CN1559940A - Method for accelerating sludge anaerobic digest speed rate of sewage plant - Google Patents
Method for accelerating sludge anaerobic digest speed rate of sewage plant Download PDFInfo
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- CN1559940A CN1559940A CNA2004100140821A CN200410014082A CN1559940A CN 1559940 A CN1559940 A CN 1559940A CN A2004100140821 A CNA2004100140821 A CN A2004100140821A CN 200410014082 A CN200410014082 A CN 200410014082A CN 1559940 A CN1559940 A CN 1559940A
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- Prior art keywords
- anaerobic digestion
- mud
- sewage plant
- reaction
- speed according
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- 239000010865 sewage Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000010802 sludge Substances 0.000 title claims description 43
- 230000029087 digestion Effects 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 230000035484 reaction time Effects 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 4
- 230000001133 acceleration Effects 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 238000011081 inoculation Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000012216 screening Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 244000052616 bacterial pathogen Species 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000019621 digestibility Nutrition 0.000 description 1
- 239000005446 dissolved organic matter Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method of accelerating anaerobic digestion of mud in sewage treatment plant, having short reaction cycle and low cost, and simultaneously able to increase gas output and having good economic benefits. Its concrete steps: screening the mud taken from the sewage treatment plant by a 5-50 mm-sized sieve to eliminate larger impurity particles; making irradiation treatment by higher-penetrability gama-ray and controlling the irradiation quantity absorbed by the mud at 0-30kGy; then inoculating the mud with inoculating mud in the ratio of 1-5 to 1 and making anaerobic digestion reaction, where the stirring rate controlled at 70-120 r/min, the reaction temperature controlled at 20-60 deg.C and the reaction time 10-20 days. The technique can be used in a mud treatment system in sewage treatment plant.
Description
Technical field
The present invention relates to a kind of technology of quickening sewage plant sludge anaerobic digestion speed, this technology can be widely used in mud treatment system in sewage treatment plant.
Background technology
Sewage plant sludge is meant the flocculent substance that produces in the water treatment procedure, mainly is made up of organism, organism and a large amount of materials such as moisture.Contain elements such as a large amount of organism and N, P in the mud, also contain objectionable impuritiess such as heavy metal, hardly degraded organic substance and pathogenic bacteria simultaneously, if let alone discharging then can cause serious environmental to pollute.At present, the many countries method commonly used that comprises China mainly contains agriculture utilization, landfill, burning disposal etc.
In general, sludge yield by the processing sewage quantity 1～3%.At present, the annual discharging of China sludge quantity is about 5.0 * 10
6T, and have ever-increasing trend.A large amount of accumulation of mud have brought great difficulty for its follow-up processing and disposing task.Anaerobic digestion is traditional sludge stabilization process.Compare with other method, this method has the volume that can reduce mud, kill pathogenic bacteria, reduce volatile content, reduce stink and improve advantages such as dewatering, can also produce methane gas and the recovery part energy simultaneously, thereby cut down the consumption of energy.Thereby anaerobic sludge digestion technology is extensively adopted by sewage work always.
Anaerobic digestion is divided into hydrolysis, acidifying, product acid, produces 4 steps of methane, wherein, hydrolysing step speed is slow, thereby has caused shortcomings such as the anaerobic sludge digestion residence time long (generally needing 30-40 days), digestibility be low, and this certainly will make the sludge digestion device very huge.Expensive fixed investment and big floor space make many Sewage Plant can't build the sludge digestion device, thereby have brought great trouble for the follow-up disposing task of mud.Thereby accelerate sludge anaerobic digestion speed improves the focus that the sludge digestion rate then becomes people's Recent study.
Summary of the invention
The present invention is directed to long deficiency of anaerobic sludge digestion cycle in the prior art, a kind of method of quickening sewage plant sludge anaerobic digestion speed is provided, this method is short reaction time, and cost is low, can increase gas production rate simultaneously, has good economic benefit.
