CN212315868U - Integrated device for biological treatment of organic sewage containing COD and nitrogen by A/O tower - Google Patents
Integrated device for biological treatment of organic sewage containing COD and nitrogen by A/O tower Download PDFInfo
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- CN212315868U CN212315868U CN202021730892.8U CN202021730892U CN212315868U CN 212315868 U CN212315868 U CN 212315868U CN 202021730892 U CN202021730892 U CN 202021730892U CN 212315868 U CN212315868 U CN 212315868U
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Abstract
The application provides an integrated device for biologically treating organic sewage containing COD and nitrogen by an A/O tower, which comprises a cylinder body; a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom; the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone; a sewage inlet arranged in the anoxic zone; the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone. The device integrates water distribution, filtration, aerobic and anoxic functions, and saves the floor area. The device has higher pollutant removal load per unit volume. The aerobic zone can cooperatively treat odor generated by the anoxic zone; the removal rate of COD, ammonia nitrogen and total nitrogen batteries is higher.
Description
Technical Field
The application belongs to the technical field of biological sewage treatment, and particularly relates to an integrated device for biological treatment of organic sewage containing COD and nitrogen by an A/O tower.
Background
At present, the sewage biological treatment process and the device widely adopted at home and abroad all adopt the method of culturing biological strains in sewage, including anaerobic, anoxic and aerobic, the activated sludge method for the strains in a planktonic state, the contact oxidation method for the strains attached to the surfaces of various fillers, the biological rotating disc method and the like. The process and the device have the advantages, are widely applied to the fields of urban sewage treatment, rural domestic sewage treatment and industrial organic sewage treatment at present, but have the following characteristics: (1) liquid-solid two-phase contact oxygen supply, which is a liquid-solid two-phase contact oxygen supply system, wherein aerobic activated sludge or a contact oxidation process with the largest capacity and the most important function is used, water needs to be accumulated in the tank, and a high-pressure fan is used for continuously inflating an aeration head and an aeration pipe at the bottom of the tank so that sewage has enough dissolved oxygen to ensure that organisms and microorganisms in the sewage treatment tank obtain oxygen required by respiration; (2) the facultative tank, the aerobic tank and the sedimentation tank are all separately and independently arranged and are arranged in a plane type ladder way.
However, the prior art also has the following disadvantages: (1) the microorganisms can only absorb dissolved oxygen in sewage, and because the solubility of oxygen in water is only 6.84ml/l, the oxygen demand of high-density biological flora can not be provided, and the dominant aerobic biological strains with high oxygen consumption, high activity and high degradation performance can not be cultured; (2) the wall and the bottom of the sewage treatment tank need to bear high pressure and need to prevent leakage; the high-pressure fan needs to be independently installed, and the building cost of a fan room to be built is high; (3) the high-pressure fan continuously supplies air to the aeration head or the aeration pipe combination at the bottom of the sewage tank, and the high-pressure fan, the aeration head or the aeration pipe combination equipment has high manufacturing cost; (4) the high-pressure fan has high energy consumption; (5) in order to optimize the construction cost and the air supply cost of the aerobic biochemical tank, the tank depth is usually controlled to be 3-5 m, and the aerobic tank can only be independently arranged in a plane due to large operation weight, so that the occupied area of the aerobic tank is large; (6) the anoxic tank produces odor, hydrogen sulfide and ammonia gas to pollute the environment, a waste gas treatment facility needs to be built by covering and collecting the anoxic tank, and the high-pressure fan produces large noise to pollute the environment.
Therefore, the prior art has the defects of large occupied area, high investment, high fan energy consumption, high operation cost, serious odor of waste gas of an anoxic tank, high noise of a high-pressure fan, no site and few sites, and the defects that the treatment facility with standard requirements of pollutant emission water quality can not meet the requirements of the site improvement and reconstruction project cannot be implemented in newly-built sewage treatment plants.
Content of application
In view of this, the present application aims to provide an integrated device for biological treatment of organic sewage containing COD and nitrogen by an a/O tower, which integrates oxygen deficiency, water distribution, filtration, aerobic treatment and sedimentation, and has a high pollutant removal efficiency.
The application provides an integrated device for biologically treating organic sewage containing COD and nitrogen by an A/O tower, which comprises a cylinder body;
a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom;
the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone;
a sewage inlet arranged in the anoxic zone;
the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone.
The three-phase contact aerobic zone comprises a rotational flow gas supply zone and an aerobic zone arranged right above the rotational flow gas supply zone;
the cylinder wall of the rotational flow air supply area is provided with a low-pressure fan, and low-pressure air is supplied to the rotational flow air supply area through an air inlet;
the rotational flow gas supply area is communicated with the nitrifying liquid backflow discharge area.
Preferably, the apparatus further comprises a precipitation clean water discharge unit; the sedimentation clear water discharge unit is provided with a sludge discharge port and a sludge discharge pipe connected with the discharge port;
the sludge discharge pipe is provided with a redundant sludge discharge port and a return sludge control valve; the return sludge control valve conveys return sludge and sewage treated by the anoxic zone to the water distribution zone;
the sedimentation clear water discharge unit is arranged in the barrel and is positioned between the nitrification liquid reflux discharge area and the anoxic area; or is arranged outside the cylinder body;
and discharging part of the nitrified liquid in the nitrified liquid reflux discharge area into a precipitation clear water discharge unit.
Preferably, if the sedimentation clean water discharge unit is arranged outside the barrel body;
the nitrified liquid backflow discharge area in the cylinder body comprises a nitrified liquid collecting tank;
a nitrified liquid discharge port and an exhaust hole which are arranged at the bottom of the nitrified liquid collecting tank; the nitrifying liquid discharge port is connected with a nitrifying liquid guide pipe; the exhaust hole exhausts the gas generated in the anoxic zone to the rotational flow gas supply zone;
the lower part of the nitrifying liquid diversion well is provided with a nitrifying liquid reflux port and a nitrifying liquid discharge port;
the nitrifying liquid reflux port is communicated with the anoxic zone; the nitrified liquid discharge port is connected to a water inlet of the sedimentation clear water discharge unit positioned outside the barrel body through a pipeline.
