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- W84205619 abstract "In the process of gelatine manufacture, bovine hide is soaked for several months in lime pits. The pit effluents are high in pH, COD and calcium content and constitute a major source of pollution. Because of the associated municipal levies for effluent discharge, there are prospects for the installation of an economic, on-site treatment facility. Two process configurations were evaluated for treatment of the above effluent, namely anaerobic treatment and combined anaerobicaerobic treatment. In the latter treated water was used to dilute the raw water by 58%. Calcium carbonate which precipitated during treatment, served as a medium on which bacterial growth could occur in the primary anaerobic stage. Ceramic Raschig rings were used as immobilisation medium in the aerobic biofilter and activated carbon in the secondary anaerobic stages. Insoluble organic and solubilised and complex organic molecules were biodegraded to simpler molecules through hydrolytic reactions in the primary anaerobic stage. The produced molecules were further fermented to short-chain volatile acids, resulting in the pH of the water being reduced from 12,0 to 8,1, the COD reduced from 20 500 to 17 500 mg/l land calcium reduced from 5 210 to 1 680 mg/l (as CaCO3) as a result of calcium carbonate crystallisation. Except for the initial period of the experiment (first 50 days) no methane production was achieved in the anaerobic reactor as a result of high concentrations of sulphide (1 200 mg/l (as S)), ammonia (1 800 mg/l (as N)) and propionic acid (1 000 mg/Q, and a pH of 7,9. In the aerobic and secondary anaerobic stage, organic acids were biodegraded to CO2, resulting in a further COD reduction to 6 000 mg/l and calcium reduction to 230 mg/l (as CaCO3). This study demonstrated that the effluent can effectively be neutralised via biological treatment, resulting in a 95% removal of the effluent calcium and a 74% reduction of the COD value." @default.
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- W84205619 date "1990-01-01" @default.
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- W84205619 title "Treatment of gelatine factory effluent" @default.
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