CN114163072B - 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
CN114163072B
CN114163072B CN202111419733.5A CN202111419733A CN114163072B CN 114163072 B CN114163072 B CN 114163072B CN 202111419733 A CN202111419733 A CN 202111419733A CN 114163072 B CN114163072 B CN 114163072B
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water
biological filter
mbr membrane
tank
pipeline
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CN114163072A (en
Inventor
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, nanofiltration equipment, a biological filter tank, a reclaimed water recycling barrel, a clear water discharge barrel, an anaerobic tower, a blower and a filter press; comprises a water conveying pipeline, a backflow pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline. According to the invention, the MBR membrane pond, the biological filter pond or the MBR membrane pond, the nanofiltration equipment and the biological filter pond are sequentially switched to achieve different reclaimed water recycling effects so as to adapt to the reclaimed water requirements of specific enterprises at different stages, the purposes of prolonging the service life of each equipment and saving energy and reducing consumption are achieved through flexible combined equipment, and the secondary pollution is avoided by treating residual sludge, concentrated water and water which is not treated in the equipment sequence of the MBR membrane pond, the biological filter pond or the MBR membrane pond, the nanofiltration equipment and the biological filter pond.

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
A large amount of wastewater containing various pollution factors is generated in industrial production. The pollution factor which occupies a relatively large amount in the chemical industry discharged wastewater is the organic pollutant. The organic pollutants and other pollution factors can be directly discharged into municipal pipe networks and natural water bodies along with untreated or unqualified wastewater, and then cause pollution of municipal drainage pipelines, rivers, lakes and underground water bodies, and threats to ecological environments in water areas to different degrees are caused; the waste water discharged from chemical industry has huge water quantity and severe water resource shortage in China, and the reclaimed water recycling of the waste water discharged from chemical industry is very necessary. The reclaimed water used as reuse water has different water quality standards and water quality requirements according to different purposes. All countries in the world set water quality standards for improving production and protecting environment according to domestic technical and economic conditions. In China, a reclaimed water recycling requirement system is formally built from the beginning of the century, wherein the urban sewage recycling industrial water quality (GB/T19923-2005) and the heating air conditioning system water quality (GB/T29044-2012) are more commonly used. These standards are all set forth in certain specifications for reuse of reclaimed water. After chemical wastewater is subjected to biochemical treatment and advanced treatment, the tail end of daily chemical wastewater is subjected to treatment again by using a conventional membrane method, and the recycling requirements of national standards and enterprises can be met. However, the equipment simply using the membrane treatment method has high periodic replacement cost, daily consumption of medicaments, electric power and labor cost, and the pollutants in the concentrated water trapped by the membrane are not really treated, but are returned to the front end of the whole sewage treatment system after enrichment, 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 according to the quality of reclaimed water of the recycling system, so that the reclaimed water reaches the standard, and has a certain treatment effect reference value, however, the research is core of the use of membrane equipment, and the daily equipment replacement and maintenance cost are higher. The Chinese patent CN202010813150.X discloses a system and a method for recycling indoor reclaimed water in public buildings, which aim to cascade utilization of water resources. The Chinese patent CN201921635782.O discloses a reclaimed water recycling system of petrochemical wastewater to recycle reclaimed water of the petrochemical wastewater, the method adopts a modularized design to flexibly combine and communicate all components 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 outward dispatch, back flushing and back flow, has a certain flow reference value, however, the research does not reach recycling requirements of different recycling standards through adjustment in a self process, and does not have general applicability. Therefore, the method has good treatment effect, energy conservation and consumption reduction, and can be flexibly adjusted to adapt to reclaimed water recycling processes with different recycling requirements, thereby having great practical application significance.
Disclosure of Invention
The method aims at solving the defects that the existing reclaimed water recycling process is poor in treatment effect, high in energy consumption and high in equipment maintenance cost, cannot adapt to local policies or changes of internal requirements of enterprises, and achieves the purpose of reclaimed water recycling more economically and efficiently; the invention provides 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, nanofiltration equipment, a biological filter tank, a reclaimed water recycling barrel, a clear water discharge barrel, an anaerobic tower, a blower and a filter press; the device also comprises a water conveying pipeline, a backflow pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline. The devices are communicated through pipelines, pumps and valves. According to the invention, through switching equipment sequences of 'MBR membrane pond- & gt biological filter pond' or 'MBR membrane pond- & gt nanofiltration equipment- & gt biological filter pond', different reclaimed water recycling effects can be achieved so as to adapt to the reclaimed water requirements of specific enterprises in different stages, the purposes of prolonging the service life of each equipment and saving energy and reducing consumption are achieved through flexible combined equipment, and the secondary pollution is avoided by treating residual sludge, concentrated water and water which is not treated by the equipment sequences of 'MBR membrane pond- & gt biological filter pond' or 'MBR membrane pond- & gt nanofiltration equipment- & gt biological filter pond'.
The invention combines the conventional treatment equipment and biological treatment equipment, thereby prolonging the service life of the membrane equipment, reducing the burden of the biochemical treatment equipment and simultaneously producing better treatment effect. The process of a "dual-mode bioreactor" based on biological filter optimization is added in addition to the conventional "membrane treatment method". According to the recycling requirements executed in different places or the change of the internal requirements of enterprises, the equipment sequence (MBR membrane tank, biological filter tank or MBR membrane tank, nanofiltration equipment and biological filter tank) can be switched to adapt to different recycling requirements, and additional civil engineering equipment and reconstruction pipelines are not needed.
