CN110902957A - Method for realizing synchronous desulfurization and denitrification of leather wastewater by using sulfur autotrophic denitrification process - Google Patents

Method for realizing synchronous desulfurization and denitrification of leather wastewater by using sulfur autotrophic denitrification process Download PDF

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CN110902957A
CN110902957A CN201911241924.XA CN201911241924A CN110902957A CN 110902957 A CN110902957 A CN 110902957A CN 201911241924 A CN201911241924 A CN 201911241924A CN 110902957 A CN110902957 A CN 110902957A
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denitrification
wastewater
desulfurization
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张英
燕锡尧
张映
刘文玉
贾冲
秦军
房立彬
李川川
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Shandong Haijingtian Environmental Protection Technology Co Ltd
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Abstract

The invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process, which comprises the following steps: treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank to obtain treated wastewater; adding polymeric ferric sulfate and polyacrylamide into the regulating tank; adding a desulfurization microbial inoculum into the primary aerobic tank; degreasing bacteria are added into the secondary aerobic tank; the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L. The invention adds medicament into the adjusting tank; a large amount of sulfur ions are generated by hydrolysis and acidification, and then sulfur autotrophic denitrification is carried out in a first-level A pool; heterotrophic denitrification is carried out in the second-stage A pool, then two-stage aerobic treatment is adopted to realize complete nitrification, and synchronous desulfurization and denitrification of the leather wastewater are realized by adding a desulfurization microbial inoculum and a degreasing microbial inoculum; but also improves the stability of the system, the load of biochemical treatment and the impact resistance.

Description

Method for realizing synchronous desulfurization and denitrification of leather wastewater by using sulfur autotrophic denitrification process
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process.
Background
The blue wet leather wastewater is relatively common wastewater in the leather industry, the average COD (chemical oxygen demand) is 10000-20000 mg/L, the average ammonia nitrogen is 800-1000 mg/L, the average total nitrogen is 1200-1400 mg/L, the average sulfide content is 80-240 mg/L, the water temperature is 25-40 ℃, and the blue wet leather wastewater is typical high-grease, high-sulfide, high-total nitrogen and high-water-temperature wastewater. These characteristics, especially the excessive sulfide and water temperature, have a great impact on the subsequent biochemical system, which results in the treated wastewater still containing higher COD and total nitrogen and can not achieve the discharge reaching the standard.
The sulfur autotrophic denitrification process utilizes sulfur autotrophic denitrification bacteria, such as thiobacillus denitrificans and the like, and can oxidize sulfur ions into elemental sulfur and reduce nitrate into nitrogen at the same time under the condition of oxygen deficiency, and in the process, the bacteria obtain energy required by the growth of self organisms. This property of sulfur autotrophic denitrifying bacteria has received increasing attention from researchers because it provides the possibility of achieving simultaneous desulfurization and denitrification.
At present, several patents and studies have implemented the treatment of wastewater using a sulfur autotrophic denitrification process. For example, in chinese patent publication No. CN201810368904.8, a method for treating nitrogen and phosphorus in sewage by using sulfur autotrophic denitrifying bacteria to respectively construct a pyrite treatment module and a sulfur treatment module, and combining them in various ways is described; in publication No. CN201910541069.8, a method for removing nitrogen and phosphorus by using A/O-SBR and sulfur autotrophic denitrification in combination is described. Both methods aim at nitrogen and phosphorus removal of wastewater, and the process is not applied to treatment of leather wastewater with high grease, high sulfide, high total nitrogen and high water temperature at present.
Disclosure of Invention
In view of the above, the present invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by using a sulfur autotrophic denitrification process, which can realize synchronous desulfurization and denitrification.
The invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process, which comprises the following steps of:
treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank in sequence to obtain treated wastewater;
polymeric ferric sulfate and polyacrylamide are added into the regulating tank; a desulfurization microbial inoculum is added into the primary aerobic tank; a degreasing microbial inoculum is added into the secondary aerobic tank;
the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L.
Preferably, the adding amount of the polymeric ferric sulfate in the regulating tank is 200-500 mg/L, and the adding amount of the polyacrylamide is 10-30 mg/L.
