CN218232111U - Biological enhanced sewage infiltration system - Google Patents
Biological enhanced sewage infiltration system Download PDFInfo
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- CN218232111U CN218232111U CN202222337118.6U CN202222337118U CN218232111U CN 218232111 U CN218232111 U CN 218232111U CN 202222337118 U CN202222337118 U CN 202222337118U CN 218232111 U CN218232111 U CN 218232111U
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- 229910052760 oxygen Inorganic materials 0.000 claims description 11
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Biological Treatment Of Waste Water (AREA)
Abstract
The utility model relates to a sewage treatment system, in particular to a biologically enhanced sewage infiltration system, which comprises a water-dispersing and water-distributing layer, a coarse filtration layer, a blast aeration layer, a fine filtration layer, a slow-release packing layer, an anaerobic cavity body and a drain pipe communicated with the anaerobic cavity body, wherein the water-dispersing and water-distributing layer, the coarse filtration layer, the blast aeration layer, the fine filtration layer, the slow-release packing layer and the anaerobic cavity body are vertically arranged and the infiltration coefficient is sequentially reduced; a water distribution pipe net is embedded in the water dispersion and distribution layer; an air distribution pipe network communicated with the blast aerator is embedded in the blast aeration layer; a ventilation pipe network communicated with the atmosphere is embedded in the slow release filler layer; the side walls of the pipe networks are provided with diversion holes at intervals; the anaerobic cavity body comprises an anaerobic reaction area communicated with the slow release packing layer and a precipitation drainage area communicated with the anaerobic reaction area; the drain pipe is communicated with the sedimentation drainage area. Compared with the prior art, the utility model discloses a modularization sewage filtration treatment, can prefabricate, light in weight, convenient transportation is to putting into practice on the spot, can supply the carbon source by oneself after the device operation simultaneously, can solve the lower problem of rural sewage denitrogenation rate.
Description
Technical Field
The utility model relates to a sewage treatment system, in particular to a biologically enhanced sewage infiltration system.
Background
Many rural domestic sewage is discharged to nearby water bodies without being effectively treated, and the health of a local ecological system is influenced. The economic foundation of rural areas is weak, residents are scattered, and the traditional town sewage treatment process is high in cost, complex in operation management and not suitable for sewage treatment of rural areas. The land infiltration system has the advantages of low cost, easy operation and management, good treatment effect on COD, N, P and the like, and is popularized and applied in rural areas. At present, many rural areas have basic sewage treatment facilities (septic tanks, anaerobic treatment devices and small-scale sewage collection systems), and the basic sewage treatment facilities and the land infiltration system are combined to treat rural domestic sewage more efficiently and improve the stability of effluent, so that the modularization and lightening of the infiltration system are realized, and the filtration system is necessary to be put into practical use conveniently and quickly.
The traditional land infiltration system not only needs to carry out civil engineering construction on site, but also has the problems of large occupied area, large influence of temperature, low pollution load capacity, easy blockage of the system and the like. The utility model patent with publication number CN202379844U improves the pollution load capacity of the system through the multilayer water distribution technology, and greatly reduces the required percolation area; the utility model with publication number CN102001743A increases the air blast aeration system, and the air is compressed by the air blast and then diffused in the system in the form of small bubbles, thereby improving the air transfer efficiency, improving the water quality of the effluent and relieving the blockage problem of the traditional land treatment system; the utility model patent with publication number CN103641270A can make the system normally operate under low temperature climate condition by temperature adjusting, ventilating and oxygen supplying, and simultaneously combines high load subsurface infiltration aerobic treatment and advanced treatment facultative treatment, thereby improving the shock load resistance of the system.
However, the above techniques still have the following drawbacks: 1. the C/N of rural domestic sewage is low, a unit for supplementing a carbon source is lacked, the growth of denitrifying bacteria is limited, and the TN removal rate of the system is low; 2. the system needs civil engineering construction, can not be prefabricated in a modularization way, and is difficult to quickly realize the coverage of a large-scale rural area; 3. the components of the system are mostly soil and gravels, and the system is heavy in weight and not easy to transport.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a biological strengthening sewage filtration system for solving at least one of the above-mentioned problem, realized modularization sewage filtration and handled, can prefabricate, light in weight, conveniently transport to drop into the practicality on the spot, can supply the carbon source by oneself after the device operation simultaneously, can solve the lower problem of rural sewage denitrogenation rate.
