CN113264645A - Domestic sewage treatment system and treatment method - Google Patents
Domestic sewage treatment system and treatment method Download PDFInfo
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- CN113264645A CN113264645A CN202110644834.6A CN202110644834A CN113264645A CN 113264645 A CN113264645 A CN 113264645A CN 202110644834 A CN202110644834 A CN 202110644834A CN 113264645 A CN113264645 A CN 113264645A
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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
- 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
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a domestic sewage treatment system, which comprises a rotational flow sand setting device, a biochemical system, an advanced treatment system, a disinfection system and a sludge disposal system, wherein the rotational flow sand setting device is connected with the biochemical system through a pipeline; the biochemical system comprises an anaerobic tank, an anoxic tank, an aerobic tank and a first sedimentation tank which are arranged in sequence according to the sewage flow direction, the advanced treatment system comprises a loading multi-effect clarification tank, and the loading multi-effect clarification tank is provided with a coagulation tank, a flocculation tank and a second sedimentation tank in sequence according to the sewage flow direction; the anoxic tank and the aerobic tank are both provided with a plurality of suspended fillers, the anoxic tank is internally provided with two submersible mixers, and the bottom of the aerobic tank is provided with a plurality of water distributors and a plurality of aeration devices which are arranged in a staggered manner. The effluent standard of the domestic sewage treatment system can realize the class-B, class-A and class-IV water standards of the quasi-surface according to the requirements of customers. And the construction speed is high, and the occupied area is small. The treatment scale was 15000m3When the water is used for a period of three months, the occupied area is only 5 mu, and the stable standard reaching of the effluent can be realized。
Description
Technical Field
The invention belongs to the field of domestic sewage treatment, and particularly relates to a domestic sewage treatment system and a domestic sewage treatment method.
Background
The Chinese invention patent CN201510516665.2 discloses a treatment system and a process for treating town sewage into four types of standard surface water, which comprises a grating tank, an aeration grit chamber, an AAO biochemical tank, a circular inlet and outlet rectangular secondary sedimentation tank, a biological contact oxidation tank, a high-density sedimentation tank, a D-shaped filter tank and an ultraviolet disinfection tank which are connected in sequence along the process; through the careful and reasonable design and the mutual combination of the units, the effluent quality of the surface water IV discharge standard can be realized, the process stability is good, the effluent quality is well guaranteed, meanwhile, in the sewage treatment process, the dosage is less, the produced sludge is less, the operation and maintenance cost of a sewage treatment system is lower, the requirement of the era of energy conservation and consumption reduction is met, the optimal unification of environmental benefit and economic benefit is well realized, and the device is suitable for being popularized and applied to sewage treatment projects with similar water quality requirements. However, the scheme of the invention has the advantages of multiple repetitive action units, long process nodes, large floor area, long construction time and incapability of meeting the project characteristics of tight time and heavy task of domestic sewage treatment and upgrading reconstruction engineering.
The Chinese patent application CN202010555017.9 discloses an integrated sewage treatment device and a sewage treatment method based on an A/O-MBBR process, which comprises a clarification tank, an anoxic tank, a primary aerobic tank, a secondary aerobic tank and a sedimentation tank which are connected in sequence through an overflow structure; the bottom of the sedimentation tank is provided with a power structure, the power structure is connected with the clarification tank through a return pipe, the return pipe is provided with a dephosphorization agent access port and a pipeline mixer, and the pipeline mixer is positioned at the downstream of the dephosphorization agent access port; the anoxic filler in the anoxic tank is a combined filler and is formed by wrapping polyurethane filler by a plastic spherical shell, and a carbon source medicament access port is arranged in a water inlet baffle plate of the anoxic tank; the aerobic fillers in the two aerobic tanks are respectively a high-density polyethylene MBBR filler and a PPC biological carrier; all parts are integrally installed in a shell, and the shell is made of glass fiber reinforced plastic. The sewage treatment equipment and the sewage treatment method adopt an A/O-MBBR pure biofilm process, have strong impact resistance, are matched with a chemical phosphorus removal and carbon source adding device, and can effectively enhance the removal of nitrogen and phosphorus pollutants. In the invention, an MBBR process is carried out after an AO unit, a sedimentation tank unit refluxes a nitrifying liquid to a clarification tank, and simultaneously a carbon source is added, and denitrification is started in an anoxic tank to remove nitrogen and phosphorus. However, the phosphorus and nitrogen removal effect of the scheme of the invention is poor due to the addition of the phosphorus and nitrogen removal agent in the biochemical treatment system, and the residual chemical agent influences the growth of microorganisms in the tank and further reduces the nitrogen and phosphorus removal effect because the phosphorus and phosphorus removal agent is added into the backflow pipe and flows back to the front end of the biochemical process. In addition, in the scheme of the invention, carbon sources need to be added, the sewage treatment capacity of the municipal domestic sewage treatment plant is large, the sewage treatment time is long, and the cost of the required carbon source medicament is higher under the condition of large water volume and long-time addition. Therefore, the scheme is also not suitable for upgrading and modifying municipal domestic sewage treatment plants.
Therefore, the prior art does not have a relatively ideal domestic sewage treatment system and a relatively ideal domestic sewage treatment method, and particularly relates to a domestic sewage treatment system and a domestic sewage treatment method for 'upgrading and transforming' of a sewage treatment plant.
