CN106587558B - Method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing content of hydrogen sulfide by alkaline fermentation - Google Patents
Method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing content of hydrogen sulfide by alkaline fermentation Download PDFInfo
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- CN106587558B CN106587558B CN201611213314.5A CN201611213314A CN106587558B CN 106587558 B CN106587558 B CN 106587558B CN 201611213314 A CN201611213314 A CN 201611213314A CN 106587558 B CN106587558 B CN 106587558B
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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
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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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- 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
Abstract
The invention relates to a method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing the content of hydrogen sulfide by alkaline fermentation. The invention adjusts the pH in the system to ensure that the initial pH of the high-solid-content sludge is =12, and then the high-solid-content sludge is maintained under anaerobic conditions of 35-37 ℃, pH =10 and 130 r/min for carrying out alkaline fermentation for 10 d. And then adjusting the pH value of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to a preferred inoculation volume ratio of 1:10, fermenting at the temperature of 35-37 ℃, and performing anaerobic digestion to produce biogas after 19d of fermentation (preferred fermentation biogas production time). The method for promoting anaerobic digestion of high-solid sludge to produce biogas and reducing the content of hydrogen sulfide through alkaline fermentation not only can reduce and make sludge treatment harmless, but also can efficiently produce biogas and realize maximum recycling. In addition, the content of hydrogen sulfide in the biogas generated by the method is low, the corrosion of the biogas to equipment is slowed down, and the biogas is further purified and utilized.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing the content of hydrogen sulfide by alkaline fermentation.
Background
According to the information provided by the housing of the people's republic of China and the ministry of urban and rural construction, as far as 2016 (3 months), more than 3910 urban sewage treatment plants have been built in China, and the sewage treatment capacity reaches 1.67 billion cubic meters per day. As a derivative product of sewage treatment, 3000-4000 ten thousand tons of sludge (with the water content of 80%) are produced in China every year. The estimated 2020 year is that the sludge yield of China can reach 6000-9000 ten thousand tons. The problem of treatment and disposal of high-solid-content sludge (solid content is more than 10%) is a serious problem commonly faced by sewage treatment plants in China at present, the high-solid-content sludge (after dehydration) generated by urban sewage treatment plants contains a large amount of microorganisms, suspended matters, colloids, nitrogen, phosphorus and other substances, and if the high-solid-content sludge cannot be properly treated and disposed, secondary pollution is generated to the environment. The common sludge treatment mode at the present stage is land landfill and incineration, and the treatment cost of the sludge treatment mode generally accounts for 40-60% of the total cost of urban sewage treatment plants. The anaerobic sludge digestion technology can not only realize the stabilization of sludge, but also efficiently recover biomass energy (such as methane), and is a common mode for sludge treatment. Since the world energy crisis, anaerobic digestion technology has been developed and matured.
At present, a plurality of scholars at home and abroad research on anaerobic digestion of high-solid sludge mostly focuses on independently improving the yield of methane and the content of methane in biogas or independently reducing the concentration of hydrogen sulfide in biogas. The literature reports that the production of hydrogen sulfide during anaerobic digestion can be effectively reduced by micro-aeration techniques, but that the production of methane (the only energy component in biogas) is affected to some extent. However, there is no report on a method for promoting hydrolysis and acidification of sludge with high solid content by alkaline fermentation, affecting the metabolic pathways of hydrogen sulfide generation in the system (regulating and controlling enzymes and microbial metabolic pathways of hydrogen sulfide generation), and simultaneously increasing the yield of biogas and reducing the content of hydrogen sulfide in biogas.
Disclosure of Invention
The invention aims to solve the technical problems that the high solid content sludge (solid content is more than 10%) is low in methane production efficiency through anaerobic digestion and the content of hydrogen sulfide in methane is high, and provides a method for simultaneously promoting the high solid content sludge to produce the methane through anaerobic digestion and reducing the content of hydrogen sulfide in the methane through alkaline fermentation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing the content of hydrogen sulfide by alkaline fermentation, which comprises the following steps:
(1) adding the high solid content sludge into a reactor, adjusting the pH value in the reactor to enable the initial pH value of the high solid content sludge to be 12, and then performing alkaline fermentation for 2-12 d under the anaerobic condition that the temperature is 35-37 ℃, the pH value is 10 and 130 r/min; wherein: the solid content of the high solid content sludge is more than 10 percent;
(2) adjusting the pH value of the sludge with high solid content obtained in the step (1) to be neutral (pH = 7), adding anaerobic inoculation mud, controlling the volume ratio of the sludge with high solid content obtained in the step (1) to the anaerobic inoculation mud to be 0.5: 10-2: 10, controlling the fermentation temperature to be 35-37 ℃, and performing anaerobic digestion for 15-25 d to produce biogas.
