Showing papers on "Enhanced biological phosphorus removal published in 1989"
TL;DR: Anaerobic batch experiments were performed to measure the profile of various parameters when phosphorus accumulating sludge acclimatized under anaerobic-aerobic operation is fed with malic, lactic, pyruvic, propionic and succinic acids as mentioned in this paper.
26 citations
TL;DR: Results from this study suggest that a portion of the inorganic phosphate released through enzymatic degradation of the polyphosphate may be involved in the transport of readily degradable organic material across the cytoplasmic membrane.
22 citations
TL;DR: In this article, carbon flow in enhanced biological phosphorus accumulating cultures was tracked by using radiolabeled glucose and acetate as substrates, and it was shown that the use of acetate ensures that the greatest percentage of added carbon will be sequestered by phosphorus accumulating species.
22 citations
Patent•
21 Jul 1989
TL;DR: In this paper, an activated sludge wastewater treatment process is described, which comprises aerating a mixed liquor comprising phosphate-containing influent wastewater and activation sludge in an aeration or high-purity oxygen zone to reduce the BOD/COD content of the wastewater and to cause the microorganisms present to take up phosphate.
Abstract: There is disclosed an activated sludge wastewater treatment process which comprises aerating a mixed liquor comprising phosphate-containing influent wastewater and activated sludge in an aeration or high-purity oxygen zone to reduce the BOD/COD content of the wastewater and to cause the microorganisms present to take up phosphate. A phosphate-enriched sludge in which the phosphorus is present primarily in the sludge solids is separated from the mixed liquor to provide a substantially phosphate-free effluent. At least a portion of said phosphate-enriched sludge is passed to a phosphate pre-stripping zone, either in a separate tank or within the phosphate stripper tank itself, where BOD/COD-containing water, or feedwater, containing at least 50 mg/L of BOD, is added to poise the sludge organisms to begin enhanced rapid release of dissolved phosphate by pre-stripping it from the sludge or poising the sludge for rapid, enhanced release of phosphate. Then, the sludge is passed to a phosphate stripping zone. In the phosphate stripping zone, the sludge settles to form a supernatant liquor in the stripping zone upper section and settled sludge in the stripping zone lower section. The settled sludge is maintained under anaerobic conditions for a time sufficient to complete the release of the desired amount of phosphate from the sludge solids to the liquid phase of said settled sludge. At least a portion of the anaerobic sludge from the phosphate stripping zone is recycled to the aeration or high-purity oxygen zone as activatd sludge. The phosphate-rich supernatant from the phosphate stripping zone may be applied directly to land, or treated with a chemical precipitating agent to precipitate the phosphate therefrom and the precipitated phosphate may then be removed through the use of a reactor/clarifier, primary or secondary clarifier or other tankage, thus preparing the phosphate for final disposal directly or as fresh, digested or otherwise treated sludge.
20 citations
TL;DR: In this article, mixed primary sewage sludge was incubated anaerobically with and without azide addition to prevent biological activity, and all the chlorobenzenes were removed to varying extents over 32 days of incubation.
15 citations
TL;DR: Two types of granule have been found based on the predominant compound and have been denoted as P- and L-volutin granules, which suggest a similar mechanism to that operational in activated sludge in Acinetobacter.
15 citations
TL;DR: In this article, the effect of acetate, propionate and peptone and waste yeast effluent on the enhanced phosphate removal capacity of bench-scale activated systems was described, and the mixed cultures which developed in such systems proved capable of sustaining enhanced phosphate accumulation even under an unfavourable influent COD/TKN ratio of 8:1.
Abstract: The effect of acetate, propionate and peptone and waste yeast effluent on the enhanced phosphate removal capacity of bench‐scale activated systems is described. The mixed cultures which develop in such systems proved capable of sustaining enhanced phosphate accumulation even under an unfavourable influent COD/TKN ratio of 8:1. All systems achieved high levels of phosphate removal but the propionate and peptone systems outperformed the rest by a large margin. Spectacular removals upwards of 0.10 mg P (rag influent COD)‐1 were achieved. Magnesium and potassium proved vitally important to enhanced phosphate removal. The uptake and release patterns of these ions and sulphate are highlighted.
5 citations
Patent•
08 May 1989
TL;DR: In this paper, a process for the biologically enhanced removal of the phosphorus of waste waters (effluents), biologically enhanced phosphorus removal being achieved in the purification of domestic, municipal and other industrial waste waters - chiefly containing organic substances.
Abstract: The invention relates to a process for the biologically enhanced removal of the phosphorus of waste waters (effluents), biologically enhanced phosphorus removal being achieved in the purification of domestic, municipal and other industrial waste waters - chiefly containing organic substances. In the process according to the invention, the procedure is carried out in such a manner that the waste water - contacted with activated sludge - is subjected to an anaerobic treatment, then an aerobic and/or anoxic and/or other treatment and, if required, the waste water/activated sludge mixture is allowed to settle. It is characteristic of the process that the sludge concentration of the waste water/activated sludge mixture is established prior to the anaerobic treatment - preferably by sludge recirculation - to a value of 0.01-1.5 kg/m , preferably 0.1-0.5 kg/m , while an aerobic pretreatment having a duration of 1-60 minutes, preferably 5-20 minutes, is carried out on the mixture.
