CN111559827A - Biological treatment method of desulfurization and denitrification tail liquid - Google Patents

Biological treatment method of desulfurization and denitrification tail liquid Download PDF

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CN111559827A
CN111559827A CN202010326937.3A CN202010326937A CN111559827A CN 111559827 A CN111559827 A CN 111559827A CN 202010326937 A CN202010326937 A CN 202010326937A CN 111559827 A CN111559827 A CN 111559827A
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denitrification
biological treatment
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desulfurization
tank
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CN111559827B (en
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不公告发明人
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Shandong yuntianyi New Material Technology Co.,Ltd.
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
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    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209Regulation methods for flocculation or precipitation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/02Temperature
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/06Controlling or monitoring parameters in water treatment pH
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/06Nutrients for stimulating the growth of microorganisms
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    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/2806Anaerobic processes using solid supports for microorganisms
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/301Aerobic and anaerobic treatment in the same reactor

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Abstract

The invention relates to the field of environmental protection, in particular to a biological treatment method of desulfurization and denitrification tail liquid; a chemical treatment section, a biological treatment section and a precipitation discharge section; the method adopts an anaerobic denitrification biological filler in an anaerobic tank of a biological treatment section, the filler contains a caprolactone modified starch material, can provide a carbon source for microorganisms, is easy to form a film and has higher anti-load capacity; the starting difficulty is reduced, and the smooth operation of biological treatment is ensured; in the anaerobic stage, nitrogen is introduced, so that hydrogen sulfide gas can be generated in the anaerobic organism treatment process, the hydrogen sulfide is prevented from inhibiting the growth of microorganisms, and an environment is created for the growth of the microorganisms; the biological method adopted by the method has the advantages of higher denitrification efficiency, less chemical agent feeding, less secondary pollution, controllable treatment cost and good application value.

Description

Biological treatment method of desulfurization and denitrification tail liquid
Technical Field
The invention relates to the field of environmental protection, in particular to a biological treatment method of desulfurization and denitrification tail liquid.
Background
China is rich in coal resources, and the coal resources are needed to be used in general industrial production and thermal power generation. A large amount of flue gas is generated by coal combustion, and after desulfurization and denitrification treatment is completed, tail liquid needs to be further treated by a thermal power plant so as not to pollute the environment
CN103723822B relates to a denitrification treatment method of flue gas denitration tail liquid, which comprises the steps of pretreating the flue gas denitration tail liquid, filtering to remove heavy metals and suspended matters in the flue gas denitration tail liquid, and obtaining the pretreated flue gas denitration tail liquid; then introducing the pretreated flue gas denitration tail liquid into an anaerobic ammonia oxidation reactor for anaerobic ammonia oxidation reaction to obtain nitrate nitrogen-containing flue gas denitration tail liquid; then introducing the flue gas denitration tail liquid containing nitrate nitrogen into an anoxic denitrification reactor through a second metering pump for denitrification reaction to obtain denitrified flue gas denitration tail liquid; the method has the advantages of simple treatment process, convenient operation, low cost, good denitrification effect, obvious economic benefit and environmental protection.
CN109384274A relates to a device and a method for denitration by using ammonia nitrogen waste liquid and kiln tail flue gas waste heat, the method comprises the following steps: (1) alkaline substances are used for adjusting the pH value of the ammonia nitrogen waste liquid, and kiln tail flue gas is used for steam stripping to obtain ammonia-containing flue gas; (2) introducing the ammonia-containing flue gas into a cement kiln decomposition furnace, and reducing nitrogen oxides in the flue gas in the kiln with reducing solution sprayed into the kiln to obtain kiln tail flue gas; (3) and (3) using the kiln tail flue gas obtained in the step (2) for steam stripping in the step (1). The denitration method can realize the utilization of the waste heat of the cement kiln tail flue gas and free ammonia in the ammonia nitrogen waste liquid, and reduce the consumption of SNCR denitration reducing agent, thereby realizing the purposes of reducing the denitration cost and the subsequent treatment cost of the ammonia nitrogen waste liquid.