In the invention, the fermentation time in the step (1) is 10 days.
In the invention, after the high solid content sludge in the step (2) is subjected to 10d alkaline fermentation, the pH value is adjusted to be neutral (pH = 7), the volume ratio of the high solid content sludge obtained in the step (1) to the anaerobic inoculation sludge is controlled to be 1:10, and the anaerobic inoculation sludge is added for anaerobic digestion to produce methane.
In the invention, the biogas yield is synchronously improved and the content of hydrogen sulfide in the biogas is reduced through the fermentation of 19d in the step (2).
The invention has the following beneficial effects:
the method for promoting anaerobic digestion of high-solid sludge to produce biogas and reducing the content of hydrogen sulfide by alkaline fermentation not only can reduce and make sludge treatment harmless, but also can improve the recycling benefit. The invention can effectively solve the problems that the hydrolysis and acidification processes of the high-solid sludge are limited due to the special structure of the high-solid sludge (the solid content is more than 10%) when the high-solid sludge is subjected to common anaerobic digestion, the biogas yield is difficult to reach the theoretical gas yield during anaerobic digestion, and the biogas contains higher hydrogen sulfide, so that the long-term maintenance of equipment and the utilization and purification of the biogas at the later stage are not facilitated.
Detailed Description
The present invention is further illustrated by the following examples.
In order to promote the anaerobic digestion of the sludge with high solid content to produce the biogas and reduce the efficiency of the hydrogen sulfide content in the biogas, the invention discovers that the method for promoting the anaerobic digestion of the sludge with high solid content to produce the biogas and reducing the hydrogen sulfide content by alkaline fermentation can obviously improve the yield of the biogas and reduce the hydrogen sulfide content in the biogas through repeated experiments.
The invention relates to a method for promoting anaerobic digestion of high-solid sludge to produce biogas and reducing the content of hydrogen sulfide by alkaline fermentation, which comprises the following steps:
the high solid content is realized by adjusting the pH value in the systemThe initial pH =12 of the sludge (the solid content is more than 10%), and then the sludge is maintained at 35-37 ℃ under the anaerobic conditions of pH =10 and 130 r/min, alkaline fermentation is carried out for 2-12 d respectively to promote hydrolysis and acidification of the sludge with high solid content, so that enough substrates are provided for the subsequent anaerobic methanogenesis stage; the process also promotes the dissolution of Extracellular Polymeric Substances (EPS) in the sludge, so that more metal ions coated in the EPS are released, and the metal ions and negative divalent sulfur ions (S) in a reaction system are increased2-) The chance of contact; in addition, metabolic pathways (related enzymes and microorganisms) of sulfur in the reaction system are inhibited. And then adjusting the pH value of the high-solid-content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5: 10-2: 10, fermenting at the temperature of 35-37 ℃ for 15-23 d, and performing anaerobic digestion to produce biogas.
Through experiments, the invention finds that the high-solid-content sludge (solid content is more than 10%) is maintained under the anaerobic condition of pH =10 by adjusting the pH value in the system, and alkaline fermentation is carried out for 10d (better fermentation time). And then adjusting the pH value of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the optimal inoculation volume ratio of 1:10, fermenting at the temperature of 35-37 ℃, and performing anaerobic digestion to produce biogas after 19d of fermentation (optimal fermentation for producing biogas), wherein the obtained biogas has high content and low content of hydrogen sulfide in the biogas.
Example 1
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the high solid content sludge is in a cylindrical shape), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 2 d. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 120 mL/g-VS, and the hydrogen sulfide content in the biogas is 115 ppm.
Example 2
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the high solid content sludge is in a cylindrical shape), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, and alkaline fermentation is carried out for 4 d. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 133 mL/g-VS, and the hydrogen sulfide content in the methane is 90 ppm.
Example 3
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the high solid content sludge is in a cylindrical shape), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, and alkaline fermentation is carried out for 6 d. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 155mL/g-VS, and the hydrogen sulfide content in the biogas is 75 ppm.
Example 4
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the high solid content sludge is in a cylindrical shape), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, and alkaline fermentation is carried out for 8 d. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 166.8mL/g-VS, and the hydrogen sulfide content in the biogas is 56 ppm.
Example 5
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and alkaline fermentation is carried out for 10d (determined as the optimal fermentation time) by adjusting the pH value in the system and keeping the high solid content sludge under the anaerobic condition of pH = 10. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 178.5mL/g-VS, and the hydrogen sulfide content in the biogas is 42 ppm.
Example 6
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the high solid content sludge is in a cylindrical shape), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, and alkaline fermentation is carried out for 12 d. And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 15d, wherein the methane yield is 150.2mL/g-VS, and the hydrogen sulfide content in the biogas is 46 ppm.
