Linked Life Data

18172808

Source:http://linkedlifedata.com/resource/pubmed/id/18172808

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2008-1-3
pubmed:abstractText
To attain a high nitrogen removal efficiency and good sludge settleability in a step-fed sequencing batch reactor (SFSBR) treating swine wastewater, L(9)(3(4)) orthogonal experiments were carried out to optimize main factors associated with nitrogen removal, namely, the influent C/N ratio, feeding volume ratio, nitrogen loading rate and aeration intensity. Results showed that nitrogen loading rate contributed most for the build-up of NO(2)(-)-N, NO(3)(-)-N and NH(4)(+)-N in the effluent, while aeration intensity was the most important factor for net nitrogen removal efficiency based on the initial and final nitrogen concentrations in the SFSBR cycle. Additionally, the periodic starvation created by stepwise feeding was the major inducing force for granulation in the SFBSR process and the influent C/N ratio had a profound influence on sludge settleability and granular sludge stability in terms of sludge volume index (SVI) and the fraction of granular sludge with diameter over 0.5 mm (f(0.5 mm)), respectively. Considering the most and secondary important control factor for individual response index, the optimal operating condition for nitrogen removal of SFSBR treating swine wastewater was determined as A(3)B(3)C(1)D(2), i.e., influent C/N ratio 7.0 mg COD/mg NH(4)(+)-N, feeding volume ratio 3:1, nitrogen loading rate 0.026 g NH(4)(+)-N/gVSS . d and aeration intensity 4.2 L/m(3) . s, respectively. Under the optimal operating conditions, inorganic nitrogen concentration in the effluent, net nitrogen removal efficiency, SVI and f(0.5 mm) reached 21 mg/L, 72 %, 40.7 mL/g and 4.3 %, respectively.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1093-4529
pubmed:author
pubmed:issnType
Print
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
161-70
pubmed:dateRevised
2009-8-14
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Optimization of main factors associated with nitrogen removal in hybrid sludge sequencing batch reactor with step-feeding of swine wastewater.
pubmed:affiliation
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't