Preferably, if the sedimentation clear water discharge unit is arranged in the barrel, the nitrified liquid reflux discharge area in the barrel comprises a nitrified liquid collecting tank;
an exhaust-nitrification liquid diversion pipe 17-1 and a central diversion cylinder 19-1 which are arranged at the bottom of the nitrification liquid collecting tank;
the exhaust-nitrification liquid guide pipe discharges gas in the anoxic zone to the rotational flow gas supply zone and partial nitrification liquid enters the precipitation clear water discharge unit through the central guide cylinder;
and the other part of nitrified liquid in the nitrified liquid backflow discharge area flows back to the anoxic area through an exhaust-nitrified liquid diversion pipe 17-1 passing through the precipitated clear water discharge unit.
Preferably, the filtering area is a filtering material particle filtering layer made of quartz sand, common sand or granular activated carbon with the particle size of 3-50 mm and the thickness of 50-300 mm; or a mesh-shaped filter plate or a porous filter plate.
Preferably, if the sedimentation clean water discharge unit is arranged in the barrel, an annular overflow groove is formed in the inner wall of the barrel of the sedimentation clean water discharge unit;
and a clear water discharge port is formed in the outer wall of the barrel corresponding to the annular overflow groove.
The application provides an integrated device for biologically treating organic sewage containing COD and nitrogen by an A/O tower, which comprises a cylinder body; a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom; the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone; a sewage inlet arranged in the anoxic zone; the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone. The device integrates water distribution, filtration, three-phase contact aerobic, nitrified liquid reflux discharge and oxygen deficiency, and saves the occupied area. The device has higher pollutant removal load per unit volume. The aerobic zone can cooperatively treat odor generated by the anoxic zone; the removal rate of COD, ammonia nitrogen and total nitrogen batteries is higher.
Drawings
FIG. 1 is a schematic view of an apparatus for efficiently treating sewage in urban and rural areas by using an A/O tower according to the present invention; wherein, 1 is an anoxic zone, 2 is an aerobic zone, 3 is a rotational flow gas supply zone, 4-1 is a sedimentation zone, 5 is a water inlet, 6 is a carbon source adding port, 7 is a submersible stirrer, 8 is a sampling detection port, 9 is an anoxic flow control valve, 10 is a lift pump, 11 is a lift main valve, 12 is a water distribution pipe, 13 is a filtering system, 14 is a filler bracket, 15 is a filler, 16 is a low-pressure fan, 17-1 is an exhaust-nitration liquid guide pipe, 18 is a nitration liquid collecting tank, 19-1 is a central guide cylinder, 20-1 is a conical water baffle, 21-1 is an annular overflow tank, 22-1 is a clear water discharge port, 23-1 is conical sediment shaking mud, 24 is a redundant sludge discharge port, 25 is a return sludge control valve, and 26 is a cylinder body;
FIG. 2 is a schematic view of another apparatus for efficiently treating urban and rural sewage by using the A/O tower provided by the present application; wherein 4-2 is a nitrifying liquid diversion well, 17-2 is a nitrifying liquid diversion pipe, 19-2 is an exhaust hole, 20-2 is a nitrifying liquid backflow control valve, 21-2 is a nitrifying liquid lifting pump, 22-2 is a water inlet to a sedimentation tank, 23-2 is a sludge outlet from the sedimentation tank, 27 is a nitrifying liquid backflow port, and the names of other labels are the same as the corresponding labels in fig. 1.
Detailed Description
The application provides an integrated device for biologically treating organic sewage containing COD and nitrogen by an A/O tower, which comprises a cylinder body;
a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom;
the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone;
a sewage inlet arranged in the anoxic zone;
the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone.
The device integrates water distribution, filtration, three-phase contact aerobic, nitrified liquid reflux discharge and oxygen deficiency, and saves the occupied area. The device has higher pollutant removal load per unit volume. The aerobic zone can cooperatively treat odor generated by the anoxic zone; the removal rate of COD, ammonia nitrogen and total nitrogen batteries is higher.
See fig. 1 and 2; FIG. 1 is a schematic view of an apparatus for efficiently treating organic sewage in cities, towns, rural areas, industries and the like by using an A/O tower provided by the present application; FIG. 2 is a schematic view of another apparatus for efficiently treating organic sewage in cities, towns, rural areas, industries and the like by using the A/O tower provided by the application.
In the present application, the anoxic zone is disposed at a lower portion of the integrated device; in the anoxic zone:
a. hydrolyzing refractory organic matters into micromolecular easily degradable organic matters under the anoxic condition;
b. converting organic nitrogen in the sewage into ammonia nitrogen, wherein the reaction formula is as follows:
ammoniation of organic nitrogen in an anoxic state:
(CH3)4NOH+O2→(CH3)3N+HCHO
(CH3)3N+O2→(CH3)2NH+HCHO
(CH3)2NH+O2→CH3NH2+HCHO
CH3NH2+O2→NH3+HCHO
c. and (2) converting nitrate nitrogen which flows back to the anoxic zone from the three-phase contact aerobic zone into nitrogen under the action of denitrifying bacteria under the anoxic condition, wherein the reaction formula is as follows:
d. the effluent of the anoxic zone and the sludge in the sludge precipitation backflow clear water discharge zone are combined and pumped to the water distribution zone;
e. gases such as odor, nitrogen and the like generated in the anoxic zone are exhausted to a gas supply zone of the three-phase contact aerobic zone through an exhaust pipe penetrating through the precipitation zone;
f. the carbon source required to be added in the anoxic zone is added through a carbon source feeding port 6.
