CN215517067U - Corn starch effluent disposal system - Google Patents
Corn starch effluent disposal system Download PDFInfo
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- CN215517067U CN215517067U CN202023336262.5U CN202023336262U CN215517067U CN 215517067 U CN215517067 U CN 215517067U CN 202023336262 U CN202023336262 U CN 202023336262U CN 215517067 U CN215517067 U CN 215517067U
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Abstract
The utility model provides a corn starch wastewater treatment system, and belongs to the technical field of sewage treatment. The treatment system comprises a comprehensive adjusting tank, a distribution tank, an IC anaerobic tower, an anoxic tank, an A/O aerobic tank, a secondary sedimentation tank, a chemical phosphorus removal reaction tank and a magnetic flocculation reaction tank which are sequentially communicated, wherein the comprehensive adjusting tank is used for homogenizing and homogenizing the corn starch wastewater, and the distribution tank is used for adjusting the temperature and the pH value of the wastewater; removing organic matters and nitrogen pollutants in the wastewater in an IC anaerobic tower and an anoxic tank; the utility model utilizes the chemical phosphorus removal reaction tank to carry out chemical phosphorus removal, and utilizes the magnetic flocculation reaction tank to carry out magnetic flocculation on phosphorus and residual organic matters in the wastewaterRemoving to ensure that the final effluent reaches COD less than or equal to 60mg/L and NH3N is less than or equal to 15mg/L, TN is less than or equal to 30mg/L, and TP is less than or equal to 1.0mg/L, so that the effluent meets the recycling requirements of enterprises.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to a corn starch wastewater treatment system.
Background
Starch is one of the important industries of national economy, corn is one of three major food crops in China, the starch yield of the corn accounts for about 92 percent of the total starch yield in China, and the corn deep processing industry is also known as the 'gold' industry. By continuously adjusting the configuration, introducing advanced equipment andthe technology obviously improves the corn starch and the deep processing level thereof, along with the improvement of the production level, the water consumption per ton of the starch is greatly reduced, but the COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus) and NH (NH) in the wastewater are increased due to the increase of the circulation times3The accumulation of-N (ammonia nitrogen) and BOD (biological oxygen demand) is serious, and the water consumption of the starch production workshop is unbalanced, so that the quality of the discharged water fluctuates greatly, and the pollution treatment is difficult.
The corn starch wastewater is mainly from raw material soaking liquid, washing water, equipment washing water and the like in production. The main components of the fertilizer are organic substances such as starch, sugar, protein and cellulose, and inorganic substances containing nitrogen and carbon. The method mainly has the following characteristics: (1) the waste water yield is large, the COD and BOD concentrations are high, and the organic matters are rich; (2) contains a large amount of N, P nutrients, has high content of suspended matters and colloidal protein, and belongs to high-concentration organic wastewater with good biochemical property. At present, the treatment process of the corn starch wastewater mainly adopts an anaerobic/aerobic combined treatment process, more process types are UASB/SBR, UASB/A/O, A/O and the like, and the processes can effectively remove COD (chemical oxygen demand) in the wastewater in actual engineering, but the high-efficiency removal of nitrogen and phosphorus is difficult to realize.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a corn starch wastewater treatment system. The treatment system provided by the utility model can effectively remove organic matters, nitrogen and phosphorus pollutants in the corn starch wastewater.
In order to achieve the purpose of the utility model, the utility model provides the following technical scheme:
the utility model provides a corn starch wastewater treatment system, which comprises a comprehensive adjusting tank, wherein a first aeration device is arranged in the comprehensive adjusting tank;
the inlet of the distribution tank is communicated with the outlet of the comprehensive adjusting tank, the distribution tank is communicated with a heating device and a first dosing device, and the first dosing device is used for adding a pH value adjusting agent into the distribution tank;
the inlet of the IC anaerobic tower is communicated with the outlet of the distribution tank, and the IC anaerobic tower contains activated sludge;
the inlet of the anoxic tank is communicated with the outlet of the IC anaerobic tower, the anoxic tank is provided with a first sludge outlet and a first water outlet, and the first sludge outlet is communicated with the inlet of the IC anaerobic tower; the anoxic tank contains activated sludge;
the inlet of the anoxic zone is communicated with the first water outlet of the anoxic tank; the anoxic zone is provided with a second aeration device, and the aerobic zone is provided with a third aeration device; the anoxic zone and the aerobic zone contain activated sludge;
the inlet of the secondary sedimentation tank is communicated with the aerobic zone outlet of the A/O aerobic tank, the secondary sedimentation tank is provided with a second sludge outlet and a second water outlet, and the second sludge outlet is communicated with the sludge inlet of the A/O aerobic tank and the sludge inlet of the anoxic tank;
the inlet of the chemical phosphorus removal reaction tank is communicated with the water outlet of the secondary sedimentation tank, the chemical phosphorus removal reaction tank is communicated with a second medicine adding device, and the second medicine adding device is used for adding an alkaline agent and a phosphorus removing agent into the chemical phosphorus removal reaction tank;
the inlet of the magnetic flocculation reaction tank is communicated with the outlet of the chemical phosphorus removal reaction tank, the magnetic flocculation reaction tank is communicated with a third dosing device, and the third dosing device is used for adding magnetic seeds, a coagulant and a flocculant into the magnetic flocculation reaction tank;
the inlet is with the magnetism flocculation and precipitation pond of magnetism flocculation and reaction pond export intercommunication, magnetism flocculation and precipitation pond is equipped with third mud export and clear water export.
Preferably, a double-layer three-phase separator is arranged in the IC anaerobic tower.
Preferably, the secondary sedimentation tank is a radial flow sedimentation tank.
Preferably, the magnetic flocculation sedimentation tank is a radial flow sedimentation tank.
Preferably, the corn starch wastewater treatment system provided by the utility model further comprises:
the sludge tank is communicated with a sludge outlet of the secondary sedimentation tank and a sludge outlet of the magnetic flocculation sedimentation tank, and is provided with a fourth aeration device;
the inlet is communicated with the sludge dewatering device of the sludge pool outlet, the sludge dewatering device is provided with a concentrated sludge outlet and a water outlet, and the water outlet is communicated with the water inlets of the sludge pool and the comprehensive adjusting tank.
