Nitrogen Removal from Dye-Industry Wastewater using Pile Fabrics as Biomass Carriers

概要

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Wastewater from the dye industry contains high level of organic nitrogen derived fromurea. Thus, an effective nitrogen removal process is needed to reduce effluent nitrogenconcentration. We have developed a new nitrogen removal process using non-wovenbiomass carriers. In this study, we used pile fabrics, which are products of the localindustry in the Wakayama prefecture, instead of non-woven materials as biomass carriersto improve nitrification rates. Several pile fabrics were then used for nitrification andcontinuous nitrification/denitrification experiments. The specific NOx-N production rateusing an acrylic pile fabric was 3.4 times higher than that of non-woven carriers. About75% nitrification efficiencies were obtained under a T-N loading rate of 0.5 kg-N/m3/dayand a HRT of 10 hours during continuous nitrification using acrylic pile fabrics.Furthermore, continuous nitrification/denitrification experiments were carried out usingacrylic pile fabrics in a base cloth with a mesh structure to improve the diffusion rates.Little biomass accumulated on the pile fabric surfaces so a high diffusion rate through thepile was maintained for long periods. Denitrification efficiencies of 56 and 77 % wereachieved at HRTs of 12 and 19 hours, respectively, with influent concentrations of 200 mg/lT-N and 450 mg/lTOC.
2010-06-15