Preferably, the desulfurization microbial inoculum comprises Candida tropicalis, Pichia pastoris, Bacillus pumilus and filamentous sulfur bacteria in a volume ratio of 20-40: 20-30: 10-20: 40-50;
the degreasing homogenizing agent comprises yeast, bacillus atrophaeus, pseudomonas, bacillus cereus and streptomyces in a volume ratio of 5-15: 20-40: 30-60: 40-50: 5-10.
Preferably, the concentration of dissolved oxygen in the primary aerobic tank is 1-4 mg/L, and the sludge sedimentation ratio is controlled to be 30-35%.
Preferably, the concentration of the dissolved oxygen in the secondary aerobic tank is 1.5-2.5 mg/L, and the pH value is 7.0-7.5.
Preferably, the nitrifying liquid in the secondary aerobic tank flows back and flows back to the primary anaerobic tank and the secondary anaerobic tank respectively, the reflux ratio is 150-300%, and the proportion of the reflux ratio is 1: 1.
Preferably, a primary sedimentation tank is arranged between the adjusting tank and the hydrolysis acidification tank, and part of effluent in the primary sedimentation tank is led to the secondary anaerobic tank.
Preferably, the water outlet of the hydrolysis acidification tank is 0.1-0.4 mg/L of dissolved oxygen; the pH value is 6-7.
The invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process, which comprises the following steps of: treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank to obtain treated wastewater; the regulating tank comprises polymeric ferric sulfate and polyacrylamide; a desulfurization microbial inoculum is added into the primary aerobic tank; a degreasing microbial inoculum is added into the secondary aerobic tank; the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L. In the invention, a medicament is added into a regulating tank for pretreatment; a large amount of sulfur ions are generated by hydrolysis acidification, and then sulfur autotrophic denitrification is carried out by utilizing the sulfur ions and nitrate radicals in a first-level A pool; heterotrophic denitrification is carried out in the second-stage A pool, then two-stage aerobic treatment is adopted to realize complete nitrification, and synchronous desulfurization and denitrification of the leather wastewater are realized by adding a desulfurization microbial inoculum and a degreasing microbial inoculum; the stability of a biochemical system is also improved; the load and impact resistance of biochemical treatment are improved. The method provided by the invention has the remarkable advantages of low investment and low cost, and is easy to popularize in the industry. The experimental results show that: the device stably operates for 2 months, the COD of the effluent is reduced to be below 300mg/L, the ammonia nitrogen is reduced to be below 20mg/L, the total nitrogen is reduced to be below 70mg/L, and the sulfide is reduced to be below 5 mg/L; the water inlet of the system is lifted to 2000m3D; the water inlet index COD is 15000-20000 mg/L, the ammonia nitrogen concentration is 800-900 mg/L, the total nitrogen concentration is 900-1000 mg/L, and when sulfide fluctuates between 100 and 150mg/L, the effluent of the system can reach the discharge standard.
Drawings
FIG. 1 is a process flow diagram of wastewater treatment provided by the present invention;
fig. 2 is a water outlet index variation graph of embodiment 1 of the present invention.
Detailed Description
The invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process, which comprises the following steps of:
treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank to obtain treated wastewater;
the regulating tank comprises polymeric ferric sulfate and polyacrylamide; a desulfurization microbial inoculum is added into the primary aerobic tank; a degreasing microbial inoculum is added into the secondary aerobic tank;
the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L.
In the invention, the leather wastewater enters a regulating tank; in the leather wastewater generation process, salt-soaked leather is used as a raw material, and blue wet leather wastewater which is an intermediate product in leather making is used as leather wastewater; the leather wastewater has the characteristics of high grease, high sulfide and high water temperature. The leather wastewater contains 10000-20000 mg/L of COD, 800-1000 mg/L of ammonia nitrogen, 1000-1400 mg/L of total nitrogen and 80-240 mg/L of sulfide. The water temperature of the leather wastewater is 25-40 ℃. The regulating tank comprises Polymeric Ferric Sulfate (PFS) and Polyacrylamide (PAM); the concentration of the polymeric ferric sulfate is 200-500 mg/L, and the concentration of the polyacrylamide is 10-30 mg/L. After the polyferric sulfate and the polyacrylamide are added into the regulating tank, the water quality is homogenized, and part of sulfide is removed, so that the toxic effect of the sulfide on a subsequent biochemical system is reduced.
