Maliheh Falah Nezhad, Naser Mehrdadi and Ali Torabian
Keywords: Effluent quality index, reuse, topsis, quality parameters, sub-index
Abstract: Water scarcity is considered as one of the most critical issue in Iran. Managing the domestic effluent for industrial, agricultural and recreational reuses can compensate the water shortage. Effluent Quality Index (EQI), is an efficient tool for rapidly evaluation of the quality achieved by different treatment systems for reuse purposes. The index is developed by a weighted average of eight parameters (TSS, BOD5, COD, NH4, PO4, FECAL COLIFORM, TDS, and PH) which obtained from Delphi method and Fuzzy Topsis decision making tools. Calculation of water quality rating curves (subindices) were based on giving a rating scores of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 corresponding to the 5th , 10th , 20th , 30th, 40th , 50th , 60th, 70th, 80th , 90th, and 99 percentiles respectively to each parameter observations. Then, the thresholds for different reuses and discharges are defined by using environmental limitations and developed EQI. Finally, the effluent quality of South Waste Water Treatment plant of Tehran for summer and autumn is evaluated using the developed EQI.
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