WWT in dairy industrypossibility of reusemillipore废水回用工业应用案例.pdfVIP

Desalination 195 (2006) 141–152 Wastewater treatment in dairy industries — possibility of reuse Baisali Sarkar, P.P. Chakrabarti, A. Vijaykumar, Vijay Kale* Lipid Science and Technology Division, Indian Institute of Chemical Technology, Hyderabad 500007, India Tel. +91 (40) 2719-3370; Fax +91 (40) 2719-3370; email: vijay_kale1@ Received 30 June 2005; accepted 7 November 2005 Abstract The reuse of wastewater from the dairy industry was investigated using coagulation, adsorption and membrane separation. Dairy industry was chosen as it requires huge volume of water. In recent times, development of newer membranes with high flux/rejection characteristics have increased the probability of water reuse and recycling up to a greater extent. In this investigation thorough pretreatment studies were done using different types of coagulants categorized as inorganic, polymeric, and organic having biological origins. The coagulant treatment was performed at various pH using different dosages and it was followed by activated charcoal treatment. The combined effects of these two pretreatment methodologies were evaluated. The color and the odor were removed completely and permanently after charcoal treatment. The pretreated water was passed through a cross flow reverse osmosis membrane system and the permeate water was found to have very good quality. This was compared to the process water used by the dairy farm and was found that the water can be recycled or reused. Keywords : Dairy wastewater; Coagulants; Powdered activated charcoal (PAC); TDS; COD; Membrane processes 1. Introduction organizations to protect the environment. This has made the water treatment more e