And a primary sedimentation tank is preferably connected behind the regulating tank, and part of the effluent of the primary sedimentation tank is introduced into a secondary anaerobic tank to provide a carbon source for the heterotrophic denitrification in the secondary anaerobic tank so as to further remove the total nitrogen.
The rear part of the primary sedimentation tank is preferably connected with a hydrolysis acidification tank, anaerobic microorganisms in the hydrolysis acidification tank can convert insoluble organic matters in the wastewater into soluble organic matters and also can convert macromolecular organic matters in the wastewater into micromolecular organic matters, so that the biodegradability of the wastewater is improved; more importantly, sulfate radicals are reduced into sulfur ions for autotrophic denitrification of a subsequent anoxic pond. The dissolved oxygen at the water outlet of the hydrolysis acidification tank is controlled to be 0.1-0.4 mg/L; the pH value is controlled to be 6-7.
The effluent of the hydrolysis acidification tank carries a large amount of sulfur ions, and enters a first-stage anaerobic (A) tank, activated sludge in the first-stage A tank contains a large amount of sulfur autotrophic denitrifying bacteria, and can utilize the sulfur ions and nitrate radicals in nitrifying liquid to carry out denitrification, so that sulfides and total nitrogen are removed, the toxicity of a subsequent biochemical system is reduced, and the total nitrogen is removed at the same time. The pH value in the primary anaerobic tank is controlled to be 7-8, and the temperature is 25-40 ℃. The concentration of dissolved oxygen at the water outlet of the primary anaerobic tank is controlled to be 0.1-0.8 mg/L. And (4) periodically discharging excess sludge in the primary anaerobic tank.
The rear part of the primary anaerobic tank is preferably connected with a primary aerobic tank, and activated sludge in the primary aerobic tank contains a large amount of ammonia nitrogen degrading bacteria and can remove most ammonia nitrogen and COD. According to the invention, a high-temperature resistant desulfurization microbial inoculum is preferably added into the primary aerobic tank, so that the shock resistance of the system is improved; the desulfurization microbial inoculum comprises Candida tropicalis, Pichia pastoris, Bacillus pumilus and filamentous sulfur bacteria in a volume ratio of 20-40: 20-30: 10-20: 40-50. The mass content of the desulfurization microbial inoculum in the leather wastewater is preferably 2-4 g/L, and more preferably 2.5-3.5 g/L; in a specific embodiment, the mass content of the desulfurization microbial inoculum in the leather wastewater is 3 g/L. The concentration of the activated sludge in the primary aerobic tank is controlled to be 6000-8000 mg/L; the aeration mode is micropore aeration; the concentration of dissolved oxygen at the water outlet of the primary aerobic tank is controlled to be 1-4 mg/L; in a specific embodiment, the concentration of dissolved oxygen at the water outlet of the primary aerobic tank is controlled to be 2-4mg/L, or 1-2 mg/L. The sludge sedimentation ratio in the primary aerobic tank is controlled to be 30-35%.
The rear part of the first-stage aerobic tank is preferably connected with a secondary sedimentation tank; the effluent of the first-stage aerobic tank enters a secondary sedimentation tank; after sedimentation and separation in the secondary sedimentation tank, part of sludge flows back to the primary aerobic tank to maintain the concentration of the sludge in the primary aerobic tank so as to ensure the desulfurization and denitrification effects; the reflux ratio of the secondary sedimentation tank is 100 percent.
The rear part of the secondary sedimentation tank is preferably connected with a secondary anaerobic tank (A); and the effluent of the secondary sedimentation tank enters a secondary A tank, and part of the effluent of the primary sedimentation tank is also introduced into a secondary anaerobic tank, so that a carbon source is provided for the heterotrophic denitrification process in the secondary anaerobic tank, and the total nitrogen is further removed. The value of dissolved oxygen in the secondary anaerobic tank is controlled to be 7.0-8.0 at 0.1-0.3mg/L, pH, and the surface of the tank is required to be free of floating mud. In a specific embodiment, the dissolved oxygen in the secondary anaerobic tank is 0.1-0.2mg/L, pH 7.0.0-8.0; or dissolved oxygen in the secondary anaerobic tank is 0.1-0.3mg/L, and the pH value is 7.6-8.0.
