Showing papers on "Enhanced biological phosphorus removal published in 1984"
TL;DR: In this article, the aeration basin of an activated sludge treatment plant fed with dye-works waste waters was added to powder activated carbon (PAC) to increase the purifying capacity of the plant.
53 citations
TL;DR: The results obtained tend to confirm the hypothesis that biological phosphorus removal is due primarily to the bacterial strain Acinetobacter, and Pure culture tests have confirmed the possibility of a greater phosphorus storage capability of AcinetOBacter.
29 citations
TL;DR: In this article, the metal removal behavior of mixed liquor from a laboratory-scale activated sludge simulation, operated at a range of sludge ages from 3 to 12 days, were treated with formaldehyde in order to obtain a metabolically inactive biomass.
Abstract: Samples of mixed liquor from a laboratory-scale activated sludge simulation, operated at a range of sludge ages from 3 to 12 days, were treated with formaldehyde in order to obtain a metabolically inactive biomass. The metal removal behavior of this biomass was compared with that of untreated biomass. Only Cu and Ni were found to exhibit a high degree of removal in the presence of active biomass. Manganese, Cd, Co, and Tl demonstrated removals little affected by the activity of the biomass, and at longer sludge ages more metal was taken up by formaldehyde-treated than by untreated cells.
26 citations
TL;DR: The A/0 system is a modified form of the activated sludge process employing an anaerobic zone to promote biological phosphorus removal as discussed by the authors, which is a state-of-the-art system for biological nutrient removal.
23 citations
TL;DR: Study of the individual phosphate uptake properties of various bacteria found in the biomass of a pilot designed for enhanced biological phosphate removal from wastewater found that Bacillus cereus can absorb 0.45 pg of phosphate during the growth phase and Pseudomonas cepacia can absorb just 0.01 pg during the stationary phase.
Abstract: The purpose of the present paper is to study the individual phosphate uptake properties of various bacteria found in the biomass of a pilot designed for enhanced biological phosphate removal from wastewater. Following pure culture study it was observed that Bacillus cereus can absorb 0.45 pg of phosphate during the growth phase. During the stationary phase Bacillus cereus and Pseudomonas cepacia absorb respectively 0.08 and 0.01 pg of phosphate in order to maintain their energy metabolism. Since Acinetobacter plays an important role in the biological phenomena of phosphate removal, the effect of acetate, the prefered growth substrate of this strain, was studied. In a meat‐extract medium without acetate, phosphate accumulation by Acinetobacter Lwoffi is approximately 30 mg.l‐1 of culture. In a medium with a heavy concentration of acetate, a pure culture of Acinetobacter Lwoffi with the same bacterial concentration consumes four times as much phosphate. Observations made with an electron microscope...
18 citations
Journal Article•
TL;DR: Procede d'epuration des eaux usees industrielles par boues activees. Adjonction d'une zone non aeree en amont du bassin d'aeration, performances de ce systeme.
Abstract: Procede d'epuration des eaux usees industrielles par boues activees. Adjonction d'une zone non aeree en amont du bassin d'aeration, performances de ce systeme
14 citations
Journal Article•
TL;DR: Techniques such as scanning electron microscopy, transmission electron microscope and 31P nuclear magnetic resonance (NMR) have demonstrated that the phosphate removed is stored within bacterial cells as polyphosphate.
Abstract: Several commercially available systems claim to remove phosphate biologically from municipal wastewater. Techniques such as scanning electron microscopy, transmission electron microscopy and 31P nuclear magnetic resonance (NMR) have demonstrated that the phosphate removed is stored within bacterial cells as polyphosphate. Acinetobacter species are usually isolated from phosphate-removing systems although there is a great deal of evidence which casts doubt on the exclusive role of these organisms.
11 citations
TL;DR: Return activated sludge when kept without aeration and addition of sewage, showed higher dehydrogenases activity; and on aeration, but without addition of wastewater, it showed progressively lower dehydrogenase activity.
Abstract: A study of dehydrogenases activity of activated sludge, return activated sludge, and waste activated sludge from three sewage treatment plants was made. Dehydrogenases activity and protein content of the mixed liquor varied along the aeration basin. Chromium chloride and zinc sulfate were found to be inhibitory to dehydrogenases activity. Return activated sludge and waste activated sludge, in spite of higher content of volatile suspended solids, contained lower dehydrogenases activity. Return activated sludge when kept without aeration and addition of sewage, showed higher dehydrogenases activity; and on aeration, but without addition of sewage, it showed progressively lower dehydrogenases activity.
11 citations
9 citations
Journal Article•
TL;DR: In this paper, the mechanism of sorbent enhancement of activated sludge treatment is discussed and a first-order reaction in which an apparent rate constant describes the overall (biological and sorption) substrate removal.
TL;DR: In this article, a 12 month pilot plant experiment was performed to evaluate the effect of simultaneous precipitation with ferrous sulphate on effluent quality with respect to both phosphorus, BOD and suspended solids.
Journal Article•
TL;DR: In this article, a three year investigation was undertaken on the Boksburg and Pretoria, Republic of South Africa (RSA) biological filter sewage purification works to evaluate and further develop existing techniques for phosphate and nitrogen removal.
Abstract: A three year investigation was undertaken on the Boksburg and Pretoria, Republic of South Africa (RSA) biological filter sewage purification works to evaluate and further develop existing techniques for phosphate and nitrogen removal. It was demonstrated that the upgrading of this type of works to meet the RSA regulatory effluent phosphate standard of 1 mg/E dissolved orthophosphate (as P), is practically feasible under local conditions. It was also shown that by relatively minor process additions and modifications an effluent with a nitrogenous matter content of less than 10 mg/l (as N) can be produced.
Journal Article•
TL;DR: The removal of excess activated sludge from biological purification plant treating crude oil refining wastewaters by the method of aerobic digestion was studied and enrichment of the aerating air in oxygen increased the efficiency of sludge digestion by about 10%.
Abstract: The removal of excess activated sludge from biological purification plant treating crude oil refining wastewaters by the method of aerobic digestion was studied. In stationary system 58% of excess sludge was removed within 32 days. In semicontinvous system (with daily addition of sludge) 85--64% of the sludge was removed, depending on amount of excess activated sludge added. Enrichment of the aerating air in oxygen (10% v/v) increased the efficiency of sludge digestion by about 10%.
TL;DR: 3‐amino‐1: 2: 4‐triazole (AT), a potent weed killer, added to activated sludge, caused immediate and drastic reduction in oxygen uptake by biomass.
Abstract: 3‐amino‐1: 2: 4‐triazole (AT), a potent weed killer, added to activated sludge, caused immediate and drastic reduction in oxygen uptake by biomass. AT, a known specific inhibitor of catalases of animal and plant sources, did not appreciably alter catalase of activated sludge biomass.