CN103435240A - Fermentation and re-dewatering method of dewatered sludge - Google Patents
Fermentation and re-dewatering method of dewatered sludge Download PDFInfo
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- CN103435240A CN103435240A CN2013103319372A CN201310331937A CN103435240A CN 103435240 A CN103435240 A CN 103435240A CN 2013103319372 A CN2013103319372 A CN 2013103319372A CN 201310331937 A CN201310331937 A CN 201310331937A CN 103435240 A CN103435240 A CN 103435240A
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- 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
- Y02W10/20—Sludge processing
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Abstract
The invention discloses a deep dewatering method of sludge, which is characterized by comprising the steps of performing biological fermentation (anaerobic fermentation or aerobic fermentation) on the dewatered sludge for a certain period of time, allowing combined water in the sludge to be released, performing mechanical dewatering on the sludge after the fermentation, and obtaining the deeply dewatered sludge with a water content of approximately 60%.
Description
Technical field
The present invention relates to a kind of dewatering of sludge of sewage treatment plant, relate in particular to a kind of deep dehydration method for sludge.
Background technology
The mud of sewage work, as without suitable disposal, will produce serious secondary pollution.After the maximum difficult point of sludge disposal is sludge dewatering, still contain the moisture content of 80% left and right, and this part moisture content is difficult to method removal cheaply.Though at present multiple method of disposal is arranged, as heat drying, burning, compost etc., all, because of reasons such as cost of disposal, product marketings, can't use on a large scale.Use at present maximum landfills that is still, and landfill is the primitive method that finally will be eliminated.
Why, after sludge dewatering, still containing the moisture content of 80% left and right, is that the extracellular due to mud has one deck extracellular polymeric (EPS); The existence of this layer of EPS just, make the water ratio of 80% left and right become the limit of mechanical dehydration.About the relation between mud moisture content and EPS, scholars have the theoretical result of magnanimity; Remove or destroy EPS, can effectively reduce the water cut limit (can reach 60% left and right, generally also referred to as deep dehydration) of mechanical sludge dewatering, also being confirmed by scholars; Remove or destroy the method for EPS, scholars have also worked out a lot of methods.
Remove or destroy the method for EPS, mainly contain physical method (as ultrasonic, hot etc.) and chemical process (as acidolysis, alkaline hydrolysis, Fenton, quaternary ammonium salt conditioning, composite salt conditioning etc.), after utilizing these methods removals or destroying EPS, the effect of its deep dehydration fine although (water ratio can reach 60% left and right), but its processing cost is greatly improved, with traditional heat drying, burning, compost method, compare, cost advantage is very not outstanding.Utilize biological method to destroy EPS, as sludge digestion (comprising aerobic sigestion and anaerobic digestion), although cost is low, worsened the filtrability of mud, its deep dehydration effect is bad.
The overall view utilization is removed or is destroyed EPS and mud is carried out to the method for deep dehydration, nearly all from thickened sludge, sets about.And set about from dewatered sludge, substantially do not have.The present invention has avoided the shortcoming of the sludge digestion method of setting about from thickened sludge, from dewatered sludge, sets about, and a kind of method of deeply dehydrating sludge of Ultra Low Cost is provided.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of deeply dehydrating sludge.It is characterized in that:
Dewatered sludge is carried out to biological fermentation, ferment to certain hour, then carry out mechanical dehydration.
As preferably, described biological fermentation, be anaerobically fermenting.
As preferably, described biological fermentation, be aerobic fermentation.
As preferably, described dewatered sludge, its solid content is 7%～27%.
Compared with prior art, the beneficial effect of the method for deeply dehydrating sludge of the present invention is:
In the cost increase under condition seldom, the deep dehydration mud that can to obtain water ratio be 60% left and right.For space has been opened up in the follow-up disposal of mud.
The accompanying drawing explanation
Fig. 1 is the process flow diagram of the embodiment of the present invention one.
Fig. 2 is the process flow diagram of the embodiment of the present invention two.
Fig. 3 is the process flow diagram of the embodiment of the present invention three.
embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Embodiment mono-:
Deep sludge dewatering process flow process as shown in Figure 1 comprises the following steps:
Obtaining of step 1, raw material: the raw material of the present embodiment directly is taken under the sludge dewatering equipment in sludge dewatering workshop.From the overall operation cost consideration, Sewage Plant, when dewatering for the first time, can add less mud and adjust, and weakens the effect of dehydration for the first time, and the solid content that makes dewatered sludge is 17%.
Step 2, anaerobically fermenting: the dewatered sludge that is 17% by solid content is put into the anaerobically fermenting storehouse, carries out anaerobically fermenting.In the present embodiment, fermentation time is 59 hours.For fermentation energy is carried out smoothly, fermentation cabin need be incubated and seal.
Step 3, deep dehydration: the mud in the anaerobically fermenting storehouse is taken out, put into the screw rod pressure filter and carry out deep dehydration, can obtain the deep dehydration mud of water ratio 60%.In the component of mud, the overwhelming majority is the cell of inactivation; The anaerobic fermentation process of mud, be the process of newborn microbiological deterioration inactivation cell, and at first newborn microorganism degrades is exactly the EPS of inactivation cell; Although newborn microorganism also will generate some EPS, the EPS of degraded will be much larger than the EPS generated; Due to the degraded of EPS, discharge the much moisture content that can mechanical remove, thereby the mud after dehydration can carry out deep dehydration again.Due to mud, after anaerobically fermenting, its foul smell is very serious, and therefore, foul smell processing and operator's Labor Protection is carried out in the deep dehydration workshop.
