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Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture
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 NO3−-N and/or PO43− 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 NO3−-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% PO43− under high DO conditions in 12 days. Abiotic and biochemical removal of NO3−-N and abiotic removal of PO43− were higher under independent NO3−-N/PO43− loading, while 99% PO43− was removed biochemically under combined NO3−-N and PO43− 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.
Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture
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 NO3−-N and/or PO43− 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 NO3−-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% PO43− under high DO conditions in 12 days. Abiotic and biochemical removal of NO3−-N and abiotic removal of PO43− were higher under independent NO3−-N/PO43− loading, while 99% PO43− was removed biochemically under combined NO3−-N and PO43− 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.
Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture
Front. Environ. Sci. Eng.
Narayanasamydamodaran, Sanjena (author) / Zuo, Jian’e (author) / Ren, Haiteng (author) / Kumar, Nawnit (author)
2021-08-01
Article (Journal)
Electronic Resource
English
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