CN116332452A - Method for in-situ inhibition of hydrogen sulfide production - Google Patents
Method for in-situ inhibition of hydrogen sulfide production Download PDFInfo
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 23
- 230000019086 sulfide ion homeostasis Effects 0.000 title claims abstract description 15
- 230000005764 inhibitory process Effects 0.000 title description 9
- 239000010802 sludge Substances 0.000 claims abstract description 125
- 238000011282 treatment Methods 0.000 claims abstract description 87
- 238000000855 fermentation Methods 0.000 claims abstract description 52
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- 239000010865 sewage Substances 0.000 claims abstract description 24
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 14
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- 239000011574 phosphorus Substances 0.000 claims abstract description 10
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- 230000001276 controlling effect Effects 0.000 claims abstract 4
- 230000001105 regulatory effect Effects 0.000 claims abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 4
- 235000011010 calcium phosphates Nutrition 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 5
- 239000006227 byproduct Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 231100000331 toxic Toxicity 0.000 abstract description 3
- 230000002588 toxic effect Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 150000004666 short chain fatty acids Chemical class 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
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- 229920005372 Plexiglas® Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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- 229930195729 fatty acid Natural products 0.000 description 1
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- 230000001737 promoting effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
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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
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a method for inhibiting hydrogen sulfide generation in situ by using fermentation liquor. The specific method comprises the following steps: concentrating sludge of the municipal sewage plant to improve the solid content of the sludge; anaerobic fermentation liquid in the sludge anaerobic treatment tank is taken for treatment, the components such as SCFAs, soluble phosphorus and the like in the anaerobic fermentation liquid are removed, and then the anaerobic fermentation liquid is stored for standby; mixing the obtained concentrated sludge with the treated fermentation liquor in a certain proportion, pre-treating a sludge matrix by regulating and controlling pH and temperature, and finally, performing anaerobic treatment on the sludge, and maintaining continuous flow stable operation of the reactor by controlling the residence time of the sludge. The results show that the generation of hydrogen sulfide in the anaerobic sludge treatment process can be greatly inhibited based on the treatment. The method has the advantages that the waste is treated by waste through the byproducts of the sewage plant by simple, cheap and effective operation, the generation of toxic and harmful gas of hydrogen sulfide in anaerobic sludge treatment is reduced, and the method has important significance for the treatment and disposal of sludge.
Description
Technical Field
The invention belongs to the technical fields of environmental protection and sludge treatment recycling, and particularly relates to a method for generating hydrogen sulfide by in-situ reduction of sludge anaerobic treatment of a sewage treatment plant.
Technical Field
In order to treat increasingly domestic wastewater, the number of urban sewage treatment plants in China is rapidly increased, wherein most sewage treatment plants treat sewage by adopting an activated sludge process. Therefore, while achieving the standard discharge of sewage, a large amount of primary sludge and surplus sludge are inevitably generated. The rapid increase in the amount of sludge causes serious environmental problems, and the disposal thereof is a problem to be solved.
The sludge contains a large amount of available organic matters such as proteins, sugar and the like. Anaerobic treatment is a currently commonly used sludge treatment mode. Anaerobic treatment can realize sludge reduction and reduce the cost of final treatment of sludge; can inactivate pathogens and other microorganisms in the sludge, realize the harmless treatment of the sludge, and can recover a large amount of short-chain fatty acid, hydrogen, methane and other products with high added value from the sludge, thereby achieving the effect of waste-to-waste treasured production and having great effect of relieving the current energy crisis.
In the anaerobic sludge treatment process, microorganisms degrade organisms to produce volatile fatty acids, hydrogen, methane and other products with high added value, and simultaneously produce hydrogen sulfide. Hydrogen sulfide is a highly toxic and inflammable gas with colorless and odorous egg smell, has strong corrosiveness, can corrode pipelines and other equipment, and can generate sulfur dioxide after combustion to pollute the atmosphere. The national environmental protection standard prescribes: when the marsh gas energy is utilized, the content of hydrogen sulfide in the marsh gas is not more than 20mg/m 3 . H in marsh gas 2 The mass concentration of S is generally 1-12g/m 3 Is far higher than the specification of the environmental protection standard in China. The hydrogen sulfide in the biogas directly affects the quality of the biogas, thereby limiting the direct utilization of the biogas, reducing the economic benefit of producing the biogas by anaerobic sludge treatment and preventing the further popularization of anaerobic sludge treatment. Therefore, a method for inhibiting the generation of hydrogen sulfide by anaerobic sludge treatment, which is simple and convenient to operate, safe, cheap and efficient, is needed.
