CN114084950A - Slaughtering and meat processing industrial wastewater treatment device and operation method thereof - Google Patents

Slaughtering and meat processing industrial wastewater treatment device and operation method thereof Download PDF

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CN114084950A
CN114084950A CN202111469056.8A CN202111469056A CN114084950A CN 114084950 A CN114084950 A CN 114084950A CN 202111469056 A CN202111469056 A CN 202111469056A CN 114084950 A CN114084950 A CN 114084950A
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water
reactor
zone
concentration
effluent
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鲍林林
张梦姣
罗亚红
马凯丽
蔡婉婷
李怡
王碧燕
牛云培
张金涛
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Henan Normal University
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/006—Regulation methods for biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time

Abstract

The invention discloses a slaughter and meat processing industrial wastewater treatment device and an operation method thereof, which comprises an improvement A connected in sequence through pipelines2In a/O reactor and a SNAD autotrophic denitrification reactor, improvement of2The method comprises the steps of operating a short-cut nitrification and denitrification dephosphorization process in an/O reactor, completing the screening and aggregation of AOB by controlling dissolved oxygen and sludge age, realizing the stable operation of short-cut nitrification, enriching denitrification phosphorus-accumulating bacteria by prolonging the sludge age, starting the denitrification dephosphorization process, and finally enabling most of ammonia nitrogen, COD and TP to be improved A2the/O reactor was removed. The process of shortcut nitrification, anaerobic ammonia oxidation and denitrification is operated in the SNAD autotrophic denitrification reactor, and the enhanced removal of ammonia nitrogen, total nitrogen and COD is realized by controlling proper dissolved oxygen and temperature.

Description

Slaughtering and meat processing industrial wastewater treatment device and operation method thereof
Technical Field
The invention belongs to the technical field of industrial wastewater treatment devices and operation methods, and particularly relates to a slaughter and meat processing industrial wastewater treatment device and an operation method thereof.
Background
With the rapid development of the meat processing industry, the proportion of slaughter and meat processing wastewater in industrial wastewater is increased year by year, the slaughter wastewater mainly comes from the fence washing and leaching, the slaughtered meat and viscera cleaning water, the slaughter equipment and workshop ground washing water and the like, belongs to high-concentration organic wastewater, and has the characteristics of large water quality and water quantity change, high organic matter content and good biodegradability, and the wastewater contains various pollution factors such as COD (chemical oxygen demand), SS (suspended substances), ammonia nitrogen, enterogastric bacteria and the like, and if the pollution factors are directly discharged without being subjected to harmless treatment, the wastewater inevitably causes great harm to a natural nitrogen circulation system and an ecological system. In the face of this situation, development and application of economical and efficient biological sewage treatment technologies are urgently needed.
At the present stage, the nitrogen and phosphorus removal process of the industrial sewage treatment plant in China generally has the defects of high energy consumption, low removal efficiency and unstable operation, how to improve the removal effect of nitrogen and phosphorus removal and save energy consumption so as to solve the increasingly serious water pollution problem in China, and the nitrogen and phosphorus removal process has great significance in aspects of saving capital, improving the sewage treatment effect, optimizing the sewage nitrogen and phosphorus removal process and the like at the present stage in China.
Disclosure of Invention
The invention aims to provide a slaughter and meat processing industrial wastewater treatment device capable of removing carbon, nitrogen and phosphorus in wastewater with high efficiency and low energy consumption and an operation method thereof.
The present invention adopts the following techniques to solve the above problemsTechnical scheme, a slaughtering and meat processing industrial wastewater treatment device, which is characterized by comprising an improved A connected with each other through a pipeline in sequence2In a/O reactor and a SNAD autotrophic denitrification reactor, wherein A is improved2the/O reactor consists of a reaction tank and a sedimentation tank which are sequentially connected through a pipeline, the reaction tank is sequentially divided into an anaerobic zone, an anoxic zone, an aerobic zone I, an aerobic zone II and an intermittent aeration zone by a partition plate along the water inlet direction, through holes are respectively arranged at the upper part and the lower part of the adjacent partition plate and are used for realizing the baffling effect of wastewater in each reaction zone of the reaction tank, the aerobic zone II is communicated with the anoxic zone through a mixed liquid reflux peristaltic pump and a pipeline to realize the reflux of the mixed liquid, the intermittent aeration zone is communicated with the anaerobic zone through a sludge reflux peristaltic pump and a pipeline to realize the reflux of sludge, stirring devices are respectively arranged in the anaerobic zone and the anoxic zone, microporous aeration devices are respectively arranged in the aerobic zone I, the aerobic zone II and the intermittent aeration zone, the microporous aeration devices are respectively connected with an air pump through a pipeline and a flowmeter, a timing control valve is arranged on an air inlet pipeline of the microporous aeration devices in the intermittent aeration zone, the aeration quantity is controlled by an air pump and a flowmeter during the operation period to enable the activated sludge to be in a suspension state, the aeration state is controlled by a timing control valve in an intermittent aeration zone, and a sludge discharge port and a residual sludge discharge port are respectively arranged at the intermittent aeration zone and the bottom of the sedimentation tank; improvement A2An overflow water outlet of a sedimentation tank in the/O reactor is connected with a water inlet of the SNAD autotrophic nitrogen removal reactor through a pipeline, the inside of the SNAD autotrophic nitrogen removal reactor is divided into six baffle plate reaction tanks which are connected in series by partition plates along the water inlet direction, the adjacent baffle plate reaction tanks are communicated through overflow weirs, each baffle plate reaction tank is divided into two large and small chambers with the volume ratio of 3:1 and the bottom communicated through a baffle plate, a hydroformylation silk fiber filler bound by hollow plastic rings is suspended and filled in the large chamber, heating rods and a microporous aeration device are arranged in the first three small chambers, after raw water enters the SNAD autotrophic nitrogen removal reactor, water flows downwards in the small chambers and flows upwards in the large chambers so as to achieve the purpose of fully uniformly mixing and contacting muddy water, and gas generated in the reaction process escapes from the top of the SNAD autotrophic nitrogen removal reactor.
