化学
生物利用度
磷
磷酸盐
过氧化氢
环境化学
无机化学
强化生物除磷
铁
胞外聚合物
核化学
污水处理
活性污泥
废物管理
有机化学
生物信息学
遗传学
生物膜
细菌
工程类
生物
作者
Chunzhi Gong,Wei Lin,Peinong Chen,Peter Desmond,Xu He,Huu Hao Ngo,Anwei Ding
标识
DOI:10.1016/j.jwpe.2024.104986
摘要
Sludge serves as an alternative to traditional sources of phosphorus. However, the low phosphorus bioavailability limits its utilization. In this study, different oxidation treatments based on permanganate-ferric chloride (Mn(VII)-Fe(III)) catalysis were employed to improve the phosphorus bioavailability of sludge. The phosphorus bioavailability was evaluated using sequential extraction. Comparative experiments showed that the group of Mn(VII)-Fe(III)/peroxydisulfate (PDS) was more effective than Mn(VII)-Fe(III)/sodium percarbonate (SPC) and Mn(VII)-Fe(III)/hydrogen peroxide (H2O2) in increasing the phosphorus bioavailability of sludge. The extracellular polymeric substances (EPS) of sludge were disintegrated under the oxidative treatment through destructing the bonds of CH and OH, leading to the release of phosphorus. Meanwhile, the bond of O=P=O was broken down, which caused the degradation of organic phosphorus into inorganic phosphorus. This process reduced the amount of residual phosphorus and insoluble phosphorus in sludge, as well as increased the amount of phosphates. Some of the phosphate was deposited in sludge solid phase due to the adsorption of MnOx and FeOx. Phosphates combined with added and released Fe ions to form FeP complex enhanced the phosphorus bioavailability. The stronger destruction on O=P=O and higher disintegration on EPS promoted the achievement of better enhancement of phosphorus bioavailability under Mn(VII)-Fe(III)/PDS treatment. Furthermore, three types of oxidation treatments based on Mn(VII)-Fe(III) have all been shown to improve heavy metals leaching and reduce sludge dewaterability. Therefore, oxidation methods based on Mn(VII)-Fe(III) have excellent effects on the resourcefulness, harmlessness and minimization of sludge. This work provides ideas for selecting more practical sludge conditioning methods in engineering.
科研通智能强力驱动
Strongly Powered by AbleSci AI