CN115594367A - Wastewater treatment method and wastewater treatment system - Google Patents
Wastewater treatment method and wastewater treatment system Download PDFInfo
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- CN115594367A CN115594367A CN202211569046.6A CN202211569046A CN115594367A CN 115594367 A CN115594367 A CN 115594367A CN 202211569046 A CN202211569046 A CN 202211569046A CN 115594367 A CN115594367 A CN 115594367A
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention belongs to the field of wastewater treatment, and particularly relates to a wastewater treatment method and a wastewater treatment system, wherein the wastewater treatment method comprises the following steps: s1, providing wastewater to be treated; s2, adding a coagulation reactant into the wastewater to be treated to perform coagulation reaction, and removing floating oil and suspended matters to obtain first treated water; s3, carrying out hydrolytic acidification reaction on the first treated water to obtain second treated water; s4, adding an domesticated bacterium group into the second treated water, and reacting under a facultative condition to obtain third treated water, wherein the domesticated bacterium group can perform a short-cut nitrification and denitrification process under the facultative condition; and S5, performing aerobic reaction and mud-water separation on the third treated water by using a membrane bioreactor to obtain treated water. The treatment method does not generate methane dangerous gas and concentrated water in the treatment process, is safer and more reliable, and can meet the environmental requirements of the garbage transfer station in cities.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a wastewater treatment method and a wastewater treatment system.
Background
The garbage transfer station is an important component for treating municipal domestic garbage, the waste water of the garbage transfer station has high pollution, the waste water is directly discharged into a municipal pipe network, the impact on a sewage treatment plant is large, and the normal operation of the sewage treatment plant can be influenced when the water amount is large.
The garbage transfer station mainly comprises leachate, flushing wastewater, domestic wastewater and the like generated by garbage squeezing, and has the characteristics of high pollutant concentration, complex pollutant components, large water quality change, large treatment difficulty and the like. The mode of treating the wastewater usually adopts anaerobic and aerobic combined treatment, organic macromolecules are decomposed into micromolecules by anaerobic treatment, and then aerobic treatment is carried out to ensure the efficient decomposition of aerobic bacteria.
However, this treatment has the disadvantage that the anaerobic process leads to the production of large amounts of CH 4 And the comprehensive decomposition efficiency of dangerous gases is poor, so that a large amount of concentrated wastewater is generated by continuous membrane filtration, and a new concentrated wastewater treatment problem is caused.
Disclosure of Invention
The invention mainly aims to provide a wastewater treatment method and a wastewater treatment system, aiming at providing a method for producing no CH 4 And the treatment modes of hazardous gases and concentrated wastewater.
In order to achieve the above object, the present invention provides a wastewater treatment method comprising the steps of:
s1, providing wastewater to be treated;
s2, adding a coagulation reactant into the wastewater to be treated to perform coagulation reaction, and removing floating oil and suspended matters to obtain first treated water;
s3, performing hydrolysis acidification reaction on the first treated water to obtain second treated water;
s4, adding domesticated bacteria into the second treated water, and reacting under a facultative anaerobic condition to obtain third treated water, wherein the domesticated bacteria can perform a short-cut nitrification and denitrification process under the facultative anaerobic condition;
and S5, carrying out aerobic reaction and mud-water separation on the third treated water by adopting an inorganic membrane bioreactor to obtain treated water.
Optionally, the step S1 includes:
filtering the wastewater and then tempering to obtain the wastewater to be treated; and/or the presence of a gas in the gas,
after the step S5, the method further includes:
and S6, discharging the treated water after disinfection.
Optionally, the pH value of the wastewater to be treated is 6 to 8; and/or the presence of a gas in the atmosphere,
the coagulation reactant comprises a coagulant and a coagulant aid.
Alternatively, the facultative condition is a condition in which the dissolved oxygen concentration is 0.5 mg/L; and/or the presence of a gas in the gas,
the second treated water contains 12000 to 16000mg/L of activated sludge; and/or the presence of a gas in the gas,
the acclimatization step of the acclimatized flora comprises the following steps:
taking the wastewater to be treated as a culture solution, adding sludge, and alternately culturing for 5 days by adopting aerobic and anaerobic processes, wherein the dissolved oxygen concentration is controlled to be 1-2mg/L in the aerobic stage, and the sludge age of the sludge is controlled to be 1-2.5 days;
gradually reducing the dissolved oxygen concentration until the dissolved oxygen concentration is 0.5 to 1.5mg/L, and simultaneously controlling NO 2 - The content is 2mg/L, and the culture lasts for 15d at 25 ℃;
controlling the dissolved oxygen concentration to be 0.5-1.0 mg/L, and culturing for 10d at 25 ℃ to obtain the microbial fertilizer.
Optionally, the inorganic membrane bioreactor comprises an immersed inorganic flat membrane module, and the third treated water is treated by the immersed inorganic flat membrane module to obtain the treated water subjected to the aerobic reaction and the mud-water separation, wherein the immersed inorganic flat membrane module comprises a main body material and is loaded on the main body materialThe super-hydrophilic material on the surface of the material comprises cordierite and Al 2 O 3 (ii) a And/or the presence of a gas in the gas,
12000-16000mg/L of activated sludge is contained in the third treated water.
