氯消毒对再生水可同化有机碳的影响

Influence of chlorine disinfection on the concentration of assimilable organic carbon in reclaimed water

考察了再生水氯消毒过程中的氯消耗特性及水质特性的变化,发现加氯后5 min,氯消耗速率最大,同时254 nm的紫外吸光度和三维荧光强度的变化最为显著.发现再生水消毒后生物可同化有机碳(AOC)浓度显著增加,说明消毒后水质生物稳定性变差.AOC变化趋势呈现为先增长后降低的趋势,对于不同处理工艺再生水,二级出水的AOC水平普遍高于深度处理出水,但深度出水消毒5 min后AOC的增长率却高于二级出水消毒后的增长率.进一步研究发现,再生水水样消毒后的AOC变化量与三维荧光积分值变化量之间有一定的正相关关系.

Chlorine consumption characteristics of reclaimed water and the changes in water quality characteristics during chlorine disinfection process were investigated. The consumption of chlorine was quick in the first five minutes after chlorination,meanwhile the UV absorbance and three-dimensional fluorescence spectra also changed significantly. It was found that the concentration of assimilable organic carbon（ AOC） also increased significantly after the disinfection of the reclaimed water,which indicates that the biological stability of the reclaimed water was deteriorated. AOC of recycled water samples in the disinfection process decreaded after the initial increase. The effluents of the advanced treatment processes show lower AOC levels,but higher AOC growth rate than the secondary treatment effluent water. Furthermore,it was found that the increase in AOC was correlated to the decrease in the threedimensional fluorescence integral value after chlorination.