The aim of the invention can be achieved by the following technical scheme:
the first object of the invention is to provide a reclaimed water recycling system which can be switched to adapt to different recycling requirements, and is used for reclaimed water recycling process flows, and the reclaimed water recycling system comprises an MBR membrane tank, a biological filter tank, nanofiltration equipment, a blower, a filter press, an anaerobic tower, a reclaimed water recycling barrel and a clear water discharging barrel; the device also comprises a water conveying pipeline, a backflow pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline;
the anaerobic tower is connected with the MBR membrane pond through a water pipeline; the MBR membrane pond is connected with the receiving filtering device and the biological filter through the water conveying pipeline, the nanofiltration device is connected with the biological filter through the water conveying pipeline, and the biological filter is connected with the reclaimed water recycling barrel and the clear water discharging barrel through the water conveying pipeline;
the biological filter and nanofiltration equipment are connected with the anaerobic tower through a return pipeline;
the air blower is connected with the MBR membrane pond and the biological filter through the aeration pipeline;
the 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;
and the MBR membrane pond and the biological filter are connected with the filter press through a sludge pipeline.
In one embodiment of the invention, the devices are communicated through pipes, pumps and valves.
In one embodiment of the invention, the reclaimed water recycling bin is connected with the cooling water system through a water pipeline, and the clear water discharging bin is connected with the municipal pipe network through a water pipeline.
In one embodiment of the invention, the water transport pipeline specifically comprises the following pipelines:
1) A pipeline from raw wastewater to an anaerobic tower;
2) A pipeline from the anaerobic tower to the MBR membrane pond;
3) The MBR membrane pool is connected to a biological filter tank pipeline or the MBR membrane pool is connected to nanofiltration equipment and then connected to the biological filter tank pipeline, and equipment sequence switching selection is carried out according to different reuse standard vertebrae;
4) Passing through the equipment of 'MBR membrane pool → biological filter' or 'MBR membrane pool → nanofiltration equipment → biological filter' to treat qualified water sequentially and pass through the pipeline from biological filter to reclaimed water recycling barrel;
5) Passing through the equipment of 'MBR membrane pool → biological filter' or 'MBR membrane pool → nanofiltration equipment → biological filter' to treat qualified water sequentially, and then passing through the pipeline from biological filter to clear water discharge barrel;
6) A reclaimed water recycling barrel is connected to a cooling water system supplementing water pipeline;
7) And discharging the clear water from the bucket to the municipal pipe network pipeline.
In one embodiment of the invention, the return line specifically comprises the following lines:
1) Sequentially treating unqualified water by the equipment of 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter', and leading the unqualified water to pass through the pipeline from the biological filter to the anaerobic tower;
2) Concentrated water produced by the nanofiltration equipment is conveyed to the anaerobic tower pipeline by the biological filter.
In one embodiment of the invention, the aeration conduit specifically comprises the following conduits:
1) A pipeline from the blower to the MBR membrane tank;
2) From the blower to the biofilter pipeline.
In one embodiment of the invention, the backflushing conduit specifically comprises the following conduits:
1) Recoil gas pipe: the air blower can be used for feeding the biological filter to the biological filter pipeline, and the biological filter can be discharged from the side of the aeration pipeline at the front end of the biological filter;
2) Backwash water pipeline: the clear water is discharged from the barrel to the biological filter tank pipeline.
In one embodiment of the invention, the sludge conduit specifically comprises the following conduits:
1) A pipeline from the MBR membrane tank to the filter press;
2) A pipeline from the biological filter to the filter press;
3) And a pipeline from the filter press to sludge outward.
In one embodiment of the invention, 3 groups of membrane stacks are arranged in the MBR membrane tank, two or one membrane stack is guaranteed to be used, and the membrane tank is provided with a negative pressure self-priming pump;
the biological filter is equipment developed by Shanghai Egge environmental protection company, and consists of 7 reaction tanks, a reflux pump and 7 on-line dissolved oxygen meters; the device is provided with a fixed bed and a fluidized bed, and operates in an aerobic mode and an anaerobic mode simultaneously; the dissolved oxygen of each reaction tank in the biological filter tank is adjustable;
the nanofiltration equipment consists of a sand filtration tank, a carbon filtration tank, a cartridge filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump.
In one embodiment of the invention, the MBR membrane tank and the biological filter tank are internally provided with dominant bacteria.
In one embodiment of the invention, the blower is provided with two blowers, one of which is used and the other is standby, and provides aeration of the MBR membrane tank and the biological filter tank and backflushing gas of the biological filter tank.
In one embodiment of the invention, the filter press filters the excess sludge in the MBR membrane tank and the biological filter tank and then carries out outward transportation treatment.
The second object of the present invention is to provide a process flow of the reclaimed water recycling system which can be switched to adapt to different recycling requirements, comprising the following steps:
(S1) a water delivery treatment process: raw wastewater in the anaerobic tower is conveyed to an MBR membrane tank, and then the raw wastewater is treated in sequence by the MBR membrane tank, a biological filter tank or an MBR membrane tank, nanofiltration equipment and the biological filter tank so as to reach the standard;
(S2) a reflux treatment process: the concentrated water generated by the nanofiltration equipment and the water which is treated in sequence by the equipment of 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter' are returned to the anaerobic tower for re-treatment;
(S3) an aeration treatment process: the blower provides oxygen for biochemical activities in the MBR membrane pond and the biological filter, and simultaneously takes account of stirring and mixing treatment;
(S4) a backflushing treatment process: providing backflushing gas for the biological filter by using a blower, and providing backflushing water for the biological filter by discharging water from a clear water discharge barrel;
(S5) a sludge treatment process: and (5) carrying out outward transportation and discharge of the residual sludge in the biological filter and the MBR membrane tank by using a filter press.