Further, the present invention provides a wastewater treatment system comprising:
the coagulation air flotation tank is used for carrying out coagulation reaction on the wastewater and removing floating oil and suspended matters in the wastewater;
a hydrolysis acidification tank, which is used for carrying out hydrolysis acidification reaction on the wastewater which is subjected to coagulation reaction and is removed with the floating oil and the suspended matters;
the facultative reaction tank is used for carrying out reaction under the facultative condition on the wastewater subjected to the hydrolytic acidification reaction, and the reaction comprises a short-cut nitrification and denitrification reaction and a decomposition reaction of C-containing organic matters; and the number of the first and second groups,
and the inorganic flat membrane bioreactor is used for carrying out aerobic reaction and sludge-water separation on the wastewater subjected to the decomposition reaction under the facultative condition.
Optionally, the method further comprises: a downstream pipeline which sequentially communicates the coagulation air flotation tank, the hydrolysis acidification tank, the facultative reaction tank and the inorganic flat membrane bioreactor.
Optionally, the method further comprises:
a counter-flow pipeline connected between the facultative reaction tank and the inorganic flat sheet membrane bioreactor for returning water in the inorganic flat sheet membrane bioreactor to the facultative reaction tank; and/or the presence of a gas in the gas,
the inlet of the adjusting tank is connected with the precise grid, and the outlet of the adjusting tank is connected with the inlet of the coagulation air flotation tank; and/or the presence of a gas in the gas,
an inlet of the clean water tank is connected with an outlet of the inorganic flat membrane bioreactor; and/or the presence of a gas in the atmosphere,
the device comprises a sludge concentration tank, a sludge discharge pipeline and a sludge dewatering machine assembly, wherein the coagulation air flotation tank is provided with a coagulation sludge outlet, the inorganic flat membrane bioreactor is provided with a membrane reaction sludge outlet, the coagulation sludge outlet and the membrane reaction sludge outlet are respectively connected with an inlet of the sludge concentration tank through the sludge discharge pipeline, and the sludge dewatering machine assembly is connected with an outlet of the sludge concentration tank; and/or the presence of a gas in the gas,
the dosing system is used for dosing the coagulation air flotation tank to perform the coagulation reaction; and/or the presence of a gas in the gas,
and the fan assembly is respectively connected with the facultative reaction tank and the inorganic flat-plate membrane bioreactor and is used for simultaneously and/or respectively carrying out oxygen aeration on the facultative reaction tank and the inorganic flat-plate membrane bioreactor.
Optionally, the inorganic flat sheet membrane bioreactor comprises:
a membrane reaction tank;
an immersed inorganic flat membrane component arranged in the membrane reaction tank; and (c) a second step of,
and the first pump is communicated with the outlet of the membrane reaction tank and is used for discharging the water in the membrane reaction tank after passing through the immersed inorganic flat membrane module.
Optionally, the inorganic flat sheet membrane bioreactor further comprises:
the backwashing pump is used for introducing clean water to flush the immersed inorganic flat membrane component so as to strip suspended sludge deposited on the immersed inorganic flat membrane component; and/or the presence of a gas in the gas,
and the medicine washing pump is used for introducing washing medicines to wash the immersed inorganic flat membrane component.
In the invention, suspended matters and floating oil in the wastewater are removed, then long-chain organic matters in the wastewater are decomposed into micromolecular organic matters by hydrolytic acidification, and then facultative reaction is carried out under the action of domesticated bacteria, so that most organic matters can be decomposed into CO 2 Simultaneously converts ammonia nitrogen and nitrate nitrogen into N 2 Removing, and performing aerobic reaction for further decomposition and mud-water separation by using an inorganic flat membrane bioreactor to effectively treat the waste water of the garbage transfer stationThe treatment process does not produce methane dangerous gas and concentrated water, is safer and more reliable, and can meet the environmental requirements of the garbage transfer station in cities; meanwhile, the wastewater treatment method can meet the wastewater discharge standard of the transfer station, can further recycle and realize the combination of wastewater treatment and resource utilization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other relevant drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of the wastewater treatment process of the present invention;
FIG. 2 is a schematic view of a pipeline of a wastewater treatment system according to the present invention;
FIG. 3 is a schematic view of a wastewater treatment system according to the present invention;
FIG. 4 is a structural diagram of a facultative tank and a hydrolytic acidification tank;
FIG. 5 is a connection diagram of a sludge treatment apparatus;
FIG. 6 is a structural view of an inorganic flat membrane bioreactor.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between the various embodiments may be combined with each other, but must be based on the realization of the capability of a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In view of the technical defects that the existing waste water treatment mode of the waste transfer station can generate dangerous gas such as methane and concentrated waste water, the invention provides a waste water treatment method and a waste water treatment system, and the waste water treatment method comprises the following steps:
s1, providing wastewater to be treated;
s2, adding a coagulation reactant into the wastewater to be treated to perform coagulation reaction, and removing floating oil and suspended matters to obtain first treated water;
s3, performing hydrolysis acidification reaction on the first treated water to obtain second treated water;
s4, adding domesticated bacteria into the second treated water, and reacting under a facultative anaerobic condition to obtain third treated water, wherein the domesticated bacteria can perform a short-cut nitrification and denitrification process under the facultative anaerobic condition;
and S5, carrying out aerobic reaction and mud-water separation on the third treated water by adopting an inorganic membrane bioreactor to obtain treated water.
