CN108275782B - Integrated three-dimensional wetland sewage treatment effluent TN control device and method - Google Patents
Integrated three-dimensional wetland sewage treatment effluent TN control device and method Download PDFInfo
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- CN108275782B CN108275782B CN201810195478.2A CN201810195478A CN108275782B CN 108275782 B CN108275782 B CN 108275782B CN 201810195478 A CN201810195478 A CN 201810195478A CN 108275782 B CN108275782 B CN 108275782B
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- 239000010865 sewage Substances 0.000 title claims abstract description 134
- 238000011282 treatment Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000000746 purification Methods 0.000 claims abstract description 83
- 239000010802 sludge Substances 0.000 claims abstract description 35
- 239000000945 filler Substances 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 15
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 15
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 15
- 239000010455 vermiculite Substances 0.000 claims abstract description 15
- 241000196324 Embryophyta Species 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000003818 cinder Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 235000007849 Lepidium sativum Nutrition 0.000 claims description 3
- 244000211187 Lepidium sativum Species 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 238000005273 aeration Methods 0.000 claims description 2
- 230000001706 oxygenating effect Effects 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 51
- 239000002352 surface water Substances 0.000 description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 241000209134 Arundinaria Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Botany (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention provides an integrated three-dimensional wetland sewage treatment effluent TN control device and method, wherein the treatment device comprises a sewage pretreatment area, a horizontal flow wetland sewage purification area, a vertical flow wetland sludge purification area and a vertical flow sewage purification area, wherein the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are arranged above the sewage pretreatment area in parallel; the vertical flow sewage purification area is arranged on the side edge and is separated by a concrete structure, the vertical flow sewage purification area is sequentially provided with a rubble layer, a natural vermiculite layer, a river sand layer and a biological filler ball layer from top to bottom, each layer is assembled in a modular manner, and the filling ratio of the biological filler balls in the biological filler ball layer is 20% -65%. The device can reduce the nitrogen content in the sewage and reduce the harm of harmful substances in rural domestic drainage to the surrounding water environment. The method has the advantages of small occupied area, stable treatment effect, convenient operation and management and no secondary pollution, and is suitable for various sewage treatments.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an integrated three-dimensional wetland sewage treatment effluent TN control device and method, which can reduce the contents of nitrogen, phosphorus and organic matters in domestic sewage, thereby achieving the effect of protecting water environment and being particularly suitable for rural areas in China.
Background
China is a large agricultural country, has a plurality of population, and has a water resource occupation of about 2200m per capita 3 Less than 1/4 of the world's average level, water resources are severely starved. Along with the continuous improvement of the economic level of China, the living standard of people is increasingly improved, and the problem of water environment deterioration is also valued by people. But people only pay attention to the water environment problem of the city, so that the water pollution condition of rural areas, especially the domestic sewage problem of rural areas, is neglected.
Kitchen sewage, clean sewage, toilet bath sewage and the like discharged by residents in rural areas in daily life are collectively called rural domestic sewage. Compared with the domestic sewage of urban residents, the domestic sewage of rural residents is single in life mode, and the water consumption per capita is low, so that the overall sewage discharge amount of rural areas is far lower than that of urban areas, and the domestic sewage treatment problem of the rural areas in China is not paid enough attention to local governments. Moreover, the water supply facilities in rural areas of China are too simple, tap water is not fully popularized, and the rural domestic sewage causes serious pollution to the surrounding environment. Meanwhile, the village residence areas in rural areas of China are irregular, so that domestic sewage in rural areas has strong dispersibility and randomness, and a centralized sewage treatment mode is difficult to be adopted as in urban areas. Moreover, the rural area sewage has large water quality fluctuation, generally does not contain pollutants such as heavy metals, toxins and harmful substances, and only contains a certain amount of nitrogen and phosphorus elements, and meanwhile, the rural domestic sewage in China has stronger biochemistry and relatively lower pollution concentration.
The area of the rural area of China occupies about 90 percent of the total area of the country, and the total discharge amount of the rural domestic sewage occupies more than 20 percent of the total discharge amount of the domestic sewage of the country. In China, rural residents have no environmental protection consciousness, and daily life sewage is directly discharged into surrounding rivers or lakes without being treated, so that the serious phenomenon of eutrophication of water bodies such as rivers, lakes and the like in rural areas is caused, the living environment of the rural residents is severely polluted, and the healthy life of the residents in the rural areas is very unfavorable.