Embodiment bis-:
Deep sludge dewatering process flow process as shown in Figure 2 comprises the following steps:
Obtaining of step 1, raw material: the raw material of the present embodiment is the dewatered sludge that the mud of sludge thickener is obtained through filtering.Owing to will carrying out aerobic fermentation, therefore, the mobility of dewatered sludge is most important; The dewatered sludge solid content in dehydration workshop all is greater than 15%, is the plastic solid that substantially there is no mobility, unavailable; Best bet is filtered the mud of sludge thickener, makes it become the pasty material with mobility.In the present embodiment, the solid content of dewatered sludge is 10%.
Step 2, aerobic fermentation: the dewatered sludge that is 10% by solid content is put into the aerobic fermentation pond, blasts air with gas blower and carries out aeration, carries out aerobic fermentation.In the present embodiment, fermentation time is 9 hours.
Step 3, deep dehydration: the mud in the aerobic fermentation pond is pumped, with carrying out deep dehydration in plate-and-frame filter press, can obtain the deep dehydration mud of water ratio 60%.
Embodiment tri-:
Deep sludge dewatering process flow process as shown in Figure 3 comprises the following steps:
Obtaining of step 1, raw material: the raw material of the present embodiment is the dewatered sludge that solid content is 12%, and the mud in sludge thickener is filtered or suction filtration obtains.Why will select this raw material, be that power of agitator consumption is little, during anaerobically fermenting, is beneficial to mass transfer, can shorten fermentation time because mud now still has mobility.
Step 2, anaerobically fermenting: the dewatered sludge that is 12% by solid content is put into the anaerobically fermenting pond, seals and stirs, and carries out anaerobically fermenting.In the present embodiment, fermentation time is 10 hours.
Step 3, deep dehydration: the mud in the anaerobically fermenting pond is pumped, with carrying out deep dehydration in plate-and-frame filter press, can obtain the deep dehydration mud of water ratio 60%.In the present embodiment, fermentation time is shorter, and in the acidication stage of fermenting process in anaerobically fermenting, therefore, odor concentration is less than embodiment mono-.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection domain, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (4)
1. a deep dehydration method for sludge, is characterized in that: dewatered sludge is carried out to biological fermentation, ferment to certain hour, then carry out mechanical dehydration.
2. deep dehydration method for sludge according to claim 1, is characterized in that, described biological fermentation is anaerobically fermenting.
3. deep dehydration method for sludge according to claim 1, is characterized in that, described biological fermentation is aerobic fermentation.
4. deep dehydration method for sludge according to claim 1, is characterized in that, described dewatered sludge, and its solid content is 7%～27%.
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| CN2013103319372A CN103435240A (en) | 2013-08-02 | 2013-08-02 | Fermentation and re-dewatering method of dewatered sludge |
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| CN2013103319372A CN103435240A (en) | 2013-08-02 | 2013-08-02 | Fermentation and re-dewatering method of dewatered sludge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104310741A (en) * | 2014-11-13 | 2015-01-28 | 轻工业环境保护研究所 | Hydrolytic acidification re-dehydration method for dehydrated sludge |
| CN105948445A (en) * | 2016-06-30 | 2016-09-21 | 浙江环耀环境建设有限公司 | Leather wastewater sludge treatment process |
| CN107381999A (en) * | 2017-07-17 | 2017-11-24 | 天津大学 | A kind of deep dehydration method for sludge |
Citations (4)
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| JPH11309438A (en) * | 1998-05-01 | 1999-11-09 | Ataka Constr & Eng Co Ltd | Waste treating method |
| CN101143758A (en) * | 2006-09-12 | 2008-03-19 | 镇江同盛环保设备工程有限公司 | Sludge resource treatment complete equipment for urban sewage treatment plant |
| CN101948231A (en) * | 2010-10-14 | 2011-01-19 | 北京科技大学 | High-concentration anaerobic sludge digestion treatment process for carrying out mechanical dewatering on sludge |
| CN103058476A (en) * | 2012-12-31 | 2013-04-24 | 天津北洋百川生物技术有限公司 | Novel treatment method for excess sludge |
-
2013
- 2013-08-02 CN CN2013103319372A patent/CN103435240A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11309438A (en) * | 1998-05-01 | 1999-11-09 | Ataka Constr & Eng Co Ltd | Waste treating method |
| CN101143758A (en) * | 2006-09-12 | 2008-03-19 | 镇江同盛环保设备工程有限公司 | Sludge resource treatment complete equipment for urban sewage treatment plant |
| CN101948231A (en) * | 2010-10-14 | 2011-01-19 | 北京科技大学 | High-concentration anaerobic sludge digestion treatment process for carrying out mechanical dewatering on sludge |
| CN103058476A (en) * | 2012-12-31 | 2013-04-24 | 天津北洋百川生物技术有限公司 | Novel treatment method for excess sludge |
Non-Patent Citations (1)
| Title |
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| 白海梅: "城市水质净化厂污泥的好氧发酵处理和利用", 《中国市政工程》, no. 5, 31 December 2003 (2003-12-31) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104310741A (en) * | 2014-11-13 | 2015-01-28 | 轻工业环境保护研究所 | Hydrolytic acidification re-dehydration method for dehydrated sludge |
| CN105948445A (en) * | 2016-06-30 | 2016-09-21 | 浙江环耀环境建设有限公司 | Leather wastewater sludge treatment process |
| CN105948445B (en) * | 2016-06-30 | 2018-10-09 | 浙江环耀环境建设有限公司 | A kind of leather waste water sludge treatment technique |
| CN107381999A (en) * | 2017-07-17 | 2017-11-24 | 天津大学 | A kind of deep dehydration method for sludge |
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Application publication date: 20131211 |