CN107265806A - A kind of excess sludge handling process based on carbon source reuse - Google Patents
A kind of excess sludge handling process based on carbon source reuse Download PDFInfo
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- CN107265806A CN107265806A CN201710667615.3A CN201710667615A CN107265806A CN 107265806 A CN107265806 A CN 107265806A CN 201710667615 A CN201710667615 A CN 201710667615A CN 107265806 A CN107265806 A CN 107265806A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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
- 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
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- Health & Medical Sciences (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The present invention discloses a kind of excess sludge handling process based on carbon source reuse, is related to excess sludge of municipal sewage plant technical field of anaerobic fermentation.Excess sludge is first passed through into alkaline Pretreatment, sludge cell disintegration, larger molecular organicses such as protein, polysaccharide etc. is discharged into supernatant, then sludge hydrolysis, acidification starts (pH=6) stage through acidity, be conducive to keeping the activity of acid-producing microorganisms, promote VFAs accumulation, it can suppress the activity of methanogen by alkaline fermentation (pH=10) stage, avoid consuming VFAs during methanogen methane phase, maintain production Radiation grafting and be better than methane phase effect, so that SCOD in anaerobic hydrolysate, VFAs cumulative concentration is greatly improved, for the regenerated carbon source that mark upgrading provides high-quality that carries of low C/N municipal sewages.
Description
Technical field
Carbon source reuse is based on the present invention relates to sludge from wastewater treatment plant technical field of anaerobic fermentation, more particularly to one kind
Excess sludge handling process.
Background technology
With the fast development of sewage treatment industry, the yield of sludge is more and more.According to《At 2015-2016 sludge
Manage Market Report》, ended for the end of the year 2015, the sludge annual production that China's municipal sewage treatment process is produced is up to 70,000,000 tons
More than.How to realize minimizing, stabilisation, recycling, the harmless treatment of sludge turns into the weight that municipal sewage plant faces
Hang-up.
South China area rainwater is more, and drainage system is generally combined system in addition, causes the universal face of urban wastewater treatment firm
Face into sewage carbon-nitrogen ratio it is relatively low the problem of, puzzlement is caused to subsequent biological treatment system, typically by living dirty to low ratio of carbon to ammonium
External carbon source is added in water to realize the qualified discharge of water outlet, but this can further increase the cost of sewage disposal.Sewage disposal
Energy consumption and cost are reduced in technique turns into the key of sustainable development.Organic carbon source is produced using city excess sludge anaerobic fermentation
To strengthen aerobic biological denitrification dephosphorization, it is one and solves the important channel that low C/N municipal sewages propose mark upgrade job, in realization to have
Machine thing reaches the purpose of sludge reduction and recycling while recycling.
Anaerobic sludge digestion is a complex biological chemical process participated in by multiple-microorganism, the change of process condition
Change can influence the operational effect of system, such as because the sour mistake of production occurs in the change of control condition in two-phase anaerobic digestion system
Very with " the acidifying state " of methanogenic phase.Organic matter conversion is turned to acetic acid by the acidified effect of sludge, and methanogen produces first
Acetic acid can be consumed during alkane, is unfavorable for the accumulation of organic carbon source, thus is hydrolyzed to develop organic carbon source as the excess sludge of target
Keep sludge production Radiation grafting to be better than methane phase effect in acidification system, be the recycling sludge processing work based on carbon source regeneration
The key of skill.
The content of the invention
The purpose of the present invention is to be directed in existing sludge treatment technique that organic acid cumulant in Hydrolysis Acidification is relatively low, water
There is provided a kind of excess sludge handling process based on carbon source reuse for the Reverse transcriptase problem of solution acidifying bacterium and methane backeria.
Technical scheme is as follows：A kind of excess sludge handling process based on carbon source reuse, including following technique
Step：
(1) excess sludge alkaline Pretreatment：5mol/L NaOH conditioning of mud pH value is used for 10,90 DEG C of heating dresses are placed in
Put middle heated at constant temperature and carry out alkaline Pretreatment, the alkaline Pretreatment time is 2h, and is stirred continuously.Excess sludge alkaline Pretreatment energy
The cell membrane of microorganism, promotes the dissolving of extracellular polymeric (EPS) and the release of internal carbon source so that macromolecular enough in destruction sludge
Organic matter such as protein, polysaccharide etc. are discharged.