The rear part of the secondary anaerobic tank is preferably connected with a secondary aerobic (O) tank; and the effluent of the secondary anaerobic tank enters a secondary aerobic tank. And (3) adding a degreasing microbial inoculum into the secondary aerobic tank to further remove COD (chemical oxygen demand) generated by the animal oil and fat and further remove ammonia nitrogen. A degreasing microbial inoculum is added into the secondary aerobic tank; the degreasing homogenizing agent comprises yeast, bacillus atrophaeus, pseudomonas, bacillus cereus and streptomyces in a volume ratio of 5-15: 20-40: 30-60: 40-50: 5-10. The mass content of the degreasing microbial inoculum in the leather wastewater is preferably 1-5 g/L, and more preferably 2-4 g/L; in a specific embodiment, the mass content of the degreasing microbial inoculum in the leather wastewater is 2 g/L. And the second-stage aerobic tank is provided with nitrifying liquid for refluxing to the first-stage anaerobic tank and the second-stage anaerobic tank respectively, the reflux ratio is about 150-300%, and the preferred proportion is 1: 1. The sludge sedimentation ratio SV30 in the secondary aerobic tank is more than 30 percent. The concentration of dissolved oxygen in the secondary aerobic tank is 1.5-2.5 mg/L, and the pH value is 7.0-7.5; in a specific embodiment, the concentration of dissolved oxygen in the secondary aerobic tank is 1.5-2.0 mg/L; or 2.0-2.5 mg/L.
The rear part of the secondary aerobic tank is preferably connected with a tertiary sedimentation tank; and the effluent of the secondary aerobic tank enters a tertiary sedimentation tank, and sludge in the tertiary sedimentation tank flows back to the secondary aerobic tank so as to ensure the nitrification effect in the secondary aerobic tank.
For a sewage treatment system, the impact load comprises a hydraulic impact load and an organic impact load, wherein the hydraulic impact load is the amount of wastewater which can be treated per unit volume of filter material or per unit area per day; organic impact load, namely the organic matter added into a given biological treatment facility is organic load, and the improvement of the load and the impact resistance of biochemical treatment means that the biochemical system can still maintain higher treatment capacity when the water inflow of the system is suddenly increased or the water inflow of the system is unchanged but indexes are increased, so that the effluent index is reduced to a qualified level.
Compared with the prior art, the invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process. According to the method provided by the invention, the reagent is added for pretreatment while the adjusting tank is used for homogenizing and adjusting the quantity; a large amount of sulfur ions are generated by hydrolysis acidification, and then sulfur autotrophic denitrification is carried out by utilizing the sulfur ions and nitrate radicals in a first-level A pool; heterotrophic denitrification is carried out in the second-stage A pool, then two-stage aerobic treatment is adopted to realize complete nitrification, and high-temperature-resistant desulfurization microbial inoculum and degreasing microbial inoculum are added to improve the stability of the biochemical system. The method provided by the invention improves the load and impact resistance of biochemical treatment, more importantly realizes synchronous desulfurization and denitrification of leather wastewater, and updates the biochemical treatment technology. The method provided by the invention has the remarkable advantages of low investment and low cost, and is easy to popularize in the industry.
In order to further illustrate the present invention, the following examples are provided to describe the method for synchronously desulfurizing and denitrating leather wastewater by using the sulfur autotrophic denitrification process in detail, but they should not be construed as limiting the scope of the present invention.
Preparatory examples
(1) Desulfurization bacterial agent:
1) aerobic activated sludge of a biochemical system of a petrochemical wastewater treatment plant is taken as a strain source and is inoculated into a desulfurization microbial inoculum culture reactor, and the inoculation concentration is MLSS 2500-.
2) The sulfur-containing wastewater with 8000-.