The purpose of the utility model is realized through the following technical scheme:
a biologically enhanced sewage infiltration system comprises a water dispersing and distributing layer, a coarse filter layer, a blast aeration layer, a fine filter layer, a slow release filler layer, an anaerobic cavity body and a drain pipe communicated with the anaerobic cavity body, which are vertically arranged from top to bottom in sequence;
the percolation coefficients of the water dispersing and distributing layer, the coarse filtering layer, the blast aeration layer, the fine filtering layer and the slow release filler layer are sequentially reduced;
a water distribution pipe network is embedded in the water dispersion and distribution layer, and domestic sewage enters the system through the water distribution pipe network; the air distribution pipe network is embedded in the blast aeration layer and is communicated with the blast aerator to supplement oxygen to the blast aeration layer; a ventilation pipe network is embedded in the slow release filler layer and is communicated with the atmosphere to balance the pressure in the system; the side walls of the water distribution pipe network, the gas distribution pipe network and the ventilation pipe network are provided with diversion holes at intervals;
the anaerobic cavity body comprises an anaerobic reaction area communicated with the slow release filler layer and a precipitation drainage area communicated with the anaerobic reaction area; the drain pipe is communicated with the precipitation drain area;
after entering a water-dispersing and water-distributing layer through a water-distributing pipe network, domestic sewage enters an anaerobic reaction zone to undergo anaerobic decomposition reaction after sequentially percolating through a coarse filtering layer, a blast aeration layer, a fine filtering layer and a slow-release filler layer under the action of gravity, solids generated by the reaction are precipitated in a precipitation and drainage zone, and the rest water is discharged out of the system through a drainage pipe.
Preferably, the filling thickness of the water-dispersing and water-distributing layer and the blast aeration layer is 150-250mm; the filling thickness of the coarse filter layer, the fine filter layer and the slow release filler layer is 250-400mm; the thickness of the anaerobic cavity body is 400-600mm.
Preferably, the pipelines of the water distribution pipe network, the gas distribution pipe network and the ventilation pipe network are all PVC pipes with the pipe diameter of 25-75mm, and diversion holes are arranged at intervals on the end part and the side wall of each pipeline; the water distribution pipe network, the gas distribution pipe network and the ventilation pipe network are vertically arranged, and all pipelines in the water distribution pipe network, the gas distribution pipe network and the ventilation pipe network are parallel to each other and are arranged at an interval of 0.8-1.5 m.
Preferably, the water-dispersing and water-distributing layer and the blast aeration layer are constructed by filling ceramic particles; the grain size of the ceramsite is 16-25mm. Part of the sewage directly percolates to the lower layer under the action of gravity, and the other sewage flows along the lateral direction of the ceramsite and percolates downwards at the same time, so that the sewage can be uniformly distributed on a horizontal plane.
Preferably, the slow release packing layer is formed by mixing and filling large-diameter ceramic particles, small-diameter ceramic particles and corncob packing; the grain diameter of the large-diameter ceramsite is 16-25mm; the particle size of the small-diameter ceramsite is 10-15mm; the grain diameter of the corncob filler is 5-10mm; the volume ratio of the large-diameter ceramsite to the small-diameter ceramsite to the corncob filler is 6:3:1. the volume ratio referred to herein can be basically directly converted into a height ratio (consistent cross section from top to bottom), for example, the layer needs to be filled with 300mm, the large-diameter ceramsite, the small-diameter ceramsite and the corncob filler are respectively used as fillers, and the substances are filled with 180mm, 90mm and 30mm, and it should be noted that the substances are filled in a mixed manner, not in layers.
Preferably, the coarse filtration layer comprises a first coarse filtration sublayer, a second coarse filtration sublayer and a third coarse filtration sublayer which are sequentially arranged from top to bottom; the first coarse filtration sublayer is formed by filling ceramsite with the particle size of 10-20 mm; the second coarse filtration sublayer is constructed by filling zeolite with the particle size of 8-16 mm; the third coarse filtration sublayer is constructed by filling volcanic rock with the particle size of 5-10mm; the filling thickness ratio of the first coarse filtration sublayer, the second coarse filtration sublayer and the third coarse filtration sublayer is 3:1:2; the fine filter layer comprises a first fine filter sublayer, a second fine filter sublayer and a third fine filter sublayer which are sequentially arranged from top to bottom; the first fine filter sublayer is constructed by filling volcanic rocks with the particle size of 3-8 mm; the second fine filter sublayer is constructed by filling quartz sand with the particle size of 5-10mm; the third fine filter sublayer is formed by filling ceramsite with the particle size of 10-15mm; the filling thickness ratio of the first fine filter sublayer to the second fine filter sublayer to the third fine filter sublayer was 2:1:3.