(2) the acid startup of reactor：Sludge after alkaline Pretreatment is pumped into and is thoroughly mixed the fermentation of formula sludge anaerobic instead
Answer in device (CSTR), pH value is adjusted as 6 using watery hydrochloric acid, then regularly ripe hydrolysis acidification sludge is tamed in inoculation daily, directly
The inoculum concentration of sludge reaches 30%-40% in reactor, and acid start is carried out to reactor and is tamed, wherein taming the water of maturation
Solution acidification sludge and the volume ratio of sludge being vaccinated are 10%, are then stirred using mechanical agitator, control the rotating speed to be
Acidifying is hydrolyzed under 100rmp, room temperature condition.It is 8 days to control acid time startup stage.Sewage treatment plant's pretreatment pool
Or containing substantial amounts of hydrolytic bacteria and acidifying bacterium in the hydrolysis acidification sludge of the domestication maturation in biochemistry pool, so as to promote to be connect
Plant the hydrolysis acidification of sludge.Be conducive to keeping the activity of acid-producing microorganisms under conditions of acidity startup pH=6.
(3) alkaline fermentation：Under acid condition after the completion of the startup domestication of reactor, regulation reactor pH is gradually increasing from 6
To 10, into the operational mode of alkaline fermentation, reactor pH is adjusted using 5mol/L NaOH per 24h, maintenance reaction device pH is 10
+ 0.2 carries out the alkaline fermentation of excess sludge.The reactor is run with semi continuous mode, i.e., reactor discontinuous is run, daily
Enter mud and spoil disposal to regulate and control the SRT in reactor (sludge retention time) by timing, sludge retention time be respectively 12d, 8d,
6d, 6d, are controlled anaerobic sludge digestion in the hydrolysis acidification stage by SRT regulation and control.And daily timing sampling determines hydrolysis
In acidifying solution the concentration (concentration of resolvable chemical oxygen demand SCOD, carbohydrate, protein etc.) of dissolved organic matter with
And production acid amount (volatile fatty acid VFAs yield).PH=10 is controlled during alkaline fermentation, is further enhanced to production first
The inhibitory action of alkane bacterium, it is to avoid consume VFAs during methanogen methane phase.
(4) the dissolved organic carbon source that resourcebility is utilized is obtained:By hydrolysis acidizing product precipitation one in the step (3)
Separation of solid and liquid is carried out after the section time, the sludge hydrolysis, acidification liquid containing high concentration organic carbon source is obtained.
Using such scheme, excess sludge is after alkaline Pretreatment, sludge cell disintegration, larger molecular organicses such as albumen
Matter, polysaccharide etc. are discharged into supernatant, and then sludge hydrolysis, acidification is conducive to keeping production acid micro- through acidity startup (pH=6) stage
Biological activity, promotes VFAs accumulation, the activity of methanogen can be suppressed by alkaline fermentation (pH=10) stage, it is to avoid production
VFAs is consumed during methane backeria methane phase, production Radiation grafting is maintained and is better than methane phase effect, so that anaerobic hydrolysate
Middle SCOD, VFAs cumulative concentration are greatly improved, for the regenerated carbon source that mark upgrading provides high-quality that carries of low C/N municipal sewages.
Brief description of the drawings
Fig. 1 is each composition statistical form of the fresh sludge of the present invention.
Fig. 2 is dissolved organic matter (SCOD) change in concentration figure in Hydrolysis Acidification.
Fig. 3 is VFAs content cumulative charts in Hydrolysis Acidification.
Fig. 4 is polysaccharide concentration variation diagram in Hydrolysis Acidification.
Fig. 5 is protein concentration variation diagram in Hydrolysis Acidification.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
In order to promote the accumulation of organic acid, promote carbon source reuse, it is dirty that the present invention provides a kind of residue based on carbon source reuse
Sludge treatment technology, is comprised the technical steps that：
(1) excess sludge alkaline Pretreatment：Supernatant is excluded after the fresh sludge fetched is stood into concentration 24h, this is fresh
The property of sludge is as shown in figure 1, wherein SCOD concentration is 550mg/L, and VFAs concentration is less than 10mg/L.Using 5mol/L's
NaOH conditioning of mud pH value is 10, is placed in heated at constant temperature in 90 DEG C of heaters and carries out alkaline Pretreatment 2h, and is stirred continuously.
(2) the acid startup of reactor：Sludge after alkaline Pretreatment is pumped into and is thoroughly mixed the fermentation of formula sludge anaerobic instead
Answer in device (CSTR), pH value is adjusted as 6 using watery hydrochloric acid, then regularly ripe hydrolysis acidification sludge is tamed in inoculation daily, directly
The inoculum concentration of sludge reaches 30%-40% in reactor, and acid start is carried out to reactor and is tamed, wherein taming the water of maturation
Solution acidification sludge and the volume ratio of sludge being vaccinated are 10%, are then stirred using mechanical agitator, control the rotating speed to be
Acidifying is hydrolyzed under 100rmp, room temperature condition.It is 8 days, each index of timing sampling to control acid time startup stage.
