CN117303677A - High-efficiency nitrogen and phosphorus removal treatment system and method for domestic sewage with high phosphorus content - Google Patents
High-efficiency nitrogen and phosphorus removal treatment system and method for domestic sewage with high phosphorus content Download PDFInfo
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- CN117303677A CN117303677A CN202311611515.0A CN202311611515A CN117303677A CN 117303677 A CN117303677 A CN 117303677A CN 202311611515 A CN202311611515 A CN 202311611515A CN 117303677 A CN117303677 A CN 117303677A
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 121
- 239000011574 phosphorus Substances 0.000 title claims abstract description 121
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000010865 sewage Substances 0.000 title claims abstract description 79
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 37
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 239000010802 sludge Substances 0.000 claims abstract description 36
- 239000000945 filler Substances 0.000 claims abstract description 25
- 239000002068 microbial inoculum Substances 0.000 claims abstract description 23
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 238000007885 magnetic separation Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
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- 238000001556 precipitation Methods 0.000 claims description 8
- 241000224483 Coccidia Species 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 238000010908 decantation Methods 0.000 claims description 5
- 238000004659 sterilization and disinfection Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 21
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- 230000000052 comparative effect Effects 0.000 description 34
- 244000005700 microbiome Species 0.000 description 15
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- 238000005265 energy consumption Methods 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101710088194 Dehydrogenase Proteins 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
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- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a high-efficiency nitrogen and phosphorus removal treatment system and method for domestic sewage with high phosphorus content, and relates to the field of sewage treatment. The high-efficiency nitrogen and phosphorus removal treatment system for the high-phosphorus content domestic sewage comprises a coarse grid area, a fine grid area, a primary sedimentation tank, a plurality of CAST reaction tanks, a denitrification filter tank and a magnetic separation sedimentation tank which are sequentially communicated, wherein the CAST reaction tanks comprise a biological selection area, a facultative area and a main reaction area which are sequentially arranged, the main reaction area is provided with a plurality of micro-nano bubble generating devices and a plurality of MBBR fillers, and a phosphorus removal microbial inoculum is further added in the main reaction area. The invention uses the CAST reaction tank, the micro-nano bubble generating device, the MBBR filler and the dephosphorization bacterial agent in a combined way, not only can greatly improve the biological denitrification and dephosphorization effect of the treatment system and reduce the use of the dephosphorization agent, but also can properly reduce the power consumption and the sludge.
Description
Technical Field
The invention relates to the field of domestic sewage treatment, in particular to a high-efficiency nitrogen and phosphorus removal treatment system and method for domestic sewage with high phosphorus content.
Background
In coastal areas, the sea water product processing industry is developed, and the use of phosphorus-containing water retention agents in large amounts generates a large amount of sea water product processing wastewater each day, which contains not only high nitrogen but also high phosphorus. The sewage in the aquatic product processing in these areas is often collected and mixed to a domestic sewage treatment plant through a pipeline to be treated, so that the total phosphorus concentration of sewage in the domestic sewage treatment plant is above 7mg/L for a long time, and the peak time can be above 30 mg/L. At present, high-concentration phosphorus-containing sewage can be treated only by adding a large amount of phosphorus removal agents, and the generated sludge is large, so that the operation cost of sewage treatment is too high. In addition, the dephosphorization agent is a chemical agent, which also causes the problems of secondary pollution, higher energy consumption, more sludge treatment cost, and the like.
It can be seen that there is still a need for improvement and improvement in the prior art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a high-efficiency nitrogen and phosphorus removal treatment system and method for high-phosphorus content domestic sewage, which aims to reduce the use of phosphorus removal agents, electricity consumption and treatment cost of high-concentration phosphorus-containing sewage.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus content domestic sewage, which comprises a coarse grid area, a fine grid area, a primary sedimentation tank, a plurality of CAST reaction tanks, denitrification filters and a magnetic separation sedimentation tank which are sequentially communicated, wherein each CAST reaction tank comprises a biological selection area, a facultative area and a main reaction area which are sequentially arranged, and the main reaction area is provided with a micro-nano bubble generating device and an MBBR filler; and a phosphorus removal microbial inoculum is also added into the main reaction zone, wherein the phosphorus removal microbial inoculum comprises one or more of four coccidian microbial inoculum, ceramic's microbial inoculum, streptococcus microbial inoculum and acinetobacter microbial inoculum.
The high-efficiency nitrogen and phosphorus removal treatment system for the high-phosphorus content domestic sewage is characterized in that the bottom of the biological selection area is communicated with the bottom of the facultative area, and the upper part of the facultative area is communicated with the upper part of the main reaction area; the water outlet of the main reaction zone is arranged at the top of the main reaction zone.
