Combination of Up-flow Anaerobic Sludge Blanket and Down- Flow Hanging Sponge System for Removal of Color from Reactive Dyes Wastewater
نویسندگان
چکیده
This study was carried out to assess the efficiency of a combined system consisting of up-flow anaerobic sludge blanket (UASB) reactor and down-flow hanging sponge (DHS) system for color removal from reactive dyes wastewater. The UASB reactor and DHS system were operated at HRT of 6 and 2.0 h., respectively. The results obtained indicated that, the combined system was quite effective for removal of color, COD fractions (COD total, COD soluble and COD particulate) and TSS. The total process achieved an overall removal efficiency of 78% for color, 75% for COD total, and 73% for TSS. The major part of COD in particulate form was removed in UASB reactor and little additional removal was occurred in DHS system. Unlikely, the big portion of COD in soluble form was eliminated in DHS system resulting a removal efficiency of 65% for COD soluble. This indicates that removal of particulate organics in the UASB reactor would enhance the removal of COD soluble in the DHS system. The results for DHS profile showed that the major part of color, COD and TSS was removed in the 1 st and 2 nd segment. Minor removals were occurred in the 3 rd segment of DHS system.
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