Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Improvements on activated sludge settling and flocculation using biomass-based fly ash as activator.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-10-10 , DOI: 10.1038/s41598-019-50879-6 Xiaoqian Chen 1, 2, 3 , Fangong Kong 1 , Yingjuan Fu 1 , Chuanling Si 2 , Pedram Fatehi 3
Scientific Reports ( IF 3.8 ) Pub Date : 2019-10-10 , DOI: 10.1038/s41598-019-50879-6 Xiaoqian Chen 1, 2, 3 , Fangong Kong 1 , Yingjuan Fu 1 , Chuanling Si 2 , Pedram Fatehi 3
Affiliation
|
Biomass-based fly ash and wastewater are undesired products of the pulping industry. Recently, the use of biomass-based fly ash as an adsorbent (i.e., a valued material) for constituents of wastewater effluents was reported. In this work, the settling performance and properties of activated sludge were studied in the presence of fly ash. Upon mixing, fly ash increased the zeta potential of the sludge from -31 mV to -28 mV, which was due to the release of cationic ions from fly ash in the sludge suspension. The sludge settling and its flocculation affinity were improved through the complexation of flocs and released cation ions from fly ash. The relationships between the protein/polysaccharide (PN/PS) ratio and the content of extracellular polymeric substances (EPS) as well as the ratio and the properties of the sludge flocs were determined. A correlation between the total loosely bound-EPS (LB-EPS) content and the effluent suspended solids (ESS) (Pearson's coefficient, rp = 0.83) was observed. The performance of sludge flocculation and settling were much more closely correlated with LB-EPS than with tightly bound EPS (TB-EPS). Scanning electron microscopy (SEM) analysis of sludge flocs before and after EPS extraction showed that the sludge flocs contained a large number of microorganisms, mainly Bacillus and Cocci. The amount of LB-EPS had an adverse influence on bioflocculation, effluent clarification and sludge settling affinity. The sludge properties had a moderate relationship with the PN/PS ratio of LB-EPS. Also, no correlation could be established between the ratio and the TB-EPS content.
中文翻译：
使用基于生物质的粉煤灰作为活化剂，改善了活性污泥的沉降和絮凝。
生物质粉煤灰和废水是制浆工业中不希望的产品。近来，已经报道了使用基于生物质的粉煤灰作为废水流出物的成分的吸附剂（即有价值的材料）。在这项工作中，研究了在有粉煤灰存在下活性污泥的沉降性能和性质。混合后，粉煤灰将污泥的ζ电势从-31 mV增加到-28 mV，这是由于污泥悬浮液中的粉煤灰释放了阳离子。污泥的沉降及其絮凝亲和力通过絮凝物和粉煤灰释放的阳离子的络合得到改善。确定了蛋白质/多糖（PN / PS）比率与细胞外聚合物质（EPS）的含量以及污泥絮凝物的比率和性质之间的关系。观察到总的松散结合EPS（LB-EPS）含量与污水中悬浮固体（ESS）之间的相关性（皮尔森系数，rp = 0.83）。污泥的絮凝和沉降性能与LB-EPS的关系远比与紧密结合的EPS（TB-EPS）的关系密切。EPS提取前后污泥絮凝物的扫描电子显微镜（SEM）分析表明，污泥絮凝物含有大量的微生物，主要是芽孢杆菌和球菌。LB-EPS的量对生物絮凝，废水净化和污泥沉降亲和力有不利影响。污泥性质与LB-EPS的PN / PS比具有适度的关系。同样，在比例和TB-EPS含量之间也没有建立相关性。
更新日期：2019-10-10
中文翻译：
使用基于生物质的粉煤灰作为活化剂，改善了活性污泥的沉降和絮凝。
生物质粉煤灰和废水是制浆工业中不希望的产品。近来，已经报道了使用基于生物质的粉煤灰作为废水流出物的成分的吸附剂（即有价值的材料）。在这项工作中，研究了在有粉煤灰存在下活性污泥的沉降性能和性质。混合后，粉煤灰将污泥的ζ电势从-31 mV增加到-28 mV，这是由于污泥悬浮液中的粉煤灰释放了阳离子。污泥的沉降及其絮凝亲和力通过絮凝物和粉煤灰释放的阳离子的络合得到改善。确定了蛋白质/多糖（PN / PS）比率与细胞外聚合物质（EPS）的含量以及污泥絮凝物的比率和性质之间的关系。观察到总的松散结合EPS（LB-EPS）含量与污水中悬浮固体（ESS）之间的相关性（皮尔森系数，rp = 0.83）。污泥的絮凝和沉降性能与LB-EPS的关系远比与紧密结合的EPS（TB-EPS）的关系密切。EPS提取前后污泥絮凝物的扫描电子显微镜（SEM）分析表明，污泥絮凝物含有大量的微生物，主要是芽孢杆菌和球菌。LB-EPS的量对生物絮凝，废水净化和污泥沉降亲和力有不利影响。污泥性质与LB-EPS的PN / PS比具有适度的关系。同样，在比例和TB-EPS含量之间也没有建立相关性。
京公网安备 11010802027423号