In the existing technology for inhibiting the generation of hydrogen sulfide in anaerobic sludge treatment, the current technology mainly focuses on the addition of various chemical agents such as potassium permanganate or the adoption of various pretreatment methods such as alkaline pretreatment and heat pretreatment to inhibit the activity of sulfate reducing bacteria, so that the generation of hydrogen sulfide is reduced. For example, it is reported (documents Chemical Engineering Journal,2022,430,133150) that adding a certain content of potassium permanganate to the excess sludge was found to significantly reduce the production of hydrogen sulfide gas in anaerobic sludge treatment; the patent No. CN201611213314.5 discloses a method for promoting anaerobic digestion of high-solid-content sludge to produce methane and reducing the content of hydrogen sulfide by alkaline fermentation, wherein the pH in a system is adjusted to ensure that the initial pH of the high-solid-content sludge is=12, and then the high-solid-content sludge is subjected to alkaline fermentation for 10d under the anaerobic condition of 35-37 ℃ and pH=10 and 130 r/min, so that the yield of hydrogen sulfide is effectively reduced. However, the above-mentioned methods have unavoidable drawbacks, and the use of various chemical agents or pretreatment methods inevitably increases the running cost of sewage treatment plants, and increases the indirect carbon emission in the sewage treatment process. Along with the aggravation of global resource energy crisis and the proposal of the 'double carbon' target of China under the background of global climate change, the development of an economic and efficient method for in-situ inhibition of the generation of hydrogen sulfide in sludge treatment is particularly important, and is also the research focus in the current sludge treatment field.
Sludge fermentation liquor widely exists in sewage plants, has complex components, contains high concentration of ammonia nitrogen, a large amount of anaerobic microorganisms and various released organic or inorganic substances such as protein, polysaccharide, humus, lignocellulose, metal ions and the like. The existence of high-concentration ammonia nitrogen and heavy metal ions can possibly inhibit microorganisms generated by hydrogen sulfide (document Bioresource technology.2017, 245,598-605;Bioresource Technol.2019,276,91-96), but at the same time, the enriched number of huge and various anaerobic microorganisms (particularly hydrolytic microorganisms) in the fermentation liquor can improve the functional microorganisms in a fermentation system, and residual biochemical organic matters (such as proteins and the like) in the fermentation liquor are continuously degraded along with the advancement of the anaerobic fermentation process, so that additional substrates are provided for the subsequent production of hydrogen sulfide. Anaerobic microorganisms and biochemical organisms contained in the fermentation broth may promote the production of hydrogen sulfide during anaerobic sludge treatment. The complexity of the actual broth composition fills the uncertainty with techniques based on the in situ inhibition of sludge anaerobic hydrogen sulfide production by the broth. So far, no research team has developed about 'fermentation liquor in situ inhibition of sludge anaerobic treatment hydrogen sulfide production' at home and abroad.
In view of the problems, the invention provides a method for inhibiting the generation of hydrogen sulfide by treating sludge in situ by utilizing anaerobic fermentation liquid generated in the sewage sludge treatment process of a sewage plant, thereby achieving good inhibition effect, reducing the generation of hydrogen sulfide in situ by utilizing sewage treatment byproducts, reducing the use of chemical agents and energy sources on one hand, greatly reducing the treatment cost, and providing a new thought for the treatment of sludge fermentation liquid by treating waste on the other hand, and having strong practicability.
Disclosure of Invention
The invention aims to provide a method for in-situ inhibition of hydrogen sulfide production in a sludge treatment process, namely, in-situ inhibition of sludge anaerobic treatment to produce hydrogen sulfide by utilizing byproduct fermentation liquor reflux produced by a sewage plant.
In order to achieve the above purpose, the scheme of the invention is as follows:
a method of inhibiting hydrogen sulfide production in situ comprising the steps of:
(1) And (3) concentrating the primary sludge and the residual sludge of the municipal sewage treatment plant, and improving the solid content of the sludge.
