Abstract
The filtration characteristics of untreated sewage sludge, thermal alkaline pretreated and anaerobic fermented sewage sludge were investigated in the process of fatty acids production. The filtration resistance, viscosity, particle size, extracellular polymeric substances (EPS) and soluble microbial products (SMP) were determined to identify the filtration characteristics of the sewage sludge. The results indicated that thermal alkaline pretreatment significantly increased the filtration resistance and viscosity of the sewage sludge, while anaerobic fermentation decreased the filtration resistance. The particle size of the sewage sludge decreased after pretreatment and fermentation. Moreover, the EPS concentration in the sludge sharply decreased after thermal alkaline pretreatment and then increased after the following fermentation. The mechanism of the increase of sludge filtration resistance after pretreatment could be attributed to the release of EPS from the microbial cells of the sludge. The degradation and conversion of SMP into volatile fatty acids could explain the decrease in the filtration resistance after fermentation.
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