In the invention, the term "hydrolytic acidification reaction" refers to a biochemical reaction carried out extracellularly before organic matters enter microbial cells, and macromolecular organic matters which can not be degraded can be converted into micromolecular organic matters which can be degraded easily;
in the present invention, the term "short-cut nitrification-denitrification reaction" refers to NH 3 Nitrite is generated, and nitrate is not produced; and direct formation of N from nitrite 2 Known as short-cut denitrification. By short-cut nitration and denitrification is meant NH 3 ---NO 2 ----N 2 Namely a process capable of removing ammonia nitrogen from water.
In the present invention, the term "membrane bioreactor" (MBR) is a new type of wastewater treatment system that combines membrane separation technology with biological treatment technology. The membrane component replaces a secondary sedimentation tank at the tail end of the traditional biological treatment technology, the concentration of the high-activity sludge is kept in a bioreactor, the organic load of biological treatment is improved, the occupied area of a sewage treatment facility is reduced, and the excess sludge amount is reduced by keeping low sludge load. Active sludge and macromolecular organic matters in water are intercepted mainly by utilizing membrane separation equipment.
According to the invention, suspended matters and floating oil in the wastewater are removed, long-chain organic matters in the wastewater are decomposed into small-molecular organic matters by hydrolytic acidification, then most of the organic matters are decomposed under the action of acclimation bacteria capable of performing a short-range nitrification and denitrification process under the facultative aerobic condition, and finally an inorganic flat membrane bioreactor is adopted to perform aerobic reaction for further decomposition and perform sludge-water separation, so that the wastewater of the garbage transfer station is effectively treated, and no methane dangerous gas and concentrated water are generated in the treatment process, so that the method is safer and more reliable and can meet the environmental requirements of the garbage transfer station in cities; meanwhile, the wastewater treatment method can meet the wastewater discharge standard of the transfer station, can further recycle and realize the combination of wastewater treatment and resource utilization.
In some embodiments, the step S1 comprises:
filtering the wastewater, then tempering to obtain the wastewater to be treated, and filtering the wastewater to remove solid matters in the wastewater.
It should be noted that, in the present invention, when the pH of the wastewater to be treated is controlled to be 6 to 8, the subsequent coagulation effect is better, therefore, before the adding the coagulation reactant, the pH of the wastewater to be treated can be detected, and if the pH is not in the range, before the step S2, the method further includes: regulating and controlling the pH value of the wastewater to be treated to 6 to 8;
in some embodiments, in step S2, the coagulation reactant includes a coagulant and a coagulant aid, thereby achieving a coagulation reaction. While the particular coagulant and coagulant aid may be selected based on the water quality conditions, in some embodiments, the coagulant comprises at least one of PAC and PAF, and the coagulant aid comprises PAM, the combination of coagulant and coagulant aid selected being more suitable for use in waste water at a waste terminal.
In some embodiments, step S3 is performed by adding a biomimetic filler to the first treated water to increase the concentration of the anaerobic hydrolytic microorganisms.
In some embodiments, the reacting under facultative conditions in step S4 includes reacting under conditions having a dissolved oxygen concentration of 0.5 mg/L. Under the condition, the decomposition rates of the carbon-containing organic matters, the ammonia nitrogen and the nitrate nitrogen are improved.
In some embodiments, the second treated water contains 12000 to 16000mg/L of activated sludge. The content of the activated sludge in the second treated water is controlled to be the content, so that the influence of the membrane flux is small on the premise of improving the decomposition rate of organic matters.
In some embodiments, the step of acclimatizing the acclimatized flora comprises the steps of:
carrying out alternate culture for 5 days under aerobic and anoxic conditions, wherein the dissolved oxygen concentration is controlled to be 1-2mg/L in the aerobic stage, and the sludge age of the sludge is controlled to be 1-2.5 days;
gradually reducing the dissolved oxygen concentration until the dissolved oxygen concentration is 0.5 to 1.5mg/L, and simultaneously controlling NO 2 - Culturing at 2mg/L at 25 deg.C for 15 days;
controlling the dissolved oxygen concentration to be 0.5-1.0 mg/L, and culturing for 10 days at 25 ℃ to obtain the culture medium.
The wastewater to be treated is taken as the flora domesticated by the culture solution, so that the decomposition efficiency is improved. For example, when waste water from a waste transfer station is treated, the waste water to be treated is waste water from the waste transfer station.
The culture sludge may be selected based on the actual circumstances, for example, in some embodiments, the culture sludge is municipal sewage plant sludge.
