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Titolo:
Characterization of denitrifying granular sludge treating soft groundwaterin an upflow sludge-blanket reactor
Autore:
Bhatti, ZI; Sumida, K; Rouse, JD; Furukawa, K;
Indirizzi:
Kumamoto Univ, Dept Civil & Environm Engn, Kumamoto 860, Japan Kumamoto Univ Kumamoto Japan 860 il & Environm Engn, Kumamoto 860, Japan
Titolo Testata:
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
fascicolo: 4, volume: 91, anno: 2001,
pagine: 373 - 377
SICI:
1389-1723(200104)91:4<373:CODGST>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHANOLIC WASTE; DENITRIFICATION; POLYMERS; WATER;
Keywords:
upflow sludge-blanket reactor; USB; denitrification; granular sludge; loading rate; nitrate;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Furukawa, K Kumamoto Univ, Dept Civil & Environm Engn, 2-39-1 Kurokami, Kumamoto 860, Japan Kumamoto Univ 2-39-1 Kurokami Kumamoto Japan 860 o 860, Japan
Citazione:
Z.I. Bhatti et al., "Characterization of denitrifying granular sludge treating soft groundwaterin an upflow sludge-blanket reactor", J BIOSCI BI, 91(4), 2001, pp. 373-377

Abstract

Nitrate removal from soft groundwater using ethanol as a carbon source in an upflow sludge-blanket reactor containing denitrifying granular sludge was investigated. At a hydraulic retention time of 0.83 h, influent nitrate was increased stepwise from 20 to 145 mg N/l (volumetric loading rates (VLRs), 0.60 to 4.2 g N/l/d, respectively) and sludge was periodically wasted tomaintain a sludge bed of about 2/3 the liquid volume. Complete nitrate removal was achieved at influent nitrate concentrations up to 75 mg N/l(2.1g N/l/d). MLSS increased from 20 g/l at a VLR of 0.6 g N/l/d to 51 g/l at a VLR of 1.9 g N/l/d, above which it decreased. VSS increased from 11 g/l to a maximum of 25 g/l at a VLR of 2.1g N/l/d. Settling velocities showed the same trend with maximum values in a VLR range of 1.5 to 2.1 g N/Nd. However, granule size, calcium and magnesium contents of the granular sludge and protein, carbohydrate and nucleic acid contents of extracellular polymers decreased steadily with an increase in VLR throughout the range of testing. Within the VLR range of 0.6 to 2.1g N/l/d, corresponding to complete nitrate removal and efficient sludge retention, the granular sludge had a high calcium content of 24 to 22%, magnesium ranged from only 0.7 to 0.1%, proteins from 3.2 to 1.3%, carbohydrates from 4.2 to 1.4%, and nucleic acids from 0.34 to 0.05% of the sludge dry weight. These results suggest an optimum operational VLR in terms of nitrate removal and sludge retention of about 2 g N/l/d.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 01:32:10