The invention relates to an operation method of a slaughter and meat processing industrial wastewater treatment device, which is characterized by comprising the following specific steps:
step S1: starting of short-cut nitrification and denitrification process
Taking the effluent of a secondary hydrolysis acidification pool of a slaughter and meat processing mixed wastewater sewage plant as the raw water of inlet water, wherein the concentration of ammonia nitrogen in the inlet water is 160mg/L, the concentration of nitrite in the inlet water is less than 1mg/L, the concentration of nitrate in the inlet water is less than 2mg/L, the pH value of the inlet water is 6.8-7.5, the inlet water temperature is 19-20 ℃, and the improvement A is implemented2Activated sludge in an SBR pool is inoculated in an/O bioreactor, the sludge concentration is 4000MLSS/L, the dissolved oxygen amount of an aerobic zone I and an aerobic zone II of a reaction pool are controlled to be 1.0mg/L, the temperature of the reaction pool is controlled by a heating rod, during the test operation, the temperature of an anaerobic zone of the reaction pool is 20 ℃, the temperature of an anoxic zone of the reaction pool is 23 ℃, the temperatures of an aerobic zone I and an aerobic zone II of the reaction pool are 23 ℃, the sludge reflux ratio in a sedimentation pool is 90%, the reflux ratio of mixed liquid in the aerobic zone II of the reaction pool is 240%, the hydraulic retention time is 8h, the sludge age is 5d, the sludge discharge amount is 4.5L/d, the mixed liquid in the sedimentation pool and the aerobic zone II of the reaction pool are continuously cultured by a peristaltic pump to the anaerobic zone and the anoxic zone respectively, the water quality is changed at the later stage of start, the average ammonia nitrogen concentration of inlet water reaches 190mg/L, the COD load of inlet water increases to 1000mg/L, the sludge denitrification of the intermittent aeration zone and the sedimentation tank of the reaction tank is serious, the process operation parameters are adjusted, the dissolved oxygen quantity of the aerobic zone I and the aerobic zone II of the reaction tank are controlled to be 2mg/L, activated sludge is supplemented to the anaerobic zone of the reaction tank, after 20 days of continuous culture, the short-cut nitrification is successfully started, then the hydraulic retention time is adjusted to 10h, the improvement A is that2the/O bioreactor stably runs, the average concentration of nitrite nitrogen in effluent is 20mg/L, the average concentration of ammonia nitrogen in effluent is lower than 50mg/L, the average concentration of COD in effluent is 190mg/L, and the removal of COD and ammonia nitrogen in the biological denitrification process is mainly because the microorganism growth needs, the low dissolved oxygen is controlled during the running period, so that the energy consumption of the reactor is greatly reduced, and simultaneously, favorable conditions are created for the subsequent autotrophic denitrification;
step S2: starting denitrifying phosphorus removal process
Under the conditions that the COD concentration of inlet water is 1000mg/L, the ammonia nitrogen concentration of inlet water is 190mg/L, the total phosphorus concentration of inlet water is 28-32mg/L, the shortcut nitrification is successfully started and stably operated, the inlet water flow is controlled to be 7.0L/h, the sludge age is controlled to be 15d by reducing the sludge discharge to 1.5L/d, the hydraulic retention time is 10h, the dissolved oxygen content of an aerobic zone I and an aerobic zone II of a reaction tank is reduced to 1.0-1.5mg/L, the reflux ratio of mixed liquid in the aerobic zone II of the reaction tank is controlled to be 300%, denitrifying phosphorus accumulating bacteria are successfully enriched after 20 days of continuous culture, the denitrifying phosphorus removal process achieves stable operation, the phosphorus absorption amount of an anoxic zone of the reaction tank is up to 20.5mg/L, the phosphorus absorption removal rate is up to 64%, part of phosphorus is absorbed by aerobic bacteria, and the total phosphorus concentration of outlet water is about 8.9mg/L, the biological phosphorus removal reactor is successfully started;
step S3: start-up of autotrophic nitrogen removal process
The ammonia nitrogen concentration of the inlet water is kept at 50mg/L, the COD concentration of the inlet water is kept at 50mg/L, the pH value of the whole reaction is controlled at 7.5-8.0, the temperature is 30 ℃, and the method is specifically divided into two stages: the first stage is the starting of CANON, and the specific operation is as follows: inoculating anaerobic ammonium oxidation sludge into a baffle plate reaction tank, performing biofilm culturing on a biological membrane, and artificially distributing water for experiment inflow, wherein the components are as follows: tap water, industrial ammonium chloride, ammonium nitrite and sodium bicarbonate, wherein the inlet water quality keeps the concentration ratio of ammonia nitrogen to nitrite at 1:1, the hydraulic retention time is 10h, the continuous culture is carried out for 20 days, the reactor operates stably, the outlet water ammonia nitrogen concentration is less than 4mg/L, the