

@mastersthesis {6790,
	title = {Stymulacja i inhibicja usuwania fosforu w procesie osadu czynnego w modelu {SBR}},
	year = {2001},
	note = {C807580},
	school = {Politechnika Wroclawska (Poland)},
	type = {phdPh.{D}.},
	address = {Ann Arbor},
	abstract = {Laboratory scale Sequencing Batch Reactors (SBR) fed with synthetic wastewater have been operated. The influence of three different factors on BPR has been investigated, namely: activated sludge solids retention time (SRT), the kind and dose of volatile fatty acids (VFA) and the kind and dose of heavy metal ions in the raw wastewater. It has been determined that the optimal SRT for BPR process was between 1.7-2.0 d. Shorter SRT effected Polyphosphate Accumulating Organisms (PAO) wash-out and thus rapid BPR deterioration. The longer SRT enabled the breed of other, non-PAO micro-organisms, resulting in PAO population dilution and sludge phosphorus content decrease. The influent doses of acetic acid and propionic acid not exceeding, respectively, 230 and 420 g/m 3 stimulated BPR process. 13-17g of CH3 OOH and 11g of C2 H5 COOH (13.9-18.2g and 16.6g COD equivalent) respectively have been used for the take-up of 1 gram of phosphorus. The higher doses of VFA have been causing gradual BPR deterioration. The influence of chlorides of lead, nickel, zinc and cadmium on BPR has been investigated (doses from 0.2 to 10.0 g/m 3 ). The degree of BPR inhibition was dependent on the kind and dose of metal ions. The ions of zinc and cadmium were the most inhibitory, causing the complete BPR inhibition at 2.0 g/m 3 . Chlorides of lead, nickel and cadmium have caused some BPR deterioration at the concentrations permitted for the discharge to municipal sewerage system by the Polish regulations. The permitted concentration of zinc chloride is likely to cause complete BPR inhibition.},
	keywords = {0554:Sanitation, 0775:Environmental engineering, Activated sludge, Applied sciences, Environmental engineering, Heavy metal, Phosphorus removal, sanitation},
	url = {http://search.proquest.com/docview/304793261?accountid=14270},
	author = {Latawiec, Dariusz}
}