The high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content comprises a plurality of biological selection tanks which are sequentially connected, wherein the tops of the biological selection tanks are sequentially communicated; in the biological selection area, the bottom of the last biological selection pool is communicated with the facultative area.
The high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content is characterized in that an included angle between the air outlet direction of the micro-nano bubble generating device and the water inlet direction of the main reaction zone is 30-60 degrees.
The high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content is characterized in that the micro-nano bubble generating device is provided with a lifting device, and the height of a micro-nano bubble generating area of the micro-nano bubble generating device is equal to the height of sludge.
The high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content is characterized in that the filling rate of the MBBR filler in the main reaction zone is 18-22%.
The high-efficiency nitrogen and phosphorus removal treatment system for the high-phosphorus content domestic sewage is characterized in that an MBBR zone is arranged in the main reaction zone and is formed by enclosing a screen; the MBBR packing is arranged in the MBBR zone; a filler stirrer is arranged in the MBBR zone; the bottom of the MBBR zone is provided with an auxiliary aeration device.
The invention provides a treatment method for high-efficiency nitrogen and phosphorus removal of domestic sewage, which adopts the treatment system for high-efficiency nitrogen and phosphorus removal of the domestic sewage with high phosphorus content to treat, and comprises the following steps:
s100, conveying the sewage pretreated by the coarse grid area, the fine grid area and the primary sedimentation tank to a CAST reaction tank through a water distribution well, and enabling the sewage to enter a main reaction area after sequentially passing through a biological selection area and a facultative area;
s200, sequentially performing water inlet micro-aeration, precipitation and decantation on the main reaction zone; wherein, after the main reaction area is filled with water, the micro-nano bubble generating device is automatically started;
s300, sewage after the water decanting process is treated by a denitrification filter and a magnetic separation sedimentation tank in sequence, and finally is discharged after ultraviolet disinfection.
The method for efficiently denitrifying and dephosphorizing the domestic sewage comprises the following steps that S100 also comprises adding a dephosphorizing bacterial agent into a main reaction zone, wherein the dephosphorizing bacterial agent comprises one or more of four-coccidium bacterial agent, ceramic bacterial agent and acinetobacter bacterial agent; the addition amount of the four-coccidium microbial inoculum, the ceramic-type microbial inoculum and the acinetobacter microbial inoculum is 0.001-0.003% of the volume of sewage in the main reaction area.
The treatment method for high-efficiency denitrification and dephosphorization of domestic sewage comprises the steps that the pH value of the water body of the CAST reaction tank is 6.5-7.4; the temperature of the water body is 20-30 ℃.
The beneficial effects are that:
the invention provides a high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content, which is characterized in that a micro-nano bubble generating device, an MBBR filler and a phosphorus removal microbial agent are combined on the basis of a CAST reaction tank, so that the growth environment of phosphorus removal microorganisms is improved, and phosphorus accumulating bacteria are in an advantageous position in competition with polysaccharide bacteria. Greatly improves the biological phosphorus gathering effect of microorganisms and enhances the biological phosphorus removal effect on high-phosphorus domestic sewage, thereby effectively reducing the use of phosphorus removal agents and lowering the treatment cost of high-concentration phosphorus-containing sewage. In addition, the treatment system can also reduce the output and energy consumption of sludge.
The invention provides a treatment method for high-efficiency nitrogen and phosphorus removal of domestic sewage, which adopts the treatment system for high-efficiency nitrogen and phosphorus removal of the domestic sewage with high phosphorus content, and can effectively remove phosphorus in the sewage by adopting a CAST process and combining a micro-nano bubble generating device, an MBBR filler and a phosphorus removal microbial inoculum.
Drawings
FIG. 1 is a schematic diagram of a high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content.
Fig. 2 is a schematic structural diagram of a CAST reaction tank.
FIG. 3 is a schematic diagram of the structure of the main reaction zone.
Fig. 4 is a schematic structural view of the packing agitator.
Fig. 5 is a schematic structural diagram of a micro-nano bubble generating device.
FIG. 6 is TP and NH at day 3, 8, to day 3, 31 of example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 7 shows TP and NH at 4 months 1 day to 5 months 5 days for example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 8 is TP and NH at 5 month 6 day to 6 month 2 day for example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 9 shows TP and NH at 6 months 3 to 6 months 27 for example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 10 shows TP and NH at 28 days 6 to 24 days 7 months for example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 11 shows TP and NH at 25 days 7 months to 31 days 7 months for example 1 and comparative examples 1-3 3 -N removal rate results.
FIG. 12 shows chemical sludge production in example 1 and comparative example 2.
