Dehydrated sludge with two concentrations of total suspended solids (high: 50 g/L TSS; low: 20 g/L TSS) were studied for 20 d to investigate the effects of anaerobic fermentation on sludge properties. The results showed that the soluble chemical oxygen demand (SCOD) of high-concentration sludge was 16.53 g/L, much higher than that from the low one. The SCOD/total nitrogen ratio of high-concentration sludge varied from 8 to 14.29 g/g, indicating that the sludge could serve as a carbon source for biological denitrification. High-concentration sludge showed a short-chain fatty acid yield of 11.29 g COD/L, much higher than that from low-concentration sludge. The specific resistance of the sludge to filtration (SRF) increased with fermentation time. The quantity of low-speed centrifugation substances (LSCS) was the main factor that influenced the reduction of dehydration. The correlation coefficient between the SRF and protein content in the LSCS layer was significantly positive.
Research Article|June 01 2013
The effects of anaerobic fermentation on dehydrated sludge
Haowen Lu, Ruihua Dai, Yan Liu, Anan Song, Xiang Liu; The effects of anaerobic fermentation on dehydrated sludge. Water Sci Technol 1 June 2013; 67 (11): 2630–2636. doi: https://doi.org/10.2166/wst.2013.189
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