Method for remediation of lead pollution on beach soil
A lead-contaminated, soil technology, applied in the field of remediation of heavy metal-contaminated soil, can solve the problems of high energy consumption and cost, and achieve the effect of reducing cost and energy consumption
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Embodiment 1
[0030] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 10 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 5 days. Adjust the soaking water depth to 20cm, continue soaking for 20 days, and then drain. After restoration, the average lead content in the 0-20cm topsoil was 64.4 mg / kg, and the removal rate of lead was 16.3%.
Embodiment 2
[0032] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 30 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 10 days. Adjust the soaking water depth to 20cm, continue soaking for 30 days, and then drain. After restoration, the average lead content in the 0-20cm topsoil was 55.7 mg / kg, and the removal rate of lead was 27.7%.
Embodiment 3
[0034] The remediation soil is mudflat soil in the Pearl River Estuary. The average lead content in the 0-20cm topsoil was 77 mg / kg. The purpose of restoration is to reduce the average lead content of surface soil as much as possible. Combined with the tidal flat reclamation project, the tidal flat has been reclamated to isolate the tidal flat soil from seawater. The soil of reclamation beach should be sun-dried and crushed for 10 days after being drained at low tide, and then soaked in seawater intermittently, with a maximum water depth of 5cm. After each soaking, the soaking water has completely leaked and then put into seawater. The soaking treatment time 5 days. Adjust the soaking water depth to 20cm, continue soaking for 20 days, and then drain. Repeat the above process once. After restoration, the average lead content in the 0-20cm topsoil was 52.7 mg / kg, and the removal rate of lead was 31.5%.
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