Disclosure of Invention
Aiming at the emergency treatment of domestic sewage during upgrading and reconstruction, the invention aims to provide the assembly type emergency treatment system for upgrading and reconstruction of the domestic sewage, which has the advantages of high quality, high efficiency in the emergency treatment of upgrading and reconstruction of the domestic sewage, capability of realizing the primary B, primary A and quasi-surface IV water standards according to the requirements of customers and high quality standard, high construction speed, small occupied area, low investment cost and the like.
Therefore, the invention firstly provides a domestic sewage treatment system, which comprises a rotational flow grit chamber (2), a biochemical system (3), an advanced treatment system (4) and a disinfection system (5) which are arranged in sequence according to the sewage flow direction, and also comprises a sludge treatment system (6) for treating redundant sludge from the biochemical system (3) and the advanced treatment system (4); the biochemical system comprises an anaerobic tank (31), an anoxic tank (32), an aerobic tank (33) and a first sedimentation tank (34) which are arranged in sequence according to the sewage flow direction, the advanced treatment system (4) comprises a loading multi-effect clarification tank (40), and the loading multi-effect clarification tank (40) is provided with a coagulation tank (41), a flocculation tank (42) and a second sedimentation tank (43) in sequence according to the sewage flow direction; the anaerobic tank (32) and the aerobic tank (33) are respectively provided with a plurality of suspended fillers, the anaerobic tank is internally provided with two submersible mixers (35), the two submersible mixers are respectively arranged at the water inlet side and the water outlet side of the anaerobic tank and are arranged at different heights, the bottom of the aerobic tank is provided with a plurality of aeration devices (36) and a plurality of water distributors (37) for uniformly distributing the inlet water from the anaerobic tank in the aerobic tank, the plurality of water distributors and the plurality of aeration devices are arranged in a staggered manner, and the anaerobic tank, the aerobic tank and the first sedimentation tank are respectively provided with overflow weirs at the upper parts of the tanks; part of nitrifying liquid in the aerobic tank (33) flows back to the anoxic tank (32) through a nitrifying liquid return pipe, and part of sludge in the first sedimentation tank (34) flows back to the anaerobic tank (31) through a sludge return pipe; a first partition plate (410) extending from the top wall of the loading multi-effect clarification tank (40) to the top separates the coagulation tank from the flocculation tank, so that the sewage flows into the flocculation tank from the lower part or the bottom of the coagulation tank, a second partition plate (411) extending from the bottom plate of the loading multi-effect clarification tank (40) to the top separates the flocculation tank from the second sedimentation tank, so that the sewage flows into the second sedimentation tank from the upper part or the top of the flocculation tank, a sludge return pipe leading into the flocculation tank is arranged at the bottom of the second sedimentation tank, a funnel (49) with a valve is arranged at the top of the flocculation tank and used for adding the micro-sand into the flocculation tank, and the valve is used for controlling the adding speed of the micro-sand; the disinfection system (5) comprises a disinfection tank (51) and an ultraviolet disinfection canal (52) which are arranged in sequence according to the sewage flow direction and are used for adding chlorine-containing compounds for disinfection.
In a specific embodiment, the height of the submersible mixer on the water inlet side of the anoxic pond is set to be lower than the height of the submersible mixer on the water outlet side of the anoxic pond; preferably, the domestic sewage treatment system is a domestic sewage upgrading and modifying emergency treatment system.
In a specific embodiment, the suspended filler is a cylindrical filler, the height and the diameter of the suspended filler are both 0.5-4 cm, preferably the height and the diameter of the suspended filler are both 1-2 cm, and preferably the suspended filler is made of polypropylene.
In a specific embodiment, a first sewage pipe is arranged at the water inlet side of the anoxic pond, the inlet of the first sewage pipe is communicated with the water outlet of the overflow weir at the upper part of the anaerobic pond, the first sewage pipe is arranged to enable sewage to enter the first sewage pipe from the inlet and then to be conveyed downwards to the bottom or the lower part of the anoxic pond, and the outlet of the first sewage pipe is arranged at the bottom or the lower part of the anoxic pond.
In a specific embodiment, a second sewage pipe is arranged at the water outlet side of the anoxic pond or at the water inlet side of the aerobic pond, the inlet of the second sewage pipe is communicated with the upper part of the water outlet side of the anoxic pond, the second sewage pipe is arranged to convey sewage downwards to the bottom or the lower part of the aerobic pond after entering the second sewage pipe from the inlet, the outlet of the second sewage pipe is arranged at the bottom or the lower part of the aerobic pond, and the outlet of the second sewage pipe is directly or indirectly communicated with the water distributor.
In a specific embodiment, a submersible mixer (35) and an aeration device (36) are arranged in the anaerobic tank, a filter screen (310) is arranged below an overflow weir at the upper part of the aerobic tank, an inclined plate (38) is arranged below the overflow weir of the first sedimentation tank, and a sludge discharge pipe is arranged at the bottom of the first sedimentation tank and used for discharging residual sludge into a sludge disposal system; preferably, the sludge treatment system comprises a sludge concentration tank (61) and a sludge dewatering room (62) containing a screw-superposed dewaterer, residual sludge from the first sedimentation tank and the second sedimentation tank is firstly sent into the sludge concentration tank (61), after gravity sedimentation is carried out in the sludge concentration tank (61), supernatant is sent into a lifting pump room (1) in front of the cyclone sand-settling device (2) for retreatment, and lower layer sludge is sent into the sludge dewatering room (62) for dewatering.