CN105251326A relates to a reduction and oxidation combined denitration system, including SNCR denitrification facility, SCR denitrification facility and oxidation denitrification facility. The SNCR denitration device comprises a reducing agent storage device, a cyclone separator and a reducing agent injection device. The SCR denitration device comprises a reducing agent supplement amount control device and a denitration catalyst layer, wherein the denitration catalyst layer is arranged in the tail part of a boiler flue gas pipeline. The oxidation denitration device is connected with an outlet of a boiler flue gas pipeline through a flue gas pipeline and comprises an oxidation reaction device, a concentrated nitric acid absorption tower and an alkali liquor washing tower which are sequentially connected through the flue gas pipeline; and the oxidation denitration device carries out deep denitration treatment on the flue gas subjected to denitration treatment by the SNCR denitration device and the SCR denitration device. The invention also provides a method for denitration of boiler flue gas by using the system, and the method combines reduction denitration and oxidation denitration, so that the denitration effect is better, and the upgrading and the reconstruction of the original denitration system are facilitated.
The tail liquid of the flue gas desulfurization and denitration of the thermal power plant refers to residual discharged waste liquid in the wet desulfurization process of a flue gas preposed denitration (SCR method) postposition alkaline method, has the characteristics of high ammonia nitrogen, high salinity and low B/C, and has high concentration of total nitrogen and ammonia nitrogen (the total nitrogen can be up to 350-500 m g/L); high salinity, and high treatment difficulty of chloride (chloride ion up to 10000 mg/L) and sulfate (up to 4000-5000 mg/L). The above patents and the prior art generally adopt conventional physical treatment methods such as coagulation, precipitation, filtration and the like, and a biological treatment method is a very advantageous method for treating waste liquid, which is rarely used because of high salinity and low organic concentration of the desulfurization and denitrification tail liquid.
Disclosure of Invention
In order to solve the problems, the invention provides a biological treatment method of desulfurization and denitrification tail liquid.
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to be 9-12, stay for 10-15h by water power, then add a flocculating agent for flocculation, the addition amount of the flocculating agent is 180-320g/m3, perform air floatation treatment for 5-10min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic pond treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8-3.6g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5-7.5, the water temperature is 30-40 ℃, nitrogen is introduced at 0.5-5L/h, and the hydraulic retention time is 10-20 h; the facultative tank adopts a stirring mode, air is introduced at 0.1-1L/h, and the carbon source input amount per day is 5-20 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200-500g/L, and the aerobic tank is characterized in that the anaerobic tank adopts anaerobic denitrification biological filler;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide or polyaluminium chloride or polyferric sulfate.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50-100L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100-180mm, and the spherical shell is treated in a way that 1-5% by mass of triethanolamine borate aqueous solution is sprayed on the surface and the inner wall of the sphere and then treated for 20-30min under hot air at 70-90 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass portion, after uniformly mixing 60-80 portions of starch and 300-400 portions of dimethylformamide, controlling the temperature at 110-130 ℃, after heat preservation reaction for 2-5h, cooling to 70-90 ℃, slowly adding 30-40 portions of dimethylformamide containing 3.6-8.2 portions of acetic anhydride into a reaction kettle, after the addition, the reaction is carried out for 3 to 6 hours under the condition of heat preservation, the mixture is cooled, precipitated in water, filtered, washed, dried and evenly mixed with 40 to 60 parts of diethylene glycol dimethacrylate, the temperature is increased to 80 to 100 ℃, the mixture is continuously stirred for 10 to 20 minutes, then stirring the mixture with 3.1 to 5.7 parts of sodium naphthalenetrisulfonate for 10 to 30min, then adding 15-30 parts of caprolactone, controlling the temperature to be 100-140 ℃, reacting for 6-10h, and obtaining the caprolactone modified starch material after the reaction is finished.
The invention relates to a biological treatment method of desulfurization and denitrification tail liquid, which provides a biological treatment method of wastewater with high salinity and low organic matter concentration, namely the desulfurization and denitrification tail liquid, wherein the wastewater is harsh in biological environment, and the biological treatment method is generally difficult to start and operate; the starting difficulty is reduced, and the smooth operation of biological treatment is ensured; in the anaerobic stage, nitrogen is introduced, so that hydrogen sulfide gas can be generated in the anaerobic organism treatment process, the hydrogen sulfide is prevented from inhibiting the growth of microorganisms, and an environment is created for the growth of the microorganisms; the biological method adopted by the method has the advantages of higher denitrification efficiency, less chemical agent feeding, less secondary pollution, controllable treatment cost and good application value.
Detailed Description
The invention is further illustrated by the following specific examples:
in the experiment, various indexes of sample wastewater are detected according to a water and wastewater monitoring and analyzing method, including chemical oxygen demand, total nitrogen content, total phosphorus content, sulfate radical and ammonia nitrogen content.
