Source:http://linkedlifedata.com/resource/pubmed/id/12906295
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
11
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pubmed:dateCreated |
2003-8-8
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pubmed:abstractText |
The effect of organic loading rate (OLR) on aerobic granulation was studied by adopting three column-shaped, sequential aerobic sludge blanket reactors (SASBR). The reactors had been fed with laboratory prepared, synthetic dextrose-nutrient broth substrate. Experimental results showed clearly that the formation, characteristics and stability of aerobic granules had a close relationship with the strength of OLR applied. Aerobic granules appeared firstly under the OLR of 4 kg COD x (m3 x day)(-1). The system stabilization was demonstrated by its little-changed amount and morphology of granules. The characteristics of the stabilized granules were: 5.4 mm in mean diameter, 1.29 in roundness, 118 mg O2 x (mg VSS x hr)(-1) in SPOUR. The respective biomass SVI was 50 mL x (g MLVSS)(-1) and the averaged COD removal rate was 95%. Under the OLR of 8 kg COD x (m3 x day)(-1), granules appeared two days later than those for 4 kg COD x (m3 x day)(-1) and they always coexisted with flocs. The formed granule bed was not as compact as that under 4 kg COD x (m3 x day)(-1). There were no granules formed under the OLR of 1 kg COD x (m3 x day)(-1). Instead, flocs with rather loose structure dominated reactor mixed-liquor. The respective SVI's were 65 and 138 mL x (g MLVSS)(-1) under OLR of 8 and 1 kg COD x (m3 x day)(-1). It was proposed that the growth and maintenance of aerobic granules follow the shear force balance theory. Under the OLR of 4 kg COD x (m3 x day)(-1), a balance was reached between the aeration shear force and organic loading rate. Under this favored condition aerobic granules formed quickly and, became stabilized with the experimental parameters remained unchanged.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:issn |
0273-1223
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
47
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
235-40
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pubmed:dateRevised |
2006-4-19
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pubmed:meshHeading |
pubmed-meshheading:12906295-Bacteria, Aerobic,
pubmed-meshheading:12906295-Biomass,
pubmed-meshheading:12906295-Bioreactors,
pubmed-meshheading:12906295-Oxygen,
pubmed-meshheading:12906295-Particle Size,
pubmed-meshheading:12906295-Sewage,
pubmed-meshheading:12906295-Waste Disposal, Fluid,
pubmed-meshheading:12906295-Water Movements,
pubmed-meshheading:12906295-Water Purification
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pubmed:year |
2003
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pubmed:articleTitle |
The effect of organic loading rate on the aerobic granulation: the development of shear force theory.
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pubmed:affiliation |
EERC, CEE, NTU, Blk N1, 50 Nanyang Avenue, Singapore 639798. p6883386h@ntu.edu.sg
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pubmed:publicationType |
Journal Article
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