CN116675387B - System and method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration - Google Patents

System and method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration Download PDF

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Publication number
CN116675387B
CN116675387B CN202310827874.3A CN202310827874A CN116675387B CN 116675387 B CN116675387 B CN 116675387B CN 202310827874 A CN202310827874 A CN 202310827874A CN 116675387 B CN116675387 B CN 116675387B
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China
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rotating disc
biological rotating
water
denitrification
tank
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CN116675387A (en
Inventor
刘再亮
胡振民
孟海玲
章钦
王雅萍
练建军
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Anhui University of Technology AHUT
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Anhui University of Technology AHUT
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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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F2209/16—Total nitrogen (tkN-N)
    • 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
    • C02F2303/04—Disinfection
    • 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
    • C02F3/302—Nitrification and denitrification treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a system and a method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration, and relates to the technical field of water pollution treatment; the system comprises a coagulation tank, a sedimentation-biological rotating disc filtration integrated tank, a denitrification-biological rotating disc filtration integrated tank and a disinfection tank, wherein a biological rotating disc filtration device is arranged in an upper clear water area of the sedimentation-biological rotating disc filtration integrated tank and the denitrification-biological rotating disc filtration integrated tank, a carbon source adding pipe is arranged at a bottom water outlet pipe of a water outlet channel at one side of the sedimentation-biological rotating disc filtration integrated tank, a side wall water outlet pipe and a bottom water outlet pipe are connected on the water outlet channel, and a backflow driving pump is arranged in a water outlet backflow channel at one side of the denitrification-biological rotating disc filtration integrated tank. The invention realizes the nitrification-nitrification cycle and the nitrification-denitrification-nitrification cycle of water diversion and water diversion, and the flushing is completed by adopting the water inflow and the air washing and the transverse flushing, and the system and the method have simple process, comprehensive functions, low energy consumption and high efficiency.

Description

System and method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration
Technical Field
The invention belongs to the technical field of water pollution treatment, and particularly relates to a system and a method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration.
Background
The secondary sedimentation tank effluent of the town sewage plant still contains a certain amount of organic matters, ammonia nitrogen, total nitrogen, phosphorus, suspended matters and the like at present, and most of the secondary sedimentation tank effluent can only meet the first-level B emission standard. In this regard, most sewage treatment plants in China adopt a coagulation, precipitation, filtration and disinfection process when upgrading, and the process can only improve the discharged water quality to the first-level A standard. With the increasingly strict requirements of environmental protection water treatment, the discharge standard of the first-stage A gradually cannot meet the requirements, and the effluent quality of the secondary sedimentation tank needs to be further improved to the IV-class water quality of the surface water.
The biological membrane method not only can improve the effluent quality of the secondary sedimentation tank to the IV-class water quality of the surface water, but also has relatively good economical efficiency, and is one of the most common processes for advanced sewage treatment. However, the difficulty in the advanced treatment process is how to ensure that the total nitrogen reaches the standard, and especially the total nitrogen is difficult to reach the standard and discharge in winter in low-temperature seasons. Therefore, in the engineering, the combined technology of the aerobic biomembrane method and the anoxic biomembrane method is often adopted to improve the denitrification efficiency, when the A-O technology is adopted to strengthen the denitrification, the reflux amount of nitrifying liquid is large, the energy consumption is serious, and when the inverted O-A technology is adopted to denitrify, the effluent of the A pool does not have dissolved oxygen, the requirement that the dissolved oxygen in the effluent is not lower than 2mg/L can not be met, in addition, the filler in the A pool and the O pool must be backwashed, the common gas-water combined backwashed not only increases the equipment investment, but also has high operation energy consumption and is uneconomical. Therefore, in the process of deeply treating the effluent of the secondary sedimentation tank to achieve the IV-class quality of the surface water, the existing elevation of the sewage plant is considered, the unnecessary investment and energy consumption for secondary lifting are reduced, and meanwhile, the investment and energy consumption for back flow, combined back flushing of air and water, aeration oxygenation and the like are reduced, so that the low-consumption and high-efficiency treatment is very important.
The device and the method for deeply treating the secondary sedimentation tank effluent with low consumption and high efficiency are applied for and obtained national patent application (a device and a method for filtering and purifying sewage by using a hydraulic drive self-cleaning biological rotating disc, the authorized number is CN 115414727B), and the authorized patent is suitable for the situation that the total nitrogen of the incoming water reaches the standard by further removing various pollutants such as organic matters, ammonia nitrogen, phosphorus, suspended matters and the like in the treatment process of the primary A by fully utilizing the potential energy of the incoming water. However, when the total nitrogen concentration of the incoming water is higher, the denitrification treatment is performed by coupling with anoxic denitrification, so that innovation of a treatment system and a treatment method is needed aiming at the condition that the total nitrogen does not reach the standard, investment and operation energy consumption of nitrifying liquid reflux, gas-water combined backwashing, aeration oxygenation and the like in the conventional technology are reduced or avoided, low-consumption and high-efficiency treatment of the secondary sedimentation tank effluent is realized, and meanwhile, the secondary sedimentation tank effluent comprehensively reaches the IV-class water quality standard of the surface water.