average outlet water ammonia nitrogen removal rate is 91%, the total outlet water nitrogen removal rate reaches more than 81%, when the total outlet water nitrogen removal rate reaches more than 80% continuously for 7d, the biomembrane in the autotrophic denitrification reactor is basically stable, the anaerobic ammonia oxidation biomembrane in the baffled plate reaction tank is successfully cultured preliminarily, then the feeding of nitrite into the reactor is stopped, meanwhile, the aeration is carried out on the first three cells of the baffled plate reaction tank, the aeration mode is that the aeration is gradually reduced along the water flow direction, the aeration quantity is controlled to be 0.4L/min, 0.3L/min and 0.2L/min in sequence, and the acclimation is carried out for 90 days, the concentration of the effluent ammonia nitrogen and the concentration of the effluent total nitrogen are respectively 1.9mg/L and 12.0mg/L, the average removal rate of the effluent ammonia nitrogen and the effluent total nitrogen is respectively 94.5 percent and 75 percent, and the removal load of the reactor nitrogen reaches 0.21kg/m3D, when the total nitrogen removal rate of the effluent reaches more than 75% after 10 consecutive days, considering that the CANON start is successful; second stageIs the start of SNAD, the SNAD, namely short-cut nitrification-anaerobic ammonia oxidation-denitrification, is realized in one reactor, and the simulated improvement of the test raw water A2In order to ensure the stability of the quality of inlet water, the outlet water quality of the/O short-range nitrification and denitrification dephosphorization reactor is diluted by domestic sewage, industrial ammonium chloride, sodium nitrite and sodium bicarbonate are added into the domestic sewage according to a specific proportion, the aeration amount of the cells of the four baffle plate reaction tanks in the starting stage is controlled to be 0.35L/min, 0.3L/min, 0.15L/min and 0.1L/min in sequence, the HRT is 6h, the test is continuously carried out for 130 days, the SNAD reactor is successfully started, finally after the outlet water is stable, the average concentrations of outlet ammonia nitrogen, outlet total nitrogen and outlet COD are respectively 2mg/L, 6mg/L and 15mg/L, and the average removal rates of the outlet ammonia nitrogen, the outlet total nitrogen and the outlet COD are respectively 95%, 85% and 70%;
step S4: combination of short-cut nitrification and denitrification process and autotrophic nitrogen removal process
The experiment uses the effluent of the comprehensive adjusting tank of the industrial wastewater of slaughtering and meat processing as raw water, a hydrolysis acidification tank and an oil separation tank are arranged in front of the comprehensive adjusting tank, the water and oil separation of the oil separation tank and the hydrolysis of the hydrolysis acidification tank buffer the fluctuation of the incoming water, and further realize the relatively stable quality of the inlet water of the reactor, thereby ensuring the improvement of A2The stable operation of the/O and SNAD combined process has the influent ammonia nitrogen concentration of about 190mg/L, the influent nitrite concentration of less than 1mg/L, the influent total phosphorus concentration of 28-32mg/L, the influent COD concentration of 1000mg/L, the influent pH of about 7.0, the influent temperature of 23 ℃, and the improvement of A2the/O short-cut nitrification and denitrification dephosphorization reactor plays a main role in the denitrification and COD removal process of sewage treatment, and the SNAD reactor plays a role in strengthening removal of total nitrogen, ammonia nitrogen and COD, so that the effluent quality is effectively ensured, and A is improved2The average concentrations of the effluent ammonia nitrogen and the effluent COD of the/O and SNAD combined process are respectively 8.9mg/L and 35mg/L, the average removal rate of the effluent COD is 96%, the average removal rate of the effluent ammonia nitrogen is 95%, the average removal rate of the effluent total nitrogen is 91.1%, and the average removal rate of the effluent total phosphorus is 65.7%.
Compared with the prior art, the invention has the following advantages and beneficial effects: the invention relates to a slaughter and meat processing industrial wastewater treatment deviceDevice comprises an improvement A2In the improvement of A/O reactor and SNAD autotrophic denitrification reactor2The method comprises the steps of operating a short-cut nitrification and denitrification dephosphorization process in an/O reactor, completing the screening and aggregation of AOB by controlling dissolved oxygen and sludge age, realizing the stable operation of short-cut nitrification, enriching denitrification phosphorus-accumulating bacteria by prolonging the sludge age, starting the denitrification dephosphorization process, and finally enabling most of ammonia nitrogen, COD and TP to be improved A2the/O reactor was removed. The short-cut nitrification, anaerobic ammonia oxidation and denitrification processes are operated in the SNAD reactor, and the ammonia nitrogen and the total nitrogen are intensively removed and part of COD is removed by controlling proper dissolved oxygen and temperature.