Preferably, the corn starch wastewater treatment system provided by the utility model further comprises a clean water tank with an inlet communicated with the clean water outlet of the magnetic flocculation sedimentation tank.
The utility model provides a corn starch wastewater treatment system, which comprises a comprehensive adjusting tank, a distribution tank, an IC anaerobic tower, an anoxic tank, an A/O aerobic tank, a secondary sedimentation tank, a chemical phosphorus removal reaction tank and a magnetic flocculation reaction tank which are sequentially communicated, wherein the comprehensive adjusting tank is used for homogenizing corn starch wastewater, and the distribution tank is used for adjusting the temperature and the pH value of the wastewater; in an IC anaerobic tower and an anoxic tank, anaerobic bacteria in the activated sludge hydrolyze suspended matters and soluble organic matters into organic acid, decompose macromolecular organic matters into micromolecular organic matters, convert insoluble organic matters into soluble organic matters, and facilitate subsequent A/O aerobic treatment; in the anoxic zone of the A/O aerobic tank, heterotrophic bacteria in the activated sludge ammonify amino groups in organic pollutants in the wastewater to free NH4 +(ii) a In the aerobic zone of the A/O aerobic tank, the autotrophic bacteria in the sludge convert NH4 +Oxidation to NO3 -The obtained nitrifying liquid flows back to an anoxic zone, and NO is generated by the denitrification of the heterotrophic bacteria in the activated sludge under the anoxic condition3 -Reduced to molecular nitrogen (N)2) The starch wastewater is treated in a harmless and standard-reaching way; the utility model uses the secondary sedimentation tank to carry out sedimentation on the sludge in the wastewater, and separates the sludge in the wastewater; the utility model utilizes the chemical phosphorus removal reaction tank to carry out chemical phosphorus removal, and utilizes the magnetic flocculation reaction tank to further remove phosphorus and residual organic matters in the wastewater in a magnetic flocculation way, so that the COD of the final effluent is less than or equal to 60mg/L, and NH is3N is less than or equal to 15mg/L, TN is less than or equal to 30mg/L, and TP is less than or equal to 1.0mg/L, so that the effluent meets the recycling requirements of enterprises.
Furthermore, the corn starch wastewater treatment system provided by the utility model also comprises a sludge tank and a sludge dewatering device, and the sludge produced by the secondary sedimentation tank and the magnetic flocculation sedimentation tank is treated by the sludge tank and the sludge dewatering device, so that the sludge can be reasonably utilized, the sludge yield is low, and the treatment cost is low.
Drawings
FIG. 1 is a schematic view of a corn starch wastewater treatment system of the present invention.
Detailed Description
The utility model provides a corn starch wastewater treatment system, wherein an inlet of a distribution tank is communicated with an outlet of a comprehensive regulating tank, the distribution tank is communicated with a heating device and a first dosing device, and the first dosing device is used for adding a pH value regulator into the distribution tank;
the inlet of the IC anaerobic tower is communicated with the outlet of the distribution tank, and the IC anaerobic tower contains activated sludge;
the inlet of the anoxic tank is communicated with the outlet of the IC anaerobic tower, the anoxic tank is provided with a first sludge outlet and a first water outlet, and the first sludge outlet is communicated with the inlet of the IC anaerobic tower; the anoxic tank contains activated sludge;
the inlet of the anoxic zone is communicated with the first water outlet of the anoxic tank; the anoxic zone is provided with a second aeration device, and the aerobic zone is provided with a third aeration device; the anoxic zone and the aerobic zone contain activated sludge;
the inlet of the secondary sedimentation tank is communicated with the aerobic zone outlet of the A/O aerobic tank, the secondary sedimentation tank is provided with a second sludge outlet and a second water outlet, and the second sludge outlet is communicated with the sludge inlet of the A/O aerobic tank and the sludge inlet of the anoxic tank;
the inlet of the chemical phosphorus removal reaction tank is communicated with the water outlet of the secondary sedimentation tank, the chemical phosphorus removal reaction tank is communicated with a second medicine adding device, and the second medicine adding device is used for adding an alkaline agent and a phosphorus removing agent into the chemical phosphorus removal reaction tank;
the inlet of the magnetic flocculation reaction tank is communicated with the outlet of the chemical phosphorus removal reaction tank, the magnetic flocculation reaction tank is communicated with a third dosing device, and the third dosing device is used for adding magnetic seeds, a coagulant and a flocculant into the magnetic flocculation reaction tank;
the inlet is with the magnetism flocculation and precipitation pond of magnetism flocculation and reaction pond export intercommunication, magnetism flocculation and precipitation pond is equipped with third mud export and clear water export.
The corn starch wastewater treatment system provided by the utility model comprises a comprehensive adjusting tank, wherein a first aeration device is arranged in the comprehensive adjusting tank. The utility model has no special requirements on the size and specification of the comprehensive adjusting tank, and can be designed correspondingly according to the actual processing condition. The present invention does not require any particular kind of first aeration device, and aeration devices known to those skilled in the art may be used. In the present invention, the first aeration apparatus is preferably disposed at the bottom of the integrated equalizing basin. In the utility model, the comprehensive adjusting tank plays a role in homogenizing and homogenizing the corn starch wastewater.
The corn starch wastewater treatment system provided by the utility model comprises a distribution tank with an inlet communicated with an outlet of the comprehensive regulating tank, wherein the distribution tank is communicated with a heating device and a first dosing device, and the first dosing device is used for adding a pH value regulator into the distribution tank. The utility model has no special requirements on the size and specification of the distribution pool, and can be designed correspondingly according to the actual processing condition. In the present invention, the heating means is preferably a steam heating means; the present invention does not require any particular kind of first dosing device, and may be implemented using dosing devices known to those skilled in the art. The heating device and the first dosing device are not required to be arranged at special positions, and the heating and dosing requirements can be met. In the present invention, the pH regulator is preferably NaHCO3The concentration of the NaOH solution is preferably 30-45 wt%, and more preferably 35-40 wt%. In the utility model, a pH meter is also preferably arranged in the distribution tank to monitor the pH value of the corn starch wastewater.
