CN114163072A - Reclaimed water recycling system capable of being switched to adapt to different recycling requirements and process flow thereof - Google Patents

Reclaimed water recycling system capable of being switched to adapt to different recycling requirements and process flow thereof Download PDF

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Publication number
CN114163072A
CN114163072A CN202111419733.5A CN202111419733A CN114163072A CN 114163072 A CN114163072 A CN 114163072A CN 202111419733 A CN202111419733 A CN 202111419733A CN 114163072 A CN114163072 A CN 114163072A
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water
biological filter
tank
mbr membrane
pipeline
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CN114163072B (en
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朱勇强
蓝昭鸿
徐梦雅
张战军
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Shanghai Aoge Environmental Technology Co ltd
Shanghai Institute of Technology
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Shanghai Aoge Environmental Technology Co ltd
Shanghai Institute of Technology
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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
    • C02F1/001—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
    • C02F1/28—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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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
    • C02F2209/02—Temperature
    • 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
    • C02F2209/03—Pressure
    • 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
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • 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
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • 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

Abstract

The invention relates to the technical field of sewage treatment, in particular to a reclaimed water recycling system capable of being switched to adapt to different recycling requirements and a process flow thereof; the reclaimed water recycling system capable of being switched to adapt to different recycling requirements comprises an MBR membrane tank, a nanofiltration device, a biological filter, a reclaimed water recycling barrel, a clear water discharge barrel, an anaerobic tower, a blower and a filter press; comprises a water delivery pipeline, a return pipeline, an aeration pipeline, a back flushing pipeline and a sludge pipeline. The invention achieves different reclaimed water recycling effects by switching the equipment sequence of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank' to adapt to the requirement of recycled water of a specific enterprise at different stages, achieves the purposes of prolonging the service life of each equipment and saving energy and consumption by flexibly combining the equipment, and avoids secondary pollution by treating residual sludge, concentrated water and water which is not well treated by the equipment sequence of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank'.

Description

Reclaimed water recycling system capable of being switched to adapt to different recycling requirements and process flow thereof
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a reclaimed water recycling system capable of being switched to adapt to different recycling requirements and a process flow thereof.
Background
In industrial production, a large amount of waste water containing various pollution factors is generated. The organic pollutants are the pollution factors which account for a large amount in the chemical effluent waste water. The organic pollutants and other pollution factors can be directly discharged into municipal pipe networks and natural water bodies along with untreated or unqualified treated wastewater, and then cause pollution to town drainage pipelines, rivers, lakes and underground water bodies, and threaten the ecological environment in water areas to different degrees; the amount of wastewater discharged by chemical industry is huge and under the severe water resource shortage condition of China, the reuse of reclaimed water in the wastewater discharged by chemical industry is very necessary. The reclaimed water has different water quality standards and water quality requirements according to different purposes. All countries in the world set water quality standards considering production improvement and environmental protection according to the technical level and economic conditions in China. China formally constructs a reclaimed water reuse requirement system from the beginning of the century, wherein the reclaimed water reuse requirement system is commonly used in the water quality of industrial water for urban sewage recycling (GB/T19923) 2005, the water quality of a heating and air-conditioning system (GB/T29044) 2012 and the like. These standards have all made certain specifications for the reuse of recycled water. After biochemical treatment to advanced treatment, the chemical wastewater is treated again at the tail end of the daily chemical wastewater by using a conventional membrane method, although the chemical wastewater can meet the recycling requirements of national standards and enterprises. However, the equipment which only uses the membrane treatment method has large replacement cost, daily consumed chemicals, electric power and labor cost, and the pollutants in the concentrated water intercepted by the membrane are not really treated, but are enriched and then flow back to the front end of the whole sewage treatment system, so that the system load is still increased in fact.
In the prior art, Chinese patent CN201410334805.X discloses a reclaimed water recycling system based on a membrane bioreactor to realize industrial reclaimed water recycling, and the method uses a hollow fiber ultrafiltration membrane, a Membrane Bioreactor (MBR), a reverse osmosis membrane RO or a nanofiltration NF membrane and the like to make reclaimed water reach the standard according to the quality of inlet water of the recycling system, so that the method has a certain treatment effect reference value, however, the research is mainly the use of membrane equipment, and the daily equipment replacement and maintenance cost is higher. Chinese patent CN202010813150.X discloses a system and a method for reusing indoor reclaimed water in a public building, which aims at utilizing the cascade of water resources, wherein the method has a certain energy-saving effect reference value through purifying from a high layer to a low layer of the building step by step, however, the research does not consider a detailed emergency plan when the treatment is unqualified, so that unsafe factors in the actual production process are increased. The Chinese patent CN201921635782.O discloses a reclaimed water recycling system for petrochemical wastewater, which is used for recycling reclaimed water from the petrochemical wastewater, and the method adopts a modular design to flexibly combine and communicate various parts of a pretreatment system and the reclaimed water recycling system through a water pump and a pipeline, fully considers the conditions of normal treatment of outsourcing, backwashing and backflow, has a certain flow reference value, however, the research cannot meet the recycling requirements of different recycling standards through adjustment in the process of the research, and has no universal applicability. Therefore, the reclaimed water recycling process has great practical application significance, saves energy and reduces consumption, and can be flexibly adjusted to adapt to different recycling requirements.
Disclosure of Invention
The purpose of recycling the reclaimed water more economically and efficiently is achieved in order to solve the defects that the existing reclaimed water recycling process has poor treatment effect, high energy consumption and high equipment maintenance cost and cannot adapt to local policies or internal requirement changes of enterprises; the invention provides a reclaimed water recycling system capable of being switched to adapt to different recycling requirements and a process flow thereof.
The invention relates to a reclaimed water recycling system which can be switched to adapt to different recycling requirements and comprises an MBR membrane tank, a nanofiltration device, a biological filter, a reclaimed water recycling barrel, a clear water discharge barrel, an anaerobic tower, a blower and a filter press; also comprises a water delivery pipeline, a return pipeline, an aeration pipeline, a back flushing pipeline and a sludge pipeline. All the devices are communicated through pipelines, pumps and valves. The invention can achieve different reclaimed water recycling effects by switching the equipment sequence of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank' to adapt to the requirement of recycled water of a specific enterprise at different stages, achieves the purposes of prolonging the service life of each equipment and saving energy and consumption by flexibly combining the equipment, and avoids secondary pollution by treating residual sludge, concentrated water and water which is not well treated by the equipment sequence of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank'.
