Method for removing residual cadmium in farmland
A technology for farmland and cadmium pollution, applied in the restoration of polluted soil, etc., can solve problems such as insufficient continuity of technology research and development, and achieve the effect of promoting absorption
Active Publication Date: 2019-11-29
JIANGSU GEOLOGICAL SURVEY INST
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Problems solved by technology
[0007] (1) Partial indoor simulation, few special studies on cadmium pollution in farmland soil;
[0008] (2) The continuity of technology research and development is not enough, and there are few complete test results from indoor to field;
[0009] (3) As far as cadmium and other polluted farmland is concerned, there are almost no examples of successful field trials of planting plants;
[0011] Including Jiangsu, many grain-producing regions in my country urgently lack practical remediation technologies to prevent and control heavy metal pollution such as cadmium
Method used
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Embodiment 1
[0045] The method of planting Suliu 795+weeping willow 1011 to remove soil Cd
[0046] According to a 2-year cycle, transplant Suliu 795 and Golden Weeping Willow 1011 willow cuttings at equal intervals. The basic method steps are as follows:
[0047] (1) Plowing the land. Use special machinery to plow the field to be repaired, and the plowing depth of the soil layer is about 30cm. After ploughing, it was exposed to the wind and the sun for 3 days, and the harmless herbicide commonly used in the local area was evenly sprayed once.
[0048] (2) Seedling preparation. During the land plowing period, seedlings can be prepared at the same time (it can be solved by purchasing or preparing by yourself), and enough Su Liu 795 and Golden Weeping Willow 1011 cuttings can be prepared according to the land area to be repaired, for planting after land consolidation is completed. Each cutting is 15cm long and about 1cm in diameter at the lower end.
[0049] (3) Field improvement. Level...
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The invention provides a method for absorbing and removing residual cadmium in farmland by means of the large-biomass plant, namely a willow, belonging to the technical field of remediation and treatment for cadmium pollution of agricultural land soil. The method comprises the following steps: 1) ploughing, crushing and leveling cadmium-polluted farmland; (2) planting willow cuttings into the cadmium-polluted farmland in an insertion manner, wherein the willow cuttings are originated from Salix jiangsuensis 795 and Salix X aureo-pendula 1011, and performing interplanting; 3) supplementing water within 30 days after the willow cuttings are planted in the insertion manner, and completing weeding, thinning, seedling supplementing and soil loosening within 60 days; 4) loosening the soil of survived willows from the time when the willows grow to 50 cm high; (5) removing the willows after the willows grow for 600-700 days; and 6) repeating the operations in the step (1) to the step (5) onceto twice. The method of the invention can rapidly and efficiently reduce the residual cadmium pollution in the farmland to the utilization level of safe production of rice and the like.
Description
technical field [0001] The invention belongs to the technical field of cadmium pollution restoration and treatment of agricultural land soil, and in particular relates to a method for removing residual cadmium in agricultural land. Background technique [0002] Cadmium pollution in farmland not only threatens the safety of food production, but also directly relates to human health and even the future of the nation. The prevention and control of cadmium pollution in farmland or farmland soil is becoming a topic of great concern to people all over the country. Treatment of cadmium pollution in farmland soil requires mature remediation technology. Soil cadmium-polluted phytoremediation technology is currently a once-and-for-all method that can fundamentally remove residual cadmium in soil. It is ecological, sustainable, and green, and is the most acceptable to the world. , and of course the most challenging. The research on phytoremediation technology for soil contaminated by ...
Claims
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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 廖启林朱锦旗郝社锋任静华许伟伟范健刘玲崔晓丹葛礼强
Owner JIANGSU GEOLOGICAL SURVEY INST