Example 1
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 9, stay for 10 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 180g/m3, perform air floatation treatment for 5min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5, the water temperature is 30 ℃, nitrogen is introduced at 0.5L/h, and the hydraulic retention time is 10 h; the facultative tank adopts a stirring mode, air is introduced at 0.1L/h, and the carbon source input amount per day is 5 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100mm, and the spherical shell is treated in a way that 1% triethanolamine borate aqueous solution in parts by mass is sprayed on the surface and the inner wall of the sphere and then treated for 20min by hot air at 70 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass parts, after being uniformly mixed, 60kg of starch and 300kg of dimethylformamide are controlled at 110 ℃, the temperature is kept for 2h and the temperature is reduced to 70 ℃, 30kg of dimethylformamide containing 3.6kg of acetic anhydride is slowly added into a reaction kettle, after the addition is finished, the temperature is kept for reaction for 3h, the reaction is cooled, the precipitate is generated in water, the filtration and the washing are carried out, the mixture is dried and uniformly mixed with 40kg of diethylene glycol dimethacrylate, the temperature is increased to 80 ℃, the mixture is continuously stirred for 10min, then the mixture is stirred with 3.1kg of sodium naphthalene trisulfonate for 10min, then 15kg of caprolactone is added, the temperature is controlled at 100 ℃ and the reaction is carried out for 6h, and the caprolactone modified starch material can.
Example 2
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 11, stay for 13h in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 240g/m3, perform air floatation treatment for 8min after flocculation is completed, and then filter the treated liquid by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic pond treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 2.3g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 7, the water temperature is 35 ℃, nitrogen is introduced at 2.5L/h, and the hydraulic retention time is 15 h; the facultative tank adopts a stirring mode, air is introduced at 0.5L/h, and the carbon source input amount per day is 12 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 300g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is polyaluminium chloride.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 80L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 130mm, and the spherical shell is treated in a way that triethanolamine borate aqueous solution with the mass part of 3% is sprayed on the surface and the inner wall of the sphere and then treated for 25min under hot air at the temperature of 80 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass parts, after being uniformly mixed, 70kg of starch and 350kg of dimethylformamide are controlled at 120 ℃, the temperature is kept for 3h and the temperature is reduced to 80 ℃, 35kg of dimethylformamide containing 5.3kg of acetic anhydride is slowly added into a reaction kettle, after the addition is finished, the temperature is kept for 4h and the reaction is carried out for 4h, the temperature is cooled, the materials are precipitated in water, filtered and washed, dried and uniformly mixed with 50kg of diethylene glycol dimethacrylate, the temperature is increased to 90 ℃, the stirring is continued for 15min, then the materials are stirred with 4.2kg of sodium naphthalene trisulfonate for 20min, then 20kg of caprolactone is added, the temperature is controlled at 120 ℃ and the reaction is carried out for 8h, and the caprolactone modified starch material can be obtained.
Example 3
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 12, stay for 15 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 320g/m3, perform air floatation treatment for 10min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 3.6g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 7.5, the water temperature is 40 ℃, nitrogen is introduced at 5L/h, and the hydraulic retention time is 20 h; the facultative tank adopts a stirring mode, air is introduced at 1L/h, and the carbon source input amount per day is 20 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 500g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is polymeric ferric sulfate which is a polymeric flocculant.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 100L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 180mm, and the spherical shell is treated in a way that 5% by mass of triethanolamine borate aqueous solution is sprayed on the surface and the inner wall of the sphere and then treated for 30min by hot air at 90 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass parts, after being uniformly mixed, 80kg of starch and 400kg of dimethylformamide are controlled at 130 ℃, the temperature is kept for 5h and then is reduced to 90 ℃, 40kg of dimethylformamide containing 8.2kg of acetic anhydride is slowly added into a reaction kettle, after the addition is finished, the temperature is kept for reaction for 6h, the mixture is cooled, precipitated in water, filtered, washed, dried and uniformly mixed with 60kg of diethylene glycol dimethacrylate, the mixture is heated to 100 ℃ and continuously stirred for 20min, then is stirred with 5.7kg of sodium naphthalene trisulfonate for 30min, then 30kg of caprolactone is added, the temperature is controlled at 140 ℃ and the reaction is carried out for 10h, and the caprolactone modified starch material can be obtained after the reaction is finished.
