CN102531303A - Method for improving dry process fermenting property of municipal sludge by sludge modification - Google Patents
Method for improving dry process fermenting property of municipal sludge by sludge modification Download PDFInfo
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- CN102531303A CN102531303A CN2012100129009A CN201210012900A CN102531303A CN 102531303 A CN102531303 A CN 102531303A CN 2012100129009 A CN2012100129009 A CN 2012100129009A CN 201210012900 A CN201210012900 A CN 201210012900A CN 102531303 A CN102531303 A CN 102531303A
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Abstract
The invention belongs to the field of resource treatment of solid wastes and relates to a method for improving dry process fermenting property of municipal sludge by sludge modification. The method comprises the following steps of: (1) heating treatment: heating dewatered sludge; (2) hydrogen peroxide oxidation treatment: adding hydrogen peroxide to heated dewatered sludge, uniformly mixing for oxidation treatment, and maintaining the heating temperature of the step (1); and (3) anaerobic fermentation: adjusting the temperature of the sludge treated in the step (2) to 55-60 DEG C, then adding to an anaerobic fermentation tank, uniformly mixing with anaerobic fermentation sludge and carrying out anaerobic fermentation treatment in the fermentation tank. In the method provided by the invention, harmful oxidation byproducts are not generated, the required equipment is simple, the operation and maintenance are convenient and the investment is saved. Compared with the sludge which is not treated with hydrogen peroxide, the sludge treated with hydrogen peroxide can provide the same gas yield within an obviously shortened time.
Description
Technical field
The invention belongs to useless admittedly resource utilization field, relate to a kind of method of improving municipal sludge dry method leavening property through sludge modification.
Background technology
Be accompanied by the rapid lifting of wastewater treatment in China ability, the mud generation increases substantially.According to estimates, the wet mud YO of China will break through 3,000 ten thousand tons very soon.And according to the up-to-date investigation data presentation of China, the actual treatment disposal rate of current mud even less than 30%.This will have a strong impact on China and build the effect that the municipal sewage plant cuts down water pollutant, and these mud possibly cause secondary pollution to underground water, soil etc., become the threat of environmental safety and public health.China's energy structure is main with coal and oil for a long time, and energy supply and demand contradiction becomes increasingly conspicuous, and energy deficiency has become the bottleneck of the restriction national economic development.Reclaiming biomass energy-biogas with the sludge anaerobic fermentation, is the route that meets low carbon cycle Sustainable development, not only reaches minimizing, stabilization and safe target, reaches energy maximization and resource optimizing simultaneously.
According to the solids content (TS) of material in the anaerobic fermentation tank, anaerobic fermentation technology can be divided into wet type fermentation (TS≤12%) and dry type fermentation (TS>=20%) two kinds, and the wet type fermentation is produced the natural pond in municipal sludge (TS is 2-3%) digestion, and has been applied.Compare with mud wet method anaerobically fermenting, the difficult point of mud dry method anaerobically fermenting is: (1) dewatered sludge water ratio is low, viscosity factor is high, TS concentration high, is first valve state, causes the matrix viscosity of reaction big; (2) the dewatered sludge solid content is high, and great number of organic matters is wrapped in the microbe body in the mud, is unfavorable for the generation of acidication process, therefore, causes loose contact between reaction substrate, intermediate product and the anaerobion, is difficult to start or to produce the natural pond ability low.The problems referred to above are to hinder the major technique bottleneck of the dry method anaerobically fermenting of mud.
In order to improve the biogas output of mud, adoptable pretreatment process has: machinery cracks, Chemical Pretreatment (acid, alkaline purification), ultrasonication, microwave treatment, ozone oxidation etc.But because single pre-treatment, its effect is also not obvious.Therefore present research is made up to multiple pretreatment process often, comes obviously to improve biogas output.As: alkali+UW (CN101565262A), microwave+alkaline thermal hydrolysis preprocessing means such as (CN 101524699A).And these pretreatment processs mainly are applicable to the mud that solid content is lower.Characteristics such as the dewatered sludge big for viscosity, that flowability is poor can adopt thermal hydrolysis pre-treatment (CN101948228A), and it is higher to exist the investment construction working cost, and treatment effect is not remarkable.About adopting thermal treatment+hydrogen peroxide combination pretreatment process, be used to improve the method for municipal sludge dry method anaerobically fermenting performance, do not appear in the newspapers both at home and abroad.