In one embodiment of the invention, the process flow of the reclaimed water recycling system which can be switched to adapt to different recycling requirements specifically comprises the following steps: five treatment processes of water delivery, reflux, aeration, backflushing and sludge are matched to complete reclaimed water recycling treatment.
In one embodiment of the invention, in the step (1), when the water requirement is GB/T19923-2005 in the water treatment process, raw wastewater is treated sequentially by using equipment of' MBR membrane pond- & gtbiological filter;
when the water requirement is GB/T29044-2012, the raw wastewater is treated sequentially by using equipment of 'MBR membrane tank → nanofiltration equipment → biological filter';
the MBR membrane pond-biological filter is characterized in that the MBR membrane pond and the biological filter treat raw wastewater conveyed by an anaerobic tower without being treated by nanofiltration equipment;
the MBR membrane pond, nanofiltration equipment and biological filter are used for jointly treating raw wastewater conveyed by the anaerobic tower.
In one embodiment of the invention, the different reuse requirements refer to COD specified in municipal wastewater reuse Industrial Water quality (GB/T19923-2005) cr 60mg/L or less, ammonia nitrogen or 10mg/L, pH of 6.5-8.5 and COD in heating air-conditioning System Water quality (GB/T29044-2012) cr Less than or equal to 30mg/L, ammonia nitrogen not regulated, pH value of 6.5-8.5, etc. It can be seen that the two criteria differ mainly in COD cr And other reclaimed water recycling indexes such as ammonia nitrogen, pH, conductivity and the like are kept consistent. Corresponding cooling water system with above two standardsThe system supplementing water can be respectively used for indirectly cooling the open type circulating cooling water system and the centralized air conditioner.
In one embodiment of the invention, the water inlet of the reclaimed water recycling barrel is water which is treated to reach the standard sequentially through an MBR membrane tank, a biological filter tank or an MBR membrane tank, a nanofiltration device and a biological filter tank, and the water outlet is water supplementing the cooling water system.
In one embodiment of the invention, the cooling water make-up water is used in an open-type circulating cooling water system and a centralized air conditioner indirect cooling open-type circulating cooling water system.
In one embodiment of the invention, the clean water discharge barrel is filled with water which is treated to reach the standard sequentially through an MBR membrane tank, a biological filter tank or an MBR membrane tank, a nanofiltration device and a biological filter tank, and the discharged water can be discharged to a municipal pipe network or conveyed to the biological filter tank to be used as backwash water.
In one embodiment of the invention, the water entering the anaerobic tower is raw wastewater consisting of wastewater and domestic sewage in a production plant, concentrated water of nanofiltration equipment or water which does not reach the standard is treated by equipment of MBR membrane pond, biological filter pond or MBR membrane pond, nanofiltration equipment and biological filter pond in sequence, and the water entering the MBR membrane pond is discharged.
In one embodiment of the invention, the feed water COD of the MBR membrane tank cr 500-1000 mg/L; the pH value in the MBR membrane pool is 6.0-9.0, the HRT (hydraulic retention time) is 10-30 h, and the temperature is 25-40; the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.06 MPa, and the water outlet flow is 0.5 to 6.0m 3 /h, effluent COD cr 50-450 mg/L.
In one embodiment of the invention, the influent COD of the biofilter cr 50-500 mg/L, pH in the biological filter is 6.5-8.5, HRT is 2-12 h, and temperature is 15-40 ℃; the water outlet flow of the biological filter tank is 1.0-6.0 m 3 /h, effluent COD cr 35-55 mg/L.
In one embodiment of the invention, the influent COD of the nanofiltration device cr The pH value in the nanofiltration equipment is 6.5-7.5, the HRT is 2-12 h, and the temperature is 10-40 ℃ at 100-500 mg/L; water outlet pressure of nanofiltration device0.1 to-1.4 MPa, and the proportion of clear water to concentrated water is 3:1 to 4:1, the clear water outlet flow is 1.0-8.0 m 3 /h, effluent COD cr 50-150 mg/L.
In one embodiment of the invention, the influent COD of the anaerobic tower cr 1500-5000 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 necessarily occurring triggering condition specifically includes the following steps:
1) When the equipment of 'MBR membrane pool- & gt nanofiltration equipment- & gt biological filter pool' is used for sequentially treating raw wastewater, the concentrated water generated by the nanofiltration equipment is necessarily returned to the anaerobic tower, otherwise, the section of reflux treatment is not performed.
2) When the effluent obtained by the biological filter treatment in the water delivery treatment process does not meet the reclaimed water recycling standard, the waste water which is subjected to reclaimed water recycling treatment and does not reach the standard is necessarily returned to the anaerobic tower, otherwise, the section of reflux treatment is not performed.
In one embodiment of the invention, the blower provides aeration of 0.015m 3 Qi/min/m 3 And (3) water.
In one embodiment of the invention, the water backwash strength is 0.16m when the backwash is performed 3 Water/m 3 Packing/min; the strength of the back flushing gas is 0.27m when the back flushing gas is executed 3 Gas/m 3 Packing/min.
In one embodiment of the invention, the pump conveying medium in the sludge treatment process is sludge, and the pipeline resistance loss is larger than that of a waste water pipeline, so that 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 capable of being switched to adapt to different recycling requirements can 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'), and can meet the standard of the environmental protection policy on the premise of not increasing capital equipment and modifying pipelines; the processing effect can be flexibly adjusted to meet the internal requirements of enterprises when the production and operation of the enterprises change.