The corn starch wastewater treatment system provided by the utility model comprises an IC anaerobic tower, wherein an inlet of the IC anaerobic tower is communicated with an outlet of the distribution tank; the IC anaerobic tower contains activated sludge. The IC anaerobic tower is not particularly required by the utility model, and the IC anaerobic tower which is well known to the technical personnel in the field can be used. In the utility model, the activated sludge is preferably activated sludge of a sludge concentration tank of a municipal sewage treatment plant, and the concentration of the activated sludge is preferably 0.5-1.2 g/L, more preferably 0.8-1 g/L; the water content of the activated sludge is preferably 75-80%, and more preferably 76-78%. In the utility model, the IC anaerobic tower can carry out anaerobic digestion on pollutants in the wastewater, and organic matters in the wastewater are decomposed, metabolized and digested by anaerobic bacteria in an anaerobic state, so that the content of the organic matters in the wastewater is greatly reduced. In the utility model, the IC anaerobic tower is preferably internally provided with a double-layer three-phase separator. The double-layer three-phase separator can separate the methane generated in the anaerobic digestion process.
The corn starch wastewater treatment system provided by the utility model comprises an anoxic tank, wherein the inlet of the anoxic tank is communicated with the outlet of the IC anaerobic tower, the anoxic tank is provided with a first sludge outlet and a first water outlet, and the first sludge outlet is communicated with the inlet of the IC anaerobic tower; the anoxic tank contains activated sludge. The utility model has no special requirements on the size and specification of the anoxic pond, and can be designed correspondingly according to the actual treatment condition. In the utility model, the activated sludge is preferably activated sludge of a sludge concentration tank of a municipal sewage treatment plant, and the concentration of the activated sludge is preferably 0.5-1.2 g/L, more preferably 0.8-1 g/L; the water content of the activated sludge is preferably 75-80%, and more preferably 76-78%. In the utility model, a submersible stirrer is preferably arranged in the anoxic pond, so that the wastewater and the sludge are fully mixed. The first sludge outlet is communicated with the inlet of the IC anaerobic tower, so that the sludge in the anoxic tank can flow back to the IC anaerobic tower to maintain the concentration of the sludge in the anaerobic tower.
The utility model utilizes the IC anaerobic tower and the anoxic tank to hydrolyze suspended matters and soluble organic matters in the corn starch wastewater into organic acid, macromolecular organic matters are decomposed into micromolecular organic matters, and insoluble organic matters are converted into soluble organic matters, thereby facilitating the subsequent A/O aerobic treatment.
The corn starch wastewater treatment system provided by the utility model comprises an A/O aerobic tank, wherein an inlet of the A/O aerobic tank is communicated with a first water outlet of the anoxic tank, and the A/O aerobic tank comprises an anoxic zone and an aerobic zone which are communicated with each other; the anoxic zone is provided with a second aeration device, and the aerobic zone is provided with a third aeration device; the anoxic zone and the aerobic zone contain activated sludge. The utility model has no special requirements on the A/O aerobic tank, and the A/O aerobic tank which is well known to the technical personnel in the field can be used. The second aeration device and the third aeration device are not particularly required in the utility model, and aeration devices well known to those skilled in the art can be used. In the utility model, the activated sludge is preferably activated sludge of a sludge concentration tank of a municipal sewage treatment plant, and the concentration of the activated sludge is preferably 0.5-1.2 g/L, more preferably 0.8-1 g/L; the water content of the activated sludge is preferably 75-80%, and more preferably 76-78%. In the utility model, in the anoxic zone of the A/O aerobic tank, heterotrophic bacteria in the activated sludge ammonify the residual organic pollutants in the wastewater to free NH4 +(ii) a In the aerobic zone, the autotrophic bacteria in the activated sludge will convert NH4 +Conversion to oxidation to NO3 -When the obtained nitrifying liquid flows back to the anoxic zone, NO is generated by the denitrification of the heterotrophic bacteria in the sludge under the anoxic condition3 -Reduced to molecular nitrogen (N)2) And the starch wastewater is treated in a harmless and standard-reaching way.
The corn starch wastewater treatment system provided by the utility model comprises a secondary sedimentation tank, wherein an inlet of the secondary sedimentation tank is communicated with an aerobic zone outlet of the A/O aerobic tank, the secondary sedimentation tank is provided with a second sludge outlet and a second water outlet, and the second sludge outlet is communicated with the inlet of the A/O aerobic tank and the inlet of the anoxic tank. In the utility model, the secondary sedimentation tank is preferably a radial flow sedimentation tank.
The corn starch wastewater treatment system provided by the utility model comprises a chemical phosphorus removal reaction tank, wherein an inlet of the chemical phosphorus removal reaction tank is communicated with a water outlet of a secondary sedimentation tank, the chemical phosphorus removal reaction tank is communicated with a second medicine adding device, and the second medicine adding device is used for adding an alkaline agent and a phosphorus removing agent into the chemical phosphorus removal reaction tank. The utility model has no special requirements on the specific size and specification of the chemical phosphorus removal reaction tank, and can be designed correspondingly according to the actual treatment condition. The present invention does not require a particular kind of second applicator, and may be implemented using applicators well known to those skilled in the art. In the present invention, the alkaline agent is preferably sodium hydroxide; the phosphorus removing agent is preferably an SPT-P5 inorganic phosphorus removing agent, and the content of active ingredients in the phosphorus removing agent is preferably more than or equal to 95%. According to the utility model, the chemical phosphorus removal reaction tank can remove phosphorus in wastewater.
