Journal
BIORESOURCE TECHNOLOGY
Volume 247, Issue -, Pages 477-485Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.09.078
Keywords
Swine wastewater; Anaerobic; SBR; Nitrogen removal; Iron scraps
Funding
- China Agriculture Research System [CARS-36-10B]
- National Key Technology R D Program [2016YFD0501403]
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This study presents a novel strategy for remedying acidification and improving the removal efficiency of pollutants from digested effluent by using Zero-Valent Iron (iron scraps) in a sequencing batch reactor. Through this strategy, the pH increased from 5.7 (mixed liquid in the reactor without added ZVI) to 7.8 (reactors with added ZVI) because of Fe-0 oxidation and NO3- reduction. The removal efficiencies of COD increased from 11.5% to 77.5% because of oxidation of ferric ion and (OH)-O-center dot produced in chemical reactions of ZVI with oxygen and because of flocculation of iron ions. The removal efficiencies of total nitrogen rose from 1.83% to 93.3% probably because of autotrophic denitrification using electron donors produced by the corrosion of iron, as well as the favorable conditions for anammox due to iron ions. Total phosphorus increased from -25.8% to 77.1% because of the increase in pH and the precipitation with iron ions.
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