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Titolo:
EFFECTS OF INTERMITTENT-CYCLE EXTENDED-AERATION TREATMENT ON THE FATEOF NUTRIENTS, METALS AND BACTERIAL INDICATORS IN PIG SLURRY
Autore:
BICUDO JR; SVOBODA IF;
Indirizzi:
LAB NACL ENGN CIVIL,AV BRASIL 101 P-1799 LISBON PORTUGAL SCOTTISH AGR COLL,DEPT BIOCHEM SCI AUCHINCRUIVE KA6 5HW AYR SCOTLAND
Titolo Testata:
Bioresource technology
fascicolo: 1, volume: 54, anno: 1995,
pagine: 63 - 72
SICI:
0960-8524(1995)54:1<63:EOIETO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
AEROBIC TREATMENT; PROBABLE NUMBER; WASTE-WATER; REMOVAL; DENITRIFICATION; NITRIFICATION; NITROGEN; ENUMERATION; PHOSPHORUS; REACTORS;
Keywords:
SLURRY TREATMENT; ACTIVATED-SLUDGE; NUTRIENT REMOVAL; INTERMITTENT AERATION; BACTERIAL INDICATORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
J.R. Bicudo e I.F. Svoboda, "EFFECTS OF INTERMITTENT-CYCLE EXTENDED-AERATION TREATMENT ON THE FATEOF NUTRIENTS, METALS AND BACTERIAL INDICATORS IN PIG SLURRY", Bioresource technology, 54(1), 1995, pp. 63-72

Abstract

A farm-scale activated sludge treatment plant for separated pig slurry was operated with four different aeration cycles during a year with the objective of optimising the process and producing an effluent withlow nutrient and pathogen concentrations. The high TC nitrogen-removals observed (over 95%) appeared to be FC related to the denitrification achieved through the intermittent operation of the aerator. It was necessary to supply, on. average, about 120 kWh/day (i.e. 10 kWh/pig) in order to obtain a treated effluent with mean concentrations of 31.6 mg N-NH4/l and 77.6 mg NO3- N/l The removal of phosphorus was more variable. Percentage removals ranged from 20 to 90%. Concentrations between 25 and 60 mg PO4-P/l were obtained in the treated effluent. From the experimental data and available observations it could not be concluded whether the removal mechanism for P was predominantly chemical or biological. Mean percentage removals of metals were about 90% for Cu and 85% for Zn. Although the TS value of raw slurry indicated a large dilution of slurry (dilution factor of about 4), the initial bacterial concentrations were relatively high. About 2-3 logarithmic units reductions were observed but concentrations of the order of 10(6) faecal coliform and 10(7) faecal streptococci were still found in the final effluent.

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Documento generato il 19/09/20 alle ore 15:23:48