CN105174680B - A kind of staged hydrolysis improves sludge pretreatment efficiency and the method for dehydrating effect - Google Patents
A kind of staged hydrolysis improves sludge pretreatment efficiency and the method for dehydrating effect Download PDFInfo
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Abstract
The invention discloses a kind of sludge pre-treatment methods, it is characterised in that：According to carbon source bond strength in sludge, carry out processing stage by stage by stepping up hydrolysis intensity to sludge, and in each stage after, first the carbon source of release is recycled, then carry out next stage processing.
Description
Technical field
The invention belongs to organic solid waste processing and recycling fields.More particularly it relates to one kind passes through
Staged hydrolysis releases carbon and improves sludge pretreatment efficiency and the method for dehydrating effect.
Background technology
Treatment of Sludge is Chinese one of most pressing environmental problem at present with disposition, by the end of the end of the year 2010, China's dehydration
Nearly 22,000,000 tons of sludge yield, it is predicted that at least up to 26,150,000 tons of year ends 2015.Anaerobic digestion is sludge reduction, stabilizes
With the important technology of recycling, but the protective effect of Extracellular polymers and cohesion and microorganism wall becomes hydrolysis
The rate-limiting step of anaerobic sludge digestion.To promote sludge hydrolytic, people have carried out a large amount of research to different preprocess methods,
Including heating, add chemical method (acid adding plus alkali), mechanical crushing method, freezing and biological hydrolysis process etc..
But there are following urgent problems to be solved for the preprocess method of traditional single intensity：(1) sludge hydrolytic process
The energy and material consumption are excessive, need to crack in the cell of sludge microbe, and just the hydrolysis power of necessary additional some strength, such as high
Temperature, highly basic etc..(2) hydrolysis method is excessively single, is not matched that with the complexity of sludge components, and energy and physical waste are serious.
Using the hydrolysis method of single intensity, the sludge carbon source on the one hand causing binding force big cannot effectively discharge；On the other hand, it is right
In the weak sludge carbon source of binding force, high intensity hydrolysis, the carbon source for wasting energy or even having discharged part is re-converted into not
Available substance, such as melanoidin.(3) substances such as a large amount of protein are released during sludge hydrolytic, makes sewage sludge viscosity
Increase, it is more difficult to be dehydrated, cause the carbon source rate of recovery relatively low.
In view of the above problems, the present invention according to the occurrence form of carbon source in sludge, selects the pretreatment condition of respective strengths,
The carbon source in sludge is promoted gradually to be discharged and recycled to intracellular by extracellular, reached energy-saving, improved hydrolysis efficiency, Yi Jigai
The purpose of kind pretreating sludge dehydration efficiency.
Invention content
Carbon is released by staged hydrolysis the purpose of the present invention is to provide one kind and improves sludge pretreatment efficiency and dehydration effect
The method of fruit according to the occurrence form of carbon source in sludge, selects the pretreatment condition of respective strengths, promote carbon source in sludge by
It is extracellular to arrive the release and recycling of intracellular gradually, to reach energy-saving, improve pretreatment efficiency and improvement pretreating sludge is dehydrated
The purpose of efficiency.
To achieve these goals, technical scheme is as follows：I-stage：Relatively mild pretreatment condition is selected, is promoted
Make to be free in the carbon source in sludge preferably to be discharged.The II stages：The slightly strong pretreatment condition of selection, promotes thin with microorganism
Born of the same parents are preferably discharged with reference to weaker carbon source (such as sponginess EPS).The III stages：Further strengthen hydrolysis intensity, promote with it is micro-
Biological cell is preferably discharged with reference to stronger carbon source (such as compactness EPS).The IV stages：Then strengthen hydrolysis intensity, promote
The carbon source for being present in intracellular is preferably discharged.Moreover, the carbon source that each stage end first discharges it recycles, then carry out
Carbon is released in the hydrolysis of next stage.
Compared with the preprocess method of traditional single intensity, the present invention has the following advantages：(1) depositing according to sludge carbon source
In form, targetedly pretreatment condition is selected, had not only avoided the waste of energy, but also promote the carbon source in sludge more sufficient
Release, improves pretreatment efficiency.(2) it by release stage by stage and recycling carbon source, avoids single intensity pretreatment and is released
Deterioration of the substances such as the protein put to dewatering performance of sludge enhances the dewatering of pretreating sludge, improves release carbon
The rate of recovery in source.(3) by carrying out stepped recycling to the carbon source discharged, the excessive water for having discharged carbon source is avoided
Solution, reduces the formation of by-product difficult to degrade, improves the overall quality of release carbon source.
More specifically, the present invention provides the following terms：
1. sludge pre-treatment method, it is characterised in that：It is strong by stepping up hydrolysis according to carbon source bond strength in sludge
Spend and processing stage by stage carried out to sludge, and in each stage after, first the carbon source of release is recycled, then carries out next
Phase process.
