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Organic content as COD of the mixed sludge is about 20.000mg/l, which is
considered to be high-strength wastewater. Due to the sludge have high water
content, it cannot self-burn. In addition, in many industries, there is not enough
land for landfill. For this reason, an experiment of anaerobic treatment was
conducted to investigate the degradation of organic materials in the mixed
sludge. The result shows that high degradation efficiency of organic sludge of 90, 70 and 50% was achieved at organic loading rate of 0,7; 1,4 and 2,1 g/l/d
respectively. The degradation efficiency decreased drastically when the organic
loading rate increased up to 2.8 g/l/d. During the experiment, gas evolution rate
was low due to low organic content of the sludge.
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