to confirm the effectiveness of the sludge heat treatment method of the present invention consisting of the above steps, we will examine the properties of the heat-treated separated liquid and the heat-treated separated liquid when activated clay is not added and when activated clay is added during the sludge heat treatment reaction. When we analyzed the properties of the treated water, which was subjected to long-term air circulation treatment, we obtained the results shown in the table below. The table shows the analytical values of the heat-treated separated liquid obtained when sludge was conventionally heat-treated at a reaction temperature of about 165°C without the addition of activated clay, and the treated water obtained by circulating and aerating the heat-treated separated liquid for a long time. The amount of blown air required for aeration treatment is approximately per m3 of heat-treated separated liquid.
It was 320Nm3 .
【表】
表―は活性白土を10％（重量）添加して汚泥
を反応温度165℃程度で本発明の方法により熱処
理した場合の熱処理分離液と、その熱処理分離液
を循環式長時間ばつ気処理した処理水の分析値を
示し、ばつ気処理に要した吹込み空気量は、熱処
理分離液１m3当り略96Nm3であつた。[Table] The table shows the heat-treated separated liquid obtained by adding 10% (weight) of activated clay and heat-treating the sludge using the method of the present invention at a reaction temperature of about 165°C, and the heat-treated separated liquid heated in a circulating type long-term heat treatment. The analytical values of the treated water are shown, and the amount of air blown required for the aeration treatment was approximately 96 Nm 3 per 1 m 3 of heat-treated separated liquid.
【表】
この分析値から明らかなように、汚泥の熱処理
反応時に活性白土を添加すると、活性白土を添加
しない場合と比較して熱処理分離液のSSや
BOD、CODMo、Ｔ―Ｎ（トータル窒素）、Ｔ―Ｐ
（トータルリン）の濃度及び色度はいずれも大巾
に低減しており、熱処理によつて汚泥から溶出し
た難分解性物質等が活性白土に効果的に吸着して
除去されたことが解る。
このように、本発明の汚泥の熱処理方法によれ
ば、熱処理分離液には難分解性物質が低減されて
いるので、熱処理分離液をばつ気処理するに要す
る吹込み空気量は従来の約1/3となり、活性汚泥
の処理コストを大巾に削減することができること
になる。
なお、本発明の方法によつて熱処理された汚泥
の脱水性は、比抵抗で107〜108（sec2／ｇ）のオ
ーダーにあり、反応温度が110℃〜165℃の範囲内
であれば、汚泥の熱処理反応時に活性白土又はそ
の類似物質を添加する効果が十分にあることが解
つた。又添加する活性白土の量は、熱処理する汚
泥に対し、５〜10％（重量）程度の小量で十分で
あつた。
以上説明したように、本発明によれば、汚泥を
熱処理してできる熱処理分離液を活性汚泥法で容
易に処理することができ、その処理コストを大巾
に削減することができる等大きな利点を有し、下
水や廃水の処理によつて発生した汚泥を調質する
上できわめて有効な汚泥の熱処理方法を提供し得
るものである。[Table] As is clear from this analytical value, when activated clay is added during the heat treatment reaction of sludge, the SS of the heat-treated separated liquid is
BOD, COD Mo , TN (total nitrogen), T-P
Both the concentration and chromaticity of (total phosphorus) were significantly reduced, indicating that the refractory substances eluted from the sludge by the heat treatment were effectively adsorbed to the activated clay and removed. As described above, according to the sludge heat treatment method of the present invention, the amount of refractory substances in the heat-treated separated liquid is reduced, so the amount of blown air required to aerate the heat-treated separated liquid is approximately 1 /3, which means that activated sludge treatment costs can be significantly reduced. The dewaterability of the sludge heat-treated by the method of the present invention is on the order of 10 7 to 10 8 (sec 2 /g) in terms of specific resistance, and the dewaterability of the sludge heat-treated by the method of the present invention is on the order of 10 7 to 10 8 (sec 2 /g), even if the reaction temperature is within the range of 110°C to 165°C. For example, it has been found that the addition of activated clay or similar substances during the heat treatment reaction of sludge is sufficiently effective. Furthermore, the amount of activated clay added was sufficient to be as small as 5 to 10% (by weight) of the sludge to be heat treated. As explained above, according to the present invention, the heat-treated separated liquid produced by heat-treating sludge can be easily treated by the activated sludge method, and there are great advantages such as the ability to drastically reduce the treatment cost. It is possible to provide a heat treatment method for sludge that is extremely effective in refining sludge generated in the treatment of sewage and wastewater.
図面は本発明の汚泥の熱処理方法の１実施例を
示す工程図である。
１……汚泥貯溜槽、２……汚泥、３……ポン
プ、４……熱交換器、５……反応器、６……蒸
気、７……圧縮空気、８……活性白土、９……排
ガス、１０……熱処理分離液、１１……濃縮槽、
１２……フイルタープレス。
The drawings are process diagrams showing one embodiment of the sludge heat treatment method of the present invention. 1... Sludge storage tank, 2... Sludge, 3... Pump, 4... Heat exchanger, 5... Reactor, 6... Steam, 7... Compressed air, 8... Activated clay, 9... Exhaust gas, 10...Heat-treated separated liquid, 11...Concentration tank,
12...Filter press.
Claims (1)
と圧縮空気を吹込んで汚泥の調質を行うようにし
た汚泥の熱処理方法において、汚泥の熱処理反応
時に、活性白土を添加すると共に、反応温度が
110℃〜165℃となるようにしたことを特徴とする
汚泥の熱処理方法。1 In a sludge heat treatment method in which sludge is tempered by blowing steam and compressed air into a reactor into which preheated sludge is supplied, activated clay is added during the sludge heat treatment reaction, and the reaction temperature is but
A method for heat treatment of sludge, characterized in that the temperature is 110°C to 165°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4217484A JPS60187399A (en) | 1984-03-07 | 1984-03-07 | Sludge heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4217484A JPS60187399A (en) | 1984-03-07 | 1984-03-07 | Sludge heat treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187399A JPS60187399A (en) | 1985-09-24 |
| JPH0148836B2 true JPH0148836B2 (en) | 1989-10-20 |
Family
ID=12628608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4217484A Granted JPS60187399A (en) | 1984-03-07 | 1984-03-07 | Sludge heat treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60187399A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100767810B1 (en) | 2007-06-15 | 2007-10-18 | 주식회사 나노엔텍 | Sludge Treatment |
| CN104003593B (en) * | 2014-06-14 | 2016-05-04 | 济南米铎碳新能源科技有限公司 | Sludge harmless treatment method |
| CN111774009A (en) * | 2020-07-14 | 2020-10-16 | 西安交通大学 | A kind of hydrothermal dehydration treatment reaction device of high water content organic matter and its operation method |
-
1984
- 1984-03-07 JP JP4217484A patent/JPS60187399A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187399A (en) | 1985-09-24 |
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