In a specific embodiment, the advanced treatment system further comprises a medium recovery device (48) for recovering micro sand from the mixture of sludge and micro sand at the bottom of the second sedimentation tank (43), and the bottom of the second sedimentation tank is provided with a medium recovery pipe communicated with the medium recovery device (48).
In a specific embodiment, the second sedimentation tank comprises a pre-sedimentation region and an inclined tube separation region through which sewage flows in sequence, and inclined tube packing is arranged in the inclined tube separation region; preferably, the inclined tube separation zone is also provided with an overflow weir (47) positioned above the inclined tube filling, and the advanced treatment system also comprises an outlet channel (44), wherein the outlet channel (44) is arranged beside the overflow weir at the upper part of the second sedimentation tank.
In a specific embodiment, a first stirring mechanism (45) and a second stirring mechanism (46) are respectively arranged in the coagulation tank and the flocculation tank, and the top parts of the coagulation tank and the flocculation tank are respectively provided with a dosing port; preferably, the funnel (49) is arranged on the top plate of the loading multi-effect clarification tank on the water inlet side of the flocculation tank (42).
The invention also provides a domestic sewage treatment method, which comprises the steps of treating domestic sewage by using the domestic sewage treatment system; preferably, sewage collected by the sewage pipe network is subjected to impurity removal through a grating and then enters a cyclone sand setting device to remove gravel, then enters a biochemical system to be treated, effluent of a first sedimentation tank in the biochemical system enters an advanced treatment system to be subjected to advanced treatment, and effluent of a second sedimentation tank enters a disinfection system to be disinfected and then is discharged after reaching the standard; preferably, the coagulation tank and the flocculation tank are intermittently stirred, the sludge reflux amount from the second sedimentation tank to the flocculation tank is adjusted to enable the sludge concentration of the flocculation tank to reach 3-5g/L, and the adding speed of the medium micro-sand in the flocculation tank is controlled in real time by controlling the opening degree of a valve at a funnel (49).
The invention also provides a biochemical system for treating domestic sewage, which comprises an anaerobic tank (31), an anoxic tank (32), an aerobic tank (33) and a first sedimentation tank (34) which are arranged in sequence according to the sewage flow direction, wherein a plurality of suspended fillers are arranged in the anoxic tank (32) and the aerobic tank (33), two submersible mixers (35) are arranged in the anoxic tank, the two submersible mixers are respectively arranged at the water inlet side and the water outlet side of the anoxic tank, the two submersible mixers are arranged at different heights, a plurality of aeration devices (36) and a plurality of water distributors (37) for uniformly distributing the inlet water from the anoxic tank in the aerobic tank are arranged at the bottom of the aerobic tank, and overflow weirs are arranged at the upper parts of the anaerobic tank, the aerobic tank and the first sedimentation tank.
In a specific embodiment, the height of the submersible mixer on the water inlet side of the anoxic tank is set to be lower than the height of the submersible mixer on the water outlet side of the anoxic tank.
In a specific embodiment, the suspended filler is a cylindrical filler, and the height and the diameter of the suspended filler are both 0.5-4 cm.
In a specific embodiment, the height and the diameter of the suspended filler are both 1-2 cm.
In a specific embodiment, the material of the suspended filler is polypropylene.
In a specific embodiment, a first sewage pipe is arranged at the water inlet side of the anoxic pond, the inlet of the first sewage pipe is communicated with the water outlet of the overflow weir at the upper part of the anaerobic pond, the first sewage pipe is arranged to enable sewage to enter the first sewage pipe from the inlet and then to be conveyed downwards to the bottom or the lower part of the anoxic pond, and the outlet of the first sewage pipe is arranged at the bottom or the lower part of the anoxic pond.
In a specific embodiment, a second sewage pipe is arranged at the water outlet side of the anoxic pond or at the water inlet side of the aerobic pond, the inlet of the second sewage pipe is communicated with the upper part of the water outlet side of the anoxic pond, the second sewage pipe is arranged to convey sewage downwards to the bottom or the lower part of the aerobic pond after entering the second sewage pipe from the inlet, the outlet of the second sewage pipe is arranged at the bottom or the lower part of the aerobic pond, and the outlet of the second sewage pipe is directly or indirectly communicated with the water distributor.
In a specific embodiment, a plurality of water distributors and a plurality of aeration devices at the bottom of the aerobic tank are arranged in a staggered manner.
In a specific embodiment, a nitrifying liquid return pipe is arranged in the aerobic tank, and a return pump is correspondingly arranged for returning part of nitrifying liquid to the anoxic tank; and a sludge return pipe is arranged in the first sedimentation tank, and a return pump is correspondingly arranged and used for returning partial sludge to the anaerobic tank.
In a specific embodiment, a submersible mixer (35) and an aeration device (36) are arranged in the anaerobic tank, a filter screen (310) is arranged below an overflow weir at the upper part of the aerobic tank, an inclined plate (38) is arranged below the overflow weir of the first sedimentation tank, and a sludge discharge pipe is arranged at the bottom of the first sedimentation tank and used for discharging residual sludge into a sludge disposal system.
