Conditioning of sewage sludge by Fenton's reagent combined with skeleton builders

Physical conditioners, often known as skeleton builders, are commonly used to improve the dewaterability of sewage sludge. This study evaluated a novel joint usage of Fenton’s reagent and skeleton builders, referred to as the F-S inorganic composite conditioner, focusing on their efficacies and the optimization of the major operational parameters. The results demonstrate that the F-S composite conditioner for conditioning sewage sludge is a viable alternative to conventional organic polymers, especially when ordinary Portland cement (OPC) and lime are used as the skeleton builders. Experimental investigations confirmed that Fenton reaction required sufficient time (80 min in this study) to degrade organics in the sludge. The optimal condition of this process was at pH = 5, Fe²⁺ = 40 mg g⁻¹ (dry solids), H₂O₂ = 32 mg g⁻¹, OPC = 300 mg g⁻¹ and lime = 400 mg g⁻¹, in which the specific resistance to filtration reduction efficiency of 95% was achieved.     

洗涤剂助剂的演变

回顾了三聚磷酸钠（STPP）在洗涤剂中的应用及其对水体富营养化的影响,洗涤剂助剂从三聚磷酸钠到4A分子筛,以及最新的δ－层状硅酸钠的演变过程,讨论了洗涤剂配方的发展趋势以及对环境的影响。