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Titolo:
Dissolved air flotation treatment of concentrated fish farming wastewaters
Autore:
Jokela, P; Ihalainen, E; Heinanen, J; Viitasaari, M;
Indirizzi:
Tampere Univ Technol, Inst Environm Engn & Biotechnol, FIN-33720 Tampere, Finland Tampere Univ Technol Tampere Finland FIN-33720 IN-33720 Tampere, Finland
Titolo Testata:
WATER SCIENCE AND TECHNOLOGY
fascicolo: 8, volume: 43, anno: 2001,
pagine: 115 - 121
SICI:
0273-1223(2001)43:8<115:DAFTOC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUACULTURE;
Keywords:
dissolved air flotation; DAF; fish farming; wastewater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Jokela, P Tampere Univ Technol, Inst Environm Engn & Biotechnol, Korkeakoulunkatu 4,FIN-33720 Tampere, Finland Tampere Univ Technol Korkeakoulunkatu 4 Tampere Finland FIN-33720
Citazione:
P. Jokela et al., "Dissolved air flotation treatment of concentrated fish farming wastewaters", WATER SCI T, 43(8), 2001, pp. 115-121

Abstract

Fish farming wastewaters contain nutrients, phosphorus and nitrogen, whichpromote eutrophication in the typically shallow farming sites in Finland. Fish farming wastewater treatment is problematic because of large quantities of very dilute wastewater (200 - 600 m(3)/kg fish produced). In practice wastewater treatment is concentrated on suspended solids removal. Treatmentcan be done in two steps: concentration of the very dilute wastewater and subsequent treatment of the concentrated wastewater. Dissolved air flotation pilot trials were conducted using two types of concentrated wastewaters: settled solids from a sludge hopper of a cultivation basin and swirl separator concentrate. Two different pilot plants were used and performances compared. Both mechanical treatment and precipitation by ferric salts were applied. Depending on the influent quality, 70 to 90% phosphorus reductions were achieved without chemicals. Chemical precipitation and flotation produced90% phosphorus reductions and effluent concentrations at the level of 0.05mgP/l when 13 m(3)/(m(2)h) hydraulic loading was used.

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Documento generato il 25/11/20 alle ore 18:53:56