The corn starch wastewater treatment system provided by the utility model comprises a magnetic flocculation reaction tank, wherein an inlet of the magnetic flocculation reaction tank is communicated with an outlet of the chemical phosphorus removal reaction tank, the magnetic flocculation reaction tank is communicated with a third dosing device, and the third dosing device is used for adding magnetic seeds, a coagulant and a flocculant into the magnetic flocculation reaction tank. The utility model has no special requirements on the specific size and specification of the magnetic flocculation reaction tank, and can be designed correspondingly according to the actual treatment condition. The present invention does not require any particular kind of third drug delivery device, and any drug delivery device known to those skilled in the art may be used. In the utility model, the magnetic seeds are preferably magnetic powder with the particle size of 50-80 meshes; the coagulant is preferably polyacrylamide; the flocculant is preferably polyaluminium chloride. The utility model can remove residual phosphorus and organic matters in the wastewater through the magnetic flocculation reaction tank.
The corn starch wastewater treatment system provided by the utility model comprises a magnetic flocculation sedimentation tank, wherein the inlet of the magnetic flocculation sedimentation tank is communicated with the outlet of the magnetic flocculation reaction tank, and the magnetic flocculation sedimentation tank is provided with a third sludge outlet and a clear water outlet. In the utility model, the magnetic flocculation sedimentation tank is preferably a radial flow sedimentation tank. The utility model has no special requirements on the specific size and specification of the magnetic flocculation sedimentation tank, and can be designed correspondingly according to the actual treatment condition.
The corn starch wastewater treatment system provided by the utility model also preferably comprises a clean water tank with an inlet communicated with the clean water outlet of the magnetic flocculation sedimentation tank. The utility model has no special requirements on the specific size and specification of the clean water tank, and can be designed correspondingly according to the actual treatment condition. In the utility model, the clean water tank is used for temporarily storing the effluent of the magnetic flocculation sedimentation tank.
The corn starch wastewater treatment system provided by the utility model also preferably comprises a sludge tank with an inlet communicated with the sludge outlet of the secondary sedimentation tank and the sludge outlet of the magnetic flocculation sedimentation tank, and the sludge tank is provided with a fourth aeration device. The utility model has no special requirements on the specific size and specification of the sludge tank, and can be designed correspondingly according to the actual treatment condition. The fourth aeration device is not particularly required in the present invention, and an aeration device known to those skilled in the art may be used.
The corn starch wastewater treatment system provided by the utility model also preferably comprises a sludge dewatering device with an inlet communicated with the outlet of the sludge tank, wherein the sludge dewatering device is provided with a concentrated sludge outlet and a water outlet, and the water outlet is communicated with the inlets of the sludge tank and the comprehensive adjusting tank. In the present invention, the sludge dewatering device is preferably a plate and frame filter press.
The corn starch wastewater treatment system provided by the utility model also preferably comprises a pump; the corn starch wastewater treatment system preferably comprises three pumps, wherein the first pump is preferably positioned at a pipeline connecting an outlet of the comprehensive adjusting tank and an inlet of the distribution tank, the second pump is preferably positioned at a pipeline connecting an outlet of the distribution tank and an inlet of the IC anaerobic tower, and the third pump is preferably positioned at a pipeline connecting an outlet of the sludge tank and an inlet of the sludge dewatering device. In the present invention, the pump is preferably a stainless steel delivery pump. The utility model realizes the smooth circulation of the wastewater and the sludge through the pump.
The schematic diagram of the high-COD lead-zinc industrial mineral processing wastewater treatment system is shown in figure 1.
The method for treating the corn starch based on the corn starch wastewater treatment system comprises the following steps:
(1) aerating the corn starch wastewater in a comprehensive adjusting tank to obtain effluent of the comprehensive adjusting tank;
(2) the water discharged from the comprehensive adjusting tank enters a distribution tank, is mixed with a pH value adjusting agent added by a first dosing device under the heating condition, and is adjusted to be 7.5-8.5, so that the water discharged from the distribution tank is obtained;
(3) the outlet water of the distribution tank enters an IC anaerobic tower for anaerobic digestion to obtain the outlet water of the IC anaerobic tower;
(4) the effluent of the IC anaerobic tower enters an anoxic tank for first anoxic treatment to obtain anoxic tank effluent and first sludge, and part of the first sludge flows back to the IC anaerobic tower;
(5) the effluent of the anoxic tank enters an A/O aerobic tank, and the anoxic zone and the aerobic zone are circularly subjected to second anoxic treatment and aerobic treatment under the aeration condition to obtain the effluent of the A/O aerobic tank;
(6) the effluent of the A/O aerobic tank enters a secondary sedimentation tank for sedimentation to obtain effluent of the secondary sedimentation tank and second sludge, wherein one part of the second sludge flows back to the anoxic tank, and the other part of the second sludge flows back to the A/O aerobic tank;
(7) the effluent of the secondary sedimentation tank enters a chemical phosphorus removal reaction tank, and is mixed with an alkaline agent and a phosphorus removal agent added by a second dosing device for chemical phosphorus removal to obtain the effluent of the phosphorus removal reaction tank;
(8) the effluent of the dephosphorization reaction tank enters a magnetic flocculation reaction tank, and is mixed with magnetic seeds, a coagulant and a flocculant added by a third dosing device for magnetic flocculation reaction to obtain the effluent of the magnetic flocculation reaction tank;
(9) and the effluent of the magnetic flocculation reaction tank enters a magnetic flocculation sedimentation tank for sedimentation to obtain final effluent and third sludge.
In the utility model, the corn starch wastewater enters the comprehensive adjusting tank for aeration to obtain the effluent of the comprehensive adjusting tank. The method has no special requirements on the source and the type of the corn starch wastewater, and the corn starch wastewater produced by any corn starch manufacturing process is treated by the method provided by the utility model. In the utility model, the flow rate of the corn starch wastewater entering the comprehensive regulating tank is preferably 150m3H is used as the reference value. In the present invention, the aeration rate of the aeration is preferably 2 to 4m3/(m2H), more preferably 2.8m3/(m2·h)。
In the utility model, the effluent of the comprehensive adjusting tank enters a distribution tank, is mixed with a pH value regulator added by a first dosing device under the heating condition, and is adjusted to 7.5-8.5 to obtain the effluent of the distribution tank. In the present invention, the pH regulator is preferably NaHCO3A buffer solution or a NaOH solution, the concentration of the NaOH solution being preferably 30 wt%. In the present invention, the heating is preferably steam heating; in the utility model, the steam heating is steam mixing heating; the heating temperature is preferably 35-38 ℃, and more preferably 36-37 ℃.