Disclosure of Invention
The invention aims to provide a system and a method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration, which are used for solving the problems of reducing or avoiding investment and operation energy consumption of nitrifying liquid reflux, gas-water combined backwashing, aeration oxygenation and the like in the conventional technology when the secondary sedimentation tank effluent is deeply treated aiming at total nitrogen in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the system for treating the effluent of the secondary sedimentation tank based on the biological rotating disc filtration comprises a coagulation tank, a sedimentation-biological rotating disc filtration integrated tank, a denitrification-biological rotating disc filtration integrated tank and a disinfection tank, wherein an inclined plate is arranged in the middle of the sedimentation-biological rotating disc filtration integrated tank, and a biological rotating disc filtration device is arranged in a clear water area at the upper part of the sedimentation-biological rotating disc filtration integrated tank;
the middle part of the denitrification-biological rotating disc filtration integrated tank is provided with a filler, and a biological rotating disc filtration device is arranged in a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank;
the water outlet of the coagulation tank is connected with the water inlet at one side of the sedimentation-biological rotating disc filtration integrated tank, a water outlet channel is arranged at the other side of the sedimentation-biological rotating disc filtration integrated tank, and a carbon adding pipe is arranged at a water outlet pipe at the bottom of the water outlet channel;
the side wall water outlet pipe of the water outlet channel is connected with a biological rotating disc filtering device in the denitrification-biological rotating disc filtering integrated pool through a pipeline, and a water inlet driving valve is connected to the pipeline; when no carbon source is added into the water outlet channel, a part of water flows into a biological rotating disc filtering device of the denitrification-biological rotating disc filtering integrated pool through a water inlet driving valve to perform aerobic nitrification treatment;
the bottom water outlet pipe of the water outlet channel is connected with the bottom water inlet area of the denitrification-biological rotating disc filtration integrated pool through a pipeline, and the pipeline is connected with a denitrification water inlet valve; the denitrification treatment method comprises the steps of adding a carbon source into a water outlet channel, and then enabling the other part of water to flow into the bottom of a denitrification-biological rotating disc filtration integrated pool through a denitrification water inlet valve to perform denitrification treatment;
a water outlet backflow channel is arranged on one side of the denitrification-biological rotating disc filtration integrated tank, and is connected with the disinfection tank through a pipeline and used for discharging a part of water reaching the standard in the water outlet backflow channel into the disinfection tank;
a reflux driving pump is arranged in the water outlet reflux channel and is connected with a biological rotating disc filtering device in the sedimentation-biological rotating disc filtering integrated tank through a pipeline; the biological rotating disc filtering device is used for refluxing the other part of water in the water outlet backflow channel to the sedimentation-biological rotating disc filtering integrated tank.
The invention fully utilizes the height of the upper clear water zone of the structure, realizes integration of precipitation and biodegradation filtration, realizes integration of denitrification and biodegradation filtration, fully digs the potential of the structure on the premise of not influencing the functions of the respective structures, and improves the degradation efficiency; by utilizing the unique structural characteristics of the biological rotating disc filtering device, the continuity of aerobic nitrification is realized by introducing the other part of water discharged from the sedimentation-biological rotating disc filtering integrated tank to the water inlet component above the denitrification-biological rotating disc filtering integrated tank, meanwhile, the biological rotating disc filtering device is driven to rotate, and the water flows back to the water inlet component of the sedimentation-biological rotating disc filtering integrated tank through the backflow driving pump, so that the biological rotating disc filtering device is driven to rotate, and meanwhile, the small circulation is realized, the fully nitrified nitrate nitrogen and nitrite nitrogen are provided for the large circulation denitrification, and the biological rotating disc filtering device is driven by the cascade hydraulic power. In addition, part of effluent of the sedimentation-biological rotating disc filtration integrated tank is independently supplemented with carbon sources to enter the denitrification-biological rotating disc filtration tank for denitrification treatment, and then the effluent is continuously nitrified and pollutants such as organic matters, suspended matters and the like are removed by a biological rotating disc filtration device in the tank, so that the effluent quality is ensured, the reoxygenation of the effluent can be automatically realized, the effluent comprehensively reaches the IV-type quality of surface water, and a breakthrough technology with low cost and high efficiency is provided for upgrading and modifying sewage plants at home and abroad and advanced treatment.
Preferably, the side wall water outlet pipe of the water outlet channel is higher than the bottom water outlet pipe of the water outlet channel;
the side wall water outlet pipe and the bottom water outlet pipe are used for respectively guiding out water flows with different water qualities in the water outlet channel to carry out different treatments.
Preferably, the biological rotating disc filtering device comprises a biological rotating disc filtering main body and a water inlet component positioned above the biological rotating disc filtering main body;
the water inlet driving valve is connected with a water inlet component above the denitrification-biological rotating disc filtration integrated tank through a pipeline and is used for driving a biological rotating disc filtration main body in a clear water area of the denitrification-biological rotating disc filtration integrated tank by water inlet;
the reflux driving pump is connected with a water inlet component above the sedimentation-biological rotating disc filtration integrated tank through a pipeline and is used for driving a biological rotating disc filtration main body in a clear water area of the sedimentation-biological rotating disc filtration integrated tank through reflux water.
Preferably, the biological rotating disc filtering device further comprises a back flushing assembly positioned inside the biological rotating disc filtering main body;
at least two backwash pumps are also arranged in the water outlet backflow channel, at least one backwash pump is connected with a backwash assembly in the sedimentation-biological rotating disc filtration integrated tank through a pipeline, and at least one backwash pump is connected with a backwash assembly in the denitrification-biological rotating disc filtration integrated tank through a pipeline.
Preferably, a water inlet area at the bottom of the denitrification-biological rotating disc filtration integrated tank is connected with a gas washing valve through a pipeline;
the denitrification-biological rotating disc filtration integrated pool is characterized in that a flushing drainage channel is arranged on one side, far away from the water outlet backflow channel, of the denitrification-biological rotating disc filtration integrated pool, and a flushing drainage valve is arranged on a flushing drainage pipe at the bottom of the flushing drainage channel.
Preferably, the filler is a hollow sphere plastic filler with a porous structure.
Preferably, a flushing flap valve is arranged on the denitrification-biological rotating disc filtering integrated tank;
the flushing flap valve is positioned on a partition wall between a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank and the water outlet backflow channel, and the lowest point of the flushing flap valve is higher than the bottom of the clear water area;
the flushing flap valve is provided with a plurality of flushing flap valves which are horizontally and uniformly arranged on the partition wall.