Hydrogen peroxide is a kind of than strong oxidizer; It can destroy microorganisms cell walls, discharge in the cell organic, in the process of hydrogen peroxide generation oxidation; The a large amount of difficult for biological degradation that produces stripping in the hydroxyl radical free radical degraded mud is organic, improves organic biodegradability in the mud.Katalase is a kind of terminal respiratory enzyme, is present in all active aerobic microbiologicals, and it can be water and oxygen molecule with hydrogen peroxide decomposition, and this kind of enzyme can play the certain protection effect by pair cell.It is active that katalase can keep in the pH of broad scope (3.0-9.0), but responsive relatively for temperature, surpasses 40 ℃ of loss of activity gradually, therefore, earlier mud is heated to the temperature of hydrogen peroxide enzyme deactivation, effectively brings into play the oxygenizement of hydrogen peroxide.
Summary of the invention
The objective of the invention is to the defective of prior art and a kind of method of improving municipal sludge dry method leavening property through sludge modification is provided.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind ofly improve the method for municipal sludge dry method leavening property, comprise following steps through sludge modification:
(1) heat treated: dewatered sludge is heated;
(2) hydrogen peroxide oxidation: hydrogen peroxide is joined in the dewatered sludge after the heating, and mix, carry out oxide treatment, keep the Heating temperature of step (1);
(3) anaerobically fermenting: the temperature of the mud of handling in the regulating step (2), then it is added in the anaerobic fermentation tank, mix the back with anaerobically fermenting mud and in fermentor tank, carry out fermentative processing.
The solid content of dewatered sludge is 15-20% in the described step (1), preferred 20%.
Heating temperature in the described step (1) is 45-90 ℃, preferred 60 ℃.
The concentration of hydrogen peroxide is 10-30% in the described step (2), preferred 30%.
The add-on of the hydrogen peroxide in the described step (2) is H
2O
2The ratio of/TCOD (TCOD is a COD) is 0.3-2.0, preferred 1-2.0.
Temperature hold-time in the described step (2) is 10-30min.
Anaerobically fermenting temperature in the described step (3) is 50-60 ℃, and the temperature fluctuation range of each fermentation is between ± 2 ℃.
In the described step (3), every day continuous feeding and discharging, the inlet amount of the mud that step (2) was handled is the 1/10-1/20 of anaerobically fermenting sludge volume in the fermentor tank.
Temperature regulation with mud in the described step (3) is 55-60 ℃.
In the described step (3), the residence time of mud mixture is 10-20 days in the fermentor tank.
The present invention has the following advantages:
1. the deleterious oxidized byproduct that does not produce.
2. with other oxygenants the pretreatment process of mud is compared, like ozone, hydrogen peroxide needs that equipment is simple, convenient operating maintenance, reduce investment outlay.
3. adopt heat+hydrogen peroxide pre-treatment,, improve temperature of reaction through adding thermal material; Effectively utilize the oxygenizement of hydrogen peroxide; Help the anaerobion cell wall rupture, the cellular material stripping, obviously improve in the mud organic biodegradability, significantly improve the output of biogas.
4. with respect to the mud without hydrogen peroxide treatment, reach identical factor of created gase, the required time obviously shortens.
Embodiment
Further specify the present invention through embodiment below:
Embodiment 1:
(1) is that 20% dewatered sludge carries out pre-treatment with solid content, in water-bath, is heated to 65 ℃;
(2) according to H
2O
2/ TCOD ratio is that 1.0 adding hydrogen peroxide adding concentration are 30% H
2O
2In being heated to 65 ℃ dewatered sludge, it is mixed, under 65 ℃ of conditions, react 30min;
(3) be cooled to about 55 ℃ subsequently, the mud of modification is added in the anaerobic fermentation tank of useful volume 10L, make anaerobically fermenting mud and charging thorough mixing in the fermentor tank; Every day continuous feeding and discharging, the inlet amount of the mud that step (2) was handled be in the fermentor tank anaerobically fermenting sludge volume 1/20, inlet amount is 0.5L/d; The control sludge retention time is 20 days; Keeping the interior temperature of charge of reactor drum is 53 ± 2 ℃, in said process, in the continuous feeding and discharging process, controls the whipping appts operating frequency; Stirred 10 minutes, and stopped 10 minutes.
Comparative Examples 1
Same with embodiment 1, just dewatered sludge is without pre-treatment.
Embodiment 1 compares with Comparative Examples 1, and the degradation rate of mud organic substance improves 13% after the pre-treatment, and the unit volume methane production improves 30%.
