Stabilization of lead in lead-contaminated soil through dilute hydrochloric acid-washed honeycomb briquette cinders
A technology for lead-contaminated soil and honeycomb coal ash, which is applied in the restoration of polluted soil and other directions, can solve the problems of reducing soil lead availability, polluted soil, soil pH and conductivity increase, etc., and achieves pH and conductivity increase and decrease, pH and conductivity lowering, effect of lowering effect
Inactive Publication Date: 2011-10-26
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0006] The object of the present invention is to provide a method for applying honeycomb ash to lead-contaminated soil after processing and reducing the effectiveness of soil lead. The ash has been washed with dilute hydrochloric acid to overcome the briquette ash in the existing method. Problems with elevated soil pH and conductivity after application
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Embodiment Construction
[0015] The method of the present invention utilizing dilute hydrochloric acid to wash honeycomb ash to stabilize the lead in the lead-contaminated soil can be described in detail with a specific example, and its concrete steps are as follows:
[0016] 1 Take a small amount of lead-contaminated soil to measure its water content, and then take soil equivalent to 400g of dried soil according to the water content.
[0017] 2 Add 1.00mL of concentrated hydrochloric acid to 99.0mL of distilled water and mix well to make dilute hydrochloric acid.
[0018] 3. Take 20g of massive ash (excluding powdery bottom ash) formed after burning briquettes, grind it finely with a wooden stick, pass all through a 2mm sieve, and mix evenly.
[0019] 4 Put 8g of sieved briquette ash and 24mL of dilute hydrochloric acid water into a plastic bottle, cover the bottle cap, and vibrate on the oscillator for 5min (180r·min -1 ), filter with medium-speed quantitative filter paper, then add 24mL of distill...
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The invention belongs to the technical field of remediation of contaminated soil and utilization of solid wastes. The invention relates to a stabilization method of lead in lead-contaminated soil and an application method of solid wastes produced by a combustion process of honeycomb briquettes, and specially relates to a stabilization method of lead in lead-contaminated soil through application of dilute hydrochloric acid-washed honeycomb briquette cinders. The stabilization method solves the technical problems that lead in lead-contaminated soil has a high effectiveness, and a PH value and aconductivity of soil can be increased if honeycomb briquette cinders are applied directly to the soil. The stabilization method of lead in lead-contaminated soil comprises the following steps of 1, grinding or crushing honeycomb briquette cinders, 2, mixing the honeycomb briquette cinders processed by the previous step and a dilute hydrochloric acid according to a ratio of weight to volume, wherein the ratio is 1: 3, 3, filtering after shocking, washing the dilute hydrochloric acid-washed honeycomb briquette cinders through distilled water for 4 times and drying them at a temperature of 80 to110 DEG C, and 4, mixing the dried hydrochloric acid-washed honeycomb briquette cinders and lead-contaminated soil according to a ratio of 1 to 50, adjusting a water content of the mixture in a range15 to 25%, and culturing the mixture for more than 60 days. Compared with the prior arts, dilute hydrochloric acid-washed honeycomb briquette cinders have a higher capability of stabilizing lead in lead-contaminated soil and a lower capability of increasing a PH value and a conductivity of soil.
Description
technical field [0001] The invention belongs to the technical field of soil heavy metal pollution remediation and solid waste utilization, and relates to a method for stabilizing lead in lead-contaminated soil and a method for utilizing honeycomb burning solid waste, in particular to using dilute hydrochloric acid to wash honeycomb ash in lead-contaminated soil to stabilize lead Methods. Background technique [0002] Heavy metals are common pollutants in soil, among which lead is one of the most common heavy metals in soil pollution. Soil heavy metal pollution can lead to food, vegetables, groundwater and air pollution, thereby affecting human and animal health. Lead-contaminated soil can also enter children's bodies through the hand-to-mouth route, affecting children's health. Compared with pollutants such as cadmium and arsenic, lead is not easily absorbed by plants. Therefore, reducing the effectiveness of lead in lead-contaminated soil through various measures is an im...
Claims
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IPC IPC(8): B09C1/00
Inventor 李立平邢维芹席欢
Owner HENAN UNIVERSITY OF TECHNOLOGY