3) The culture process adopts batch water feeding, and the desulfurization microbial inoculum promoter is supplemented while feeding water for each batch. Stopping aeration after reacting for 1d, naturally settling for 0.5-1h, discharging supernatant, leaving thalli, and then supplementing new sulfur-containing wastewater and inorganic salt accelerator into the reactor. When the removal rate of the sulfide is more than 80%, the concentration of the sulfur-containing wastewater is increased, the increasing range is 1-3 per mill each time, and when the concentration of the sulfur-containing wastewater reaches more than 5% and the removal rate of the sulfide is more than 80%, the sulfide degradation capacity of the desulfurization microbial inoculum reaches more than 200 mg/(L.d); and (5) finishing the preparation of the desulfurization microbial inoculum. Through identification, the desulfurization microbial inoculum comprises Candida tropicalis, Pichia pastoris, Bacillus pumilus and filamentous sulfur bacteria in a volume ratio of 20-40: 20-30: 10-20: 40-50.
(2) Degreasing bacteria agent:
1) aerobic activated sludge of a biochemical system of a leather wastewater treatment plant is taken as a strain source and is inoculated into a degreasing microbial inoculum culture reactor, and the inoculation concentration is MLSS 2500-.
2) Beef tallow is used as a domestication raw material to culture the desulfurization microbial inoculum, the pH is controlled to be 7.0-8.0, the temperature is controlled to be 20-35 ℃, and the DO is 2.0-4.0 mg/L.
3) The addition amount of the beef tallow is 50ppm, and the addition amount of the beef tallow is increased after each concentration gradient is stabilized for two periods, wherein the increase range of each time is 25-30 ppm. And completing the preparation of the degreasing microbial inoculum when the concentration of the beef tallow reaches 200ppm, the ammonia nitrogen of the effluent of the reactor is less than or equal to 5mg/L, and the COD is less than or equal to 400 mg/L.
Through identification, the degreasing homogenizing agent comprises saccharomycetes, bacillus badius, pseudomonas, bacillus cereus and streptomyces in a volume ratio of 5-15: 20-40: 30-60: 40-50: 5-10.
Example 1
Taking a sewage treatment system of a certain leather factory in Xin Ji city, Hebei province as an example, the average COD of the inlet water of the sewage treatment system is 15000-20000 mg/L, the concentration of ammonia nitrogen is 800-900 mg/L, the concentration of total nitrogen is 900-1000 mg/L, sulfide is 100-150mg/L, and the pH value is 8-10; the original treatment process is system water inlet → a primary sedimentation tank → an anaerobic tank → an aerobic tank → a secondary sedimentation tank → an anoxic tank → an aerobic tank → a final sedimentation tank, and the system treatment capacity is 1500m3And d. The specific process flow of this example is shown in fig. 1. The method comprises the following specific steps:
(1) the leather wastewater enters a regulating tank, polyferric sulfate is added, the adding amount is 200-300mg/L, the adding amount of PAM is 25-30mg/L, and partial sulfide is removed while the water quality is homogenized so as to reduce the toxic action of the sulfide on a subsequent biochemical system;
(2) the wastewater enters a hydrolysis acidification tank, and anaerobic microorganisms in the hydrolysis acidification tank can convert insoluble organic matters in the wastewater into soluble organic matters and also can convert macromolecular organic matters in the wastewater into micromolecular organic matters, so that the biodegradability of the wastewater is improved; more importantly, sulfate radicals are reduced into sulfur ions for autotrophic denitrification of a subsequent anoxic pond. The operation parameters of the hydrolysis acidification tank are as follows: 0.1-0.3mg/L of dissolved oxygen; controlling the pH value to be 6-7;
(3) the effluent of the hydrolysis acidification tank carrying a large amount of sulfur ions enters a first-level A tank, activated sludge in the A tank contains a large amount of sulfur autotrophic denitrifying bacteria, and can utilize the sulfur ions and nitrate radicals in nitrifying liquid to carry out denitrification, so that sulfides and total nitrogen are removed, the toxicity of a subsequent biochemical system is reduced, and the total nitrogen is removed at the same time. The operation parameters of the first-level pool A are as follows: controlling the pH value to be 7-8 and controlling the temperature to be 30-35 ℃; the concentration of dissolved oxygen at the water outlet of the pool A is controlled to be 0.1-0.3 mg/L.
