聚乙烯醇(PVA)厌氧生物降解特性试验研究

对聚乙烯醇 (PVA)的生物降解特性进行试验研究。结果表明 :厌氧颗粒污泥的微生物组成及粒径大小 ,对PVA的降解率影响最大 ,以产酸菌为主的颗粒污泥对PVA的降解能力最强 ,2 0d后PVA的降解率高达 70 % ,以甲烷菌为主的颗粒污泥对PVA的降解能力最差 ,2 0d后PVA的降解率仅为 6 3% ;pH对PVA的降解率影响不大 ,碱度过大对PVA的降解不利 ;PVA共基质试验结果表明 :以葡萄糖为碳源时 ,低浓度的葡萄糖会改变污泥的表面性质 ,使PVA迅速吸附到污泥表面 ,但随着降解时间的延长 ,PVA的浓度会回升 ,高浓度的葡萄糖对PVA的降解产生抑制 ;以淀粉为碳源时 ,产酸菌优先利用淀粉 ,PVA的降解率没有明显提高。在PVA浓度低时 ,在底物中添加一定的氮源可以提高PVA的降解率

Pilot study on characteristics of anaerobic biodegradation of PVA

The biological characteristics of PVA were studied. The results showed that the microorganism and diameter of granular sludge directly influence PVA removal efficiency. When granular sludge including acidogenic bacterium decomposed PVA, PVA removal efficiency achieved 70% in 20 d.Otherwise, when granular sludge including methanogenics bacterium decomposed PVA, PVA removal efficiency achieved 6.3% in 20 d. pH hardly influenced removal efficiency of PVA, high alkaline was unfavorable for anaerobic treatment of PVA. Co-degradation test result indicated: When glucose regarded as carbon source, the characteristics of sludge surface changed, sludge surface adsorbed amount of PVA, but concentration of PVA raised along with time, high glucose concentration led to low PVA removal. When starch regarded as carbon source, PVA removal efficiency was low. Increased nitrogen source was advantageous of PVA decomposing under low concentration PVA condition.