5 citations
TL;DR: Fractionation procedures capable of distinguishing intracellular po1yphosphate from extracellular precipitated orthophosphate deserve further investigation and application to activated sludge and are presented.
5 citations
TL;DR: Keywords: Activated sludge; biological phosphorus removal; polyphosphate metabolism; nutritional requirements; metabolic classification; electron acceptor; dissimilatory manganese/iron reduction.
TL;DR: The importance of nitrogen and phosphorus in stimulating eutrophic conditions in receiving waters has been well documented as a result an increased emphasis has been placed on limiting these elements in wastewater effluents In the future, new discharge permits will include limits on both of these elements.
Abstract: The importance of nitrogen and phosphorus in stimulating eutrophic conditions in receiving waters has been well documented As a result, over the last decade an increased emphasis has been placed on limiting these elements in wastewater effluents In the future, new discharge permits will include limits on both of these elements In 1985 a research program was initiated to conduct a pilot plant study of an anoxic/anaerobic/aerobic treatment train using primary effluent The facility was operated at varying flow and Qr/Q ratios, and at effective mixed liquor suspended solids (MLSS) concentrations of 3100 mg/L The results of the first 13 month operational phase indicated that the effluent concentrations of total BOD5, TSS and nitrate nitrogen were less than 5 mg/L Ammonia nitrogen was less than 02 mg/L The solids settleability was excellent, and foaming due to Norcadia, was effectively controlled The average overall phosphorus removal was 48% Influent BOD5 concentrations of less than 100 mg/L signific
TL;DR: In this article, the authors investigated the capabilities of the observed mechanism under the specific circumstances of the existing two large treatment plants in Ruhleben (240,000 m 3 /d) and Marienfelde (100, 000 m 3/d).
01 Jan 1989
TL;DR: It is shown that published biological models of phosphorus accumulating bacteria were useful as general models describing the biomass behaviour in the activated sludge biological phosphorus removal process and if they were suitable as operational and staff training tools.
Abstract: Long term observation of plant operations indicated that published biological models of phosphorus accumulating bacteria were useful as general models describing the biomass behaviour in the activated sludge biological phosphorus removal process. A series of batch and plant trials were carried out to elucidate the processes which take place anaerobically, anoxically and aerobically to evaluate the use of the models and to indicate if they were suitable as operational and staff training tools. Results from selected trials are described in detail and the relevance of the models to plant operations outlined.
TL;DR: This new trouble-free system with porous polyurethane foam pads showed improved capability in nitrogen and phosphorus removal than conventional activated sludge system.
Abstract: Immobilized activated sludge system with porous polyurethane foam pads was operated in time-sequenced anoxic/oxic batch mode for the enhanced nutrient removal. Biomass hold-up in polyurethane foam pads in immobilized sytem increased with incoming organic substrate concentration. This new trouble-free system showed improved capability in nitrogen and phosphorus removal than conventional activated sludge system.
Journal Article•
TL;DR: The 1.2 mgd treatment plant in Salmon Arm, British Columbia, Canada, has operated for almost one year in either of two modes of the four possible modes of plant operation.
Abstract: As an alternative to the activated sludge process for biological phosphorus removal, this paper discusses an alternative which avoids high costs of air supply and large suspended growth tankage, a combination of fixed growth reactors (trickling filters) and suspended growth reactors was developed. The combination is believed to provide an improved environment for the biological phosphorus, carbonaceous, and nitrifying microorganisms. The 1.2 mgd treatment plant in Salmon Arm, British Columbia, Canada, has operated for almost one year in either of two modes of the four possible modes of plant operation. Examination of effluent concentrations of BOD 5 , suspended solids (SS), phosphorus and ammonia nitrogen has been undertaken during this time, and results are discussed.
TL;DR: The results showed that the anaerobic release of phosphate from activated sludge which had been acclimated to an an aerobic-aerobic cycle is principally attributable to a biological mechanism.
Abstract: Activated sludge which had been subjected to an anaerobic-aerobic cycle showed high rates of anaerobic release of phosphate, followed by excess phosphate uptake under aerobic conditions. Addition of carbon and energy sources was essential to anaerobic release of phosphate, and no significant release of phosphate occurred in the absence of added substrates. Heating activated sludge (90°C for 2min) strongly inhibited anaerobic release of phosphate. Treatment of activated sludge with chemical reagents including sodium hypochlorite, benzalkonium chloride and ethanol greatly inhibited phosphate release. Increasing the osmotic pressure in the medium adding sodium chloride and sucrose also inhibited the release. These results showed that the anaerobic release of phosphate from activated sludge which had been acclimated to an anaerobic-aerobic cycle is principally attributable to a biological mechanism.