The invention combines the conventional treatment equipment and the biological treatment equipment, thereby prolonging the service life of the membrane equipment, reducing the burden of the biochemical treatment equipment and simultaneously generating better treatment effect. The process of the 'dual-mode bioreactor' based on the optimization of the biofilter is added to the conventional 'membrane treatment method'. According to the recycling requirements executed in different places or the internal requirements of enterprises can be changed by switching the equipment sequence (MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank) to adapt to different recycling requirements without additionally adding civil engineering equipment and modifying pipelines.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a reclaimed water recycling system capable of being switched to adapt to different recycling requirements, which is used for a reclaimed water recycling process flow and comprises an MBR (membrane bioreactor), a biological filter, a nanofiltration device, a blower, a filter press, an anaerobic tower, a reclaimed water recycling barrel and a clear water discharge barrel; the device also comprises a water conveying pipeline, a return pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline;
the anaerobic tower is connected with the MBR membrane tank through a water pipeline; the MBR membrane tank is connected with a nanofiltration device and a biological filter tank through water pipelines, the nanofiltration device is connected with the biological filter tank through a water pipeline, and the biological filter tank is connected with a reclaimed water recycling barrel and a clean water discharge barrel through a water pipeline;
the biological filter and the nanofiltration equipment are connected with the anaerobic tower through a return pipeline;
the air blower is connected with the MBR membrane tank and the biological filter tank through an aeration pipeline;
the air blower is connected with the biological filter through a backflushing pipeline; the clear water discharge barrel is connected with the biological filter through a backflushing pipeline;
the MBR membrane tank and the biological filter tank are connected with a filter press through a sludge pipeline.
In one embodiment of the invention, the devices are communicated with each other through pipelines, pumps and valves.
In one embodiment of the invention, the reclaimed water recycling barrel is connected with a cooling water system through a water pipeline, and the clear water discharging barrel is connected with a municipal pipe network through a water pipeline.
In one embodiment of the invention, the water duct comprises in particular the following ducts:
1) the raw wastewater is conveyed to an anaerobic tower pipeline;
2) a pipeline from the anaerobic tower to the MBR membrane tank;
3) sequentially switching and selecting equipment from the MBR membrane tank to a biological filter tank pipeline or from the MBR membrane tank to nanofiltration equipment and then to the biological filter tank pipeline according to different recycling standard vertebra;
4) the qualified water is treated by the equipment of the MBR membrane tank → the biological filter tank or the equipment of the MBR membrane tank → the nanofiltration equipment → the biological filter tank in sequence and is sent to a reclaimed water recycling barrel pipeline from the biological filter tank;
5) the qualified water is treated by the equipment of the MBR membrane tank → the biological filter tank or the equipment of the MBR membrane tank → the nanofiltration equipment → the biological filter tank in sequence from the biological filter tank to a clear water discharge barrel pipeline;
6) a water replenishing pipeline from the reclaimed water recycling barrel to the cooling water system;
7) and the clear water is discharged from the barrel to a municipal pipe network pipeline.
In one embodiment of the invention, the return line comprises in particular the following lines:
1) the unqualified water is sequentially treated by the equipment of the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank, and the water flows from the biological filter tank to an anaerobic tower pipeline;
2) and the concentrated water produced by the nanofiltration equipment is led to an anaerobic tower pipeline from the biological filter.
In one embodiment of the invention, the aeration conduit comprises in particular the following conduits:
1) a pipeline from an air blower to the MBR membrane tank;
2) from the blower to the biological filter pipeline.
In one embodiment of the invention, the backflush line comprises in particular the following lines:
1) back flushing the gas pipeline: the air blower is connected to the biological filter pipeline, and the air blower can bypass out of the aeration pipeline at the front end of the biological filter;
2) a backwash water pipe: and the clear water is discharged from the barrel to the biological filter pipeline.
In one embodiment of the invention, the sludge pipeline specifically comprises the following pipelines:
1) from the MBR membrane tank to the filter press pipeline;
2) from the biological filter to a filter press pipeline;
3) from the filter press to a sludge outward transport pipeline.
In one embodiment of the invention, 3 groups of membrane piles are arranged in the MBR membrane pool, two groups of membrane piles are used for one group of membrane piles, and a self-priming pump with negative pressure is arranged;
the biological filter tank is equipment developed by Shanghai Egge environmental protection company, consists of 7 reaction tanks, and is provided with a reflux pump and 7 online dissolved oxygen measuring instruments; a fixed bed and a fluidized bed are arranged, and the aerobic mode and the anaerobic mode run simultaneously; the dissolved oxygen of each reaction tank in the biological filter is adjustable;
the nanofiltration equipment consists of a sand filter tank, a carbon filter tank, a security filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump.
In one embodiment of the invention, dominant bacteria are arranged inside the MBR membrane tank and the biological filter tank.
In one embodiment of the invention, two blowers are provided, one for use and one for standby, and aeration of the MBR membrane tank and the biological filter tank and back flushing air of the biological filter tank are provided.
In one embodiment of the invention, the filter press filter presses the residual sludge in the MBR membrane tank and the biological filter tank and then carries out outward transportation treatment.
The second objective of the present invention is to provide a process flow of the above recycled water recycling system switchable to meet different recycling requirements, comprising the following steps:
(S1) water delivery treatment process: conveying the raw wastewater in the anaerobic tower to an MBR membrane tank, and sequentially treating the raw wastewater by using equipment such as an MBR membrane tank → a biological filter tank or an MBR membrane tank → a nanofiltration equipment → the biological filter tank to enable the raw wastewater to reach the standard;
(S2) reflow process: the concentrated water generated by the nanofiltration equipment and the water which is not successfully treated by the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank are refluxed to the anaerobic tower for secondary treatment;
(S3) aeration treatment: the air blower provides oxygen for biochemical activities in the MBR membrane tank and the biological filter tank, and stirring and mixing treatment are also taken into consideration;
(S4) a backflushing process: utilizing an air blower to provide back flushing air for the biological filter, and providing back flushing water for the biological filter through the effluent of a clear water discharge barrel;
(S5) sludge treatment: and (4) carrying out outward transportation and discharge on the excess sludge in the biological filter and the MBR membrane tank by using a filter press.