The invention also provides an advanced treatment system for treating domestic sewage, the advanced treatment system (4) comprises a loading multi-effect clarification tank (40), the loading multi-effect clarification tank (40) is provided with a coagulation tank (41), a flocculation tank (42) and a second sedimentation tank (43) in sequence according to the sewage flow direction, a first clapboard (410) extending from the top wall of the loading multi-effect clarification tank (40) from top to bottom separates the coagulation tank from the flocculation tank, so that the sewage flows into the flocculation tank from the lower part or the bottom of the coagulation tank, the second clapboard (411) extending from the bottom plate loaded with the multi-effect clarification tank (40) from bottom to top separates the flocculation tank from the second sedimentation tank, so that the sewage flows into the second sedimentation tank from the upper part or the top of the flocculation tank, and a funnel (49) with a valve is arranged at the top of the flocculation tank and used for adding the micro-sand into the flocculation tank, and the valve is used for controlling the adding speed of the micro-sand.
In a specific embodiment, a sludge return pipe which is led into the flocculation tank is arranged at the bottom of the second sedimentation tank.
In a specific embodiment, the advanced treatment system further comprises a medium recovery device (48) for recovering micro sand from the mixture of sludge and micro sand at the bottom of the second sedimentation tank (43), and the bottom of the second sedimentation tank is provided with a medium recovery pipe communicated with the medium recovery device (48).
In a specific embodiment, the second sedimentation tank comprises a pre-sedimentation region and an inclined tube separation region through which sewage flows in sequence, and inclined tube packing is arranged in the inclined tube separation region.
In a specific embodiment, the pipe chute separation zone is further provided with an overflow weir (47) above the pipe chute packing, and the advanced treatment system further comprises an outlet channel (44), wherein the outlet channel (44) is arranged beside the overflow weir at the upper part of the second sedimentation tank.
In a specific embodiment, a first stirring mechanism (45) and a second stirring mechanism (46) are respectively arranged in the coagulation tank and the flocculation tank, and the top parts of the coagulation tank and the flocculation tank are respectively provided with a dosing port.
In a specific embodiment, the funnel (49) is arranged on the top plate of the loading multi-effect clarification tank on the water inlet side of the flocculation tank (42).
The invention also provides an anoxic tank for water treatment, wherein the inflow water in the anoxic tank (32) comes from the anaerobic tank (31) at the front end of the anoxic tank, the outflow water in the anoxic tank (32) enters the aerobic tank (33) at the rear end of the anoxic tank, a plurality of suspended fillers are arranged in the anoxic tank (32), two submersible mixers (35) are arranged in the anoxic tank, the two submersible mixers are respectively arranged at the inflow side and the outflow side of the anoxic tank, and the two submersible mixers are arranged at different heights.
In a specific embodiment, the height of the submersible mixer on the water inlet side of the anoxic tank is set to be lower than the height of the submersible mixer on the water outlet side of the anoxic tank.
In a specific embodiment, the suspended filler is a cylindrical filler, and the height and the diameter of the suspended filler are both 0.5-4 cm.
In a specific embodiment, the height and the diameter of the suspended filler are both 1-2 cm.
In a specific embodiment, the material of the suspended filler is polypropylene.
In a specific embodiment, a first sewage pipe is arranged at the water inlet side of the anoxic pond, the inlet of the first sewage pipe is communicated with the water outlet of the overflow weir at the upper part of the anaerobic pond, the first sewage pipe is arranged to enable sewage to enter the first sewage pipe from the inlet and then to be conveyed downwards to the bottom or the lower part of the anoxic pond, and the outlet of the first sewage pipe is arranged at the bottom or the lower part of the anoxic pond.
In a specific embodiment, the outlet side of the anoxic tank is provided with a second sewage pipe, the inlet of the second sewage pipe is communicated with the upper part of the outlet side of the anoxic tank, the second sewage pipe is arranged to convey sewage downwards to the bottom or the lower part of the aerobic tank after entering the second sewage pipe from the inlet, and the outlet of the second sewage pipe is arranged at the bottom or the lower part of the aerobic tank.
The invention also provides an aerobic tank for water treatment, wherein the inlet water in the aerobic tank (33) comes from an anoxic tank (32) at the front end of the aerobic tank, the outlet water in the aerobic tank (33) enters a first sedimentation tank (34) at the rear end of the aerobic tank, a plurality of suspended fillers (39) are arranged in the aerobic tank (33), a plurality of aeration devices (36) and a plurality of water distributors (37) for enabling the inlet water from the anoxic tank to be uniformly distributed in the aerobic tank are arranged at the bottom of the aerobic tank, an overflow weir is arranged at the upper part of the aerobic tank (33) and above the suspended fillers, and the outlet water of the aerobic tank flows to the first sedimentation tank (34) from the overflow weir.
In a specific embodiment, a plurality of water distributors and a plurality of aeration devices at the bottom of the aerobic tank are arranged in a staggered manner.
In a specific embodiment, a second sewage pipe is arranged at the water inlet side of the aerobic pool, the inlet of the second sewage pipe is communicated with the upper part of the water outlet side of the anoxic pool, the second sewage pipe is arranged to convey sewage downwards to the bottom or the lower part of the aerobic pool after entering the second sewage pipe from the inlet, the outlet of the second sewage pipe is arranged at the bottom or the lower part of the aerobic pool, and the outlet of the second sewage pipe is directly or indirectly communicated with the water distributor.
