CaO_(2)联合H_(2)O_(2)原位修复污染底泥现场试验研究

In-situ Remediation of Contaminated Sediment by CaO_(2) Combined with H_(2)O_(2)

在深圳市某污染河道进行现场试验,采用CaO_(2)联合H_(2)O_(2)原位化学方法修复污染底泥,考察了该方法对底泥理化性质及污染物去除效果的影响,并进行了经济性分析。现场试验结果表明,CaO_(2)联合H2O_(2)原位修复河道污染底泥效果显著,底泥颜色迅速由黑色转为土黄色,氧化还原电位从-160 mV提高至90 mV左右;底泥中酸可挥发性硫化物去除率可达99%以上,总有机碳去除率可达24.2%左右;同时1 kg干泥中的总氮含量下降约400 mg,总磷含量无明显变化。经济性分析表明,采用CaO_(2)联合H_(2)O_(2)原位修复河道污染底泥成本约为33.4元/m^(2),比底泥疏浚方法更加经济。

The contaminated sediment from a contaminated river in Shenzhen was remedied in-situ by a chemical method of CaO_(2)combined with H_(2)O_(2).The effects of the method on the sediment physicochemical properties and pollutant removal efficiency were investigated,and the economic feasibility was analyzed.The in-situ remediation method of CaO_(2)combined with H_(2)O_(2)had a significant effect on the contaminated sediment.The color of the sediment rapidly changed from black to yellow,and the oxidation reduction potential increased from-160 mV to 90 mV.The removal efficiency of the acid volatile sulfide in the sediment was more than 99%,and that of the total organic carbon was about 24.2%.Meanwhile,the total nitrogen in 1 kg absolute dry sediment decreased by approximately 400 mg,and total phosphorous was no significant change,respectively.The economic analysis showed that the cost of the in-situ remediation of the contaminated river sediment by CaO_(2)combined with H_(2)O_(2)was approximately 33.4 yuan/m^(2) and was more economical than the dredging technology.