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Titolo:
INFLUENCE OF THE ADDITION OF DIFFERENT METALS TO AN ACTIVATED-SLUDGE SYSTEM ON THE ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL
Autore:
ROSKE I; SCHONBORN C; BAUER HD;
Indirizzi:
DRESDEN UNIV TECHNOL,DEPT NAT SCI,MICROBIOL LAB,MOMMSENSTR 13 D-01062DRESDEN GERMANY INST SOLID STATE & MAT RES DRESDEN D-01069 DRESDEN GERMANY
Titolo Testata:
Internationale Revue der gesamten Hydrobiologie
fascicolo: 4, volume: 80, anno: 1995,
pagine: 605 - 621
SICI:
0020-9309(1995)80:4<605:IOTAOD>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPPORTING PHOSPHATE REMOVAL; RELEASE;
Keywords:
WASTE WATER; BIOLOGICAL PHOSPHORUS ELIMINATION; ADDITION OF PRECIPITANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
I. Roske et al., "INFLUENCE OF THE ADDITION OF DIFFERENT METALS TO AN ACTIVATED-SLUDGE SYSTEM ON THE ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL", Internationale Revue der gesamten Hydrobiologie, 80(4), 1995, pp. 605-621

Abstract

Activated sludge systems can be operated to select bacteria which accumulate phosphorus as polyphosphate. By these means, phosphate can be removed without the addition of chemical precipitants. This contribution presents results of experiments with a bench-scale purification plant for domestic sewage. The goal was to find the concentrations of relevant metal cations at which the biological P removal may be affected by competing chemical (precipitation) or physical (adsorption) processes. For this goal, increasing amounts of iron and calcium, respectively, were added into the pilot plant. During the addition of iron, the proportion of chemically (iron-) bound phosphorus increased from 10 to more than 50 %. The P-release rare substantially decreased with increasing amount of added iron. An addition of small amounts of iron enhanced the long-term stability of the P elimination as a whole. During theexperimental period with addition of calcium, the proportion of Ca-bound phosphorus increased from 1 to 2 % to almost 15 %. In batch experiments a measurable Ca-phosphate precipitation took place at a pH valueof at least 8.0 and a Ca-concentration of at least 100 mg/l. The increase in hardness of the influent waste water didn't produce any positive effect on the stability of the enhanced biological phosphorus removal. The metal ions Ca2+, Mg2+ and K+ serve as counter-ions in the polyphosphate chains. They were identified and quantified by X-ray spectrometry in combination with scanning transmission electron microscopy. Arelease of Mg2+ and K+ occured simultaneously with the degration of polyphosphates (PP). The PP bound to Ca was not redox sensitive.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 11:46:09