In one embodiment of the present invention, the process flow of the recycled water recycling system switchable to meet different recycling requirements specifically includes: the five treatment processes of water delivery, backflow, aeration, backflushing and sludge are matched to finish reclaimed water recycling treatment.
In one embodiment of the invention, in the step (1), when the water requirement is GB/T19923-;
when the water requirement is GB/T29044-;
the MBR membrane tank → biological filter tank is used for treating raw wastewater conveyed by the anaerobic tower by the MBR membrane tank and the biological filter tank without being treated by nanofiltration equipment;
the MBR membrane tank → nanofiltration equipment → biological filter tank is used for treating the raw wastewater conveyed by the anaerobic tower together with the MBR membrane tank, the nanofiltration equipment and the biological filter tank.
In one embodiment of the present invention, the different recycling requirements refer to the COD specified in the quality of Industrial Water for municipal wastewater Recycling (GB/T19923-crNot more than 60mg/L, ammonia nitrogen not more than 10mg/L, pH of 6.5-8.5 andCOD in heating air-conditioning system water quality (GB/T29044-crA control project limit value of less than or equal to 30mg/L, no ammonia nitrogen regulation, and pH of 6.5-8.5. It can be seen that the difference between the two criteria is mainly in CODcrAnd the reuse indexes of other ammonia nitrogen, pH, conductivity and other reclaimed water are kept consistent. The corresponding supplementary water of the cooling water system with the above two standards can be respectively used for an open type circulating cooling water system and an open type circulating cooling water system for indirectly supplying cold for a centralized air conditioner.
In one embodiment of the invention, the inlet water of the reclaimed water recycling barrel is the water which reaches the standard and is sequentially treated by the equipment of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank', and the outlet water is the make-up water of a cooling water system.
In one embodiment of the invention, the cooling water make-up water is used in both open recirculating cooling water systems and central air conditioning indirect cooling open recirculating cooling water systems.
In one embodiment of the invention, the clear water discharge barrel is used for feeding water which reaches the standard through the sequential treatment of the equipment of MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank, and the discharged water can be discharged to a municipal pipe network or conveyed to the biological filter tank as backwash water.
In one embodiment of the invention, the inlet water of the anaerobic tower is raw wastewater consisting of production workshop wastewater and domestic sewage, concentrated water of nanofiltration equipment or substandard water treated by the equipment of MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank in sequence, and the outlet water is inlet water of the MBR membrane tank.
In one embodiment of the invention, the influent COD of the MBR membrane tankcr500-1000 mg/L; the pH value in the MBR membrane tank is 6.0-9.0, the HRT (hydraulic retention time) is 10-30 h, and the temperature is 25-40; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.06 MPa, and the effluent flow is 0.5 to 6.0m3H, COD of the effluentcr50-450 mg/L.
In one embodiment of the invention, the influent COD of the biological filter iscr50-500 mg/L, the pH value in the biological filter is 6.5-8.5, the HRT is 2-12 h, and the temperature is 15-40 ℃; effluent flow of biological filterIs 1.0 to 6.0m3H, COD of the effluentcrIs 35-55 mg/L.
In one embodiment of the invention, the feed water COD of the nanofiltration devicecr100-500 mg/L, the pH value in the nanofiltration equipment is 6.5-7.5, the HRT is 2-12 h, and the temperature is 10-40 ℃; the outlet water pressure of the nanofiltration equipment is 0.1-1.4 MPa, and the ratio of clear water to concentrated water is 3: 1-4: 1, the flow rate of clear water outlet is 1.0-8.0 m3H, COD of the effluentcr50-150 mg/L.
In one embodiment of the invention, the influent COD of the anaerobic towercr1500-5000 mg/L; the pH value in the anaerobic tower is 6.5-10.5, the HRT is 10-20 h, and the temperature is 20-40 ℃.
In one embodiment of the present invention, the reflow process does not necessarily occur, and the triggering condition specifically includes the following steps:
1) when the raw wastewater is treated by using the equipment of 'MBR membrane tank → nanofiltration equipment → biological filter', the concentrated water generated by the nanofiltration equipment is inevitably refluxed to the anaerobic tower, otherwise, the reflux treatment of the section is not performed.
2) When the effluent obtained by the biofilter treatment in the water delivery treatment process does not meet the reclaimed water reuse standard, the wastewater which does not meet the standard after the reclaimed water reuse treatment is returned to the anaerobic tower, otherwise, the return treatment of the section does not exist.
In one embodiment of the invention, the blower provides aeration at 0.015m3Gas/min/m3And (3) water.
In one embodiment of the present invention, the water backwash intensity is 0.16m when the backwash water is performed3Water/m3Filling material/min; the strength of gas back-flushing is 0.27m when the back-flushing gas is executed3Gas/m3Filler/min.
In one embodiment of the invention, the pump conveying medium in the sludge treatment process is sludge, the pipeline resistance loss is larger than that of a waste water pipeline, so the pump lift needs to be properly amplified by 2.0-3.0 times.
Compared with the prior art, the invention has the following beneficial effects:
(1) the reclaimed water recycling system can be switched to adapt to different recycling requirements by switching different equipment sequences (MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank), can adapt to different recycling requirements, and can meet the upgrading of environmental protection policies on the premise of not increasing capital construction equipment and modifying pipelines; the processing effect can be flexibly adjusted when the production and operation of the enterprise change so as to meet the internal requirements of the enterprise.
(2) The invention can switch two equipment sequences ('MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank') in the reclaimed water recycling system to adapt to different recycling requirements, greatly improves the use efficiency of each equipment, effectively prolongs the service life of each equipment and reduces the use of accessories and medicaments while the original wastewater is treated to reach the standard through the equipment sequences of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank'; the reuse cost of the reclaimed water is reduced on the whole.
(3) The reclaimed water recycling system can be switched to adapt to different recycling requirements to carry out reflux treatment on wastewater and concentrated water of the nanofiltration equipment which do not reach the standard and are sequentially treated by the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank, so that secondary pollution can be avoided; the normal and high-efficiency operation of the MBR membrane and the biological filter of the core equipment is ensured by the back flush execution of gas and water and the sludge treatment.