Comparative example 1
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 9, stay for 10 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 180g/m3, perform air floatation treatment for 5min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5, the water temperature is 30 ℃, nitrogen is introduced at 0.5L/h, and the hydraulic retention time is 10 h; the facultative tank adopts a stirring mode, air is introduced at 0.1L/h, and the carbon source input amount per day is 5 g/L; the bottom of the aerobic tank is provided with a microporous aerator, air is supplied by an air blower, and the daily carbon source input amount is 200 g/L;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50L/h.
Comparative example 2
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 9, stay for 10 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 180g/m3, perform air floatation treatment for 5min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5, the water temperature is 30 ℃, nitrogen is introduced at 0.5L/h, and the hydraulic retention time is 10 h; the facultative tank adopts a stirring mode, air is introduced at 0.1L/h, and the carbon source input amount per day is 5 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100mm, and the spherical shell is treated for 20min by hot air at 70 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass parts, after being uniformly mixed, 60kg of starch and 300kg of dimethylformamide are controlled at 110 ℃, the temperature is kept for 2h and the temperature is reduced to 70 ℃, 30kg of dimethylformamide containing 3.6kg of acetic anhydride is slowly added into a reaction kettle, after the addition is finished, the temperature is kept for reaction for 3h, the reaction is cooled, the precipitate is generated in water, the filtration and the washing are carried out, the mixture is dried and uniformly mixed with 40kg of diethylene glycol dimethacrylate, the temperature is increased to 80 ℃, the mixture is continuously stirred for 10min, then the mixture is stirred with 3.1kg of sodium naphthalene trisulfonate for 10min, then 15kg of caprolactone is added, the temperature is controlled at 100 ℃ and the reaction is carried out for 6h, and the caprolactone modified starch material can.
Comparative example 3
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 9, stay for 10 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 180g/m3, perform air floatation treatment for 5min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5, the water temperature is 30 ℃, nitrogen is introduced at 0.5L/h, and the hydraulic retention time is 10 h; the facultative tank adopts a stirring mode, air is introduced at 0.1L/h, and the carbon source input amount per day is 5 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50L/h.
The anaerobic denitrification biological filler is a spherical shell; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100mm, and the spherical shell is treated in a way that 1% triethanolamine borate aqueous solution in parts by mass is sprayed on the surface and the inner wall of the sphere and then treated for 20min under hot air at 70 ℃.
Comparative example 4
A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is subjected to chemical treatment firstly, the chemical treatment is to add lime milk into the waste liquid to adjust the pH value to 9, stay for 10 hours in a hydraulic manner, then add a flocculating agent for flocculation, the adding amount of the flocculating agent is 180g/m3, perform air floatation treatment for 5min after flocculation is completed, and then filter the treatment by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic tank treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5, the water temperature is 30 ℃, and the hydraulic retention time is 10 hours; the facultative tank adopts a stirring mode, air is introduced at 0.1L/h, and the carbon source input amount per day is 5 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200g/L, and the anaerobic tank is characterized in that anaerobic denitrification biological filler is adopted;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
The flocculant is a polymeric flocculant polyacrylamide.
The sediment adopts a vertical flow sedimentation tank.
The filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
The gas inlet amount in the aerobic tank is 50L/h.
The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100mm, and the spherical shell is treated in a way that 1% triethanolamine borate aqueous solution in parts by mass is sprayed on the surface and the inner wall of the sphere and then treated for 20min by hot air at 70 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass parts, after being uniformly mixed, 60kg of starch and 300kg of dimethylformamide are controlled at 110 ℃, the temperature is kept for 2h and the temperature is reduced to 70 ℃, 30kg of dimethylformamide containing 3.6kg of acetic anhydride is slowly added into a reaction kettle, after the addition is finished, the temperature is kept for reaction for 3h, the reaction is cooled, the precipitate is generated in water, the filtration and the washing are carried out, the mixture is dried and uniformly mixed with 40kg of diethylene glycol dimethacrylate, the temperature is increased to 80 ℃, the mixture is continuously stirred for 10min, then the mixture is stirred with 3.1kg of sodium naphthalene trisulfonate for 10min, then 15kg of caprolactone is added, the temperature is controlled at 100 ℃ and the reaction is carried out for 6h, and the caprolactone modified starch material can.