Example 7
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 17d, wherein the methane yield is 189.5mL/g-VS, and the hydrogen sulfide content in the biogas is 28 ppm.
Example 8
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH value of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃, fermenting for 19d (determining the time for producing biogas through optimal fermentation), wherein the yield of methane is 232.2mL/g-VS, and the content of hydrogen sulfide in the biogas is 15 ppm.
Example 9
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 21d, wherein the methane yield is 223.6mL/g-VS, and the hydrogen sulfide content in the methane is 30 ppm.
Example 10
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃, and fermenting for 23d, wherein the methane yield is 212.8mL/g-VS, and the hydrogen sulfide content in the biogas is 35 ppm.
Example 11
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 0.5:10, fermenting at the temperature of 35-37 ℃ for 25d, wherein the methane yield is 195.6mL/g-VS, and the hydrogen sulfide content in the biogas is 36 ppm.
Example 12 (optimum conditions)
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH value of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge (determined as a better inoculation ratio) according to the volume ratio of 1:10, wherein the fermentation temperature is 35-37 ℃, the methane yield is 252.2mL/g-VS after 19d of fermentation (the time for producing biogas by better fermentation), and the hydrogen sulfide content in the biogas is 10 ppm.
Example 13
1kg of high solid content sludge (solid content is more than 10%) of a sewage plant is added into a 2L reactor (made of glass fiber reinforced plastic, the working volume is 1.5L, the inner diameter is 10cm, the height is 26cm, and the sludge is cylindrical), and the pH value in the system is adjusted to keep the high solid content sludge under the anaerobic condition of pH =10, so that alkaline fermentation is carried out for 10d (the preferable fermentation time). And then adjusting the pH value of the high solid content sludge to be neutral (pH = 7), adding anaerobic inoculation sludge according to the volume ratio of 2:10, fermenting at the temperature of 35-37 ℃, fermenting for 19d (preferably fermenting to produce biogas), wherein the yield of methane is 242.2mL/g-VS, and the content of hydrogen sulfide in biogas is 23 ppm.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (4)
1. A method for promoting anaerobic digestion of high-solid sludge to produce biogas and reduce the content of hydrogen sulfide by alkaline fermentation is characterized by comprising the following specific steps:
(1) adding the high solid content sludge into a reactor, adjusting the pH value in the reactor to enable the initial pH value of the high solid content sludge to be 12, and then performing alkaline fermentation for 2-12 d under the anaerobic condition that the temperature is 35-37 ℃, the pH value is 10 and 130 r/min; wherein: the solid content of the high solid content sludge is more than 10 percent;
(2) adjusting the pH value of the sludge with high solid content obtained in the step (1) to be neutral, namely pH =7, adding anaerobic inoculation mud, controlling the volume ratio of the sludge with high solid content obtained in the step (1) to the anaerobic inoculation mud to be 0.5: 10-2: 10, controlling the fermentation temperature to be 35-37 ℃, and performing anaerobic digestion for 15-25 d to produce biogas.
2. The method for promoting anaerobic digestion of high solids sludge to produce biogas and reduce hydrogen sulfide content by alkaline fermentation as claimed in claim 1, wherein: the fermentation time in the step (1) is 10 days.
3. The method for promoting anaerobic digestion of high solids sludge to produce biogas and reduce hydrogen sulfide content by alkaline fermentation as claimed in claim 2, wherein: and (3) after the high solid content sludge in the step (2) is subjected to alkaline fermentation for 10d, adjusting the pH value to be neutral, namely pH =7, controlling the volume ratio of the high solid content sludge obtained in the step (1) to the anaerobic inoculation sludge to be 1:10, and adding the anaerobic inoculation sludge for anaerobic digestion to produce methane.
4. The method for promoting anaerobic digestion of high solids sludge to produce biogas and reduce hydrogen sulfide content by alkaline fermentation as claimed in claim 1, wherein: and (3) fermenting for 19d in the step (2), so that the yield of the biogas is synchronously improved, and the content of hydrogen sulfide in the biogas is reduced.
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| CN103172241A (en) * | 2013-02-28 | 2013-06-26 | 同济大学 | Method for improving methane yield of primary sludge through utilizing expanded granular sludge bed |
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| CN1986819A (en) * | 2006-12-18 | 2007-06-27 | 同济大学 | Time-controllable greenhouse marsh gas fermentation process and system |
| CN101157938A (en) * | 2007-09-11 | 2008-04-09 | 江南大学 | Method for relieving restriction of sulfate reduction to anaerobic digestion methane production process |
| CN102482686A (en) * | 2009-08-03 | 2012-05-30 | Dge京特博士工程有限公司 | Method For Producing Biogas Or Sewage Gas |
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