The anoxic zone 1 comprises an anoxic tank, wherein a stirring device for preventing sludge from settling, namely a submersible stirrer 7, is arranged at the bottom in the anoxic tank, and the submersible stirrer can be an underwater stirring pump, a submersible stirrer or a hydraulic stirrer;
and a sewage inlet 5 is arranged on the anoxic zone. A carbon source feeding port 6 is arranged on the anoxic tank;
the anoxic zone can be provided with a COD, dissolved oxygen, nitrate nitrogen and ammonia nitrogen automatic monitoring device at the bottom according to requirements. A sampling detection port is arranged on the anoxic tank; the detection port is used for a monitoring port or an on-line monitor for measuring ammoniacal nitrogen, nitrate nitrogen, COD and DO.
The anoxic zone is communicated with the water distribution zone through a pipeline, and a lifting device for lifting sewage is arranged on the pipeline. The lifting device comprises a lift pump 10 and a lift main valve 11.
In the application, the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone; the lift pump 10 lifts the sewage treated in the anoxic zone to the water distribution zone through a pipeline. A sampling detection port 8 and an anoxic flow control valve 9 are arranged on a pipeline between a water outlet of the anoxic zone and the lift pump.
In the application, the water distribution area is positioned at the top of the A/O tower; the water distribution area comprises a water distribution device; the water distribution device enables sewage to uniformly drip to the filtering area on the water inlet plane. The water distribution device can be a sawtooth-shaped water distribution tank, a perforated water distribution pipe, a water spray faucet or a rotary perforated pipe water distributor. The perforation diameter of the perforated water distribution pipe 12 is 5-30 mm, and the perforation interval is 100-300 mm; the vertical height of the water outlet of the water distribution device from the filtering area is preferably 200-800 mm.
After passing through the water distribution zone, the sewage flows to the filtering zone. The filtering area is arranged between the water distribution area and the three-phase contact aerobic area; the filtering area can filter blocks, particles and floating objects in sewage, and the system is prevented from being blocked. The filtering area comprises a filtering system 13, and the filtering system is selected from a quartz sand, common sand or granular activated carbon filtering material particle filtering layer with the particle size of 3-50 mm and the thickness of 50-300 mm; or a mesh-shaped filter plate or a porous filter plate.
The three-phase contact aerobic zone is arranged between the filtering zone and the nitrified liquid backflow discharging zone; the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone; the oxygen concentration of the three-phase contact aerobic zone is 23-26%; the pressure is 50Pa to 1000 Pa. The dissolved oxygen concentration of the water-accumulating type aerobic zone in the prior art is 6-7 mg/l, and the pressure is 40000-70000 Pa.
The three-phase contact aerobic zone comprises a rotational flow air supply zone 3 and an aerobic zone 2 arranged right above the rotational flow air supply zone; and a low-pressure fan 16 is arranged on the cylinder wall of the rotational flow air supply area and provides low-pressure air for the rotational flow air supply area through an air inlet. The rotational flow gas supply area is communicated with the nitrifying liquid backflow discharge area. The three-phase contact aerobic zone has the following functions:
a. the organic matters in the sewage are absorbed and degraded, the organic matters are absorbed as nutrients by the film-shaped aerobic organisms attached to the biological filler, the film-shaped aerobic organisms can generate activity only by continuously providing oxygen required by the respiration process for the film-shaped aerobic organisms, the activity of the aerobic organisms can be greatly improved in an oxygen-enriched state, and the absorption and degradation rate of organic pollutants is improved. The biomembrane attached to the surface of the filler is exposed in the air when the device is operated, the sewage containing biological strains is contacted with the biomembrane from top to bottom, the mud-shaped strains in the sewage water drops and the biomembrane strains attached to the filler obtain the oxygen required by respiration by absorbing the oxygen in the air and the dissolved oxygen in the water layer on the surface of the biomembrane, the process is a mass transfer process in which the air, the liquid and the solid are contacted with each other, the biomembrane obtains the oxygen required by respiration, the oxygen content in the air is about 25 percent, the solubility of the oxygen in the water is only 6.84ml/l, the oxygen content in the former is greatly improved compared with the latter, the oxygen-enriched state generated by directly contacting the air and the thin layer water on the surface of the biomembrane with the organisms and the microorganisms in the biomembrane can greatly improve the number and the activity of the organisms and the microorganisms in the unit volume of the treatment device, and can cultivate, The dominant bacteria with strong biological activity and strong pollutant degradation capability, thereby improving the pollutant removal load of the treatment device per unit volume, and air is input from bottom to top by a low-pressure fan or a fan positioned at the bottom of the tower or can be naturally input by the pores of the permeable cylinder;
b. nitrification, wherein ammonia nitrogen is nitrified into nitrate nitrogen under the action of aerobic biological bacteria, and the reaction formula is as follows:
NH4 ++O2+HCO3-→NO2 -+C5H7O2N+H2O+H2CO3
NO2 -+NH4 ++H2CO3+HCO3 -+O2→C5H7O2N+NO3 -；
c. nitrifying liquid flows back and is discharged into a sedimentation tank for flow splitting, part of nitrifying liquid flowing out of a nitrifying liquid collecting tank at the bottom of a rotational flow gas supply area of the area flows into the anoxic area positioned at the bottom of the tower in a self-flow mode, part of nitrifying liquid flows into a subsequent sedimentation clear water discharge unit in a self-flow or pump lifting mode, the reflux ratio is adjusted and controlled by adjusting a nitrifying liquid reflux control valve, and the ratio of the amount of the reflux water to the amount of water entering the sedimentation area is 1-3;
d. the deodorization function is that the malodorous gas and nitrogen generated from the anoxic zone at the bottom pass through the exhaust pipe of the settling zone, enter the air supply zone of the three-phase contact aerobic zone, are mixed with air and then flow upwards to the aerobic three-phase contact zone for biological deodorization, and no malodorous gas is discharged from the tower top, so that the most environment-friendly deodorization technology is preferentially selected;
e. the rotational flow air supply area is provided with a low-pressure fan 16; the low-pressure fan supplies air, and the air pressure of the fan is 50-1000 Pa, so that the process is low in energy consumption. The compressed air is continuously input into the air supply area of the three-phase contact aerobic (O) process by 1 or more low-pressure fans arranged on the peripheral wall of the device, the air supply area forms a rotational flow, and the compressed air in the air supply area is discharged at the upper part after flowing upwards through cavities among biological films and water drops in the biological contact oxidation area. The technical indexes are as follows: the wind pressure is 50-1000 Pa, and the rising speed of compressed air is 5-100 mm/s; the control method comprises the following steps: controlling the number of fans or the air speed of the fans to adjust the air supply quantity according to the measured dissolved oxygen index of the nitrifying liquid. The oxygen required by the respiration of aerobic biological strains in the device is obtained by continuously conveying air, low-pressure air is mixed with odor and nitrogen from an anoxic procedure to form rotational flow in an air supply chamber, the rotational flow flows through an air cavity between biological membranes by utilizing the pressure difference between the air supply chamber and the contact area of the aerobic biological strains, and redundant oxygen-containing air and gas tail gas are discharged from the top of the tower. The oxygen supply system does not need to be provided with an aeration head and an aeration pipe.