(2) The fermentation broth is from a sludge anaerobic treatment tank, contains a large amount of components such as Short Chain Fatty Acids (SCFAs) and soluble phosphates, and requires recovery of the components such as SCFAs and phosphorus before the sludge is treated with the fermentation broth. The specific method comprises the following steps: adjusting the pH value of the fermentation liquor to 7.8-11 by adopting sodium hydroxide solution, then adding calcium chloride solution according to the molar ratio of calcium to phosphorus of 1.5-2.1 for reaction for 10-30 minutes, and filtering precipitate containing calcium phosphate crystals. Then, components such as SCFAs in the fermentation liquor are recovered by adsorbing and storing the microbial intracellular polymer PHA, the reaction is carried out under an aerobic condition, the aerobic reaction time is 0.5-2h, the sludge residence time is 3 days, and the temperature is 20+/-1 ℃.
(3) The fermentation liquor after being treated by SCFAs, phosphorus recovery and the like is stored in a storage tank for use.
(4) Taking out the treated fermentation liquor from the storage tank, adding the fermentation liquor into a substrate to be treated (namely the concentrated sludge in the step (1)) according to a certain proportion, controlling the pH value and the temperature of a fermentation system, and pretreating the substrate for a period of time.
(5) After pretreatment, nitrogen is filled into the sludge matrix, the anaerobic closed environment of the reactor is maintained, the pH of the reaction is not controlled, and anaerobic treatment is carried out on the sludge.
(6) In the anaerobic sludge treatment process, a certain amount of anaerobic sludge treatment mixture is taken out of the reactor every day, a new sludge matrix after pretreatment is added, the stable operation of the reactor is maintained, the concentration of hydrogen sulfide in the reactor is periodically detected, and the yield of the hydrogen sulfide is stable after the reactor continuously operates for a period of time.
The total suspended solids of the sludge in the step (1) are maintained in the range of 20-30g/L as a matrix.
The pH value of the pretreatment of the system in the step (4) is controlled to be 8.5, the temperature is controlled to be room temperature (20 ℃), the pretreatment time is 10 hours, and the consumption of energy and medicament in the treatment process is effectively reduced.
The certain proportion in the step (4) is that the volume ratio of the fermentation liquor to the matrix is controlled to be 10-30%.
The residence time of the sludge in the above step (6) was set to 10 days, i.e., the volume of the anaerobic sludge treatment mixture taken out every day and the added fresh sludge matrix was 10 total volume of the sludge in the reactor.
The anaerobic sludge treatment conditions in the step (6) are as follows: the temperature is 20+/-1 ℃ and the vibration speed is 100rpm/min.
The concentration of the hydrogen sulfide gas was measured by a gas chromatograph at regular intervals of 24 hours as described in the above step (6).
The period of operation described in step (6) above was 6 months.
The innovation point and advantage of this study are:
the invention utilizes fermentation liquor widely existing in sewage treatment plants to inhibit the anaerobic treatment of sludge to generate hydrogen sulfide in situ, can obviously inhibit sulfate reducing bacteria in the anaerobic treatment of sludge, and reduces the activity of hydrogen sulfide generating microbial enzymes such as hydrolase, amino acid lyase and the like, thereby realizing the inhibition of hydrogen sulfide. Compared with the prior art, the invention utilizes the treatment byproducts of the sewage plant to regulate and control the sludge treatment in situ, does not need to add a large amount of other chemical agents or energy sources, greatly reduces the running cost of the sewage plant, and has important significance for realizing large-scale application of anaerobic sludge treatment. The invention suppresses the generation of toxic and harmful substances, namely hydrogen sulfide, in the anaerobic sludge treatment, reduces the harm to the environment and even the human body, can promote the safe and effective popularization of the anaerobic sludge treatment technology, and has important significance for the reduction and recycling of sludge.
Drawings
FIG. 1 is a process flow diagram of the present invention
Detailed Description
The invention is further described below in connection with specific practical examples, but the scope of the invention is not limited thereto.
Example 1
(1) Preparation of a substrate: sludge produced in municipal sewage plants was concentrated (i.e., naturally precipitated at room temperature and then supernatant was removed) in a plexiglass vessel having a working volume of 100L so that the total suspended solids of the sludge was 28.9g/L.