In some embodiments, the inorganic membrane bioreactor comprises an immersed inorganic flat membrane module, and the third treated water is treated by the immersed inorganic flat membrane module to obtain the treated water subjected to the aerobic reaction and the mud-water separation, wherein the immersed inorganic flat membrane module comprises a main material and a super-hydrophilic material loaded on the surface of the main material, and the main material comprises cordierite and Al 2 O 3 (ii) a The submerged flat inorganic membrane has a thin pollution layer, can keep water permeability, is easy to wash surface attachments, short in water channel, small in working pressure, energy-saving and environment-friendly, and can effectively intercept organic matters and microorganisms in wastewater on the premise of not influencing membrane flux, the pore diameter of the submerged flat inorganic membrane is 50 to 100nm, and the main body material of the submerged flat inorganic membrane is cordierite and Al 2 O 3 And the surface is loaded with super-hydrophilic materials so as to have super-strong stain resistance.
In some embodiments, the third treated water contains 12000 to 16000mg/L of activated sludge. So that the membrane flux influence is small while the organic matter removal capacity is ensured.
In some embodiments, after step S5, the method further includes:
and S6, discharging the treated water after disinfection. The treated water is sterilized to be more beneficial to reuse.
Further, the present invention provides a wastewater treatment system comprising:
the coagulation air floatation tank 1 is used for carrying out coagulation reaction on the wastewater and removing floating oil and suspended matters in the wastewater;
the hydrolysis acidification pool 2 is used for carrying out hydrolysis acidification reaction on the wastewater which is subjected to the coagulation reaction and is removed with floating oil and suspended matters;
the facultative reaction tank 3 is used for carrying out reactions under the facultative condition on the wastewater subjected to the hydrolysis acidification reaction, and the reactions comprise short-cut nitrification and denitrification reactions and decomposition reactions of C-containing organic matters; and the number of the first and second groups,
and the inorganic flat membrane bioreactor 4 is used for carrying out aerobic reaction and sludge-water separation on the wastewater subjected to the decomposition reaction under the facultative condition. The wastewater treatment system can be used for realizing the wastewater treatment method.
It should be noted that the system of the present invention can adopt an integrated device form or a modular device form according to the size of the processing scale, and has the advantages of small occupied area, quick installation and investment saving.
If an integrated device is adopted, referring to fig. 2-3, the wastewater treatment system further comprises a downstream pipeline 6, and the coagulation air flotation tank 1, the hydrolysis acidification tank 2, the facultative reaction tank 3 and the inorganic flat membrane bioreactor 4 are sequentially communicated through the downstream pipeline 6.
In some embodiments, in order to filter larger impurities in the wastewater, the wastewater treatment system further comprises a regulating tank 15 and a precision grid (not shown in the figure), wherein an inlet of the regulating tank 15 is connected with the precision grid, and an outlet of the regulating tank 15 is connected with an inlet of the coagulation air flotation tank 1. Furthermore, the filtering precision of the precision grating is less than or equal to 1mm.
In some embodiments, the wastewater treatment system further comprises a clean water basin 5, and an inlet of the clean water basin 5 is connected with an outlet of the membrane bioreactor. The clean water tank 5 can also be used as a disinfection tank for disinfecting the water after the aerobic reaction and the mud-water separation.
In some embodiments, referring to fig. 4, the hydrolysis acidification tank 2 is provided with a biomimetic packing 14 to increase the concentration of anaerobic hydrolytic microorganisms.
In some embodiments, the wastewater treatment system described with reference to fig. 5 further comprises: sludge concentration tank 7, row's mud pipeline 8 and sludge dewaterer subassembly 9, just it is equipped with the mud export of coagulating to coagulate flotation tank 1, inorganic dull and stereotyped membrane bioreactor 4 is equipped with membrane reaction sludge outlet, coagulate the mud export with membrane reaction sludge outlet divides the adoption arrange mud pipeline 8 with the access connection of sludge concentration tank 7, sludge dewaterer subassembly 9 with the exit linkage of sludge concentration tank 7. The sludge concentration tank 7 is used for concentrating the sludge generated in the coagulation sedimentation tank and the inorganic flat membrane bioreactor 4 and conveying the concentrated sludge to the sludge dewatering component 9 for dewatering.
In some embodiments, a sludge pump is disposed on the sludge discharge pipe 8 for providing power for pumping and discharging sludge.
In some embodiments, the sludge dewatering equipment assembly 9 comprises a sludge dewatering equipment 901 and a filtrate collection container 902, wherein a water inlet of the filtrate collection container 902 is connected with a water outlet of the sludge dewatering equipment 901; specifically, the sludge dewatering machine 901 is a screw stacking machine.
In some embodiments, a filtrate pipe 10 is provided between the outlet of the filtrate collection vessel 902 and the conditioning tank 15 for discharging the removed water to the conditioning tank 15.
In some embodiments, referring to fig. 2 to fig. 3, the wastewater treatment system further includes a dosing system 11, and the dosing system 11 is configured to dose the coagulant gas flotation tank 1 with the chemicals for the coagulation reaction.
Further, the dosing system 11 is provided with at least one dosing tank 1101, and each dosing tank 1101 is provided with at least one dosing pump 1103 and at least one stirring device 1102. It should be noted that the number of the chemical adding tanks 1101 is set according to the types of chemicals added into the coagulation air flotation tank 1. The dosing pump 1103 can quantitatively add the required chemical reagents into the coagulating sedimentation tank, and the stirring device 1102 can uniformly mix the chemical reagents with the water in the coagulating sedimentation tank.