preferably, the anaerobic reaction zone and the precipitation drainage zone are horizontally arranged and are separated by a front partition plate; front partition plate diversion holes are formed in the positions, 300-400mm away from the bottom, of the front partition plates at intervals; the sedimentation drainage area comprises sedimentation areas at two sides and a drainage area in the middle, which are formed by separating a rear partition plate; the rear partition board is provided with rear partition board diversion holes at the positions 200-300mm away from the bottom at intervals; the drain pipe is communicated with the drainage area.
Preferably, the pipeline of the air blowing aerator connected with the air distribution pipe network adopts a heating pipe, and the heating temperature of the heating pipe is 15-25 ℃. When the air temperature is lower in autumn and winter, the air sent out by the blast aeration machine is heated by the heating pipe, so that the temperature of the air sent into the device is kept above 15 ℃, the normal life activity of microorganisms is maintained, and the degradation efficiency of pollutants is guaranteed. Meanwhile, oxygen diffuses from the diversion holes to the periphery in the form of small bubbles, so that the system is prevented from being blocked.
Preferably, a ventilation cap is further arranged at one end of the ventilation pipe network communicated with the atmosphere.
Preferably, the slow release filler layer and the anaerobic cavity body are separated by an upper clapboard, and the upper clapboard is provided with diversion holes at intervals.
Preferably, soft biomembrane filler is hung in the anaerobic reaction zone.
Preferably, the system further comprises a backwash pipe in fluid communication with the anaerobic chamber. The backwash pipe is connected with the anaerobic cavity body, and when needed, the system can be flushed by water through the backwash pipe, so that the system is prevented from being blocked.
Preferably, the system is fixedly installed inside the shell, and the shell and each partition plate arranged inside the shell are made of aluminum alloy. The shell and the partition plates can be modularly prefabricated in a factory, and are light in weight and convenient to transport and use.
The utility model discloses a theory of operation does:
rural domestic sewage from the collection system is subjected to pretreatment means such as oil removal precipitation and filtration, and then intermittently enters the sewage infiltration system through a water pump.
In the system, domestic sewage enters a water distribution layer through a water distribution pipe network, most of the sewage is directly percolated downwards under the action of gravity, and a part of the sewage is percolated downwards while flowing laterally in ceramsite fillers of the water distribution layer, so that the sewage is uniformly distributed on a horizontal plane. Sewage from top to bottom percolates through coarse filtration layer, blast air aeration layer, fine filtration layer and slowly-releasing packing layer in proper order, and sewage percolates and gets into the anterior anaerobic reaction district of anaerobic cavity body through the water conservancy diversion hole of aluminium system baffle behind the slowly-releasing packing layer, stops and gets into the settling zone of cavity body rear portion both sides after reaching certain water level, finally outside the drain pipe eduction gear of drainage zone.
After successful biofilm formation, microorganisms can grow on the surfaces of the fillers of the filler layers in the system to form a biofilm. A small amount of granular organic matters in the sewage are intercepted by the coarse filtering layer, are dispersed in each sublayer (the sublayers of the coarse filtering layer and the fine filtering layer) due to different particle sizes and are decomposed by microorganisms; the dissolved organic matters are adsorbed by the filler and further degraded by the biological film on the surface of the filler; NH (NH) 4 + Converting into NO by nitration under aerobic condition of each packing layer 3 - Then enters an anaerobic cavity body and is removed through denitrification; the phosphorus is mainly removed by the adsorption of each packing layer.
In the sewage infiltration process, the oxygen content is continuously reduced due to the degradation effect of the biomembrane, so that the air-blast aeration machine is matched to intermittently aerate the air-blast aeration layer through the air distribution pipe network (the aeration time interval and the water distribution time interval are synchronous), oxygen is supplemented for the device, the aerobic decomposition effect of microorganisms on pollutants is enhanced, and the pollution load capacity of the infiltration device is improved.