The upper part in the three-phase contact aerobic zone is provided with a filler bracket 14 which is arranged in parallel up and down; the support is made by materials such as firm metal, plastics, nylon that are difficult for ageing, and the interval between two adjacent supports is 100 ~ 200 mm. The support is vertically arranged between the two supports, two ends of the support are fixed, the filler 15 with a high specific surface area and used for attaching a biological membrane is arranged between the two supports, and the installation distance between every two adjacent fillers is 50-200 mm. The packing layer can be prefabricated into modules for assembly on site; the three-phase contact aerobic zone can be arranged in a single layer or multiple layers; the height of the packing layer is 3000-15000 mm. The filler is installed in a support binding mode or a layered stacking mode, the support binding mode is that the filler is fixed on a strip made of materials with good firmness and low elasticity, such as plastics, nylon or metal, and the upper end and the lower end of a plurality of strips bound with the filler are respectively fixed on an adding support to form a filler layer; the layered stacking type is to stack the block-shaped filler directly on the net-shaped bracket with the aperture smaller than the filler particle diameter at the bottom, and the layered stacking type can be formed by combining a plurality of filler layers.
The tower body peripheral wall structure of the three-phase contact aerobic zone is as follows: the area runs in a non-water accumulation state in the cylinder body, no side pressure resistance and seepage prevention requirements exist, and the peripheral wall is assembled by using corrosion-resistant ordinary or heat-insulating plates made of metal and plastic materials in a welding mode, a concave-convex groove embedding bolt fixing mode and the like.
And one or more low-pressure fans are arranged on the cylinder wall of the rotational flow air supply area, the air pressure of the low-pressure fans is 50-1000 Pa, and the air quantity is determined according to the processing capacity. A nitrified liquid collecting tank 18 is arranged at the bottom of the rotational flow gas supply area; the nitrified liquid collecting tanks are arranged in a plane mode; the depth of the nitrified liquid collecting tank is 100-500 mm.
The device also comprises a precipitation clear water discharge unit; the sedimentation clear water discharge unit is provided with a sludge discharge port and a sludge discharge pipe connected with the discharge port; the sludge discharge pipe is provided with a redundant sludge discharge port and a return sludge control valve; the return sludge control valve conveys return sludge and sewage treated by the anoxic zone to the water distribution zone; the sedimentation clear water discharge unit is arranged in the barrel and is positioned between the nitrification liquid reflux discharge area and the anoxic area; or is arranged outside the cylinder body; and discharging part of the nitrified liquid in the nitrified liquid reflux discharge area into a precipitation clear water discharge unit. The sedimentation clear water discharge unit is used for carrying out mud-water separation on the mud-water mixture from the nitrified liquid collecting tank by adopting a sedimentation method, and discharging the obtained clear water; and dewatering and drying the obtained precipitated sludge by partial sludge drying equipment, and refluxing and merging partial sludge to a water outlet pipe of the anoxic zone. This application is through mud reflux valve 25 control mud reflux ratio, and mud reflux volume/clear water emission is 0.3 ~ 0.8: 1. the excess sludge is discharged through the excess sludge discharge port 24.
In the present application, if the sedimentation clean water discharge unit is disposed outside the barrel;
the nitrified liquid backflow discharge area in the cylinder body comprises a nitrified liquid collecting tank;
a nitrified liquid discharge port and an exhaust hole 19-2 are arranged at the bottom of the nitrified liquid collecting tank; the nitrifying liquid discharge port is connected with a nitrifying liquid guide pipe 17-2; the exhaust hole 19-2 exhausts the gas generated in the anoxic zone to the rotational flow gas supply zone; and a nitrifying liquid diversion well 4-2 communicated with the nitrifying liquid diversion pipe, wherein the lower part of the nitrifying liquid diversion well is provided with a nitrifying liquid return port 27 and a nitrifying liquid discharge port;
the nitrifying liquid reflux port is communicated with the anoxic zone; the nitrified liquid discharge port is connected to the water inlet of the sedimentation clear water discharge unit through a pipeline.
A nitrifying liquid reflux control valve 20 is arranged on a pipeline between the nitrifying liquid outlet and the sedimentation tank water inlet 22. The nitrified liquid is discharged to the sedimentation tank through a nitrified liquid lift pump 21.
In the present application, if the sedimentation clear water discharge unit is disposed in the barrel, the nitrified liquid reflux discharge area in the barrel comprises a nitrified liquid collecting tank 18;
an exhaust-nitrification liquid diversion pipe 17-1 and a central diversion cylinder 19-1 which are arranged at the bottom of the nitrification liquid collecting tank;
the exhaust-nitrification liquid draft tube 17-1 discharges the gas in the anoxic zone to the rotational flow gas supply zone and part of nitrification liquid enters the precipitated clear water discharge unit through the central draft tube;
and the other part of nitrified liquid in the nitrified liquid backflow discharge area flows back to the anoxic area through an exhaust-nitrified liquid diversion pipe 17-1 passing through the precipitated clear water discharge unit.
