CN-121990732-A - Device and method for preventing and controlling underground water of valley type historical legacy pollution source

CN121990732ACN 121990732 ACN121990732 ACN 121990732ACN-121990732-A

Abstract

The invention relates to the technical field of environmental remediation and discloses a device and a method for preventing and controlling underground water of a valley type historical legacy pollution source, wherein the device comprises an anti-flushing panel and a water retaining wall paved on the surface of a valley, the anti-flushing panel and the water retaining wall are used for realizing the diversion of surface water and underground water, and a water guide wall of a water inlet area and a water outlet area is arranged below the surface. The water inlet side is combined with a peripheral waterproof curtain to intercept polluted underground water, and the polluted underground water is completely introduced into the buried PRB pool. The PRB pool is internally provided with baffle walls, oxidation areas and adsorption fixing areas, and assembled modular stuffing boxes capable of being lifted and detached for replacement are arranged in the reduction areas, the oxidation areas and the adsorption fixing areas. The invention realizes the sewage disposal diversion and unpowered catchment, carries out the grading purification of the combined pollution, solves the defects of easy blockage and difficult replacement of the traditional filler by combining the modularized filler with the on-line monitoring, and ensures the water quality safety of the underground water for a long time.

Inventors

ZHANG HAIJING
ZHU BO
LIU XUANZHI
XIAO WU
HOU XUEYONG
CHEN JINSONG
HE JIE
LIU DEHUA

Assignees

中国电建集团中南勘测设计研究院有限公司
中电建环保科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260408

Claims (10)

