CN102583927B - Sludge micro oxygen hydrolytic acidizing method - Google Patents
Sludge micro oxygen hydrolytic acidizing method Download PDFInfo
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- CN102583927B CN102583927B CN2012100719400A CN201210071940A CN102583927B CN 102583927 B CN102583927 B CN 102583927B CN 2012100719400 A CN2012100719400 A CN 2012100719400A CN 201210071940 A CN201210071940 A CN 201210071940A CN 102583927 B CN102583927 B CN 102583927B
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
Abstract
The invention relates to a sludge micro oxygen hydrolytic acidizing method, which includes: inoculating sludge containing acid-producing bacteria in a hydrolytic acidizing reactor, intermittently inputting air to the middle of the hydrolytic acidizing reactor for air stirring, simultaneously supplementing intermittent mechanical stirring, performing hydrolytic acidizing on sludge of a sewage treatment plant under micro oxygen conditions with dissolved oxygen (DO) kept to be 0.4-0.8 mg/L, leading the sludge after hydrolytic acidizing treatment to enter a settling pond for sludge-water separation, and leading liquid supernatant to serve as carbon sources for municipal sewage biological de-nitrification and dephosphorization treatment. The sludge micro oxygen hydrolytic acidizing method is conducted at normal temperature, is not needed to be added with acid and alkali for adjusting potential of hydrogen (pH) value, is simple in operation, stable in running and capable of restraining growth of methane bacteria and improving stability of a sludge hydrolytic acidizing system, and simultaneously leads sludge to obtain reduction and stabilization treatment to the maximum extent. Sludge acid yield is improved by 38%-50%.
Description
Technical field
The invention belongs to sludge treatment and application technology as the second resource field, relate to a kind for the treatment of process of sludge of sewage treatment plant, particularly relate to a kind of little oxygen hydrolysis acidation treatment method of sludge of sewage treatment plant.
Background technology
Sludge of sewage treatment plant is hydrolysed ferment under anaerobic, can produce the short chain volatile acid such as acetic acid, propionic acid, butyric acid.With the carbon source of mud acid fermentation product as denitrifying bacteria, polyP bacteria, can reduce cost of sewage disposal, and can make sewage plant sludge minimizing and resource utilization.
Since the eighties in 20th century, more and more for the acidication stage research of anaerobic digestion abroad, wherein be to utilize the Sludge from primary sedimentation tank hydrolysed ferment of sewage work to produce voltaile fatty acid (VFA) mostly, also have and adopt the mixing sludge of primary sludge and excess sludge to study.And it is domestic very rarely seen to the sour research of mud product.Having some now studies show that: the acid-producing bacteria optimal pH is 6.0～7.0, and this scope has with the optimal pH 6.5～7.5 of methanobacteria and conflicts, thereby in the sludge hydrolysis, acidification reactor, can produce the methanation phenomenon inevitably, make system's fluctuation of service, and the product of mud acid amount is low.
ZL 200810054486.1 provides a kind of preparation method who processes the carbon source of waste water, and in this patent, biochemical reaction is 5.5～6.5 in the pH in acid fermentation stage value in the acid fermentation reactor, and the control temperature of acid fermentation reactor is 26 ℃～38 ℃.This patent requires to have heating unit control temperature, acid adding control pH, and production cost is high, and mud product acid amount is low.
[the energy environment protection such as Hu Yinghua; 2005; 19 (1): 28～31] carried out the pilot scale research that the little oxygen of sewage plant excess sludge digests; in its reactor, a part of mud has been in oxygen condition, and a part of mud is in anoxic condition; under aerobic state; amphimicrobe utilizes oxygen as the electron acceptor(EA) degradation of organic substances, replaces oxygen as electron donor by part nitrate anoxia condition is next, reaches the purpose of degrading microorganism body by the endogenous nitrate respiration.The digestion time of this research is 20 days, but there are no the accumulation of high density volatile acid.
Open congruence [Shanghai environmental science, 1995,14 (11): 15～16] and carried out the research that the little oxygen of excess sludge is cleared up technique; the reduction of mud is good; but because only adopting pneumatic blending, mud easily is deposited on the bottom, also there are no the accumulation of high density volatile acid.
Summary of the invention
The purpose of this invention is to provide a kind of little oxygen hydrolysis acidification mud method, with the method treatment plant's mud of disposing of sewage, can improve the stability of sludge hydrolysis, acidification treatment system, significantly improve mud and produce the acid amount.
