Method of fixing and stabilizing heavy metal Pb in lake bottom mud by using thalia dealbata

A technology of re-spraying and heavy metals, applied in the field of environmental engineering, can solve the problems of unsuitable urban water environment restoration, pollution, etc.

Inactive Publication Date: 2017-10-20
杭州西湖风景名胜区灵隐管理处
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although people have realized that phytoremediation is of great significance in remediating low-level non-point source pollution of heavy metals in soil, water environment, and water environment, most of the hyperaccumulative plants screened out so far are weed species, which are suitable for heavy metal pollution in mines and farmland. Restoration of unsuitable urban water environment

Method used

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  • Method of fixing and stabilizing heavy metal Pb in lake bottom mud by using thalia dealbata
  • Method of fixing and stabilizing heavy metal Pb in lake bottom mud by using thalia dealbata
  • Method of fixing and stabilizing heavy metal Pb in lake bottom mud by using thalia dealbata

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Effect test

Embodiment 1

[0015] Thaliadealbata Fraser ex Roscae should be planted in the shallow water area of ​​the wetland scenic area. It should be planted in clusters in spring, and planted in patches by the poolside and lakeside. After flowering, the division should avoid the rainy season. Cut off the remaining leaves and high branches of the plant. The planting density is 6-8 clumps / m 2 , 1 to 2 plants / clump. Cover the soil tightly after planting. Before the seeds mature in autumn, harvest the aboveground parts and dig out some underground rhizomes for proper treatment, and repeat the process the next year.

[0016] When Zailihua matures, the whole plant or the aboveground part is removed from the planting point, and the second crop is planted in the next year to cooperate with other aquatic plants to reduce the Pb content in the water body and sediment to the environmental safety standard.

[0017] When the Pb concentration in the sediment increased from 0.989mg / kg to 4.71mg / kg, the Pb conce...

Embodiment 2

[0019] The soil for the test was collected from the non-polluted soil in the West Lake area, which is sandy loam, air-dried and finely ground, and passed through a 2mm sieve. Preparation of artificially added Cd-contaminated soil: First, cadmium chloride (high-grade pure) was ground and pulverized separately, and divided into small bags according to the amount of 50.0 kg of soil. The required amount of medicine is calculated as follows, the added concentration of Pb element is: 0.00, 50.0 and 100mg / kg dry soil; the added concentration of Pb in each treatment is determined according to the low and medium non-point source pollution level of Cd in the soil of West Lake Scenic Area ( Zhang Haizhen et al., 2014). Secondly, use the method of gradual mixing to complete the heavy metal addition process, that is, first take out about 0.50 kg of prepared soil and mix it with the weighed medicine by sieving, then gradually add soil, and repeatedly sieve and mix until 50.0 kg of soil Mix...

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Abstract

The invention provides a method of fixing and stabilizing a heavy metal Pb in lake bottom mud by using thalia dealbata. The method comprises the steps of conducting group planting and block planting on the thalia dealbata beside a pool and a lake in a wetland scenic spot in the spring, avoiding post-floral plant division in the plum rain season, cutting of residual leaves and excessive branche of plants, allowing planting density to be 6-8 groves / m<2>, 1-2 plants per grove, covering with soil and compressing after growing, before seed maturation in the autumn, harvesting the overground thalia dealbata, excavating part of underground rhizomes for appropriate treatment, and repeating the process next year. The method can exert an effect of purifying heavy metal Pb pollution of a water body and the bottom mud. The thalia dealbata is a perennial emergent aquatic plant, is fond of warmth and water dampness, resistant to partial shade, higher in biomass, relatively easy to manage, and high in viewing value after blossom, so that the thalia dealbata planted in the wetland scenic spot can exert effects of beautifying and purifying an environment; and the method is a water body environment purification method with a very high ecological value.

Description

technical field [0001] The invention belongs to environmental engineering, and relates to landscape aquatic plant purification and restoration technology for heavy metal-contaminated bottom mud, in particular to a method for firstly using aquatic plants to fix / stabilize heavy metal Pb in lake bottom mud. Background technique [0002] As heavy metal pollution in urban water environment has become a worldwide environmental problem that has attracted much attention, this kind of research has also become a hot scientific issue and technological frontier in the field of environmental science and engineering research at home and abroad. Among them, phytoremediation technology, because of its investment It has shown obvious effectiveness in the treatment of heavy metals and organic pollutants, and has become an important means of remediation of heavy metal non-point source pollution in soil and water environment. [0003] Although people have realized that phytoremediation is of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F101/20
CPCC02F11/02C02F2101/20C02F2103/007
Inventor 唐宇力钱萍范丽琨张海珍周虹
Owner 杭州西湖风景名胜区灵隐管理处
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