Effect of chelating of extracellular polymeric substances and nickel on hydrolysis and acidogenesis of food waste
Low bioavailability of trace elements is key factor to affect anaerobic fermentation performance.The effect of chelator of extracellular polymeric substances(EPS)and Ni on the hydrolysis and acidogenesis process of food wastes was studied in this paper.Firstly,the optimum and suboptimum concentration of external Ni was obtained as 2.5 mg·L-1 and 1.25 mg·L-1 when only Ni was supplemented in the anaerobic fermentation system.Secondly,five types of chelating agents were added with complex of Ni with the ratio of 1:1 with the condition of suboptimum concentration of Ni(1.25 mg·L-1),then the acidogenesis efficiency was obtained with comparable with the condition of suboptimum concentration of Ni.And the acidogenesis efficiency with EPS as chelating agent was 16.6％and 5.7％higher than the condition with suboptimum and optimum concentration.Finally,the highest bioavailability and more abundance of acidogenic bacteria were found as the important reason to enhance the anaerobic fermentation process of FW when EPS was acted chelating agent with Ni.
nickelbioavailabilityextracellular polymeric substancesfood wastehydrolysis and acidogenesis
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