Preferably, the number of the denitrification-biological rotating disc filtration integrated tanks is N, and N is more than or equal to 2; the N denitrification-biological rotating disc filtration integrated tanks are operated in parallel, and share one water outlet backflow channel;
when one of the denitrification-biological rotating disc filtration integrated tanks is washed or backwashed, the rest denitrification-biological rotating disc filtration integrated tanks still normally operate, so that water in the water outlet backflow channel is ensured to be used for washing, backwashed and backflow;
the N denitrification-biological rotating disc filtration integrated tanks are formed by independently arranging the N denitrification-biological rotating disc filtration integrated tanks or are divided into N independent spaces by the total denitrification-biological rotating disc filtration integrated tanks.
The method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration by adopting the system comprises the following steps:
s1, water after precipitation and dephosphorization in a coagulation tank flows into a water outlet channel of the precipitation-biological rotating disc filtration integrated tank after nitrification, organic matter removal and suspended matter removal treatment by a biological rotating disc filtration device positioned at the upper part of the precipitation-biological rotating disc filtration integrated tank;
s2, part of water without adding a carbon source in the water outlet channel directly enters a water inlet component above the denitrification-biological rotating disc filtration integrated tank through a water inlet driving valve and falls down, and then flows into a water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank after being continuously nitrified, organic matters removed and suspended matters removed through a biological rotating disc filtration device arranged in a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank;
the water added with the carbon source in the other part of the water outlet channel enters a bottom water inlet area of the denitrification-biological rotating disc filtration integrated tank through a denitrification water inlet valve, enters a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank after denitrification treatment is carried out through a filler, and then continuously nitrifies, removes organic matters and removes suspended matters through a biological rotating disc filtration device arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank, and then flows into a water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank after treatment;
s3, enabling part of water in the water outlet backflow channel to enter a disinfection tank for disinfection treatment and then reach the standard and be discharged;
and part of water in the water outlet backflow channel flows back to a water inlet component above the sedimentation-biological rotating disc filtering integrated tank through a backflow driving pump, and enters the water outlet channel to repeat S2 to realize circulation after being treated by a biological rotating disc filtering device arranged in the sedimentation-biological rotating disc filtering integrated tank.
Preferably, the method further comprises:
s4, when the water level in the sedimentation-biological rotating disc filtration integrated tank and the water level in the denitrification-biological rotating disc filtration integrated tank are respectively higher than the set water level, performing the following treatment:
s4-1, part of water in the water outlet backflow channel enters the inside of a biological rotating disc filtering device arranged in a clear water area at the upper part of the sedimentation-biological rotating disc filtering integrated tank and the inside of the biological rotating disc filtering device arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtering integrated tank respectively through a back flushing pump to carry out back flushing;
s4-2, when the water level in the denitrification-biological rotating disc filtration integrated tank is still higher than the set water level or the water level in the water outlet channel of the sedimentation-biological rotating disc filtration integrated tank is higher than the set water level after the step S4-1 is completed, performing the following flushing operation:
firstly, closing a denitrification water inlet valve and a water inlet driving valve, and opening a flushing water discharge valve to discharge water in a clear water area at the upper part of the denitrification-biological rotating disc filtering integrated tank;
secondly, when the biological rotating disc filtering device at the upper part of the denitrification-biological rotating disc filtering integrated tank is completely exposed in the air, opening an air washing valve, and scrubbing the filler by using the air;
and finally, opening a denitrification water inlet valve and a water inlet driving valve to respectively wash the filler from bottom to top and the water falling gravity to wash the biological rotating disc filtering device at the upper part of the denitrification-biological rotating disc filtering integrated tank from top to bottom by the combination of gas and water, simultaneously, pushing the washing flap valve to carry out transverse washing by water in the backflow water outlet channel under the action of water level difference, discharging washing water in three directions outside through the washing drain valve, and finally closing the gas washing valve and the washing drain valve, and continuing to run after washing is finished.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention fully utilizes the clear water area on the upper part of the structure, is provided with the biological rotating disc filter device to realize nitrification, removal of organic matters, suspended matters and the like, and skillfully utilizes the water flow of the nitrified liquid for reflux denitrification to drive the biological rotating disc filter device to operate, thereby achieving two purposes, and having low energy consumption and high efficiency.
(2) The invention realizes multiple functions of precipitation, nitrification, denitrification, suspended matter removal, reoxygenation and the like by utilizing the precipitation-biological rotating disc filtration integrated tank and the denitrification-biological rotating disc filtration integrated tank, is completely different from an O-A-O three-tank serial denitrification process and an inverted A-O denitrification process in the transmission sense, has O-O nitrification circulation and O-A-O nitrification-denitrification-nitrification reoxygenation circulation for separating water quality and water quantity, and realizes multiple-function high-efficiency treatment by ingenious process and system structural design.
(3) The invention fully utilizes clear effluent of the sedimentation-biological rotating disc filtration integrated tank to carry out water washing, so that the effect of water washing is enhanced, only air washing is designed, thus investment and operation cost are saved, in addition, the flushing flap valve is arranged to transversely flush, flushing water from bottom to top and flushing water falling from the upper water inlet component are accelerated to be discharged out rapidly, flushing efficiency is further improved, and all the flushing water is gravity water flow, so that additional investment and operation cost are not needed, and low energy consumption and high efficiency are achieved.
Drawings
Fig. 1 is a front view of a system for treating secondary sedimentation tank effluent based on biological rotating disc filtration in example 1 of the present invention;
FIG. 2 is a top view of the system for treating effluent from a secondary sedimentation tank based on the double circulation of the biological rotating disc filtration in the embodiment 1 of the present invention;
FIG. 3 is a schematic view of an internal flush flap of example 1 of the present invention;
FIG. 4 is a top view of the integrated denitrification-bio-disc filtration tank according to example 2 of the present invention;
FIG. 5 is a partial sectional view of the integrated denitrification-bio-disc filtration tank according to example 2 of the present invention.