The device for treating the industrial wastewater of slaughtering and meat processing takes the effluent of the comprehensive adjusting tank of the industrial wastewater of slaughtering and meat processing as raw water, and improves A2After the combination process of the/O and the SNAD, the average concentration of ammonia nitrogen and COD in the effluent are respectively 8.9mg/L and 35mg/L, the average removal rate of the COD is 96%, the average removal rate of the ammonia nitrogen is 95%, the removal rate of the total nitrogen is 91.1%, and the average removal rate of the total phosphorus is 65.7%, wherein the removal effect of the ammonia nitrogen and the COD reaches the first-level industrial standard of the discharge Standard of pollutants for Water in the meat processing industry (GB 13457-92).
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for treating waste water from the slaughtering and meat processing industries according to the present invention.
In the figure: 1-water inlet pump, 2-stirring device, 3-microporous aeration device, 4-flowmeter, 5-timing control valve, 6-air pump, 7-anaerobic zone, 8-anoxic zone, 9-aerobic zone I, 10-aerobic zone II, 11-intermittent aeration zone, 12-sedimentation tank, 13-overflow outlet, 14-mixed liquid reflux peristaltic pump, 15-sludge discharge port, 16-residual sludge discharge port, 17-sludge reflux peristaltic pump, 18-baffle reaction tank, 19-hydroformylation silk fiber filler and 20-heating rod.
Detailed Description
The details of the present invention are described in detail with reference to the accompanying drawings. As shown in FIG. 1, a slaughtering and meat processing industrial wastewater treatment plant comprises improvements A connected in sequence through pipelines2In a/O reactor and a SNAD autotrophic denitrification reactor, wherein A is improved2O reactionThe reactor consists of a reaction tank and a sedimentation tank 12 which are sequentially connected through a pipeline, the reaction tank is sequentially divided into an anaerobic zone 7, an anoxic zone 8, an aerobic zone I9, an aerobic zone II 10 and an intermittent aeration zone 11 by partition plates along the water inlet direction, through holes are respectively arranged at the upper part and the lower part of the adjacent partition plates and are used for realizing the baffling effect of wastewater in each reaction zone of the reaction tank, the aerobic zone II 10 is communicated with the anoxic zone 8 through a mixed liquid reflux peristaltic pump 14 and a pipeline to realize the reflux of the mixed liquid, the intermittent aeration zone 11 is communicated with the anaerobic zone 7 through a sludge reflux peristaltic pump 17 and a pipeline to realize the reflux of sludge, stirring devices 2 are respectively arranged in the anaerobic zone 7 and the anoxic zone 8, microporous aeration devices 3 are respectively arranged in the aerobic zone I9, the aerobic zone II 10 and the intermittent aeration zone 11, and the microporous aeration devices 3 are respectively connected with an air pump 6 through pipelines and a flowmeter 4, a timing control valve 5 is arranged on an air inlet pipeline of the microporous aeration device 3 in the intermittent aeration zone 11, the aeration quantity is controlled by an air pump 6 and a flow meter 4 during the operation period to enable the activated sludge to be in a suspension state, the intermittent aeration zone 11 controls the aeration state by the timing control valve 5, and a sludge discharge port 15 and a residual sludge discharge port 16 are respectively arranged at the bottoms of the intermittent aeration zone 11 and the sedimentation tank 12; improvement A2An overflow water outlet of a sedimentation tank in an/O reactor is connected with a water inlet of an SNAD autotrophic nitrogen removal reactor through a pipeline, the inside of the SNAD autotrophic nitrogen removal reactor is divided into six baffle plate reaction tanks 18 which are connected in series by partition plates along the water inlet direction, the adjacent baffle plate reaction tanks 18 are communicated through an overflow weir, each baffle plate reaction tank 18 is divided into a large cell and a small cell by a baffle plate, the large cell is internally suspended and filled with hydroformylation silk fiber fillers 19 bound by hollow plastic rings, heating rods 20 and a micropore aeration device are arranged in the first three small cells, after raw water enters the SNAD autotrophic nitrogen removal reactor, the water flows downwards in the small cells and flows upwards in the large cells to achieve the full uniform mixing contact of muddy water, and gas generated in the reaction process escapes from the top of the SNAD autotrophic nitrogen removal reactor.
