CN111960618A

CN111960618A - Overlapping and splicing sewage treatment equipment and method for coastal region quasi-IV water

Info

Publication number: CN111960618A
Application number: CN202010880140.8A
Authority: CN
Inventors: 汪君晖; 梁伦硕; 姚海军; 陈珣; 盘章俊; 陈明翠; 屈红
Original assignee: Chongqing Neide Environmental Technology Co ltd
Current assignee: Chongqing Neide Environmental Technology Co ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-11-20

Abstract

The invention provides a splicing sewage treatment device and method for reaching quasi-IV water in coastal areas, wherein the device comprises a grid well, a water collecting tank, a coagulating sedimentation tank, an integrated sewage treatment device, an ozone contact tank and a sodium hypochlorite disinfection tank which are sequentially communicated, wherein the integrated sewage treatment device comprises an anaerobic zone, a primary anoxic zone, a primary aerobic zone, a secondary anoxic zone, a secondary aerobic zone and a membrane zone which are sequentially communicated, the integrated sewage treatment device also comprises a device room, and a clear water tank is also arranged in the device room. The device is suitable for sewage treatment in coastal areas, and has the advantages of small occupied area, low energy consumption, low investment and operation cost, effluent quality reaching the standard IV water, and simple and convenient operation and maintenance. The invention also provides a process method for treating sewage in coastal areas, and the effluent reaches the quasi IV class.

Description

Overlapping and splicing sewage treatment equipment and method for coastal region quasi-IV water

Technical Field

The invention belongs to the technical field of water pollution treatment, and particularly relates to splicing sewage treatment equipment and method for reaching quasi-IV water in coastal areas.

Background

At present, sewage treatment plants mostly implement state-relevant emission standards. And the lowest standard of surface water is V-type water according to the requirements in the water area function and classification standard. The main indexes in the two standards are compared, so that the existing discharge standard is inferior to the surface water V-type standard, and the potential of aggravating the water body environment deterioration still exists. Therefore, the discharge standards of sewage treatment plants are being upgraded to surface level class IV water, which has gradually become an industry trend.

A process technology of urban sewage treatment plants is generally adopted²O, oxidation ditch, SBR and the like, and the standard-extracting and standard-modifying IV water mostly expands the original tank volume on the basis of the original process and adds advanced treatment processes, such as a denitrification filter tank, an advanced oxidation and high-density sedimentation tank and the like. The technology often needs to build a new soil structure, and has the defects of extremely large occupied area, complex structure of the structure, long construction period, high construction difficulty, complex operation and maintenance, unstable effluent quality and the like. In coastal areas, due to the shortage of land resources, the floor space of sewage plants is limited, and the influence of chlorine ions contained in the air on the material of power equipment is not suitable for adopting the upgrading and reconstruction process.

In recent years, integrated sewage treatment equipment is widely applied to treatment of distributed sewage due to the advantages of small occupied area, high integration degree, convenience in field installation, short installation period and the like. However, the process techniques are mostly conventional A²The water quality of the effluent of the/O or MBR process cannot reach the standard of quasi-IV water, so the application of the process in the field is limited.

Disclosure of Invention

Therefore, the invention aims to overcome the defects of the prior art and provide the sewage treatment method and the integrated equipment which are suitable for sewage treatment in coastal areas, have small occupied area, low energy consumption, low investment and operation cost, have the effluent quality reaching the IV class water and are simple and convenient to operate and maintain. The invention provides a process method for treating sewage, which solves the problem of sewage treatment in coastal areas and ensures that the effluent reaches the quasi-IV class. The invention also provides a splicing type integrated sewage treatment device for reaching the IV-class water in the coastal region.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a coastal area reaches folding sewage treatment device of piecing together of accurate IV class water, includes grid well, catch basin, coagulating sedimentation tank, integration sewage treatment device, ozone contact tank and the sodium hypochlorite disinfection pond that communicates in order, wherein integration sewage treatment device is including the anaerobic zone, one-level anoxic zone, one-level aerobic zone, second grade anoxic zone, second grade aerobic zone and the membrane area that communicate in order, wherein integration sewage treatment device still includes between the equipment, still be equipped with the clear water case between the equipment, the delivery port of membrane area with the clear water case intercommunication.