The precipitation clear water discharge unit can be arranged in the same tower body between the three-phase contact aerobic zone and the anoxic zone as required, and can also be arranged outside the tower body; the operation is carried out in a mode of lifting sludge self-return by sewage inflow or lifting sludge self-flow by sewage self-flow; if the sedimentation clear water discharging unit is arranged in the barrel body, an annular overflow groove 21-1 is arranged on the inner wall of the barrel of the sedimentation clear water discharging unit; the outer wall of the barrel corresponding to the annular overflow groove is provided with a clean water discharge port 22-1. A sawtooth-shaped overflow port is arranged above the annular overflow groove; a conical sludge settling shaker 23-1 is arranged below the barrel overflow tank, and a flow meter and a flow control valve are arranged in a sludge return pipe of a sludge discharge system at the bottom of the conical sludge settling shaker; returning part of the sludge subjected to solid-liquid separation in the precipitation device to an anoxic zone for retreatment, and dehydrating and drying part of the sludge; and discharging the supernatant of the solid-liquid separation layer after precipitation.
The sedimentation clear water discharge unit comprises a sedimentation area 4, a central guide flow cylinder 19-1 is arranged in the center of the sedimentation area, the upper end opening of the guide flow pipe is flush with the nitrified liquid collecting tank or higher than the bottom of the nitrified liquid collecting tank, and a conical water baffle plate 20 is arranged at the lower end opening of the guide flow pipe; an overflow tank and a clear water discharge port are arranged on the periphery of the upper part of the sedimentation tank; the bottom of the sedimentation tank is provided with a conical sludge hopper, and the bottom of the conical sludge hopper is connected with a sludge discharge pipe, a sludge discharge valve and a sludge reflux amount control valve which are arranged on the sludge discharge pipe; and returning the sludge to the filtering area. The treated sewage is discharged through a clear water discharge port 22.
For the A/O tower with large sewage treatment capacity and large cross-sectional area of the cylinder, the precipitation clear water discharge unit is preferably not arranged in the same tower. The cylinder is externally provided with a lift pump, a carbon source adding device, sewage, sludge, electricity and gas supply control facilities, namely a water inlet flow regulating valve and a flowmeter which are arranged outside the cylinder or attached to the outer wall of the cylinder and connected with a water inlet and sewage outlet; an anoxic mixed liquid lift pump, a flow regulating valve and a flowmeter which are connected with the water outlet of the anoxic procedure; fan, elevator pump switch and flow frequency conversion control facility.
The application provides a lack of oxygen district, water distribution district, filtering area, three-phase contact aerobic zone and sediment clear water discharge unit among the integrated device, according to circumstances such as sewage treatment design scale, sewage treatment land used permission, 4 or all setting in above district are in a tower type device. In the application, the anoxic hydrolysis area is preferably arranged below the ground, and the filtering area and the three-phase contact aerobic area are arranged above the ground.
The integrated device is used for treating the nitrogen-containing sewage, only needs to lift the sewage once, and supplies oxygen and air by the low-pressure fan or the fan, so that the energy consumption is low and the noise is low; the effect of obviously improving the removal load and efficiency of pollutants (COD, ammonia nitrogen, total nitrogen, malodorous gas and the like) compared with the prior plane type A/O treatment process is achieved.
In summary, compared with the prior art, the device provided by the present application has the following advantages:
(1) oxygen supply effect and treatment effect comparison: 1. the oxygen supply effect, the application adopts a three-phase contact gas supply method for supplying oxygen, and the boundary oxygen content of the biological strain is theoretically improved to 25 percent from 0.684mg/l in the prior art compared with the two-phase contact biological oxidation method by the existing A/O method, so that the boundary oxygen content is greatly improved; 2. the treatment effect is that biological microorganisms in the device grow and propagate in an oxygen-enriched state, the strain density and the biological activity of the treatment device are greatly improved, more dominant strains with large oxygen consumption, strong biological activity and strong pollutant degradation capability can be cultivated, so that the removal load of pollutants in unit volume of the treatment device is improved, the COD, ammonia nitrogen and total nitrogen of treated effluent of a town sewage treatment plant are superior to the pollutant discharge standard (GB18718-2002) standard of the town sewage treatment plant, and the COD, ammonia nitrogen and total nitrogen of treated effluent of a rural biochemical sewage treatment terminal are superior to the water pollutant discharge standard (DB33/973 + 2015) standard of rural domestic sewage treatment facilities in Zhejiang province; when the method is applied to industrial organic wastewater treatment, the COD, ammonia nitrogen and total nitrogen of effluent are superior to the primary standard of Integrated wastewater discharge Standard (GB 8978-1996);
(2) and (3) energy consumption comparison: this application adopts low pressure air feed technique to compare with current AO method high pressure air feed technique, the fan wind pressure is reduced 50 ~ 1000Pa low pressure fan by 40000 ~ 70000Pa and has replaced high pressure positive blower, the fan energy saving consumption saves 50 ~ 70%, the elevator pump energy consumption, this application flows automatically and gets into the oxygen deficiency pond that is located underground, nitrify the liquid and flow back to the oxygen deficiency pond, sewage only once promotes, but the lifting capacity is the lift before the current AO method sewage oxygen deficiency pond and nitrify the sum of liquid backward flow promotion, sewage promotes highly because this application AO tower height is higher than current AO biochemical pond, corresponding energy consumption increases about 20%, this application is synthesized the energy consumption and is compared with current AO method and is saved about 20 ~ 30%. Does not need to build a fan room, does not need to install an aeration head or an aeration pipe, has technical construction investment and does not produce noise pollution.
(3) Building and structure land occupation comparison: the application discloses a vertical stacking setting technology for each process. Compared with the existing A/O method plane stepped arrangement technology, the procedure vertical overlapping arrangement technology enables aerobic procedures with the floor area about 3 times of that of the anoxic procedures to be overlapped on the anoxic tank, and zero floor area of the aerobic procedures is achieved; according to the method, a fan room does not need to be built, and the occupied area of the fan room is saved by 50-70% compared with that of the existing A/O method. Compared with the simple A/O + artificial wetland method for treating the rural domestic sewage, the method saves 60-80% of land.