(4) The sewage enters a primary O tank, and the activated sludge in the aerobic tank contains a large amount of ammonia nitrogen degrading bacteria, so that most of ammonia nitrogen and COD can be removed; and (3) adding the desulfurization microbial inoculum prepared in the preparation example in an amount of 3g/L, so that the shock resistance of the system is improved. The operating parameters of the first-level O pool are as follows: the concentration of the activated sludge is controlled to be 6000-8000 mg/L; the aeration mode is micropore aeration; controlling the concentration of dissolved oxygen at the water outlet to be 2-4 mg/L;
(5) the effluent of the first-stage O tank enters a secondary sedimentation tank, and after sedimentation and separation, part of sludge flows back to the first-stage anoxic tank, wherein the reflux ratio is 100%;
(6) and the secondary sedimentation effluent enters a secondary A tank, and part of the primary sedimentation tank effluent is introduced into the secondary A tank, so that a carbon source is provided for the heterotrophic denitrification process, and the total nitrogen is further removed. The operating parameters of the second-level A pool are as follows: dissolved oxygen: 0.1-0.3mg/L, pH 7.6.6-8.0, requiring no floating mud on the surface of the pond;
(7) and the effluent of the second-level A tank enters a second-level O tank, and a degreasing agent is added into the O tank to further remove COD (chemical oxygen demand) generated by animal fat and simultaneously further remove ammonia nitrogen. The dosage of the degreasing microbial inoculum is 2g/L, the second-stage O tank is provided with nitrifying liquid for backflow to the first-stage anoxic tank and the second-stage anoxic tank respectively, the backflow ratio is about 150-200%, and the distribution ratio is 1: 1. The operating parameters of the secondary O pool are as follows: dissolved oxygen: 2.0-2.5 mg/L, pH with a value of 7.0-7.5;
(8) and (4) allowing the water discharged from the second-stage O tank to enter a third sedimentation tank, performing sedimentation separation, allowing part of sludge to flow back to the second-stage O tank, and allowing part of sludge to precipitate until the supernatant at the bottom reaches the standard and is discharged.
Fig. 2 is a water outlet index variation graph of embodiment 1 of the present invention, and it can be known from fig. 2 that: under the water quality and the operation parameters of the inlet water, the device stably operates for 2 months, the COD of the outlet water is reduced to be below 300mg/L, the ammonia nitrogen is reduced to be below 20mg/L, the total nitrogen is reduced to be below 70mg/L, and the sulfide is reduced to be below 5mg/L, which all reach the discharge standard of water pollutants for the leather and fur processing industry GB 30486 plus 2013.
In the embodiment 1, after the method is adopted, (1) the water inflow of the system is from 1500m3Increase of d to 2000m3D, improving by 30%; (2) the water inlet index COD is 15000-20000 mg/L, the ammonia nitrogen concentration is 800-900 mg/L, the total nitrogen concentration is 900-1000 mg/L, and when sulfide fluctuates between 100-150mg/L, the effluent of the system can reach the discharge standard.
Example 2
The method is characterized in that waste water of a certain leather factory in Binzhou city, Shandong province is taken as a treatment object, the average COD is 10000-18000 mg/L, the concentration of ammonia nitrogen is 900-1000 mg/L, the concentration of total nitrogen is 1000-1200 mg/L, sulfide is 150-200mg/L, the pH is 8-9, the original sewage treatment process is system water inlet → an adjusting tank → a primary sedimentation tank → a hydrolysis acidification tank → an anoxic tank → an aerobic tank → a secondary sedimentation tank → external drainage, and the system treatment capacity is 1000m3And d. The method comprises the following specific steps:
(1) the leather wastewater enters a regulating tank, polyferric sulfate is added, the adding amount is 300-500 mg/L, the adding amount of PAM is 20-30 mg/L, and partial sulfide is removed while water quality is homogenized so as to reduce the toxic action of the sulfide on a subsequent biochemical system;
(2) the wastewater enters a hydrolysis acidification tank, and anaerobic microorganisms in the hydrolysis acidification tank can convert insoluble organic matters in the wastewater into soluble organic matters and also can convert macromolecular organic matters in the wastewater into micromolecular organic matters, so that the biodegradability of the wastewater is improved; more importantly, sulfate radicals are reduced into sulfur ions for autotrophic denitrification of a subsequent anoxic pond. The operation parameters of the hydrolysis acidification tank are as follows: 0.1-0.2mg/L of dissolved oxygen; controlling the pH value to be 5.8-6.8;
(3) the effluent of the hydrolysis acidification tank carrying a large amount of sulfur ions enters a first-level A tank, activated sludge in the A tank contains a large amount of sulfur autotrophic denitrifying bacteria, and can utilize the sulfur ions and nitrate radicals in nitrifying liquid to carry out denitrification, so that sulfides and total nitrogen are removed, the toxicity of a subsequent biochemical system is reduced, and the total nitrogen is removed at the same time. The operation parameters of the first-level pool A are as follows: controlling the pH value to be 7-8 and controlling the temperature to be 25-40 ℃; the concentration of dissolved oxygen at the water outlet of the pool A is controlled to be 0.2-0.3 mg/L.