Little oxygen hydrolysis acidification mud method of the present invention is the mud that inoculation contains acid-producing bacteria in reactor for hydrolysis and acidification, pass into air to the reactor for hydrolysis and acidification discontinuous and carry out pneumatic blending, and auxiliary intermittent type mechanical stirring simultaneously, be to the sludge of sewage treatment plant acidifying that is hydrolyzed under little oxygen condition of 0.4～0.8mg/L keeping dissolved oxygen DO, mud after acidication is processed enters the settling tank mud-water separation, the carbon source that supernatant liquor is processed as Biological Nutrient Removal.
Among the present invention, pneumatic blending and mechanical stirring are carried out simultaneously, and every interval 40～60min stirs once, each churning time 5～10min.
Wherein, the preferred 10～15W/m of mechanical stirring intensity
3Preferred 0.06～the 0.14m of the air capacity of pneumatic blending
3/ m
3The pond holds min.
Little oxygen hydrolysis acidification mud method of the present invention acidifying that under 20 ℃～25 ℃ conditions, is hydrolyzed, during pH value in the reactor for hydrolysis and acidification maintain 6.0～7.0.
The preferred reactor for hydrolysis and acidification of the present invention is sequencing batch reactor.
The little oxygen hydrolysis acidification of the present invention mud method specifically comprises following processing step:
1, the cultivation of acid-producing bacteria domestication
Inoculation accounts for sewage work's aerobic sludge of reactor volume 50%～70% in reactor for hydrolysis and acidification, and add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending, the two carries out simultaneously, every interval 40～60min stirs once, each churning time 5～10min, mechanical stirring intensity 10～15W/m
3, pneumatic blending air capacity 0.06～0.14m
3/ m
3The pond holds min, to keep in the reactor for hydrolysis and acidification dissolved oxygen DO as little oxygen condition of 0.4～0.8mg/L; Spoil disposal not in cultivating the domestication process, an intermittently discharged supernatant liquor fills into isopyknic carbohydrate organic waste water again as substratum after discharging supernatant liquor, stops to stir precipitation 0.5-1h, cyclical operation before row's supernatant liquor; The COD concentration and the volume that add carbohydrate organic waste water every day are determined organic loading rate 3～4gCOD/Ld, hydraulic detention time 3～4d by organic loading rate and hydraulic detention time; Treat in the reactor for hydrolysis and acidification that volatile acid concentration reaches 3000mg/L when above, finishes the cultivation of acid-producing bacteria and tames;
2, the acidication of sludge of sewage treatment plant
With VS(volatile solid concentration) be 15～25g/L, VS/TS(volatile solid concentration/total solid concentration) ratio greater than 0.5 sludge of sewage treatment plant as entering mud, entering step 1 has cultivated in the reactor of having tamed acid-producing bacteria, carry out mechanical stirring and pneumatic blending, the two carries out simultaneously, every interval 40～60min stirs once, each churning time 5～10min, mechanical stirring intensity 10～15W/m
3, pneumatic blending air capacity 0.06～0.14m
3/ m
3The pond holds min; Discharge after entering the solid retention time that mud in the reactor satisfies 3～6d, will stir 5～10min before the spoil disposal every day, discharges the muddy water mixed solution that is rich in volatile acid, fills into isopyknic new sludge of sewage treatment plant, cyclical operation simultaneously again;
The acidifying that under 20 ℃～25 ℃, is hydrolyzed of above-mentioned reactor, behind the reactor start-up, pH value is maintained 6.0～7.0 naturally by volatile acid and the basicity of acid-producing bacteria in the reactor and generation thereof in the reactor, does not need to add the soda acid adjusting again;
3, the mud-water separation of mud behind the acidication
The muddy water mixed solution that is rich in volatile acid that step 2 is discharged enters settling tank and carries out mud-water separation, and the settling tank supernatant liquor reclaims the carbon source as Biological Nutrient Removal technique, and the waste sludge of precipitation directly discharges.
Wherein, to enter the hydraulic detention time that settling tank carries out mud-water separation be 1～2h to muddy water mixed solution.