On the basis of the technical scheme, the invention can further have the following specific selection or optimized selection.

Specifically, the anaerobic zone lower part is equipped with the inlet tube, and upper portion is equipped with the intercommunication the delivery port in one-level anoxic zone, the inlet tube is laid to the I shape, and evenly distributed has the inlet opening, the inlet tube in anaerobic zone with coagulating sedimentation pond intercommunication, anaerobic zone lateral wall top is equipped with the overflow pipe, and the bottom is equipped with the blow-down pipe, has still arranged along its lateral wall inboard and has overhauld the cat ladder.

Specifically, the submerged stirrers are arranged at the diagonal positions of the bottoms of the primary anoxic zone and the secondary anoxic zone, a first water outlet hole is formed in the position, 200 mm away from the bottom wall, of the side wall of the primary anoxic zone, the first water outlet hole is communicated with the primary aerobic zone, a second water outlet hole is formed in the position, 200 mm away from the bottom wall, of the side wall of the secondary anoxic zone, the second water outlet hole is communicated with the secondary aerobic zone. The first-stage anoxic zone and the second-stage anoxic zone are both top overflow water inlet.

Specifically, the second-stage anoxic zone is provided with a first reflux pump, a sludge inlet of the first reflux pump is communicated with the second-stage anoxic zone, and a sludge outlet of the first reflux pump is communicated with the anaerobic zone.

Specifically, the bottom of each of the first-stage aerobic zone and the second-stage aerobic zone is provided with an aerator pipe and an emptying pipe, the water outlet of the first-stage aerobic zone is communicated with the second-stage anoxic zone, the water outlet of the second-stage aerobic zone is communicated with the membrane zone, the first-stage aerobic zone is provided with a second reflux pump, the sludge inlet of the second reflux pump is communicated with the first-stage aerobic zone, and the sludge outlet is communicated with the first-stage anoxic zone.

Specifically, the membrane area is provided with a membrane assembly, a water outlet of the membrane area is communicated with the clear water tank, and the membrane area is further provided with a third reflux pump which is used for conveying sludge to the first aerobic area.

Specifically, a back-washing pump is arranged in the clean water tank and used for back-washing the membrane components of the membrane area by using clean water of the clean water tank, specifically, a water inlet of the back-washing pump is communicated with the clean water tank, and a water outlet of the back-washing pump is aligned with the membrane components of the membrane area.

The aeration system comprises a fan arranged in the equipment room and ventilation pipes respectively arranged in the primary aerobic zone, the secondary aerobic zone and the membrane zone, and the fan ventilates the primary aerobic zone, the secondary aerobic zone and the membrane zone through the ventilation pipes.

Specifically, the anaerobic zone, the primary anoxic zone and the primary aerobic zone are arranged above the secondary anoxic zone, the secondary aerobic zone, the membrane treatment unit and the equipment room in a splicing mode.

The membrane module consists of a membrane frame and a membrane.

Compared with the prior art, the beneficial effect of above-mentioned equipment is:

(1) the process system is combined with integrated sewage treatment equipment, and the quality of effluent water is stable and reaches standard IV water;

(2) the integrated sewage equipment fully utilizes the A/O unit, enhances nitrogen and phosphorus removal and has good water outlet effect;

(3) the aerobic zone adopts 18-20 holes phi 25 filler, a support is not needed, and the filler is directly added into the primary aerobic zone and the secondary aerobic zone, wherein the feeding ratio is 15-50%. Increase the microbial biomass of the system and improve the treatment effect. The emptying pipe is provided with meshes for water passing through each partition plate, so that the filler is prevented from losing.

(4) The integrated sewage equipment is adopted to replace the conventional civil engineering structure, and the overlapping installation form is adopted, so that the occupied area is saved by more than 40%;

(5) the equipment material is not affected by chloride ions;

(6) the construction period is short.