(4) And (3) comparing the construction cost: in view of the device three-phase contact good oxygen (O), filter, 3 district's of water distribution all are the operation under the state of not ponding, and this regional perisporium only needs to bear 50 ~ 1000 Pa's wind pressure, and ordinary panels such as light thin wall metal, plastics or guarantor board are adopted to this application perisporium, and the perisporium does not have the antiseep requirement to take modes such as welding, tongue and groove embedding bolt fastening to assemble, and material cost is low, and the installation is swift. Compared with the existing A/O method, the manufacturing cost of the peripheral wall of the tank (needing pressure bearing and leakage prevention, needing to build a thick-wall reinforced concrete or a thick steel plate tank wall) saves 60-70%, and compared with the existing A/O method, the equipment cost reduces the cost of a fan and saves the purchase and installation cost of an air distribution system aeration pipe, a valve and a head; however, compared with the existing A/O method, the water distribution system needs to be added, the filler support and the filler are added, the construction cost is increased by 30-50% compared with the activated sludge method, and the comprehensive construction cost is saved by about 20% compared with the existing A/O method.
(5) Comparing the operating environments: 1. the deodorization effect is realized by that ammonia, hydrogen sulfide and odor are generated in the anoxic (A) process, the odor rises to a low-pressure air supply chamber and is mixed with air to form a mixed gas cyclone, the odor is cooperatively input into a three-phase contact aerobic zone positioned above the low-pressure air supply chamber to carry out biological deodorization, and is contacted with biological strains in sewage water drops and biological membrane strains attached to a filler, the organic plant nutrients of the aerobic biological membrane strains in the sewage are absorbed, oxygen in the air is a respiratory oxygen source to degrade COD (chemical oxygen demand) and ammonia nitrogen in the sewage to form nitrate nitrogen, and simultaneously, the oxygen, the hydrogen sulfide and the odor in the mixed gas are absorbed together, so that the ammonia is nitrified to form nitrate nitrogen, the hydrogen sulfide and the odor are adsorbed and purified by a biological membrane with a high specific surface, the effect of cooperative treatment of the odor is generated, and the concentration of the odor at the tower top reaches the odor pollutant discharge standard93) Ammonia<1.5mg/m3Hydrogen sulfide<0.061.5mg/m3Odor concentration<20 (dimensionless), ammonia, hydrogen sulfide and odor generated in the anoxic (A) procedure of the existing A/O method process need to be covered and collected and matched with a waste gas treatment facility, and experimental data are detailed in cases. 2. The noise reduction effect, this application adopts 50 ~ 1000Pa low pressure blower to replace 40000 ~ 70000Pa high pressure blower, and equipment noise falls to below 60 decibels by original 80 ~ 85 decibels.
In the application, the method for treating organic sewage in cities and towns, rural areas, industry and the like by adopting the integrated device in the technical scheme preferably comprises the following steps:
and (3) carrying out anoxic zone treatment on urban and rural domestic sewage to be treated, lifting and conveying effluent, distributing the effluent, and then sequentially carrying out filtration, aerobic treatment, nitration liquid reflux discharge and sludge precipitation reflux clear water discharge to obtain treated sewage.
In the application, the concentration of anoxic bacteria sludge is 15-30% V/V during anoxic treatment; the concentration of dissolved oxygen is 0.2-0.6 mg/L; the retention time is 3-8 hr, and the concentration of the added denitrification carbon source is controlled to be 3-5: 1.
The water distribution preferably adopts perforated pipe water distribution, the perforation aperture is 5-10 mm, and the perforation interval is 100-200 mm.
The material of the filter material adopted in the filtration is quartz sand; the particle size of the quartz sand is 3-5 mm, and the thickness of the filtering layer is 200 mm.
During aerobic treatment, the material of the filler adopted in the aerobic zone is polyurethane sponge; the density of the filler is 50-60% V/V; the wind pressure of the air supply area is preferably 50-1000 Pa, and more preferably 60-700 Pa; the reflux ratio of the nitrifying liquid is 2.0-3.0: 1.
When the sludge sediment is returned to clear water for discharge treatment, the overflowing speed of the sediment zone is 0.3-0.4 m/h; the sludge reflux ratio is 35-40%.
In the application, the organic sewage containing COD and nitrogen to be treated comprises one or more of organic sewage containing COD and nitrogen generated in cities and towns, rural areas, gathering areas and industries.
For further explanation of the present application, the integrated apparatus for biological treatment of nitrogen-containing organic wastewater by an a/O tower provided in the present application will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present application.