In the utility model, the effluent of the distribution tank enters an IC anaerobic tower for anaerobic digestion to obtain the effluent of the IC anaerobic tower. In the utility model, the oxidation-reduction potential of the anaerobic digestion is preferably-500 to-400 mV, and more preferably-450 mV; the dissolved oxygen in the water during anaerobic digestion is preferably 0-0.2 mg/L, and more preferably 0.05-0.15 mg/L; in the utility model, the hydraulic retention time of the IC anaerobic tower is preferably 2-3 days.
In the utility model, the effluent of the IC anaerobic tower enters an anoxic tank for first anoxic treatment to obtain the effluent of the anoxic tank and first sludge, and part of the first sludge flows back to the IC anaerobic tower. In the utility model, the dissolved oxygen of the first anoxic treatment is preferably less than or equal to 0.2mg/L, and more preferably 0.05-0.15 mg/L; the carbon-nitrogen ratio in the water during the first anoxic treatment is preferably (4-5): 1, more preferably 4.5: 1. In the utility model, the time of the first anoxic treatment is preferably 12-24 h, and more preferably 18-20 h. In the present invention, the amount of the first sludge refluxed is preferably 150 to 300%, and more preferably 180 to 250%. In the present invention, the reflux amount is a reflux amount relative to a water inflow amount.
In the utility model, the effluent of the anoxic tank enters an A/O aerobic tank, and the anoxic zone and the aerobic zone are circularly subjected to second anoxic treatment and aerobic treatment under the aeration conditionAnd treating to obtain the effluent of the A/O aerobic tank. In the utility model, the dissolved oxygen in the water during the second anoxic treatment is preferably less than or equal to 0.2mg/L, and more preferably 0.05-0.15 mg/L; the aeration rate of the second anoxic treatment is preferably 0.5-1.0 m3/(m2H), more preferably 0.6 to 0.8m3/(m2H). In the present invention, the dissolved oxygen in the water during the aerobic treatment is preferably 3 to 5mg/L, more preferably 3.5 to 4.5mg/L, and the aeration rate of the aerobic treatment is preferably 5 to 6m3/(m2H), more preferably 5.5m3/(m2H). In the utility model, the hydraulic retention time of the A/O aerobic pool is preferably 3-5 days, and more preferably 3.5-4.5 days; the sludge sedimentation ratio of the A/O aerobic tank is preferably 70-80%, and more preferably 72-76%.
In the utility model, the effluent of the A/O aerobic tank enters a secondary sedimentation tank for sedimentation to obtain effluent of the secondary sedimentation tank and second sludge, wherein one part of the second sludge flows back to the anoxic tank, and the other part of the second sludge flows back to the A/O aerobic tank. In the utility model, when the secondary sedimentation tank is a radial flow sedimentation tank, the linear speed of the mud scraper in the radial flow sedimentation tank is preferably 2-3 m/min, and more preferably 2.5 m/min; the rotating speed of the mud scraper is preferably 1-3 r/h, and more preferably 2 r/h; the surface load of the secondary sedimentation tank is preferably 0.5-1.0 m3/m2H, more preferably 0.7m3/m2H. In the utility model, the reflux ratio of the second sludge to the anoxic pond is preferably 150-300%, and more preferably 180%; the reflux ratio of the reflux to the A/O aerobic tank is preferably 150-300%, and more preferably 280%. In the present invention, the reflux ratio is a reflux ratio with respect to a water inflow.
In the utility model, the effluent of the secondary sedimentation tank enters a chemical phosphorus removal reaction tank and is mixed with an alkaline agent and a phosphorus removal agent added by a second dosing device to obtain the effluent of the phosphorus removal reaction tank. In the present invention, the alkaline agent is preferably sodium hydroxide; after the alkaline agent is added, the pH value of the obtained mixed solution is preferably 9-10. In the utility model, the phosphorus removing agent is preferably an SPT-P5 inorganic phosphorus removing agent, the content of active ingredients in the phosphorus removing agent is preferably more than or equal to 95%, and the phosphorus removing agent is addedThe amount is preferably 0.05 to 0.10kg/m3More preferably 0.06 to 0.08kg/m3. In the utility model, the time for chemical phosphorus removal is preferably 15-25 min, and more preferably 18-20 min.
In the utility model, the effluent of the dephosphorization reaction tank enters a magnetic flocculation reaction tank, and is mixed with magnetic seeds, a coagulant and a flocculant added by a third dosing device for magnetic flocculation reaction to obtain the effluent of the magnetic flocculation reaction tank. In the utility model, the magnetic seeds are preferably magnetic powder with the particle size of 50-80 meshes; in the present invention, the coagulant is preferably polyacrylamide, and the molecular weight of the polyacrylamide is preferably 1200 ten thousand. The addition amount of the coagulant is preferably 0.008-0.012 kg/m3More preferably 0.009-0.01 kg/m3(ii) a In the utility model, the flocculating agent is preferably polyaluminium chloride, and the content of aluminum in the polyaluminium chloride is preferably more than or equal to 28%; the addition amount of the flocculating agent is 0.35-0.45 kg/m3More preferably 0.38 to 0.42kg/m3. In the utility model, the time of the magnetic flocculation reaction is 10-20 min, and more preferably 15 min.
In the utility model, the effluent of the magnetic flocculation reaction tank enters a magnetic flocculation sedimentation tank for sedimentation, so as to obtain final effluent and third sludge. In the utility model, when the magnetic flocculation sedimentation tank is a radial flow sedimentation tank, the linear speed of a mud scraper in the radial flow sedimentation tank is preferably 2-3 m/min, and more preferably 2.5 m/min; the rotating speed of the mud scraper is preferably 1-3 r/h, and more preferably 2 r/h; the surface load of the secondary sedimentation tank is preferably 0.5-1.0 m3/m2H, more preferably 0.8m3/m2H. The final effluent obtained by the utility model can be directly discharged or reused.