In addition, the invention also provides a method for treating sewage by using the splicing sewage treatment equipment for reaching the quasi-IV water in the coastal region, which comprises the following steps:

sewage to be treated sequentially passes through the grid well, the water collecting tank, the coagulating sedimentation tank, the integrated sewage treatment equipment, the ozone contact tank and the sodium hypochlorite disinfection tank, wherein in the integrated sewage treatment equipment, the sewage sequentially passes through the anaerobic zone, the primary anoxic zone, the primary aerobic zone, the secondary anoxic zone, the secondary aerobic zone and the membrane zone.

Compared with the prior art, the process has the beneficial effects that:

(1) the quality of the effluent water is stable and reaches the standard IV water, the installation and construction period is short, and the operation and maintenance are simple and convenient;

(2) a novel overlapping installation mode is adopted, the integrated sewage equipment is highly integrated, and the problem of limited occupied area of a sewage plant is solved;

(3) the problem that the material of SUS304 stainless steel equipment is easy to corrode due to the fact that the content of chloride ions in air in coastal areas is high is solved.

Drawings

FIG. 1 is a general process flow diagram of a splicing sewage treatment plant for reaching quasi IV-class water in coastal areas provided by the invention;

FIG. 2 is a schematic structural diagram of an integrated sewage treatment plant of the splicing sewage treatment plant for reaching quasi IV-class water in coastal areas provided by the invention;

FIG. 3 is a front view of an integrated sewage treatment plant of the splicing sewage treatment plant for reaching quasi IV-class water in coastal areas provided by the invention;

FIG. 4 is a front view of an integrated sewage treatment apparatus of the splicing sewage treatment apparatus for reaching quasi-IV class water in coastal areas provided by the present invention;

FIG. 5 is a side view of an integrated sewage treatment apparatus of the present invention for a coastal zone quasi-IV type water stacking assembly sewage treatment apparatus;

FIG. 6 is a top view of the integrated sewage treatment plant of the splicing sewage treatment plant for reaching quasi IV-class water in the coastal region provided by the invention.

In the figure: 1-anaerobic zone, 2-first-stage anoxic zone, 3-first-stage aerobic zone, 4-second-stage anoxic zone, 5-second-stage aerobic zone, 6-membrane zone, 7-equipment room and 8-clear water tank.

Detailed Description

For a better understanding of the present invention, the following further illustrates the present invention with reference to the accompanying drawings and specific examples, but the present invention is not limited to the following examples.

The invention is realized by the following technical scheme that the method for treating the sewage reaching the IV-class water in the coastal region comprises a grid well, a water collecting tank, a coagulating sedimentation tank, a set of integrated sewage treatment equipment, an ozone contact tank, an ozone generating device and a sodium hypochlorite disinfection tank.

The process flow is shown in figure 1.

The sewage firstly enters a grid grit chamber, large-particle suspended impurities are intercepted, mud and water separation is carried out simultaneously, then a part of coarse suspended matters and heavy sand particles are separated by the grid chamber, and then the sewage enters a water collecting tank. The pool has a certain sewage storage amount, and plays a role in balancing and adjusting water quality and water quantity, so that impact on subsequent units is avoided when the water quality and water quantity are greatly fluctuated.

And a lifting pump (submersible sewage pump) is arranged in the water collecting tank, and then signals are transmitted by a liquid level control instrument and are sent to the coagulating sedimentation tank by the lifting pump, so that the front end of the inlet of phosphorus and suspended matters is pretreated.

After being treated by coagulating sedimentation, the sewage is lifted to the 1 st treatment unit of the integrated sewage treatment equipment and flows through the 2 nd treatment unit, the 3 rd treatment unit, the 4 th treatment unit and the 5 th treatment unit in sequence. And biological fillers are added into the treatment units 3 and 5 in a proportion of 20-50%, and the organic pollutants are removed and simultaneously the synchronous nitrification and denitrification are realized through the biochemical reactions of various microorganisms such as anaerobic microorganisms, anoxic microorganisms and aerobic microorganisms on the biological fillers, so that the nitrogen and phosphorus removal purpose is achieved. After the wastewater passes through the first 5 sections of treatment units, the treated effluent enters an MBR membrane treatment unit for solid-liquid separation, and pollution indexes such as COD (chemical oxygen demand), SS (suspended solid) and the like are further removed.