The objective of the invention is to realize by following measure:
A kind of method of quickening sewage plant sludge anaerobic digestion speed, its concrete steps are:
Step 1: the excess sludge size of mesh of taking from Sewage Plant is that the sieve of 5-50mm sieves, and makes the wherein bigger Impurity removal of particle;
Step 2: with the gamma-radiation with higher penetration performance it is carried out radiation treatment, the irradiation dose that mud is absorbed is controlled at 0～30kGy;
Step 3: mud behind the irradiation and seed sludge are in 1-5: carry out the anaerobic digestion reaction after 1 the ratio inoculation, its stirring velocity is controlled at 70-120 rev/min, and temperature of reaction is 20-60 ℃, reaction times 10-20 days.
Purpose of the present invention can also realize by following measure:
In the step 1 behind the preferably first mixing after sieve, best size of mesh is 10-20mm
Adopt in the generation source of gamma-radiation described in the step 2
137Cs or
60Co.
Mud in the step 3 behind the irradiation and seed sludge are best in 1-3: 1 ratio is inoculated.
Postvaccinal mud enters the static digestion reactor of anaerobism and carries out the anaerobic digestion reaction in the step 3.
The stirring velocity optimum control is at 80-100 rev/min in the step 3.
Temperature of reaction the best is 30-50 ℃ in the step 3.
The temperature of anaerobic digestion reaction and stirring intensity adopt water bath with thermostatic control vibrator or constant temperature blender with magnetic force control in the step 3.
The beneficial effect that the present invention has compared to existing technology:
The invention provides a kind of method of brand-new acceleration sewage plant sludge anaerobic digestion speed, specifically, utilize gamma-radiation that the excess sludge of sewage work is carried out pre-treatment exactly with higher penetration performance, improve the biodegradability of mud, make it to be more conducive to hydrolysis and anaerobic digestion, thereby improve the anaerobic digestion speed of mud.After the gamma-radiation radiation treatment, the pH value of mud decreases, but still meets the requirement of anaerobic digestion, regulates the pH value so need not add allogenic material.
Gamma-radiation be meant radioelement (as
137Cs and
60Co) a kind of electromagnetic quantities wavelet that is similar to light that produces in decay process has stronger photon energy and short wavelength.After gamma-radiation enters mud, 10
-7Second in mud in water molecules, cotton-shaped particulate matter and microorganism etc. react, by " directly effect " or " indirect action ", reduce mud granule thing size, break the microbial cell wall, improve the solubility organic constituent, quicken anaerobic hydrolysis speed, thus can accelerate sludge anaerobic digestion speed.
At irradiation dose is under the treatment condition of 0～30kGy, in identical anaerobism in the residence time, the clearance of total solids, total volatile solid(s) (TVS), suspension volatile solid has all improved 5～10%, and gas production rate has increased by 5～45%, can shorten (only needing 10-20 days) reaction time greatly.As seen, gamma-radiation is used for the anaerobic sludge digestion pre-treatment, can improve anaerobic sludge digestion speed, reduces the digestion facility capacity, saves fixed investment, but also can obtain more energy gas, has good economic benefit.In addition, compare with additive method, the present invention also have do not add allogenic material, safe in utilization, kill pathogenic bacteria and reduce advantages such as pollutent toxicity, so have positive environmental benefit.
Therefore, the sludge treatment technique with the present invention is used for municipal wastewater treatment plant has good economic benefit and environmental benefit, wide application prospect.
Embodiment
Below further specify the present invention by example:
Embodiment 1: test mud is the excess sludge of municipal wastewater treatment plant, water ratio about 98%, median size 85 μ m.Mud mixes the back and crosses the 50mm sieve to reject the bigger impurity (as the plastics bag in the mud, branch, rotted leaf, masonry etc.) of particle diameter.Warp
60(source strength is 500,000Ci), under lower irradiation dose (2.48kGy) mud is carried out radiation treatment, and the soluble chemical oxygen requirement increases by 79% after the radiation, and median size is decreased to 59.22 μ m in the Co source.Mud behind the irradiation and seed sludge enter the static digestion reactor of anaeration in normal temperature, reactor volume 500ml according to 1: 1 ratio.The temperature of anaerobic reaction and stirring intensity adopt the control of water bath with thermostatic control vibrator, and temperature of reaction is 35 ± 1 ℃, and stirring velocity is 80 ± 10 rev/mins.20 days anaerobic reaction cycles, during index such as periodic measurement gas production rate, dissolved organic matter and solids content.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 3,5,10,14,16,20 day gas production rate increment rate is respectively 42%, 34%, 23%, 17%, 14%, 13%, 9%.