Fig. 13 is the power consumption of the prior art and example 1.
Description of main reference numerals: 1-coarse grille area, 2-fine grille area, 3-primary sedimentation tank, 4-CAST reaction tank, 5-denitrification filter tank, 6-magnetic separation sedimentation tank, 41-biological selection area, 42-facultative area, 43-main reaction area, 44-micro-nano bubble generating device, 45-MBBR packing, 441-lifting device, 442-gas pipeline, 443-flowmeter, 444-pressure gauge, 445-water pump box, 446-auxiliary aeration device, 447-packing stirrer and 448-screen.
Detailed Description
The invention provides a high-efficiency nitrogen and phosphorus removal treatment system and method for domestic sewage with high phosphorus content, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and further detailed description of the invention is provided below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1-3, the first aspect of the present invention provides a high-efficiency denitrification and dephosphorization treatment system for domestic sewage with high phosphorus content, which comprises a coarse grid zone 1, a fine grid zone 2, a primary sedimentation tank 3, a plurality of CAST reaction tanks 4, denitrification filters 5 and a magnetic separation sedimentation tank 6 which are sequentially communicated, wherein the CAST reaction tanks 4 comprise a biological selection zone 41, a facultative zone 42 and a main reaction zone 43 which are sequentially arranged, and the main reaction zone 43 is provided with a plurality of micro-nano bubble generating devices 44 and a plurality of MBBR fillers 45; a phosphorus removal microbial agent is also added into the main reaction zone 43, and the phosphorus removal microbial agent comprises one or more of four coccidian microbial agents, ceramic microbial agents, streptococcus microbial agents and acinetobacter microbial agents.
Wherein the coarse grille area 1 is used for intercepting large garbage; the fine grid area 2 is used for intercepting and precipitating small garbage and particulate pollutants; the primary sedimentation tank 3 is used for precipitating small garbage and particulate pollutants.
The micro-nano bubble generation device 44 can effectively promote the growth of microorganisms such as phosphorus accumulating bacteria, improve the activity of dehydrogenase and the content of extracellular polymer, increase the thickness of biological membranes and greatly improve the processing capacity of biochemical units.
And the addition of the phosphorus accumulating microbial agent ensures the seed source of the biological phosphorus removing microorganism. The micro-nano bubble generating device 44 and the regulation means ensure the effect of improving the abundance of the phosphorus-accumulating microorganisms and biologically removing phosphorus.
The MBBR packing 45 has large specific surface area and high microbial biomass. The surface of the modified polyurethane has good hydrophilicity, electrophilicity and biological affinity, and provides guarantee for the adhesion of microorganisms. The biological film can grow on the MBBR packing 45, the metabolic activity of the biological film and the active sludge have certain difference, and the biological film is beneficial to removing COD and can better promote the denitrification and dephosphorization effects.
The MBBR packing 45 also increases the sludge concentration per unit volume of the reactor, enhancing the impact load capacity of the system. The MBBR filler 45 also reduces sludge bulking and thus sludge volume. The MBBR filler 45 has nitrifying bacteria and denitrifying bacteria attached thereon, which can also increase the denitrification efficiency, reduce the loss of microorganisms and reduce the generation of sludge.
The physiological activity of the phosphorus accumulating bacteria can enrich more phosphorus elements, and phosphorus in the sewage is removed by discharging excess sludge with more phosphorus accumulating bacteria. The MBBR filler 45 is a suspended filler, and can increase the area of microorganism adhesion growth, thereby increasing the contact area of microorganisms and sewage. The phosphorus accumulating bacteria are aerobic bacteria, grow better in water environment with higher dissolved oxygen, and micro-nano bubbles are mainly dispersed upwards in the running process and can greatly promote the growth of the phosphorus accumulating bacteria and promote the biological phosphorus accumulating effect after fully contacting with the MBBR filler 45 suspended in water. Through biological dephosphorization, the use of dephosphorization medicament can be reduced, the running cost can be reduced, and the production of sludge can be reduced. The micro-nano bubble MBBR technology is utilized to enhance the activity of microorganisms and improve the metabolism of the microorganisms, so that the pollutants are degraded faster, thereby forcing the microorganisms to enter the endogenous metabolism, reducing the sludge discharge amount of about 10% of the system, and relieving the operation pressure of the system.
Specifically, the bottom of the bioselective zone 41 communicates with the bottom of the facultative zone 42, and the upper portion of the facultative zone 42 communicates with the upper portion of the main reaction zone 43; the water outlet of the main reaction zone 43 is arranged at the top of the main reaction zone 43. Upon inflow, the wastewater enters from the top of the bioselective zone 41, then enters from the bottom of the bioselective zone 41 into the bottom of the facultative zone 42, and finally enters from the upper portion of the facultative zone 42 into the main reaction zone 43.
