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In-situ remediation method for mining area watershed heavy metal pollution bottom sludge

A technology of polluted sediment and in-situ remediation, which is applied in sludge detoxification, sludge treatment, biological sludge treatment, etc., can solve the problems of affecting the longevity of ecological restoration, poor stability of plant communities, and limitation of vegetation growth and development. To achieve the effect of helping plants absorb and enrich heavy metals, help plants grow and stabilize slopes, and prevent soil erosion

Active Publication Date: 2016-06-29
SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the river channel polluted by heavy metals in the mining area, there are a lot of river sediments, and there are the following problems that need to be solved: (1) Due to the low content of nutrient elements in the sediment matrix of the mining area, the growth and development of vegetation is restricted; (2) Due to the high content of heavy metals in the bottom mud of the mining area, it is poisonous to conventional aquatic plants, resulting in a single variety of plants that can be planted, and the establishment of simple plant communities is poor in stability, which affects the durability of ecological restoration.

Method used

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  • In-situ remediation method for mining area watershed heavy metal pollution bottom sludge
  • In-situ remediation method for mining area watershed heavy metal pollution bottom sludge

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Effect test

Embodiment 1

[0027] The heavy metal polluted bottom mud of a mining area was collected in the field, air-dried, sieved, and divided into large and medium stones, small stones, silt and fine sand, and the bottom mud to be repaired was obtained after the mud was passed through a 2mm sieve, and the basic properties of the bottom mud were analyzed. The results are shown in Table 1. Bottom sludge heavy metal solidification test: Add heavy metal stabilizer as described in patent CN105062495A to the bottom sludge to be repaired at a mass fraction of 2%, stir evenly, keep the water content at 90%, maintain it for 15 days, and take samples. The content of available heavy metals in sediment was determined by DTPA extraction ICP-OES.

[0028] Table 1 Basic properties of heavy metal-polluted sediment in a mining area watershed

[0029]

[0030] It has been determined that after 15 days of stability with the addition of reagents, the content of effective heavy metals in the DTPA leached sediment si...

Embodiment 2

[0035] refer to figure 2 , in-situ remediation of heavy metal contaminated sediment of the present invention was carried out in the middle reaches of a river in a mining area of ​​Suxian District, Chenzhou City, Hunan Province. In the in-situ restoration of heavy metal-contaminated sediment in this embodiment, first select a 100-meter-long river section with a slope below 35°, and screen the river sediment into large and medium stones, pebbles, silt and fine sand. Make full use of large and medium stones to pile up and fix with barbed wire to form a slope protection wall 1, and the height of the slope protection wall 1 is higher than the normal water level by more than 50cm. The slope protection wall 1 is built by using the original stones in the bottom mud to make full use of the existing resources and reduce the cost. On the side close to the slope protection wall 1 near the bank, an impermeable barrier layer 2 is provided with clay for filling the pores of the slope prote...

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Abstract

The invention discloses an in-situ remediation method for mining area watershed heavy metal pollution bottom sludge.The method includes the following steps that a slope wall is arranged; a bank side riverbed slope is leveled, and a layer of geotextile is laid on the bank side riverbed slope; the mining area watershed heavy metal pollution bottom sludge is obtained to be stirred and mixed with a heavy metal pollution restoration agent, and the mixture is laid on the geotextile and stabilized for a certain period of time to form a restoration bottom sludge layer; plants are planted on the restoration bottom sludge layer.By means of the method, on one hand, the problem of riverway pollution bottom sludge accumulation can be solved, and on the other hand, the problem of bottom sludge heavy metal pollution is effectively solved due to addition of a bottom sludge matrix restoration agent and combined planting of riverway plants.Besides, riverway landscape is attractive, and water quality is continuously and effectively improved.Plant intercropping is beneficial to restoration of bottom sludge polluted by heavy metal and stabilization of the slope, and soil and water loss is prevented.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution control, in particular to an in-situ repair method for heavy metal polluted sediment in a mining area watershed. Background technique [0002] In the process of my country's modernization and development, a large number of mineral resources have been mined, smelted and processed. With years of mining, mineral processing, smelting, and later industrial wastewater such as chemical industry and electroplating, etc. are continuously discharged into the surrounding environment, causing serious heavy metal pollution in rivers, lakes and other water bodies. Under the action of oxidation and reduction, etc., the water phase is transferred from the water phase to the solid phase, and finally deposited in the sediment and gradually enriched, so that the content of heavy metals in the sediment is often several orders of magnitude higher than that in the water, causing serious pollution. Under ...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/02
CPCY02A20/402C02F11/004C02F11/02C02F2303/06
Inventor 任重许闯黄雷黄聪龚亚龙张时伟裴东辉赵亮许建新刘婷
Owner SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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