In a specific embodiment, a nitrifying liquid return pipe is arranged in the aerobic tank, and a return pump is correspondingly arranged for returning part of nitrifying liquid to the anoxic tank.
In a specific embodiment, a filter screen (310) is arranged below an overflow weir at the upper part of the aerobic tank.
In a specific embodiment, the overflow weir of the aerobic tank is configured to overflow the sewage into the first sedimentation tank from top to bottom directly from the overflow weir after the sewage passes through the overflow weir.
In a specific embodiment, the suspended filler is a cylindrical filler, and the height and the diameter of the suspended filler are both 0.5-4 cm.
In a specific embodiment, the height and the diameter of the suspended filler are both 1-2 cm.
In a specific embodiment, the material of the suspended filler is polypropylene.
Compared with the prior art, the invention has the following beneficial effects:
1) the effluent standard of the domestic sewage treatment system can realize the class-B, class-A and class-IV water standards of the quasi-surface according to the requirements of customers. Specifically, the invention does not need to add any chemical agent such as a phosphorus removal agent and the like into the biochemical system, combines the AAO process and the MBBR process to form the biochemical system of the invention, and realizes the phosphorus removal effect in the advanced treatment system behind the biochemical system.
2) The domestic sewage treatment system disclosed by the invention is high in construction speed and small in occupied area. The treatment scale was 15000m3And d, the water treatment agent can be used for only three months, so that the whole period from field leveling to stable effluent standard reaching of system operation can be completed, and the occupied area is only 5 mu. Particularly, the domestic sewage treatment system and the treatment method adopt the combination of the grating and the rotational flow grit chamber, so that the occupied area is small; the biochemical system combines the AAO process and the MBBR process, so that the process units are few, and the treatment effects are superposed; the deep treatment system adopts a loading multi-effect clarification tank to efficiently load and precipitate, has high treatment efficiency and can perform modular assembly type treatment.
3) The domestic sewage treatment system and the method adopt the assembly type construction, noise reduction and deodorization are carried out by multiple measures, ecological environment protection is ensured, no secondary pollution is caused, and an ecological environment-friendly living environment is provided for surrounding residents.
Drawings
FIG. 1 is a schematic view showing the structure and flow of a domestic sewage treatment system according to the present invention.
FIG. 2 is a schematic structural diagram of the biochemical system according to the present invention.
FIG. 3 is a schematic structural diagram of the advanced treatment system according to the present invention.
In the figure: 31-anaerobic tank, 32-anoxic tank, 33-aerobic tank, 34-sedimentation tank, 35-submersible mixer, 36-aeration device, 37-water distributor, 38-inclined plate, 39-suspended filler and 310-filter screen. 41-a coagulation tank, 42-a flocculation tank, 43-a sedimentation tank, 44-an outlet channel, 45-a first stirring mechanism, 46-a second stirring mechanism, 47-an overflow weir, 48-a medium recovery device, 49-a funnel, 410 a first partition board and 411-a second partition board.
Detailed Description
The invention provides an assembly type domestic sewage upgrading and transforming emergency treatment system, and the process flow is shown in attached figure 1. The block diagrams of the biochemical system and the deep processing system in fig. 1 are specifically shown in fig. 2 and 3. Aiming at the emergency treatment of domestic sewage in the upgrading and transformation period of a municipal sewage treatment plant, the main pollutants in the sewage are organic matters, ammonia nitrogen, total phosphorus and the like. The system combines biochemical treatment and advanced treatment process, is built in an industrialized mode, is standardized, generalized and assembled, runs automatically, is managed in an informatization mode, and has the advantages of being high in quality standard, high in building speed, small in occupied area, low in investment cost and the like.
The technical scheme of the invention is as follows:
an emergency treatment system and a treatment method for standard improvement and reconstruction of assembled domestic sewage comprise the following steps:
s1, the sewage collected by the sewage pipe network firstly enters the lift pump room. Set up thick grid and elevator pump in the elevator pump room, the first process of thick grid as preliminary treatment sets up before the elevator pump, can effectively get rid of impurity such as plastics, paper and less suspended solid, prevents that pump and pipeline from being worn and torn or blockking up. The coarse grating is a rotary grating machine, the grating width B is 1000mm, and the grating gap B is 10mm, so that the integrated construction is met, and the sewage treatment requirement is met.
S2, lifting the sewage to a fine grid tank by the lifting action of a lifting pump, removing fine suspended matters in the sewage, and then feeding the sewage into a fine grid tankAnd (5) entering a cyclone sand setting device to remove gravel. The fine grid is also a rotary grid machine, the grid width B is 800mm, and the grid gap B is 5 mm. The cyclone sand settling device mainly removes fine floating objects in raw water and sewage with the particle size of more than 0.2mm and the density of more than 2.65t/m3The sand grains of (1).
And S3, the sewage filtered by the fine grid enters a biochemical system. The biochemical system combines the characteristics of an AAO process (namely an anaerobic-anoxic-aerobic method) and an MBBR process (moving bed biofilm reactor), and consists of an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank. The anaerobic tank and the aerobic tank are respectively added with a certain amount of polypropylene plastic cylindrical suspended filler, the suspended filler has relatively light self weight, good hydrophilicity and higher specific surface area, and can effectively improve the biomass and the biological species in the anaerobic tank and the aerobic tank, thereby improving the sewage treatment efficiency. The suspension filler can be directly obtained commercially, is approximately cylindrical, and has the diameter and the height of 1-2 cm. The adding amount of the suspended filler can be determined by the specific working conditions in the anoxic tank and the aerobic tank.