In the CAST reaction tank 4, the biological selection area 41 keeps an anaerobic environment, the rapid adsorption of activated sludge is utilized to accelerate the removal of a soluble substrate, the acidification and hydrolysis effects on refractory organic matters are achieved, meanwhile, the excessive absorbed phosphorus in the sludge can be effectively released under anaerobic conditions, a series of biochemical effects are completed, and the aim of denitrification and dephosphorization is achieved; the facultative zone 42 is operated under facultative conditions which primarily remove organics by activated sludge adsorption while promoting further release of phosphorus and enhancing nitrogen nitrification/denitrification and restoring sludge activity through aeration and idle phases. In operation, the main reaction zone 43 contains 4 "water inlet micro-aeration, precipitation, decantation" processes. Each CAST reaction tank 4 realizes continuous water inlet and outlet through continuously converting the working state, thereby achieving the purpose of sewage treatment.
Preferably, the biological selection area 41 comprises a plurality of biological selection tanks which are sequentially connected, and the tops of the biological selection tanks are sequentially communicated; in the biological selection area 41, the bottom of the last biological selection tank is communicated with the facultative area 42. Specifically, the bioselective zone 41 includes 5 bioselective cells connected in sequence, the bioselective cell 1 is filled with water and flows into the bioselective cell 2 from the top, and so on, and the bioselective cell 5 is connected at the bottom to the facultative zone 42. By providing a plurality of biological selection tanks, the residence time of the sewage in the biological selection area 41 can be increased, and the denitrification and dephosphorization effects of the living beings can be improved.
Preferably, the facultative zone 42 consists of a bar-shaped tank into which sewage enters from one end and directly flows into the main reaction zone 43 from the bottom of the other end.
The micro-nano bubble generation device 44 generates micro-nano bubbles having a diameter of 50 microns or less, wherein about 10% of the micro-nano bubbles are nano-sized bubbles, about 90% of the micro-nano bubbles are micro-sized bubbles, and a very small number of the micro-nano bubbles are millimeter-sized large bubbles. The micro-nano bubble generating device 44 can generate micro-nano bubbles efficiently and simultaneously can rapidly and uniformly increase the dissolved oxygen of the water body.
Compared with the original system without the micro-nano bubble generating devices 44, the energy consumption is reduced by about 10% after two micro-nano bubble generating devices 44 are added, and the use of the micro-nano bubble generating devices 44 can improve the efficiency of increasing the dissolved oxygen in the water body, so that the use of the original aeration equipment can be reduced.
Referring to fig. 5, preferably, the micro-nano bubble generating device 44 is provided with a lifting device 441, and the height of the micro-nano bubble generating area of the micro-nano bubble generating device 44 is equal to the height of the sludge.
Preferably, the water suction port depth of the micro-nano bubble generating device 44 is set below the sludge level.
Specifically, under the action of the lifting device 441, the micro-nano bubble generating area of the micro-nano bubble generating device 44 may change with the height of the sludge. In addition, the micro-nano bubble generating device 44 can adjust the depth of the device according to the water inflow amount so as to ensure the full effect on the sludge.
Referring to fig. 3 and 5, preferably, the micro-nano bubble generating device 44 includes a pump tank 445, and a water pump and a micro-nano bubble generator disposed in the pump tank 445; the micro-nano bubble generator is connected with a gas pipeline 442; specifically, the gas pipe 442 is provided with a gas flowmeter 443 and a pressure gauge 444; the water pump is connected with the micro-nano bubble generator to provide water source and power for the micro-nano bubble generator, and the micro-nano bubbles are mixed with water and then ejected. The wall of the water pump box 445 is provided with a plurality of filtering holes, and the water pump box 445 is internally provided with water inlet holes so as to prevent particulate matters, garbage and the like in the pond from entering the water pump box 445, reduce the probability of water pump blockage faults and prolong the service life.
Preferably, the included angle between the air outlet direction of the micro-nano bubble generating device 44 and the water inlet direction of the main reaction zone 43 is 30-60 degrees, so that a loop is formed in the tank body of the main reaction zone 43 by the water body, and the mixing effect of the activated sludge and the sewage is improved. Preferably, an auxiliary aeration device 446 is disposed at one side of the tank body of the main reaction zone 43, and the micro-nano bubble generating device 44 is disposed at the opposite side of the auxiliary aeration device 446.
Preferably, the filling rate of the MBBR packing 45 in the main reaction zone 43 is 18% -22%. Too large a filling rate of MBBR packing 45 is unfavorable for water flow, and too small a filling rate is insufficient for microorganism adhesion area.
