有机废水厌氧酸化和聚羟基烷酸生产组合系统的研究

SYSTEM OF ANAEROBIC ACIDIFICATION OF WASTEWATER AND PRODUCTION OF POLYHYDROXYALKANOATE

以３０ｇ／Ｌ葡萄糖合成废水为原料，研究了厌氧酸化的操作温度（θ）对酸化率的影响，确定了达到最佳酸化产物分布时的ｐＨ值，并以酸化反应器的出水为碳源，在５Ｌ发酵罐上进行了分批和流加发酵实验．结果表明，θ＝４０℃时，废水的酸化率接近１００％；控制ｐＨ５．７，停留时间１０ｈ可使丁酸占ＵＡＳＢ反应器出水中总酸质量的６８％；与分批发酵相比，流加发酵法可大幅度地提高ＰＨＡ的产量，发酵５４ｈ后，ＤＣＷ和ＰＨＡ的质量浓度可分别达到１５．８ｇ／Ｌ和１０ｇ／Ｌ．

The effect of temperature on the degree of acidification and that of pH on the organic acids distribution in the effluent of UASB were investigated. The batch and fed batch fermentations were carried out in a 5 L fermentor with acidified wastewater as carbon source. The results showed that the degree of acidification was almost 100% when temperature was 40℃. When pH was controlled at 5.7, butyric acid accounted for 68% of the total acids in the effluent of UASB. PHA production could be improved greatly in fed-batch fermentation compared with that in batch fermentation, DCW and PHA reached 15.8 g/L and 10 g/L, respectively after 54 h.