(2) The invention can be switched to adapt to two equipment sequences ("MBR membrane tank- & gt biological filter tank" or "MBR membrane tank- & gt nanofiltration equipment- & gt biological filter tank") in the reclaimed water recycling system with different recycling requirements, so that the service efficiency of each equipment is greatly improved, and when the raw wastewater is treated to reach the standard by the equipment sequences of the MBR membrane tank- & gt biological filter tank "or" MBR membrane tank- & gt nanofiltration equipment- & gt biological filter tank ", the service life of each equipment is effectively prolonged, and the use of accessories and medicaments is reduced; the recycling cost of reclaimed water is reduced as a whole.
(3) The reclaimed water recycling system which can be switched to adapt to different recycling requirements carries out reflux treatment on waste water which is treated in sequence by 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter' and concentrated water of the nanofiltration equipment, so that secondary pollution can be avoided; the back flushing execution of gas and water and sludge treatment ensure the normal and efficient operation of the MBR membrane and the biological filter of the core equipment.
(4) The biological filter adopts the equipment developed by Shanghai Egge environmental protection company, has the advantages of combining a fixed bed and a fluidized bed, simultaneously operating in an oxygen and anaerobic mode, adjusting each region in real time, presetting the Egge biochemical bed to keep dominant strains, continuously operating the system, and solving the problems of impact of wastewater load and blockage of filter materials.
Drawings
FIG. 1 is a schematic diagram of a reclaimed water recycling system and process flow thereof, which can be switched to adapt to different recycling requirements;
FIG. 2 is a top view of various devices in the reclaimed water reuse process system switchable to accommodate different reuse requirements in accordance with the present invention;
reference numerals in the drawings: 1. an MBR membrane pool; 2. a biological filter; 3. a nanofiltration device; 4. a blower; 5. a filter press; 6. an anaerobic tower; 7. a reclaimed water recycling barrel; 8. clear water is discharged to the bucket.
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 tank, a biological filter tank, nanofiltration equipment, a blower, a filter press, an anaerobic tower, a reclaimed water recycling barrel and a clear water discharging barrel; the device also comprises a water conveying pipeline, a backflow pipeline, an aeration pipeline, a backflushing pipeline and a sludge pipeline;
the anaerobic tower is connected with the MBR membrane pond through a water pipeline; the MBR membrane pond is connected with the receiving filtering device and the biological filter through the water conveying pipeline, the nanofiltration device is connected with the biological filter through the water conveying pipeline, and the biological filter is connected with the reclaimed water recycling barrel and the clear water discharging barrel through the water conveying pipeline;
the biological filter and nanofiltration equipment are connected with the anaerobic tower through a return pipeline;
the air blower is connected with the MBR membrane pond and the biological filter through the aeration pipeline;
the 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;
and the MBR membrane pond and the biological filter are connected with the filter press through a sludge pipeline.
In one embodiment of the invention, the devices are communicated through pipes, pumps and valves.
In one embodiment of the invention, the reclaimed water recycling bin is connected with the cooling water system through a water pipeline, and the clear water discharging bin is connected with the municipal pipe network through a water pipeline.
In one embodiment of the invention, the water transport pipeline specifically comprises the following pipelines:
1) A pipeline from raw wastewater to an anaerobic tower;
2) A pipeline from the anaerobic tower to the MBR membrane pond;
3) The MBR membrane pool is connected to a biological filter tank pipeline or the MBR membrane pool is connected to nanofiltration equipment and then connected to the biological filter tank pipeline, and equipment sequence switching selection is carried out according to different reuse standard vertebrae;
4) Passing through the equipment of 'MBR membrane pool → biological filter' or 'MBR membrane pool → nanofiltration equipment → biological filter' to treat qualified water sequentially and pass through the pipeline from biological filter to reclaimed water recycling barrel;
5) Passing through the equipment of 'MBR membrane pool → biological filter' or 'MBR membrane pool → nanofiltration equipment → biological filter' to treat qualified water sequentially, and then passing through the pipeline from biological filter to clear water discharge barrel;
6) A reclaimed water recycling barrel is connected to a cooling water system supplementing water pipeline;
7) And discharging the clear water from the bucket to the municipal pipe network pipeline.
In one embodiment of the invention, the return line specifically comprises the following lines:
1) Sequentially treating unqualified water by the equipment of 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter', and leading the unqualified water to pass through the pipeline from the biological filter to the anaerobic tower;
2) Concentrated water produced by the nanofiltration equipment is conveyed to the anaerobic tower pipeline by the biological filter.
In one embodiment of the invention, the aeration conduit specifically comprises the following conduits:
1) A pipeline from the blower to the MBR membrane tank;
2) From the blower to the biofilter pipeline.
In one embodiment of the invention, the backflushing conduit specifically comprises the following conduits:
1) Recoil gas pipe: the air blower can be used for feeding the biological filter to the biological filter pipeline, and the biological filter can be discharged from the side of the aeration pipeline at the front end of the biological filter;
2) Backwash water pipeline: the clear water is discharged from the barrel to the biological filter tank pipeline.
In one embodiment of the invention, the sludge conduit specifically comprises the following conduits:
1) A pipeline from the MBR membrane tank to the filter press;
2) A pipeline from the biological filter to the filter press;
3) And a pipeline from the filter press to sludge outward.
In one embodiment of the invention, 3 groups of membrane stacks are arranged in the MBR membrane tank, two or one membrane stack is guaranteed to be used, and the membrane tank is provided with a negative pressure self-priming pump;
the biological filter is equipment developed by Shanghai Egge environmental protection company, and consists of 7 reaction tanks, a reflux pump and 7 on-line dissolved oxygen meters; the device is provided with a fixed bed and a fluidized bed, and operates in an aerobic mode and an anaerobic mode simultaneously; the dissolved oxygen of each reaction tank in the biological filter tank is adjustable;
the nanofiltration equipment consists of a sand filtration tank, a carbon filtration tank, a cartridge filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump.
