Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture  

作　　者：Sanjena Narayanasamydamodaran Jian’e Zuo Haiteng Ren Nawnit Kumar 

机构地区：[1]State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing,100084,China [2]State Key Laboratory of Hydroscience and Hydraulic Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第4期215-228,共14页环境科学与工程前沿（英文）

基　　金：We are grateful for the project grants supported by the Major Science and Technology Programs for Water Pollution Control and Management of China(Nos.2012ZX07205-001 and 2017ZX7103-007).

摘　　要：This study focuses on identifying the factors under which mixed microbial seeds assist bio-chemical denitrification when Scrap Iron Filings(SIF)are used as electron donors and adsorbents in low C/N ratio waters.Batch studies were conducted in abiotic and biotic reactors containing fresh and aged SIF under different dissolved oxygen concentrations with NO_(3)^(-)−N and/or PO_(4)^(3−)influent(s)and their nitrate/phosphate removal and by-product formations were studied.Batch reactors were seeded with a homogenized mixed microbial inoculum procured from natural sludges which were enriched over 6 months under denitrifying conditions in the presence of SIF.Results indicated that when influent containing 40 mg/L of NO_(3)^(-)−N was treated with 5 g SIF,79.9%nitrate reduction was observed in 8 days abiotically and 100%removal was accomplished in 20 days when the reactor was seeded.Both abiotic and seeded reactors removed more than 92%PO_(4)^(3−)under high DO conditions in 12 days.Abiotic and biochemical removal of NO_(3)^(-)−N and abiotic removal of PO_(4)^(3−)were higher under independent NO_(3)^(-)−N/PO_(4)^(3−)loading,while 99%PO_(4)^(3−)was removed biochemically under combined NO_(3)^(-)−N and PO_(4)^(3−)loading.This study furthers the understandings of nitrate and phosphate removal in Zero Valent Iron(ZVI)assisted mixed microbial systems to encourage the application of SIF-supported bio-chemical processes in the simultaneous removals of these pollutants.

关 键 词：Scrap iron filing Nitrate removal Phosphate removal Mixed culture denitrification Zero valent iron 

分 类 号：X52[环境科学与工程—环境工程]