When sewage is percolated through the slow release filler layer, the corncob filler slowly releases granular and dissolved carbon sources, denitrifying bacteria can be attached to the granular carbon source for reaction, the dissolved carbon source enters the anaerobic cavity along with water flow for further denitrification, and NO in the sewage is absorbed 3 - Conversion to N 2 And is discharged out of the device, thereby achieving the effect of removing nitrogen. The ventilation pipe network on the layer is communicated with the outside atmosphere to collect the generated N 2 And redundant gas in the device, and the internal and external air pressure of the device are stabilized.
The sewage seeped from the upper packing layer stays in the anaerobic reaction area, the hydraulic retention time is longer, an anaerobic environment is formed, and the sewage carries out further anaerobic decomposition reaction. The soft biomembrane filler is hung in the area, so that the growth amount of microorganisms is increased, and the purification effect is improved. The solid waste generated by the reaction is firstly precipitated at the bottom of the anaerobic reaction zone, and then enters a drainage zone discharge device after being further precipitated in the precipitation zone.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the percolation coefficient of the filler layer in the percolation system is gradually reduced from top to bottom, the filler particle size in the filler layer on the upper layer is larger, and the percolation time of the sewage is shorter. The fine filtering layer adopts the filler with smaller grain diameter, adjusts the percolation speed of the sewage in the whole filler layer and ensures that the sewage has reasonable hydraulic retention time under aerobic condition.
2. The utility model discloses optimize system architecture, combine traditional land infiltration and sewage anaerobic treatment mutually, select the haydite as basic filler, add slowly-releasing filler (corncob filler) in order to supply the carbon source, have simple structure, the higher advantage of device lightweight and sewage load capacity, but quick input is used, is applicable to the rural domestic sewage treatment who lacks the carbon source.
3. The utility model discloses set up the slowly-releasing filler district, can provide required carbon source by action denitrification reaction certainly, guaranteed the long-term denitrogenation function of system, solved rural domestic sewage C/N lower, denitrogenation effect poor problem.
4. The utility model discloses use prefabricated aluminum alloy device shell, adopt the haydite of light as the basic filler of device, can comparatively convenient and fast ground direct transport to the on-the-spot operation of coming into operation, need not the civil engineering.
5. The utility model discloses set up the anaerobism cavity district, guaranteed going on of denitrification reaction, strengthened the device to the effect of getting rid of the pollutant, prevent the suspended solid concentration of play water too high simultaneously.
Drawings
FIG. 1 is a schematic diagram of the present system;
FIG. 2 is a schematic side sectional view of the system;
FIG. 3 is a schematic view of the construction of the front bulkhead;
FIG. 4 is a schematic view of the construction of the rear bulkhead;
in the figure: 1-water dispersing and distributing layer; 2-water distribution pipe network; 3, a coarse filtering layer; 4-blast aeration layer; 5-gas distribution pipe network; 6-blast aerator; 7-fine filtration layer; 8-a slow release filler layer; 9-a ventilation pipe network; 10-anaerobic reaction zone; 11-a front partition; 12-a sediment drainage zone; 13-a drain pipe; 14-a water stop valve; 15-backwash tube; 16-a ventilator cap; 17-an upper baffle; 18-a precipitation zone; 19-a rear bulkhead; 20-a drainage area; 21-front baffle flow guide holes; 22-rear bulkhead diversion holes.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
A biologically enhanced sewage percolation system, as shown in figure 1-4, comprises a water distribution layer 1 for water dispersion, a rough filtration layer 3, a blast aeration layer 4, a fine filtration layer 7, a slow release packing layer 8, an anaerobic cavity body and a drain pipe 13 communicated with the anaerobic cavity body which are vertically arranged from top to bottom in sequence;
the percolation coefficients of the water dispersing and distributing layer 1, the rough filtering layer 3, the blast aeration layer 4, the fine filtering layer 7 and the slow release filling layer 8 are sequentially reduced;
a water distribution pipe network 2 is embedded in the water dispersion and distribution layer 1, and domestic sewage enters the system through the water distribution pipe network 2; an air distribution pipe network 5 is embedded in the blast aeration layer 4, the air distribution pipe network 5 is communicated with a blast aerator 6, and oxygen is supplemented into the blast aeration layer 4; a ventilation pipe network 9 is embedded in the slow release packing layer 8, and the ventilation pipe network 9 is communicated with the atmosphere to balance the pressure in the system; the water distribution pipe network 2, the gas distribution pipe network 5 and the ventilation pipe network 9 are provided with diversion holes at intervals on the side wall;
the anaerobic cavity body comprises an anaerobic reaction area 10 communicated with the slow release packing layer 8 and a precipitation drainage area 12 communicated with the anaerobic reaction area 10; the drain pipe 13 is communicated with the precipitation drain area 12;
after entering a water dispersion and distribution layer 1 through a water distribution pipe network 2, domestic sewage enters an anaerobic reaction zone 10 to undergo anaerobic decomposition reaction after sequentially percolating through a rough filtering layer 3, a blast aeration layer 4, a fine filtering layer 7 and a slow release filling layer 8 under the action of gravity, solids generated by the reaction are precipitated in a precipitation and drainage zone 12, and the rest water is discharged out of the system through a drainage pipe 13.