Example 1
Overview (one): 1, treating the object, namely rural domestic sewage; 2, treatment scale, 30 t/d; 3, equipment name: the A/O tower nitrogen-containing organic sewage treatment integrated machine adopts the technical scheme; 4, a treatment process of equipment, wherein 5 processes of oxygen deficiency (A), water distribution lifting, filtering, three-phase contact aerobic (O) and sludge precipitation backflow clear water discharging are arranged in the integrated machine;
(II) main technical parameters:
1, the parameters of an anoxic (A) pool, the retention time is 4hr, and the adding amount ratio C/N of a denitrification carbon source is 3-5; the anaerobic sludge is applied at a concentration of 15-30% V/V and dissolved oxygen of 0.2-0.6 mg/l, and the sludge is stirred by adopting hydraulic stirring;
2 water distribution parameters are improved, and the flow is improved by 5m3H, the lift is 10m, and the power is 0.75 KW; a water distributor: water is distributed by the perforated pipe, the perforation aperture is 5mm, the perforation distance is 100mm, and the height of the water distribution device from the lower filtering layer is 200 mm;
3, filter layer parameters: the filter material is quartz sand, the particle size is 3-5 mm, and the thickness of the filter layer is 200 mm;
4 three-phase contact aerobic (O) parameters: the retention time is 8hr, the biological filler material polyurethane sponge, the filler installation density is 55% (V/V), the low pressure fan wind pressure is 60Pa, and the wind volume is 5000m3H, the power is 0.38KW, and the reflux ratio of the nitrified liquid is 3: 1;
5, sedimentation tank parameters, sedimentation zone overflow speed of 0.4m/h and sludge reflux ratio of 35 percent;
(III) treatment Effect (laboratory one month detection statistical average)
Raw water before treatment: COD96.2mg/l, ammonia nitrogen 38.1mg/l, total nitrogen 45.6mg/l, total phosphorus 2.23 mg/l;
draining after treatment: COD38.7mg/l, removal rate 59.77%; 4.24mg/l of ammonia nitrogen and 88.87% of removal rate; total nitrogen is 12.6mg/l, and the removal rate is 72.37%; total phosphorus is 0.88mg/l, and the removal rate is 60.54%;
the rural domestic sewage discharge standard (national standard-free, provincial and urban range), COD 30-80 mg/l, ammonia nitrogen 1.5-15 mg/l, total nitrogen 15-20 mg/l, total phosphorus 0.30-2 mg/l;
odor emission test results at the top of the cylinder: the odor concentration is 16 (dimensionless), which is superior to the odor pollutant emission standard, class II region, and the odor concentration limit value is 20 (dimensionless) standard.
Example 2:
overview (one): 1, treating the object, namely dairy product processing wastewater; 2, treatment scale, 20 t/d; 3, equipment name: the A/O tower nitrogen-containing organic sewage treatment integrated machine adopts the technical scheme; 4, a treatment process of equipment, wherein 5 processes of oxygen deficiency (A), water distribution lifting, filtering, three-phase contact aerobic (O) and sludge precipitation backflow clear water discharging are arranged in the integrated machine;
(II) main technical parameters:
1. the anaerobic pool (A) has parameters, the retention time is 6hr, and the adding amount ratio C/N of the denitrification carbon source is 3-5; the anaerobic bacteria sludge concentration is 20-30% V/V, the dissolved oxygen is 0.2-0.4 mg/l, and the sludge stirring adopts hydraulic stirring.
2. The water distribution parameters are improved, and the flow is improved by 5m3H, the lift is 10m, and the power is 0.75 KW; a water distributor: the perforated pipe distributes water, the perforation aperture is 5mm, the perforation distance is 100mm, and the vertical height of the water outlet of the water distribution device from the lower filtering layer is 200 mm;
3. parameters of a filter layer: the filter material is quartz sand, the particle size is 3-5 mm, and the thickness of the filter layer is 200 mm;
4. three-phase contact aerobic (O) parameters: the retention time is 12hr, the biological filler material polyurethane sponge, the filler installation density is 55% (V/V), the low pressure fan wind pressure is 60Pa, and the wind volume is 5000m3H, the power is 0.38KW, and the reflux ratio of the nitrified liquid is 3: 1;
5. parameters of a sedimentation tank, the overflow speed of a sedimentation area is 0.30m/h, and the sludge reflux ratio is 40 percent;
(III) treatment Effect (laboratory one month detection statistical average)
Raw water before treatment: COD510.6mg/l, ammonia nitrogen 66.2mg/l, total nitrogen 67.5mg/l, total phosphorus 2.10 mg/l;
draining after treatment: COD89.4mg/l, the removal rate is 82.50 percent; ammonia nitrogen is 12.4mg/l, and the removal rate is 81.3 percent; total nitrogen is 20.2mg/l, and the removal rate is 70.1 percent; total phosphorus 0.82mg/l, removal rate 61.0786 i%;
integrated wastewater discharge Standard (GB8978-1996) Primary Standard: COD100mg/l, ammonia nitrogen 15mg/l, total nitrogen 22.7mg/l, phosphate 0.30 mg/l;
odor emission test results at the top of the cylinder: the odor concentration is 16 (dimensionless), which is superior to the odor pollutant emission standard, class II region, and the odor concentration limit value is 20 (dimensionless) standard.
Example 3:
overview (one): 1. treating object, urban industrial and domestic comprehensive sewage; 2. the treatment scale is 10000 t/d; 3. The device name: the three-phase contact A/O tower of the technical scheme is adopted; 4, a treatment process of equipment, wherein an A/O tower is internally provided with 4 working procedures of oxygen deficiency (A), water distribution lifting, filtering and three-phase contact aerobic (O);
(II) main technical parameters:
1. the anaerobic pool (A) has parameters, the retention time is 3 hours, and the adding amount ratio C/N of the denitrification carbon source is 3-5; the anaerobic bacteria sludge concentration is 20-30% V/V, the dissolved oxygen is 0.2-0.6 mg/l, and 4 submersible stirrers are adopted for stirring the sludge.
2. Lifting water distribution area parameter and lifting pump flow rate of 270m 32, the lift is 14m, and the power of each unit is 15 KW; a water distributor: the perforated pipe distributes water, the perforation aperture is 10mm, the perforation distance is 200mm, and the height of the water distribution device from the lower filtering layer is 500 mm;
3. parameters of a filter layer: the filter material is quartz sand, the particle size is 3-5 mm, and the thickness of the filter layer is 200 mm;
4. three-phase contact aerobic (O) parameters: the retention time is 9hr, the biological filler material polyurethane sponge, the filler installation density is 55% (V/V), the low pressure fan is 5, the wind pressure is 180Pa, and the wind volume is 10000m3H, the single power is 0.75KW, and the reflux ratio of the nitrified liquid is 2.5: 1;
5. parameters of a sedimentation tank, the overflow speed of a sedimentation area is 0.40m/h, and the sludge reflux ratio is 40 percent;
(III) treatment Effect (laboratory one month detection statistical average)
Raw water before treatment: COD114.12mg/l, ammonia nitrogen 11.38mg/l, total nitrogen 41.73mg/l, total phosphorus 0.87 mg/l;
draining after treatment: COD56.8mg/l, removal rate 82.50%; 4.84mg/l of ammonia nitrogen and 74.43% of removal rate; total nitrogen is 9.16mg/l, and the removal rate is 78.05%; total phosphorus is 0.52mg/l, and the removal rate is 40.02 percent;
discharge Standard of pollutants for municipal wastewater treatment plants (GB18918-2002) first-class A Standard: COD is 60mg/l, ammonia nitrogen is 5mg/l, total nitrogen is 15mg/l, and total phosphorus is 2.0 mg/l;
odor emission test results at the top of the cylinder: the odor concentration is 16 (dimensionless), which is superior to the odor pollutant emission standard, class II region, and the odor concentration limit value is 20 (dimensionless) standard.