The effluent from the MBR membrane treatment unit enters an ozone contact tank, ozone and pollutants generated by an ozone generating device react in the ozone contact tank to oxidize and decompose refractory organic matters in sewage, and the residual macromolecules, long chains and refractory organic matters in the wastewater can be directly mineralized into carbon dioxide and water, and the carbon dioxide and the water are partially decomposed into micromolecular easily biodegradable substances to destroy the structure of the refractory organic matters and reduce toxicity.

The water is discharged after the ozone contacts the pool and is treated by an ultraviolet disinfection channel to reach the standard and be discharged.

The bottom of the grating grit chamber and the bottom of the integrated sewage equipment are both provided with sludge pumps for regularly discharging sludge to a sludge tank for storage, and the sludge at the bottom of the sludge tank is concentrated after anaerobic digestion and is regularly sucked and transported outside after being disinfected.

Specifically, the integrated sewage equipment consists of a main body equipment and an equipment room. The main body equipment comprises 5 biochemical treatment unit sections and 1 membrane treatment unit, and 7 functional partitions are arranged among 1 piece of equipment. Power equipment such as an electric control system, a fan, a pump, a clear water tank, a dosing system and the like are highly integrated in the equipment room. Specifically, an anaerobic zone, a primary anoxic zone, a primary aerobic zone, a secondary anoxic zone, a secondary aerobic zone, a membrane zone and a device room.

The structure of the integrated equipment is shown in the attached figures 2-6.

Wherein, anaerobic zone sets up the inlet tube in equipment wall upper end, and the water distribution mode of intaking: adopting DN 40-DN 80UPVC water inlet pipe, the water inlet pipe is introduced into the bottom of the anaerobic zone, the bottom is divided into 2 branches which are I-shaped, the diameter of the opening of each branch is

The uniform water distribution and the hydraulic stirring effect are achieved (different from the conventional perforation water distribution mode, the problem that perforation water distribution is easy to block is solved). Meanwhile, the anaerobic zone is provided with an overflow pipeline to ensure the safe water level in the equipment; the arrangement of the emptying pipe is convenientEquipment maintenance and overhaul; the crawling ladder and the access hole are arranged, so that the overhaul by personnel is facilitated; and a return pipe is arranged, and the sludge in the second-stage anoxic zone is returned to the anaerobic zone through a return pump. The anaerobic zone and the first-stage anoxic zone are provided with a partition plate, and the top of the partition plate is open, so that sewage in the anaerobic zone can overflow to the first-stage anoxic zone through the top of the partition plate conveniently.

The submerged stirrer is arranged at the opposite angle of the first-level anoxic zone equipment to play a role in stirring. The primary anoxic zone and the primary aerobic zone are directly provided with a partition plate, and a hole is formed in the partition plate at a position 200-300mm away from the bottom of the partition plate, so that water flow can conveniently flow into the primary aerobic zone from the bottom; a return pipe is arranged, and the sludge in the first-stage aerobic zone is returned to the first-stage anoxic zone through a return pump.

The wall of the primary aerobic zone is provided with an aeration pipeline which is led into the bottom of the equipment and is uniformly provided with aeration discs for oxygenation and stirring. A return pipe is arranged, and the sludge in the membrane area is returned to the first-level aerobic area through a return pump. And arranging a vent pipe and a communicating pipe with the lower-layer equipment, so that water flow flows into the lower-layer equipment through the communicating pipe.

The secondary anoxic zone structure is provided with the same-stage anoxic zone;

the secondary aerobic zone is the same as the primary aerobic zone.

