Enrichment of less hydrophilic sludge
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 MAT...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/39628 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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