Preferably, the ratio of air to water in the main reaction zone 43 is (7.8 to 8.2): 1. The ratio of air to water is the ratio of the aeration rate per hour to the water inflow per hour. Too much or too little aeration can affect the oxygen content of the water body, thereby affecting the growth of microorganisms.
Referring to FIGS. 3 and 4, preferably, the primary reaction zone 43 is provided with an MBBR zone surrounded by screens 448; the MBBR packing 45 is disposed within the MBBR zone; a filler stirrer 447 is arranged in the MBBR zone; the bottom of the MBBR zone is provided with an auxiliary aeration device 446. Preferably, the auxiliary aeration device 446 is an bubbling pipe having a plurality of holes. By providing an MBBR zone, and by providing both a dedicated filler agitator 447 and an auxiliary aeration 446 in the MBBR zone, it is ensured that the MBBR filler 45 is well fluidized and does not flow out with the water.
Preferably, in constructing the system, sludge from the other CAST reaction tanks 4 is added to the main reaction zone 43, and the sludge age of the sludge is controlled to 15 to 25 days. The decay speed of the phosphorus accumulating bacteria is slower, and sludge with longer sludge age is selected, so that the quantity of the phosphorus accumulating bacteria in the sludge is increased, and a high-efficiency phosphorus removing system is quickly established.
The second aspect of the invention provides a treatment method for efficient denitrification and dephosphorization of domestic sewage, which adopts the treatment system, and comprises the following steps:
s100, conveying the sewage pretreated by the coarse grid area 1, the fine grid area 2 and the primary sedimentation tank 3 to the CAST reaction tank 4 through a distributing well, and enabling the sewage to enter a main reaction area 43 after sequentially passing through a biological selection area 41 and a facultative area 42;
s200, sequentially performing water inlet micro-aeration, precipitation and decantation on the main reaction zone 43; wherein, the main reaction zone 43 firstly carries out micro-aeration within 30-35 min after water inflow starts, and then the full-tank aeration process is started, in the micro-aeration process, only the micro-nano bubble generating device 44 and the filler stirrer 447 are started, and the auxiliary aeration device 446 is not started, so that the concentration of dissolved oxygen is maintained at 0.2-0.3 mg/L, and the phosphorus accumulating bacteria have sufficient phosphorus release condition and splitting growth time; the micro-nano bubble generating device 44 starts to be automatically started as soon as water enters the main reaction zone 43 so as to accelerate the rapid and full mixing between the inlet sewage and the precipitated activated sludge;
s300, sewage after the decanting process is treated by a denitrification filter 5 and a magnetic separation sedimentation tank 6 in sequence, and finally is discharged after ultraviolet disinfection.
Preferably, in the water inlet micro-exposure process, the height of water inlet to the liquid level is 4.8-5.2 m;
in the aeration process, a filler stirrer 447 is closed, and a micro-nano bubble generating device 44 and an auxiliary aeration device 446 are opened together so that the concentration of dissolved oxygen reaches 2-4 mg/L, and the duration time is 85-95 min; too high a concentration of dissolved oxygen is not favorable for the growth of denitrifying phosphorus accumulating bacteria on the one hand and causes an increase in energy consumption on the other hand.
The duration of the precipitation process is 60-70 min, the micro-nano bubble generating device 44 and the auxiliary aeration device 446 are closed, and the precipitation process stops aeration so that the concentration of dissolved oxygen is reduced to below 0.5mg/L, and the preparation is made for the low dissolved oxygen environment required for the beginning of the next period.
In the water decanting process, the liquid level height is 2.8-3.2 m when water decanting is finished.
Preferably, the sludge concentration of the main reaction zone is controlled within 3000-4000 mg/L.
Preferably, the step S100 further comprises adding a microbial agent to the main reaction zone 43, wherein the microbial agent includes one or more of Tetrasphaera (Tetrasphaera), terrestris (Thauera), streptococcus (Streptococcus) and Acinetobacter (Acinetobacter); the concentrations of the four coccidian bacteria agent, the ceramic bacteria agent, the streptococcus bacteria agent and the acinetobacter bacteria agent are all more than 1 multiplied by 10 9 CFU/mL, the added bacterial liquid is 0.001-0.003% of the sewage volume in the main reaction zone 43.
The tetracoccidium bacteria can utilize macromolecular organic matters (such as glucose, amino acid and the like) and volatile amino acid VFAs to carry out anaerobic phosphorus release, and then complete aerobic and even anoxic phosphorus absorption processes. The ceramic bacteria, the streptococcus agent and the acinetobacter can effectively solve the problem of competition of denitrifying bacteria and phosphorus accumulating bacteria on carbon sources, and achieve the aim of synchronous denitrification and dephosphorization.
