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stoichiometry process for removal of phosphorus

Stoichiometry of carbon, nitrogen, and phosphorus through the ...

mates into and out of the N and P pipes and showed the net removal rates of N and P by inland waters were less than those for C. The C : N : P stoichiometry of inland water inputs vs. exports differed due to large respiratory C and N losses, and efficient P burial in inland waters. Residence time plays a critical role in the

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Uncertainty and variability in enhanced biological phosphorus ...

Uncertainty and variability in enhanced biological phosphorus removal (EBPR) stoichiometry: Consequences for process modelling and optimization Article in Water Science & Technology 61(7):1793-800 ...

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BIOLOGICAL NUTRIENT REMOVAL

Recognition of the operative mechanism in a biological phosphorus removal process led to the concept of the BOD 5 to Phosphorus Removal ratio as a means for characterizing biological phosphorus removal process performance (Daigger, et. al., 1990; Sedlak, 1991).

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Chemical removal and recovery of phosphorus from excess ...

We describe a process for the recovery of phosphorus from excess sludge in a sewage treatment plant that currently uses polyaluminium chloride for chemical phosphorus removal. Instead, we employed alkaline dissolution of excess sludge with calcium phosphate precipitation to recover phosphorus from sewage.

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Phosphorous removal from wastewater - Lenntech

The first process is included in the general category of chemical precipitation processes. Phosphorous is removed with 90% efficiency and the final P concentration is lower than 0.5 mg/l. The chemical dosage for P removal is the same as the dosage needed for BOD and SS removal, which uses the main part of these chemicals.

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Wastewater Basics 101. - US EPA

Phosphorus Removal Chemical treatment Phosphate is an anion: PO. 4 3- Cations can be added to bind with phosphate Ca. 2+ Al. 3+ Fe. 3+ Naturally occurs in soil systems Except sandy soils Each form an insoluble precipitant

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Optimizing Chemical Phosphorus Removal

Chemicals used for Phosphorus Precipitation Chemical Formula Removal mechanism Effect on pH Aluminum Sulfate (Alum) Al 2 (SO4) 3.14.3(H 2 O) M.W. = 599.4 Metal hydroxides removes alkalinity Ferric Chloride FeCl 3 M.W. = 162.3 Metal hydroxides removes alkalinity Poly Aluminum Chloride Cl Al n Cl (3n-m) (OH) m Al 12 12 (OH) 24 Metal hydroxides ...

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Phosphorus and Nitrogen Removal from Municipal Wastewater ...

This valuable new book offers practical guidance regarding the design and operation of systems for reducing effluent nitrogen and phosphorus. The principles of nitrogen and phosphorus removal are discussed, including sources of nitrogen and phosphorus in wastewater, removal options, nitrogen and phosphorus transformations in treatment, process selection, and treatment. The book also covers the ...

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Nutrient Removal - Total Phosphorus

anaerobic stage of a enhanced biological phosphorus removal (EBPR or bio-P) process are not able to perform biological phosphorus removal. PAOs are microorganisms (bacteria) that uptake and store orthophosphate in excess of their biological requirements. PHAs are energy-rich carbon polymers inside a bacterial cell, which are converted from

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Contrasting responses of nitrogen: phosphorus stoichiometry ...

Intensive grazing (e.g., heavy grazing or longterm grazing) had in general more positive effects on plant N:P stoichiometry and negative effects on soil N:P stoichiometry than light grazing. Responses of plantsoil N:P stoichiometry to grazing greatly varied depending on plant functional group identity, plant organizational level (i.e ...

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The stoichiometry of carbon, nitrogen, and phosphorus in ...

The stoichiometry of carbon, nitrogen, and phosphorus in particulate matter of lakes and oceans R. E. Hecky Department of Fisheries and Oceans, Central and Arctic Region, Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba R3T 2N6

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Process Design Manual For Phosphorus Removal

5.7 References 5-31 6 PHOSPHORUS REMOVAL IN TRICKLING FILTERS BY MINERAL ADDITION 6.1 Pre-Design Decisions 6-1 6.2 Process Options 6-1 6.3 Performance Data Using Aluminum Salts 6-2 6.4 Performance Data Using Iron Salts 6-8 6.5 Choice of Chemical Addition 6-8 6.6 Nature and Role of Chemicals Involved 6-9 6.7 Dosage Selection and Control 6-10 6.8 ...