From the above embodiments, the present application provides an integrated apparatus for biological treatment of organic sewage containing COD and nitrogen by an a/O tower, comprising a cylinder; a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom; the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone; a sewage inlet arranged in the anoxic zone; the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone. The device integrates water distribution, filtration, three-phase contact aerobic, nitrified liquid reflux discharge and oxygen deficiency, and saves the occupied area. The device has higher pollutant removal load per unit volume. The aerobic zone can cooperatively treat odor generated by the anoxic zone; the removal rate of COD, ammonia nitrogen and total nitrogen is higher.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (7)
1. An integrated device for biological treatment of organic sewage containing COD and nitrogen by an A/O tower is characterized by comprising a cylinder body;
a water distribution area, a filtering area, a three-phase contact aerobic area, a nitrifying liquid reflux discharge area and an anoxic area are sequentially arranged in the barrel from top to bottom;
the three-phase contact aerobic zone is a non-ponding zone normal pressure high oxygen biomembrane packing zone;
a sewage inlet arranged in the anoxic zone;
the water outlet of the anoxic zone is communicated with the water inlet of the water distribution zone.
2. The integrated apparatus of claim 1, wherein the three-phase contact aerobic zone comprises a cyclone gas supply zone and an aerobic zone disposed directly above the cyclone gas supply zone;
the cylinder wall of the rotational flow air supply area is provided with a low-pressure fan, and low-pressure air is supplied to the rotational flow air supply area through an air inlet;
the rotational flow gas supply area is communicated with the nitrifying liquid backflow discharge area.
3. The integrated apparatus of claim 1, further comprising a sedimented clean water discharge unit; the sedimentation clear water discharge unit is provided with a sludge discharge port and a sludge discharge pipe connected with the discharge port;
the sludge discharge pipe is provided with a redundant sludge discharge port and a return sludge control valve; the return sludge control valve conveys return sludge and sewage treated by the anoxic zone to the water distribution zone;
the sedimentation clear water discharge unit is arranged in the barrel and is positioned between the nitrification liquid reflux discharge area and the anoxic area; or is arranged outside the cylinder body;
and discharging part of the nitrified liquid in the nitrified liquid reflux discharge area into a precipitation clear water discharge unit.
4. The integrated apparatus of claim 3, wherein if the sedimentation clean water discharge unit is disposed outside the barrel;
the nitrified liquid backflow discharge area in the cylinder body comprises a nitrified liquid collecting tank;
a nitrified liquid discharge port and an exhaust hole are arranged at the bottom of the nitrified liquid collecting tank; the nitrifying liquid discharge port is connected with a nitrifying liquid guide pipe 17-2; the exhaust hole exhausts the gas generated in the anoxic zone to the rotational flow gas supply zone;
the lower part of the nitrifying liquid diversion well is provided with a nitrifying liquid reflux port and a nitrifying liquid discharge port;
the nitrifying liquid reflux port is communicated with the anoxic zone; the nitrified liquid discharge port is connected to a water inlet of the sedimentation clear water discharge unit positioned outside the barrel body through a pipeline.
5. The integrated apparatus as claimed in claim 3, wherein if the sedimentation clean water discharge unit is disposed in the barrel, the nitrified liquid reflux discharge area in the barrel comprises a nitrified liquid collecting tank;
an exhaust-nitrification liquid diversion pipe 17-1 and a central diversion cylinder 19-1 which are arranged at the bottom of the nitrification liquid collecting tank;
the exhaust-nitrification liquid guide pipe discharges gas in the anoxic zone to the rotational flow gas supply zone and partial nitrification liquid enters the precipitation clear water discharge unit through the central guide cylinder;
and the other part of nitrified liquid in the nitrified liquid backflow discharge area flows back to the anoxic area through an exhaust-nitrified liquid diversion pipe 17-1 passing through the precipitated clear water discharge unit.
6. The integrated device of claim 1, wherein the filtering area is a filtering layer of quartz sand, common sand or granular activated carbon with a particle size of 3-50 mm and a thickness of 50-300 mm; or a mesh-shaped filter plate or a porous filter plate.
7. The integrated device of claim 3, wherein if the precipitated clear water discharging unit is arranged in the barrel, an annular overflow groove is arranged on the inner wall of the barrel of the precipitated clear water discharging unit;
and a clear water discharge port is formed in the outer wall of the barrel corresponding to the annular overflow groove.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022036759A1 (en) * | 2020-08-18 | 2022-02-24 | 浙江海河环境科技有限公司 | Integrated device and method for biological treatment of organic sewage containing cod and nitrogen via a/o tower |
| US11905194B1 (en) * | 2022-09-28 | 2024-02-20 | Zhejiang Haihe Environmental Technology Co., Ltd. | Deep denitrification treatment system for wastewater by anaerobic-anoxic-oxic based on high-oxygen three-phase contact |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022036759A1 (en) * | 2020-08-18 | 2022-02-24 | 浙江海河环境科技有限公司 | Integrated device and method for biological treatment of organic sewage containing cod and nitrogen via a/o tower |
| US11905194B1 (en) * | 2022-09-28 | 2024-02-20 | Zhejiang Haihe Environmental Technology Co., Ltd. | Deep denitrification treatment system for wastewater by anaerobic-anoxic-oxic based on high-oxygen three-phase contact |
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