Preferably, the pH of the water body of the CAST reaction tank is 6.5-7.4. When the pH of the water body is weak acidity or weak alkalinity, the growth of phosphorus accumulating bacteria is not facilitated. The relatively low-temperature water environment is favorable for the growth of phosphorus accumulating bacteria and improves the phosphorus removal effect. At pH 6.5 to 7.4, NH compared to ph=6 and 8 3 The best removal of N and TN is achieved; NH at pH < 5 and pH > 9 3 The removal rates of N and TN are markedly reduced.
Preferably, the temperature of the water body of the CAST reaction tank is 20-30 ℃. If the temperature of the water body is above 30 ℃, the dephosphorization effect can be greatly reduced. The above temperature and pH ranges are more conducive to the growth and propagation of four coccidian bacteria.
The invention is further illustrated by the following specific examples and comparative examples.
Example 1
A high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content comprises a coarse grid area 1, a fine grid area 2, a primary sedimentation tank 3 and four parallel connection devices which are communicated in sequenceThe device comprises a CAST reaction tank 4, a denitrification filter tank 5 and a magnetic separation sedimentation tank 6, wherein the CAST reaction tank 4 comprises a biological selection area 41, a facultative area 42 and a main reaction area 43 which are sequentially arranged, and the main reaction area 43 is provided with a micro-nano bubble generating device 44 and an MBBR packing 45; the filling rate of the MBBR packing 45 in the main reaction zone 43 is 19%; in this embodiment, the volume of the main reaction zone 43 is 6480m 3 When the filling rate is 19%, 1230m of the pond body of each main reaction zone 43 is added 3 MBBR filler 45 of (b); wherein the specification of the MBBR packing 45 is phi 25 multiplied by 10mm, and the effective specific surface area of the suspended packing is 800m < m >/m < m >; the packing stirrer 447 is provided with 6 pieces, and each piece of packing stirrer has 7.5kw of power; the auxiliary aeration device 446 is arranged in a region below 1m from the bottom of the tank;
the biological selection area 41 is provided with 5 biological selection pools which are sequentially connected, the tops of the biological selection pools are sequentially communicated, and the bottom of the last biological selection pool is communicated with the facultative area 42;
the main reaction zone 43 is provided with 2 micro-nano bubble generating devices 44 in total, the micro-nano bubble generating devices 44 are all arranged on the pool wall of the main reaction zone 43, and the included angle between the air outlet direction of the micro-nano bubble generating devices 44 and the water inlet direction of the main reaction zone 43 is 30-60 degrees; the power of the micro-nano bubble generating device 44 is 7.5kw;
the operation method of the high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content comprises the following steps:
s100, adding four coccidian bacteria agent, ceramic bacteria agent, streptococcus bacteria agent and acinetobacter bacteria agent into the main reaction zone 43, wherein the concentration of bacterial liquid is 1 multiplied by 10 9 CFU/mL, the addition amounts are all 0.02% of the volume of sewage in the main reaction zone 43;
s200, conveying the sewage pretreated by the coarse grid area 1, the fine grid area 2 and the primary sedimentation tank 3 to the CAST reaction tank 4 through a distributing well, so that the sewage sequentially passes through the biological selection area 41 and the facultative area 42 and then enters the main reaction area 43; controlling the pH of the water body in the CAST reaction tank 4 to be maintained at 6.5-7.4; the temperature of the water body is maintained at 27-30 ℃; adding proper PAC, PAM and magnetic powder into the main reaction zone according to the water inflow condition of the current-day sewage;
s300, sequentially performing water inlet micro-aeration, precipitation and decantation on the main reaction zone 43; the sewage after the decanting process is treated by a denitrification filter 5 and a magnetic separation sedimentation tank 6 in sequence, and finally is discharged after ultraviolet disinfection;
in the water inlet micro-exposure process, water is fed to the liquid level height of 5m, and the concentration of dissolved oxygen is controlled to be 0.2-0.3 mg/L;
in the aeration process, the concentration of dissolved oxygen is controlled to be 3-3.2 mg/L, and the duration time is 90min; and controlling the air-water ratio in the main reaction zone 43 to be 8:1;
the duration of the precipitation procedure is 65min;
in the decanting process, the liquid level height is 3m when decanting is finished.
Comparative example 1
A high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content is different from the treatment system in the embodiment 1 in that a CAST reaction tank is free of a micro-nano bubble generating device 44, free of an MBBR filler 45 and free of a phosphorus removal microbial inoculum.