The invention relates to an operation method of a slaughter and meat processing industrial wastewater treatment device, which comprises the following specific steps:
step S1: starting of short-cut nitrification and denitrification process
Taking the effluent of a secondary hydrolysis acidification pool of a slaughter and meat processing mixed wastewater sewage plant as the raw water of inlet water, wherein the concentration of ammonia nitrogen in the inlet water is 160mg/L, the concentration of nitrite in the inlet water is less than 1mg/L, the concentration of nitrate in the inlet water is less than 2mg/L, the pH value of the inlet water is 6.8-7.5, the inlet water temperature is 19-20 ℃, and the improvement A is implemented2Activated sludge in an SBR pool is inoculated in an/O bioreactor, the sludge concentration is 4000MLSS/L, the dissolved oxygen amount of an aerobic zone I and an aerobic zone II of a reaction pool are controlled to be 1.0mg/L, the temperature of the reaction pool is controlled by a heating rod, during the test operation, the temperature of an anaerobic zone of the reaction pool is 20 ℃, the temperature of an anoxic zone of the reaction pool is 23 ℃, the temperatures of an aerobic zone I and an aerobic zone II of the reaction pool are 23 ℃, the sludge reflux ratio in a sedimentation pool is 90%, the reflux ratio of mixed liquid in the aerobic zone II of the reaction pool is 240%, the hydraulic retention time is 8h, the sludge age is 5d, the sludge discharge amount is 4.5L/d, the mixed liquid in the sedimentation pool and the aerobic zone II of the reaction pool are continuously cultured by a peristaltic pump to the anaerobic zone and the anoxic zone respectively, the water quality is changed at the later stage of start, the average ammonia nitrogen concentration of inlet water reaches 190mg/L, the COD load of inlet water increases to 1000mg/L, the sludge denitrification of the intermittent aeration zone and the sedimentation tank of the reaction tank is serious, the process operation parameters are adjusted, the dissolved oxygen quantity of the aerobic zone I and the aerobic zone II of the reaction tank are controlled to be 2mg/L, activated sludge is supplemented to the anaerobic zone of the reaction tank, after 20 days of continuous culture, the short-cut nitrification is successfully started, then the hydraulic retention time is adjusted to 10h, the improvement A is that2the/O bioreactor stably runs, the average concentration of nitrite nitrogen in effluent is 20mg/L, the average concentration of ammonia nitrogen in effluent is lower than 50mg/L, the average concentration of COD in effluent is 190mg/L, and the removal of COD and ammonia nitrogen in the biological denitrification process is mainly because the microorganism growth needs, the low dissolved oxygen is controlled during the running period, so that the energy consumption of the reactor is greatly reduced, and simultaneously, favorable conditions are created for the subsequent autotrophic denitrification;
step S2: starting denitrifying phosphorus removal process
Under the conditions that the COD concentration of inlet water is 1000mg/L, the ammonia nitrogen concentration of inlet water is 190mg/L, the total phosphorus concentration of inlet water is 28-32mg/L, the shortcut nitrification is successfully started and stably operated, the inlet water flow is controlled to be 7.0L/h, the sludge age is controlled to be 15d by reducing the sludge discharge to 1.5L/d, the hydraulic retention time is 10h, the dissolved oxygen content of an aerobic zone I and an aerobic zone II of a reaction tank is reduced to 1.0-1.5mg/L, the reflux ratio of mixed liquid in the aerobic zone II of the reaction tank is controlled to be 300%, denitrifying phosphorus accumulating bacteria are successfully enriched after 20 days of continuous culture, the denitrifying phosphorus removal process achieves stable operation, the phosphorus absorption amount of an anoxic zone of the reaction tank is up to 20.5mg/L, the phosphorus absorption removal rate is up to 64%, part of phosphorus is absorbed by aerobic bacteria, and the total phosphorus concentration of outlet water is about 8.9mg/L, the biological phosphorus removal reactor is successfully started;
step S3: start-up of autotrophic nitrogen removal process
The ammonia nitrogen concentration of the inlet water is kept at 50mg/L, the COD concentration of the inlet water is kept at 50mg/L, the pH value of the whole reaction is controlled at 7.5-8.0, the temperature is 30 ℃, and the method is specifically divided into two stages: the first stage is the starting of CANON, and the specific operation is as follows: inoculating anaerobic ammonium oxidation sludge into a baffle plate reaction tank, performing biofilm culturing on a biological membrane, and artificially distributing water for experiment inflow, wherein the components are as follows: tap water, industrial ammonium chloride, ammonium nitrite and sodium bicarbonate, wherein the inlet water quality keeps the concentration ratio of ammonia nitrogen to nitrite at 1:1, the hydraulic retention time is 10h, the continuous culture is carried out for 20 days, the reactor operates stably, the outlet water ammonia nitrogen concentration is less than 4mg/L, the average outlet water ammonia nitrogen removal rate is 91%, the total outlet water nitrogen removal rate reaches more than 81%, when the total outlet water nitrogen removal rate reaches more than 80% continuously for 7d, the biomembrane in the autotrophic denitrification reactor is basically stable, the anaerobic ammonia oxidation biomembrane in the baffled plate reaction tank is successfully cultured preliminarily, then the feeding of nitrite into the reactor is stopped, meanwhile, the aeration is carried out on the first three cells of the baffled plate reaction tank, the aeration mode is that the aeration is gradually reduced along the water flow direction, the aeration quantity is controlled to be 0.4L/min, 0.3L/min and 0.2L/min in sequence, and the acclimation is carried out for 90 days, the concentration of the effluent ammonia nitrogen and the concentration of the effluent total nitrogen are respectively 1.9mg/L and 12.0mg/L, the average removal rate of the effluent ammonia nitrogen and the effluent total nitrogen is respectively 94.5 percent and 75 percent, and the removal load of the reactor nitrogen reaches 0.21kg/m3D, when the total nitrogen