(4) The biological filter disclosed by the invention adopts equipment developed by Shanghai Angel environmental protection company, has the advantages of combination of a fixed bed and a fluidized bed, simultaneous operation of oxygen and anaerobic modes, real-time adjustment of each zone, maintenance of dominant strains by presetting the Angel biochemical bed, continuous operation of a system, and solving of impact of wastewater load and blockage of filter materials.
Drawings
FIG. 1 is a schematic view of a reclaimed water recycling system and process flow thereof according to the present invention, which can be switched to meet different recycling requirements;
FIG. 2 is a top view of the equipment in the recycled water recycling process system of the present invention that can be switched to accommodate different recycling requirements;
reference numbers in the figures: 1. an MBR membrane tank; 2. a biological filter; 3. nanofiltration equipment; 4. a blower; 5. a filter press; 6. an anaerobic tower; 7. a reclaimed water recycling barrel; 8. and a clear water discharging barrel.
Detailed Description
The invention provides a reclaimed water recycling system capable of being switched to adapt to different recycling requirements, which is used for a reclaimed water recycling process flow and comprises an MBR (membrane bioreactor) membrane tank, a biological filter, a nanofiltration device, a blower, a filter press, an anaerobic tower, a reclaimed water recycling barrel and a clear water discharge barrel; the device also comprises a water conveying pipeline, a return pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline;
the anaerobic tower is connected with the MBR membrane tank through a water pipeline; the MBR membrane tank is connected with a nanofiltration device and a biological filter tank through water pipelines, the nanofiltration device is connected with the biological filter tank through a water pipeline, and the biological filter tank is connected with a reclaimed water recycling barrel and a clean water discharge barrel through a water pipeline;
the biological filter and the nanofiltration equipment are connected with the anaerobic tower through a return pipeline;
the air blower is connected with the MBR membrane tank and the biological filter tank through an aeration pipeline;
the air blower is connected with the biological filter through a backflushing pipeline; the clear water discharge barrel is connected with the biological filter through a backflushing pipeline;
the MBR membrane tank and the biological filter tank are connected with a filter press through a sludge pipeline.
In one embodiment of the invention, the devices are communicated with each other through pipelines, pumps and valves.
In one embodiment of the invention, the reclaimed water recycling barrel is connected with a cooling water system through a water pipeline, and the clear water discharging barrel is connected with a municipal pipe network through a water pipeline.
In one embodiment of the invention, the water duct comprises in particular the following ducts:
1) the raw wastewater is conveyed to an anaerobic tower pipeline;
2) a pipeline from the anaerobic tower to the MBR membrane tank;
3) sequentially switching and selecting equipment from the MBR membrane tank to a biological filter tank pipeline or from the MBR membrane tank to nanofiltration equipment and then to the biological filter tank pipeline according to different recycling standard vertebra;
4) the qualified water is treated by the equipment of the MBR membrane tank → the biological filter tank or the equipment of the MBR membrane tank → the nanofiltration equipment → the biological filter tank in sequence and is sent to a reclaimed water recycling barrel pipeline from the biological filter tank;
5) the qualified water is treated by the equipment of the MBR membrane tank → the biological filter tank or the equipment of the MBR membrane tank → the nanofiltration equipment → the biological filter tank in sequence from the biological filter tank to a clear water discharge barrel pipeline;
6) a water replenishing pipeline from the reclaimed water recycling barrel to the cooling water system;
7) and the clear water is discharged from the barrel to a municipal pipe network pipeline.
In one embodiment of the invention, the return line comprises in particular the following lines:
1) the unqualified water is sequentially treated by the equipment of the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank, and the water flows from the biological filter tank to an anaerobic tower pipeline;
2) and the concentrated water produced by the nanofiltration equipment is led to an anaerobic tower pipeline from the biological filter.
In one embodiment of the invention, the aeration conduit comprises in particular the following conduits:
1) a pipeline from an air blower to the MBR membrane tank;
2) from the blower to the biological filter pipeline.
In one embodiment of the invention, the backflush line comprises in particular the following lines:
1) back flushing the gas pipeline: the air blower is connected to the biological filter pipeline, and the air blower can bypass out of the aeration pipeline at the front end of the biological filter;
2) a backwash water pipe: and the clear water is discharged from the barrel to the biological filter pipeline.
In one embodiment of the invention, the sludge pipeline specifically comprises the following pipelines:
1) from the MBR membrane tank to the filter press pipeline;
2) from the biological filter to a filter press pipeline;
3) from the filter press to a sludge outward transport pipeline.
In one embodiment of the invention, 3 groups of membrane piles are arranged in the MBR membrane pool, two groups of membrane piles are used for one group of membrane piles, and a self-priming pump with negative pressure is arranged;
the biological filter tank is equipment developed by Shanghai Egge environmental protection company, consists of 7 reaction tanks, and is provided with a reflux pump and 7 online dissolved oxygen measuring instruments; a fixed bed and a fluidized bed are arranged, and the aerobic mode and the anaerobic mode run simultaneously; the dissolved oxygen of each reaction tank in the biological filter is adjustable;
the nanofiltration equipment consists of a sand filter tank, a carbon filter tank, a security filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump.
In one embodiment of the invention, dominant bacteria are arranged inside the MBR membrane tank and the biological filter tank.
In one embodiment of the invention, two blowers are provided, one for use and one for standby, and aeration of the MBR membrane tank and the biological filter tank and back flushing air of the biological filter tank are provided.
In one embodiment of the invention, the filter press filter presses the residual sludge in the MBR membrane tank and the biological filter tank and then carries out outward transportation treatment.
The invention provides a process flow of the reclaimed water recycling system capable of being switched to adapt to different recycling requirements, which comprises the following steps:
(S1) water delivery treatment process: conveying the raw wastewater in the anaerobic tower to an MBR membrane tank, and sequentially treating the raw wastewater by using equipment such as an MBR membrane tank → a biological filter tank or an MBR membrane tank → a nanofiltration equipment → the biological filter tank to enable the raw wastewater to reach the standard;
(S2) reflow process: the concentrated water generated by the nanofiltration equipment and the water which is not successfully treated by the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank are refluxed to the anaerobic tower for secondary treatment;
(S3) aeration treatment: the air blower provides oxygen for biochemical activities in the MBR membrane tank and the biological filter tank, and stirring and mixing treatment are also taken into consideration;
(S4) a backflushing process: utilizing an air blower to provide back flushing air for the biological filter, and providing back flushing water for the biological filter through the effluent of a clear water discharge barrel;
(S5) sludge treatment: and (4) carrying out outward transportation and discharge on the excess sludge in the biological filter and the MBR membrane tank by using a filter press.
