ゼオライト水耕法を用いた農業集落排水二次処理水中からの難分解性有機物除去

概要

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The removal of refractory dissolved organic carbon (R-DOC) in secondary treated water from a rural sewage treatment plant was studied using a hybrid-type constructed wetland system with a zeolite substratum from Jun. 2006 to Dec. 2008. Secondary treated water from a rural sewage treatment plant was supplied to this system. Average removal rates (%) of COD, DOC and E260 were 52, 43 and 22, respectively, during the experimental period by this system. R-DOC predominated in the secondary treated water and the ratio of R-DOC to total-DOC fluctuated from 53 to 84%. R-DOC was removed 38-66% after passing through the system in 2006. Result of DOM fractionation, hydrophilic acids (HiA) and hydrophobic acid (AHS) accounted for 30-40% of the total-DOM. The bases (BaS) was 19-27% and the hydrophobic neutrals ( HoN) and the hydrophilic neutrals (HiN) were present at only trace amount. The component ratio in R-DOM was similar to the total-DOM. No special removed fraction was observed in this study.
2009-12-10