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.
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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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