1. The utility model provides a valley type historical legacy pollution source groundwater prevention and control device, groundwater prevention and control device sets up in the valley department of historical legacy pollution source low reaches, its characterized in that, groundwater prevention and control device includes: The water inlet area anti-flushing panel (1) and the water outlet area anti-flushing panel (7), wherein the water inlet area anti-flushing panel (1) is paved on the surface of the upstream end of a valley, the water outlet area anti-flushing panel (7) is paved on the surface of the downstream end of the valley, and the water inlet area anti-flushing panel (1) and the water outlet area anti-flushing panel (7) are used for guiding surface runoffs and realizing the diversion of surface water and underground water, and the water inlet area anti-flushing panel (1) is provided with a water facing end and a tail end, and the water facing end is downwards bent and embedded into the underground; The water inlet area water guide wall (2), the water inlet area water guide wall (2) is arranged at the tail end of the water inlet area anti-flushing panel (1) and goes deep into the ground, and is used for collecting the infiltrated polluted underground water; The water retaining wall (3) is arranged at the tail end of the water inlet area anti-flushing panel (1) and positioned on the ground surface, and is used for blocking surface water and buffering and storing water; The PRB pool (4) is arranged under the ground at the downstream of the water retaining wall (3), an assembled modularized stuffing box (408) is arranged in the PRB pool (4), the water inlet area water guide wall (2) is abutted against and communicated with the upstream water inlet side of the PRB pool (4), and the collected groundwater flows into the PRB pool (4) for purification treatment; a waterproof curtain (5), wherein the waterproof curtain (5) is arranged in a stratum below the upstream water inlet side of the PRB pool (4) and mountain strata at two sides and is used for blocking polluted underground water and guiding the polluted underground water to flow through the PRB pool (4); the water outlet area water guide wall (6), water outlet area water guide wall (6) set up in PRB pond (4) low reaches just be located the underground of water outlet area scour protection panel (7) below, water outlet area water guide wall (6) with the downstream play water side intercommunication of PRB pond (4) is used for with groundwater after PRB pond (4) purification is discharged.
2. The valley type historical legacy pollution source groundwater prevention and control device according to claim 1, wherein the PRB pool (4) is a hierarchical partition buried structure, a water inlet area (403), a reduction area (405), an oxidation area (406), an adsorption fixing area (407) and a water outlet area (411) are sequentially arranged along the water flow direction, and a gate (404) is arranged between the water inlet area (403) and the reduction area (405); The assembled modular stuffing box (408) is arranged in parallel in the reduction zone (405), the oxidation zone (406) and the adsorption fixing zone (407).
3. The valley type historic legacy pollution source groundwater prevention and control device according to claim 2, wherein the PRB pool (4) further comprises an upstream outer side wall, a downstream outer side wall, and a plurality of inner partition walls (8) dividing the PRB pool (4) into the water inlet zone (403), the reduction zone (405), the oxidation zone (406), the adsorption fixing zone (407), and the water outlet zone (411); The upstream outer side wall, the downstream outer side wall and the inner partition walls (8) are provided with water holes (402); The water hole on the upstream outer side wall is arranged on the upper part close to the top plate of the PRB pool (4) and is communicated with the water guide wall (6) of the water outlet area; The water holes on the inner partition walls (8) are staggered at the upper part or the lower part of the inner partition walls (8) so as to guide groundwater to form up-down baffling among the partitions, and the groundwater flow direction of the whole PRB pool (4) is lower in and upper out; And a reinforced mesh (401) for sealing holes is fixedly arranged at the water passing hole (402) corresponding to the upstream outer side wall of the water inlet area (403) and the downstream outer side wall of the water outlet area (411).
4. The valley type historical legacy pollution source groundwater prevention and control device according to claim 1, wherein a concrete cover plate (409) and a water stop rubber plate (410) are sequentially arranged at the top of the PRB pool (4) from top to bottom; And a lifting hook is arranged on the concrete cover plate (409) and is used for lifting and replacing the assembled modular stuffing box (408).
5. The valley type historic legacy pollution source groundwater prevention and control device according to claim 2, wherein: On-line monitoring equipment is arranged in the water inlet area (403) and the water outlet area (411) of the PRB pool (4) and used for monitoring the concentration of pollutants in groundwater in real time.
6. The valley type historic legacy pollution source groundwater prevention and control device according to claim 1, wherein: the inside of the water inlet area water guide wall (2) and the inside of the water outlet area water guide wall (6) are filled with pebbles with the particle size of 20-40 mm, and the periphery of the pebbles is coated with nonwoven geotextile; The bottom of the water guide wall (2) of the water inlet area is paved with a compacted clay water stop layer which is connected with the waterproof curtain (5) to seal an underground underwater seepage passage.
7. The valley type historic legacy pollution source groundwater prevention and control device according to claim 1, wherein: the water inlet area impact-resistant panel (1) and the water outlet area impact-resistant panel (7) are plain concrete panels with the thickness not less than 100 mm; A broken stone backfill layer is arranged below the water inlet area anti-flushing panel (1), and the bottom of the broken stone backfill layer is flush with the bottom of the water inlet area water guide wall (2); the water retaining wall (3) is a plain concrete wall, and the height of the water retaining wall is at least 500mm higher than the ground at the bottom of a ditch.
8. The valley type historic legacy pollution source groundwater prevention and control device according to claim 1, wherein: the bottom of the waterproof curtain (5) extends downwards into the underground weak weathered stratum, and two sides of the waterproof curtain extend outwards into the mountain stratum.
9. A method for controlling groundwater from a valley type historic residual pollution source based on a control device according to any one of claims 1 to 8, comprising the steps of: the method comprises the steps of utilizing a water inlet area anti-flushing panel (1) and a water outlet area anti-flushing panel (7) paved on the ground to realize the diversion of surface runoffs, reducing the surface water seepage, intercepting the surface mountain torrents by utilizing a water retaining wall (3) and playing a role in buffering and storing water; Collecting the infiltrated polluted underground water by utilizing a water guide wall (2) of the water inlet area, and introducing the polluted underground water into a buried PRB pool (4) under the common diversion and blocking actions of compacted clay at the bottom and a peripheral waterproof curtain (5); Step three, groundwater entering the PRB pool (4) sequentially flows through a water inlet area (403), a reduction area (405), an oxidation area (406) and an adsorption fixing area (407), and heavy metals and organic matters in the groundwater are subjected to graded reduction, oxidation and adsorption fixing through an internal assembly type modularized stuffing box (408); And fourthly, the purified underground water enters a water outlet area (411), and is discharged to a downstream environment through a water guide wall (6) of the water outlet area after reaching the standard through detection of on-line monitoring equipment.
10. The method for preventing and controlling the underground water of the valley type historical legacy pollution source according to claim 9, wherein the method comprises the following steps of: in the fourth step, the pollutant concentrations of the water inlet area (403) and the water outlet area (411) are compared in real time through the on-line monitoring equipment, and the reactivity of the filler in the assembled modular stuffing box (408) is estimated; when the monitoring data show that the activity of the filler is reduced so that the water quality of the effluent is close to the exceeding critical value, a concrete cover plate (409) at the top of the PRB pool (4) is opened, and the inactivated assembled modular stuffing box (408) is lifted out integrally and replaced by a new stuffing box.