removal rate of the effluent reaches more than 75% after 10 consecutive days, considering that the CANON start is successful; the second stage is the start of SNAD, the SNAD is realized in one reactor, the simulation improvement of raw water A2/O short-cut nitrification and denitrificationDiluting the effluent water quality of the chemical dephosphorization reactor by using domestic sewage, adding industrial ammonium chloride, sodium nitrite and baking soda into the domestic sewage according to a specific proportion, controlling aeration amounts of cells of the four baffle reaction tanks to be 0.35L/min, 0.3L/min, 0.15L/min and 0.1L/min in sequence in a starting stage, HRT to be 6h, continuously carrying out the test for 130 days, successfully starting the SNAD reactor, and finally ensuring that the average concentrations of effluent ammonia nitrogen, effluent total nitrogen and effluent COD are respectively 2mg/L, 6mg/L and 15mg/L after the effluent water is stable, and ensuring that the average removal rates of the effluent ammonia nitrogen, the effluent total nitrogen and the effluent COD are respectively 95%, 85% and 70%;
step S4: combination of short-cut nitrification and denitrification process and autotrophic nitrogen removal process
The experiment uses the effluent of the comprehensive adjusting tank of the industrial wastewater of slaughtering and meat processing as raw water, a hydrolysis acidification tank and an oil separation tank are arranged in front of the comprehensive adjusting tank, the water and oil separation of the oil separation tank and the hydrolysis of the hydrolysis acidification tank buffer the fluctuation of the incoming water, and further realize the relatively stable quality of the inlet water of the reactor, thereby ensuring the improvement of A2The stable operation of the/O and SNAD combined process has the influent ammonia nitrogen concentration of about 190mg/L, the influent nitrite concentration of less than 1mg/L, the influent total phosphorus concentration of 28-32mg/L, the influent COD concentration of 1000mg/L, the influent pH of about 7.0, the influent temperature of 23 ℃, and the improvement of A2the/O short-cut nitrification and denitrification dephosphorization reactor plays a main role in the denitrification and COD removal process of sewage treatment, and the SNAD reactor plays a role in strengthening removal of total nitrogen, ammonia nitrogen and COD, so that the effluent quality is effectively ensured, and A is improved2The average concentrations of the effluent ammonia nitrogen and the effluent COD of the/O and SNAD combined process are respectively 8.9mg/L and 35mg/L, the average removal rate of the effluent COD is 96%, the average removal rate of the effluent ammonia nitrogen is 95%, the average removal rate of the effluent total nitrogen is 91.1%, and the average removal rate of the effluent total phosphorus is 65.7%, wherein the removal effect of the ammonia nitrogen and the COD reaches the first-level industrial standard of the discharge Standard of pollutants for Water in meat processing (GB 13457-92).
While there have been shown and described what are at present considered to be the principles of the invention, its essential features and advantages, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Claims (2)

1. Slaughter and meat processing industry effluent treatment plant, its characterized in that includes and loops through improvement A that the pipeline links to each other2In a/O reactor and a SNAD autotrophic denitrification reactor, wherein A is improved2the/O reactor consists of a reaction tank and a sedimentation tank which are sequentially connected through a pipeline, the reaction tank is sequentially divided into an anaerobic zone, an anoxic zone, an aerobic zone I, an aerobic zone II and an intermittent aeration zone by a partition plate along the water inlet direction, through holes are respectively arranged at the upper part and the lower part of the adjacent partition plate and are used for realizing the baffling effect of wastewater in each reaction zone of the reaction tank, the aerobic zone II is communicated with the anoxic zone through a mixed liquid reflux peristaltic pump and a pipeline to realize the reflux of the mixed liquid, the intermittent aeration zone is communicated with the anaerobic zone through a sludge reflux peristaltic pump and a pipeline to realize the reflux of sludge, stirring devices are respectively arranged in the anaerobic zone and the anoxic zone, microporous aeration devices are respectively arranged in the aerobic zone I, the aerobic zone II and the intermittent aeration zone, the microporous aeration devices are respectively connected with an air pump through a pipeline and a flowmeter, a timing control valve is arranged on an air inlet pipeline of the microporous aeration devices in the intermittent aeration zone, the aeration quantity is controlled by an air pump and a flowmeter during the operation period to enable the activated sludge to be in a suspension state, the aeration state is controlled by a timing control valve in an intermittent aeration zone, and a sludge discharge port and a residual sludge discharge port are respectively arranged at the intermittent aeration zone and the bottom of the sedimentation tank; improvement A2An overflow water outlet of a sedimentation tank in an/O reactor is connected with a water inlet of an SNAD autotrophic nitrogen removal reactor through a pipeline, the inside of the SNAD autotrophic nitrogen removal reactor is divided into six baffle plate reaction tanks which are connected in series by partition plates along the water inlet direction, the adjacent baffle plate reaction tanks are communicated through an overflow weir, each baffle plate reaction tank is divided into two cells with the volume ratio of 3:1 and communicated bottom by baffle plates, wherein hydroformylation silk fiber filler bound by hollow plastic circular rings is suspended and filled in the large cell, heating rods and a microporous aeration device are arranged in the first three small cells, after raw water enters the SNAD autotrophic nitrogen removal reactor, the water flows downwards in the small cells and flows upwards in the large cell to achieve the full uniform mixing contact of muddy water, and the reaction is carried outThe gas produced in the process escapes from the top of the SNAD autotrophic denitrification reactor.