The invention provides a kind of method of little oxygen hydrolysis acidification mud, with the method treatment plant's mud of disposing of sewage, can suppress the growth of methanobacteria, the stability and the mud that improve the sludge hydrolysis, acidification treatment system produce the acid amount, so that mud at utmost obtains minimizing and stabilization treatment, the advantage of the method is mainly reflected in the following aspects simultaneously:
1, little oxygen hydrolysis acidization treatment plant's mud of disposing of sewage is simple to operate, in reactor, adopt pneumatic blending and mechanical stirring, two kinds of alr modes carry out simultaneously, every interval 40～60min stirs once, such alr mode has improved the settling ratio of mud, has prolonged the time of mud hybrid reaction, the more important thing is the growth that has suppressed methanobacteria, improve the output of mud volatile acid, increased the stability of system's operation.
2, little oxygen hydrolysis acidization can operate at normal temperatures, does not need heating and airtight, does not need to add in addition the pH value of soda acid conditioned reaction device, and operational condition is simplified.
3, sludge of sewage treatment plant belongs to the solid waste of sewage work, little oxygen hydrolysis acidization treatment plant's mud of disposing of sewage is simple to operate, its tunning acetic acid, propionic acid, butyric acid can be used as the carbon source of bio-denitrifying sewage dephosphorization process denitrifying bacteria, polyP bacteria, reduce the cost of sewage disposal, realize simultaneously the recycling of mud.
4, adopt little oxygen hydrolysis acidization to process high concentration suspended solid mud, not only can obtain desirable volatile acid output, and can realize good VS removal effect, mud produces acid amount 0.11～0.19gVFA/gVS, VS clearance 35%～44%, system run all right, sludge reduction and stabilization effect are good.
5, the mud acid fermentation method of the semicontinuous operation reactor of the inventive method and employing compares, and is stable, produces sour amount and can improve 38%～50%, and concrete comparative data sees Table 1.
Embodiment
Embodiment 1
Reactor for hydrolysis and acidification adopts sequencing batch reactor, and sewage disposal plant aeration tank returned sluge is seeded in the sequencing batch reactor, and the seed sludge amount is 60% of reactor volume.After the inoculation, add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending under the normal temperature in sequencing batch reactor, the two carries out simultaneously, and every interval 60min stirs once, each churning time 5min, mechanical stirring intensity 10W/m
3, the air capacity 0.06m of pneumatic blending
3/ m
3The pond holds min, to keep in the reactor dissolved oxygen DO as little oxygen condition of 0.4mg/L.The cultivation of acid-producing bacteria domestication generally needs 7～14 days, spoil disposal not in the culturing process, every day stop to stir and staticly settle 1h after discharge supernatant liquor, replenish again simultaneously and enter isopyknic carbohydrate organic waste water, above cyclical operation.The COD concentration and the volume that add carbohydrate organic waste water every day are determined by organic loading rate and hydraulic detention time, organic loading rate employing 3gCOD/Ld, hydraulic detention time 3d.Treat that volatile acid concentration reaches more than the 3000mg/L in the reactor for hydrolysis and acidification, the cultivation domestication of acid-producing bacteria finishes.
After acid-producing bacteria is cultivated domestication well, with the enter mud of sludge of sewage treatment plant as the sequencing batch reactor that contains the acid-producing bacteria that above-mentioned cultivation tames, adopt semicontinuous operation scheme, every day mud after the processing of the instantaneous discharge certain volume in the middle part of sequencing batch reactor mud mixture, and enter isopyknic sludge of sewage treatment plant from the top of reactor.To stir in advance 5min before each spoil disposal.Every day, the instantaneous sludge quantity that enters reactor was controlled by solid retention time, and solid retention time represents with SRT, and the sequencing batch reactor volume is V, the m of unit
3, the sludge quantity that adds every day is V
1, the m of unit
3, V=SRT * V
1The present embodiment control enters the VS 15g/L of mud, VS/TS=0.51, SRT 6d, alr mode during sludge hydrolysis, acidification is cultivated the alr mode in domestication stage with above-mentioned acid-producing bacteria, 20 ℃ of temperature, pH value in the reactor relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.5, does not need to regulate in addition control.
Enter settling tank behind the mud mixture of discharging, precipitation 1h, settling tank supernatant liquor are as the carbon sources recycling utilization of Biological Nutrient Removal technique, and the waste sludge that precipitates discharges.
Embodiment 2
Mixing chamber interval 60min, churning time 7min, SRT 4d, the other the same as in Example 1.
Embodiment 3
Mixing chamber interval 40min, churning time 5min enters the VS 20g/L of mud, VS/TS=0.55, pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.0, the other the same as in Example 1 in the SRT 3d, reactor.