The anaerobic tank is internally provided with a submersible mixer, the anoxic tank is internally provided with two submersible mixers, and the bottom of the aerobic tank is provided with a water distributor and an aeration device. Two dive mixers in the oxygen deficiency pond set up in opposite direction, the income water side and the play water side in oxygen deficiency pond promptly, and two dive mixers set up at co-altitude not, and the mass transfer of guarantee oxygen deficiency pond internal waste mixes, increases the circulation of oxygen deficiency pond internal waste water, prevents suspended filler agglomeration and deposit simultaneously. The water distributors and the aeration devices at the bottom of the aerobic tank are arranged in a staggered manner, wastewater enters the sewage pipe from the upper part of the anoxic tank, is conveyed downwards to the water distribution main trunk pipe at the bottom of the aerobic tank through the sewage pipe, and then flows into the water distribution pipes staggered with the aeration devices from the main trunk pipe, the wastewater enters the aerobic tank from the water distribution pipes and the water distributors, the water distributors and the aeration devices are arranged in a staggered manner, so that the uniform reaction of water, gas and fillers in the aerobic tank is facilitated, and the wastewater treatment efficiency is maximized. A reflux pump is arranged in the aerobic tank, part of nitrified liquid flows back to the anoxic tank, and part of sludge generated by the sedimentation tank flows back to the anaerobic tank through another reflux pump. Through the sludge reflux and nitrification liquid reflux process, the biochemical treatment effect is enhanced, the concentration of the activated sludge is effectively improved, and the treatment load of other treatment units is reduced. The ingenious structural design in the biochemical system of the invention obviously improves the oxygen transfer efficiency; under the dual effects of high sludge concentration and high reaction efficiency, the biochemical reaction speed is greatly accelerated, so that the hydraulic retention time is obviously shortened. And the sewage in the anaerobic tank flows to the anoxic tank and the sewage in the aerobic tank flows to the sedimentation tank, and the sewage enters the next tank through an overflow weir at the upper part of the tank. The sedimentation mode in the sedimentation tank adopts inclined tube sedimentation. The oxygen-poor tank is not provided with an overflow weir, but the anaerobic tank, the aerobic tank and the first sedimentation tank are all provided with overflow weirs at the upper parts of the tanks. And a filter screen is arranged below the overflow weir at the upper part of the aerobic tank, and the filter screen is horizontally arranged to prevent the filler from running off. After passing through the overflow weir at the upper part of the anaerobic tank, the sewage is also conveyed downwards to the bottom or the lower part of the anoxic tank through the sewage pipe and enters the anoxic tank from the bottom or the lower part of the anoxic tank. After passing through the overflow weir at the upper part of the aerobic tank, the sewage directly overflows from the overflow weir to the first sedimentation tank from top to bottom. The inclined plate in the first sedimentation tank is arranged below the overflow weir of the first sedimentation tank, and sewage overflowing from the overflow weir of the first sedimentation tank enters the advanced treatment system 4 for further treatment.
In addition to the need of aeration in the aerobic tank, although the oxygen demand of the anaerobic tank is small, an aeration mechanism is also needed for carrying out intermittent aeration on the aerobic tank, and the aeration mechanism is used for providing oxygen for the anaerobic tank and simultaneously mixing sewage in the tank.
And S4, allowing effluent of the biochemical system to enter an advanced treatment system for advanced treatment, wherein the advanced treatment system adopts a loading multi-effect clarification process (CRHIC-SED). SS and TP are further removed within the advanced processing system. The advanced treatment system corresponding to the loading multi-effect clarification process (CRHIC-SED) comprises a coagulation tank (41), a flocculation tank (42) and a second sedimentation tank (43) comprising a pre-sedimentation area and an inclined tube separation area, wherein 90% of flocs from the flocculation reaction tank are precipitated and concentrated in the pre-sedimentation area before entering the inclined tube separation area. All set up rabbling mechanism in coagulating basin and the flocculation basin, and coagulating basin and flocculation basin top all set up with the medicine mouth. A first partition 410 from the top wall separates the coagulation basin from the flocculation basin, and a second partition 411 from the bottom wall separates the flocculation basin from the sedimentation basin. The sewage in the second sedimentation tank flows through the pre-sedimentation zone and the inclined tube separation zone in sequence, and the clean water in the second sedimentation tank flows out of the overflow weir above the inclined tube and enters the disinfection system 5 for disinfection.