More specifically, in the present embodiment:
as shown in fig. 1, the whole system can be divided into an upper filler infiltration area and a lower anaerobic cavity body, wherein the filler infiltration area sequentially comprises a water distribution layer 1, a rough filtration layer 3, a blast aeration layer 4, a fine filtration layer 7 and a slow release packing layer 8 from top to bottom, the anaerobic cavity body comprises an anaerobic reaction area 10 and a precipitation drainage area 12 which are horizontally arranged in tandem, the slow release packing layer 8 and the anaerobic reaction area 10 are separated by an upper partition plate 17 and communicated by an upper partition plate 17 diversion hole arranged on the upper partition plate 17, and the anaerobic reaction area 10 is separated by a front partition plate 11 and a precipitation drainage area 12 and communicated by a front partition plate diversion hole 21 arranged on the front partition plate 11.
The water dispersing and distributing layer 1 and the blast aeration layer 4 are filled with ceramsite with the particle size range of 16mm-25mm (the ceramsite with the particle size in the range can be used, or the ceramsite with the particle size in the range can be filled in a mixed particle size mode, other layers are similar to the ceramsite, repeated description is omitted), and the filling thickness is 200mm; the coarse filtration layer 3 is filled with ceramsite (first coarse filtration sublayer), zeolite (second coarse filtration sublayer) and vesuvianite (third coarse filtration sublayer) in a positive gradation modeFilling the mixture to a thickness of 300mm, specifically adopting 10mm-20mm of ceramsite, 8mm-16mm of zeolite and 5mm-10mm of vesuvianite, wherein the weight ratio of the ceramsite to the zeolite is 3:1:2, filling the mixture with the filling thickness; the fine filtering layer 7 is filled with vesuvianite (a first fine filtering sublayer), quartz sand (a second fine filtering sublayer) and ceramsite (a third fine filtering sublayer) in a negative grading mode, the filling thickness is 300mm, and the vesuvianite with the particle size range of 3mm-8mm, the quartz sand with the particle size range of 5mm-10mm and the ceramsite with the particle size range of 10mm-15mm are filled in a mode of 2:1:3, filling with the filling thickness; the slow release packing layer 8 is filled by mixing ceramsite and corncob filler, the filling thickness is 300mm, and specifically, the slow release packing layer is formed by mixing large-diameter ceramsite (ceramsite with the particle size range of 16-25 mm), small-diameter ceramsite (ceramsite with the particle size range of 10-15 mm) and corncob filler (with the particle size of 10 mm) in a proportion of 6:3:1, to fill the volume ratio. A water distribution pipe network 2 (for introducing domestic sewage) is embedded in the dispersed water distribution layer 1; a gas distribution pipe network 5 is buried in the blast aeration layer 4, and one end of the gas distribution pipe network 5 is communicated with a blast aerator 6 and used for supplementing oxygen inwards; a ventilation pipe network 9 is embedded in the slow release packing layer 8, one end of the ventilation pipe network 9 is communicated with the atmosphere through a ventilation cap 16, and N is discharged outwards 2 And other excess gases, and to maintain a stable pressure within the system. The pipes used in the water distribution pipe network 2, the gas distribution pipe network 5 and the ventilation pipe network 9 are all PVC pipes with the pipe diameter of 25mm, and diversion holes for outwards flowing fluid are uniformly distributed at the top, the bottom and the side edges of the pipes; each pipe network is arranged in a vertical alignment manner, and the pipelines in the pipe networks are arranged in parallel, and the distance between the pipelines is 0.8m.
