Development And Utilization Of Aerobic Granules For Treating Low Strength Domestic Wastewater

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dc.contributor.authorPeyong, Yet Nee
dc.date.accessioned2018-07-11T07:14:12Z
dc.date.available2018-07-11T07:14:12Z
dc.date.issued2012-03
dc.description.abstractAerobic granules were developed using low strength wastewater in sequencing batch reactor (SBR). The changes in microbial morphologies and structures of aerobic granules under different organic loading rates (OLR) and their tolerance towards free ammonia (FA) and free nitrous acid (FNA) were studied. The development of aerobic granules was carried out in 3 stages. In the first stage, aerobic granules were cultivated using low strength synthetic domestic wastewater with OLR of 1.2 kg/m3day. Stable aerobic granules were formed after 60 days operation with an average granule size of 2.2 mm. The mixed liquor suspended solid (MLSS) concentration of aerobic granules was 1.2 g/L with the sludge volume index (SVI) value of 78 mL/g and minimal settling velocity of 22.5 m/h. Subsequently, in the second stage, low strength real domestic wastewater with OLR of 0.13 kg/m3day was fed to the reactor. After 14 days operation, a mixture of compacted aerobic granules and small debris resulted from the breakage of granules was observed. Biomass concentration and settle ability were reduced to 0.17 g/L and 165 mL/g, respectively. In the third stage, external carbon source was added to the domestic wastewater in order to increase the OLR by 0.6 kg/m3day. Under this new condition, more aerobic granules with excellent settle ability were formed with an average size of 2.0 mm, SVI of 88 mL/g and maximum settling velocity of 110 m/h. Microscopic images showed that different microbial morphologies and structures were found in aerobic granules at the three different stages. The inhibitory studies of FA on the activity of aerobic granules reveals that FA at a concentration up to 36.9 mg NH3-N/L did not inhibit the specific oxygen uptake rate (SOUR) of aerobic granules. However, FNA started to inhibit the SOUR at 0.015 mg HNO2-N/L and completely stopped the oxygen consumption at around 0.134 mg/L HNO2-N/L. FNA inhibition of aerobic granules was found to be reversible.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5905
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectAerobic granules were developed usingen_US
dc.subjectlow strength wastewater in sequencing batch reactoren_US
dc.titleDevelopment And Utilization Of Aerobic Granules For Treating Low Strength Domestic Wastewateren_US
dc.typeThesisen_US
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