In some embodiments, specifically, the dosing system 11 comprises an alkali adding tank, a PAC adding tank, a PAM adding tank, and an intermediate tank connected in sequence. The alkali adding pool is used for adding alkali to adjust the pH value, the PAC adding pool is used for adding PAC, the PAM adding pool is used for adding PAM, and the middle pool is used for standby. Wherein, a pH meter 1104 is arranged in the alkali adding pool for controlling the pH.
In some embodiments, referring to fig. 4 and 6, the wastewater treatment system further comprises a fan assembly 12, wherein the fan assembly 12 is connected to the facultative reaction tank 3 and the inorganic flat sheet membrane bioreactor 4 respectively, and is used for aerating the facultative reaction tank 3 and the inorganic flat sheet membrane bioreactor 4 simultaneously and/or respectively.
In some embodiments, the fan assembly 12 includes a blower 1201 and an aeration pipe 1202 connected to the blower 1201, and the aeration pipe 1202 is disposed in the inorganic flat membrane bioreactor 4 and/or the facultative reaction tank 3, and oxygen-containing gas is delivered to the aeration pipe 1202 by the blower 1201 for aeration.
In some embodiments, referring to fig. 6, the wastewater treatment system further comprises a counter-flow line 16, wherein the counter-flow line 16 is connected between the facultative reaction tank 3 and the inorganic flat membrane bioreactor 4, and is used for returning water of the inorganic flat membrane bioreactor 4 to the facultative reaction tank 3, so that the organic decomposition reaction of wastewater is more completely performed. Further, the reflux ratio of the reflux reaction is 600 to 800 percent.
In some embodiments, the backflow line 16 is provided with a backflow pump 17 for powering the backflow.
In some embodiments, referring to fig. 6, the inorganic flat sheet membrane bioreactor 4 comprises:
a membrane reaction cell 401;
a submerged inorganic flat membrane module 402 disposed in the membrane reaction tank 401;
and a first pump 403, wherein the first pump 403 is communicated with the outlet of the membrane reaction tank 401 and is used for discharging water in the membrane reaction tank after passing through the submerged inorganic flat membrane module 402. Through the arrangement, the wastewater can be subjected to aerobic reaction and sludge-water separation in the immersed inorganic flat membrane module 402.
In some embodiments, the inorganic flat membrane bioreactor 4 further comprises a back-flushing pump 404 for introducing clean water to flush the submerged inorganic flat membrane module 402 to strip off suspended sludge deposited by the submerged inorganic flat membrane module 402; specifically, a cleaning pipe 405 is arranged between the clean water tank 5 and the submerged inorganic flat membrane module 402, and a back-washing pump 404 is arranged on the cleaning pipe 405 to provide pumping force to make the water in the clean water tank 5 wash the submerged inorganic flat membrane module 402.
In some embodiments, the inorganic flat sheet membrane bioreactor 4 further comprises a drug washing pump 406 for introducing a washing drug to wash the submerged inorganic flat sheet membrane module 402. Specifically, the drug washing pump 406 is disposed on the washing pipe 405.
In some embodiments, the wastewater treatment system is equipped with an intelligent control device 13, and the intelligent control device 13 includes an online parameter monitoring and information collecting system, an Artificial Intelligence (AI) decision making system for fusing a waste water treatment model of the waste transfer station and empirical parameters, and an intelligent control automatic regulating system. By the method, the automatic operation of the whole system can be realized, and the manual operation difficulty is reduced.
The method for treating wastewater by using the system is as follows:
1) Filtering the wastewater through a precision grating, and then, allowing the wastewater to enter an adjusting tank 15 to adjust the water quality to obtain wastewater to be treated;
2) Enabling the wastewater to be treated to enter a coagulation air flotation tank 1, adding an alkali liquor in an addition and subtraction tank into the coagulation air flotation tank 1 to adjust the pH value to 6-8, adding a medicine in a PAC (polyaluminium chloride) tank and a medicine in a PAM (polyacrylamide) tank into the coagulation air flotation tank 1 to perform coagulation reaction, removing floating oil to obtain first treated water, and simultaneously discharging sludge generated in the coagulation air flotation tank 1 to a sludge concentration tank 7 through a sludge discharge pipeline 8;
3) The first treated water enters a hydrolysis acidification tank 2 for hydrolysis acidification reaction to obtain second treated water;
4) Feeding the second treated water into a facultative reaction tank 3, adding acclimation bacteria, controlling the content of the activated sludge in the facultative reaction tank 3 to be 12000 to 16000mg/L, opening a fan for aeration, and maintaining the oxygen concentration of the second treated water to be 0.5mg/L to obtain third treated water;
5) And (2) allowing the third treated water to enter a membrane reaction tank 401, starting a first pump 403, allowing the third treated water to pass through an immersed inorganic flat membrane module 402 for aerobic reaction and sludge-water separation, and obtaining treated water, wherein during the reaction, the content of the third treated water activated sludge in the facultative reaction tank 3 is controlled to be 12000 to 16000mg/L, water is refluxed to a hydrolysis acidification tank 2 at the same time, the reflux ratio is 600-800%, and the generated sludge is discharged to a sludge concentration tank 7.
