Tiwari Manoj K, Guha Saumyen, Harendranath C S, Tripathi Shweta
Department of Civil Engineering, Indian Institute of Technology, Kanpur 208016, India.
Water Res. 2005 Oct;39(16):3801-10. doi: 10.1016/j.watres.2005.07.004.
Effect of natural ionic polymer additives on granulation in lab-scale UASB reactors treating low-strength synthetic wastewater (COD 750-850 mg/L) was examined. The organic loading rate was 1.477+/-0.118 kgCOD/m3/day. Under identical conditions four similar reactors were operated in parallel with the following additives: control with no additive, anionic part of Reetha (Sapindus trifoliata) extract, cationic part of Reetha extract, and Chitosan. By the end of the study period, Chitosan as an additive produced largest granules with mean size of 0.15 mm closely followed by the cationic fraction of the Reetha extract with mean size of 0.144 mm, and anionic fractions of the Reetha extract with 0.139 mm. Control reactor with no additives had the smallest size granules with mean size of 0.128 mm. The fraction of granules in the sludge bed of size >0.1 mm showed similar trend. The largest granule size observed in the reactors with additives was 4-5mm as compared to 2 mm in the control reactor. Cationic polymers were more effective additives for enhancing sludge granulation. Exo-cellular protein, lipid, sugar and total polymer increased with granulation in the reactors. A COD removal efficiency of 95-98% was achieved in all the reactors.
研究了天然离子聚合物添加剂对实验室规模的上流式厌氧污泥床（UASB）反应器处理低强度合成废水（化学需氧量750 - 850毫克/升）时颗粒化的影响。有机负荷率为1.477±0.118千克化学需氧量/立方米/天。在相同条件下，四个类似的反应器并行运行，分别添加以下添加剂：不添加添加剂的对照组、皂荚（无患子）提取物的阴离子部分、皂荚提取物的阳离子部分和壳聚糖。在研究期结束时，添加壳聚糖的反应器产生的颗粒最大，平均粒径为0.15毫米，其次是皂荚提取物的阳离子部分，平均粒径为0.144毫米，皂荚提取物的阴离子部分平均粒径为0.139毫米。不添加添加剂的对照反应器中颗粒尺寸最小，平均粒径为0.128毫米。污泥床中粒径大于0.1毫米的颗粒所占比例呈现类似趋势。添加添加剂的反应器中观察到的最大颗粒尺寸为4 - 5毫米，而对照反应器中为2毫米。阳离子聚合物是增强污泥颗粒化更有效的添加剂。随着反应器中颗粒化程度的提高，细胞外蛋白质、脂质、糖和总聚合物含量增加。所有反应器的化学需氧量去除效率均达到95 - 98%。
Zotero 插件