CN115340255A - Advanced treatment system and method based on surface water type III water quality standard - Google Patents

Advanced treatment system and method based on surface water type III water quality standard Download PDF

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Publication number
CN115340255A
CN115340255A CN202210891505.6A CN202210891505A CN115340255A CN 115340255 A CN115340255 A CN 115340255A CN 202210891505 A CN202210891505 A CN 202210891505A CN 115340255 A CN115340255 A CN 115340255A
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sedimentation tank
tank
mbbr
water
magnetic
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孙旻
李赛超
王剑飞
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Huatian Engineering and Technology Corp MCC
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Huatian Engineering and Technology Corp MCC
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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
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • C02F2101/30—Organic compounds
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/18—PO4-P
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses an advanced treatment system and method based on surface water III-class water quality standard. The system comprises an MBBR tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank added with powdered activated carbon which are connected in sequence; the front end of the magnetic coagulation sedimentation tank is provided with a mixed contact area of powdered activated carbon and a magnetic powder adding device; the magnetic coagulation sedimentation tank comprises a magnetic coagulation sedimentation tank body and a magnetic coagulation sedimentation tank body, wherein the magnetic coagulation sedimentation tank body is sequentially communicated with the magnetic coagulation sedimentation tank body: a mixing contact area, a mixing area, a magnetic loading area, a flocculation area and a sedimentation area of the powdered activated carbon. According to the invention, through the combination of an MBBR system, a secondary sedimentation tank and a magnetic coagulation system for adding powdered activated carbon, the COD (chemical oxygen demand) of effluent treated by a combined process system can reach below 20mg/L, ammonia nitrogen can reach below 1mg/L, SS (suspended substance) can reach below 5mg/L, and TP (total transfer point) can reach below 0.1 mg/L.

Description

Advanced treatment system and method based on surface water type III water quality standard
Technical Field
The invention relates to the field of sewage treatment, and particularly designs an advanced treatment system and method for upgrading low-concentration industrial-pollution-containing wastewater to a surface III-class water standard.
Background
At present, the common treatment processes of town sewage plants comprise: AAO/oxidation ditch/SBR/MBBR + advanced treatment process and MBR process. When the sewage plant generally adopts the various processes to treat the municipal sewage, the effluent of the sewage plant can be ensured to reach the first-class A discharge standard, but is difficult to reach the higher similar surface IV discharge standard or the higher discharge standard.
In recent years, with the increasing protection of the water environment in China, higher requirements are put forward on the water quality standard of the surface water environment. For slightly polluted water, namely slightly polluted natural water, physical, chemical and microbial indexes of the slightly polluted water can not meet the requirements of the environmental quality standard of surface water (GB 3838-2002), and most of the slightly polluted water relates to NH 3 Trace contamination by N and COD. Because the pollution concentration is not high, the water quality index is generally lower than the limit value of the first-class B or first-class A standard in the pollutant discharge standard of urban sewage treatment plants (GB 18918-2002), so the original process can not meet the discharge requirement of the surface water III standard, and particularly, the sewage containing industrial wastewater is difficult to treat, so the research and development of the deep treatment system with reliable operation has important practical significance.
Disclosure of Invention
In view of the problems of the prior art, a first object of the present invention is to provide an advanced treatment system and method that can meet the class iii water standard of surface water.
In order to achieve the purpose, the invention provides an advanced treatment system for upgrading micro-polluted water containing industrial polluted wastewater to a surface III-class water standard, which comprises an MBBR tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank added with powdered activated carbon, wherein the MBBR tank, the secondary sedimentation tank and the magnetic coagulation sedimentation tank are connected in sequence;
the front end of the magnetic coagulation sedimentation tank is provided with a mixed contact area of powdered activated carbon and a magnetic powder feeding device.
Further, the magnetic coagulation sedimentation tank comprises: a mixing contact area, a mixing area, a magnetic loading area, a flocculation area and a sedimentation area of the powdered activated carbon.