Embodiment 2:
(1) is that 20% dewatered sludge carries out pre-treatment with solid content, in water-bath, is heated to 65 ℃;
(2) according to H
2O
2/ TCOD ratio is 2.0 adding H
2O
2, adding concentration is 30% H
2O
2In being heated to 65 ℃ dewatered sludge, it is mixed, under 65 ℃ of conditions, react 20min;
(3) be cooled to about 55 ℃ subsequently, the mud of modification is added in the anaerobic fermentation tank of useful volume 10L, make anaerobically fermenting mud and charging thorough mixing in the fermentor tank; Every day continuous feeding and discharging; The inlet amount of the mud that step (2) was handled be in the fermentor tank anaerobically fermenting sludge volume 1/20, inlet amount is 0.5L/d, control sludge retention time be 20 days; Keeping the interior temperature of charge of reactor drum is 53 ± 2 ℃; Control whipping appts operating frequency stirred 10 minutes in said process, stopped 10 minutes.
Comparative Examples 2
Same with embodiment 2, just dewatered sludge is without pre-treatment.
Embodiment 2 compares with Comparative Examples 2, and the degradation rate of mud organic substance improves 18% after the pre-treatment, and the unit volume methane production improves 37%.
Embodiment 3:
(1) be that 20% dewatered sludge carries out pre-treatment and in water-bath, is heated to 45 ℃ with solid content;
(2) according to H
2O
2The ratio of/TCOD is 2.0, and adding concentration is 30% H
2O
2In being heated to 45 ℃ dewatered sludge, it is mixed, under 45 ℃ of conditions, react 20min;
(3) be cooled to about 55 ℃ subsequently, the mud of modification is added in the anaerobic fermentation tank of useful volume 10L, make anaerobically fermenting mud and charging thorough mixing in the fermentor tank; Every day continuous feeding and discharging, the inlet amount of the mud that step (2) was handled be in the fermentor tank anaerobically fermenting sludge volume 1/20, inlet amount is 0.5L/d; The control sludge retention time is 20 days; Keeping the interior temperature of charge of reactor drum is 53 ± 2 ℃, in said process, in the continuous feeding and discharging process, controls the whipping appts operating frequency; Stirred 10 minutes, and stopped 10 minutes.
Carry out high-temperature anaerobic fermentation with the dewatered sludge that is untreated and compare, the degradation rate of mud organic substance improves 10% after the pre-treatment, and the unit volume methane production improves 20%.
Comparative Examples 3
Same with embodiment 3, just dewatered sludge is without pre-treatment.
Embodiment 3 compares with Comparative Examples 3, and the degradation rate of mud organic substance improves 10% after the pre-treatment, and the unit volume methane production improves 20%.
Embodiment 4:
(1) with solid content be 20% carry out anyly, in water-bath, be heated to 90 ℃;
(2) according to H
2O
2The ratio of/TCOD is 2.0, and adding concentration is 30% H
2O
2In being heated to 90 ℃ dewatered sludge, it is mixed, under 90 ℃ of conditions, react 10min;
(3) be cooled to about 55 ℃ subsequently, be cooled to about 55 ℃ subsequently, the mud of modification is added in the anaerobic fermentation tank of useful volume 10L; Make anaerobically fermenting mud and charging thorough mixing in the fermentor tank, every day continuous feeding and discharging, the inlet amount of the mud that step (2) was handled be in the fermentor tank anaerobically fermenting sludge volume 1/10; Inlet amount is 1.0L/d, and the control sludge retention time is 10 days, and keeping the interior temperature of charge of reactor drum is 53 ± 2 ℃; In said process in the continuous feeding and discharging process; Control whipping appts operating frequency stirred 10 minutes, stopped 10 minutes.
Directly carry out high-temperature anaerobic fermentation with the dewatered sludge that is untreated and compare, the degradation rate of mud organic substance improves 15% after the pre-treatment, and the unit volume methane production improves 40%.
Comparative Examples 4
Same with embodiment 4, just dewatered sludge is without pre-treatment.
Embodiment 4 compares with Comparative Examples 4, and the degradation rate of mud organic substance improves 15% after the pre-treatment, and the unit volume methane production improves 40%.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (8)
1. one kind is improved the method for municipal sludge dry method leavening property through sludge modification, it is characterized in that: comprise following steps:
(1) heat treated: dewatered sludge is heated;
(2) hydrogen peroxide oxidation: hydrogen peroxide is joined in the dewatered sludge after the heating, and mix, carry out oxide treatment, keep the Heating temperature of step (1);
(3) anaerobically fermenting: the temperature of the mud of handling in the regulating step (2), then it is added in the anaerobic fermentation tank, mix the back with anaerobically fermenting mud and in fermentor tank, carry out fermentative processing.
