Device and method for in-situ remediation of cadmium and lead polluted farmland soil by microbial electrochemically driven sulfate reduction system

An in-situ remediation and sulfate technology, applied in the field of lead-contaminated farmland soil, sulfate reduction system in-situ remediation of cadmium, to achieve the effect of reducing production costs and the output of pollutants such as sludge

Active Publication Date: 2021-04-16
ZHEJIANG UNIV
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Problems solved by technology

The current discharge of industrial wastewater, wastewater irrigation and the use of phosphate fertilizers lead to the accumulation of cadmium and lead in farmland soil, which can easily enter the food chain by absorbing crops, thus creating potential human health risks

Method used

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  • Device and method for in-situ remediation of cadmium and lead polluted farmland soil by microbial electrochemically driven sulfate reduction system
  • Device and method for in-situ remediation of cadmium and lead polluted farmland soil by microbial electrochemically driven sulfate reduction system
  • Device and method for in-situ remediation of cadmium and lead polluted farmland soil by microbial electrochemically driven sulfate reduction system

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Embodiment 1

[0034] Remediation of cadmium and lead compound polluted farmland soil from Shangyu, Zhejiang. Bacterial culture solution includes sodium bicarbonate 1g / L, sodium sulfate 0.3g / L, potassium chloride 0.07g / L, potassium dihydrogen phosphate 0.1g / L, ammonium chloride 0.9g / L, vitamin 5ml / L, minerals 10ml / L. The hydraulic retention time of the cathode chamber of the sulfate reduction reactor was 20 hours. The current is controlled at 20mA. Soil remediation time is 21.5 hours. After the soil was replaced, the next repair was carried out, and a total of ten batches of soil were repaired.

[0035] For the actual experimental setup, see figure 2 .

[0036] Under the condition of 20mA current, the sulfate reduction reactor will convert 60mg / L of S-SO 4 2- Solution reduced to 30mg / L S-S 2- solution, remaining 30mg / L of S-SO 4 2- solution. The conversion rate was 50%.

[0037] The average curing efficiency of bioavailable cadmium was 48.98% (±9.36%), and the average curing eff...

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Abstract

The invention discloses a device and method for in-situ restoration of cadmium and lead polluted farmland soil by microbial electrochemically enhanced sulfate reduction. The present invention utilizes sulfate reduction reactor to produce sulfur-containing (S 2‑ ) Water-based passivation agent, which can repair cadmium and lead-contaminated farmland soil in situ, and convert cadmium and lead into forms that are difficult to be absorbed by crops. By constructing a double-chamber sulfate reduction reactor, the application of electric current promotes the hydrogen production reaction in the cathode chamber, and the autotrophic sulfate-reducing bacteria in the cathode chamber can use the hydrogen generated by the electrode electrolysis of water and the inorganic carbon source to reduce sulfate. for S 2‑ . The containing S 2‑ The passivator mixed with soil can reduce the toxicity of cadmium and lead in farmland soil. The invention uses the liquid passivating agent to remediate the cadmium- and lead-contaminated farmland soil without causing obvious changes in the physical and chemical properties of the soil, and has obvious advantages compared with the remediation of the heavy metal-contaminated soil by using quicklime, biochar and the like.

Description

technical field [0001] The invention belongs to the technical field of in-situ remediation of cadmium and lead-contaminated farmland soil, and specifically relates to a device and method for in-situ remediation of cadmium and lead-contaminated farmland soil by a microbial electrochemically driven sulfate reduction system, wherein the microorganisms are sulfate-reducing bacteria . Background technique [0002] With the development of industrialization and urbanization, heavy metal soil pollution has become a major environmental problem threatening global food security and human health. According to the National Soil Pollution Survey and Research Bulletin on the National Soil Pollution Status, 16.2% of China's soil is polluted by heavy metals or metalloids. Cadmium (Cd) and lead (Pb) pollution in China has become the focus of public attention. Cadmium and lead pollution account for a large proportion of agricultural soil pollution. Current industrial wastewater discharge, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/085B09C1/10B09C2101/00
Inventor 李中坚杨帆唐先进雷乐成杨彬翟伟伟
Owner ZHEJIANG UNIV
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