近年來，環保署對染整廢水的放流水標準日趨嚴格，而八十七年度放流水水質標準將COD提昇至100mg/1及管制色度400單位以下，使得業者面臨新挑戰。本研究探討應用活性碳、飛灰、爐石、牡蠣殼、活性白土為吸附劑，以處理染整廠之二級放流水。研究過程，藉由改變固／液比，於反應溫度30℃之條件下，吸附去除該廢水中色度及COD。實驗結果顯示活性碳及飛灰能有效去除水中COD及色度，並符合八十七年度放流水水質標準。其他吸附劑之吸附能力則較差。基於廢棄物再利用之觀點，本研究選擇飛灰做更深入之探討。依照吸附時間及吸附劑量，COD去除率為30-95 %,色度去除率為82-98 %，而且色度去除遵循一階反應動力。單位飛灰去除COD及色度分別為12.4mg COD /g.hr.l及81.6 ADMI /g.hr.l。 The textile industry in Taiwan is confronted with the problem of color removal. As regulations are becoming ever more stringent, the need for more efficient means of color reduction trom the plant effluent grows more acute. Biological process Is a low-cost means to treat the wastewaters containing color, but it generally has a limitation in reducing the color of wastewater to a lower level. Existing physiical/chemical technologies for color removal are very efficient but are expensive and commercially unattractive. Therefore, this study was to invesigate the removal of color and COD from textlile secondary effluent using activated carbon, fly ash, oyster shell, surnace flag and activated clay as adsorbents to conform the new regulations carried out in Taiwan since 1998.Results showed that fly ash and avtivated carbon can be efficiently used to reduce the color andCOD from the textile wastewater. Other adsorbents had less efficiency in the removal of COD and color. Based on the viewpoint of waste reuse, fly ash was further studied for its adsorption capabilty .The effluent can meet the regulations of 1998 In Taiwan after treating wlth adsorption using fly ash as adsorbent. The adsorption reaction for the color removal followed the firsf-order kinetics. The ultimate percentages of COD removal were about 30-95 % and thoes of color removals in the range of 82-98%. depending on the reaction time and adsorbent dosage.The best unit removal efficiencies of COD and color for the fly ash are 12.4 mg COD/g.hr.l and 81.6 ADMI/g.hr.l, respectively.