Furthermore, a micropore aeration disc is arranged at the bottom of the MBBR tank; and the tail end of the MBBR tank is provided with an ammonia nitrogen rapid tester.
Further, a mixed flocculation area and a reuse water pump are arranged in the secondary sedimentation tank; and water of the secondary sedimentation tank system returns to the MBBR tank through a reuse water pump.
The advanced treatment method for upgrading low-concentration polluted wastewater to the earth surface III-class water standard comprises the following steps of:
(1) Lifting low-concentration wastewater containing industrial sewage to an MBBR tank, and aerating COD and NH of the sewage in the tank by using MBBR filler and bottom micropores 3 -N is processed;
(2) The effluent of the MBBR tank enters a secondary sedimentation tank, the front end of the secondary sedimentation tank is provided with a mixed flocculation area, and PAC and PAM are added to accelerate the sedimentation of flocculates; meanwhile, the waste of the powder active carbon due to adsorption of flocculate can be avoided;
(3) The effluent of the secondary sedimentation tank enters a magnetic coagulation sedimentation tank, and powdered activated carbon is added at the front end of the magnetic coagulation sedimentation tank to adsorb COD which is difficult to degrade in the industrial wastewater;
(4) Adding magnetic powder into the wastewater added with the powdered activated carbon to enlarge flocs and accelerate the removal of COD and TP precipitates.
The step 2 also comprises the following steps: and (3) detecting the ammonia nitrogen value in the wastewater by using an ammonia nitrogen determinator at the tail end of the MBBR tank in real time, stopping adding PAC and PAM medicaments when the ammonia nitrogen value exceeds 1mg/L, and refluxing the nitrifying liquid to the sludge in the secondary sedimentation tank, wherein the reflux ratio is 30%.
According to the invention, through the combination of an MBBR system, a secondary sedimentation tank and a magnetic coagulation system for adding powdered activated carbon, the COD of the effluent treated by the combined process system can reach below 20mg/L, the ammonia nitrogen can reach below 1mg/L, the SS can reach below 5mg/L, and the TP can reach below 0.1 mg/L.
Drawings
FIG. 1 is a process flow of example 1 of the present invention.
FIG. 2 is a process flow diagram of example 2 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The invention will now be further described with reference to the following examples and figure 2.
The wastewater (sewage) referred by the patent refers to wastewater and sewage generated in the industries of agriculture, forestry, animal husbandry, fishery, mining, manufacturing, medical sanitation, environmental sanitation and the like classified according to the national economic industry (GB/T4754-2017), and also comprises domestic sewage generated in the lives of urban and rural residents and the like.
The water quality limits of class III of the water quality standard of surface water are as follows:
name of contaminant CODcr BOD5 NH3-N TP
Concentration (mg/L) 20.0 4.0 1.0 0.2
The deep treatment system capable of achieving the III-class water standard of surface water comprises an MBBR (moving bed biofilm reactor), a secondary sedimentation tank and a magnetic coagulation sedimentation tank; the MBBR process system mainly removes various pollutants by taking a biological film which is added on the surface of suspended filler in a reactor and grows in an attached manner as a main component, the effluent of the MBBR process system is led to a secondary sedimentation tank to carry out primary sedimentation on suspended matters, and nitrifying liquid backflow is carried out on sludge in the secondary sedimentation tank, wherein the backflow ratio is 30%; and leading the effluent of the secondary sedimentation tank to a magnetic coagulation tank, and directly discharging the tail water subjected to magnetic coagulation treatment or recycling the tail water as reclaimed water.