The corn starch wastewater treatment method provided by the utility model also preferably comprises the following steps: and the rest part of the second sludge and the third sludge enter a sludge tank for aeration stirring, the effluent of the sludge tank enters a sludge dehydration device for dehydration to obtain concentrated sludge and sludge dehydration product water, and the sludge dehydration product water enters a comprehensive adjusting tank. In the present invention, the aeration amount of the aeration stirring is preferably 2 to 4 (m)3/m2H). In the present invention, the dewatering is preferably performed by plate-and-frame pressure filtration. In the utility model, when plate-and-frame filter pressing is carried out, a cationic coagulant is preferably added into the sludge, the cationic coagulant is preferably cationic polyacrylamide, and the adding amount of the cationic coagulant is preferably 0.0002-0.0005 kg/m3More preferably 0.003 to 0.004kg/m3. The utility model adjusts the property of the sludge by adding the cationic coagulant, enlarges the flocs of the sludge particles and improves the dehydration performance of the sludge. In the utility model, the pressure of the plate-and-frame filter pressing is preferably 0.4-0.6 MPa, preferably 0.4MPa, and the time is preferably 4-8 h, and more preferably 6 h. In the utility model, the water content of the concentrated sludge is preferably 70-80%, and the concentrated sludge can be discharged after being treated as common solid waste.
The corn starch wastewater treatment system provided by the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The water quality of the corn starch wastewater of a certain factory treated by the treatment system is shown in the following table 1:
TABLE 1 corn starch wastewater quality (unit: mg/L)
| Index of water quality | COD | NH3-N | TN | TP | BOD5 |
| Content (wt.) | 5500 | 150 | 200 | 100 | 2800 |
The processing method comprises the following steps:
(1) the corn starch wastewater enters a comprehensive adjusting tank for aeration, and the aeration rate is 2.8m3/(m2H) obtaining the effluent of the comprehensive adjusting tank;
(2) the effluent of the comprehensive regulating reservoir enters a distribution reservoir and is added with NaHCO added by a first dosing device3Mixing the buffer solutions, adjusting the pH value to 7.5, and heating the mixture to 38 ℃ by steam to obtain water discharged from a water distribution tank;
(3) enabling the outlet water of the distribution tank to enter an IC anaerobic tower, controlling the oxidation-reduction potential of the anaerobic tower to be-500 mv and the dissolved oxygen to be 0.2mg/L, and carrying out anaerobic digestion for 2.5 days to obtain the outlet water of the IC anaerobic tower;
(4) the effluent of the IC anaerobic tower enters an anoxic tank for first anoxic treatment, the dissolved oxygen in the water is 0.2mg/L during the first anoxic treatment, and the carbon-nitrogen ratio is 4: 1, obtaining effluent of an anoxic pond and first sludge, wherein the first sludge flows back to an IC anaerobic tower according to 220%;
(5) the effluent of the anoxic tank enters an A/O aerobic tank for hydraulic retention for 4 days, and a second anoxic treatment and an aerobic treatment are circularly performed in the anoxic zone and the aerobic zone, wherein the dissolved oxygen of the second anoxic treatment is 0.2mg/L, and the aeration rate is 0.5m3/(m2H), dissolved oxygen of 3mg/L and aeration amount of 6m in aerobic treatment3/(m2H), refluxing 360 percent of water in the aerobic zone to the anoxic zone to obtain effluent of the A/O aerobic tank, wherein the sludge sedimentation ratio of the A/O aerobic tank is 80 percent;
(6) the effluent of the A/O aerobic tank enters a secondary sedimentation tank for sedimentation to obtain effluent of the secondary sedimentation tank and second sludge, wherein the second sludge flows back to the anoxic tank according to the reflux ratio of 180 percent and flows back to the A/O aerobic tank according to the reflux ratio of 280 percent;
(7) the effluent of the secondary sedimentation tank enters a chemical dephosphorization reaction tank, NaOH is added through a second dosing device until the pH value of the liquid is 9, and 0.05kg/m of NaOH is added at the same time3The phosphorus removing agent SPT-P5 to obtain the effluent of the phosphorus removing reaction tank;
(8) the water discharged from the dephosphorization reaction tank enters a magnetic flocculation reaction tank, and magnetic powder with the particle size of 50 meshes and 0.008kg/m are added through a third dosing device3Polyacrylamide coagulant and 0.35kg/m3Polymerizing an aluminum chloride flocculating agent to obtain the effluent of the magnetic flocculation reaction tank;
(9) the effluent of the magnetic flocculation reaction tank enters a magnetic flocculation sedimentation tank for sedimentation to obtain final effluent and third sludge, wherein the sedimentation tank is a radial sedimentation tank, the linear speed of a mud scraper in the sedimentation tank is 2m/min, the rotating speed is 1r/h, and the surface load of the sedimentation tank is 0.8m3/m2·h；
(10) The rest part of the second sludge and the third sludge enter a sludge tank for aeration and stirring, and the effluent of the sludge tank enters a sludge dewatering device and is mixed with 0.0005kg/m3And (3) mixing the cationic flocculant and then performing plate-frame filter pressing to obtain concentrated sludge with the water content of 70% and sludge dehydration produced water, wherein the sludge dehydration produced water enters a comprehensive regulating tank, and the concentrated sludge is further treated as solid waste.
The water quality was monitored in the above steps and the results are reported in table 2.