At present, the constructed wetland is widely applied to the aspect of water treatment, 201410150093.6 discloses a composite constructed wetland treatment system, which is characterized in that a vertical flow constructed wetland treatment tank is arranged at the water inlet end of the system, a subsurface flow constructed wetland treatment tank is arranged at the water outlet end of the system, the system also comprises a water distribution tank, a guide wall is arranged in the water distribution tank, the water distribution tank is positioned at the water inlet end of the system, and a water outlet of the water distribution tank is communicated with a water inlet pipe of the vertical flow constructed wetland treatment tank, and a filler in the vertical flow constructed wetland treatment tank is sequentially provided with a coarse grain diameter filler layer, a medium grain diameter filler layer and a fine grain diameter filler layer from bottom to top. The treatment system does not consider the problem of filler blockage, and the construction engineering amount is large and the construction is complex when the filler is replaced. 201610873243.5A high-efficiency purification system for artificial wetland is characterized by comprising 3-5 processing units, wherein each processing unit comprises a filtering body, plants, an organic layer, a first filtering layer, a second filtering layer, a biological layer, three filtering layers and an impermeable plate, the impermeable layer is arranged at the bottom of each processing unit at one side of a water inlet of the processing unit, impermeable walls are arranged at two ends of the impermeable layers, sewage or low-pollution water to be purified enters the artificial wetland through a water inlet pipe and sequentially passes through the processing units to be purified, and finally is discharged into a water collecting tank through a water outlet pipe. The method has the advantages of single treatment mode, low operation efficiency of the constructed wetland and unstable treatment effect when the temperature is low in winter.
The invention has small occupied area, stable treatment effect, convenient operation and management and no secondary pollution, and is suitable for various sewage treatments.
Disclosure of Invention
The invention aims at solving the problem of rural domestic sewage pollution control, and provides an integrated three-dimensional wetland sewage treatment effluent TN control device and method.
The technical solution is as follows: in order to achieve the technical aim, the invention provides an integrated three-dimensional wetland sewage treatment effluent TN control device, which comprises a sewage pretreatment area, a horizontal flow wetland sewage purification area, a vertical flow wetland sludge purification area and a vertical flow sewage purification area, wherein the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are arranged above the sewage pretreatment area in parallel, and a matrix layer is arranged below the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area and is separated from the sewage pretreatment area by a concrete structure; the horizontal flow wetland sewage purification area is used for carrying out primary purification treatment on sewage, and the vertical flow wetland sludge purification area is used for carrying out drying treatment on suspended matters, sediment and other impurities in the sewage. The vertical flow sewage purification area is arranged at the side edges of the horizontal flow wetland sewage purification area, the vertical flow wetland sludge purification area and the sewage pretreatment area and is separated by a concrete structure, the vertical flow sewage purification area is sequentially provided with a rubble layer, a natural vermiculite layer, a river sand layer and a biological filling ball layer from top to bottom, each layer is assembled in a modular manner, and the filling ratio of the biological filling balls in the biological filling ball layer can be set to be 20% -65% according to different effluent quality requirements and different temperature conditions. Specifically, when the air temperature is more than 12 ℃, different filling ratios of the biological filling ball areas can be selected to reach different surface water environment quality standards. TN can reach the quality V standard of the surface water environment at the filling ratio of 45%; TN can reach the quality IV standard of the surface water environment under the filling ratio of 60 percent. When the air temperature is less than 12 ℃, the artificial wetland treatment efficiency is lower, and the filling ratio is required to be increased to reach the required water quality standard. When the filling ratio is less than 60%, TN can not reach the quality V standard of the surface water environment; TN can reach the quality V standard of the surface water environment under the filling ratio of 60 percent. The highest filling ratio must not exceed 65%.
The sewage pretreatment area is an adjusting tank, and a sludge pump, a sewage pump and an air pump are arranged in the adjusting tank, wherein impurities are precipitated at the bottom of the adjusting tank and pumped to the upper vertical flow wetland sludge purification area by the sludge pump, so that the vertical flow sewage purification area can be recycled while being prevented from being blocked. Sewage in the regulating tank is pumped into a horizontal flow wetland sewage purification area by a sewage pump and then is treated by a vertical flow sewage purification area; the air pump is used for oxygenating and aerating the river sand layer and the biological filling ball layer through the pipeline.
Preferably, the volume ratio of the sewage pretreatment area, the horizontal flow wetland sewage purification area, the vertical flow wetland sludge purification area and the vertical flow sewage purification area is (0.9-1.08): (0.48-0.675): (0.06-0.15): 1.
the integrated three-dimensional wetland sewage treatment device is designed to be any one of 3m multiplied by 4m, 4m multiplied by 5m multiplied by 4m and 5m multiplied by 6m multiplied by 4m.
The horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are separated by a plastic partition board, and aquatic plants are planted in the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area.
The crushed stone layer, the natural vermiculite layer, the river sand layer and the biological filling ball layer are respectively separated by a steel wire filter screen, and the volume ratio of the crushed stone layer to the natural vermiculite layer to the river sand layer to the biological filling ball layer is (0.4-1): (0.6-1): (0.8-1): (1.2-2).
The river sand layer and the biological filling ball layer are aerated and oxygenated by an air pump, and the aeration intensity is 1.5-2.0 m 3 /m 2 ·h。
The substrate layers of the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are coal cinder, the depth of the substrate is designed to be 10-30 cm, and the aquatic plants are cane shoots or cress. Preferably, the aquatic plants have a planting density of 16 plants per square meter or more. Preferably, the grain diameter of the cinder is 4-6 mm, the specific surface area is 0.25-0.35 m 2 /g。
The particle size of the crushed stone layer is 5-10 mm; the grain diameter of the natural vermiculite layer is 2-5 mm, and the specific surface area is 400-600 m 2 Per gram, pore volume of 0.2-0.4 cm 2 /g; the grain diameter of the river sand layer is 2-4 mm; the biological filling ball layer is spherical filling balls with raised surfaces made of polyethylene or polypropylene plastic, and the surface area of the biological filling ball layer is 800-2500 m 2 /m 3 Density of 2-4 kg/m 3 The diameter is 0.04-0.06 m. The invention further provides the integrated three-dimensional wetland sewage treatment device for sewageA method of processing comprising the steps of:
firstly, sewage is completely discharged into an adjusting tank, sewage in the adjusting tank is adjusted and primarily settled, and impurities are settled at the bottom and pumped into a vertical flow wetland sludge purification area at the upper part by a sludge pump; sewage in the regulating tank is pumped into a sewage purification area of the horizontal flow wetland by a sewage pump, and sequentially passes through a crushed stone layer, a natural vermiculite layer, a river sand layer and a biological filler layer in the vertical section purification area to be purified; when the temperature is less than 12 ℃, most plants die, the microbial activity is reduced, the treatment efficiency of the constructed wetland is lower, and the filling ratio of the biological filler ball layer can be increased to improve the purification effect.
The integrated wetland sewage treatment device is arranged in a courtyard of a rural family, domestic sewage is firstly discharged into an adjusting tank and is pumped to 2 subareas of a miniature constructed wetland by a pump, and the sewage passes through a horizontal flow wetland sewage purification area and is purified by crushed stone, natural vermiculite, river sand and biological purification balls in a vertical flow sewage purification area. When the temperature is lower in winter, the artificial wetland treatment efficiency is lower, and sewage can be directly pumped into a vertical flow sewage purification area for purification treatment. The packing material of the vertical flow sewage purification zone can be conveniently replaced and treated through an openable door at one side after the purification device is operated for a period of time. Thereby achieving the effect of effectively treating sewage for a long time.
The invention has the advantages that:
(1) The invention adopts a compact integrated three-dimensional structure, compared with the traditional constructed wetland, the floor area is reduced by more than 40 percent, the investment cost is reduced by more than 20 percent, and the invention has the advantages of small floor area, investment saving, operation management and convenient maintenance;
(2) The filter material of the vertical sewage purification area in the integrated three-dimensional constructed wetland device is replaceable, and coal cinder is adopted, so that compared with the traditional constructed wetland, the operation cost is reduced by more than 30%, and the integrated three-dimensional constructed wetland device is suitable for various sewage;
(3) The integrated three-dimensional constructed wetland device adopts step-by-step treatment of different partitions, the SS removal rate is more than 90%, the nitrogen and phosphorus removal rate is more than 80%, the sludge is also 100% reduced, and no secondary pollution is generated. The reasonable space layout delays the blockage of the wetland and improves the membrane hanging effect and the microbial degradation effect of the filter material. When the air temperature is less than 12 ℃, the treatment effect can be enhanced by adjusting and controlling the filling ratio, and the stability of the effluent TN is improved.
Drawings
FIG. 1 is a cross-sectional view of an integrated three-dimensional wetland sewage treatment device frame.
Fig. 2 is a top view of the integrated three-dimensional wetland sewage treatment device.
Wherein 1 is a concrete frame, 2 is a plastic partition plate, 3 is a fine steel wire filter screen, 4 is aquatic plants, 5 is a sludge pump, 6 is a clean water pump, 7 is an air pump, and 8 is a miniature constructed wetland substrate.