Volatile acid concentration 2693mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.14gVFA/gVS, VS clearance 35%.
Embodiment 4
Mixing chamber interval 40min, churning time 10min enters the VS 20g/L of mud, SRT 4d, the other the same as in Example 3.
Volatile acid concentration 2965mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.15gVFA/gVS, VS clearance 39%.
Embodiment 5
Mixing chamber interval 50min, churning time 10min enters the VS 25g/L of mud, SRT 3d, 23 ℃ of temperature, pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.5, the other the same as in Example 3 in the reactor.
Embodiment 6
Mixing chamber interval 40min, churning time 10min enters the VS 25g/L of mud, SRT 4d, 25 ℃ of temperature, pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 7.0, the other the same as in Example 1 in the reactor.
Embodiment 7
Reactor for hydrolysis and acidification adopts sequencing batch reactor, and the aerobic sludge of sewage work is seeded in the sequencing batch reactor, and the seed sludge amount is 70% of reactor volume.After the inoculation, add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending under the normal temperature in sequencing batch reactor, the two carries out simultaneously, and every interval 60min stirs once, each churning time 7min, mechanical stirring intensity 12W/m
3, the air capacity 0.11m of pneumatic blending
3/ m
3The pond holds min, to keep in the reactor dissolved oxygen DO as little oxygen condition of 0.6mg/L.The cultivation of acid-producing bacteria domestication generally needs 7～14 days, spoil disposal not in the culturing process, every day stop to stir and staticly settle 0.5h after discharge supernatant liquor, replenish again simultaneously and enter isopyknic carbohydrate organic waste water, above cyclical operation.The COD concentration and the volume that add carbohydrate organic waste water every day are determined by organic loading rate and hydraulic detention time, organic loading rate employing 3gCOD/Ld, hydraulic detention time 4d.Treat that volatile acid concentration reaches more than the 3000mg/L in the reactor for hydrolysis and acidification, the cultivation domestication of acid-producing bacteria finishes.
After acid-producing bacteria is cultivated domestication well, with the enter mud of sludge of sewage treatment plant as the sequencing batch reactor that contains the acid-producing bacteria that above-mentioned cultivation tames, adopt semicontinuous operation scheme, every day instantaneous discharge certain volume processing after mud mud mixture and enter isopyknic sludge of sewage treatment plant.To stir in advance 8min before each spoil disposal.Control enters the VS 15g/L of mud, VS/TS=0.6, SRT 6d, alr mode during sludge hydrolysis, acidification is cultivated the alr mode in domestication stage with above-mentioned acid-producing bacteria, 23 ℃ of temperature, pH value in the reactor relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.5, does not need to regulate in addition control.
Enter settling tank behind the mud mixture of discharging, precipitation 1.5h, settling tank supernatant liquor are as the carbon sources recycling utilization of Biological Nutrient Removal technique, and the waste sludge that precipitates discharges.
Embodiment 8
Churning time 5min, SRT 4d, other is with embodiment 7.
Embodiment 9
Mixing chamber interval 50min, SRT 3d, 20 ℃ of temperature, the pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.38 in the reactor, and other is with embodiment 7.
Volatile acid concentration 2425mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.16gVFA/gVS, VS clearance 38%.
Embodiment 10
Mixing chamber interval 60min, churning time 10min enters the VS 20g/L of mud, SRT 4d, other is with embodiment 9.
Embodiment 11
Mixing chamber interval 40min, churning time 5min, the pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.42, the other the same as in Example 10 in the SRT 6d, reactor.
Volatile acid concentration 3665mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.18gVFA/gVS, VS clearance 36%.
Embodiment 12
Mixing chamber interval 50min, 25 ℃ of temperature enter the VS 25g/L of mud, and pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.46 in the reactor, and other is with embodiment 7.
Volatile acid concentration 4618mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.19gVFA/gVS, VS clearance 36%.
Embodiment 13
Enter the VS 20g/L of mud, the pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.91, the other the same as in Example 12 in the SRT 4d, reactor.
Volatile acid concentration 3391mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.17gVFA/gVS, VS clearance 38%.
