不同碳源对低温好氧活性污泥系统微生物菌群和制浆中段废水COD去除效果的影响

Effect of Different Carbon Source on Aerobic Activated Sludge under Low Temperature

研究了在低温条件下,以葡萄糖、醋酸钠以及不同比例的葡萄糖和制浆中段废水混合液作为碳源对好氧活性污泥系统的影响。分别采用不同碳源对好氧活性污泥驯化30d,结果表明,以醋酸钠作为碳源时,COD去除率最高,达81.2%;其次是葡萄糖、葡萄糖和中段废水的混合比例为6∶1的混合液,COD去除率分别为78.9%、69.3%,最差的是葡萄糖与中段废水比例为2.5∶1时的混合液,COD去除率为43%左右。以醋酸钠为碳源时,污泥的沉降性能和絮凝性能最好。采用全自动微生物鉴定系统对不同碳源下的主要优势菌进行鉴定,结果表明碳源为葡萄糖及葡萄糖和中段废水的混合比例为6∶1的混合液时,好氧活性污泥中主要优势菌为恶臭假单胞菌,碳源为醋酸钠时主要优势菌为斯太格尔沃特军团菌,碳源为葡萄糖与中段废水比例为2.5∶1时的混合液时主要优势菌为产酸克雷伯菌GC子群。

Effect of different carbon source, including glucose, sodium acetate, the mixed hquor of alnerent ratio of glucose and mid - stage pulping effluent on aerobic activated sludge was studied under low temperature. The results showed that after the aerobic sludge was domesticated for 30d, COD removal rate achieved the highest value of 81. 2% as sodium acetate being the carbon source, and 78.9% , 69.3% and 43% were achieved by glucose, the 6： 1 mixed liquor of glucose and mid - stage pulping effluent and the 2.5 ： 1 mixed liquor of glucose and mid - stage pulping effluent. The settling and flocculating performances were the best when sodium acetate was as the carbon source. The dominant bacteria were identified by full - automatic microbial identification systems, the results showed that the dominant bacteria were Pseudomonas putida biotype when the carbon source was as glucose and the 6 ： 1 mixed liquor of glucose and mid - stage pulping effluent, Legionella steigerwaltii and Klebsiella oxytoca GC subgroup were the dominant bacteria as sodium acetate and 2.5 ： 1 mixed liquor of glucose and mid - stage pulping ef- fluent being the carbon source, respectively.