Device for in-situ remediation of cadmium and lead contaminated farmland soil through sulfate reduction system driven by microorganism electrochemistry and method thereof

A microbial electrochemical and in-situ remediation technology, which is 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: 2020-04-24
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 for in-situ remediation of cadmium and lead contaminated farmland soil through sulfate reduction system driven by microorganism electrochemistry and method thereof
  • Device for in-situ remediation of cadmium and lead contaminated farmland soil through sulfate reduction system driven by microorganism electrochemistry and method thereof
  • Device for in-situ remediation of cadmium and lead contaminated farmland soil through sulfate reduction system driven by microorganism electrochemistry and method thereof

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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 for in-situ remediation of cadmium and lead contaminated farmland soil by microbial electrochemical enhanced sulfate reduction and a method thereof. According to the method, a sulfate reduction reactor is used for generating the sulfur-containing (S<2->) water system passivator, the passivator can be used for in-situ remediation of cadmium and lead polluted farmland soil, and cadmium and lead are converted into forms which are difficult to absorb by crops. A double-chamber sulfate reduction reactor is constructed, current is applied to promote hydrogen production reaction of a cathode chamber, and autotrophic sulfate reducing bacteria in the cathode chamber can reduce sulfate into S <2-> by utilizing hydrogen and an inorganic carbon source generated by water electrolysis of an electrode. After the passivator containing S<2-> is mixed with soil, the toxicity of cadmium and lead in farmland soil can be reduced. The liquid passivator is used for restoringthe cadmium and lead polluted farmland soil, the physicochemical property of the soil cannot be obviously changed, and the device and the method have obvious advantages compared with the mode of restoring the heavy metal polluted soil through quick lime, 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 Applications(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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