2. An operating method of the wastewater treatment plant in the slaughtering and meat processing industry according to claim 1, characterized by comprising the following specific steps:
step S1: starting of short-cut nitrification and denitrification process
Taking the effluent of a secondary hydrolysis acidification pool of a slaughter and meat processing mixed wastewater sewage plant as the raw water of inlet water, wherein the concentration of ammonia nitrogen in the inlet water is 160mg/L, the concentration of nitrite in the inlet water is less than 1mg/L, the concentration of nitrate in the inlet water is less than 2mg/L, the pH value of the inlet water is 6.8-7.5, the inlet water temperature is 19-20 ℃, and the improvement A is implemented2Activated sludge in an SBR pool is inoculated in an/O bioreactor, the sludge concentration is 4000MLSS/L, the dissolved oxygen amount of an aerobic zone I and an aerobic zone II of a reaction pool are controlled to be 1.0mg/L, the temperature of the reaction pool is controlled by a heating rod, during the test operation, the temperature of an anaerobic zone of the reaction pool is 20 ℃, the temperature of an anoxic zone of the reaction pool is 23 ℃, the temperatures of an aerobic zone I and an aerobic zone II of the reaction pool are 23 ℃, the sludge reflux ratio in a sedimentation pool is 90%, the reflux ratio of mixed liquid in the aerobic zone II of the reaction pool is 240%, the hydraulic retention time is 8h, the sludge age is 5d, the sludge discharge amount is 4.5L/d, the mixed liquid in the sedimentation pool and the aerobic zone II of the reaction pool are continuously cultured by a peristaltic pump to the anaerobic zone and the anoxic zone respectively, the water quality is changed at the later stage of start, the average ammonia nitrogen concentration of inlet water reaches 190mg/L, the COD load of inlet water increases to 1000mg/L, the sludge denitrification of the intermittent aeration zone and the sedimentation tank of the reaction tank is serious, the process operation parameters are adjusted, the dissolved oxygen quantity of the aerobic zone I and the aerobic zone II of the reaction tank are controlled to be 2mg/L, activated sludge is supplemented to the anaerobic zone of the reaction tank, after 20 days of continuous culture, the short-cut nitrification is successfully started, then the hydraulic retention time is adjusted to 10h, the improvement A is that2the/O bioreactor stably runs, the average concentration of nitrite nitrogen in effluent is 20mg/L, the average concentration of ammonia nitrogen in effluent is lower than 50mg/L, the average concentration of COD in effluent is 190mg/L, and the removal of COD and ammonia nitrogen in the biological denitrification process is mainly because the microorganism growth needs, the low dissolved oxygen is controlled during the running period, so that the energy consumption of the reactor is greatly reduced, and simultaneously, favorable conditions are created for the subsequent autotrophic denitrification;
step S2: starting denitrifying phosphorus removal process
Under the conditions that the COD concentration of inlet water is 1000mg/L, the ammonia nitrogen concentration of inlet water is 190mg/L, the total phosphorus concentration of inlet water is 28-32mg/L, the shortcut nitrification is successfully started and stably operated, the inlet water flow is controlled to be 7.0L/h, the sludge age is controlled to be 15d by reducing the sludge discharge to 1.5L/d, the hydraulic retention time is 10h, the dissolved oxygen content of an aerobic zone I and an aerobic zone II of a reaction tank is reduced to 1.0-1.5mg/L, the reflux ratio of mixed liquid in the aerobic zone II of the reaction tank is controlled to be 300%, denitrifying phosphorus accumulating bacteria are successfully enriched after 20 days of continuous culture, the denitrifying phosphorus removal process achieves stable operation, the phosphorus absorption amount of an anoxic zone of the reaction tank is up to 20.5mg/L, the phosphorus absorption removal rate is up to 64%, part of phosphorus is absorbed by aerobic bacteria, and the total phosphorus concentration of outlet water is about 8.9mg/L, the biological phosphorus removal reactor is successfully started;
step S3: start-up of autotrophic nitrogen removal process
The ammonia nitrogen concentration of the inlet water is kept at 50mg/L, the COD concentration of the inlet water is kept at 50mg/L, the pH value of the whole reaction is controlled at 7.5-8.0, the temperature is 30 ℃, and the method is specifically divided into two stages: the first stage is the starting of CANON, and the specific operation is as follows: inoculating anaerobic ammonium oxidation sludge into a baffle plate reaction tank, performing biofilm culturing on a biological membrane, and artificially distributing water for experiment inflow, wherein the components are as follows: tap water, industrial ammonium chloride, ammonium nitrite and sodium bicarbonate, wherein the inlet water quality keeps the concentration ratio of ammonia nitrogen to nitrite at 1:1, the hydraulic retention time is 10h, the continuous culture is carried out for 20 days, the reactor operates stably, the outlet water ammonia nitrogen concentration is less than 4mg/L, the