DECOLOURIZATION OF TEXTILE MILL WASTEWATER USING CHEMICAL SLUDGE

Abstract

Textile wastes are frequently treated by biological treatment processes such as aerated lagoon and activated sludge process. These processes are effective in the reduc-tion of BOD and SS but not suitable for colour removal. Some dyes are toxic to some organism and may cause the destruction of acclUatic creature'. Coagulants like aluin lime and ferric salts have been proved to be expensive. In addition, they give rise to problems. due to the production of large volume of sludges (4). Adsorbents like:silica, wood, peat, Fuller's earthhair& also been tried with satis-factory results (6). Activated carbon gives very high efficiency of dye uptake but owing to its high manufacturin and regeneration cost, it has little field applicability. .The object of ensuing study is an'extension of work reported by Mehrotra anciManjunath (6):1-egnin sludge obtained from pulp and paper mill waste-water was used as sorbent fdr the-reactive dye; Problem Brill Blue H-70.. An attempt has been made to explore the possibility of using pulp and paper mill slUdge without draining it on sand bed prior to drying in oven. ExperiMents were conducted 'by varying the following factors: initial dye concentration 50mg/1,100mg/1 and 150Mg/1. (ii) sludge dose - 150 ppm, 300ppm; 600ppm and 900ppm., (iii) sludge particle size range 7- less then 75 micron, 75-150micron and 177-350 micron