Reference numerals: 1. a coagulation pool; 2. sedimentation-biological rotating disc filtration integrated tank; 2-1, sloping plate; 2-2, a mud pipe; 3. a biological rotating disc filter; 3-1, a water inlet assembly; 3-2, a biological rotating disc filtering main body; 3-3, back flushing assembly; 4. a denitrification-biological rotating disc filtration integrated tank; 4-1, a water inlet driving valve; 4-2, flushing the drain valve; 4-3, denitrification water inlet valve; 4-4, filling; 4-5, a gravity drainage valve; 4-6, a gas wash valve; 4-7, driving a pump by backflow; 4-8, a backwash pump; 4-9, flushing a flap valve; 4-10, a carbon source adding pipe; 5. a disinfection tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the embodiment provides a system and a method for double-circulation low-consumption high-efficiency advanced treatment of secondary sedimentation tank effluent based on biological rotating disc filtration; the method comprises the following steps:
referring to fig. 1-2, the system for double-circulation low-consumption high-efficiency advanced treatment of secondary sedimentation tank effluent based on biological rotating disk filtration comprises a coagulation tank 1, a sedimentation-biological rotating disk filtration integrated tank 2, a denitrification-biological rotating disk filtration integrated tank 4 and a disinfection tank 5.
In the embodiment, the middle part of the sedimentation-biological rotating disc filtration integrated tank 2 is provided with an inclined plate 2-1, the bottom is provided with a sludge discharge pipe 2-2, and a biological rotating disc filtration device 3 is arranged above the inclined plate 2-1. The biological rotating disc filter device 3 consists of a biological rotating disc filter main body 3-2, a water inlet component 3-1 positioned above the biological rotating disc filter main body 3-2 and a back flushing component 3-3 positioned inside the biological rotating disc filter main body 3-2.
Further, the specific structure of the biological rotating disc filtering device 3 can adopt a hydraulic driving self-cleaning biological rotating disc filtering and purifying sewage device and a hydraulic driving self-cleaning biological rotating disc filtering and purifying sewage method in the patent with the authority number of CN115414727B, and the hydraulic driving self-cleaning biological rotating disc filtering and purifying sewage device comprises a biological rotating disc filter, a water inlet assembly and a back flushing assembly.
The central water outlet pipe of the biological rotating disc filtering main body 3-2 is flush with the liquid level of the clear water area, and the arrangement is such that half of the biological rotating disc filtering main body 3-2 is immersed in water and the other half is exposed in air. Considering the length and width of the sedimentation-biological rotary disc filtration integrated pool 2 and the height of the clear water area comprehensively, more than 1 biological rotary disc filtration device 3 can be installed, for example, according to the length x width of the sedimentation-biological rotary disc filtration integrated pool 2 of 10 x 5m and the height of the clear water area of 1m, 4 sets of biological rotary disc filtration devices 3 with the length of 5m and the diameter of 2m can be installed, and the total volume of the fillers which can be installed in the biological rotary disc filtration devices 3 is about 45m 3 。
In the embodiment, the denitrification-biological rotating disc filtration integrated tank 4 consists of a water inlet driving valve 4-1, a flushing drain valve 4-2, a denitrification water inlet valve 4-3, a filler 4-4, a gravity drain valve 4-5, an air washing valve 4-6, a reflux driving pump 4-7, a backwashing pump 4-8, a flushing flap valve 4-9 and a biological rotating disc filtration device 3.
Further, the filler 4-4 is located in the middle of the denitrification-biological rotating disc filtration integrated tank 4 and used for anoxic denitrification, and the biological rotating disc filtration device 3 is installed in a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4. The denitrification water inlet valve 4-3, the air washing valve 4-6 and the gravity water discharge valve 4-5 are connected to the bottom water inlet area of the denitrification-biological rotating disc filtration integrated tank 4 through respective pipelines, the flushing water discharge valve 4-2 is connected to the flushing water discharge channel of the denitrification-biological rotating disc filtration integrated tank 4 through pipelines, and the reflux driving pump 4-7 and the back flushing pump 4-8 are arranged in the water outlet reflux channel of the denitrification-biological rotating disc filtration integrated tank 4.
Further, 2 backwashing pumps 4-8 are arranged, and respectively backwash a biological rotating disc filter device 3 positioned at the upper part of the denitrification-biological rotating disc filter integrated tank 4 and a biological rotating disc filter device 3 positioned at the upper part of the sedimentation-biological rotating disc filter integrated tank 2 are used for backwashing, so that the double functions of nitrifying liquid backflow are achieved at the same time, and the backwashing does not influence the operation of the biological rotating disc filter device 3.
Further, the filler 4-4 is a hollow sphere plastic filler with a porous structure.
Further, the flushing flap valve 4-9 is arranged on a partition wall between a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4 and the water outlet backflow canal, and the lowest point of the flushing flap valve 4-9 is higher than the bottom of the clear water area. A plurality of flushing flaps 4-9 are horizontally and uniformly arranged. The flushing flap valve 4-9 is automatically closed at ordinary times and is only opened when the denitrification-biological rotating disc filtration integrated tank 4 enters a flushing stage, so that water in the effluent return channel flows to a clear water area of the denitrification-biological rotating disc filtration integrated tank 4 by gravity.
Further, a gravity drain valve 4-5 is connected to a pipeline between the denitrification water inlet valve 4-3 and the denitrification-biological rotating disc filtration integrated tank 4 through a pipeline for pre-draining sediment before emptying or flushing.
It should be noted that, as shown in fig. 2 and 4, the planar positions of the water inlet driving valve 4-1, the flushing drain valve 4-2, the denitrification water inlet valve 4-3, the gravity drain valve 4-5 and the air washing valve 4-6 of the denitrification-biological rotating disc filtration integrated tank 4 are only schematic, and may be all arranged on one side of the denitrification-biological rotating disc filtration integrated tank 4 in a concentrated manner, or may be alternatively arranged on both sides of the denitrification-biological rotating disc filtration integrated tank 4.
