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A technology for remediating soil and grasses, applied in the field of pollution control, can solve problems such as remediation that have not been reported, and achieve the effects of low cost and obvious effect.
Active Publication Date: 2012-09-12
YUNNAN CHIHONG ZINC & GERMANIUM
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[0016] There are many methods of using phytoremediation of heavy metal-contaminated soil, but there is no
Method used
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Embodiment 1
[0024] Tested on 1 hectare of heavily polluted soil, the pollution depth is 30cm, the contents of lead, zinc, copper, cadmium and arsenic are 15010, 34740, 340, 188 and 338 mg / kg respectively, and the soil pH value is 6.2. Cover the contaminated soil to a depth of 0.5m, level the surface soil, and water to keep the relative humidity of the soil at 60%. Transplant Carex cloud mist, transplanting cluster distance, 50cm. Harvest once in March and September respectively, and leave underground roots to grow again. A total of 6 tons of dry weight of Sex sativa harvested, of which the content of lead, zinc, copper, cadmium and arsenic reached 5562, 10090, 80 and 74 respectively. , 100 mg / kg. After 5 years of planting and harvesting, the contents of lead, zinc, copper, cadmium, and arsenic in the soil were reduced to 70, 90, 44, 0.25, and 20 mg / kg respectively, which reached the second level of the soil environmental quality standard GB15618-1995 Require.
Embodiment 2
[0026] Sow 20g of sedge seeds on bonsai lightly polluted soil of 1×1×1m. The lead, zinc, copper, cadmium and arsenic in the bonsai soil are 217, 500, 58, 2.7 and 30mg / kg respectively, and the soil pH The value is 6.5, and the relative humidity of the soil is 70% by watering. Harvest the aboveground part of Carex sativa when it grows to more than 60 cm. The dry weight of Carex sativa is 0.6 kg, and the content of lead, zinc, copper, cadmium, and arsenic is 841.5, 1845, 171, 11.5, and 90 mg / kg. Lead, zinc, copper, cadmium, and arsenic in the soil are reduced to 30, 90, 20, 0.15, and 10 mg / kg, meeting the requirements of the first-level standard of the soil environmental quality standard GB15618-1995.
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Abstract
The invention belongs to the technical field of pollution treatments, and discloses a method for restoring soil with carex nubigena. An earthing depth of the soil polluted by lead, zinc, copper, cadmium and arsenic is 0-1m, the surface soil is flattened, and a relative humidity of the soil reaches above 50 percent by watering; and a PH value of the soil is adjusted to 5.0-7.5 by adding acidic materials to the soil. The carex nubigena is transplanted, and a cluster distance of transplanting is 20-100cm; and/or seeds of the carex nubigena are sown, and a sowing density is 5-30g/m<2>; and the carex nubigena is reaped once every half a year, and/or the carex nubigena is reaped when the height is larger than 60cm, underground roots are remained after reaping so that the carex nubigena grows again, and the reaped plants are centralized and treated including being burned by a fuming furnace. According to the method, the overground part of the carex nubigena is reaped, and lead, zinc, copper, cadmium and arsenic in soil are removed, so as to achieve the purpose of restoring soil.
Description
technical field [0001] The invention relates to a method for repairing soil by absorbing lead, zinc, copper, cadmium and arsenic in the soil by Carex sativa, belonging to the technical field of pollution control. Background technique [0002] With the continuous development of mining and industrial production, the quality of the global environment is deteriorating, and the problem of soil heavy metal pollution has become the focus of attention all over the world. Since 2009, more than 30 major heavy metal pollution incidents have occurred in China. According to reports, the area of China's polluted cultivated land reaches 20 million hectares, accounting for about 1 / 5 of the total cultivated land area, of which heavy metal pollution accounts for about 30% to 40% of the polluted area. China's annual grain output due to soil pollution is as high as 10 million tons, and the direct economic loss is more than 10 billion yuan. [0003] There are two main ways to control soil he...
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