In one embodiment of the invention, the MBR membrane tank and the biological filter tank are internally provided with dominant bacteria.
In one embodiment of the invention, the blower is provided with two blowers, one of which is used and the other is standby, and provides aeration of the MBR membrane tank and the biological filter tank and backflushing gas of the biological filter tank.
In one embodiment of the invention, the filter press filters the excess 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 a reclaimed water recycling system which can be switched to adapt to different recycling requirements, comprising the following steps:
(S1) a water delivery treatment process: raw wastewater in the anaerobic tower is conveyed to an MBR membrane tank, and then the raw wastewater is treated in sequence by the MBR membrane tank, a biological filter tank or an MBR membrane tank, nanofiltration equipment and the biological filter tank so as to reach the standard;
(S2) a reflux treatment process: the concentrated water generated by the nanofiltration equipment and the water which is treated in sequence by the equipment of 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter' are returned to the anaerobic tower for re-treatment;
(S3) an aeration treatment process: the blower provides oxygen for biochemical activities in the MBR membrane pond and the biological filter, and simultaneously takes account of stirring and mixing treatment;
(S4) a backflushing treatment process: providing backflushing gas for the biological filter by using a blower, and providing backflushing water for the biological filter by discharging water from a clear water discharge barrel;
(S5) a sludge treatment process: and (5) carrying out outward transportation and discharge of the residual sludge in the biological filter and the MBR membrane tank by using a filter press.
In one embodiment of the invention, the process flow of the reclaimed water recycling system which can be switched to adapt to different recycling requirements specifically comprises the following steps: five treatment processes of water delivery, reflux, aeration, backflushing and sludge are matched to complete reclaimed water recycling treatment.
In one embodiment of the invention, in the step (1), when the water requirement is GB/T19923-2005 in the water treatment process, raw wastewater is treated sequentially by using equipment of' MBR membrane pond- & gtbiological filter;
when the water requirement is GB/T29044-2012, the raw wastewater is treated sequentially by using equipment of 'MBR membrane tank → nanofiltration equipment → biological filter';
the MBR membrane pond-biological filter is characterized in that the MBR membrane pond and the biological filter treat raw wastewater conveyed by an anaerobic tower without being treated by nanofiltration equipment;
the MBR membrane pond, nanofiltration equipment and biological filter are used for jointly treating raw wastewater conveyed by the anaerobic tower.
In one embodiment of the invention, the different reuse requirements refer to COD specified in municipal wastewater reuse Industrial Water quality (GB/T19923-2005) cr 60mg/L or less, ammonia nitrogen or 10mg/L, pH of 6.5-8.5 and COD in heating air-conditioning System Water quality (GB/T29044-2012) cr Less than or equal to 30mg/L, ammonia nitrogen not regulated, pH value of 6.5-8.5, etc. It can be seen that the two criteria differ mainly in COD cr And other reclaimed water recycling indexes such as ammonia nitrogen, pH, conductivity and the like are kept consistent. The corresponding two standard cooling water system supplementing water can be respectively used for indirectly cooling the open type circulating cooling water system and the centralized air conditioner.
In one embodiment of the invention, the water inlet of the reclaimed water recycling barrel is water which is treated to reach the standard sequentially through an MBR membrane tank, a biological filter tank or an MBR membrane tank, a nanofiltration device and a biological filter tank, and the water outlet is water supplementing the cooling water system.
In one embodiment of the invention, the cooling water make-up water is used in an open-type circulating cooling water system and a centralized air conditioner indirect cooling open-type circulating cooling water system.
In one embodiment of the invention, the clean water discharge barrel is filled with water which is treated to reach the standard sequentially through an MBR membrane tank, a biological filter tank or an MBR membrane tank, a nanofiltration device and a biological filter tank, and the discharged water can be discharged to a municipal pipe network or conveyed to the biological filter tank to be used as backwash water.
In one embodiment of the invention, the water entering the anaerobic tower is raw wastewater consisting of wastewater and domestic sewage in a production plant, concentrated water of nanofiltration equipment or water which does not reach the standard is treated by equipment of MBR membrane pond, biological filter pond or MBR membrane pond, nanofiltration equipment and biological filter pond in sequence, and the water entering the MBR membrane pond is discharged.
In one embodiment of the invention, the feed water COD of the MBR membrane tank cr 500-1000 mg/L; the pH value in the MBR membrane pool is 6.0-9.0, the HRT (hydraulic retention time) is 10-30 h, and the temperature is 25-40; the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.06 MPa, and the water outlet flow is 0.5 to 6.0m 3 /h, effluent COD cr 50-450 mg/L.
In one embodiment of the invention, the influent COD of the biofilter cr 50-500 mg/L, pH in the biological filter is 6.5-8.5, HRT is 2-12 h, and temperature is 15-40 ℃; the water outlet flow of the biological filter tank is 1.0-6.0 m 3 /h, effluent COD cr 35-55 mg/L.
In one embodiment of the invention, the influent COD of the nanofiltration device cr The pH value in the nanofiltration equipment is 6.5-7.5, the HRT is 2-12 h, and the temperature is 10-40 ℃ at 100-500 mg/L; the water outlet pressure of the nanofiltration equipment is 0.1 to-1.4 MPa, and the ratio of clear water to concentrated water is 3:1 to 4:1, the clear water outlet flow is 1.0-8.0 m 3 /h, effluent COD cr 50-150 mg/L.