6) Discharging the treated water to a clean water tank 5, adding NaClO for disinfection, and finishing treatment.
7) Sludge in the sludge concentration tank 7 enters a sludge dewatering machine 901 for dewatering, filtrate generated after dewatering is discharged to a filtrate collection container 902 and then is discharged to a regulating tank 15 through a filtrate pipeline 10, and solid after dewatering of the sludge dewatering machine 901 and grid slag filtered by a precision grid are periodically cleaned;
8) After the treatment, the clean water tank 5 may be pumped into the membrane biological reaction tank, and the chemical washing pump 406 and the backwashing pump 404 are opened to clean the submerged inorganic flat membrane module 402.
Example 1
The embodiment provides a flora for treating waste water of a garbage transfer station, which comprises the following domestication steps:
taking waste water of the garbage transfer station as a culture solution, detecting the ammonia nitrogen concentration of the waste water, adding sludge of a municipal sewage plant, performing alternate culture for 5 days by adopting aerobic/anoxic, and controlling the dissolved oxygen concentration to be 1.5mg/L in an aerobic stage; then gradually reducing the aeration amount in the aerobic stage, controlling the dissolved oxygen concentration to be 1mg/L and the sludge age to be 1 to 2.5d, and simultaneously detecting NO in water 2 - Content of NO 2 - When the concentration is lower, the culture medium can be properly supplemented and maintained to 2mg/L, and cultured for 15 days at 25 ℃; further, the concentration of dissolved oxygen was controlled to 1.0mg/L, and the cells were cultured at 25 ℃ for 10 days.
Example 2
The embodiment provides a method for treating wastewater, which comprises the following steps:
1) Filtering the wastewater through a precision grating, and then, allowing the wastewater to enter an adjusting tank 15 to adjust the water quality to obtain wastewater to be treated;
2) Enabling the wastewater to be treated to enter a coagulation air flotation tank 1, adding an alkali liquor in an addition and subtraction tank into the coagulation air flotation tank 1 to adjust the pH value to 6-8, adding a medicine in a PAC (polyaluminium chloride) tank and a medicine in a PAM (polyacrylamide) tank into the coagulation air flotation tank 1 to perform coagulation reaction, removing floating oil to obtain first treated water, and simultaneously discharging sludge generated in the coagulation air flotation tank 1 to a sludge concentration tank 7 through a sludge discharge pipeline 8;
3) The first treated water enters a hydrolysis acidification tank 2 for hydrolysis acidification reaction to obtain second treated water;
4) Feeding the second treated water into a facultative reaction tank 3, adding the domesticated bacteria shown in the example 1, controlling the content of the activated sludge in the facultative reaction tank 3 to be 12000mg/L, turning on a fan for aeration, and maintaining the oxygen concentration to be 0.5mg/L to obtain third treated water;
5) And (3) allowing the third treated water to enter a membrane reaction tank 401, starting a first pump 403, allowing the third treated water to pass through an immersed inorganic flat membrane module 402 for aerobic reaction and sludge-water separation, and obtaining treated water after the aerobic reaction and the sludge-water separation, wherein during the reaction, the content of the third treated water activated sludge in the facultative reaction tank 3 is controlled to be 12000mg/L, water is refluxed to a hydrolysis acidification tank 2 at the same time, the reflux ratio is 600%, and the generated sludge is discharged to a sludge concentration tank 7.
6) Discharging the treated water to a clean water tank 5, adding NaClO for disinfection, and finishing treatment.
7) Sludge in the sludge concentration tank 7 enters a sludge dewatering machine 901 for dewatering, filtrate generated after dewatering is discharged to a filtrate collection container 902 and then is discharged to a regulating tank 15 through a filtrate pipeline 10, and solid after dewatering of the sludge dewatering machine 901 and grid slag filtered by a precision grid are periodically cleaned;
8) After the treatment, the clean water tank 5 may be pumped into the membrane biological reaction tank, and the chemical washing pump 406 and the back washing pump 404 are turned on to clean the submerged inorganic flat membrane module 402.