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Stoichiometry of carbon, nitrogen, and phosphorus through the ...

Stoichiometry of the freshwater pipe: The challenge. Our understanding of freshwater systems in the context of the global carbon (C) cycle has benefited greatly in the past decade from the development of the pipe model (Cole et al. 2007; Tranvik et al. 2009) and a concerted research effort to understand C biogeochemistry in inland waters.

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The stoichiometry of carbon, nitrogen, and phosphorus in ...

The stoichiometry of carbon, nitrogen, and phosphorus in particulate matter of lakes and oceans R. E. Hecky Department of Fisheries and Oceans, Central and Arctic Region, Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba R3T 2N6

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BIOLOGICAL PHOSPHOROUS REMOVAL

phosphorous removal rates were possible through biological selection. Today enhanced biological phosphorus removal (EBPR) can increase the biological phosphorus removal rate to 5 percent or more with proper process design and operation. EBPR is a two-step process. In the first step, phosphorous is converted to a soluble form. In the second

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Towards more efficient nitrogen removal and phosphorus ...

That is: most of the ammonium in the digestion effluent is transferred into the nitrogen gas in one-stage PNA reactor with the partial produced nitrate in the effluent. At the same time, with the proper calcium addition, the phosphorus is also removed through the HAP crystallization within the biomass in reactor.

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Phosphorus Monitoring and Removal in Wastewater

However, phosphorus occurs as several different forms throughout the wastewater process and understanding its distribution is vital to monitoring and removal. One important tool for phosphorus removal is an online orthophosphate analyzer for monitoring effluent orthophosphate and controlling phosphorus removal strategies.

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Biological Removal of Phosphorus - Wastewater Treatment

The current trend in biological phosphorus removal is development of a simultaneous nitrification, denitrification, and phosphorus removal process that can save capital and operational costs as well as leave a smaller environmental footprint. Figure 5.3. A schematic diagram of metabolisms of PAOs under anaerobic and aerobic conditions.

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Phosphorus Treatment and Removal Technologies

Less complicated than biological approaches, the chemical treatment design approach consists of a mass balance between chemical addition, the stoichiometry of the chemical added and phosphorus removed, and the phosphorus concentration after chemical addition. Chemical addition should be evaluated for two scenarios: 1.

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Stoichiometric model of the aerobic metabolism of the ...

10.1002/bit.260440709.abs In the aerobic phase of the biological phosphorus removal process, polyβhydroxybutyrate, produced during anaerobic conditions, is used for cell growth, phosphate uptake, and glycogen formation. A metabolic model of this process has been developed. The yields for growth, polyphosphate and glycogen formation are quantified using the coupling of all these ...

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POTW PHOSPHORUS REMOVAL PROCESSES

process designs are typically not adequate (and non-flexible) to consistently remove total phosphorus conc. less than 1.0 mg/l neorsd plants utilize ferric chloride addition to the primary or secondary clarifiers to meet permit limits consistent phosphorus removal less than 1.0 mg/l is achieved at widely ranging flowrates

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A Review of Anoxic Wastewater Treatment: An Overlooked Aspect ...

5.1.1. Stoichiometric Equations Phosphorus Removal Using Metal Salts. Critical design and economic factors that affect the phosphorus removal efficiency of chemical precipitation treatment systems are: i. Metal salt dose. ii. Wastewater characteristics, iii. Method of chemical addition, iv. Chemical addition feeding point(s), v. Reaction pH, vi.

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A structured metabolic model for anaerobic and aerobic ...

A structured metabolic model is developed that describes the stoichiometry and kinetics of the biological P removal process. In this approach all relevant metabolic reactions underlying the metabolism, considering also components like adenosine triphosphate (ATP) and nicotinamideadenine dinucleotide (NADH 2 ) are describedbased on biochemical pathways.

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