(2) Preparation and treatment of fermentation liquor: firstly, adding 50L of fermentation liquor taken from a sludge anaerobic treatment tank of an urban sewage treatment plant into a 100L organic glass container; then, the original components such as SCFAs, soluble phosphorus and the like in the fermentation liquor are recycled, so that the influence on the subsequent experiment is avoided, and the specific method is as follows: adjusting the pH value of the fermentation liquor to 7.8-11 by adopting a sodium hydroxide solution, then adding a calcium chloride solution according to the molar ratio of calcium to phosphorus of 1.5-2.1 for reaction for 10-30 minutes, and filtering a precipitate containing calcium phosphate crystals; then, components such as SCFAs in the fermentation liquor are recovered by adsorbing and storing the microbial intracellular polymer PHA, the reaction is carried out under an aerobic condition, the aerobic reaction time is 0.5-2h, the sludge residence time is 3 days, and the temperature is 20+/-1 ℃. The fermentation broth obtained after the treatment was stored in a storage tank having a volume of 100L.
(3) Pretreatment: the sludge obtained in (1) was fed into the reactor, and the fermentation broth obtained in (2) (volume ratio of fermentation broth to sludge: 30%) was added in an amount of 1.5L, the treatment temperature was controlled to 20 ℃, and the pH was controlled to 8.5 and maintained for 10 hours.
(4) Anaerobic treatment of sludge: after pretreatment, nitrogen is filled into the reactor for 5min to remove oxygen, the sealed reactor is put into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20+/-1 ℃, the shaking speed is 100rpm/min, the residence time of sludge is 10 days, namely 0.65L of sludge anaerobic treatment mixture is required to be taken out of the running reactor every day, 0.65L of pretreated new sludge substrate in (3) is added, and after the reactor is continuously operated for 180 days, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 13ppm.
Example 2
(1) Preparation of a substrate: sludge produced in municipal sewage plants was concentrated (i.e., naturally precipitated at room temperature and then supernatant was removed) in a plexiglass vessel having a working volume of 100L so that the total suspended solids of the sludge was 28.9g/L.
(2) Preparation and treatment of fermentation liquor: firstly, adding 50L of fermentation liquor taken from a sludge anaerobic treatment tank of an urban sewage treatment plant into a 100L organic glass container; then, the original components such as SCFAs, soluble phosphorus and the like in the fermentation liquor are recycled, so that the influence on the subsequent experiment is avoided, and the specific method is as follows: adjusting the pH value of the fermentation liquor to 7.8-11 by adopting a sodium hydroxide solution, then adding a calcium chloride solution according to the molar ratio of calcium to phosphorus of 1.5-2.1 for reaction for 10-30 minutes, and filtering a precipitate containing calcium phosphate crystals; then, components such as SCFAs in the fermentation liquor are recovered by adsorbing and storing the microbial intracellular polymer PHA, the reaction is carried out under an aerobic condition, the aerobic reaction time is 0.5-2h, the sludge residence time is 3 days, and the temperature is 20+/-1 ℃. The fermentation broth obtained after the treatment was stored in a storage tank having a volume of 100L.
(3) Pretreatment: the sludge obtained in (1) was added to the reactor, and 0.5L of the fermentation broth obtained in (2) (volume ratio of fermentation broth to sludge: 10%) and 1L of distilled water (ensuring that the total volume was still 6.5L) were added, the treatment temperature was controlled to 20 ℃, and the pH was controlled to 8.5 and maintained for 10 hours.
(4) Anaerobic treatment of sludge: after pretreatment, nitrogen is filled into the reactor for 5min to remove oxygen, the sealed reactor is put into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20+/-1 ℃, the shaking speed is 100rpm/min, the residence time of sludge is 10 days, namely 0.65L of sludge anaerobic treatment mixture is required to be taken out of the running reactor every day, 0.65L of pretreated new sludge substrate in (3) is added, and after the reactor is continuously operated for 180 days, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 59ppm.
Comparative example 1
(1) Preparation of a substrate: sludge produced in municipal sewage plants was concentrated (i.e., naturally precipitated at room temperature and then supernatant was removed) in a plexiglass vessel having a working volume of 100L so that the total suspended solids of the sludge was 28.9g/L.
(2) Pretreatment: 5L of the sludge obtained in (1) was charged into the reactor, and 1.5L of distilled water (ensuring that the total volume was still 6.5L) was added, the treatment temperature was controlled to 20 ℃, and the pH was controlled to 8.5 and maintained for 10 hours.
(3) Anaerobic treatment of sludge: after pretreatment, nitrogen is filled into the reactor for 5min to remove oxygen, the sealed reactor is put into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20+/-1 ℃, the shaking speed is 100rpm/min, the residence time of sludge is 10 days, namely 0.65L of sludge anaerobic treatment mixture is required to be taken out of the running reactor every day, 0.65L of pretreated new sludge substrate in (2) is added, and after the reactor is continuously operated for 180 days, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 135ppm.
