蒸发过程早期渗滤液中有机酸挥发规律研究

对早期填埋场渗滤液进行了常规和载气蒸发实验,通过定时分批截留冷凝液并测定其TOC和挥发性脂肪酸（volatile fatty acids, VFAs）浓度,研究了不同pH条件下早期渗滤液中有机污染物的挥发规律.结果表明,pH=4时蒸发冷凝液中TOC呈由高而低的变化趋势,pH=7时TOC变化趋势截然相反.冷凝液中VFAs（乙酸除外）浓度变化规律与TOC相似,并且结构越复杂相对挥发速率越大.分析表明,早期渗滤液蒸发冷凝液中有机物主要由VFAs组成.是否具有载气及载气量多少对早期渗滤液有机物蒸发的影响不明显.

Vaporization of Organic Acids from Young Landfill Leachate During Evaporation

To obtain the vaporization rule of organic pollutants in a young landfill leachate, we conducted normal evaporation and gas-carrying evaporation experiments, analyzing TOC and volatile fatty acids (VFAs) of batch condensate. The results showed that TOC in condensates declined when pH was 4, whereas it presented a contrary trend when pH was 7. Variation of VFAs except acetic acid in condensates was similar to that of TOC. The more complicated the chemical construction of VFAs was, the greater the relative rate of vaporization was. The results indicated that the organic matter in condensate from young landfill leachate mainly consisted of VFAs. The quantity change of carried gas didn't distinctly affect the vaporization rule of organic matter in young landfill leachate.