In the embodiment, a water outlet channel is arranged at one side of the sedimentation-biological rotating disc filtration integrated tank 2, a carbon source adding pipe 4-10 is arranged at a water outlet pipe at the bottom of the water outlet channel, after adding a carbon source, the carbon source enters the denitrification-biological rotating disc filtration integrated tank 4 through a denitrification water inlet valve 4-3, and part of water outlet of the denitrification-biological rotating disc filtration integrated tank 4 is refluxed through a reflux driving pump 4-7, so that nitrification-denitrification-nitrification circulation is realized.
The position of the side wall water outlet pipe of the water outlet channel is higher than the position of the bottom water outlet pipe of the water outlet channel and keeps a certain horizontal distance with the bottom water outlet pipe of the water outlet channel; part of water which is not added with a carbon source in the water outlet channel flows out through a side wall water outlet pipe of the water outlet channel, then enters a water inlet component 3-1 above a denitrification-biological rotating disc filtration integrated tank 4 through a water inlet driving valve 4-1, and is continuously subjected to degradation organic matters and nitration reaction through a biological rotating disc filtration device 3, and part of water which is discharged from the denitrification-biological rotating disc filtration integrated tank 4 is refluxed through a reflux driving pump 4-7, so that nitration-nitration circulation is realized. After part of the effluent of the denitrification-biological rotating disc filtration integrated tank 4 is refluxed by a reflux driving pump 4-7, the functions of driving the biological rotating disc filtration device 3 in the sedimentation-biological rotating disc filtration integrated tank 2 to operate are realized while the nitrification-denitrification-nitrification cycle and the nitrification-nitrification cycle are realized.
The nitrification-denitrification-nitrification cycle and the nitrification-nitrification cycle are water-separating circulation, namely, the effluent of the effluent channel of the sedimentation-biological rotating disc filtration integrated tank 2 enters the bottom of the denitrification-biological rotating disc filtration integrated tank 4, so that the water quality for denitrification is different from the water quality of the biological rotating disc filtration device 3 entering the upper part of the denitrification-biological rotating disc filtration integrated tank 4.
Further, the distribution flow can be regulated and controlled through the denitrification water inlet valve 4-3 and the water inlet driving valve 4-1 according to the actual water quantity and quality.
The working principle of the system for the double-circulation low-consumption high-efficiency advanced treatment of the secondary sedimentation tank effluent based on biological rotating disc filtration is as follows:
as shown in fig. 1 and 2, water from a secondary sedimentation tank enters a sedimentation-biological rotating disc filtration integrated tank 2 after coagulation treatment in a coagulation tank 1, and a clear water area with the height of about 1m is formed at the upper part of the sedimentation-biological rotating disc filtration integrated tank 2 after sedimentation treatment by an inclined plate 2-1.
The water in the clear water area in the sedimentation-biological rotating disc filtration integrated tank 2 flows into the water outlet channel of the sedimentation-biological rotating disc filtration integrated tank 2 after being treated by the biological rotating disc filtration device 3.
As shown in fig. 2, a part of water (without supplementing carbon source) in the water outlet channel of the integrated sedimentation-biological rotating disc filtration tank 2 flows out of the water outlet channel through a plurality of water outlet pipes, flows into the integrated denitrification-biological rotating disc filtration tank 4 through a water inlet driving valve 4-1 after being summarized, more specifically, as shown in fig. 1, a part of water (without supplementing carbon source) flows out through a water outlet pipe positioned near the lower part of the water outlet channel liquid level, flows into a water inlet component 3-1 of a biological rotating disc filtration device 3 arranged at the upper part of the integrated denitrification-biological rotating disc filtration tank 4 through a water inlet driving valve 4-1, and flows into a water outlet backflow channel of the integrated denitrification-biological rotating disc filtration tank 4 after flowing into the central water outlet pipe after flowing into the inside the biological rotating disc filtration body 3-2 while the biological rotating disc filtration body 3-2 below the water inlet component 3-1 drives the biological rotating disc filtration body 3-2 to continuously perform microbial aerobic degradation and nitrification reaction to convert ammonia nitrogen into non-nitrate nitrogen and nitrite nitrogen (as shown in fig. 5), so as to be a nitrification-nitrified circulation.
As shown in fig. 2, another part of water in the water outlet channel of the integrated sedimentation-bio-disc filtration tank 2 (the carbon source is supplemented by the carbon source adding pipe 4-10) flows into the integrated denitrification-bio-disc filtration tank 4 through the denitrification water inlet valve 4-3, more specifically, as shown in fig. 1, the other part of water flows out through the water outlet pipe positioned at the bottom of the water outlet channel (the carbon source is supplemented by the carbon source adding pipe 4-10), flows into the water inlet area at the bottom of the integrated denitrification-bio-disc filtration tank 4 through the denitrification water inlet valve 4-3, then flows upward through the filler 4-4 in the middle of the integrated denitrification-bio-disc filtration tank 4, then flows into the clear water area at the upper part of the integrated denitrification-bio-disc filtration tank 4, is processed through the bio-disc filtration main body 3-2, and then also flows into the inside of the integrated denitrification-bio-disc filtration tank 4 after being collected by the central water outlet pipe, thus being nitrified-denitrified and circulated.
As shown in fig. 1 and 2, the positions of a part of water (without supplementing carbon source) in the water outlet channel of the integrated sedimentation-biological rotating disc filtration tank 2 and the other part of water (supplementing carbon source by the carbon source adding pipe 4-10) in the water outlet channel of the integrated sedimentation-biological rotating disc filtration tank 2, which flow out of the water outlet channel, are different in both horizontal direction and height direction, so that the purpose of the arrangement is to water out water, and the potential energy of water is utilized as much as possible, the water out of which is not supplemented with carbon source continues to carry out microbial aerobic degradation and nitration reaction, and the enhanced nitration treatment converts more ammonia nitrogen into nitrate nitrogen and nitrite nitrogen; the effluent water supplemented with the carbon source by the carbon source adding pipe 4-10 needs to meet a certain carbon/nitrogen ratio, and can be better denitrified to convert nitrate nitrogen and nitrite nitrogen into nitrogen. If the carbon source is fully supplemented to the effluent of the sedimentation-biological rotating disc filtration integrated tank 2 without difference, not only the waste of the carbon source is caused, but also the load of the biological rotating disc filtration device 3 at the upper part of the denitrification-biological rotating disc filtration integrated tank 4 is increased, thereby playing a negative effect. Besides separating water, the water quality can be conveniently regulated and distributed according to the change of the water quality and the water quantity through the water inlet driving valve 4-1 and the denitrification water inlet valve 4-3, so that the final water quality of the discharged water is better ensured.