TABLE 2 Water quality of effluent at each stage (unit: mg/L)
As can be seen from Table 2, the combined treatment method of the IC anaerobic tower, the anoxic tank, the A/O aerobic tank, the chemical phosphorus removal and the magnetic flocculation, provided by the utility model, can effectively remove organic matters, nitrogen and phosphorus pollution in the corn starch wastewater, and each index of the obtained final produced water meets the requirement of the enterprise recycling standard (the enterprise recycling standard is that COD is less than or equal to 60mg/L, BOD5≤60mg/L，NH3-N≤15mg/L，TN≤30mg/L，TP≤1mg/L)。
Example 2
The water quality of the corn starch wastewater of a certain factory treated by the treatment system is shown in the following table 3:
TABLE 3 corn starch wastewater quality (unit: mg/L)
| Index of water quality | COD | NH3-N | TN | TP | BOD5 |
| Content (wt.) | 6000 | 168 | 213 | 121 | 3200 |
The processing method comprises the following steps:
(1) the corn starch wastewater enters a comprehensive adjusting tank for aeration, and the aeration rate is 2m3/(m2H) obtaining the effluent of the comprehensive adjusting tank;
(2) the effluent of the comprehensive regulating reservoir enters a distribution reservoir and is added with NaHCO added by a first dosing device3Mixing the buffer solutions, and adjusting pH value is 8.5, and steam is heated to 36 ℃, so that water discharged from the distribution pool is obtained;
(3) enabling the outlet water of the distribution tank to enter an IC anaerobic tower, controlling the oxidation-reduction potential of the anaerobic tower to be 400mv and the dissolved oxygen to be 0.1mg/L, and carrying out anaerobic digestion for 2 days to obtain the outlet water of the IC anaerobic tower;
(4) the effluent of the IC anaerobic tower enters an anoxic tank for first anoxic treatment, the dissolved oxygen in the water is 0.2mg/L during the first anoxic treatment, and the carbon-nitrogen ratio is 4: 1, obtaining effluent of an anoxic pond and first sludge, wherein the first sludge flows back to an IC anaerobic tower according to 300%;
(5) the effluent of the anoxic tank enters an A/O aerobic tank for hydraulic retention for 3 days, and a second anoxic treatment and an aerobic treatment are circularly performed in the anoxic zone and the aerobic zone, wherein the dissolved oxygen of the second anoxic treatment is 0.15mg/L, and the aeration rate is 0.8m3/(m2H), 4mg/L of dissolved oxygen and 5m of aeration rate in the aerobic treatment3/(m2H), refluxing 360 percent of water in the aerobic zone to the anoxic zone to obtain effluent of the A/O aerobic tank, wherein the sludge sedimentation ratio of the A/O aerobic tank is 70 percent;
(6) the effluent of the A/O aerobic tank enters a secondary sedimentation tank for sedimentation to obtain effluent of the secondary sedimentation tank and second sludge, wherein the second sludge flows back to the anoxic tank according to the reflux ratio of 180 percent and flows back to the A/O aerobic tank according to the reflux ratio of 280 percent;
(7) the effluent of the secondary sedimentation tank enters a chemical dephosphorization reaction tank, an alkaline agent NaOH is added through a second dosing device until the pH value of the liquid is 10, and 0.1kg/m of the alkaline agent NaOH is added at the same time3The phosphorus removing agent SPT-P5 to obtain the effluent of the phosphorus removing reaction tank;
(8) the water discharged from the dephosphorization reaction tank enters a magnetic flocculation reaction tank, and magnetic powder with the particle size of 50 meshes and 0.012kg/m are added through a third dosing device3Polyacrylamide coagulant and 0.45kg/m3Polymerizing an aluminum chloride flocculating agent to obtain the effluent of the magnetic flocculation reaction tank;
(9) the effluent of the magnetic flocculation reaction tank enters a magnetic flocculation sedimentation tank for sedimentation to obtain final effluent and third sludge, wherein the sedimentation tank is a radial sedimentation tank, the linear speed of a mud scraper in the sedimentation tank is 3m/min, the rotating speed is 3r/h, and the surface load of the sedimentation tank is 1m3/m2·h；
(10) The rest part of the second sludge and the third sludge enter a sludge tank for aeration and stirring, and the effluent of the sludge tank enters a sludge dewatering device and is mixed with 0.0004kg/m3And (3) mixing the cationic flocculant and then performing plate-frame filter pressing to obtain concentrated sludge with the water content of 80% and sludge dehydration produced water, wherein the sludge dehydration produced water enters a comprehensive regulating tank, and the concentrated sludge is further treated as solid waste.
The water quality was monitored in the above steps and the results are reported in table 4.
TABLE 4 quality of effluent at each stage (unit: mg/L)
As can be seen from Table 4, the combined treatment method of the IC anaerobic tower, the anoxic tank, the A/O aerobic tank, the chemical phosphorus removal and the magnetic flocculation, provided by the utility model, can effectively remove organic matters, nitrogen and phosphorus pollution in the corn starch wastewater, and each index of the obtained final produced water meets the requirement of the enterprise recycling standard.