As the effluent of the biochemical system is greatly reduced in suspended matters compared with the influent, the effluent of the biochemical system is in a turbid state mainly due to high turbidity, small particle size and light weight in water, and floc sediment with larger volume is difficult to form. Therefore, after a large number of experiments, the loading multi-effect clarification process is improved as follows: 1. when the PAM agent is replaced, the molecular weight of the flocculant is obviously increased to 1600 ten thousand compared with the original molecular weight. 2. The stirring frequency in the coagulation tank and the flocculation tank is reduced by an intermittent stirring method, and the area of blades of the stirring mechanism is properly reduced. 3. The sludge return flow from the second sedimentation tank to the flocculation tank is moderately increased, so that the sludge concentration of the flocculation tank reaches about 3-5 g/L. 4. The density of the floc in the flocculation tank is further increased by adding the micro-sand in the flocculation tank; and the top of the flocculation tank is provided with a funnel device with a valve for adding the micro-sand, the adding speed of the micro-sand is controlled by the valve, the micro-sand can be slowly added according to the water quality condition of the flocculation tank, the micro-sand can be ensured to agglomerate with flocs, and the flocs can be effectively prevented from being scattered due to the strong impact on the flocs caused by adding a large amount of micro-sand in a short time. The vast majority of the sludge discharged from the bottom of the second sedimentation tank enters a medium recovery device through a medium recovery pipeline to be used for recovering medium micro-sand, the recovery rate of the micro-sand reaches about 95%, and the medium recovery device can adopt a spiral-flow device and separates the micro-sand from the sludge according to the principle that the density of the micro-sand is greater than that of the sludge. The media recovery device may be directly commercially available. The micro-sand is fine sand after screening, and can be obtained by commercial products. The sludge separated in the medium recovery device is discharged into the sludge disposal system 6, a small part of the sludge discharged from the bottom of the second sedimentation tank returns to the flocculation tank through a sludge return pipeline, and in addition, a small amount of sludge is directly discharged into the sludge disposal system 6 through a sludge discharge pipeline without medium recovery.
S5, disinfecting the sewage discharged from the advanced treatment system in a disinfection tank, adding sodium hypochlorite into the disinfection tank, feeding the effluent of the disinfection tank into an ultraviolet disinfection channel, enhancing disinfection through ultraviolet rays, and enabling the effluent to reach the discharge standard and discharge after reaching the standard. And the sodium hypochlorite is added through a dosing room communicated with a dosing pump. According to the invention, the escherichia coli in the effluent is killed through the double sterilization and disinfection of sodium hypochlorite and ultraviolet rays, so that the emission reaching the standard is realized.
And S6, discharging the residual sludge generated in the steps S3 and S4 to a sludge concentration tank, performing gravity concentration, enabling the supernatant to flow into the lifting pump room 1, conveying the residual sludge to a screw-stacking dehydrator of the sludge dehydration room 62 by using a screw pump, performing sludge dehydration, conveying the dehydrated sludge to a sludge hopper for temporary storage by using a conveyor, and finally transporting the sludge to a third-party sludge treatment unit for external disposal after a certain amount of sludge is temporarily stored.
Furthermore, all process units of the system can be manufactured in a factory, built in a standardized, generalized and assembled manner, and normal operation treatment of sewage can be rapidly realized.
Further, the system is provided with a dosing room which is respectively communicated with a loading multi-effect clarification process (CRHIC-SED) and a subsequent disinfection process of the advanced treatment system. And a coagulant polyaluminium chloride (PAC) is added into the coagulation tank loaded with the multi-effect clarification process (CRHIC-SED), and a flocculating agent Polyacrylamide (PAM) is added into the flocculation tank.
Furthermore, the main process of the system adopts a steel plate structure and a carbon steel material, and the auxiliary design adopts a steel concrete structure. The scale treatment can be realized, the occupied area is saved, and the noise and odor influence is reduced from the structural aspect.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The domestic sewage treatment system is characterized by comprising a rotational flow grit chamber (2), a biochemical system (3), an advanced treatment system (4) and a disinfection system (5) which are arranged in sequence according to the sewage flow direction, and further comprising a sludge treatment system (6) for treating redundant sludge from the biochemical system (3) and the advanced treatment system (4); the biochemical system comprises an anaerobic tank (31), an anoxic tank (32), an aerobic tank (33) and a first sedimentation tank (34) which are arranged in sequence according to the sewage flow direction, the advanced treatment system (4) comprises a loading multi-effect clarification tank (40), and the loading multi-effect clarification tank (40) is provided with a coagulation tank (41), a flocculation tank (42) and a second sedimentation tank (43) in sequence according to the sewage flow direction; the anaerobic tank (32) and the aerobic tank (33) are respectively provided with a plurality of suspended fillers, the anaerobic tank is internally provided with two submersible mixers (35), the two submersible mixers are respectively arranged at the water inlet side and the water outlet side of the anaerobic tank and are arranged at different heights, the bottom of the aerobic tank is provided with a plurality of aeration devices (36) and a plurality of water distributors (37) for uniformly distributing the inlet water from the anaerobic tank in the aerobic tank, the plurality of water distributors and the plurality of aeration devices are arranged in a staggered manner, and the anaerobic tank, the aerobic tank and the first sedimentation tank are respectively provided with overflow weirs at the upper parts of the tanks; part of nitrifying liquid in the aerobic tank (33) flows back to the anoxic tank (32) through a nitrifying liquid return pipe, and part of sludge in the first sedimentation tank (34) flows back to the anaerobic tank (31) through a sludge return pipe; a first partition plate (410) extending from the top wall of the loading multi-effect clarification tank (40) to the top separates the coagulation tank from the flocculation tank, so that the sewage flows into the flocculation tank from the lower part or the bottom of the coagulation tank, a second partition plate (411) extending from the bottom plate of the loading multi-effect clarification tank (40) to the top separates the flocculation tank from the second sedimentation tank, so that the sewage flows into the second sedimentation tank from the upper part or the top of the flocculation tank, a sludge return pipe leading into the flocculation tank is arranged at the bottom of the second sedimentation tank, a funnel (49) with a valve is arranged at the top of the flocculation tank and used for adding the micro-sand into the flocculation tank, and the valve is used for controlling the adding speed of the micro-sand; the disinfection system (5) comprises a disinfection tank (51) and an ultraviolet disinfection canal (52) which are arranged in sequence according to the sewage flow direction and are used for adding chlorine-containing compounds for disinfection.
