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Titolo:
Biological lamella sedimentation used for wastewater treatment
Autore:
Lekang, OI; Bomo, AM; Svendsen, I;
Indirizzi:
Norwegian Univ Agr, Dept Agr Engn, N-1430 As Nlh, Norway Norwegian Univ Agr As Nlh Norway N-1430 Agr Engn, N-1430 As Nlh, Norway
Titolo Testata:
AQUACULTURAL ENGINEERING
fascicolo: 2, volume: 24, anno: 2001,
pagine: 115 - 127
SICI:
0144-8609(200102)24:2<115:BLSUFW>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-TREATMENT; RAINBOW-TROUT; PARTICLE; AQUACULTURE; EFFLUENT; SYSTEMS; REMOVAL; GROWTH;
Keywords:
wastewater treatment; sedimentation; water sampling; sludge production;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Lekang, OI Norwegian Univ Agr, Dept Agr Engn, POB 5065, N-1430 As Nlh, Norway Norwegian Univ Agr POB 5065 As Nlh Norway N-1430 s Nlh, Norway
Citazione:
O.I. Lekang et al., "Biological lamella sedimentation used for wastewater treatment", AQUACULT EN, 24(2), 2001, pp. 115-127

Abstract

Sedimentation basins represent a low-cost system for wastewater treatment,but they need large areas and do not remove all small particles. A new sedimentation principle known as biological lamella sedimentation, has therefore been evaluated. The process involves establishing a biofilm on bioblocks, which are placed in the sedimentation basin, and the film should improve the removal of suspended solids because it attaches small particles. A laboratory model of the sedimentation system was connected to the outlet of a small fiberglass fish tank (0.5 m(3)), which contained 123 rainbow trout with a mean weight of 206 g. The 22 days study measured inlet and outlet watervalues of the sedimentation basin, the feed used, fish growth and collected sludge. The results showed that it was very difficult to obtain representative water samples from the outlets of the fish tank and the sedimentationbasin. There were wide variations between the replicates for several of the parameters analysed. However, mass budget estimates, i.e. measurements offeed used, fish growth, and collected sludge, gave reasonable values. Thismethod was preferable to water sample analysis. The mass budget estimates showed reasonably good removal rates for TP (43.2%) and TN (7.3%). A total of 98.3 g (TDM) was collected per kg fish produced. The average TDM, TP andTN in the collected sludge were 2.15, 5.17 and 2.14%;, respectively. Thereis a potential for making technical improvements to the design of the biological lamella sedimentation basin as was evaluated. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 13:27:02