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CN-121972500-A - Integrated ecological treatment device for soil remediation and sewage purification

CN121972500ACN 121972500 ACN121972500 ACN 121972500ACN-121972500-A

Abstract

The application discloses an integrated ecological treatment device for soil remediation and sewage purification, which comprises a vertical flow artificial wet area, a horizontal subsurface flow artificial wet area and an ecological purification area which are sequentially arranged along the water flow direction, so that the soil remediation and the sewage purification are organically combined, sewage can be purified, heavy metal migration to soil can be blocked, polluted soil can be repaired in situ, the polluted soil resource utilization can be realized by the composite filler in the vertical flow artificial wet area, multiple pollutants can be removed by the composite filler in the horizontal subsurface flow artificial wet area in a targeted manner, the microbial activity is improved by matching with intermittent aeration, the efficient green treatment of sewage and soil is realized, the in-situ soil remediation and sewage pretreatment are realized in the vertical flow artificial wet area, the pollutants are deeply purified and prevented from leaking in the horizontal subsurface flow artificial wet area, the deep nitrogen and phosphorus removal and heavy metal absorption at the tail end of the ecological purification area can effectively avoid the risk of secondary pollution, and the stable water quality of effluent can be ensured to reach the standard.

Inventors

  • WANG SHUANG

Assignees

  • 上海华闵环境股份有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (9)

  1. 1. An integrated ecological treatment device for soil remediation and sewage purification is characterized by comprising a vertical flow artificial wet area (1), a horizontal subsurface flow artificial wet area (2) and an ecological purification area (3) which are sequentially arranged along the water flow direction, The vertical flow artificial wet land (1) is provided with a supporting layer (11), a first composite filler layer (12) and a first plant layer (13) from bottom to top, the first composite filler layer (12) comprises soil, zeolite and biochar infected by heavy metals, the bottom of the vertical flow artificial wet land (1) is provided with a water collecting pipe (14), the bottom of the first composite filler layer (12) is provided with an aeration disc (15), and the aeration disc (15) is connected with an external aerator and is used for intermittently supplying oxygen to the bottom of the first composite filler layer (12); the horizontal subsurface flow constructed wetland zone (2) is provided with an impermeable layer (21), a second composite filler layer (22) and a second plant layer (23) from bottom to top, the second composite filler layer (22) comprises limestone, slag and active alumina, the water collecting pipe (14) is respectively connected with the water outlet end of the vertical flow constructed wetland zone (1) and the water inlet end of the horizontal subsurface flow constructed wetland zone (2), and water flows horizontally pass through the second composite filler layer (22) in a subsurface flow mode; The ecological purification area (3) is an open water area, a biological floating bed (32) is arranged in the ecological purification area (3), and aquatic plants (31) for deep denitrification and dephosphorization and heavy metal absorption are planted on the biological floating bed (32).
  2. 2. An integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein the first plant layer (13) is planted with one or more of reed, typha and calamus, and the second plant layer (23) is planted with one or more of canna, iris and rush.
  3. 3. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein in the vertical flow artificial wet area (1), the first composite filler layer (12) is divided into three layers from top to bottom, the upper layer is a mixed layer of biochar and soil infected by heavy metals, the middle layer is a zeolite layer, and the lower layer is a mixed layer of zeolite and soil infected by heavy metals.
  4. 4. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein the water collecting pipe (14) is provided with a flow regulating valve (16) for dynamically regulating hydraulic retention time according to the quality of inflow water, so that the hydraulic retention time of the vertical flow artificial wet area (1) is 6-12 hours, and the hydraulic retention time of the horizontal subsurface flow artificial wet area (2) is 12-24 hours.
  5. 5. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein the volumetric mixing ratio of zeolite to biochar in the first composite filler layer (12) is 2:1, and the volumetric mixing ratio of limestone, slag and activated alumina in the second composite filler layer (22) is 2:1:1.
  6. 6. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein an artificial aquatic weed (33) is laid at the bottom of the ecological purification area (3), and the artificial aquatic weed (33) is a bionic fiber material and is used for providing an attachment carrier for microorganisms in a water body.
  7. 7. An integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein the framework of the biological floating bed (32) is filled with a lightweight porous matrix through which the root systems of the aquatic plants (31) grow and are suspended in water.
  8. 8. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein, The supporting layer (11) is laid by cobblestones and quartz sand in a layered mode, the cobblestones layer is located at the lower portion, the quartz sand layer is located at the upper portion, and a geotextile isolation layer is arranged between the cobblestones layer and the quartz sand layer.
  9. 9. The integrated ecological treatment device for soil remediation and sewage purification according to claim 1, wherein the impermeable layer (21) is a high-density polyethylene geomembrane, a bentonite waterproof layer is paved below the high-density polyethylene geomembrane, and a fine sand protection layer is paved above the high-density polyethylene geomembrane.

