A method and device for purifying ecological ponds of heavy metal polluted irrigation water

Abstract

The invention discloses a method and a device for ecological pond purification treatment of heavy metal-polluted irrigation water. The method comprises the following steps: step 1, selecting a place; step 2, constructing a tertiary ecological pond: performing capacity expansion, deepening, anti-seepage and partition treatment on an existing pond or low-lying land or abandoned land; step 3, constructing an absorption and purification pond: arranging a cement pond at the tail end of the tertiary ecological pond; step 4, putting absorbing materials: filling the materials for absorbing heavy metals at the bottom of the absorption and purification pond; step 5, in a primary ecological pond, planting aquatic plants; 6, in a secondary ecological pond, planting aquatic plants; step 7, in the tertiary ecological pond; planting aquatic plants and performing tertiary purification on the irrigation water. The device comprises the ecological ponds, the absorption and purification pond, a retaining wall, an ecological revetment, anti-seepage geotechnical cloth, a soil layer, a water inlet pipe, a water intake quantity regulating valve, the aquatic plants, the absorbing materials and a water outlet pipe. The device is wide in application scope, high in purification efficiency, simple in structure and easy to operate and manage and effectively reduces the treatment cost of the heavy metal-polluted irrigation water.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution restoration and water purification treatment, and more specifically relates to a method for purifying ecological ponds of heavy metal polluted irrigation water, and also relates to a device for purifying ecological ponds of heavy metal polluted irrigation water, which is suitable for use in my country In the restoration of heavy metal-contaminated cultivated land in southern China, before the irrigation water enters the paddy field, it is treated with multi-stage purification and adsorption purification devices of aquatic plants to reduce the concentration of heavy metals in the irrigation water to the safe production range, which is a low-cost way to reduce heavy metal pollution such as cadmium in the irrigation water. , An effective method that is easy to operate and manage. Background technique [0002] With the rapid development of China's economy, mining, disorderly discharge of industrial ...

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Problems solved by technology

Wang Baying mentioned in "A Combined Constructed Wetland System for Treating Heavy Metal Sewage" [CN201320301718.5] that two constructed wetlands are combined to treat heavy metal sewage. This method has a good effect on nitrogen and phosphorus removal, but not on heavy metal removal. Ideal; Dai Huichao et al. mentioned in "Constructed Wetland System Applicable to Reservoir Bank Treatment of Heavy Metal Polluted Water" [CN201220501174.2] that alkaline reaction pools and two-stage constructed wetlands were used to treat heavy metal polluted water, but the scope of application of this method is Limited and small water output, it is difficult to meet the needs of farmland irrigation water; Liu Jianguo et al. mentioned in "A Method for Efficiently Purifying Heavy Metal Polluted Wastewater with Combination of Wetland Plants" [CN201010290684.5] that planting barnyardgrass, lotus seedlings, bamboo shoots, duck The heavy metals in the waste water can be purified by tongue grass, willow leaf Ruo, and Polygonum sp., but this method is only suitable for shallow water wetland conditions, and as an invasive plant, Neptonia chinensis has certain ecological risks

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