Transformation and migration of phosphorus in excess sludge reduction pretreatment by alkaline ferrate oxidation combined with anaerobic digestion  

作　　者：Xiang Li Yan Yuan Yong Huang Chao-ran Guo Run Jin Ting-ting Liu Jun Ma 

机构地区：[1]School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China [2]National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology,Suzhou 215009,China [3]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Journal of Environmental Sciences》2020年第6期224-234,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51938010);the Major Science and Technology Projects for Water Pollution Control and Treatment of China(No.2017ZX07205002);National Key Research and Development Programme of China(No.2016YFC0401103);the Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment。

摘　　要：Recently,more and more attention has been paid to the strong oxidation ability of newly prepared potassium ferrate(NAPF) in sludge reduction process,but less attention has been paid to the change of phosphorus in this process.The feasibility of phosphorus migration and transformation during excess sludge reduction pretre atment using NAPF pre-oxidation combined with anaerobic digestion was investigated.After 70 mg/g suspended solids NAPF pretreatment and 16 days anaerobic digestion,the solid-phase volatile suspended solids decreased by 44.2%,and much organic matter had been released into the liquid-phase and then degraded during digestion by indigenous microorganisms.As the sludge pre-oxidation process was performed,solid-phase organic phosphorus and chemically combined phosphorus also released into the liquid-phase as PO4^3-,peaking at 100 mg/L.During anaerobic digestion,the Fe3+in the liquid-phase was gradually reduced to Fe2+,and then formed Fe^2+-PO4^3- compound crystals and re-migrated to the solid-phase.The concentration of PO4^3- decreased to 17.08± 1.1 mg/L in the liquid-phase after anaerobic digestion.Finally,the phosphorus in the Fe^2+-PO4^3- compound accounts for 80% of the total phosphorus in the solid-phase.A large number of vivianite crystals in sludge were observed.Therefore,this technology not only effectively reduces sludge,but also increases the proportion of PO43-in the sludge in the form of Vivianite.

关 键 词：Excess sludge Alkaline ferrate(NAPF) PRE-OXIDATION Anaerobic digestion PHOSPHORUS Migration and transformation 

分 类 号：X703[环境科学与工程—环境工程]