2. The domestic sewage treatment system of claim 1 wherein the submersible mixer on the water inlet side of said anoxic tank is set to a height lower than the submersible mixer on the water outlet side thereof; preferably, the domestic sewage treatment system is a domestic sewage upgrading and modifying emergency treatment system.
3. The domestic sewage treatment system of claim 1, wherein the suspended filler is a cylindrical filler, the height and the diameter of the suspended filler are both 0.5-4 cm, preferably the height and the diameter of the suspended filler are both 1-2 cm, and preferably the suspended filler is made of polypropylene.
4. The domestic sewage treatment system of any one of claims 1 to 3, wherein a first sewage pipe is arranged at the water inlet side of the anoxic tank, the inlet of the first sewage pipe is communicated with the water outlet of the overflow weir at the upper part of the anaerobic tank, the first sewage pipe is arranged to convey sewage downwards to the bottom or the lower part of the anoxic tank after entering the first sewage pipe from the inlet, and the outlet of the first sewage pipe is arranged at the bottom or the lower part of the anoxic tank.
5. The domestic sewage treatment system of any one of claims 1 to 4, wherein a second sewage pipe is arranged at the water outlet side of the anoxic tank or at the water inlet side of the aerobic tank, the inlet of the second sewage pipe is communicated with the upper part of the water outlet side of the anoxic tank, the second sewage pipe is arranged so that sewage enters the second sewage pipe from the inlet and then is conveyed downwards to the bottom or the lower part of the aerobic tank, the outlet of the second sewage pipe is arranged at the bottom or the lower part of the aerobic tank, and the outlet of the second sewage pipe is directly or indirectly communicated with the water distributor.
6. The domestic sewage treatment system according to any of claims 1 to 5, wherein a submersible mixer (35) and an aeration device (36) are provided in the anaerobic tank, a filter screen (310) is provided below an overflow weir at the upper part of the aerobic tank, an inclined plate (38) is provided below the overflow weir of the first sedimentation tank, and a sludge discharge pipe is further provided at the bottom of the first sedimentation tank for discharging excess sludge into a sludge disposal system; preferably, the sludge treatment system comprises a sludge concentration tank (61) and a sludge dewatering room (62) containing a screw-superposed dewaterer, residual sludge from the first sedimentation tank and the second sedimentation tank is firstly sent into the sludge concentration tank (61), after gravity sedimentation is carried out in the sludge concentration tank (61), supernatant is sent into a lifting pump room (1) in front of the cyclone sand-settling device (2) for retreatment, and lower layer sludge is sent into the sludge dewatering room (62) for dewatering.
7. The domestic sewage treatment system according to claim 1, wherein said advanced treatment system further comprises a media recovery device (48) for recovering micro-sand from a mixture of sludge and micro-sand in the bottom of the second sedimentation tank (43), the bottom of said second sedimentation tank being provided with a media recovery pipe communicating with the media recovery device (48).
8. The domestic sewage treatment system of claim 1, wherein the second sedimentation tank comprises a pre-sedimentation region and a pipe chute separation region through which sewage flows in sequence, and pipe chute fillers are arranged in the pipe chute separation region; preferably, the inclined tube separation zone is also provided with an overflow weir (47) positioned above the inclined tube filling, and the advanced treatment system also comprises an outlet channel (44), wherein the outlet channel (44) is arranged beside the overflow weir at the upper part of the second sedimentation tank.
9. The domestic sewage treatment system of claim 1, wherein the coagulation tank and the flocculation tank are respectively provided with a first stirring mechanism (45) and a second stirring mechanism (46), and the top parts of the coagulation tank and the flocculation tank are respectively provided with a dosing port; preferably, the funnel (49) is arranged on the top plate of the loading multi-effect clarification tank on the water inlet side of the flocculation tank (42).
10. A domestic sewage treatment method comprising treating domestic sewage with the domestic sewage treatment system according to any one of claims 1 to 9; preferably, sewage collected by the sewage pipe network is subjected to impurity removal through a grating and then enters a cyclone sand setting device to remove gravel, then enters a biochemical system to be treated, effluent of a first sedimentation tank in the biochemical system enters an advanced treatment system to be subjected to advanced treatment, and effluent of a second sedimentation tank enters a disinfection system to be disinfected and then is discharged after reaching the standard; preferably, the coagulation tank and the flocculation tank are intermittently stirred, the sludge reflux amount from the second sedimentation tank to the flocculation tank is adjusted to enable the sludge concentration of the flocculation tank to reach 3-5g/L, and the adding speed of the medium micro-sand in the flocculation tank is controlled in real time by controlling the opening degree of a valve at a funnel (49).
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| CN114772858A (en) * | 2022-04-28 | 2022-07-22 | 中海环境科技(上海）股份有限公司 | Equipment and method for treating water body of light and medium eutrophication artificial landscape lake |
| CN114772785A (en) * | 2022-04-29 | 2022-07-22 | 中国铁建重工集团股份有限公司 | Integrated sewage treatment device and method |
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