After passing through the 5-stage biochemical treatment unit, the effluent enters an MBR membrane treatment unit for solid-liquid separation, and pollution indexes such as COD (chemical oxygen demand), SS (suspended solid) and the like are further removed. And then a water producing pump in the equipment room provides power to produce water to a clear water tank to be discharged out of the integrated sewage equipment, and subsequent ozone contact and ultraviolet disinfection are carried out.

The membrane area is provided with a membrane component which consists of a membrane frame, a membrane and an aeration system. The effluent of the membrane area passes through a water production pipeline and is collected to a clean water tank at the top of the equipment room. The membrane area water production pipeline is provided with an exhaust pipe, so that air in the membrane can be evacuated conveniently during maintenance. The final effluent of the equipment is discharged through a water outlet pipe of the clean water tank, and a branch is arranged to discharge a part of the effluent to the clean water tank, so that the clean water can be conveniently used for backwashing the membrane.

The device compartments are separated from the membrane region by spacers. The equipment room is provided with devices such as an electric control cabinet, a fan, a water producing pump, a back washing pump, a medicine adding barrel and the like, and the device is reasonable in layout and convenient for personnel to operate.

Meanwhile, preferably, in order to make the biochemistry fully play a role and strengthen nitrogen and phosphorus removal, the whole biochemical treatment unit also comprises a reflux system, an aeration system and a dosing system.

The reflux system comprises three sections, namely reflux R1, a reflux ratio of 100-200% (from the tail end of the secondary anoxic zone to the front end of the anaerobic zone for front end sludge supplement), reflux R2, a reflux ratio of 100-300% (from the tail end of the primary aerobic zone to the front end of the primary anoxic zone for nitrifying liquid reflux), reflux R3, and a reflux ratio of 100-400% (for preventing the high dissolved oxygen of the MBR membrane processing unit from influencing the anoxic tank, the MBR membrane processing unit reflows to the front end of the primary aerobic zone, and the sludge of the primary aerobic tank enters the secondary anoxic tank for denitrification).

The aeration system mainly provides dissolved oxygen required by the growth of microorganisms for the primary aerobic zone, the secondary aerobic zone and the membrane zone through a fan between the devices.

The dosing system comprises a carbon source dosing system, an alkalinity dosing system and a phosphorus removal dosing system, and the carbon source and alkalinity dosing system doses carbon sources and alkalinity to a primary anoxic area and a secondary anoxic area, so that the denitrification effect is improved; and a phosphorus removal agent (ferric salt, aluminum salt and the like) is added to the tail end of the secondary aerobic zone or an MBR membrane treatment unit by the phosphorus removal agent adding system so as to remove phosphorus pollutants in the sewage.

Preferably, in order to save occupied land, the integrated sewage equipment is divided into two parts, wherein the front section is an anaerobic zone, a first-stage anoxic zone and a first-stage aerobic zone, and the rear section is a second-stage anoxic zone, a second-stage aerobic zone, a membrane treatment unit and an equipment room. The anterior segment is installed on back end equipment with the mode of folding the piece together, and the support adopts the steel construction platform, sets up cat ladder and railing. And in order to conveniently overhaul the diaphragm, a diaphragm overhaul port is reserved, and the diaphragm overhaul port is shown in an attached drawing 2.

Preferably, in order to solve the problem of influence of chloride ions in air in coastal areas, 316 stainless steel or 304 is adopted as an additional anticorrosive paint.

Preferably, for shortening the construction and installation period, the integrated equipment is welded by adopting stainless steel concave-convex plates, the specification and the size of the stainless steel concave-convex plates are mainly 1m by 1m and 0.5m by 1m, the materials are small and exquisite, the transportation is convenient and fast, and the implementation period is short.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A splicing sewage treatment device for reaching IV-class water in coastal areas is characterized in that,

including grid well, catch basin, coagulating sedimentation tank, integration sewage treatment device, ozone contact pond and the sodium hypochlorite disinfection pond that communicates in order, wherein integration sewage treatment device is including anaerobic zone (1), one-level anoxic zone (2), one-level aerobic zone (3), second grade anoxic zone (4), second grade aerobic zone (5) and membrane district (6) that communicate in order, integration sewage treatment device still includes equipment room (7) still are equipped with clear water tank (8), the delivery port of membrane district (6) with clear water tank (8) intercommunication.

2. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: the anaerobic zone (1) lower part is equipped with the inlet tube, and upper portion is equipped with the intercommunication the delivery port of one-level anoxic zone (2), the inlet tube is laid to the I shape, and evenly distributed has the inlet opening, the inlet tube in anaerobic zone (1) with coagulating sedimentation tank intercommunication, anaerobic zone (1) lateral wall top is equipped with the overflow pipe, and the bottom is equipped with the blow-down pipe, has still arranged along its lateral wall inboard and has overhauld the cat ladder.

3. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: the submerged stirrers are arranged at the diagonal positions of the bottoms of the primary anoxic zone (2) and the secondary anoxic zone (4), a first water outlet hole is formed in the position, 200 mm away from the bottom wall, of the side wall of the primary anoxic zone (2), the first water outlet hole is communicated with the primary aerobic zone (3), a second water outlet hole is formed in the position, 200 mm away from the bottom wall, of the side wall of the secondary anoxic zone (4), and the second water outlet hole is communicated with the secondary aerobic zone (5).

4. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: the second-stage anoxic zone (4) is provided with a first reflux pump, a sludge inlet of the first reflux pump is communicated with the second-stage anoxic zone (4), and a sludge outlet of the first reflux pump is communicated with the anaerobic zone (1).

5. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: the utility model discloses a sewage treatment device, including one-level aerobic zone (3) and second grade aerobic zone (5), one-level aerobic zone (3) and second grade aerobic zone (5) all are equipped with aeration pipe and blow-down pipe in the bottom, the delivery port of one-level aerobic zone (3) with second grade anoxic zone (4) intercommunication, the delivery port of second grade aerobic zone (5) with membrane district (6) intercommunication, one-level aerobic zone (3) still are equipped with the second backwash pump, the mud import of second backwash pump with one-level aerobic zone (3) intercommunication, sludge outlet with one-level anoxic zone (2) intercommunication.

6. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: the membrane area (6) is provided with a membrane component, the membrane area (6) is also provided with a third reflux pump, and the third reflux pump is used for conveying sludge to the first aerobic area (3).

7. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: a back washing pump is arranged in the clean water tank (8), a water inlet of the back washing pump is communicated with the clean water tank (8), and a water outlet of the back washing pump is aligned with the membrane component of the membrane area (6).

8. The splicing sewage treatment equipment for reaching quasi-IV-class water in the coastal region according to claim 1, is characterized in that: still include aeration systems, aeration systems is including setting up fan between equipment and setting up respectively the ventilation pipe in one-level aerobic zone (3), second grade aerobic zone (5) and membrane area (6), the fan passes through the ventilation pipe to one-level aerobic zone (3), second grade aerobic zone (5) and membrane area (6) ventilate.

9. The stackable sewage treatment plant according to any one of claims 1 to 8, wherein: the anaerobic zone (1), the primary anoxic zone (2) and the primary aerobic zone (3) are arranged above the secondary anoxic zone (4), the secondary aerobic zone (5), the membrane zone (6) and the equipment room (7) in a splicing mode.

10. A method for treating sewage of coastal region reaching IV-class water by overlapping and splicing is characterized by comprising the following steps: the offshore area quasi-IV water cascading sewage treatment equipment comprises the following steps of:

sewage to be treated sequentially passes through the grid well, the water collecting tank, the coagulating sedimentation tank, the integrated sewage treatment equipment, the ozone contact tank and the sodium hypochlorite disinfection tank, wherein in the integrated sewage treatment equipment, the sewage sequentially passes through the anaerobic zone (1), the primary anoxic zone (2), the primary aerobic zone (3), the secondary anoxic zone (4), the secondary aerobic zone (5) and the membrane zone (6).