In one embodiment of the invention, the influent COD of the anaerobic tower cr 1500-5000 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 necessarily occurring triggering condition specifically includes the following steps:
1) When the equipment of 'MBR membrane pool- & gt nanofiltration equipment- & gt biological filter pool' is used for sequentially treating raw wastewater, the concentrated water generated by the nanofiltration equipment is necessarily returned to the anaerobic tower, otherwise, the section of reflux treatment is not performed.
2) When the effluent obtained by the biological filter treatment in the water delivery treatment process does not meet the reclaimed water recycling standard, the waste water which is subjected to reclaimed water recycling treatment and does not reach the standard is necessarily returned to the anaerobic tower, otherwise, the section of reflux treatment is not performed.
In one embodiment of the invention, the blower provides aeration of 0.015m 3 Qi/min/m 3 And (3) water.
In one embodiment of the invention, the water backwash strength is 0.16m when the backwash is performed 3 Water/m 3 Packing/min; the strength of the back flushing gas is 0.27m when the back flushing gas is executed 3 Gas/m 3 Packing/min.
In one embodiment of the invention, the pump conveying medium in the sludge treatment process is sludge, and the pipeline resistance loss is larger than that of a waste water pipeline, so that the pump lift needs to be properly amplified by 2.0-3.0 times.
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
The embodiment provides a reclaimed water recycling system which can be switched to adapt to different recycling requirements, and carries out a reclaimed water recycling process flow, wherein the reclaimed water recycling system comprises an MBR membrane tank 1, a biological filter tank 2, nanofiltration equipment 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 backflow 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 pond 1 is connected with the receiving and filtering equipment 3 and the biological filter pond 2 through water pipelines, the nanofiltration equipment 3 is connected with the biological filter pond 2 through water pipelines, the biological filter pond 2 is connected with the reclaimed water recycling barrel 7 and the clear water discharging barrel 8 through water pipelines, the reclaimed water recycling barrel 7 is connected with the cooling water system through water pipelines, and the clear water discharging barrel 8 is connected with the municipal pipe network through water pipelines;
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 pond 1 and the biological filter pond 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 stacks are arranged in the MBR membrane tank 1, two membrane stacks are guaranteed to be used for one membrane stack, and a negative pressure self-priming pump is arranged in the MBR membrane tank; the nanofiltration equipment 3 consists of a sand filtration tank, a carbon filtration 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 on-line dissolved oxygen measuring instruments; the reclaimed water recycling barrel is filled with water which is treated to reach the standard sequentially through an MBR membrane tank, a biological filter tank or an MBR membrane tank, nanofiltration equipment and a biological filter tank, and the discharged water is filled with water for a cooling water system; the cooling water supplementing water is used for an open type circulating cooling water system and a centralized air conditioner indirect cooling open type circulating cooling water system; the water inlet of the clear water discharge barrel 8 is water which is treated to reach the standard sequentially through the MBR membrane tank, the biological filter tank or the MBR membrane tank, nanofiltration equipment and the biological filter tank, and the discharged water can be discharged to a municipal pipe network or conveyed to the biological filter tank 2 to be used as backwash water; the water inlet of the anaerobic tower 6 is raw wastewater consisting of production workshop wastewater and domestic sewage, concentrated water of the nanofiltration device 3, and water which does not reach the standard is treated by the equipment of MBR membrane pond, biological filter pond or MBR membrane pond, nanofiltration device and biological filter pond in sequence, and the water outlet is water inlet of the MBR membrane pond 1; the two blowers 4 are arranged, one blower is used as a standby, and aeration of the MBR membrane tank 1 and the biological filter tank 2 and backflushing gas of the biological filter tank 2 are provided; the filter press 5 carries out the outward transportation treatment after the filter pressing of the residual sludge in the MBR membrane tank 1 and the biological filter tank 2.
Example 2
The embodiment is used for recycling reclaimed water in old factories for daily employment of certain foreign resources in Shanghai, adopts an equipment sequence of ' MBR membrane pond- & gt biological filter in the reclaimed water recycling process which can be switched to adapt to different recycling requirements, and meets the requirement of ' urban sewage recycling industrial water quality ' (GB/T19923-2005). The specific process is as follows:
raw wastewater after physical pretreatment, namely the inflow COD of the anaerobic tower cr 1800-2300 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 pond cr 520-760 mg/L; the pH value in the MBR membrane pool is 6.4-7.7, the HRT is 5-20 h, and the temperature is 25-35 ℃;the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.06 MPa, and the water outlet flow is 0.5 to 6.0m 3 /h, effluent COD cr 50-300 mg/L.
Influent COD of biological filter cr 50-300 mg/L, pH of the biological filter is 6.5-8.5, HRT is 2-6 h, and temperature is 15-30 ℃; the water flow rate is 2.0-6.0 m 3 /h, effluent COD cr 45-55 mg/L.
The final data obtained for the experimental effluent are shown in table 1.
Table 1 data of water passing in and out in order of "MBR Membrane pool- & gt biological Filter" equipment in water reuse Process
As can be seen from Table 1, the COD in the equipment sequence of the MBR membrane pond and the biological filter in the reclaimed water recycling process which can be switched to adapt to different recycling requirements cr Less than or equal to 60mg/L, ammonia nitrogen less than or equal to 10mg/L, pH and 6.5 to 8.5, and meets the corresponding standard requirements. The treated reclaimed water can be reused for supplementing water for the open-type circulating cooling water system.