(3) alkaline fermentation：Under acid condition reactor startup domestication after the completion of, regulation reactor pH from 6.0 gradually on
10 are raised to, into the operational mode of alkaline fermentation, reactor pH is adjusted using 5mol/L NaOH per 24h, maintenance reaction device pH is
10+0.2 carry out the alkaline fermentation of excess sludge.The reactor is run with semi continuous mode, enters mud and row by timing daily
Mud regulates and controls the SRT in reactor (sludge retention time), is controlled anaerobic sludge digestion in hydrolysis acidification by SRT regulation and control
In the stage, set SRT initial value as 12 days, then progressively shorten SRT until optimal production acid condition, regulation SRT be respectively 12d,
8d、6d、6d.And daily timing sampling determines the concentration (resolvable chemical oxygen demand of dissolved organic matter in anaerobic hydrolysate
The concentration of SCOD, carbohydrate, protein etc.) and production acid amount (volatile fatty acid VFAs yield).
(4) the dissolved organic carbon source that resourcebility is utilized is obtained:By hydrolysis acidizing product precipitation one in the step (3)
Separation of solid and liquid is carried out after the section time, the sludge hydrolysis, acidification liquid containing high concentration organic carbon source is obtained.
Be above experimental group R0, then set a control group R1, in control group R1, remaining step and condition with experimental group R0
Equally, it is only otherwise varied in step (2) and experimental group R0.
The step of control group R1 (2), starts for alkalescence：Sludge after alkaline Pretreatment has been pumped into CSTR, pH value is adjusted
For 10, the then regularly ripe hydrolysis acidification sludge of inoculation domestication daily, until the inoculum concentration of sludge reaches in reactor
30%-40%, carry out alkalescence to reactor and start to tame, wherein taming the hydrolysis acidification sludge and the sludge that is vaccinated of maturation
Volume ratio is 10%, is then stirred using mechanical agitator, controls rotating speed for 100rmp, acidifying is hydrolyzed under room temperature condition.
It is 8 days to control alkaline time startup stage, and timing sampling detects each index.
From Fig. 2 to Fig. 5, experimental group R0 under acid entry condition (pH=6), the alkaline fermentation stage by SRT from
When progressively foreshortening to 6 days within 12 days, SCOD, VFAs cumulative concentration are more right respectively up to 6000-6300mg/L, 1500-1700mg/L
Increase the acetic acid in 1033mg/L, 183.5mg/L, experimental group R0 in VFAs respectively according to the alkaline entry conditions (pH=10) of group R1
Cumulant is up to 69.0%, and polysaccharide and protein concentration respectively reach 650-700mg/L, 280-300mg/L in anaerobic hydrolysate.
When it is 4d further to shorten SRT, sludge hydrolytic production acid deteriorates, SCOD and VFAs concentration is reduced.
In summary, excess sludge is after alkaline Pretreatment, sludge cell disintegration, larger molecular organicses such as protein,
Polysaccharide etc. is discharged into supernatant, and then sludge hydrolysis, acidification is conducive to keeping producing sour micro- life through acidity startup (pH=6) stage
The activity of thing, promotes VFAs accumulation, the activity of methanogen can be suppressed by alkaline fermentation (pH=10) stage, it is to avoid production first
VFAs is consumed during alkane bacterium methane phase, production Radiation grafting is maintained and is better than methane phase effect, so that in anaerobic hydrolysate
SCOD, VFAs cumulative concentration are greatly improved, for the regenerated carbon source that mark upgrading provides high-quality that carries of low C/N municipal sewages.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Any modifications, equivalent substitutions and improvements made within principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of excess sludge handling process based on carbon source reuse, it is characterised in that comprise the technical steps that：
(1) excess sludge alkaline Pretreatment：Conditioning of mud pH value is 10, is placed in heated at constant temperature in 90 DEG C of heaters and carries out thermokalite
Pretreatment, the alkaline Pretreatment time is 2h, and is stirred continuously；
(2) the acid startup of reactor：Sludge after alkaline Pretreatment is pumped into and is thoroughly mixed formula sludge anaerobic fermentation reactor
In, regulation pH value is 6, then the ripe hydrolysis acidification sludge of inoculation domestication, and acid start is carried out to reactor and is tamed, wherein taming and dociling
The volume ratio of the ripe hydrolysis acidification sludge of chemical conversion and the sludge being vaccinated is 10%；
(3) alkaline fermentation：Under acid condition after the completion of the startup domestication of reactor, regulation reactor pH gradually rises to from 6.0
10, into the operational mode of alkaline fermentation；
(4) the dissolved organic carbon source that resourcebility is utilized is obtained:By when hydrolysis acidizing product precipitates one section in the step (3)
Between after carry out separation of solid and liquid, obtain the sludge hydrolysis, acidification liquid of the organic carbon source containing high concentration.
2. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that in the step
(2) in, the ripe hydrolysis acidification sludge of the domestication of timing inoculation daily, until the inoculum concentration of sludge reaches 30%- in reactor
40%, then stirred using mechanical agitator, control rotating speed for 100rmp, acidifying is hydrolyzed under room temperature condition.
3. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that the step
(2) acid startup domestication lasts 8 days in.
4. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that in the step
(3) in, after the completion of reactor start-up domestication, reactor pH is adjusted per 24h using 5mol/L NaOH, maintenance reaction device pH is
10+0.2 carry out the alkaline fermentation of excess sludge.
5. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that the reactor
Run with semi continuous mode, enter mud and spoil disposal to regulate and control the sludge retention time in reactor by timing daily.
6. the excess sludge handling process according to claim 5 based on carbon source reuse, it is characterised in that during sludge retention
Between be respectively 12d, 8d, 6d, 6d.
7. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that the step
(3) during alkaline fermentation, daily timing sampling determines the concentration of dissolved organic matter and production acid in anaerobic hydrolysate
Amount.
8. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that in the step
(1) in, use 5mol/L NaOH come the pH of conditioning of mud for 10.
9. the excess sludge handling process according to claim 1 based on carbon source reuse, it is characterised in that in the step
(2) in, watery hydrochloric acid is used to adjust pH value for 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710667615.3A CN107265806B (en) | 2017-08-07 | 2017-08-07 | Excess sludge treatment process based on carbon source recycling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110282841A (en) * | 2019-08-06 | 2019-09-27 | 深圳市深水水务咨询有限公司 | A kind of municipal sludge front end decrement and middle-end volume reduction system |
| CN110760353A (en) * | 2019-11-01 | 2020-02-07 | 湖南三五二环保科技有限公司 | Method for producing clean energy by utilizing kitchen waste |
| CN112811764A (en) * | 2021-01-15 | 2021-05-18 | 河南中中中环保设备有限公司 | High-temperature high-pressure cracking treatment process based on sludge organic matter |
| WO2022048206A1 (en) * | 2020-09-01 | 2022-03-10 | 浙江湖州金洁水务股份有限公司 | Method for extracting cod from excess sludge |
| CN114606274A (en) * | 2022-03-22 | 2022-06-10 | 太原理工大学 | Method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge |
| CN114751606A (en) * | 2022-04-29 | 2022-07-15 | 天津博诺环保技术有限公司 | Multi-process combined enhanced sludge carbon source recycling method |
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| CN101708932A (en) * | 2009-12-18 | 2010-05-19 | 北京工业大学 | Sludge carbon source two-stage alkaline hydrolysis acidizing recovery method |
| CN102633416A (en) * | 2012-04-12 | 2012-08-15 | 北京工业大学 | Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge |
| CN105776787A (en) * | 2016-05-13 | 2016-07-20 | 广东省工程技术研究所 | Method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws |
-
2017
- 2017-08-07 CN CN201710667615.3A patent/CN107265806B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708932A (en) * | 2009-12-18 | 2010-05-19 | 北京工业大学 | Sludge carbon source two-stage alkaline hydrolysis acidizing recovery method |
| CN102633416A (en) * | 2012-04-12 | 2012-08-15 | 北京工业大学 | Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge |
| CN105776787A (en) * | 2016-05-13 | 2016-07-20 | 广东省工程技术研究所 | Method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110282841A (en) * | 2019-08-06 | 2019-09-27 | 深圳市深水水务咨询有限公司 | A kind of municipal sludge front end decrement and middle-end volume reduction system |
| CN110760353A (en) * | 2019-11-01 | 2020-02-07 | 湖南三五二环保科技有限公司 | Method for producing clean energy by utilizing kitchen waste |
| WO2022048206A1 (en) * | 2020-09-01 | 2022-03-10 | 浙江湖州金洁水务股份有限公司 | Method for extracting cod from excess sludge |
| CN112811764A (en) * | 2021-01-15 | 2021-05-18 | 河南中中中环保设备有限公司 | High-temperature high-pressure cracking treatment process based on sludge organic matter |
| CN114606274A (en) * | 2022-03-22 | 2022-06-10 | 太原理工大学 | Method for producing carboxylic acid with high added value by utilizing synthesis gas to strengthen anaerobic fermentation of sludge |
| CN114751606A (en) * | 2022-04-29 | 2022-07-15 | 天津博诺环保技术有限公司 | Multi-process combined enhanced sludge carbon source recycling method |
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