Comparative example 2
(1) Preparation of a substrate: sludge produced in municipal sewage plants was concentrated (i.e., naturally precipitated at room temperature and then supernatant was removed) in a plexiglass vessel having a working volume of 100L so that the total suspended solids of the sludge was 28.9g/L.
(2) Anaerobic treatment of blank sludge: without any pretreatment, 5L of sludge obtained in (1) is directly added into a reactor, 1.5L of distilled water (the total volume is still 6.5L) is added, then nitrogen is filled in, oxygen is removed for 5min, the reactor is sealed and put into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20+/-1 ℃, the shaking speed is 100rpm/min, the residence time of the sludge is 10 days, namely 0.65L of sludge anaerobic treatment mixture is required to be taken out from the running reactor every day, 0.65L of sludge obtained in (1) is added, the concentration of hydrogen sulfide in the reactor is stable after the reactor is continuously operated for 180 days, and the concentration of the hydrogen sulfide is 197ppm.
The hydrogen sulfide concentrations of the examples and comparative examples are shown in table 1:
table 1 comparative table of the treatments of examples and comparative examples
As can be seen from the table, the hydrogen sulfide yields of example 1 and example 2 were greatly reduced from those of comparative example 1 and comparative example 2, and in particular, the hydrogen sulfide yield of example 1 under the optimum conditions was reduced to the maximum of 6.6% of that of comparative example 2.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Many modifications may be made to the present teachings by one of ordinary skill in the art, or equivalents may be substituted for elements thereof without departing from the spirit and scope of the present teachings. Therefore, any simple improvements and modifications that do not depart from the scope of the present invention should be made within the scope of the present invention.
Claims (9)
1. A method for inhibiting the generation of hydrogen sulfide in situ, which is characterized by mainly comprising the following steps:
primary sludge and residual sludge of the urban sewage treatment plant are taken for concentration treatment, so that the solid content of the sludge is improved; anaerobic fermentation liquid in the sludge anaerobic treatment tank is treated, components such as SCFAs, soluble phosphorus and the like are recovered, and the treated fermentation liquid is stored for later use; mixing the obtained concentrated sludge with the treated fermentation liquor in a certain proportion, pre-treating the sludge matrix by regulating and controlling pH and temperature, finally anaerobic treating the sludge, taking out a certain content of sludge anaerobic treatment mixture from the reactor every day by controlling the sludge residence time, adding a new sludge matrix after pretreatment, maintaining the stable operation of the reactor, periodically detecting the concentration of hydrogen sulfide in the reactor, and stabilizing the yield of the hydrogen sulfide after the reactor continuously operates for a period of time.
2. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: the total suspended solids of the concentrated sludge is kept in the range of 20-30 g/L.
3. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: the fermentation broth is treated, the pH value of the fermentation broth is required to be adjusted to 7.8-11, then calcium chloride solution is added according to the molar ratio of calcium to phosphorus of 1.5-2.1 for reaction for 10-30 minutes, and finally, precipitate containing calcium phosphate crystals is filtered.
4. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: the fermentation liquor is treated under aerobic condition, the aerobic reaction time is 0.5-2h, the sludge retention time is 3 days, and the temperature is 20+/-1 ℃.
5. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: when the treated fermentation liquor is utilized to pretreat the sludge, the volume ratio of the added fermentation liquor to the sludge matrix is 10-30%.
6. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: when the treated fermentation liquor is used for pretreatment of sludge, the pH of the pretreatment is controlled to be 8.5, the temperature is controlled to be room temperature (20 ℃), and the pretreatment time is 10 hours.
7. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: after pretreatment, nitrogen is filled into the sludge matrix for 5min, the anaerobic closed environment of the reactor is maintained, the pH of the reaction is not controlled, and anaerobic treatment is carried out on the sludge.
8. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: in the anaerobic sludge treatment process, the residence time of the sludge is set to 10 days, namely, the volume of the anaerobic sludge treatment mixture taken out every day and the volume of the added new sludge matrix are 10 times the total volume of the sludge in the reactor.
9. A method of inhibiting hydrogen sulfide production in situ according to claim 1, wherein: in the anaerobic sludge treatment process, after the reactor continuously runs for 6 months, the system reaches a steady state, and the yield of hydrogen sulfide is also stable.
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