Example 3
This example was used for reuse of reclaimed water in a new plant of daily chemical industry for offshore construction in example 2, which has a higher inflow CODcr, a higher water yield and a stricter reclaimed water reuse requirement than the old plant, although the new plant has no great difference in wastewater composition. An equipment sequence of 'MBR membrane pool- & gt nanofiltration equipment- & gt biological filter pool' in a reclaimed water recycling process which can be switched to adapt to different recycling requirements is adopted, and the requirements of 'heating air-conditioning system water quality' (GB/T29044-2012) are met. The specific process is as follows:
raw wastewater after physical pretreatment, namely the inflow COD of the anaerobic tower cr 3100-4000 mg/L; the pH value in the anaerobic tower is 7.5-9.5, the HRT is 10-15 h, and the temperature is 20-30 ℃.
COD of intaking of MBR membrane pond cr 610-820 mg/L; the pH value in the MBR membrane pool is 6.5-8.5, the HRT is 15-20 h, and the temperature is 25-35 ℃; the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.04 MPa, and the water outlet flow is 1.5 to the whole range6.0m 3 /h, effluent COD cr 100-450 mg/L.
Influent COD of nanofiltration equipment cr The pH of the nanofiltration equipment is between 6.5 and 7.5, and the temperature is between 10 and 40 ℃ at the concentration of 100 to 450mg/L; the water outlet pressure is 0.1-1.2 MPa, and the ratio of clear water to concentrated water is 3:1, the clear water outlet flow is 1.0-6.0 m 3 /h, effluent COD cr 50-300 mg/L.
Influent COD of biological filter cr 50-300 mg/L, pH of the biological filter is 6.5-8.5, HRT is 2-6 h, and temperature is 15-30 ℃; the water flow rate is 2.0-6.0 m 3 /h, effluent COD cr 15-26 mg/L.
The final data obtained for the experimental effluent are shown in table 2.
Table 2 data of water in and out of MBR membrane tank, nanofiltration device and biological filter device in the water recycling process
As can be seen from Table 2, the COD in the order of the MBR membrane pond, the nanofiltration equipment and the biological filter equipment in the reclaimed water recycling process which can be switched to adapt to different recycling requirements cr The ammonia nitrogen concentration is less than or equal to 30mg/L and less than or equal to 10mg/L, pH and is 6.5-8.5, the treated reclaimed water meets the corresponding standard requirements, and the reclaimed water can be reused for supplementing water for the indirect cooling open type circulating cooling water system of the centralized air conditioner.
Example 4
The embodiment is used for reclaimed water reuse of waste water of a certain national pharmaceutical enterprise in Shanghai, adopts an equipment sequence of 'MBR membrane pond → biological filter' in a reclaimed water reuse process which can be switched to adapt to different reuse requirements, and is required to adapt to 'urban sewage recycling industrial water quality' (GB/T19923-2005). The specific process is as follows:
raw wastewater after physical pretreatment, namely the inflow COD of the anaerobic tower cr 3700-5000 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 pond cr 830-986 mg/L; in the MBR membrane tankThe pH is 6.3-7.5, the HRT is 10-15 h, and the temperature is 25-35 ℃; the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.06 MPa, and the water outlet flow is 1.5 to 6.0m 3 /h, effluent COD cr 80-430 mg/L.
Influent COD of biological filter cr 80-43 mg/L, pH of the biological filter is 6.5-8.5, HRT is 2-6 h, and temperature is 15-30 ℃; the water flow rate is 1.0-6.0 m 3 /h, effluent COD cr 43-56 mg/L.
The final data obtained for the experimental effluent are shown in table 3.
Table 3 data of water passing in and out in order of "MBR Membrane pool- & gt biological Filter" equipment in water reuse Process
As can be seen from Table 3, the COD in the equipment sequence of the MBR membrane pond and the biological filter in the reclaimed water recycling process which can be switched to adapt to different recycling requirements cr Less than or equal to 60mg/L, ammonia nitrogen less than or equal to 10mg/L, pH and 6.5 to 8.5, and meets the corresponding standard requirements. The treated reclaimed water can be reused for supplementing water for the open-type circulating cooling water system.
Example 5
The embodiment is used for internal standard extraction of reclaimed water reuse of wastewater of a certain national pharmaceutical enterprise in Shanghai in embodiment 4, and the requirement on the reclaimed water reuse standard is higher under the condition that the quality and the quantity of the incoming water are unchanged. An equipment sequence of 'MBR membrane pool- & gt nanofiltration equipment- & gt biological filter pool' in a reclaimed water recycling process which can be switched to adapt to different recycling requirements is adopted, and the requirements of 'heating air-conditioning system water quality' (GB/T29044-2012) are met. The specific process is as follows:
raw wastewater after physical pretreatment, namely the inflow COD of the anaerobic tower cr 3200-5000 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 pond cr 830-986 mg/L; the pH value in the MBR membrane pool is 6.3-7.5, the HRT is 10-15 h, and the temperature is 25-35 ℃; the water outlet pressure of the MBR membrane in the MBR membrane pool is-0.01 to-0.04 MPa,the water flow rate is 1.0-5.5 m 3 /h, effluent COD cr 130-430 mg/L.
Influent COD of nanofiltration equipment cr 130-430 mg/L, the pH of the nanofiltration equipment is 6.5-7.5, and the temperature is 10-40 ℃; the water outlet pressure is 0.3-1.2 MPa, and the ratio of clear water to concentrated water is 4:1, the clear water outlet flow is 2.0-8.0 m 3 /h, effluent COD cr 243mg/L.
Influent COD of biological filter cr 80-243 mg/L, pH of the biological filter is 6.5-8.5, HRT is 2-6 h, and temperature is 15-30 ℃; the water flow rate is 1.0-6.0 m 3 /h, effluent COD cr 14-28 mg/L.
The final data obtained for the experimental effluent are shown in table 4.