Description

Integrated ecological treatment device for soil remediation and sewage purification Technical Field The application relates to the technical field of ecological treatment, in particular to an integrated ecological treatment device for soil remediation and sewage purification. Background At present, soil heavy metal pollution and water pollution become key problems restricting ecological environment treatment, the soil heavy metal pollution and the water pollution are often mutually influenced to form a pollution chain, the soil infected by heavy metal is easy to cause water pollution through rain leaching, the polluted water can further aggravate soil heavy metal accumulation, double threat is brought to ecological environment and human health, and a separate treatment mode is adopted for soil remediation and sewage purification. In the field of soil heavy metal restoration, the current treatment mode mainly comprises three types of physical restoration, chemical restoration and biological restoration. Physical repair such as soil replacement has high cost and large engineering quantity, and is easy to damage the soil structure, chemical repair such as chemical leaching has quick effect, but the use of chemical agents is easy to cause secondary pollution, and simultaneously the soil fertility can be reduced, biological repair such as plant repair has long repair period in a single biological repair mode, has relatively low efficiency and has limited repair effect on complex polluted soil, and the environment is friendly. In the sewage purification field, the constructed wetland is widely applied due to the advantages of being ecological-friendly, low in running cost and the like, but the existing constructed wetland has multiple functions of purifying single sewage, in addition, the traditional constructed wetland mostly adopts single filler, the specific surface area of the filler is limited, the adsorption activity is insufficient, the adsorption interception capability of heavy metal ions in sewage is weak, and the deep purification of pollutants is difficult to realize. Content of the application The present application aims to solve the technical problems in the related art at least to some extent. The application provides an integrated ecological treatment device for soil remediation and sewage purification, which comprises a vertical flow artificial wet area, a horizontal subsurface flow artificial wet area and an ecological purification area, wherein the vertical flow artificial wet area, the horizontal subsurface flow artificial wet area and the ecological purification area are sequentially arranged along the water flow direction, a supporting layer, a first composite filler layer and a first plant layer are arranged in the vertical flow artificial wet area from bottom to top, the first composite filler layer comprises soil infected by heavy metals, zeolite and biochar, a water collecting pipe is arranged at the bottom of the vertical flow artificial wet area, an aeration disc is arranged at the bottom of the first composite filler layer, the aeration disc is connected with an external aerator and is used for intermittent oxygen supply to the bottom of the first composite filler layer, an impermeable layer, a second composite filler layer and a second plant layer are arranged in the horizontal subsurface flow artificial wet area from bottom to top, the water collecting pipe is respectively connected with the water outlet end of the vertical flow artificial wet area and the water inlet end of the horizontal subsurface flow artificial wet area, water flow passes through the second composite filler layer in a water flow horizontal subsurface flow mode, and the ecological purification area is used for absorbing heavy metals in the ecological purification area. In addition, the above-mentioned application may also have the following additional technical features: Specifically, the first plant layer is planted with one or more of reed, typha and calamus, and the second plant layer is planted with one or more of canna, iris and rush. Specifically, in the vertical flow artificial wet area, the first composite filler layer is divided into three layers from top to bottom, wherein the upper layer is a mixed layer of biochar and soil infected by heavy metals, the middle layer is a zeolite layer, and the lower layer is a mixed layer of zeolite and soil infected by heavy metals. Specifically, the water collecting pipe is provided with a flow regulating valve for dynamically regulating the hydraulic retention time according to the quality of the inflow water, so that the hydraulic retention time of the vertical flow artificial wet area is 6-12 hours, and the hydraulic retention time of the horizontal subsurface flow artificial wet area is 12-24 hours. Specifically, in the first composite filler layer, the volume mixing ratio of zeolite to biochar is 2:1, and in the second composite filler layer, the volume mixing