The index data of the inlet water of the desulfurization and denitrification tail liquid and the treated wastewater treated in the above examples are shown in the following table:
item Chemical oxygen demand mg/L Total nitrogen content mg/L Total phosphorus content mg/L Sulfate radical content mg/L Ammonia nitrogen contentAmount mg/L Remarks for note
Inflow water 520.1 463.6 4.2 4382.1 234.5 --
Example 1 87.4 117.3 1.3 126.8 37.2 The operation is normal
Example 2 84.9 106.7 1.1 119.4 35.2 The operation is normal
Example 3 83.6 105.1 1.0 117.5 34.1 The operation is normal
Comparative example 1 722.3 381.7 3.5 3527.6 187.8 Failed start-up
Comparative example 2 135.8 154.6 2.6 384.6 69.2 The operation is normal
Comparative example 3 684.2 375.4 3.1 3481.7 178.3 Failed start-up
Comparative example 3 241.6 215.4 2.9 568.3 86.7 Operation in overload

Claims (6)

1. A biological treatment method of desulfurization and denitrification tail liquid comprises the following specific preparation scheme:
a chemical treatment section, wherein the desulfurization and denitrification tail liquid is firstly subjected to chemical treatment, and the chemical treatment is to add the desulfurization and denitrification tail liquid into the waste liquidAdjusting the pH value of the lime milk to 9-12, retaining for 10-15h by water power, and then adding a flocculating agent for flocculation, wherein the adding amount of the flocculating agent is 180-3After flocculation is finished, air floatation treatment is carried out for 5-10min, and then filtration is carried out by a filter;
and a biological treatment section, wherein the waste liquid after chemical treatment enters the biological treatment section, and the biological treatment section comprises: an anaerobic tank, a facultative tank and an aerobic tank; the anaerobic pond treatment adopts municipal anaerobic sludge as domesticated seed sludge, the concentration is 1.8-3.6g/L, the sludge inoculation is one-time inoculation, the pH value is controlled to be 6.5-7.5, the water temperature is 30-40 ℃, nitrogen is introduced at 0.5-5L/h, and the hydraulic retention time is 10-20 h; the facultative tank adopts a stirring mode, air is introduced at 0.1-1L/h, and the carbon source input amount per day is 5-20 g/L; the bottom of the aerobic tank is provided with a microporous aerator which supplies air through an air blower, and the daily carbon source input amount is 200-500g/L, and the aerobic tank is characterized in that the anaerobic tank adopts anaerobic denitrification biological filler;
and a sedimentation discharge section, wherein the wastewater after biological treatment enters a sedimentation tank, supernatant is discharged after sedimentation, and sediment is dewatered to form sludge and discharged.
2. The biological treatment method of the desulfurization and denitrification tail liquid according to claim 1, which is characterized in that: the flocculant is a polymeric flocculant polyacrylamide or polyaluminium chloride or polyferric sulfate.
3. The biological treatment method of the desulfurization and denitrification tail liquid according to claim 1, which is characterized in that: the sediment adopts a vertical flow sedimentation tank.
4. The biological treatment method of the desulfurization and denitrification tail liquid according to claim 1, which is characterized in that: the filter adopts a ceramic sand double-layer filter material system, and the dirt intercepting capability of the filter material is ensured by regular back washing.
5. The biological treatment method of the desulfurization and denitrification tail liquid according to claim 1, which is characterized in that: the gas inlet amount in the aerobic tank is 50-100L/h.
6. The anaerobic denitrification biological filler is composed of a spherical shell and an inner wall filler; the spherical shell is a hollow sphere made of polyvinyl chloride, the diameter of the spherical shell is 100-180mm, and the spherical shell is treated in a way that 1-5% by mass of triethanolamine borate aqueous solution is sprayed on the surface and the inner wall of the sphere and then treated for 20-30min under hot air at 70-90 ℃;
the inner wall filler is a caprolactone modified starch material, and the preparation method comprises the following steps:
according to the mass portion, after uniformly mixing 60-80 portions of starch and 300-400 portions of dimethylformamide, controlling the temperature at 110-130 ℃, after heat preservation reaction for 2-5h, cooling to 70-90 ℃, slowly adding 30-40 portions of dimethylformamide containing 3.6-8.2 portions of acetic anhydride into a reaction kettle, after the addition, the reaction is carried out for 3 to 6 hours under the condition of heat preservation, the mixture is cooled, precipitated in water, filtered, washed, dried and evenly mixed with 40 to 60 parts of diethylene glycol dimethacrylate, the temperature is increased to 80 to 100 ℃, the mixture is continuously stirred for 10 to 20 minutes, then stirring the mixture with 3.1 to 5.7 parts of sodium naphthalenetrisulfonate for 10 to 30min, then adding 15-30 parts of caprolactone, controlling the temperature to be 100-140 ℃, reacting for 6-10h, and obtaining the caprolactone modified starch material after the reaction is finished.
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