Description

Device and method for preventing and controlling underground water of valley type historical legacy pollution source Technical Field The invention relates to the technical field of environmental remediation, in particular to a device and a method for preventing and controlling underground water of a valley type historical legacy pollution source. Background At present, leaching water, waste mine hole water and landfill leachate which are generated in pollution concentration areas of mine tailing ponds, waste residue landfill ponds, refuse landfill and other areas and contain heavy metals and high concentration of organic pollutants often enter surrounding water bodies and agricultural lands through surface runoff, underground water seepage and other ways, so that the quality of underground water is seriously polluted. As an emerging green low-carbon pollution prevention and control technology, the permeable reactive barrier technology (PRB) has the advantages of low energy consumption, simple and convenient management and capability of long-term treatment of polluted underground water. However, existing conventional PRB reactive fillers are typically monolithic, permanent, and difficult to replace. As the contaminants flow with the groundwater into the active packing region, the packing activity gradually decreases as the reaction proceeds. These deactivated fillers not only constitute a potential secondary source of pollution to the groundwater, but also cause the reactive filler pores to become plugged. After the blockage occurs, the pollution plume can bypass the blocked reaction filler, so that the actual restoration effect of the underground water is difficult to be ensured for a long time. Disclosure of Invention Aiming at the problem of groundwater pollution caused by surface runoff and underground water seepage of the historic pollution sources of the valley topography, the invention provides a device and a method for preventing and controlling groundwater of the historic pollution sources of the valley topography. The method aims at intercepting and collecting polluted groundwater through a specific intercepting and blocking structure, and solves the technical defects that the traditional PRB reaction filler is easy to block and difficult to replace after deactivation and has secondary pollution risk by utilizing the assembled modular filler of the grading partition, thereby realizing durable and efficient groundwater purification. The specific technical scheme is as follows: the utility model provides a valley type historical legacy pollution source groundwater prevention and control device, groundwater prevention and control device sets up in the valley department of historical legacy pollution source low reaches, its characterized in that, groundwater prevention and control device includes: The system comprises a water inlet area anti-flushing panel and a water outlet area anti-flushing panel, wherein the water inlet area anti-flushing panel is paved on the surface of the upstream end of a valley, the water outlet area anti-flushing panel is paved on the surface of the downstream end of the valley, and the water inlet area anti-flushing panel and the water outlet area anti-flushing panel are used for guiding surface runoffs and realizing the diversion of surface water and underground water; the water guide wall of the water inlet area is arranged at the tail end of the water inlet area anti-flushing panel and penetrates deep into the ground and is used for collecting the infiltrated polluted underground water; the water retaining wall is arranged at the tail end of the water inlet area anti-flushing panel and positioned on the ground surface and used for blocking surface water and buffering water storage; The PRB pool is arranged under the ground at the downstream of the water retaining wall, an assembled modularized stuffing box is arranged in the PRB pool, the water guide wall of the water inlet area is abutted against and communicated with the upstream water inlet side of the PRB pool, and the collected underground water flows into the PRB pool for purification treatment; a waterproof curtain arranged in the stratum at the upper water inlet side of the PRB pool and the mountain stratum at both sides for intercepting the polluted groundwater and guiding the polluted groundwater to flow through the PRB pool, and The water outlet area water guide wall is arranged at the downstream of the PRB pool and is positioned under the underground of the water outlet area impact-resistant panel, and the water outlet area water guide wall is communicated with the downstream water outlet side of the PRB pool and is used for discharging the purified underground water of the PRB pool. In a preferred implementation manner, the PRB pool is a hierarchical and partitioned buried structure, and is sequentially provided with a water inlet area, a reduction area, an oxidation area, an adsorption fixing area and a wate