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Title: Enrichment of less hydrophilic sludge
Authors: Lai, Shu Ming
Keywords: DRNTU::Engineering::Environmental engineering
Issue Date: 2010
Abstract: Hydrophilicity affects the evaporation rate of water from the sludge, and hence the diffusion flux in MDBR. The method to cultivate two sets of microbial consortia with different hydrophilicity was optimized in terms of the COD loading and extractant effectiveness of the selection methods via MATH adherence percentage and contact angle. It was found that adherence percentage and contact angle increased with number of microbial selection. In addition, Xylene was presumed to be a better extractant than hexadecane for less hydrophilic sludge. The effect of extraction on the extracellular polymeric substance (EPS) was also determined, and it was found that that the ratio of bound proteins to polysaccharide decreased with MATH selection. Furthermore, evaporation test was carried out to determine the effect of sludge hydrophilicity on vapour pressure. Different phases of evaporation process were discussed and higher evaporation rate was observed with less hydrophilic sludge.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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