Embodiment 14
Reactor for hydrolysis and acidification adopts sequencing batch reactor, the aerobic sludge of sewage work is inserted in the sequencing batch reactor inoculate, and the seed sludge amount is 70% of reactor volume.After the inoculation, add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending under the normal temperature in sequencing batch reactor, the two carries out simultaneously, and every interval 60min stirs once, each churning time 10min, mechanical stirring intensity 15W/m
3, the air capacity 0.14m of pneumatic blending
3/ m
3The pond holds min, to keep in the reactor dissolved oxygen DO as little oxygen condition of 0.8mg/L.The cultivation of acid-producing bacteria domestication generally needs 7～14 days, spoil disposal not in the culturing process, every day stop to stir and staticly settle 1h after discharge supernatant liquor, replenish again simultaneously and enter isopyknic carbohydrate organic waste water, above cyclical operation.The COD concentration and the volume that add carbohydrate organic waste water every day are determined by organic loading rate and hydraulic detention time, organic loading rate employing 4gCOD/Ld, hydraulic detention time 3d.Treat that volatile acid concentration reaches more than the 3000mg/L in the reactor for hydrolysis and acidification, the cultivation domestication of acid-producing bacteria finishes.
After acid-producing bacteria is cultivated domestication well, with the enter mud of sludge of sewage treatment plant as the sequencing batch reactor that contains the acid-producing bacteria that above-mentioned cultivation tames, adopt semicontinuous operation scheme, every day instantaneous discharge certain volume processing after mud mud mixture and enter isopyknic sludge of sewage treatment plant.To stir in advance 10min before each spoil disposal.Control enters the VS 15g/L of mud, VS/TS=0.7, SRT 6d, alr mode during sludge hydrolysis, acidification is cultivated the alr mode in domestication stage with above-mentioned acid-producing bacteria, 20 ℃ of temperature, pH value in the reactor relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.0, does not need to regulate in addition control.
Enter settling tank behind the mud mixture of discharging, precipitation 2h, settling tank supernatant liquor are as the carbon sources recycling utilization of Biological Nutrient Removal technique, and the waste sludge that precipitates discharges.
Embodiment 15
Churning time 7min, SRT 4d, the other the same as in Example 14.
Embodiment 16
Churning time 5min, SRT 3d, the other the same as in Example 14.
Embodiment 17
Mixing chamber interval 50min, churning time 7min enters the VS 20g/L of mud, SRT 4d, 23 ℃ of temperature, pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.5, the other the same as in Example 14 in the reactor.
Embodiment 18
Mixing chamber interval 40min, the pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.94,25 ℃ of temperature, the other the same as in Example 17 in the SRT 3d, reactor.
Volatile acid concentration 3861mg/L in the muddy water mixed solution after acidication is processed, mud produce acid amount 0.19gVFA/gVS, VS clearance 35%.
Embodiment 19
Mixing chamber interval 50min, churning time 5min enters the VS 25g/L of mud, and pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 6.5, the other the same as in Example 18 in the SRT 4d, reactor.
Embodiment 20
Mixing chamber interval 60min, the pH value relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to be maintained 7.0, the other the same as in Example 18 in the churning time 5min, reactor.
Embodiment 21
Reactor for hydrolysis and acidification adopts sequencing batch reactor, sewage disposal plant aeration tank returned sluge is inserted in the sequencing batch reactor inoculate, and the seed sludge amount is 50% of reactor volume.After the inoculation, add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending under the normal temperature in sequencing batch reactor, the two carries out simultaneously, and every interval 60min stirs once, each churning time 5min, mechanical stirring intensity 15W/m
3, the air capacity 0.14m of pneumatic blending
3/ m
3The pond holds min, to keep in the reactor dissolved oxygen DO as little oxygen condition of 0.8mg/L.The cultivation of acid-producing bacteria domestication generally needs 7～14 days, spoil disposal not in the culturing process, every day stop to stir and staticly settle 0.5h after discharge supernatant liquor, replenish again simultaneously and enter isopyknic carbohydrate organic waste water, above cyclical operation.The COD concentration and the volume that add carbohydrate organic waste water every day are determined by organic loading rate and hydraulic detention time, organic loading rate employing 4gCOD/Ld, hydraulic detention time 4d.Treat that volatile acid concentration reaches more than the 3000mg/L in the reactor for hydrolysis and acidification, the cultivation domestication of acid-producing bacteria finishes.