2. method according to claim 1 is characterized in that: the solid content of dewatered sludge is 15-20% in the described step (1), preferred 20%.
3. method according to claim 1 is characterized in that: the Heating temperature in the described step (1) is 45-90 ℃, preferred 60 ℃.
4. method according to claim 1 is characterized in that: the concentration of hydrogen peroxide is 10-30% in the described step (2), preferred 30%.
5. method according to claim 1 is characterized in that: the add-on of the hydrogen peroxide in the described step (2) is H
2O
2The ratio of/TCOD is 0.3-2.0, preferred 1-2.0.
6. method according to claim 1 is characterized in that: the temperature hold-time in the described step (2) is 10-30min.
7. method according to claim 1 is characterized in that: the anaerobically fermenting temperature in the described step (3) is 50-60 ℃, and the temperature fluctuation range of each fermentation is between ± 2 ℃.
8. method according to claim 1 is characterized in that: in the described step (3), every day continuous feeding and discharging, the inlet amount of the mud that step (2) was handled is the 1/10-1/20 of anaerobically fermenting sludge volume in the fermentor tank;
Or it is 55-60 ℃ with the temperature regulation of mud in the described step (3);
Or in the described step (3), the residence time of mud is 10-20 days in the fermentor tank.
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| CN2012100129009A CN102531303A (en) | 2012-01-16 | 2012-01-16 | Method for improving dry process fermenting property of municipal sludge by sludge modification |
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| CN2012100129009A CN102531303A (en) | 2012-01-16 | 2012-01-16 | Method for improving dry process fermenting property of municipal sludge by sludge modification |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843963A (en) * | 2015-05-20 | 2015-08-19 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN107032580A (en) * | 2017-05-23 | 2017-08-11 | 北京首创污泥处置技术股份有限公司 | A kind of sludge dewatering agent and its application method |
| CN107399895A (en) * | 2017-09-08 | 2017-11-28 | 天津城建大学 | The method of high solid content excess sludge pyrohydrolysis and hydrogen peroxide combined pretreatment |
| CN109205974A (en) * | 2018-11-12 | 2019-01-15 | 湖北华耀生物科技有限公司 | A method of extracting organic matter from organic sludge |
| CN109279751A (en) * | 2018-11-13 | 2019-01-29 | 天津城建大学 | A kind of preprocess method of excess sludge and application |
| CN109305745A (en) * | 2018-11-22 | 2019-02-05 | 湖南农业大学 | A kind of method of cow dung deep dehydration |
| CN109912149A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of excess sludge anaerobism drying method for treating |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698561A (en) * | 2009-10-23 | 2010-04-28 | 宁波工程学院 | Silt pretreatment method for enhancing dehydration property and digestibility of silt |
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2012
- 2012-01-16 CN CN2012100129009A patent/CN102531303A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698561A (en) * | 2009-10-23 | 2010-04-28 | 宁波工程学院 | Silt pretreatment method for enhancing dehydration property and digestibility of silt |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843963A (en) * | 2015-05-20 | 2015-08-19 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN104843963B (en) * | 2015-05-20 | 2017-01-18 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN107032580A (en) * | 2017-05-23 | 2017-08-11 | 北京首创污泥处置技术股份有限公司 | A kind of sludge dewatering agent and its application method |
| CN107399895A (en) * | 2017-09-08 | 2017-11-28 | 天津城建大学 | The method of high solid content excess sludge pyrohydrolysis and hydrogen peroxide combined pretreatment |
| CN109912149A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of excess sludge anaerobism drying method for treating |
| CN109912149B (en) * | 2017-12-13 | 2021-08-31 | 中国石油化工股份有限公司 | Anaerobic drying treatment method for excess sludge |
| CN109205974A (en) * | 2018-11-12 | 2019-01-15 | 湖北华耀生物科技有限公司 | A method of extracting organic matter from organic sludge |
| CN109279751A (en) * | 2018-11-13 | 2019-01-29 | 天津城建大学 | A kind of preprocess method of excess sludge and application |
| CN109305745A (en) * | 2018-11-22 | 2019-02-05 | 湖南农业大学 | A kind of method of cow dung deep dehydration |
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Application publication date: 20120704 |