2. the method for the 1st, the method includes with the next stage：
I-stage：Relatively mild condition processing sludge is selected, the free carbon source in sludge is promoted to be released；The II stages：Choosing
More stronger than I-stage condition processing sludge is selected, promotes to be combined weaker carbon source with the microbial cell in sludge and is released；
The III stages：Selection condition processing sludge more stronger than the II stages, promotes to be combined stronger carbon source with the microbial cell in sludge
It is released；The IV stages：Selection condition processing sludge more stronger than the III stages, promotes the carbon in the microbial cell in sludge
Source is released,
Wherein in each stage after mud-water separation is carried out to the sludge of processing to recycle discharged carbon source, then by institute
The residue obtained is used for next stage.
3. the method for the 2nd, wherein the I-stage is mild heat treatment, the II stages are than the I-stage temperature
Higher heat treatment, the III stages be while the temperature for being kept for II stages by the pH of sludge be adjusted to alkalinity with into
Row hot alkali treatment, and the IV stages are the hot alkali treatments in the higher temperature compared with the III stages and pH progress.
4. the method for the 3rd, wherein the treatment conditions of the four-stage are：I-stage：50 DEG C -70 DEG C, not conditioning of mud
pH；The II stages：70 DEG C -90 DEG C, do not adjust sludge pH；The III stages：70 DEG C -90 DEG C, sludge pH is adjusted to 10-12；The IV stages：
80 DEG C -100 DEG C, sludge pH is adjusted to 11-13.
5. the method for the 3rd, wherein the treatment conditions of the four-stage are：I-stage：60 DEG C, do not adjust sludge pH；II
Stage：80 DEG C, do not adjust sludge pH；The III stages：80 DEG C, sludge pH is adjusted to 11；The IV stages：90 DEG C, sludge pH is adjusted to
12。
6. the method for the 2nd, wherein before treatment, the concentration of sludge is adjusted to 20-70gTS/L with water.
7. the sludge after the phase process wherein after in each stage, is centrifuged 10 by the method for the 2nd under 7000r
Minute, to carry out mud-water separation, next stage was carried out after the residue of gained is recalled to original content with water.
8. the method for the 4th or 5, wherein the processing time in the I-stage and II stages is 2-5 hours, and the III
The processing time in stage and IV stages is 5-8 hours.
9. the method for the 1st or 2, wherein to be taken from the secondary settling tank of municipal wastewater treatment plant by the sludge that the method is handled
Or the sludge of sedimentation basin.
Description of the drawings
Fig. 1 is the release rule that ladder releases SCOD during carbon.
Fig. 2 is the release conditions figure of the single intensity pretreating sludge SCOD of tradition.
Fig. 3 is the situation of change that ladder releases CST during carbon.
Fig. 4 is the situation of change of the CST of the single intensity pretreating sludge of tradition.
Specific embodiment
The present invention is further described, but do not limited by drawings and examples below in conjunction with attached drawing and example.
The secondary settling tank or sedimentation basin of municipal wastewater treatment plant are derived from suitable for the excess sludge of the method for the present invention, main object in sludge
Matter is the organic matters such as protein, polysaccharide and organic acid, accounts for about more than the 50% of sludge gross mass.
Embodiment 1
Using the sludge through overcompression after municipal sewage plant's secondary settling tank as object, moisture content is 85% or so, is used
Its concentration is transferred to 30gTS/L by distilled water.Experimental program is：I-stage：It 60 DEG C, is handled in the case where not adjusting sludge pH dirty
Mud 3h；The II stages：80 DEG C, sludge 3h is handled in the case where not adjusting sludge pH；The III stages：80 DEG C, the pH of sludge is adjusted
To 11,6h is handled；The IV stages：90 DEG C, the pH of sludge is adjusted to 12, handles 6h.Per stage end, all by treated, sludge is used
Eppendorf 5804R centrifuges centrifuge 10 minutes under 7000r and carry out mud-water separation, residue calling distilled water are recalled to former dense
Next stage is carried out after degree.The sludge of 3h will be pre-processed under the conditions of 90 DEG C, pH=12 as control.Fig. 1 and Fig. 2 is respectively this
Invention and the single intensity of tradition pre-process discharged SCOD.From figure 1 it appears that steps rule are presented in the release of SCOD
Rule, and the pretreatment with traditional single intensity is compared, the SCOD that this method is finally discharged increases 25% or so.