Embodiment 2: change the irradiation intensity among the embodiment 1 into 6.51kGy, other operational condition is constant.The soluble chemical oxygen requirement increases by 277%, and median size is decreased to 60.64 μ m.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 5,10,14,20 day gas production rate increment rate is respectively 21%, 18%, 23%, 19%, 20%.
Embodiment 3: change the irradiation intensity among the embodiment 1 into 11.24kGy, other operational condition is constant.The soluble chemical oxygen requirement increases by 423%, and median size is decreased to 55.61 μ m.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 3,5,10,14,16,20 day gas production rate increment rate is respectively 33%, 40%, 38%, 41%, 35%, 34%, 36%.
Embodiment 4: change the irradiation intensity among the embodiment 1 into 19.40kGy, the anaerobic digestion reaction times changes 16 days into, and other operational condition is constant.The soluble chemical oxygen requirement increases by 452%, and median size is decreased to 56.03 μ m.After reaction finished, (0kGy) compared with control experiment, and the 3rd, 5,10,14,16 day gas production rate increment rate is respectively 23%, 29%, 41%, 26%, 24%.
Embodiment 5: change the size of mesh among the embodiment 1 into 35mm, irradiation intensity changes 28.1kGy into, and the soluble chemical oxygen requirement increases by 507%, and median size is decreased to 50.64 μ m.Mud behind the irradiation and seed sludge enter the static digestion reactor of anaeration in normal temperature in 3: 1 ratio.The temperature of anaerobic reaction and stirring intensity adopt constant temperature blender with magnetic force control, and temperature of reaction is 40 ± 1 ℃, and stirring velocity is 90 ± 10 rev/mins, and the anaerobic digestion reaction times changes 12 days into, and other operational condition is constant.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 5,10,12 day gas production rate increment rate is respectively 31%, 22%, 20%, 19%.
Embodiment 6: change the size of mesh among the embodiment 1 into 12mm, irradiation intensity changes 24.51kGy into, and the soluble chemical oxygen requirement increases by 480%, and median size is decreased to 48.68 μ m.Mud behind the irradiation and seed sludge enter the static digestion reactor of high temperature anaerobic in 5: 1 ratio.The temperature of anaerobic reaction and stirring intensity adopt the control of water bath with thermostatic control vibrator, and temperature of reaction is 55 ± 1 ℃, and stirring velocity is 110 ± 10 rev/mins, and the anaerobic digestion reaction times changes 10 days into, and other operational condition is constant.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 5,8,10 day gas production rate increment rate is respectively 45%, 38%, 35%, 34%.
Embodiment 7: change the size of mesh among the embodiment 1 into 18mm, irradiation intensity changes 19.4kGy into, and the soluble chemical oxygen requirement increases by 287%, and median size is decreased to 55.38 μ m.Mud behind the irradiation and seed sludge enter the static digestion reactor of anaeration in normal temperature in 4: 1 ratio.Other operational condition is constant.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 5,10,14,20 day gas production rate increment rate is respectively 23%, 19%, 22%, 20%, 21%.
Embodiment 8: change the size of mesh among the embodiment 1 into 8mm, adopt in irradiation generation source
137(source strength is 500 to Cs, and 000Ci), irradiation intensity is 10.2kGy, and the soluble chemical oxygen requirement increases by 162%, and median size is decreased to 60.15 μ m.Mud behind the irradiation and seed sludge enter the static digestion reactor of anaerobism in 2: 1 ratio, and temperature of reaction is 25 ± 1 ℃.Other operational condition is constant.After reaction finished, (0kGy) compared with control experiment, and the 2nd, 5,10,14,20 day gas production rate increment rate is respectively 33%, 29%, 22%, 20%, 19%.
