Method for jointly remedying polychlorinated biphenyls contaminated soil through microorganisms and mineral substances
A polychlorinated biphenyl and contaminated soil technology, applied in the field of contaminated soil treatment, can solve the problems of high environmental requirements, wide application limitations, high operating costs, etc., and achieve strong environmental friendliness, high repair efficiency, and improved desorption rate Effect
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Embodiment 1
[0034] A method for jointly treating polychlorinated biphenyl-contaminated soil with microorganisms and minerals, comprising the steps of:
[0035] 1) Select 0-30cm of the PCB-contaminated soil as the repair layer, fully plow the soil in the repair layer, and discard the impurities in the soil;
[0036] 2) Take out the biological agent and activate it at 28°C for 6 hours; then spread the biological agent evenly at an amount of 20kg biological agent / mu, plow, mix evenly, water until saturated, and biologically treat for 3 days.
[0037] The biological agent is prepared from five kinds of bacteria including Rhodopseudomonas palustris, Citrobacter freundii, Shewanella, Pseudomonas putida and Bacillus pumilus;
[0038] Specifically, the biological preparation is prepared according to the following steps:
[0039] 1) Add corn steep liquor 8g, glucose 6g, dipotassium hydrogen phosphate 0.2g, potassium dihydrogen phosphate 0.2g, sodium chloride 0.1g, calcium chloride 0.1g, ferrous s...
Embodiment 2
[0045] A method for jointly treating polychlorinated biphenyl-contaminated soil with microorganisms and minerals, comprising the steps of:
[0046] 1) Select 0-30cm of the PCB-contaminated soil as the repair layer, fully plow the soil in the repair layer, and discard the impurities in the soil;
[0047] 2) Take out the biological agent and activate it at 30°C for 6 hours; then spread the biological agent evenly at an amount of 20kg biological agent / mu, plow, mix evenly, water until saturated, and biologically treat for 4 days.
[0048] The biological agent is prepared from five kinds of bacteria including Rhodopseudomonas palustris, Citrobacter freundii, Shewanella, Pseudomonas putida and Bacillus pumilus;
[0049] Specifically, the biological preparation is prepared according to the following steps:
[0050] 1) Add corn steep liquor 8g, glucose 6g, dipotassium hydrogen phosphate 0.2g, potassium dihydrogen phosphate 0.2g, sodium chloride 0.1g, calcium chloride 0.1g, ferrous s...
Embodiment 3
[0056] The effect of treatment time and biological agent application rate on PCB removal efficiency:
[0057] 1. The present invention sets the treatment time to be 24h, 48h, 72h, 96h and 120h respectively, selects the contaminated soil with PCB content of 50mg / kg as the sample, and the rest of the operating procedures are the same as in Example 2. Detect the removal rate of polychlorinated biphenyls, the results are as follows figure 1 As shown, the removal rate is about 52.1% in 24h, 80.3% in 48h, 96.5% in 72h, and more than 99% after 96h.
[0058] 2. In the present invention, the application rates of biological agents are respectively 5kg / mu, 10 kg / mu, 20 kg / mu, 40 kg / mu and 80kg / mu, and the contaminated soil with PCB content of 50mg / kg is selected as the sample , and all the other operating procedures are the same as in Example 2. Detect the removal rate of polychlorinated biphenyls, the results are as follows figure 2 As shown, when the application rate of biological ...
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