More Tanaji T, Yan Song, Tyagi Rajeshwar Dayal, Surampalli Rao Y
Institut National de la Recherche Scientifique, Centre Eau, Terre et, Environnement, Université du Québec, 490 de la Couronne, Québec (QC), G1K 9A9, Canada.
Water Environ Res. 2015 Jun;87(6):533-46. doi: 10.2175/106143015X14212658614676.
Thirteen extracellular polymeric substances (EPS) producing bacterial strains were cultivated (as pure/mixed culture) in sterilized sludge (suspended solids: 25 g/L). The mixed culture produced higher concentrations of EPS (4.9 g/L) as compared to that of the pure culture (2.7-3.7 g/L). The harvested EPS were examined for their flocculation performance (turbidity removal and dewatering) in jar tests using kaolin suspensions with Ca2+. Broth (B-EPS) revealed high kaolin flocculating activity (91.2%) at very low concentrations (0.8 mg B-EPS/g kaolin) and it was comparable to the chemical polymer, Magnafloc-155 (90.4% at 0.2 mg/g kaolin). B-EPS also exhibited very good flocculation performance (turbidity removal %) in river water (93.5%), municipal wastewater (91.7%) and brewery wastewater (81.8%). The study revealed that the mixed culture consortium could be used for the production of highly efficient flocculants.
13株产胞外聚合物(EPS)的细菌菌株(以纯培养/混合培养方式)在灭菌污泥(悬浮固体:25 g/L)中培养。与纯培养(2.7 - 3.7 g/L)相比,混合培养产生的EPS浓度更高(4.9 g/L)。使用含Ca2+的高岭土悬浮液在烧杯试验中检测收获的EPS的絮凝性能(浊度去除和脱水)。发酵液(B - EPS)在极低浓度(0.8 mg B - EPS/g高岭土)下显示出高高岭土絮凝活性(91.2%),且与化学聚合物Magnafloc - 155相当(0.2 mg/g高岭土时为90.4%)。B - EPS在河水(93.5%)、城市污水(91.7%)和啤酒废水(81.8%)中也表现出非常好的絮凝性能(浊度去除率)。该研究表明,混合培养菌群可用于生产高效絮凝剂。