In one embodiment of the present invention, the process flow of the recycled water recycling system switchable to meet different recycling requirements specifically includes: the five treatment processes of water delivery, backflow, aeration, backflushing and sludge are matched to finish reclaimed water recycling treatment.
In one embodiment of the invention, in the step (1), when the water requirement is GB/T19923-;
when the water requirement is GB/T29044-;
the MBR membrane tank → biological filter tank is used for treating raw wastewater conveyed by the anaerobic tower by the MBR membrane tank and the biological filter tank without being treated by nanofiltration equipment;
the MBR membrane tank → nanofiltration equipment → biological filter tank is used for treating the raw wastewater conveyed by the anaerobic tower together with the MBR membrane tank, the nanofiltration equipment and the biological filter tank.
In one embodiment of the present invention, the different recycling requirements refer to the COD specified in the quality of Industrial Water for municipal wastewater Recycling (GB/T19923-crLess than or equal to 60mg/L, ammonia nitrogen less than or equal to 10mg/L, pH of 6.5-8.5, and COD in the water quality of heating and air-conditioning system (GB/T29044-crA control project limit value of less than or equal to 30mg/L, no ammonia nitrogen regulation, and pH of 6.5-8.5. It can be seen that the difference between the two criteria is mainly in CODcrAnd the reuse indexes of other ammonia nitrogen, pH, conductivity and other reclaimed water are kept consistent. The corresponding supplementary water of the cooling water system with the above two standards can be respectively used for an open type circulating cooling water system and an open type circulating cooling water system for indirectly supplying cold for a centralized air conditioner.
In one embodiment of the invention, the inlet water of the reclaimed water recycling barrel is the water which reaches the standard and is sequentially treated by the equipment of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank', and the outlet water is the make-up water of a cooling water system.
In one embodiment of the invention, the cooling water make-up water is used in both open recirculating cooling water systems and central air conditioning indirect cooling open recirculating cooling water systems.
In one embodiment of the invention, the clear water discharge barrel is used for feeding water which reaches the standard through the sequential treatment of the equipment of MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank, and the discharged water can be discharged to a municipal pipe network or conveyed to the biological filter tank as backwash water.
In one embodiment of the invention, the inlet water of the anaerobic tower is raw wastewater consisting of production workshop wastewater and domestic sewage, concentrated water of nanofiltration equipment or substandard water treated by the equipment of MBR membrane tank → biological filter tank or MBR membrane tank → nanofiltration equipment → biological filter tank in sequence, and the outlet water is inlet water of the MBR membrane tank.
In one embodiment of the invention, the influent COD of the MBR membrane tankcr500-1000 mg/L; the pH value in the MBR membrane tank is 6.0-9.0, the HRT (hydraulic retention time) is 10-30 h, and the temperature is 25-40; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.06 MPa, and the effluent flow is 0.5 to 6.0m3H, COD of the effluentcr50-450 mg/L.
In one embodiment of the invention, the influent COD of the biological filter iscr50-500 mg/L, the pH value in the biological filter is 6.5-8.5, the HRT is 2-12 h, and the temperature is 15-40 ℃; the effluent flow of the biological filter is 1.0-6.0 m3H, COD of the effluentcrIs 35-55 mg/L.
In one embodiment of the invention, the feed water COD of the nanofiltration devicecr100-500 mg/L, the pH value in the nanofiltration equipment is 6.5-7.5, the HRT is 2-12 h, and the temperature is 10-40 ℃; the outlet water pressure of the nanofiltration equipment is 0.1-1.4 MPa, and the ratio of clear water to concentrated water is 3: 1-4: 1, the flow rate of clear water outlet is 1.0-8.0 m3H, COD of the effluentcr50-150 mg/L.
In one embodiment of the invention, the influent COD of the anaerobic towercr1500-5000 mg/L; the pH value in the anaerobic tower is 6.5-10.5, the HRT is 10-20 h, and the temperature is 20-40 ℃.
In one embodiment of the present invention, the reflow process does not necessarily occur, and the triggering condition specifically includes the following steps:
1) when the raw wastewater is treated by using the equipment of 'MBR membrane tank → nanofiltration equipment → biological filter', the concentrated water generated by the nanofiltration equipment is inevitably refluxed to the anaerobic tower, otherwise, the reflux treatment of the section is not performed.
2) When the effluent obtained by the biofilter treatment in the water delivery treatment process does not meet the reclaimed water reuse standard, the wastewater which does not meet the standard after the reclaimed water reuse treatment is returned to the anaerobic tower, otherwise, the return treatment of the section does not exist.
In one embodiment of the invention, the blower provides aeration at 0.015m3Gas/min/m3And (3) water.
In one embodiment of the present invention, the water backwash intensity is 0.16m when the backwash water is performed3Water/m3Filling material/min; the strength of gas back-flushing is 0.27m when the back-flushing gas is executed3Gas/m3Filler/min.
In one embodiment of the invention, the pump conveying medium in the sludge treatment process is sludge, the pipeline resistance loss is larger than that of a waste water pipeline, so the pump lift needs to be properly amplified by 2.0-3.0 times.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The embodiment provides a reclaimed water recycling system capable of being switched to adapt to different recycling requirements, which carries out a reclaimed water recycling process flow and comprises an MBR (membrane bioreactor) membrane tank 1, a biological filter 2, a nanofiltration device 3, an air blower 4, a filter press 5, an anaerobic tower 6, a reclaimed water recycling barrel 7 and a clear water discharge barrel 8; the device also comprises a water conveying pipeline, a return pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline; the anaerobic tower 6 is connected with the MBR membrane tank 1 through a water pipeline; the MBR membrane pool 1 is connected with a nanofiltration device 3 and a biological filter 2 through water pipelines, the nanofiltration device 3 is connected with the biological filter 2 through a water pipeline, the biological filter 2 is connected with a reclaimed water recycling barrel 7 and a clear water discharging barrel 8 through water pipelines, the reclaimed water recycling barrel 7 is connected with a cooling water system through a water pipeline, and the clear water discharging barrel 8 is connected with a municipal pipe network through a water pipeline;
the biological filter 2 and the nanofiltration equipment 3 are connected with an anaerobic tower through a return pipeline;
the air blower 4 is connected with the MBR membrane tank 1 and the biological filter tank 2 through an aeration pipeline;
the clear water discharge barrel 8 and the blower 4 are connected with the biological filter 2 through a backflushing pipeline;
the MBR membrane tank 1 and the biological filter tank 2 are connected with a filter press 5 through a sludge pipeline.