(4) The sewage enters a primary O tank, and the activated sludge in the aerobic tank contains a large amount of ammonia nitrogen degrading bacteria, so that most of ammonia nitrogen and COD can be removed; the desulfurization microbial inoculum prepared in the preparation example is added with the addition amount of 5 per mill, so that the treatment capacity is rapidly improved when indexes such as sulfide in the water inlet of the system fluctuate, and the stability of the system is improved. The operating parameters of the first-level O pool are as follows: the concentration of the activated sludge is controlled to be 6000-7000 mg/L; the aeration mode is micropore aeration; the concentration of dissolved oxygen at the water outlet is controlled to be 1-2 mg/L;
(5) the effluent of the first-stage O tank enters a secondary sedimentation tank, and after sedimentation and separation, part of sludge flows back to the first-stage anoxic tank, wherein the reflux ratio is 100%;
(6) and the secondary sedimentation effluent enters a secondary A tank, and part of the primary sedimentation tank effluent is introduced into the secondary A tank, so that a carbon source is provided for the heterotrophic denitrification process, and the total nitrogen is further removed. The operating parameters of the second-level A pool are as follows: dissolved oxygen: 0.1-0.2mg/L, pH 7.0.0-8.0, requiring no floating mud on the surface of the pond;
(7) and the effluent of the second-level A tank enters a second-level O tank, and the degreasing microbial inoculum prepared in the preparation embodiment is added into the O tank to further remove COD (chemical oxygen demand) generated by animal fat and simultaneously further remove ammonia nitrogen. The adding amount of the degreasing microbial inoculum is 3g/L, the second-stage O tank is provided with nitrifying liquid for backflow, the nitrifying liquid flows back to the first-stage anoxic tank and the second-stage anoxic tank respectively, the backflow ratio is about 200-250%, and the distribution ratio is 1: 1. The operating parameters of the secondary O pool are as follows: dissolved oxygen: 1.5-2.0mg/L, pH7.0-7.5;
(8) and (4) allowing the water discharged from the second-stage O tank to enter a third sedimentation tank, performing sedimentation separation, allowing part of sludge to flow back to the second-stage O tank, and allowing part of sludge to precipitate until the supernatant at the bottom reaches the standard and is discharged.
Under the condition of the quality and the operation parameters of the inlet water, the device stably operates for 2 months, and the inlet water of the system is controlled to be 1000m3Lifting/d to 2000m3Water quality meansThe standard COD is 10000-18000 mg/L, the ammonia nitrogen concentration is 900-1000 mg/L, the total nitrogen concentration is 1000-1200 mg/L, the sulfide is 150-200mg/L, and when the pH value is 8-10 fluctuates, the COD of the effluent is reduced to below 300mg/L, the ammonia nitrogen is reduced to below 20mg/L, the total nitrogen is reduced to below 70mg/L, and the sulfide is reduced to below 5mg/L, which all reach the discharge standard of pollutants in water for the leather and fur processing industry GB 30486 plus 2013.
