Soil smoldering remediation method for heavy metal co-contaminated soil
A remediation method and composite pollution technology, applied in the field of remediation of heavy metal polluted soil, can solve the problems of height, need to be as thin as two centimeters or less, inconvenient to operate, limited in effect, etc., and achieve soil fertility improvement and cation exchange. The effect of enhanced capacity and enhanced water retention capacity
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Embodiment 1
[0030] Example 1 After treatment with the technology of the present invention, the DTPA effective state leaching effect of contaminated soil before and after fumigation (Table 1)
[0031] (1) Binding of rice straw and pretreatment of contaminated soil;
[0032] The rice straws with a moisture content of about 5% are bound into straw bundles with a uniform size and a length of about 30cm.
[0033] 20cm of soil on the surface of farmland polluted by complex heavy metals near a lead-zinc mine in Lechang, Guangdong, was sun-dried until the soil had a water content of 10%.
[0034] (2) The soil to be treated is covered with rice straw
[0035] Prepare the soil treated in (1) and the bound rice straws respectively. The mulching method in which the rice straw and the soil layer are overlapped and stacked in a circular shape. First put a certain amount of bound rice straws on the bottom, then cover a layer of larger clods on top of the rice straws, put a certain...
Embodiment 2
[0042] Before and after the soil was treated with the technology of the present invention, Tessier (Tessier et al., 1979) five-stage continuous extraction method was used to carry out multi-stage extraction experiments. Tessier five-stage extraction is sequentially from the effective state to the carbonate binding state to the iron and manganese oxidation state to the organic state to the residue state. The test results show that the chemical forms of heavy metals in the soil treated with the technology of the present invention have changed significantly compared with those before treatment, three relatively unstable metals: exchangeable state, carbonate binding state and iron and manganese oxidation state The percentage of the sum of the forms in all five-level forms is reduced, such as lead Pb ( figure 1 ), zinc Zn ( figure 2 ), copper Cu ( image 3 ), Cadmium Cd ( Figure 4 ) decreased from 59.75%, 64.13%, 16.50% and 64.16% before treatment to 48.67%, 56.42%, 2.25% and ...
Embodiment 3
[0043] Example 3 Field experiment in Lechang, Guangdong, measuring the biomass (Table 2) and heavy metal content (Table 3) of the aerial parts of vegetables harvested in the field
[0044] From May to August 2012, in the farmland near a lead-zinc mine in Lechang, Guangdong, a random block method was used to set up 6 blocks and 48 small sample squares of 2m × 2m, with a total area of about 300 square meters. . In each block group, 24 small sample squares of fumigated soil were randomly determined by drawing lots. The 24 sample squares were treated with the technology of the present invention and compared with the other 24 small sample squares without fumigation, and then four small sample squares were planted. Plant local vegetables that can be grown all year round, namely southern sweet bamboo mustard, four-season cabbage, bantam cabbage and cabbage.
[0045] During the growth period of the four kinds of vegetables, NPK compound fertilizer was regularly applied twice, a...
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