CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
Bioresour Technol. 2016 Oct;218:526-32. doi: 10.1016/j.biortech.2016.06.139. Epub 2016 Jul 5.
Efficient sludge dewatering methods are highly desired by municipal wastewater treatment plants. In this study, Fe@Fe2O3 nanomaterial, combined with polydiallyldimethylammonium chloride (PDMDAAC) and H2SO4, was used for sludge dewatering. This composite conditioner exhibited an excellent dewatering capability. By using uniform design, the optimized dosages of Fe@Fe2O3, H2SO4 and PDMDAAC were determined to be 40, 136 and 4.8mg/gDS (dry solids), respectively. The moisture content of sludge cake decreased from 78.1% to 64.8%, and the capillary suction time from 56 to 21s. The sludge extracellular polymeric substances (EPS) were decomposed, resulting in greater conversion of the bound water into free water and the release of free water. The electron spin resonance results show that the molecular oxygen activation process induced by Fe@Fe2O3 produced hydroxyl radicals, which were mainly responsible for the EPS decomposition. In this way, an efficient composite conditioner for enhancing sludge dewatering was developed.
高效的污泥脱水方法是城市污水处理厂所急需的。在本研究中，采用了 Fe@Fe2O3 纳米材料与聚二烯丙基二甲基氯化铵（PDMDAAC）和 H2SO4 结合，用于污泥脱水。该复合调理剂表现出优异的脱水能力。通过均匀设计，确定了 Fe@Fe2O3、H2SO4 和 PDMDAAC 的最佳投加量分别为 40、136 和 4.8mg/gDS（干固体）。污泥饼的含水率从 78.1%降至 64.8%，毛细吸水时间从 56s 降至 21s。污泥胞外聚合物（EPS）被分解，使结合水更多地转化为自由水并释放自由水。电子顺磁共振结果表明，Fe@Fe2O3 诱导的分子氧活化过程产生了羟基自由基，这主要负责 EPS 的分解。通过这种方式，开发出了一种用于增强污泥脱水的高效复合调理剂。