Table 4 shows the water inlet and outlet data of the MBR membrane tank, nanofiltration device and biological filter device in the water recycling process
As can be seen from Table 4, the COD in the order of the MBR membrane tank, the nanofiltration device and the biological filter device in the reclaimed water recycling process which can be switched to adapt to different recycling requirements cr The ammonia nitrogen concentration is less than or equal to 30mg/L and less than or equal to 10mg/L, pH and is 6.5-8.5, the treated reclaimed water meets the corresponding standard requirements, and the reclaimed water can be reused for supplementing water for the indirect cooling open type circulating cooling water system of the centralized air conditioner.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments 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-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (8)

1. The 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 tank (1), a biological filter tank (2), nanofiltration equipment (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 backflow 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 pond (1) is connected with the receiving and filtering equipment (3) and the biological filter pond (2) through a water pipeline, the nanofiltration equipment (3) is connected with the biological filter pond (2) through a water pipeline, and the biological filter pond (2) is connected with the reclaimed water recycling barrel (7) and the clear water discharging barrel (8) through a water pipeline;
the biological filter (2) and the nanofiltration equipment (3) are connected with the anaerobic tower (6) through a backflow pipeline;
the air blower (4) is connected with the MBR membrane tank (1) and the biological filter tank (2) through an aeration pipeline;
the 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;
3 groups of membrane stacks are arranged in the MBR membrane tank (1), and a negative pressure self-priming pump is arranged in the MBR membrane tank;
the biological filter (2) consists of 7 reaction tanks and is provided with a reflux pump and 7 online dissolved oxygen meters; a fixed bed and a fluidized bed are arranged, and an aerobic mode and an anaerobic mode are operated simultaneously;
the nanofiltration equipment (3) consists of a sand filtration tank, a carbon filtration tank, a cartridge filter and 6 membrane components, and is provided with a booster pump and a scale inhibitor metering pump;
when the water requirement is GB/T19923-2005, the raw wastewater is treated sequentially by using the equipment of 'MBR membrane tank → biological filter';
when the water requirement is GB/T29044-2012, the raw wastewater is treated sequentially by using equipment of 'MBR membrane tank → nanofiltration equipment → biological filter';
the MBR membrane pond-biological filter is characterized in that raw wastewater conveyed by an anaerobic tower (6) is treated by the MBR membrane pond (1) and the biological filter (2) without being treated by nanofiltration equipment (3);
the MBR membrane pond, nanofiltration equipment and biological filter are used for jointly treating raw wastewater conveyed by the anaerobic tower (6) through the MBR membrane pond (1), the nanofiltration equipment (2) and the biological filter (3);
the pH value in the MBR membrane pool (1) is 6.0-9.0, the HRT is 10-30 h, and the temperature is 25-40; the water outlet pressure of the MBR membrane in the MBR membrane pool (1) is-0.01 to-0.06 MPa, and the water outlet flow is 0.5 to 6.0m 3 /h, effluent COD cr 50-450 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 m 3 /h, effluent COD cr 35-55 mg/L;
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 water outlet pressure of the nanofiltration equipment (3) is 0.1 to-1.4 MPa, and the proportion of clear water to concentrated water is 3:1 to 4:1, the clear water outlet flow is 1.0-8.0 m 3 /h, effluent COD cr 50-150 mg/L.
2. The reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 1, wherein two blowers (4) are arranged to provide aeration of the MBR membrane tank (1) and the biological filter tank (2) and backflushing gas of the biological filter tank (2).
3. The reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 1, wherein the filter press (5) carries out outward transportation treatment after filtering and pressing residual sludge in the MBR membrane tank (1) and the biological filter tank (2).
4. A process flow of a reclaimed water recycling system switchable to accommodate different recycling requirements as claimed in any one of claims 1 to 3, comprising the steps of:
(S1) a water delivery treatment process: raw wastewater in an anaerobic tower (6) is conveyed to an MBR membrane tank (1), and then the raw wastewater is treated in sequence by 'MBR membrane tank → biological filter' or 'MBR membrane tank → nanofiltration equipment → biological filter' equipment so as to reach the standard;
(S2) a reflux treatment process: the concentrated water generated by the nanofiltration equipment (3) and the water which is treated in sequence by the equipment of 'MBR membrane pond → biological filter' or 'MBR membrane pond → nanofiltration equipment → biological filter' are returned to the anaerobic tower (6) for re-treatment;
(S3) an aeration treatment process: the blower (4) provides oxygen for biochemical activities in the MBR membrane tank (1) and the biological filter tank (2), and simultaneously takes account of stirring and mixing treatment;
(S4) a backflushing treatment process: the blower (4) is utilized to provide backflushing gas for the biological filter (2), and the water discharged from the clear water discharge barrel (8) is utilized to provide backflushing water for the biological filter (2);
(S5) a sludge treatment process: and (3) carrying out outward transportation and discharge of the residual sludge in the biological filter (2) and the MBR membrane tank (1) by utilizing a filter press (5).
5. The process flow of the reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 4, which is characterized in that the inflow COD of the MBR membrane tank (1) cr 500-1000 mg/L.
6. The process flow of the reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 4 is characterized in that the inflow COD of the biological filter (2) cr 50-500 mg/L.
7. The process flow of the reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 4 is characterized in that the inflow COD of the nanofiltration equipment (3) cr 100-500 mg/L.
8. The process flow of the reclaimed water recycling system capable of being switched to adapt to different recycling requirements according to claim 4 is characterized in that the inflow COD of the anaerobic tower (6) cr 1500-5000 mg/L; the pH value in the anaerobic tower (6) is 6.5-10.5, the HRT is 10-20 h, and the temperature is20～40℃。
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