In this embodiment, the pipeline connecting the air distribution pipe network 5 and the blast aerator 6 adopts a heating pipe, so that the temperature of the air/oxygen fed into the blast aeration layer 4 can be kept above 15 ℃ (controlled within 25 ℃), so as to maintain the normal life activities of microorganisms and ensure the degradation efficiency of pollutants.
As shown in FIG. 2, the height of the anaerobic chamber body is set to 500mm, and the anaerobic reaction zone 10 and the precipitation drainage zone 12 are arranged in tandem. The slow release packing layer 8 is arranged above the anaerobic reaction area 10, the two layers are separated by an upper layer clapboard, and upper layer clapboard guide holes are arranged at intervals on the upper layer clapboard, so that the slow release packing layer 8 can be communicated with the anaerobic reaction area 10. In the anaerobic reaction zone 10, a plurality of suspended soft biomembrane fillers (such as 4 suspended fillers in the anaerobic reaction zone 10 in figure 1, the actual shape can be customized according to the requirements, and the suspended soft biomembrane fillers are mostly used for sewage treatment of the biofilter). A front partition 11 is provided between the anaerobic reaction zone 10 and the precipitation drainage zone 12 to be spaced apart therefrom, and front partition guide holes 21 are provided at positions of the front partition 11 spaced apart from the bottom by a height of 400mm, as shown in fig. 3, through which front partition guide holes 21 the water in the anaerobic reaction zone 10 can be drained into the precipitation drainage zone 12. The precipitation drain 12 is divided into a precipitation zone 18 and a drain 20 by a rear partition 19, wherein the precipitation zone 18 is disposed at both sides and the drain 20 is disposed at the center; the settling zone 18 receives the liquid from the anaerobic reaction zone 10, and the drainage zone 20 is communicated with a drainage pipe 13 for drainage; rear partition guide holes 22 are formed in the rear partition 19 at a position spaced apart from the bottom by a height of 250mm, and as shown in fig. 4, the water in the settling zone 18 is discharged into the drain zone 20 through the rear partition guide holes 22 and then leaves the system through the drain pipe 13. The drain pipe 13 is provided with a water stop valve 14, which can control whether to drain water or not. In addition, the middle position of the bottommost part of the anaerobic cavity body is also communicated with a back flushing pipe 15 with the pipe diameter of 25mm, so that the sludge accumulated inside can be flushed, and the flushed water is discharged out of the system through a water discharge pipe 13.
The system is in the time of intaking, and air blast aeration machine 6 is through air distribution pipe network 5 to the aeration of air blast aeration layer 4, and the air is to the form of bubble diffusion all around, for filtration system oxygenation. The operation mode of the system adopts intermittent water inflow and aeration, the circulation is carried out for 4 times a day, the circulation is carried out once every 6 hours, the water inflow is carried out for 4 hours, and the water inflow is carried out for the next time after the interval of 2 hours. Aeration and water inlet are carried out synchronously, and the aeration time and times are the same as those of water inlet.
Normally, the amount of sludge produced by the device per day is in relative equilibrium with the amount of sludge decomposed. If the device becomes clogged, water can be fed into the backwash pipe 15 to backwash the device, and the backwash effluent is discharged from the device through the drain pipe 13.
The whole system is arranged in the shell, and the shell and the partition plates used in the shell are made of aluminum alloy.
The working principle is as follows:
rural domestic sewage from the collection system is subjected to pretreatment means such as oil removal precipitation and filtration, and then intermittently enters the sewage infiltration system through a water pump.
In the system, domestic sewage enters a water distribution layer 1 of dispersed water through a water distribution pipe network 2, most of the sewage is directly percolated downwards under the action of gravity, and a part of the sewage is percolated downwards while flowing laterally in ceramsite fillers of the water distribution layer 1, so that the sewage is uniformly distributed on a horizontal plane. Sewage percolates from top to bottom in proper order through coarse filtration layer 3, blast aeration layer 4, fine filtration layer 7 and slow release packing layer 8, and sewage percolates and gets into the anterior anaerobic reaction district 10 of anaerobic cavity body through the water conservancy diversion hole of aluminium system baffle behind the slow release packing layer 8, stops and gets into the sedimentation zone 18 of cavity body rear portion both sides after reaching certain water level, finally outside the drain pipe 13 eduction gear through drainage zone 20.