Example 3
1) Filtering the wastewater through a precision grid, and then, allowing the wastewater to enter an adjusting tank 15 to adjust the water quality to obtain wastewater to be treated;
2) Enabling the wastewater to be treated to enter a coagulation air flotation tank 1, adding alkali liquor in an addition and subtraction tank into the coagulation air flotation tank 1 to adjust the pH value to 6-8, adding a medicine in a PAC (polyaluminium chloride) tank and a medicine in a PAM (polyacrylamide) tank into the coagulation air flotation tank 1 to perform coagulation reaction, removing floating oil to obtain first treated water, and simultaneously discharging sludge generated by the coagulation air flotation tank 1 to a sludge concentration tank 7 through a sludge discharge pipeline 8;
3) The first treated water enters a hydrolysis acidification tank 2 for hydrolysis acidification reaction to obtain second treated water;
4) Feeding the second treated water into a facultative reaction tank 3, adding the domesticated bacteria shown in the example 1, controlling the content of the activated sludge in the facultative reaction tank 3 to be 16000mg/L, turning on a fan for aeration, and maintaining the oxygen concentration of the activated sludge to be 0.5mg/L to obtain third treated water;
5) And (2) allowing the third treated water to enter a membrane reaction tank 401, starting a first pump 403, allowing the third treated water to pass through an immersed inorganic flat membrane module 402 for aerobic reaction and sludge-water separation, and obtaining treated water after the aerobic reaction and the sludge-water separation, wherein during the reaction, the content of the third treated water activated sludge in the facultative reaction tank 3 is controlled to 16000mg/L, water is refluxed to a hydrolysis acidification tank 2 at the same time, the reflux ratio is 800%, and the generated sludge is discharged to a sludge concentration tank 7.
6) Discharging the treated water to a clean water tank 5, adding NaClO for disinfection, and finishing treatment.
7) Sludge in the sludge concentration tank 7 enters a sludge dewatering machine 901 for dewatering, filtrate generated after dewatering is discharged to a filtrate collection container 902 and then is discharged to a regulating tank 15 through a filtrate pipeline 10, and solid after dewatering of the sludge dewatering machine 901 and grid slag filtered by a precision grid are periodically cleaned;
8) After the treatment, the clean water tank 5 may be pumped into the membrane biological reaction tank, and the chemical washing pump 406 and the backwashing pump 404 are opened to clean the submerged inorganic flat membrane module 402.
Example 4
1) Filtering the wastewater through a precision grating, and then, allowing the wastewater to enter an adjusting tank 15 to adjust the water quality to obtain wastewater to be treated;
2) The wastewater to be treated enters a coagulation air flotation tank 1, alkali liquor in an addition and subtraction tank is added into the coagulation air flotation tank 1 to adjust the pH value to 7.5, a medicine added into a PAC tank and a medicine added into a PAM tank are added into the coagulation air flotation tank 1 to carry out coagulation reaction, floating oil is removed to obtain first treated water, and meanwhile sludge generated by the coagulation air flotation tank 1 is discharged to a sludge concentration tank 7 through a sludge discharge pipeline 8;
3) The first treated water enters a hydrolytic acidification tank 2 to carry out hydrolytic acidification reaction to obtain second treated water;
4) Feeding the second treated water into a facultative reaction tank 3, adding the domesticated bacteria shown in the example 1, controlling the content of the activated sludge in the facultative reaction tank 3 to be 15000mg/L, turning on a fan for aeration, and maintaining the oxygen concentration to be 0.5mg/L to obtain third treated water;
5) And (3) feeding the third treated water into a membrane reaction tank 401, starting a first pump 403, carrying out aerobic reaction and sludge-water separation on the third treated water through an immersed inorganic flat membrane module 402, and obtaining treated water after the aerobic reaction and the sludge-water separation, wherein during the reaction, the content of activated sludge in the third treated water in the facultative reaction tank 3 is controlled to 15000mg/L, and meanwhile, water flows back to the hydrolysis acidification tank 2, the reflux ratio is 700%, and the generated sludge is discharged to a sludge concentration tank 7.
6) Discharging the treated water to a clean water tank 5, adding NaClO for disinfection, and finishing treatment.
7) Sludge in the sludge concentration tank 7 enters a sludge dewatering machine 901 for dewatering, filtrate generated after dewatering is discharged to a filtrate collection container 902 and then is discharged to a regulating tank 15 through a filtrate pipeline 10, and solid after dewatering of the sludge dewatering machine 901 and grid slag filtered by a precision grid are periodically cleaned;
8) After the treatment, the clean water tank 5 may be pumped into the membrane biological reaction tank, and the chemical washing pump 406 and the backwashing pump 404 are opened to clean the submerged inorganic flat membrane module 402.
The results are shown in table 1:
through the detection, various pollution indexes of the water treated by the method are obviously reduced.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A method for treating wastewater, comprising the steps of:
s1, providing wastewater to be treated;
s2, adding a coagulation reactant into the wastewater to be treated to perform coagulation reaction, and removing floating oil and suspended matters to obtain first treated water;
s3, performing hydrolysis acidification reaction on the first treated water to obtain second treated water;
s4, adding domesticated bacteria into the second treated water, and reacting under a facultative anaerobic condition to obtain third treated water, wherein the domesticated bacteria can perform a short-cut nitrification and denitrification process under the facultative anaerobic condition;
and S5, carrying out aerobic reaction and mud-water separation on the third treated water by adopting an inorganic membrane bioreactor to obtain treated water.
2. The wastewater treatment method according to claim 1, wherein the step S1 comprises:
filtering the wastewater and then tempering to obtain the wastewater to be treated; and/or the presence of a gas in the atmosphere,
after the step S5, the method further includes:
and S6, discharging the treated water after disinfection.
3. The wastewater treatment method according to claim 1, wherein the pH of the wastewater to be treated is 6 to 8; and/or the presence of a gas in the gas,
the coagulation reactant comprises a coagulant and a coagulant aid.