A biological membrane which takes microorganisms as a main body and is attached and grown on the surface of a suspended filler is added into a reactor of the MBBR system, intercepting screens are arranged at water inlets and water outlets of the MBBR tank, and an aeration system is arranged at the bottom of the MBBR tank;
the secondary sedimentation tank system comprises a sedimentation system and a sludge backflow system; the sludge flows back to the water inlet channel of the MBBR system;
the magnetic coagulation system comprises a mixing system, a dosing system, a precipitation system, a sludge backflow system, a magnetic recovery system and a residual sludge conveying system; the reaction zone of the magnetic coagulation system mainly comprises a coagulation reaction zone, a magnetic loading zone, a flocculation reaction zone and a precipitation zone;
the process comprises the following steps:
1) MBBR treatment step
The sewage to be treated enters the MBBR system after being pretreated, after being domesticated and cultured, the effective membrane area provided by the suspended filler is enriched with growing autotrophic aerobic type nitrifying bacteria or heterotrophic aerobic type bacteria, and NH in the sewage is effectively degraded 3 N and various organic pollutants, and the MBBR tank is fluidized uniformly by a bottom aeration system;
2) Secondary sedimentation tank treatment step
Sewage after the MBBR system handles gets into two heavy ponds, deposits to scraping mud district through gravity, is collected the back by the mud scraper, and partly through mud return system return to the MBBR system, can strengthen the MBBR system and get rid of COD and NH 3 -N and reducing the amount of carbon source added due to low concentration of contaminated water; the other part of sludge is taken as a residual sludge conveying system discharge system, and SS and TP in part of the sewage are removed;
3) Magnetic coagulation treatment step
The sewage after primary sedimentation in the secondary sedimentation tank firstly enters a coagulation reaction zone, a flocculating agent added by a dosing system is quickly and fully mixed with influent sewage and then enters a magnetic loading zone, added magnetic powder is quickly and uniformly dispersed into the sewage and then enters a flocculation reaction zone, the sewage enters the sedimentation zone under the action of a coagulant aid PAM, clear water is discharged from a clarification zone of the sedimentation zone through a water outlet tank to a system, the flocculating agent sinks to a mud bucket zone, the flocculating agent is collected by a mud scraper and then is sent to a magnetic separator, the sludge after magnetic powder separation is used as residual sludge and is discharged from a residual sludge conveying system, SS and TP in the sewage are finally and effectively removed, and the discharged water can be directly discharged or used as reclaimed water for recycling.
Yet another embodiment of the invention: an advanced treatment system which can enable sewage containing industrial wastewater to reach the III-class water standard of surface water on the basis of reducing the adding amount of powdered activated carbon comprises an MBBR, a secondary sedimentation tank and a magnetic coagulation sedimentation tank; the MBBR process system mainly removes various pollutants by taking a biological film which is added on the surface of suspended filler in a reactor and grows by adhesion, and effluent of the MBBR process system is led to a secondary sedimentation tank to carry out primary sedimentation on suspended matters; and leading the effluent of the secondary sedimentation tank to a magnetic coagulation tank, and directly discharging the tail water subjected to the magnetic coagulation treatment or recycling the tail water as reclaimed water.