Comparative example 2
A high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content is different from the treatment system in the embodiment 1 in that a CAST reaction tank is provided with no micro-nano bubble generating device 44, MBBR packing 45 and no phosphorus removal microbial inoculum.
Comparative example 3
A high-efficiency nitrogen and phosphorus removal treatment system for domestic sewage with high phosphorus content is different from the treatment system in the embodiment 1 in that a micro-nano bubble generating device 44, a non-MBBR packing 45 and a phosphorus removal microbial inoculum are arranged in a CAST reaction tank.
The high-phosphorus content domestic sewage is respectively input into the treatment systems established in the examples and the comparative examples, the total phosphorus concentration of the high-phosphorus content domestic sewage is more than 7mg/L for a long time, and the peak time can be more than 30 mg/L. Measurement of TP and NH of CAST reaction tank effluent 3 The concentration of-N and the removal rate (%) thereof were calculated, and the results of the removal rate (%) are shown in FIGS. 6 to 11.
As can be seen from the results of FIGS. 6 to 11, the CAST reaction tank in comparative example 1 is not provided with the micro-nano bubble generating device 44 and the MBBR-free filler 45, and the average TP removal rate is 65.69% and NH 3 The average removal of N was 83.54%;
compared with comparative example 1, in comparative example 2, the MBBR packing 45 is additionally arranged in the CAST reaction tank, the average TP removal rate is 69.78%, and the average TP removal rate is improved by 4.09% compared with comparative example 1; NH of it 3 The average removal of N was 88.57%, providing 5.03% compared to comparative example 1, demonstrating that the use of MBBR packing 45 effectively improves TP removal and NH 3 -N removal rate.
Compared with comparative example 1, the CAST reaction tank is additionally provided with the micro-nano bubble generating device 44, the average TP removal rate is 70.91%, and the average TP removal rate is improved by 5.22% compared with comparative example 1; NH of it 3 The average removal rate of N was 90.70%, which provides 7.16% compared to comparative example 1, indicating that the use of the micro-nano bubble generating device 44 can effectively improve TP removal rate and NH 3 -N removal rate.
Compared with comparative example 1, in the embodiment 1, the micro-nano bubble generating device 44, the MBBR packing 45 and the dephosphorization microbial inoculum are added in the CAST reaction tank, the average removal rate of TP is 74.88%, and is improved by 9.19% compared with comparative example 1; NH of it 3 The average removal rate of N is 93.68%, which is improved by 10.14% compared with comparative example 1; illustrating the use of micro-nano bubble generating device 44, the use of MBBR packing 45 and the addition of dephosphorizing bacteria agent can further improve TP and NH 3 Average removal rate of N and significant lifting effect.
Compared with comparative example 2, in the embodiment 1, the micro-nano bubble generating device 44 and the dephosphorization bacterial agent are added in the CAST reaction tank, the average removal rate of TP is 74.88%, and is improved by 5.10% compared with comparative example 2; NH of it 3 The average removal rate of N is 93.68%, which is improved by 5.11% compared with comparative example 2; illustrating the use of micro-nano bubble generating device 44 and the further improvement of TP and NH by adding phosphorous removal bacteria 3 Average removal rate of N and significant lifting effect.
Compared with comparative example 3, in the embodiment 1, the MBBR packing 45 and the dephosphorization microbial inoculum are added in the CAST reaction tank, the average TP removal rate is 74.88%, and is improved by 3.97% compared with comparative example 3; NH of it 3 The average removal rate of-N is 93.68%, which is improved by 2.98% compared with comparative example 3, which shows that the use of the MBBR packing 45 and the addition of the dephosphorization microbial inoculum can further improve TP and NH 3 Average removal rate of N, andand the lifting effect is obvious.
As shown in FIG. 12, the results of further examining the chemical sludge yield of example 1 and comparative example 2 show that the chemical sludge product of example 1 is reduced by 0.65t/d and the reduction can reach 26.74% compared with that of comparative example 2, indicating that the use of the micro-nano bubble generating device can effectively promote the growth of microorganisms such as phosphorus accumulating bacteria, thereby enhancing the action of MBBR filler and reducing the generation amount of sludge.
In addition, the daily average PAC dosage of the embodiment 1 is reduced by 24.36 percent compared with that of the comparative example 2, the dosage is reduced to different degrees, the operation cost is effectively reduced, and the secondary pollution is reduced. The average daily PAC dosage of comparative example 3 is reduced by 26.31% on average compared to comparative example 1.
The conventional biochemical wastewater treatment system without using the CAST reaction tank was further compared with the energy consumption of example 1, and the result is shown in fig. 13.