Detailed Description
Example 1: the invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, an integrated wetland sewage treatment device is constructed by using concrete 1, a plastic partition board 2 and a steel wire filter screen 3, and the device has the size of 3m multiplied by 4m. The device is designed into 4 subareas, namely a sewage pretreatment area, a horizontal flow wetland sewage purification area, a vertical flow wetland sludge purification area and a vertical flow sewage purification area, wherein the volume ratio of the 4 subareas is set as 1:0.6:0.15:1. the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are separated by a plastic partition board, the two wetlands are planted with aquatic plants 4, and the matrix 8 is designed to be cinder (the grain diameter is 4-6 mm, the specific surface area is 0.25-0.35 m) with obvious nitrogen and phosphorus adsorption effect 2 And/g), the depth of the matrix is designed to be 25cm, the aquatic plants 4 are selected from economic plants such as cane shoots, cress and the like, and the planting density is 18 plants per square meter. The root of the aquatic plant is utilized to absorb nitrogen, so that the primary removal effect is achieved. The vertical flow sewage purification area is divided into 4 layers by a steel wire filter screen (3) with the fineness (aperture value of 0.8+/-0.02 mm), wherein a rubble layer, a natural vermiculite layer, a river sand layer and a biological filling ball layer are sequentially arranged from top to bottom, and the volume ratio of the 4 filling material layers is 0.5:0.7:0.9:1.4, each layer of filler adopts modular assembly, so that the filler in the device can be replaced conveniently and regularly. Domestic sewage is firstly discharged into the regulating tank and is pumped to 2 partitions of the micro constructed wetland by the pump, and the sewage is purified by the sewage of the horizontal flow wetlandAnd the area is subjected to purifying treatment by crushed stone, natural vermiculite, river sand and biological purifying balls in the vertical flow sewage purifying area in sequence.
The integral three-dimensional wetland sewage treatment device has the characteristics that the water quality of inlet water is TN: 10-25 mg/L, NH 4 + -N：11～20mg/L，NO 3 - -N: 0.5-3 mg/L, SS: 100-200 mg/L. Through the step-by-step treatment of different partitions, the final nitrogen removal rate is more than 80%, the sludge is also reduced by 100%, and the SS removal rate is more than 90%. And the invention adopts a compact integrated three-dimensional structure, and compared with the traditional constructed wetland, the invention has the advantages of more than 40 percent of occupied area and more than 20 percent of investment cost.
In fig. 1, arrows indicate water flow directions, domestic sewage is firstly discharged into an adjusting tank and is pumped to 2 subareas of the miniature artificial wetland by a pump, the sewage flows through a clean water wetland treatment area and is purified by a crushed stone layer, a natural vermiculite layer, a river sand layer and a biological filling ball layer in a vertical sectional purification area. When the air temperature is more than 12 ℃, different filling ratios of the biological filling ball areas can be selected to reach different surface water environment quality standards. When the water quality requirement of the effluent is higher, TN can reach the quality V standard of the surface water environment under the filling ratio of 45%; TN can reach the quality IV standard of the surface water environment under the filling ratio of 60 percent. The effects of specific implementation modes (the quality standard of the surface water environment GB3838-2002, the quality standard of the surface water environment V class: TN is less than or equal to 2.0mg/L, and the quality standard of the surface water environment IV class: TN is less than or equal to 1.5 mg/L) are shown in the table 1.
Table 1 treatment effect of sewage passing through each section of purification zone at different filling ratios of the bio-filler ball layer:
example 2: this embodiment differs from embodiment 1 in that: when the air temperature is less than 12 ℃, the artificial wetland treatment efficiency is lower, and the filling ratio is required to be increased to reach the required water quality standard. When the filling ratio is less than 60%, TN can not reach the quality V standard of the surface water environment; TN can reach the quality V standard of the surface water environment under the filling ratio of 60 percent. The effects of the embodiments are shown in Table 1.
