Abstract
Because fly ash is a specially controlled of municipal solid waste (MSW), it is treated with insolubilization, mainly chelation, to prevent leaching of Pb and other substances, before disposal in landfills. When chelated fly ash is landfilled, residual chelate and chelate-derived COD and nitrogen are eluted into the leachate. Residual chelate causes nitrification inhibition in the leachate treatment process, but chelate-derived COD and nitrogen are persistent. Moreover, they interfere with leachate treatment. Results of experimentation have confirmed that oxidation, such as using ozone, can decompose residual chelates, but decomposing chelate-derived COD and nitrogen is difficult. Given this background, after constructing an electrolysis apparatus using a piperazine chelating agent, we conducted experiments to decompose residual chelate, COD, and T-N.