As shown in fig. 1 and 2, part of the water in the water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4 flows into the disinfection tank 5 and finally is discharged outside, a backflow driving pump 4-7 and a backwashing pump 4-8 are arranged in the water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4, part of the water in the water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4 flows back to a water inlet component 3-1 of a biological rotating disc filtration device 3 arranged at the upper part of a sedimentation-biological rotating disc filtration integrated tank 2 through the backflow driving pump 4-7, and the water in the water outlet backflow channel is backflow to the sedimentation-biological rotating disc filtration integrated tank 2 while being used for driving the biological rotating disc filtration main body 3-2 below to rotate.
Part of water in the water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4 is also used for backwashing of the biological rotating disc filtration device 3 arranged in the sedimentation-biological rotating disc filtration integrated tank 2 and the denitrification-biological rotating disc filtration integrated tank 4 through a backwashing pump 4-8.
As shown in fig. 1, 2 and 3, a flushing drain pipe at the bottom of a flushing drain channel of the integrated denitrification-biological rotating disc filtration tank 4 is provided with a flushing drain valve 4-2, a flushing flap 4-9 is arranged on a partition wall between a water outlet backflow channel of the integrated denitrification-biological rotating disc filtration tank 4 and a clear water area at the upper part of the integrated denitrification-biological rotating disc filtration tank 4, the flushing flap 4-9 is horizontally and uniformly arranged, the lowest position of the flushing flap 4-9 is higher than the bottom of the clear water area, the flushing flap 4-9 is automatically closed under the action of the water level difference between the clear water area and the water outlet backflow channel (the difference between the water level of the clear water area and the water outlet backflow channel represented by a solid line in fig. 3) and the gravity of the water outlet backflow channel during flushing under the action of the water level difference between the clear water area and the water outlet backflow channel (the water outlet backflow channel represented by the dotted line in fig. 3) in order to transversely open the water flow in the backflow channel into the clear water area, the flushing flap 4-9 is arranged on the other side of the integrated denitrification-biological rotating disc filtration tank 4, and the water inlet valve 4-4 is arranged at the bottom of the integrated denitrification-biological rotating disc filtration tank 4 is arranged at one side of the integrated denitrification-filtration tank 4.
As shown in fig. 1 to 5, the method for deeply treating the effluent of the secondary sedimentation tank based on the double-circulation low-consumption efficient deep treatment of the biological rotating disc filtration of the invention is further described by combining the functions of the system for deeply treating the effluent of the secondary sedimentation tank based on the double-circulation low-consumption efficient deep treatment of the biological rotating disc filtration, and comprises the following steps:
1) The water after the phosphorus removal by sedimentation in the coagulation tank 1 is subjected to nitrification, organic matter removal and suspended matter removal treatment by a biological rotating disc filter device 3 positioned at the upper part of the sedimentation-biological rotating disc filter integrated tank 2, and then flows into a water outlet channel of the sedimentation-biological rotating disc filter integrated tank 2;
part of water without adding carbon source in the water outlet channel directly enters the water inlet assembly 3-1 above the denitrification-biological rotating disc filtration integrated tank 4 through the water inlet driving valve 4-1, falls down, is continuously subjected to nitrification, organic matter removal and suspended matter removal treatment through the biological rotating disc filtration device 3 arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4, and then flows into the water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4.
The other part of water added with a carbon source in the water outlet channel enters a water inlet area at the bottom of the denitrification-biological rotating disc filtration integrated tank 4 through a denitrification water inlet valve 4-3, enters a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4 after denitrification treatment through a filler 4-4 at the middle part, continuously nitrifies, removes organic matters and removes suspended matters through a biological rotating disc filtration device 3 arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4, and then flows into a water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank 4.
Part of water in the water outlet backflow channel enters the disinfection tank 5 for disinfection treatment and then is discharged after reaching the standard, part of water in the water outlet backflow channel flows back to the water inlet component 3-1 above the sedimentation-biological rotating disc filtering integrated tank 2 through the backflow driving pump 4-7, and enters the water outlet channel for circulation after being treated by the biological rotating disc filtering device 3 arranged in the sedimentation-biological rotating disc filtering integrated tank 2.
2) When the water level in the sedimentation-biological rotating disc filtration integrated tank 2 and the water level in the denitrification-biological rotating disc filtration integrated tank 4 are respectively higher than the set water level, part of water in the water outlet backflow channel enters the biological rotating disc filtration device 3 arranged in the clear water area at the upper part of the sedimentation-biological rotating disc filtration integrated tank 2 and the biological rotating disc filtration device 3 arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank 4 respectively through the backwash pump 4-8 for backwash.
3) And when the water level in the denitrification-biological rotating disc filtration integrated tank 4 is still higher than the set water level or the water level in the water outlet channel of the sedimentation-biological rotating disc filtration integrated tank 2 is higher than the set water level after the step 2 is completed, the flushing operation of the step 4 is performed.
4) Firstly, a denitrification water inlet valve 4-3 and a water inlet driving valve 4-1 are closed, a flushing drain valve 4-2 is opened to drain water (at the moment, the suspended solids concentration is high and the suspended solids are turbid) in a clear water area at the upper part of a denitrification-biological rotating disc filtration integrated tank 4;
secondly, when the biological rotating disc filtering device 3 at the upper part of the denitrification-biological rotating disc filtering integrated tank 4 is completely exposed in the air, the air washing valve 4-6 is opened, and the filler 4-4 is scrubbed by the air;
finally, the denitrification water inlet valve 4-3 and the water inlet driving valve 4-1 are opened to respectively wash the filler 4-4 from bottom to top in a gas-water combination way and the water falling gravity is used for washing the biological rotating disc filter device 3 at the upper part of the denitrification-biological rotating disc filter integrated tank 4 from top to bottom, meanwhile, water in the reflux water outlet channel is used for pushing the washing flap valve 4-9 to carry out transverse washing under the action of water level difference, washing water in three directions is discharged through the washing drain valve 4-2, finally, the gas washing valve 4-6 and the washing drain valve 4-2 are closed, and after washing is finished, the operation is continued.