Example 3
The water quality of the corn starch wastewater treated by the treatment system of the utility model is shown in the following table 5:
TABLE 5 corn starch wastewater quality (unit: mg/L)
| Index of water quality | COD | NH3-N | TN | TP | BOD5 |
| Content (wt.) | 5000 | 120 | 180 | 90 | 2500 |
The processing method comprises the following steps:
(1) the corn starch wastewater enters a comprehensive adjusting tank for aeration, and the aeration rate is 4m3/(m2H) obtaining the effluent of the comprehensive adjusting tank;
(2) the water discharged from the comprehensive adjusting tank enters a distribution tank, is mixed with 30 wt% d of sodium hydroxide solution added by a first dosing device, the pH value is adjusted to 8, and the water is heated to 37 ℃ by steam to obtain the water discharged from the distribution tank;
(3) enabling the outlet water of the distribution tank to enter an IC anaerobic tower, controlling the oxidation-reduction potential of the anaerobic tower to be-450 mv and the dissolved oxygen to be 0.15mg/L, and carrying out anaerobic digestion for 3 days to obtain the outlet water of the IC anaerobic tower;
(4) the effluent of the IC anaerobic tower enters an anoxic tank for first anoxic treatment, the dissolved oxygen in the water is 0.15mg/L during the first anoxic treatment, and the carbon-nitrogen ratio is 4.5:1, obtaining effluent of an anoxic pond and first sludge, wherein the first sludge flows back to an IC anaerobic tower according to 300%;
(5) the effluent of the anoxic tank enters an A/O aerobic tank for hydraulic retention for 3.5 days, and a second anoxic treatment and an aerobic treatment are circularly performed in the anoxic zone and the aerobic zone, wherein the dissolved oxygen of the second anoxic treatment is 0.1mg/L, and the aeration rate is 0.6m3/(m2H), dissolved oxygen of 4.5mg/L and aeration amount of 5.5m in aerobic treatment3/(m2H), refluxing 400% of water in the aerobic zone to the anoxic zone to obtain effluent of the A/O aerobic tank, wherein the sludge sedimentation ratio of the A/O aerobic tank is 75%;
(6) the effluent of the A/O aerobic tank enters a secondary sedimentation tank for sedimentation to obtain effluent of the secondary sedimentation tank and second sludge, wherein the second sludge flows back to the anoxic tank according to the reflux ratio of 180 percent and flows back to the A/O aerobic tank according to the reflux ratio of 280 percent;
(7) the effluent of the secondary sedimentation tank enters a chemical phosphorus removal reaction tank, and an alkaline agent NaOH is added through a second dosing device until the pH value of the liquid is 9.5, and 0.05kg/m is added at the same time3The phosphorus removing agent SPT-P5 to obtain the effluent of the phosphorus removing reaction tank;
(8) the water discharged from the phosphorus removal reaction tank enters a magnetic flocculation reaction tank, and magnetic powder with the particle size of 80 meshes and 0.01kg/m are added through a third dosing device3Polyacrylamide coagulant and 0.4kg/m3Polymerizing an aluminum chloride flocculating agent to obtain the effluent of the magnetic flocculation reaction tank;
(9) the effluent of the magnetic flocculation reaction tank enters a magnetic flocculation sedimentation tank for sedimentation to obtain final effluent and third sludge, wherein the sedimentation tank is a radial sedimentation tank, the linear velocity of a mud scraper in the sedimentation tank is 2.5m/min, the rotating speed is 2r/h, and the surface load of the sedimentation tank is 0.6m3/m2·h；
(10) The rest part of the second sludge and the third sludge enter a sludge tank for aeration and stirring, and the effluent of the sludge tank enters a sludge dewatering device and is mixed with 0.0003kg/m3And (3) mixing the cationic flocculant and then performing plate-frame filter pressing to obtain concentrated sludge with the water content of 75% and sludge dehydration produced water, wherein the sludge dehydration produced water enters a comprehensive regulating tank, and the concentrated sludge is further treated as solid waste.
The water quality was monitored in the above steps and the results are reported in table 6.
TABLE 6 Water quality of effluent at each stage (unit: mg/L)
As can be seen from Table 6, the combined treatment system of the IC anaerobic tower, the anoxic tank, the A/O aerobic tank, the chemical phosphorus removal tank and the magnetic flocculation tank, provided by the utility model, can effectively remove organic matters, nitrogen and phosphorus pollution in the corn starch wastewater, and each index of the obtained final produced water meets the requirement of the enterprise recycling standard.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A corn starch wastewater treatment system is characterized by comprising a comprehensive adjusting tank, wherein a first aeration device is arranged in the comprehensive adjusting tank;
the inlet of the distribution tank is communicated with the outlet of the comprehensive adjusting tank, the distribution tank is communicated with a heating device and a first dosing device, and the first dosing device is used for adding a pH value adjusting agent into the distribution tank;
the inlet of the IC anaerobic tower is communicated with the outlet of the distribution tank, and the IC anaerobic tower contains activated sludge;
the inlet of the anoxic tank is communicated with the outlet of the IC anaerobic tower, the anoxic tank is provided with a first sludge outlet and a first water outlet, and the first sludge outlet is communicated with the sludge inlet of the IC anaerobic tower; the anoxic tank contains activated sludge;
the inlet of the anoxic zone is communicated with the first water outlet of the anoxic tank; the anoxic zone is provided with a second aeration device, and the aerobic zone is provided with a third aeration device; the anoxic zone and the aerobic zone contain activated sludge;
the inlet of the secondary sedimentation tank is communicated with the aerobic zone outlet of the A/O aerobic tank, the secondary sedimentation tank is provided with a second sludge outlet and a second water outlet, and the second sludge outlet is communicated with the sludge inlet of the A/O aerobic tank and the sludge inlet of the anoxic tank;
the inlet of the chemical phosphorus removal reaction tank is communicated with the water outlet of the secondary sedimentation tank, the chemical phosphorus removal reaction tank is communicated with a second medicine adding device, and the second medicine adding device is used for adding an alkaline agent and a phosphorus removing agent into the chemical phosphorus removal reaction tank;
the inlet of the magnetic flocculation reaction tank is communicated with the outlet of the chemical phosphorus removal reaction tank, the magnetic flocculation reaction tank is communicated with a third dosing device, and the third dosing device is used for adding magnetic seeds, a coagulant and a flocculant into the magnetic flocculation reaction tank;
the inlet is with the magnetism flocculation and precipitation pond of magnetism flocculation and reaction pond export intercommunication, magnetism flocculation and precipitation pond is equipped with third mud export and clear water export.
2. The corn starch wastewater treatment system of claim 1, wherein a double-layer three-phase separator is provided in the IC anaerobic tower.
3. The corn starch wastewater treatment system of claim 1, wherein the secondary sedimentation tank is a radial sedimentation tank.
4. The corn starch wastewater treatment system of claim 1, wherein the magnetic flocculation sedimentation tank is a radial sedimentation tank.
5. The corn starch wastewater treatment system of claim 1, further comprising:
the sludge tank is communicated with a sludge outlet of the secondary sedimentation tank and a sludge outlet of the magnetic flocculation sedimentation tank, and is provided with a fourth aeration device;
the inlet is communicated with the sludge dewatering device of the sludge pool outlet, the sludge dewatering device is provided with a concentrated sludge outlet and a water outlet, and the water outlet is communicated with the water inlets of the sludge pool and the comprehensive adjusting tank.
6. The corn starch wastewater treatment system of claim 1, further comprising a clean water tank having an inlet in communication with the clean water outlet of the magnetic flocculation sedimentation tank.
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|---|---|---|---|
| CN202023336262.5U CN215517067U (en) | 2020-12-31 | 2020-12-31 | Corn starch effluent disposal system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023336262.5U CN215517067U (en) | 2020-12-31 | 2020-12-31 | Corn starch effluent disposal system |
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