After acid-producing bacteria is cultivated domestication well, with the enter mud of sludge of sewage treatment plant as the sequencing batch reactor that contains the acid-producing bacteria that above-mentioned cultivation tames, adopt semicontinuous operation scheme, every day instantaneous discharge certain volume processing after mud mud mixture and enter isopyknic sludge of sewage treatment plant.To stir in advance 10min before each spoil disposal.Control enters the VS 15g/L of mud, VS/TS=0.65, SRT 6d, alr mode during sludge hydrolysis, acidification is cultivated the alr mode in domestication stage with above-mentioned acid-producing bacteria, 20 ℃ of temperature, pH value in the reactor relies on volatile acid and the basicity of the interior acid-producing bacteria of reactor and generation thereof naturally to maintain 6.5, does not need to regulate in addition control.
Enter settling tank behind the mud mixture of discharging, precipitation 2h, settling tank supernatant liquor are as the carbon sources recycling utilization of Biological Nutrient Removal technique, and the waste sludge that precipitates discharges.
Claims (3)
1. little oxygen hydrolysis acidification mud method may further comprise the steps:
A), in reactor for hydrolysis and acidification, inoculate the sewage work's aerobic sludge that accounts for reactor volume 50%～70%, and add carbohydrate organic waste water as substratum, carry out mechanical stirring and pneumatic blending, the two carries out simultaneously, every interval 40～60min stirs once, each churning time 5～10min, mechanical stirring intensity 10～15W/m
3, pneumatic blending air capacity 0.06～0.14m
3/ (m
3The pond holds min), to keep in the reactor for hydrolysis and acidification dissolved oxygen DO as little oxygen condition of 0.4～0.8mg/L; Spoil disposal not in cultivating the domestication process, an intermittently discharged supernatant liquor fills into isopyknic carbohydrate organic waste water after discharging supernatant liquor again, stops to stir precipitation 0.5-1h, cyclical operation before row's supernatant liquor; The COD concentration and the volume that add carbohydrate organic waste water every day are determined organic loading rate 3～4gCOD/(Ld), hydraulic detention time 3～4d by organic loading rate and hydraulic detention time; Treat in the reactor for hydrolysis and acidification that volatile acid concentration reaches 3000mg/L when above, finishes the cultivation of acid-producing bacteria and tames;
B), with volatile solid concentration 15～25g/L, volatile solid concentration/total solid concentration ratio enters mud greater than 0.5 sludge of sewage treatment plant conduct, entering step a) has cultivated in the reactor of having tamed acid-producing bacteria, carry out mechanical stirring and pneumatic blending, the two carries out simultaneously, every interval 40～60min stirs once, each churning time 5～10min, mechanical stirring intensity 10～15W/m
3, pneumatic blending air capacity 0.06～0.14m
3/ (m
3The pond holds min); Discharge after entering the solid retention time that mud in the reactor satisfies 3～6d, will stir 5～10min before the spoil disposal every day, discharges the muddy water mixed solution that is rich in volatile acid, fills into isopyknic new sludge of sewage treatment plant, cyclical operation simultaneously again;
C), step b) muddy water mixed solution that is rich in volatile acid of discharging enters settling tank and carries out mud-water separation, the settling tank supernatant liquor reclaims the carbon source as Biological Nutrient Removal technique, the waste sludge of precipitation directly discharges.
2. little oxygen hydrolysis acidification mud method according to claim 1 is characterized in that the acidifying that is hydrolyzed of described reactor for hydrolysis and acidification under 20 ℃～25 ℃.
3. little oxygen hydrolysis acidification mud method according to claim 1 is characterized in that it is 1～2h that described muddy water mixed solution enters the hydraulic detention time that settling tank carries out mud-water separation.
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| CN106186303A (en) * | 2016-08-15 | 2016-12-07 | 桂林市福泰建材有限责任公司 | One way of life method of wastewater treatment |
| CN108046554A (en) * | 2017-12-14 | 2018-05-18 | 北京工业大学 | The method that one Yeasts strengthen the micro- oxygen digestion production volatile fatty acid of residual active sludge room temperature |
| CN108128987A (en) * | 2018-02-01 | 2018-06-08 | 成都市卓新实业有限公司 | A kind of Porta Potti sewage water treatment method and its system |
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| CN110467323B (en) * | 2019-09-17 | 2022-03-25 | 昆明理工大学 | Method for rapidly releasing internal carbon source by cooperatively treating sludge through high-temperature micro-oxygen and micro-current |
| CN114291990B (en) * | 2021-12-30 | 2022-12-09 | 南京大学 | Device for improving hydrolysis acidification effect of excess sludge with high efficiency and low consumption and operation method thereof |
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| 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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