3 groups of membrane piles are arranged in the MBR membrane tank 1, a second membrane pile is used for ensuring to be provided with a first membrane pile, and a negative pressure self-priming pump is arranged in the MBR membrane tank; the nanofiltration equipment 3 consists of a sand filter tank, a carbon filter tank, a security filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump; the biological filter 2 consists of 7 reaction tanks, the dissolved oxygen of each reaction tank is adjustable, and the biological filter is provided with a reflux pump and 7 online dissolved oxygen measuring instruments; the inlet water of the reclaimed water recycling barrel is the water which reaches the standard and is sequentially treated by the equipment of the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank, and the outlet water is the make-up water of the cooling water system; the cooling water make-up water is used for an open type circulating cooling water system and a central air conditioner indirect cooling open type circulating cooling water system; the clear water discharge barrel 8 is used for sequentially treating water reaching the standard through equipment of an MBR membrane tank → a biological filter tank or an MBR membrane tank → a nanofiltration device → the biological filter tank, and the outlet water can be discharged to a municipal pipe network or conveyed to the biological filter tank 2 to be used as backwash water; the inlet water of the anaerobic tower 6 is raw wastewater consisting of production workshop wastewater and domestic sewage, the concentrated water of the nanofiltration equipment 3, and the water which does not reach the standard is treated by the equipment of the MBR membrane tank → the biological filter tank or the MBR membrane tank → the nanofiltration equipment → the biological filter tank in sequence, and the outlet water is the inlet water of the MBR membrane tank 1; two air blowers 4 are arranged, one air blower is used as a spare air blower for providing aeration of the MBR membrane tank 1 and the biological filter tank 2 and back flushing air of the biological filter tank 2; and the filter press 5 is used for carrying out outward transportation treatment after filter pressing on the residual sludge in the MBR membrane tank 1 and the biological filter tank 2.
Example 2
The embodiment is used for recycling the reclaimed water of an old factory for other domestic workers in Shanghai, and the equipment sequence of 'MBR membrane tank → biological filter tank' in the reclaimed water recycling process which can be switched to adapt to different recycling requirements is required to adapt to the quality of the urban sewage recycling industrial water (GB/T19923-. The specific process is as follows:
by physical pretreatmentThe latter waste water, i.e. the influent COD of the anaerobic towercr1800-2300 mg/L; the pH value in the anaerobic tower is 7.5-9.0, the HRT is 10-15 h, and the temperature is 20-30 ℃.
COD of intaking of MBR membrane cisternacr520-760 mg/L; the pH value in the MBR membrane tank is 6.4-7.7, the HRT is 5-20 h, and the temperature is 25-35 ℃; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.06 MPa, and the effluent flow is 0.5 to 6.0m3H, COD of the effluentcr50-300 mg/L.
Influent COD of biological filtercr50-300 mg/L, the pH value of the biological filter is 6.5-8.5, the HRT is 2-6 h, and the temperature is 15-30 ℃; the water outlet flow is 2.0-6.0 m3H, COD of the effluentcr45-55 mg/L.
Experimental water the final data are shown in table 1.
TABLE 1 sequential water inlet and outlet data of MBR membrane tank → biofilter tank in reclaimed water recycling process
Figure BDA0003376819200000131
As can be seen from Table 1, COD in the sequence of "MBR membrane tank → biofilter" equipment in a reclaimed water recycling process that can be switched to meet different recycling requirementscrLess than or equal to 60mg/L, ammonia nitrogen less than or equal to 10mg/L, pH is 6.5-8.5, and the standard requirements are met. The treated reclaimed water can be reused as make-up water of the open circulating cooling water system.
Example 3
The embodiment is used for recycling the reclaimed water of a new factory of daily chemical industry of certain other resources in Shanghai in example 2, and compared with the new factory of the factory, the composition of the wastewater of the new factory is not greatly different from that of the old factory, but the influent CODcr is higher, the water volume is larger, and the reclaimed water recycling requirement is stricter. The sequence of 'MBR membrane tank → nanofiltration equipment → biological filter' in the reclaimed water recycling process which can be switched to adapt to different recycling requirements is adopted, and the requirement is adapted to the 'quality of water of heating and air conditioning systems' (GB/T29044-2012). The specific process is as follows:
the raw wastewater after physical pretreatment, namely the influent COD of the anaerobic towercr3100-4000 mg/L; anaerobic typeThe pH value in the oxygen tower is 7.5-9.5, the HRT is 10-15 h, and the temperature is 20-30 ℃.
COD of intaking of MBR membrane cisternacr610-820 mg/L; the pH value in the MBR membrane tank is 6.5-8.5, the HRT is 15-20 h, and the temperature is 25-35 ℃; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.04 MPa, and the effluent flow is 1.5 to 6.0m3H, COD of the effluentcrIs 100 to 450 mg/L.
Water inlet COD of nanofiltration equipmentcr100-450 mg/L, the pH value of the nanofiltration equipment is 6.5-7.5, and the temperature is 10-40 ℃; the effluent pressure is 0.1-1.2 MPa, and the ratio of clear water to concentrated water is 3: 1, the flow rate of clear water outlet is 1.0-6.0 m3H, COD of the effluentcr50-300 mg/L.
Influent COD of biological filtercr50-300 mg/L, the pH value of the biological filter is 6.5-8.5, the HRT is 2-6 h, and the temperature is 15-30 ℃; the water outlet flow is 2.0-6.0 m3H, COD of the effluentcr15-26 mg/L.
Experimental water the final data are shown in table 2.
