Treatment of wool scouring effluent
Lapsirikul, W. and Ho, G.E. (1991) Treatment of wool scouring effluent. In: Workshop on Appropriate Technology for Environmentally Sustainable Development / conducted for ASEAN delegates by Remote Area Developments Group, 2 July, Perth, Australia pp. 29-33.
Effluent from the wool scouring industry is considered to be the most strongly polluting waste in the whole textile industry (Anderson & Wood, 1973). It typically contains 3,000 to 21,000 mg/l wool grease, 7,000 to 15,000 mg/l suint salts (salt produced by natural excretions) and 10,000 to 30,000 mg/l dirt (sand, vegetable matter and fibre). The biological oxygen demand (BOD) and chemical oxygen demand (COD) of the effluent can be as high as 40,000 mg/l and 120,000 mg/l respectively (Anderson & Wood, 1973; Cail et al., 1986; Christoe & Bateup, 1987; Genon et al., 1986).
Since wool grease can be recovered as a saleable by product (lanolin) a majority of scouring plants around the world use disc centrifuges to recover this valuable product (Chris toe & Bateup, 1987). However, only the best quality of grease (approximately 25 to 45% of the total) is removed. The concentration of grease as well as other pollutants in the final discharge is still too high for their disposal to be considered environmentally acceptable. For this reason, further treatment is required.
|Publication Type:||Conference Paper|
|Murdoch Affiliation:||School of Environmental Science|
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