average outlet water ammonia nitrogen removal rate is 91%, the total outlet water nitrogen removal rate reaches more than 81%, when the total outlet water nitrogen removal rate reaches more than 80% continuously for 7d, the biomembrane in the autotrophic denitrification reactor is basically stable, the anaerobic ammonia oxidation biomembrane in the baffled plate reaction tank is successfully cultured preliminarily, then the feeding of nitrite into the reactor is stopped, meanwhile, the aeration is carried out on the first three cells of the baffled plate reaction tank, the aeration mode is that the aeration is gradually reduced along the water flow direction, the aeration quantity is controlled to be 0.4L/min, 0.3L/min and 0.2L/min in sequence, and the acclimation is carried out for 90 days, the ammonia nitrogen concentration of the effluent and the total nitrogen concentration of the effluent are respectively 1.9mg/L and 12.0mg/L, the average removal rates of the effluent ammonia nitrogen and the effluent total nitrogen are respectively 94.5 percent and 75 percent, and the removal load of the reactor nitrogen reaches 0.21kg/m3D, when the total nitrogen removal rate of the effluent reaches more than 75% after 10 consecutive days, considering that the CANON start is successful; the second stage is the start of SNAD, the SNAD is realized in one reactor, the simulation improvement of raw water A2In order to ensure the stability of the quality of inlet water, the outlet water quality of the/O short-range nitrification and denitrification dephosphorization reactor is diluted by domestic sewage, industrial ammonium chloride, sodium nitrite and sodium bicarbonate are added into the domestic sewage according to a specific proportion, the aeration amount of the cells of the four baffle plate reaction tanks in the starting stage is controlled to be 0.35L/min, 0.3L/min, 0.15L/min and 0.1L/min in sequence, the HRT is 6h, the test is continuously carried out for 130 days, the SNAD reactor is successfully started, finally after the outlet water is stable, the average concentrations of outlet ammonia nitrogen, outlet total nitrogen and outlet COD are respectively 2mg/L, 6mg/L and 15mg/L, and the average removal rates of the outlet ammonia nitrogen, the outlet total nitrogen and the outlet COD are respectively 95%, 85% and 70%;
step S4: combination of short-cut nitrification and denitrification process and autotrophic nitrogen removal process
The experiment uses the effluent of the comprehensive adjusting tank of the industrial wastewater of slaughtering and meat processing as raw water, a hydrolysis acidification tank and an oil separation tank are arranged in front of the comprehensive adjusting tank, the water and oil separation of the oil separation tank and the hydrolysis of the hydrolysis acidification tank buffer the fluctuation of the incoming water, and further realize the relatively stable quality of the inlet water of the reactor, thereby ensuring the improvement of A2The stable operation of the/O and SNAD combined process has the influent ammonia nitrogen concentration of about 190mg/L, the influent nitrite concentration of less than 1mg/L, the influent total phosphorus concentration of 28-32mg/L, the influent COD concentration of 1000mg/L, the influent pH of about 7.0, the influent temperature of 23 ℃, and the improvement of A2the/O short-cut nitrification and denitrification dephosphorization reactor plays a main role in the denitrification and COD removal process of sewage treatment, and the SNAD reactor plays a role in strengthening removal of total nitrogen, ammonia nitrogen and COD, so that the effluent quality is effectively ensured, and A is improved2The average concentrations of the effluent ammonia nitrogen and the effluent COD of the/O and SNAD combined process are respectively 8.9mg/L and 35mg/L, the average removal rate of the effluent COD is 96 percent, the average removal rate of the effluent ammonia nitrogen is 95 percent, and the effluent isThe average removal rate of total nitrogen is 91.1%, and the average removal rate of total phosphorus in effluent is 65.7%.
CN202111469056.8A 2021-12-03 2021-12-03 Slaughtering and meat processing industrial wastewater treatment device and operation method thereof Pending CN114084950A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114933401A (en) * 2022-06-07 2022-08-23 中车环境科技有限公司 Municipal sludge reduction coupling autotrophic nitrogen removal treatment system
CN115161235A (en) * 2022-07-08 2022-10-11 山东美泉环保科技有限公司 Culture method and culture device of anaerobic ammonium oxidation bacteria and application of anaerobic ammonium oxidation bacteria in treatment of industrial wastewater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114933401A (en) * 2022-06-07 2022-08-23 中车环境科技有限公司 Municipal sludge reduction coupling autotrophic nitrogen removal treatment system
CN114933401B (en) * 2022-06-07 2024-03-01 中车环境科技有限公司 Urban sludge decrement coupling autotrophic nitrogen removal treatment system
CN115161235A (en) * 2022-07-08 2022-10-11 山东美泉环保科技有限公司 Culture method and culture device of anaerobic ammonium oxidation bacteria and application of anaerobic ammonium oxidation bacteria in treatment of industrial wastewater

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