Example 2:
the difference from example 1 is that the arrangement of the denitrification-bio-disc filtration integrated tank 4 in this example 2 is different.
As shown in fig. 4 to 5, in another arrangement form of the integrated denitrification-biological rotating disc filtration tank 4 according to the length and width dimensions of the integrated denitrification-biological rotating disc filtration tank 4 and the height of the upper clear water zone, the number of the installed biological rotating disc filtration devices 3 is flexibly arranged, and it is particularly pointed out that the integrated denitrification-biological rotating disc filtration tank 4 can be operated in parallel, more than 2 completely independent integrated denitrification-biological rotating disc filtration tanks 4 can be operated in parallel (at this time, the water outlet backflow channels are communicated), or one integrated denitrification-biological rotating disc filtration tank 4 can be divided into N grids (N is equal to or greater than 2) to be operated in parallel, and the advantage of the parallel operation is that when 1 or 1 grid of the integrated denitrification-biological rotating disc filtration tank 4 is flushed into the water outlet backflow channels, water is ensured to be used for flushing, backwashing and backflow in the water outlet backflow channels, so that the operation of the whole system is not affected.
The foregoing is only for aiding in understanding the method and the core of the invention, but the scope of the invention is not limited thereto, and it should be understood that the technical scheme and the inventive concept according to the invention are equivalent or changed within the scope of the invention by those skilled in the art. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (7)

1. System of two sedimentation tank effluent of double circulation processing based on biological rotating disk filtration, including coagulating basin, deposit-biological rotating disk filtration integration pond, denitrogenation-biological rotating disk filtration integration pond and disinfection pond, its characterized in that:
the middle part of the sedimentation-biological rotating disc filtration integrated tank is provided with an inclined plate, and a biological rotating disc filtration device is arranged in a clear water area at the upper part of the sedimentation-biological rotating disc filtration integrated tank;
the middle part of the denitrification-biological rotating disc filtration integrated tank is provided with a filler, and a biological rotating disc filtration device is arranged in a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank;
the water outlet of the coagulation tank is connected with the water inlet at one side of the sedimentation-biological rotating disc filtration integrated tank, a water outlet channel is arranged at the other side of the sedimentation-biological rotating disc filtration integrated tank, and a carbon adding pipe is arranged at a water outlet pipe at the bottom of the water outlet channel;
the side wall water outlet pipe of the water outlet channel is connected with a biological rotating disc filtering device in the denitrification-biological rotating disc filtering integrated pool through a pipeline, and a water inlet driving valve is connected to the pipeline; when no carbon source is added into the water outlet channel, a part of water flows into a biological rotating disc filtering device of the denitrification-biological rotating disc filtering integrated pool through a water inlet driving valve to perform aerobic nitrification treatment;
the bottom water outlet pipe of the water outlet channel is connected with the bottom water inlet area of the denitrification-biological rotating disc filtration integrated pool through a pipeline, and the pipeline is connected with a denitrification water inlet valve; the denitrification treatment method comprises the steps of adding a carbon source into a water outlet channel, and then enabling the other part of water to flow into the bottom of a denitrification-biological rotating disc filtration integrated pool through a denitrification water inlet valve to perform denitrification treatment;
a water outlet backflow channel is arranged on one side of the denitrification-biological rotating disc filtration integrated tank, and is connected with the disinfection tank through a pipeline and used for discharging a part of water reaching the standard in the water outlet backflow channel into the disinfection tank;
a reflux driving pump is arranged in the water outlet reflux channel and is connected with a biological rotating disc filtering device in the sedimentation-biological rotating disc filtering integrated tank through a pipeline; the biological rotating disc filtering device is used for refluxing the other part of water in the water outlet reflux canal to the sedimentation-biological rotating disc filtering integrated tank;
the biological rotating disc filtering device comprises a biological rotating disc filtering main body and a water inlet component positioned above the biological rotating disc filtering main body;
the water inlet driving valve is connected with a water inlet component above the denitrification-biological rotating disc filtration integrated tank through a pipeline and is used for driving a biological rotating disc filtration main body in a clear water area of the denitrification-biological rotating disc filtration integrated tank by water inlet;
the reflux driving pump is connected with a water inlet component above the sedimentation-biological rotating disc filtration integrated tank through a pipeline and is used for driving a biological rotating disc filtration main body in a clear water area of the sedimentation-biological rotating disc filtration integrated tank by reflux water;
the biological rotating disc filtering device further comprises a back flushing assembly positioned inside the biological rotating disc filtering main body;
at least two backwash pumps are also arranged in the water outlet backflow channel, at least one backwash pump is connected with a backwash assembly in the sedimentation-biological rotating disc filtration integrated tank through a pipeline, and at least one backwash pump is connected with a backwash assembly in the denitrification-biological rotating disc filtration integrated tank through a pipeline;
the bottom water inlet area of the denitrification-biological rotating disc filtration integrated tank is connected with an air washing valve through a pipeline;
the denitrification-biological rotating disc filtration integrated pool is characterized in that a flushing drainage channel is arranged on one side, far away from the water outlet backflow channel, of the denitrification-biological rotating disc filtration integrated pool, and a flushing drainage valve is arranged on a flushing drainage pipe at the bottom of the flushing drainage channel.
2. The system for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration according to claim 1, wherein the side wall outlet pipe of the effluent channel is positioned higher than the bottom outlet pipe of the effluent channel;
the side wall water outlet pipe and the bottom water outlet pipe are used for respectively guiding out water flows with different water qualities in the water outlet channel to carry out different treatments.
