Volume No. 9 Issue No.: 3A Page No.: 813-821 January-March 2015




M. Chethana, Sorokhaibam Laxmi Gayatri, Bhandari Vinay M.*, Ranade Vivek V.1 and S. Raja 2

1. Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Pune (INDIA) 2. Department of Biotechnology Manipal Institute of Technology, Manipal, Karnataka (INDIA)


Received on : October 25, 2014




A new biocoagulant and coagulation behaviour of Acanthocereus tetragonus (Triangle cactus) has been studied for removal of congo red dye. Effect of various parameters such as initial dye concentration (50-500 ppm), pH of the solution (3-8), coagulant dose etc. has been investigated in detail. The use of bio coagulant is highly effective in removal of dye and in reducing colour. The extent of dye removal is practically unaffected by dye concentration as against conventional inorganic coagulants and a maximum dye removal of 96.7% has been observed. The optimum dose for coagulant was in the range 600-1200 ppm. Up to 93% colour removal could be achieved using this new biocoagulant. Similar to chemical coagulants, coagulation is pH sensitive and pH 6 was found to be most suitable for maximum coagulation effect. Though the bio-coagulant dose is relatively higher than conventional chemical coagulants, volume of sludge generated was found to be less and a sludge volume index of ~50 mL/g for 1 hour was obtained. A comparison of the coagulation performance has been made by comparing the results with those obtained using conventional chemical coagulants such as alum, ferric and aluminium based coagulants and it can be concluded that use of biocoagulant in the form of new coagulantAcanthocereus tetragonus can be promising alternative for effecting coagulation in dye wastewater treatment


Keywords : Acanthocereus tetragonus, Biocoagulant, Coagulation, Dye wastewater, Effluent