Claims (5)
1. The integrated three-dimensional wetland sewage treatment effluent TN control device is characterized by comprising a sewage pretreatment area, a horizontal flow wetland sewage purification area, a vertical flow wetland sludge purification area and a vertical flow sewage purification area, wherein the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area are arranged above the sewage pretreatment area in parallel, a matrix layer is arranged below the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area, and the matrix layer of the horizontal flow wetland sewage purification area and the vertical flow wetland sludge purification area is separated from the sewage pretreatment area by a concrete structure; the vertical flow sewage purification zone is arranged at the side edges of the horizontal flow wetland sewage purification zone, the vertical flow wetland sludge purification zone and the sewage pretreatment zone and is separated by a concrete structure, the vertical flow sewage purification zone is sequentially provided with a rubble layer, a natural vermiculite layer, a river sand layer and a biological filler ball layer from top to bottom, each layer is assembled by adopting a module, the filling ratio of the biological filler balls in the biological filler ball layer is 20% -65%, aquatic plants are planted in the horizontal flow wetland sewage purification zone and the vertical flow wetland sludge purification zone, the substrate layers of the horizontal flow wetland sewage purification zone and the vertical flow wetland sludge purification zone are coal cinder, the substrate depth is designed to be 10-30 cm, the aquatic plant is cane shoots or cress, the sewage pretreatment area is an adjusting tank, a sludge pump, a sewage pump and an air pump are arranged in the adjusting tank, the air pump is used for oxygenating and aerating a river sand layer and a biological filling ball layer through a pipeline, the river sand layer and the biological filling ball layer are aerated and oxygenated through the air pump, the aeration strength is 1.5-2.0 m < 3 >/m < 2 >. H, the size of the integrated three-dimensional wetland sewage treatment effluent TN control device is designed to be any one of 3m < 4 >, 4m < 5 > m < 4 > and 5m < 6 > m < 4 > m, and the volume ratio of the sewage pretreatment area, the horizontal flow wetland sewage purification area, the vertical flow wetland sludge purification area and the vertical flow sewage purification area is 0.9-1.08): (0.48-0.675): (0.06-0.15): 1, the volume ratio of the crushed stone layer, the natural vermiculite layer, the river sand layer and the biological filling ball layer is (0.4-1): (0.6-1): (0.8-1): (1.2-2), wherein the particle size of the crushed stone layer is 5-10 mm; the particle size of the natural vermiculite layer is 2-5 mm, the specific surface area is 400-600 m < 2 >/g, and the pore volume is 0.2-0.4 cm < 2 >/g; the particle size of the river sand layer is 2-4 mm; the bio-filler ball layer is a spherical filler ball with a raised surface, which is made of polyethylene or polypropylene plastic, the surface area of the bio-filler ball layer is 800-2500 m < 2 >/m < 3 >, the density of the bio-filler ball layer is 2-4 kg/m < 3 >, and the diameter of the bio-filler ball layer is 0.04-0.06 m.
2. The integrated stereoscopic wetland sewage treatment effluent TN control device according to claim 1, wherein the impurities are precipitated at the bottom of the regulating tank and pumped by the sludge pump to the upper vertical flow wetland sludge purification zone; sewage in the regulating tank is pumped into a horizontal flow wetland sewage purification area by a sewage pump and then is treated by a vertical flow sewage purification area.
3. The integrated stereoscopic wetland sewage treatment effluent TN control device according to claim 1, wherein the horizontal flow wetland sewage purification zone and the vertical flow wetland sludge purification zone are separated by a plastic partition.
4. The integrated three-dimensional wetland sewage treatment effluent TN control device of claim 1, wherein the crushed stone layer, the natural vermiculite layer, the river sand layer and the biological filler ball layer are separated by a steel wire filter screen, respectively.
5. A method for sewage treatment by using the integrated three-dimensional wetland sewage treatment effluent TN control device as claimed in claim 1, comprising the steps of:
firstly, sewage is completely discharged into an adjusting tank, sewage in the adjusting tank is adjusted and primarily settled, and impurities are settled at the bottom and pumped into a vertical flow wetland sludge purification area at the upper part by a sludge pump; sewage in the regulating tank is pumped into a sewage purification area of the horizontal flow wetland by a sewage pump, and sequentially passes through a crushed stone layer, a natural vermiculite layer, a river sand layer and a biological filler layer in the vertical section purification area to be purified; when the temperature is less than 12 ℃, the filling ratio of the bio-filler ball layer is increased to improve the purifying effect.
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| CN108275782B true CN108275782B (en) | 2023-11-03 |
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| CN112047477B (en) * | 2020-07-10 | 2022-11-04 | 东北师范大学 | Composite flow constructed wetland domestic sewage purification system |
| CN113683200B (en) * | 2021-09-02 | 2023-04-18 | 北京七星文旅生态科技有限责任公司 | Composite reciprocating type constructed wetland water body purification system and water body purification method |
| CN114956460A (en) * | 2022-05-30 | 2022-08-30 | 镇江市给排水管理处 | Horizontal subsurface flow wetland structure for sewage treatment and construction method thereof |
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