3. The system for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration according to claim 1, wherein the filler is hollow sphere plastic filler with a porous structure.
4. The system for treating secondary sedimentation tank effluent based on biological rotating disc filtration according to claim 3, wherein a flushing flap valve is installed on the denitrification-biological rotating disc filtration integrated tank;
the flushing flap valve is positioned on a partition wall between a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank and the water outlet backflow channel, and the lowest point of the flushing flap valve is higher than the bottom of the clear water area;
the flushing flap valve is provided with a plurality of flushing flap valves which are horizontally and uniformly arranged on the partition wall.
5. The system for double circulation treatment of secondary sedimentation tank effluent based on biological rotating disk filtration according to any one of claims 1 to 4, wherein,
the number of the denitrification-biological rotating disc filtration integrated tanks is N, and N is more than or equal to 2; the N denitrification-biological rotating disc filtration integrated tanks are operated in parallel, and share one water outlet backflow channel;
when one of the denitrification-biological rotating disc filtration integrated tanks is washed or backwashed, the rest denitrification-biological rotating disc filtration integrated tanks still normally operate, so that water in the water outlet backflow channel is ensured to be used for washing, backwashed and backflow;
the N denitrification-biological rotating disc filtration integrated tanks are formed by independently arranging the N denitrification-biological rotating disc filtration integrated tanks or are divided into N independent spaces by the total denitrification-biological rotating disc filtration integrated tanks.
6. A method for treating secondary sedimentation tank effluent by using the system of claim 5 based on double circulation of biological rotating disc filtration, comprising the following steps:
s1, water after precipitation and dephosphorization in a coagulation tank flows into a water outlet channel of the precipitation-biological rotating disc filtration integrated tank after nitrification, organic matter removal and suspended matter removal treatment by a biological rotating disc filtration device positioned at the upper part of the precipitation-biological rotating disc filtration integrated tank;
s2, part of water without adding a carbon source in the water outlet channel directly enters a water inlet component above the denitrification-biological rotating disc filtration integrated tank through a water inlet driving valve and falls down, and then flows into a water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank after being continuously nitrified, organic matters removed and suspended matters removed through a biological rotating disc filtration device arranged in a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank;
the water added with the carbon source in the other part of the water outlet channel enters a bottom water inlet area of the denitrification-biological rotating disc filtration integrated tank through a denitrification water inlet valve, enters a clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank after denitrification treatment is carried out through a filler, and then continuously nitrifies, removes organic matters and removes suspended matters through a biological rotating disc filtration device arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtration integrated tank, and then flows into a water outlet backflow channel of the denitrification-biological rotating disc filtration integrated tank after treatment;
s3, enabling part of water in the water outlet backflow channel to enter a disinfection tank for disinfection treatment and then reach the standard and be discharged;
and part of water in the water outlet backflow channel flows back to a water inlet component above the sedimentation-biological rotating disc filtering integrated tank through a backflow driving pump, and enters the water outlet channel to repeat S2 to realize circulation after being treated by a biological rotating disc filtering device arranged in the sedimentation-biological rotating disc filtering integrated tank.
7. The method for treating secondary sedimentation tank effluent based on double circulation of biological rotating disc filtration according to claim 6, further comprising:
s4, when the water level in the sedimentation-biological rotating disc filtration integrated tank and the water level in the denitrification-biological rotating disc filtration integrated tank are respectively higher than the set water level, performing the following treatment:
s4-1, part of water in the water outlet backflow channel enters the inside of a biological rotating disc filtering device arranged in a clear water area at the upper part of the sedimentation-biological rotating disc filtering integrated tank and the inside of the biological rotating disc filtering device arranged in the clear water area at the upper part of the denitrification-biological rotating disc filtering integrated tank respectively through a back flushing pump to carry out back flushing;
s4-2, when the water level in the denitrification-biological rotating disc filtration integrated tank is still higher than the set water level or the water level in the water outlet channel of the sedimentation-biological rotating disc filtration integrated tank is higher than the set water level after the step S4-1 is completed, performing the following flushing operation:
firstly, closing a denitrification water inlet valve and a water inlet driving valve, and opening a flushing water discharge valve to discharge water in a clear water area at the upper part of the denitrification-biological rotating disc filtering integrated tank;
secondly, when the biological rotating disc filtering device at the upper part of the denitrification-biological rotating disc filtering integrated tank is completely exposed in the air, opening an air washing valve, and scrubbing the filler by using the air;
and finally, opening a denitrification water inlet valve and a water inlet driving valve to respectively wash the filler from bottom to top and the water falling gravity to wash the biological rotating disc filtering device at the upper part of the denitrification-biological rotating disc filtering integrated tank from top to bottom by the combination of gas and water, simultaneously, pushing the washing flap valve to carry out transverse washing by water in the backflow water outlet channel under the action of water level difference, discharging washing water in three directions outside through the washing drain valve, and finally closing the gas washing valve and the washing drain valve, and continuing to run after washing is finished.
CN202310827874.3A 2023-07-06 2023-07-06 System and method for double-circulation treatment of secondary sedimentation tank effluent based on biological rotating disc filtration Active CN116675387B (en)

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CN111039406A (en) * 2019-12-30 2020-04-21 江苏汇合环保科技有限公司 Domestic sewage treatment system with biological rotating disc integrated with denitrification and dephosphorization and treatment process thereof
CN215756907U (en) * 2021-07-13 2022-02-08 长江大学 Integrated biological rotating disc device
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* Cited by examiner, † Cited by third party
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CN102515437A (en) * 2011-12-21 2012-06-27 江苏省环境科学研究院 Chemical industry park's wastewater bio-treatment apparatus and method thereof
CN104193087A (en) * 2014-07-25 2014-12-10 浩蓝环保股份有限公司 Catalytic oxidation slow percolation nitrogen and phosphorus removal device and method
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