Untitled

A lthough the textile plant effluent was treated b y a biological treatment process, the quality was n ot sufficient to reuse it on site. The membrane process (RO and NF) was successfully used to obtain a permeate quality which allowed water r euse in the dyeing process, but this process r equired a physicochemical pretreatment. The using of a mixed ferric chloride-cationic polymer solution could achieve a very low DOC and absorbance values which reduced the fouling problem. Under these conditions, the best results w ere obtained with 84 mg.L -~ Fe and 2 mg.L -j PE. Moreover, the higher flow rate, 90 L h- 1 m 2 at 18.5 bar, was obtained with NF; the percent p roduction rate was 22.6% for NF and 18.3% for RO. At this pressure, the permeate quality of NF and RO was sufficient even if the minerar values o f the permeate from RO are lower than NF. H owever, the permeate quality (low DOC concentration, absorbance and weak mineralization) a llowed successful recycling in the dyeing process project. This work needs to be studied further. Another sampling test should be done due to the variation o f effluent quality. Moreover, retentate treatment s hould be considered. In fact, since the filtration s tep was only a mass transport, the chemical o xidation process should be studied as a retentate t reatment from the membrane process.