A biofilm attached and grown on the surface of a suspended filler taking microorganisms as a main body is thrown into a reactor of the MBBR system, intercepting screens are arranged at water inlets and water outlets of the MBBR tank, and an aeration system is arranged at the bottom of the MBBR tank;
the secondary sedimentation tank system comprises a mixed flocculation system and a sedimentation system;
the magnetic coagulation system comprises a powdered activated carbon mixing contact system, a mixing system, a dosing system, a precipitation system, a sludge backflow system, a magnetic recovery system and a residual sludge conveying system; the reaction zone of the magnetic coagulation system mainly comprises a powdered activated carbon mixing contact zone, a coagulation reaction zone, a magnetic loading zone, a flocculation reaction zone and a precipitation zone;
the process comprises the following steps:
1) MBBR treatment step
The sewage to be treated enters the MBBR system after being pretreated, after being domesticated and cultured, the effective membrane area provided by the suspended filler is enriched with growing autotrophic aerobic type nitrifying bacteria or heterotrophic aerobic type bacteria, and NH in the sewage is effectively degraded 3 N and various organic pollutants, and the MBBR tank is fluidized uniformly by a bottom aeration system;
2) Secondary sedimentation tank treatment step
The sewage treated by the MBBR system enters a secondary sedimentation tank, a flocculating agent added by a medicine adding system is rapidly mixed with the sewage and then enters a sedimentation tank, formed large floccules are deposited to a mud scraping area through gravity, the large floccules are collected by a mud scraper and then are used as a residual sludge conveying system to be discharged out of the system, and a part of TP in the sewage is removed and meanwhile a fallen biomembrane is also removed;
3) Magnetic coagulation treatment step
The sewage after primary sedimentation in the secondary sedimentation tank firstly enters a powdered activated carbon mixed contact tank to adsorb SS and macromolecular organic matters in the sewage, then enters a coagulation reaction zone, a flocculating agent added by a dosing system is quickly and fully mixed with influent sewage and then enters a magnetic loading zone, the added magnetic powder is quickly and uniformly dispersed into the sewage and then enters a flocculation reaction zone, the sewage enters a sedimentation zone under the action of a coagulant aid PAM, clear water passes through a water outlet tank in a clarification zone of the sedimentation zone and is discharged out of a system, the flocculating agent is gravitationally sunk to a mud bucket zone and is collected by a mud scraper and then is sent to a magnetic separator, the sludge after magnetic powder separation is taken as residual sludge and is discharged out of the system through a residual sludge conveying system, COD, SS and TP in the sewage are finally and effectively removed, and the effluent can be directly discharged out or recycled as reclaimed water.
Examples of the invention
Taking the mixed water of the tail water of the sewage treatment plant containing the organic chemical industry industrial wastewater of the manufacturing industry and the initial rainwater as an example
As shown in figures 1 and 2, the advanced treatment system capable of achieving the III-class water standard of surface water consists of an MBBR system, a secondary sedimentation tank and a magnetic coagulation system added with powdered activated carbon.
The water temperature of raw water is 5-20 ℃, the BOD5 concentration of the water is 10-30 mg/L, the CODcr concentration is 30-60 mg/L, the NH3-N concentration is 5-15 mg/L, the TP concentration is 0.3-0.5 mg/L, the SS concentration is 20-50 mg/L, and the pH value is 6-9 mg/L.
Raw water enters an MBBR tank of an MBBR system after being precipitated by a primary sedimentation pond, the MBBR process in the embodiment adopts an aerobic process, suspended fillers are added into a reaction zone, the filling rate of the added suspended fillers is 40-50%, the effective specific surface area of the suspended fillers is 800m < 2 >/m < 3 >, the specific gravity of the suspended fillers before film hanging is 0.94-0.97 g/cm < 3 >, the hydraulic retention time is 3.2h, the COD (chemical oxygen demand) of effluent can be lower than 30mg/L, and the NH3-N (ammonia-nitrogen) of the effluent can be lower than 0.5mg/L.
The effluent of the MBBR tank enters a secondary sedimentation tank, and the secondary sedimentation tank is provided with a mixed flocculation area and a sedimentation area; wherein the retention time of the coagulation reaction zone is 2min, and the rotating speed of the stirrer is 32-64 rpm; the retention time of the flocculation zone is 10min, and the rotating speed of the stirrer is 18-38 rpm; the coagulant is PAC, the dosage is 10-50 mg/L, the coagulant aid is PAM, the dosage is 0.1-0.5 mg/L, and the SS of the effluent can be lower than 20mg/L.