Embodiment 2
Using the sludge through overcompression after municipal sewage plant's secondary settling tank as object, moisture content is 85% or so, is used
Its concentration is transferred to 30gTS/L by distilled water.Experimental program is：I-stage：It 60 DEG C, is handled in the case where not adjusting sludge pH dirty
Mud 3h；The II stages：80 DEG C, sludge 3h is handled in the case where not adjusting sludge pH；The III stages：80 DEG C, the pH of sludge is adjusted
To 11,6h is handled；The IV stages：90 DEG C, the pH of sludge is adjusted to 12, handles 6h.Per stage end, all by treated, sludge is used
Eppendorf 5804R centrifuges centrifuge 10 minutes under 7000r and carry out mud-water separation, and residue is recalled to original content with distilled water
After carry out next stage.The sludge of 3h will be pre-processed under the conditions of 90 DEG C, pH=12 as control.Fig. 3 and Fig. 4 is we respectively
The situation of change of the CST of method and the single intensity pretreating sludge of tradition, it can be seen from the figure that the CST of this method terminal stage
Value it is more traditional have dropped 1/2 or so.So as to which this method can a degree of dewatering for improving pretreating sludge.
Claims (6)
1. sludge pre-treatment method, it is characterised in that：According to carbon source bond strength in sludge, by stepping up hydrolysis intensity pair
Sludge carries out processing stage by stage, and in each stage after, first the carbon source of release is recycled, then carry out next stage
Processing, the method includes with the next stage：
I-stage：Relatively mild condition processing sludge is selected, the free carbon source in sludge is promoted to be released；The II stages：Selection ratio
I-stage stronger condition processing sludge, promotes to be combined weaker carbon source with the microbial cell in sludge and is released；III ranks
Section：Selection more stronger than II stages condition processing sludge, promotes to be combined stronger carbon source with the microbial cell in sludge and obtains
Release；The IV stages：Selection condition processing sludge more stronger than the III stages, promotes the carbon source in the microbial cell in sludge to obtain
To release,
Wherein in each stage after mud-water separation is carried out to the sludge of processing to recycle discharged carbon source, then by gained
Residue is used for next stage,
Wherein described I-stage is mild heat treatment, and the II stages are heat treatment more higher than the I-stage temperature, described
The III stages are that the pH of sludge is adjusted to alkalinity to carry out hot alkali treatment, and institute while the temperature for being kept for the II stages
It is the hot alkali treatment in the higher temperature compared with the III stages and pH progress to state the IV stages,
The treatment conditions of wherein described four-stage are：I-stage：50 DEG C -70 DEG C, do not adjust sludge pH；The II stages：70℃-90
DEG C, do not adjust sludge pH；The III stages：70 DEG C -90 DEG C, sludge pH is adjusted to 10-12；The IV stages：80 DEG C -100 DEG C, by sludge
PH is adjusted to 11-13.
2. the method for claim 1 wherein the treatment conditions of the four-stage are：I-stage：60 DEG C, do not adjust sludge pH；II
Stage：80 DEG C, do not adjust sludge pH；The III stages：80 DEG C, sludge pH is adjusted to 11；The IV stages：90 DEG C, sludge pH is adjusted to
12。
3. the method for claim 1 wherein before treatment, the concentration of sludge is adjusted to 20-70gTS/L with water.
4. after in each stage, the sludge after the phase process is centrifuged 10 under 7000r
Minute, to carry out mud-water separation, next stage was carried out after the residue of gained is recalled to original content with water.
5. the method for claim 1 wherein the processing time in the I-stage and II stages is 2-5 hours, and the III ranks
The processing time in section and IV stages is 5-8 hours.
6. the method for claim 1 wherein will by the method handle sludge be taken from municipal wastewater treatment plant secondary settling tank or
The sludge of sedimentation basin.
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| US5385673A (en) * | 1992-09-08 | 1995-01-31 | Hazen And Sawyer, P.C. | Method of treating wastewater biosolids |
| JP2005169284A (en) * | 2003-12-11 | 2005-06-30 | Kobe Steel Ltd | Organic sludge treatment method and organic sludge treatment apparatus |
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| CN104556631A (en) * | 2014-12-01 | 2015-04-29 | 同济大学 | Recycling treatment method for phosphorus-enriched aerobic granular sludge |
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| JPS6297698A (en) * | 1985-10-25 | 1987-05-07 | レナ−ト・ジ−・エリツクソン | Method of reconstituting and inverting sludge |
| US5385673A (en) * | 1992-09-08 | 1995-01-31 | Hazen And Sawyer, P.C. | Method of treating wastewater biosolids |
| JP2005169284A (en) * | 2003-12-11 | 2005-06-30 | Kobe Steel Ltd | Organic sludge treatment method and organic sludge treatment apparatus |
| CN101792246A (en) * | 2010-03-19 | 2010-08-04 | 中国科学院广州能源研究所 | Method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse |
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| WO2014139951A1 (en) * | 2013-03-09 | 2014-09-18 | Veolia Water Solutions And Technologies Support | Energy efficient system and process for treating sludge |
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