After successful biofilm formation, microorganisms can grow on the surfaces of the fillers of the filler layers in the system to form a biofilm. A small amount of granular organic matters in the sewage are intercepted by the coarse filtering layer 3, are dispersed in each sublayer (the sublayers of the coarse filtering layer 3 and the fine filtering layer 7) due to different particle sizes and are decomposed by microorganisms; the dissolved organic matters are adsorbed by the filler and further degraded by the biological film on the surface of the filler; NH (NH) 4 + Converting into NO by nitration under aerobic condition of each packing layer 3 - Then enters an anaerobic cavity body and is removed through denitrification; the phosphorus is mainly removed by the adsorption of each packing layer.
In the sewage infiltration process, the oxygen content is continuously reduced due to the degradation of the biomembrane, so that the blast aeration machine 6 is used for intermittently aerating the blast aeration layer 4 through the gas distribution pipe network 5 (the aeration time interval and the water distribution time interval are synchronous), oxygen is supplemented for the device, the aerobic decomposition effect of microorganisms on pollutants is enhanced, and the pollution load capacity of the infiltration device is improved.
When sewage is percolated through the slow release filler layer 8, the corncob filler slowly releases granular and dissolved carbon sources, denitrifying bacteria can be attached to the granular carbon source for reaction, the dissolved carbon source enters the anaerobic cavity along with water flow for further denitrification, and NO in the sewage is treated 3 - Conversion to N 2 And is discharged out of the device, thereby achieving the effect of removing nitrogen. The ventilation pipe network 9 on the layer is communicated with the outside atmosphere to collect the generated N 2 And redundant gas in the device, and the internal and external air pressure of the device are stabilized.
The sewage percolated by the upper packing layer stays in the anaerobic reaction zone 10, the hydraulic retention time is longer, an anaerobic environment is formed, and the sewage is subjected to further anaerobic decomposition reaction. The soft biomembrane filler is hung in the area, so that the growth amount of microorganisms is increased, and the purification effect is improved. The water level reaches the height of the front baffle guide holes 21 shown in fig. 3 and then flows to the settling zone 18, and the water level reaches the height of the rear baffle guide holes 22 shown in fig. 4 and then flows into the drain zone 20 and then is discharged out of the apparatus through the drain pipe 13.
The technology is adopted to build a set of high-efficiency biological strengthening sewage infiltration system device in a certain company, the size of the device is that the length is multiplied by the width and multiplied by the height =1300 multiplied by 800 multiplied by 1800mm, and the hydraulic load is 0.6m/d. Through multiple detection and analysis, the concentration ranges of the COD, the SS, the ammonia nitrogen and the total nitrogen of inlet water are respectively 200-270mg/L, 55-65mg/L, 40-50mg/L and 45-60mg/L, and the concentration ranges of the COD, the SS, the ammonia nitrogen and the total nitrogen of outlet water treated by the device are respectively 40-50mg/L, 10-15mg/L, 5-8mg/L and 16-20mg/L, thereby reaching the first class B standard in the national urban sewage plant pollutant discharge standard (GB 18918-2002).
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (9)
1. A biologically enhanced sewage percolation system is characterized by comprising a water distribution layer (1), a rough filtration layer (3), a blast aeration layer (4), a fine filtration layer (7), a slow release packing layer (8), an anaerobic cavity body and a drain pipe (13) communicated with the anaerobic cavity body, which are vertically arranged from top to bottom in sequence;
the percolation coefficients of the water distribution layer (1), the rough filtration layer (3), the blast aeration layer (4), the fine filtration layer (7) and the slow release packing layer (8) are sequentially reduced;
a water distribution pipe network (2) is embedded in the water distribution layer (1), and domestic sewage enters the system through the water distribution pipe network (2); an air distribution pipe network (5) is embedded in the blast aeration layer (4), the air distribution pipe network (5) is communicated with a blast aerator (6), and oxygen is supplemented into the blast aeration layer (4); a ventilation pipe network (9) is embedded in the slow release filler layer (8), and the ventilation pipe network (9) is communicated with the atmosphere to balance the pressure in the system; the side walls of the water distribution pipe network (2), the gas distribution pipe network (5) and the ventilation pipe network (9) are provided with diversion holes at intervals;
the anaerobic cavity body comprises an anaerobic reaction area (10) communicated with the slow release packing layer (8) and a precipitation drainage area (12) communicated with the anaerobic reaction area (10); the drain pipe (13) is communicated with the sedimentation drain area (12);
after entering a water-dispersing and water-distributing layer (1) through a water-distributing pipe network (2), domestic sewage enters an anaerobic reaction zone (10) to undergo anaerobic decomposition reaction after sequentially percolating through a rough filtering layer (3), a blast aeration layer (4), a fine filtering layer (7) and a slow release filling layer (8) under the action of gravity, solid generated by the reaction is precipitated in a precipitation drainage zone (12), and the rest water is discharged out of the system through a drainage pipe (13).