Claims (9)
1, a kind of method of quickening sewage plant sludge anaerobic digestion speed, its concrete steps are:
Step 1: the excess sludge size of mesh of taking from Sewage Plant is that the sieve of 5-50mm sieves, and makes the wherein bigger Impurity removal of particle;
Step 2: with the gamma-radiation with higher penetration performance it is carried out radiation treatment, the irradiation dose that mud is absorbed is controlled at 0～30kGy;
Step 3: mud behind the irradiation and seed sludge are in 1-5: carry out the anaerobic digestion reaction after 1 the ratio inoculation, its stirring velocity is controlled at 70-120 rev/min, and temperature of reaction is 20-60 ℃, reaction times 10-20 days.
2, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that in the step 1 behind the mud elder generation mixing after sieve.
3, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that rejecting the used size of mesh of impurity in the step 1 is 10-20mm.
4, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that the generation source of gamma-radiation described in the step 2 is adopted
137Cs or
60Co.
5, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1, it is characterized in that in the step 3 that the mud behind the irradiation and seed sludge are in 1-3: 1 ratio is inoculated.
6, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that in the step 3 that postvaccinal mud enters the static digestion reactor of anaerobism and carries out the anaerobic digestion reaction.
7, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that stirring velocity is controlled at 80-100 rev/min in the step 3.
8, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that temperature of reaction is 30-50 ℃ in the step 3.
9, the method for acceleration sewage plant sludge anaerobic digestion speed according to claim 1 is characterized in that the temperature of anaerobic digestion reaction in the step 3 and stirring intensity adopt water bath with thermostatic control vibrator or constant temperature blender with magnetic force control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100140821A CN1228259C (en) | 2004-02-17 | 2004-02-17 | Method for accelerating sludge anaerobic digest speed rate of sewage plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100140821A CN1228259C (en) | 2004-02-17 | 2004-02-17 | Method for accelerating sludge anaerobic digest speed rate of sewage plant |
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| Publication Number | Publication Date |
|---|---|
| CN1559940A true CN1559940A (en) | 2005-01-05 |
| CN1228259C CN1228259C (en) | 2005-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100140821A Expired - Fee Related CN1228259C (en) | 2004-02-17 | 2004-02-17 | Method for accelerating sludge anaerobic digest speed rate of sewage plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320677A (en) * | 2011-08-29 | 2012-01-18 | 上海大学 | Device for treating waste water by electron beam irradiation method |
| CN104445849A (en) * | 2014-12-12 | 2015-03-25 | 济南大学 | Method for producing short-chain fatty acid employing combined pretreatment of activated sludge |
| CN104986933A (en) * | 2015-01-27 | 2015-10-21 | 西北农林科技大学 | Method for increasing biogas yield and methane content |
-
2004
- 2004-02-17 CN CNB2004100140821A patent/CN1228259C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320677A (en) * | 2011-08-29 | 2012-01-18 | 上海大学 | Device for treating waste water by electron beam irradiation method |
| CN102320677B (en) * | 2011-08-29 | 2013-05-08 | 上海大学 | Device for treating waste water by electron beam irradiation method |
| CN104445849A (en) * | 2014-12-12 | 2015-03-25 | 济南大学 | Method for producing short-chain fatty acid employing combined pretreatment of activated sludge |
| CN104445849B (en) * | 2014-12-12 | 2016-04-20 | 济南大学 | A kind of combined pretreatment active sludge produces the method for short chain fatty acid |
| CN104986933A (en) * | 2015-01-27 | 2015-10-21 | 西北农林科技大学 | Method for increasing biogas yield and methane content |
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| Publication number | Publication date |
|---|---|
| CN1228259C (en) | 2005-11-23 |
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