As can be seen from fig. 13, since the use of the micro-nano bubble generating device is increased, the operation time of the blower (the blower is used for aeration) can be reduced in example 1, and the average daily energy consumption of example 1 is 934.464 kw ·h compared with the prior art, which is reduced by 0.23% compared with the prior art. In addition, as the water inflow time period is shortened, the energy consumption advantage of the embodiment 1 is gradually increased through the calculation of the formula. Assuming that the aeration time is unchanged and the water inlet time is shortened to 30 minutes, the daily energy consumption of a normal working condition pool is 988.608 kw.h, and the energy consumption of the embodiment 1 is 960.48 kw.h. Example 1 has a 2.84% reduction in energy consumption compared to the normal operating mode pool.
In conclusion, the high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content can not only effectively improve the phosphorus removal and nitrogen removal effects, but also has the advantages of reducing sludge generation and energy consumption and has good comprehensive performance.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (10)
1. The high-efficiency nitrogen and phosphorus removal treatment system for the domestic sewage with high phosphorus content is characterized by comprising a coarse grid area, a fine grid area, a primary sedimentation tank, a plurality of CAST reaction tanks, a denitrification filter tank and a magnetic separation sedimentation tank which are sequentially communicated, wherein each CAST reaction tank comprises a biological selection area, a facultative area and a main reaction area which are sequentially arranged, and the main reaction area is provided with a micro-nano bubble generating device and MBBR filler; and a phosphorus removal microbial inoculum is also added into the main reaction zone, wherein the phosphorus removal microbial inoculum comprises one or more of four coccidian microbial inoculum, ceramic's microbial inoculum, streptococcus microbial inoculum and acinetobacter microbial inoculum.
2. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus-content domestic sewage according to claim 1, wherein the bottom of the biological selection zone is communicated with the bottom of a facultative zone, and the upper part of the facultative zone is communicated with the upper part of the main reaction zone; the water outlet of the main reaction zone is arranged at the top of the main reaction zone.
3. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus-content domestic sewage according to claim 2, wherein the biological selection area comprises a plurality of biological selection tanks which are sequentially connected, and the tops of the biological selection tanks are sequentially communicated; in the biological selection area, the bottom of the last biological selection pool is communicated with the facultative area.
4. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus-content domestic sewage according to claim 1, wherein an included angle between the air outlet direction of the micro-nano bubble generating device and the water inlet direction of the main reaction zone is 30-60 degrees.
5. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus-content domestic sewage according to claim 4, wherein the micro-nano bubble generation device is provided with a lifting device, and the height of a micro-nano bubble generation area of the micro-nano bubble generation device is equal to the height of sludge.
6. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus content domestic sewage according to claim 1, wherein the filling rate of the MBBR filler in the main reaction zone is 18% -22%.
7. The high-efficiency nitrogen and phosphorus removal treatment system for high-phosphorus content domestic sewage, as claimed in claim 1, wherein an MBBR zone is arranged in the main reaction zone and is formed by enclosing a screen; the MBBR packing is arranged in the MBBR zone; a filler stirrer is arranged in the MBBR zone; the bottom of the MBBR zone is provided with an auxiliary aeration device.
8. A method for efficiently denitrifying and dephosphorizing domestic sewage, which is characterized by adopting the high-phosphorus-content domestic sewage efficient denitrifying and dephosphorizing treatment system as claimed in any one of claims 1-7 for treatment, comprising the following steps:
s100, conveying the sewage pretreated by the coarse grid area, the fine grid area and the primary sedimentation tank to a CAST reaction tank through a water distribution well, and enabling the sewage to enter a main reaction area after sequentially passing through a biological selection area and a facultative area;
s200, sequentially performing water inlet micro-aeration, precipitation and decantation on the main reaction zone; wherein, after the main reaction area is filled with water, the micro-nano bubble generating device is automatically started;
s300, sewage after the water decanting process is treated by a denitrification filter and a magnetic separation sedimentation tank in sequence, and finally is discharged after ultraviolet disinfection.
9. The method for efficient nitrogen and phosphorus removal treatment of domestic sewage according to claim 8, wherein the step S100 further comprises adding a phosphorus removal microbial agent into the main reaction zone, wherein the phosphorus removal microbial agent comprises one or more of tetracoccidium microbial agents, ceramic microbial agents, streptococcus microbial agents and acinetobacter microbial agents; the addition amount of the four coccidian bacteria agent, the ceramic bacteria agent, the streptococcus bacteria agent and the acinetobacter bacteria agent is 0.001-0.003% of the sewage volume in the main reaction area.
10. The method for efficient denitrification and dephosphorization treatment of domestic sewage according to claim 8, wherein the pH of the water body of the CAST reaction tank is 6.5-7.4; the temperature of the water body is 20-30 ℃.
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