垃圾渗滤液膜滤浓缩液的电化学氧化处理研究

Advanced treatment of concentrated leachate from membrane filtration using electrochemical process

垃圾渗滤液的膜滤浓缩液盐度高,腐殖质含量大,制约着其进一步的处理处置。借助于电化学在高盐度废水中的氧化能力,对膜滤浓缩液的电解条件和电解机制进行研究,发现在电压10V、pH=6、极板间距2cm的最佳电解条件下,COD、TN、TP质量浓度可分别从4 160、280.2、8.1mg/L下降到1 279、84.6、1.9mg/L,去除率分别为69.3%、69.8%、76.5%。此时膜滤浓缩液中的大分子物质被降解为小分子物质,而类胡敏酸物质分解为低腐殖化、低缩合度有机物,出水BOD5/COD从0.054升高到0.106,提高了96.3%,为后续处理奠定了基础。

Concentrated leachate from membrane filtration is a troublesome problem for the landfill management due to its high salt and humus content. Electrochemical process （EC） might be a promising way for the disposal of concentrated leaehate because of its high oxidation capacity in high salt wastewater. In this paper, the optimum EC condition for concentrated leachate disposal was investigated, and the electrolytic mechanism was analyzed. It was found that 69.3 % ,69.8%,,76.5% of COD,TN,TP was removed under the optimum conditions of electrolysis voltage 10 V,pH 6 and plate distance 2 cm. The initial concentration of COD,TN,TP was decreased from 4 160,280.2,8.1 mg/L to 1 279,84.6,1.9 mg/L respectively. The molecular weight distribution revealed that large molecular sub- stances were degraded into small ones. Three-dimensional fluorescence spectra indicated that some humic acid-like substances were degradation to low humificated ones with low degree of condensation. The BODs/COD value of the concentrated leachate increased from 0.054 to 0.106 after treated by EC, which would contribute to the following treat- ment process.