Goldwyn P Livingston Peter, Saseetharan M K, Jayanthi J
VLB Janakiammal Polytechnic College, Coimbatore - 641 042, India.
J Environ Sci Eng. 2010 Jul;52(3):205-12.
Filamentous bulking is one of the major problems in activated sludge operation that hinders the settling of sludge. Filamentous bulking occurs only when the filamentous bacteria grow in larger amount as compared to the floc forming bacteria. There are several short-term and long-term methods for controlling the filamentous bulking and addition of chlorine is one of the short-term methods to control the filamentous growth, which is considered to be the universal success. Batch settling tests were conducted with the dairy waste in a batch reactor and settling studies were carried out before and after chlorination by varying initial MLSS from 2 g/L to 8 g/L with a MCRT of 5 days. Zone settling velocity was found to increase appreciably. The microbial growth was observed and the filamentous bacteria were identified as Sphaerotilus natans and Nostocoida limicola. It is found out that the nutrient deficiency was the main cause for the filamentous growth and settling velocity improved on the addition of chlorine. There has been a considerable decrease in the sludge volume index after chlorination.
丝状膨胀是活性污泥运行中的主要问题之一，它会阻碍污泥的沉降。只有当丝状细菌比絮凝形成细菌生长得更多时，才会发生丝状膨胀。有几种短期和长期控制丝状膨胀的方法，添加氯是控制丝状生长的短期方法之一，这被认为是普遍有效的。在间歇式反应器中对乳品废水进行了间歇沉降试验，并通过将初始混合液悬浮固体（MLSS）从2 g/L变化到8 g/L，平均细胞停留时间（MCRT）为5天，在氯化前后进行了沉降研究。发现区域沉降速度明显增加。观察了微生物生长情况，并鉴定出丝状细菌为浮游球衣菌和泥生颤藻。研究发现营养缺乏是丝状生长的主要原因，添加氯后沉降速度得到改善。氯化后污泥体积指数有相当大的下降。