Table 2 shows the sequential water inlet and outlet data of the MBR membrane tank → nanofiltration equipment → biofilter equipment in the reclaimed water recycling process
Figure BDA0003376819200000141
As can be seen from Table 2, COD in the sequence of "MBR membrane tank → nanofiltration device → biofilter" device in a reclaimed water recycling process that can be switched to meet different recycling requirementscrLess than or equal to 30mg/L, ammonia nitrogen less than or equal to 10mg/L, pH is 6.5-8.5, the treated reclaimed water can be reused as the make-up water of the central air-conditioning indirect cooling open type circulating cooling water system, and the corresponding standard requirements are met.
Example 4
The embodiment is used for recycling the reclaimed water of the wastewater of pharmaceutical enterprises in a country in Shanghai, and the equipment sequence of 'MBR membrane tank → biofilter' in the reclaimed water recycling process which can be switched to adapt to different recycling requirements is required to adapt to the quality of urban sewage recycling industrial water (GB/T19923-. The specific process is as follows:
the raw wastewater after physical pretreatment, namely the influent COD of the anaerobic towercr3700-5000 mg/L; the pH value in the anaerobic tower is 7.0-8.5, the HRT is 10-15 h, and the temperature is 25-35 ℃.
COD of intaking of MBR membrane cisternacr830-986 mg/L; the pH value in the MBR membrane tank is 6.3-7.5, the HRT is 10-15 h, and the temperature is 25-35 ℃; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.06 MPa, and the effluent flow is 1.5 to 6.0m3H, COD of the effluentcrIs 80-430 mg/L.
Influent COD of biological filtercr80-43 mg/L, the pH value of the biological filter is 6.5-8.5, the HRT is 2-6 h, and the temperature is 15-30 ℃; the water outlet flow is 1.0-6.0 m3H, COD of the effluentcr43-56 mg/L.
Experimental water the final data are shown in table 3.
TABLE 3 sequential water inlet and outlet data of MBR membrane tank → biofilter tank in reclaimed water recycling process
Figure BDA0003376819200000151
As can be seen from Table 3, COD in the sequence of "MBR membrane tank → biofilter" equipment in a reclaimed water recycling process that can be switched to meet different recycling requirementscrLess than or equal to 60mg/L, ammonia nitrogen less than or equal to 10mg/L, pH is 6.5-8.5, and the standard requirements are met. The treated reclaimed water can be reused as make-up water of the open circulating cooling water system.
Example 5
The embodiment is used for internal standard upgrading of reclaimed water recycling of the waste water of pharmaceutical enterprises in Shanghai certain countries in the embodiment 4, and the requirement on reclaimed water recycling standard is higher under the condition that the quality and the quantity of the incoming water are not changed. The sequence of 'MBR membrane tank → nanofiltration equipment → biological filter' in the reclaimed water recycling process which can be switched to adapt to different recycling requirements is adopted to adapt to the water quality of the heating and air-conditioning system (GB/T29044-. The specific process is as follows:
the raw wastewater after physical pretreatment, namely the influent COD of the anaerobic towercr3200-5000 mg/L; the pH value in the anaerobic tower is 7.5-8.5, the HRT is 10-15 h, and the temperature is 25-35 ℃.
COD of intaking of MBR membrane cisternacr830-986 mg/L; the pH value in the MBR membrane tank is 6.3-7.5, the HRT is 10-15 h, and the temperature is 25-35 ℃; the effluent pressure of an MBR membrane in the MBR membrane tank is-0.01 to-0.04 MPa, and the effluent flow is 1.0 to 5.5m3H, COD of the effluentcr130-430 mg/L.
Water inlet COD of nanofiltration equipmentcr130-430 mg/L, the pH value of the nanofiltration equipment is 6.5-7.5, and the temperature is 10-40 ℃; the effluent pressure is 0.3-1.2 MPa, and the ratio of clear water to concentrated water is 4: 1, the flow rate of clear water outlet is 2.0-8.0 m3H, COD of the effluentcrIt was 243 mg/L.
Influent COD of biological filtercr80-243 mg/L, the pH value of the biological filter is 6.5-8.5, the HRT is 2-6 h, and the temperature is 15-30 ℃; the water outlet flow is 1.0-6.0 m3H, COD of the effluentcrIs 14-28 mg/L.
Experimental water the final data are shown in table 4.
Table 4 sequential water inlet and outlet data of MBR membrane tank → nano filtration device → biofilter in reclaimed water recycling process
Figure BDA0003376819200000161
Figure BDA0003376819200000171
As can be seen from Table 4, COD in the sequence of "MBR membrane tank → nanofiltration device → biofilter" device in reclaimed water recycling process that can be switched to meet different recycling requirementscrLess than or equal to 30mg/L, ammonia nitrogen less than or equal to 10mg/L, pH is 6.5-8.5, the treated reclaimed water can be reused as the make-up water of the central air-conditioning indirect cooling open type circulating cooling water system, and the corresponding standard requirements are met.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. A reclaimed water recycling system capable of being switched to adapt to different recycling requirements is used for a reclaimed water recycling process flow and is characterized by comprising an MBR membrane pool (1), a biological filter (2), a nanofiltration device (3), a blower (4), a filter press (5), an anaerobic tower (6), a reclaimed water recycling barrel (7) and a clear water discharge barrel (8); the device also comprises a water conveying pipeline, a return pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline;
the anaerobic tower (6) is connected with the MBR membrane tank (1) through a water pipeline; the MBR membrane tank (1) is connected with a nanofiltration device (3) and a biological filter (2) through water pipelines, the nanofiltration device (3) is connected with the biological filter (2) through water pipelines, and the biological filter (2) is connected with a reclaimed water recycling barrel (7) and a clear water discharge barrel (8) through water pipelines;
the biological filter (2) and the nanofiltration equipment (3) are connected with an anaerobic tower (6) through a reflux pipeline;
the air blower (4) is connected with the MBR membrane tank (1) and the biological filter tank (2) through an aeration pipeline;
the air blower (4) is connected with the biological filter (2) through a backflushing pipeline; the clear water discharge barrel (8) is connected with the biological filter (2) through a backflushing pipeline;
the MBR membrane tank (1) and the biological filter tank (2) are connected with a filter press (5) through a sludge pipeline.