And the effluent of the secondary sedimentation tank enters a magnetic coagulation system added with powdered activated carbon, the retention time of the powdered activated carbon mixing contact tank is 20min, the retention time of a coagulation reaction zone is 2.5min, the rotating speed of a stirrer is 32-64 rpm, the retention time of a magnetic loading zone is 2.5min, the rotating speed of the stirrer is 10-50 rpm, the retention time of a flocculation reaction zone is 5min, the rotating speed of the stirrer is 18-38 rpm, a coagulant is added and is PAC, the adding amount is 10-100 mg/L, a coagulant aid is PAM, the adding amount is 0.1-1.5 mg/L, and the daily supplementary magnetic powder amount is 1-10 mg/L. The sedimentation zone adopts the pipe chute to deposit, and the bottom sets up mud return-flow system and excess sludge discharge system, and magnetic in the excess sludge is retrieved cyclic utilization through magnetic recovery unit. Through the adsorption of the powdered activated carbon and the precipitation of magnetic coagulation, the COD of the effluent can be less than 20mg/L, the TP of the effluent can be less than 0.2mg/L, and the SS of the effluent can be less than 5mg/L.
So far, all the indexes of the discharged water meet the III-class water quality standard of surface water.
The present invention is described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Many other changes and modifications may be made without departing from the spirit and scope of the invention and should be considered as within the scope of the invention.
The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (7)

1. An advanced treatment system based on surface water III-class water quality standards is characterized in that the advanced treatment system comprises an MBBR tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank added with powdered activated carbon, which are connected in sequence;
the front end of the magnetic coagulation sedimentation tank is provided with a mixed contact area of powdered activated carbon and a magnetic powder feeding device.
2. The advanced treatment system based on the III-class water quality standard of the surface water as claimed in claim 1, wherein the magnetic coagulation sedimentation tank comprises: a mixing contact area, a mixing area, a magnetic loading area, a flocculation area and a sedimentation area of the powdered activated carbon.
3. The advanced treatment system based on the III-class water quality standard of the surface water as claimed in claim 1, wherein a microporous aeration disc is arranged at the bottom of the MBBR tank; and the tail end of the MBBR tank is provided with an ammonia nitrogen rapid tester.
4. The advanced treatment system for upgrading micro-polluted water containing industrial polluted wastewater to the ground surface class III water standard according to claim 1, wherein a mixed flocculation area and a reuse water pump are arranged in the secondary sedimentation tank; and water in the secondary sedimentation tank system returns to the MBBR tank through a recycling water pump.
5. The advanced treatment system based on the class-III water quality standard of the surface water as claimed in claim 1, wherein the secondary sedimentation tank system comprises a mixing flocculation zone and a sedimentation zone.
6. An advanced treatment method based on III-class water quality standards of surface water is characterized by comprising the following steps:
(1) Lifting low-concentration wastewater containing industrial sewage to an MBBR tank, and aerating COD and NH of the sewage in the tank by using MBBR filler and bottom micropores 3 -N is processed;
(2) The effluent of the MBBR tank enters a secondary sedimentation tank, the front end of the secondary sedimentation tank is provided with a mixed flocculation area, and PAC and PAM are added to accelerate the sedimentation of flocculate;
(3) The effluent of the secondary sedimentation tank enters a magnetic coagulation sedimentation tank, and powdered activated carbon is added at the front end of the magnetic coagulation sedimentation tank to adsorb COD which is difficult to degrade in the industrial wastewater;
(4) Adding magnetic powder into the wastewater added with the powdered activated carbon to enlarge flocs so as to accelerate the removal of COD and TP precipitates.
7. The method of claim 6, wherein said step 2 is preceded by the step of: and (3) detecting the ammonia nitrogen value in the wastewater by using an ammonia nitrogen determinator at the tail end of the MBBR tank in real time, stopping adding PAC and PAM medicaments when the ammonia nitrogen value exceeds 1mg/L, and refluxing the nitrifying liquid to the sludge in the secondary sedimentation tank, wherein the reflux ratio is 30%.
CN202210891505.6A 2022-07-27 2022-07-27 Advanced treatment system and method based on surface water type III water quality standard Pending CN115340255A (en)

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Citations (8)

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