2. The biologically enhanced sewage percolation system according to claim 1, wherein the loading thickness of the water distribution layer (1) and the blast aeration layer (4) is 150-250mm; the filling thickness of the coarse filtration layer (3), the fine filtration layer (7) and the slow release filler layer (8) is 250-400mm; the thickness of the anaerobic cavity body is 400-600mm.
3. The biologically enhanced sewage infiltration system of claim 2, wherein the water distribution layer (1) and the blast aeration layer (4) are constructed by filling with ceramsite; the grain size of the ceramsite is 16-25mm.
4. The biologically enhanced wastewater diafiltration system according to claim 2, wherein said straining layer (3) comprises a first straining sublayer, a second straining sublayer and a third straining sublayer arranged in sequence from top to bottom; the first coarse filtration sublayer is formed by filling ceramsite with the particle size of 10-20 mm; the second coarse filtration sublayer is constructed by filling zeolite with the particle size of 8-16 mm; the third coarse filtration sublayer is constructed by filling volcanic rock with the particle size of 5-10mm; the filling thickness ratio of the first coarse filtration sublayer, the second coarse filtration sublayer and the third coarse filtration sublayer is 3:1:2; the fine filtering layer (7) comprises a first fine filtering sub-layer, a second fine filtering sub-layer and a third fine filtering sub-layer which are sequentially arranged from top to bottom; the first fine filter sublayer is constructed by filling volcanic rocks with the particle size of 3-8 mm; the second fine filter sublayer is constructed by filling quartz sand with the particle size of 5-10mm; the third fine filter sublayer is formed by filling ceramsite with the particle size of 10-15mm; the filling thickness ratio of the first fine filter sublayer to the second fine filter sublayer to the third fine filter sublayer was 2:1:3.
5. the biologically enhanced wastewater diafiltration system according to claim 2, wherein said anaerobic reaction zone (10) is horizontally aligned with the precipitation drainage zone (12), and the anaerobic reaction zone (10) is separated from the precipitation drainage zone (12) by a front partition (11); front partition plate diversion holes (21) are formed in the positions, 300-400mm away from the bottom, of the front partition plates (11) at intervals; the sedimentation drainage area (12) comprises sedimentation areas (18) which are formed by a rear partition plate (19) in a separating way and are positioned at two sides and a drainage area (20) which is positioned at the middle; rear partition baffle diversion holes (22) are formed in the rear partition (19) at a position 200-300mm away from the bottom at intervals; the drain pipe (13) is communicated with the drain area (20).
6. The biologically enhanced sewage percolation system according to claim 1, wherein the pipeline connecting the air distribution network (5) of the blast aerator (6) adopts heating pipes, and the heating temperature of the heating pipes is 15-25 ℃.
7. The bio-augmentation sewage infiltration system according to claim 1, wherein the slow release filler layer (8) is separated from the anaerobic cavity body by an upper partition plate (17), and the upper partition plate (17) is provided with diversion holes at intervals.
8. The bio-augmentation wastewater filtration system according to claim 1, wherein a soft biofilm filler is suspended in the anaerobic reaction zone (10).
9. The system according to claim 1, further comprising a backwash pipe (15) in fluid communication with the anaerobic chamber.
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Effective date of registration: 20231012 Address after: 200092 Siping Road 1239, Shanghai, Yangpu District Patentee after: TONGJI University Patentee after: SHANDONG WENYUAN ENVIRONMENTAL TECHNOLOGY CO.,LTD. Address before: 200092 Siping Road 1239, Shanghai, Yangpu District Patentee before: TONGJI University |