4. The method for treating wastewater according to claim 1, wherein the facultative condition is a condition in which the dissolved oxygen concentration is 0.5 mg/L; and/or the presence of a gas in the gas,
12000 to 16000mg/L of activated sludge is contained in the second treated water; and/or the presence of a gas in the gas,
the acclimatization step of the acclimatized flora comprises the following steps:
taking the wastewater to be treated as a culture solution, adding sludge, and alternately culturing for 5 days by adopting aerobic and anaerobic processes, wherein the dissolved oxygen concentration is controlled to be 1-2mg/L in the aerobic stage, and the sludge age of the sludge is controlled to be 1-2.5 days;
gradually reducing the dissolved oxygen concentration until the dissolved oxygen concentration is 0.5 to 1.5mg/L, and simultaneously controlling NO 2 - Culturing at 2mg/L at 25 deg.C for 15 days;
controlling the dissolved oxygen concentration to be 0.5-1.0 mg/L, and culturing for 10 days at 25 ℃ to obtain the culture medium.
5. The wastewater treatment method according to claim 1, wherein the inorganic membrane bioreactor comprises a submerged inorganic flat membrane module, and the third treated water is treated by the submerged inorganic flat membrane module to obtain the treated water after the aerobic reaction and the mud-water separation, wherein the material of the submerged inorganic flat membrane module comprises a main material and a super-hydrophilic material loaded on the surface of the main material, and the main material comprises cordierite and Al 2 O 3 (ii) a And/or the presence of a gas in the gas,
the third treated water contains 12000 to 16000mg/L of activated sludge.
6. A wastewater treatment system, comprising:
the coagulation air flotation tank is used for performing coagulation reaction on the wastewater and removing floating oil and suspended matters in the wastewater;
a hydrolysis acidification tank, which is used for carrying out hydrolysis acidification reaction on the wastewater which is subjected to coagulation reaction and is removed with the floating oil and the suspended matters;
the facultative reaction tank is used for carrying out reaction under the facultative condition on the wastewater subjected to the hydrolytic acidification reaction, and the reaction comprises a short-cut nitrification and denitrification reaction and a decomposition reaction of C-containing organic matters; and the number of the first and second groups,
and the inorganic flat membrane bioreactor is used for carrying out aerobic reaction and sludge-water separation on the wastewater subjected to the decomposition reaction under the facultative condition.
7. The wastewater treatment system of claim 6, further comprising: the coagulation air flotation tank, the hydrolysis acidification tank, the facultative reaction tank and the inorganic flat membrane bioreactor are sequentially communicated through the downstream pipeline.
8. The wastewater treatment system of claim 6, further comprising:
a counter-flow pipeline connected between the facultative reaction tank and the inorganic flat sheet membrane bioreactor for returning water in the inorganic flat sheet membrane bioreactor to the facultative reaction tank; and/or the presence of a gas in the gas,
the inlet of the adjusting tank is connected with the precise grid, and the outlet of the adjusting tank is connected with the inlet of the coagulation air flotation tank; and/or the presence of a gas in the atmosphere,
an inlet of the clean water tank is connected with an outlet of the inorganic flat membrane bioreactor; and/or the presence of a gas in the gas,
the device comprises a sludge concentration tank, a sludge discharge pipeline and a sludge dewatering machine assembly, wherein the coagulation air flotation tank is provided with a coagulation sludge outlet, the inorganic flat membrane bioreactor is provided with a membrane reaction sludge outlet, the coagulation sludge outlet and the membrane reaction sludge outlet are respectively connected with an inlet of the sludge concentration tank through the sludge discharge pipeline, and the sludge dewatering machine assembly is connected with an outlet of the sludge concentration tank; and/or the presence of a gas in the gas,
the dosing system is used for dosing the coagulation air flotation tank to perform the coagulation reaction; and/or the presence of a gas in the atmosphere,
and the fan assembly is respectively connected with the facultative reaction tank and the inorganic flat membrane bioreactor and is used for simultaneously and/or respectively carrying out oxygen aeration on the facultative reaction tank and the inorganic flat membrane bioreactor.
9. The wastewater treatment system of claim 7, wherein the inorganic flat sheet membrane bioreactor comprises:
a membrane reaction tank;
an immersed inorganic flat membrane component arranged in the membrane reaction tank; and the number of the first and second groups,
and the first pump is communicated with the outlet of the membrane reaction tank and is used for discharging the water in the membrane reaction tank after passing through the immersed inorganic flat membrane module.
10. The wastewater treatment system of claim 9, wherein the inorganic flat sheet membrane bioreactor further comprises:
the backwashing pump is used for introducing clean water to flush the immersed inorganic flat membrane component so as to strip suspended sludge deposited on the immersed inorganic flat membrane component; and/or the presence of a gas in the atmosphere,
and the medicine washing pump is used for introducing washing medicines to wash the immersed inorganic flat membrane component.
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| CN111762970A (en) * | 2020-07-06 | 2020-10-13 | 武汉环联环境工程有限公司 | Method for treating leachate of garbage transfer station |
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Application publication date: 20230113 |