2. The reclaimed water recycling system switchable to adapt to different recycling requirements according to claim 1, wherein 3 groups of membrane stacks are arranged inside the MBR membrane tank (1) and are provided with self-priming pumps with negative pressure;
the biological filter (2) consists of 7 reaction tanks, a reflux pump and 7 online dissolved oxygen measuring instruments; a fixed bed and a fluidized bed are arranged, and the aerobic mode and the anaerobic mode run simultaneously;
the nanofiltration equipment (3) consists of a sand filter tank, a carbon filter tank, a security filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump.
3. A reclaimed water reuse system switchable to meet different reuse requirements according to claim 1, wherein two blowers (4) are provided to provide aeration of the MBR membrane tank (1) and the biological filter tank (2) and back flush air of the biological filter tank (2).
4. The reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 1, wherein the filter press (5) is used for carrying out outward treatment after filter pressing of residual sludge in the MBR membrane tank (1) and the biological filter (2).
5. A process flow of a recycled water reuse system switchable to meet different reuse requirements according to any one of claims 1 to 4, comprising the steps of:
(S1) water delivery treatment process: conveying the raw wastewater in the anaerobic tower (6) to an MBR (membrane bioreactor) membrane tank (1), and then sequentially treating the raw wastewater through equipment of 'MBR membrane tank → biological filter tank' or 'MBR membrane tank → nanofiltration equipment → biological filter tank' to enable the raw wastewater to reach the standard;
(S2) reflow process: the concentrated water generated by the nanofiltration equipment (3) and the water which is not successfully treated by the MBR membrane tank → biological filter tank or the MBR membrane tank → nanofiltration equipment → biological filter tank are refluxed to the anaerobic tower (6) for secondary treatment;
(S3) aeration treatment: the air blower (4) provides oxygen for biochemical activities in the MBR membrane tank (1) and the biological filter tank (2), and stirring and mixing treatment are simultaneously considered;
(S4) a backflushing process: the air blower (4) is used for providing back flushing air for the biological filter (2), and the effluent water of the clear water discharge barrel (8) is used for providing back flushing water for the biological filter (2);
(S5) sludge treatment: and (3) carrying out outward transportation and discharge on the excess sludge in the biological filter (2) and the MBR membrane tank (1) by using a filter press (5).
6. The process flow of the reclaimed water recycling system switchable to adapt to different recycling requirements according to claim 5, characterized in that in the step (1), in the water transportation treatment process, when the water requirement is GB/T19923-2005, the raw wastewater is treated by using the equipment sequence of 'MBR membrane tank → biological filter';
when the water requirement is GB/T29044-;
the MBR membrane tank → biological filter tank is used for treating raw wastewater conveyed by the anaerobic tower (6) by the MBR membrane tank (1) and the biological filter tank (2) without being treated by the nanofiltration equipment (3);
the MBR membrane tank → nanofiltration equipment → biological filter tank is used for jointly treating raw wastewater conveyed by the anaerobic tower (6) by the MBR membrane tank (1), the nanofiltration equipment (2) and the biological filter tank (3).
7. The process flow of the reclaimed water recycling system switchable to meet different recycling requirements according to claim 5, characterized in that the influent COD of the MBR membrane tank (1) iscr500-1000 mg/L; the pH value in the MBR membrane tank (1) is 6.0-9.0, the HRT is 10-30 h, and the temperature is 25-40; the effluent pressure of an MBR membrane in the MBR membrane tank (1) is-0.01 to-0.06 MPa, and the effluent flow is 0.5 to 6.0m3H, COD of the effluentcr50-450 mg/L.
8. The process flow of the reclaimed water recycling system switchable to meet different recycling requirements according to claim 5, wherein the influent COD of the biological filter (2)cr50-500 mg/L, the pH value in the biological filter (2) is 6.5-8.5, the HRT is 2-12 h, and the temperature is 15-40 ℃; the water outlet flow of the biological filter (2) is 1.0-6.0 m3H, COD of the effluentcrIs 35-55 mg/L.
9. The process flow of the reclaimed water recycling system switchable to meet different recycling requirements according to claim 5, wherein the influent COD of the nanofiltration device (3) iscr100-500 mgL, the pH value in the nanofiltration equipment (3) is 6.5-7.5, the HRT is 2-12 h, and the temperature is 10-40 ℃; the outlet water pressure of the nanofiltration equipment (3) is 0.1-1.4 MPa, and the ratio of clear water to concentrated water is 3: 1-4: 1, the flow rate of clear water outlet is 1.0-8.0 m3H, COD of the effluentcr50-150 mg/L.
10. The process flow of the reclaimed water recycling system switchable to meet different recycling requirements according to claim 5, wherein the influent COD of the anaerobic tower (6) iscr1500-5000 mg/L; the pH value in the anaerobic tower (6) is 6.5-10.5, the HRT is 10-20 h, and the temperature is 20-40 ℃.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101274810A (en) * 2008-05-20 2008-10-01 北京汉青天朗水处理科技有限公司 Sewage treating device and process
CN103043795A (en) * 2012-12-26 2013-04-17 上海埃格环保科技有限公司 Method for treating waste water by using composite circulating biomembrane fluidized bed
CN103304105A (en) * 2013-07-02 2013-09-18 清华大学 Deep treatment process of coked wastewater
CN104058498A (en) * 2014-07-10 2014-09-24 上海埃格环保科技有限公司 Water treatment method
CN106830540A (en) * 2017-02-28 2017-06-13 中新苏州工业园区环保技术有限公司 Liquid crystal panel advanced waste treatment apparatus
AU2020100706A4 (en) * 2020-05-05 2020-06-18 Cao, Hongyi Miss A membrane bioreactor system for rural decentralized wastewater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101274810A (en) * 2008-05-20 2008-10-01 北京汉青天朗水处理科技有限公司 Sewage treating device and process
CN103043795A (en) * 2012-12-26 2013-04-17 上海埃格环保科技有限公司 Method for treating waste water by using composite circulating biomembrane fluidized bed
CN103304105A (en) * 2013-07-02 2013-09-18 清华大学 Deep treatment process of coked wastewater
CN104058498A (en) * 2014-07-10 2014-09-24 上海埃格环保科技有限公司 Water treatment method
CN106830540A (en) * 2017-02-28 2017-06-13 中新苏州工业园区环保技术有限公司 Liquid crystal panel advanced waste treatment apparatus
AU2020100706A4 (en) * 2020-05-05 2020-06-18 Cao, Hongyi Miss A membrane bioreactor system for rural decentralized wastewater

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