From the above embodiments, the invention provides a method for realizing synchronous desulfurization and denitrification of leather wastewater by using a sulfur autotrophic denitrification process, which comprises the following steps: treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank to obtain treated wastewater; the regulating tank comprises polymeric ferric sulfate and polyacrylamide; a desulfurization microbial inoculum is added into the primary aerobic tank; a degreasing microbial inoculum is added into the secondary aerobic tank; the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L. According to the invention, the medicament is added for pretreatment while the adjusting tank is used for homogenizing and adjusting the amount; a large amount of sulfur ions are generated by hydrolysis acidification, and then sulfur autotrophic denitrification is carried out by utilizing the sulfur ions and nitrate radicals in a first-level A pool; heterotrophic denitrification is carried out in the second-stage A pool, then two-stage aerobic treatment is adopted to realize complete nitrification, and synchronous desulfurization and denitrification of the leather wastewater are realized by adding a desulfurization microbial inoculum and a degreasing microbial inoculum; the stability of a biochemical system is also improved; the load and impact resistance of biochemical treatment are improved. The method provided by the invention has the remarkable advantages of low investment and low cost, and is easy to popularize in the industry. The experimental results show that: the device stably operates for 2 months, the COD of the effluent is reduced to be below 300mg/L, the ammonia nitrogen is reduced to be below 20mg/L, the total nitrogen is reduced to be below 70mg/L, and the sulfide is reduced to be below 5 mg/L; the water inlet of the system is lifted to 2000m3D; the water inlet index COD is 15000-20000 mg/L, the ammonia nitrogen concentration is 800-900 mg/L, the total nitrogen concentration is 900-1000 mg/L, and when sulfide fluctuates between 100 and 150mg/L, the effluent of the system can reach the discharge standard.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A method for realizing synchronous desulfurization and denitrification of leather wastewater by utilizing a sulfur autotrophic denitrification process comprises the following steps:
treating the leather wastewater by a regulating tank, a hydrolysis acidification tank, a primary anaerobic tank, a primary aerobic tank, a secondary anaerobic tank and a secondary aerobic tank to obtain treated wastewater;
polymeric ferric sulfate and polyacrylamide are added into the regulating tank; a desulfurization microbial inoculum is added into the primary aerobic tank; a degreasing microbial inoculum is added into the secondary aerobic tank;
the pH value in the first-stage anaerobic tank is 7.0-8.0, the temperature is 25-40 ℃, and the dissolved oxygen is 0.1-0.8 mg/L.
2. The method according to claim 1, wherein the polymeric ferric sulfate is added in an amount of 200-500 mg/L and the polyacrylamide is added in an amount of 10-30 mg/L in the regulating tank.
3. The method according to claim 1, wherein the desulfurization microbial inoculum comprises Candida tropicalis, Pichia pastoris, Bacillus pumilus and filamentous sulfur bacteria in a volume ratio of 20-40: 20-30: 10-20: 40-50;
the degreasing homogenizing agent comprises yeast, bacillus atrophaeus, pseudomonas, bacillus cereus and streptomyces in a volume ratio of 5-15: 20-40: 30-60: 40-50: 5-10.
4. The method as claimed in claim 1, wherein the concentration of the dissolved oxygen in the primary aerobic tank is 1-4 mg/L, and the sludge sedimentation ratio is controlled to be 30-35%.
5. The method as claimed in claim 1, wherein the concentration of the dissolved oxygen in the secondary aerobic tank is 1.5-2.5 mg/L, and the pH value is 7.0-7.5.
6. The method as claimed in claim 1, wherein the nitrifying liquid in the secondary aerobic tank flows back to the primary anaerobic tank and the secondary anaerobic tank respectively, the reflux ratio is 150-300%, and the proportion is 1: 1.
7. The method according to claim 1, characterized in that a primary sedimentation tank is arranged between the adjusting tank and the hydrolysis acidification tank, and part of effluent in the primary sedimentation tank is led to a secondary anaerobic tank.
8. The method according to claim 7, wherein the water outlet of the hydrolysis acidification tank is 0.1-0.4 mg/L of dissolved oxygen; the pH value is 6-7.
CN201911241924.XA 2019-12-06 2019-12-06 Method for realizing synchronous desulfurization and denitrification of leather wastewater by using sulfur autotrophic denitrification process Pending CN110902957A (en)

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