A kind of curing agent and curing method thereof
A technology of curing agent and peat, applied in the field of environmental engineering, can solve the problems of unfavorable As fixation, easy leaching of Pb, no treatment method, etc., and achieve the effect of enhancing soil fertility level, low cost and strong metal adsorption capacity
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Embodiment 1
[0036] 1) Weigh 30% of fly ash, 35% of lime, and 35% of peat. The peat is calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then fully pulverized and mixed with a ball mill to obtain a curing agent;
[0037] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;
[0038] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.
[0039] After testing, the leaching concentration of Pb dropped from 34.1 mg / L before curing to 3.8 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 21.2 mg / L before curing to 2.0 mg / L...
Embodiment 2
[0041] 1) Weigh 40% fly ash, 40% lime, and 20% peat. The peat is calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then pulverized and mixed with a ball mill to obtain a curing agent;
[0042] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;
[0043] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.
[0044] After testing, the leaching concentration of Pb dropped from 34.8 mg / L before curing to 3.3 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 21.5 mg / L before curing to 2.1 mg / L after curing. ...
Embodiment 3
[0046] 1) Weigh 30% by weight of fly ash, 51% of lime, and 19% of peat. The peat is first calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then fully pulverized and mixed by a ball mill to obtain a curing agent;
[0047] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;
[0048] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.
[0049] After testing, the leaching concentration of Pb dropped from 33.6 mg / L before curing to 2.5 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 22.3 mg / L before curi...
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