title: Performance of a zero valent iron-based anaerobic system in swine wastewater treatment.
abstract: In this paper, short-term exposure experiments with different ZVI concentrations were conducted to research the effects of ZVI adding on the anaerobic system for treating swine wastewater. Increasing the ZVI dose had a stimulatory effect on COD removal and CH4 production possibly due to a higher corrosion-induced H2 and dissolved ferrous ions, which could stimulate the methanogenesis and thus the biodegradation. In addition, the abiotic corrosion reactions such as flocculation, adsorption and precipitation were inevitable to removal some suspended COD. However, high ZVI doses had a potential risk on microorganism due to the present of large numbers of solid iron species in sludge, which likely encapsulated the cells and even damaged the cellular structure. Taken as a whole, the most enhancing effect induced by ZVI was observed at the rZVI/VSS of 2.63, and the maximum efficiency of per ZVI adding occurred at the rZVI/VSS of 0.74. But the ZVI concentration of 50 g/L (the rZVI/VSS was 5.26) was proved too high to facilitate microorganism activity, considering the higher LDH leakage and lower intracellular ATP level than the only sludge system.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: wudl@zju.edu.cn.
authors.forename: Donglei
authors.initials: D
authors.lastname: Wu
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Shuangshuang
authors.initials: S
authors.lastname: Zheng
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Aqiang
authors.initials: A
authors.lastname: Ding
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Guodong
authors.initials: G
authors.lastname: Sun
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Meiqing
authors.initials: M
authors.lastname: Yang
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry; D000327:Adsorption; D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D055772:Green Chemistry Technology; D006859:Hydrogen / Q000737:chemistry; D007477:Ions; D007501:Iron / Q000737:chemistry*; D008697:Methane / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D019163:Reducing Agents / Q000737:chemistry; D012722:Sewage; D013552:Swine; D014865:Waste Disposal, Fluid; D062065:Wastewater; D014873:Water Pollutants / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D000255:Adenosine Triphosphate; D006859:Hydrogen; D007477:Ions; D007501:Iron; D008697:Methane; D019163:Reducing Agents; D012722:Sewage; D062065:Wastewater; D014873:Water Pollutants
keywords: Anaerobic treatment; Swine wastewater; Zero-valent iron