ThermoEnergy Ammonia Recovery Process for Municipal and Agricultural Wastes

Fassbender, A.G.

doi:10.1100/tsw.2001.287

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Ammonium chloride leaching process, wherein ammonium chloride solutions are reacted with metal oxides such as zinc to form zinc ammine chloride [31,32].…”

Section: -70%mentioning

confidence: 99%

A New Process for the Recovery of Ammonia from Ammoniated High-Salinity Brine

et al. 2021

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This paper describes a new method for the recovery of high-concentration ammonia from water in the form of ammonium chloride, ammonium hydroxide and ammonium carbonate. The method was applied to the Solvay process, in which sodium bicarbonate is produced through the reaction of ammoniated brine and CO2 gas. The Solvay effluent contains ammonia in the form of soluble ammonium chloride. The proposed method is based on the recovery of ammonia using a high-alkalinity reactant, calcium oxide (CaO), in a closed electrocoagulation cell operating at a specific current density. The recovered ammonia is collected as a gas within a closed cell containing deionized (DI) water at room temperature. Afterwards, the collected solution (DI water–NH3 gas) is concentrated through a separate process, and is then reused in the Solvay process and other applications. The electrocoagulation process is applied to the treatment cell using aluminum electrodes and a current density of 5–15 mA/cm2. After 7 h of treatment using the electrocoagulation cell, a high reduction of the ammonia concentration—99%—was realized after ~9 h of the electrochemical treatment. The initial ammonia concentration in a Solvay effluent of 13,700 mg/L N was decreased to 190 mg/L N. Furthermore, an ammonia recovery of 77.1% in the form of ammonium hydroxide was achieved. Generally, this process, which starts at room temperature, can result in an energy reduction of 80%—from 7.8 to 2.3 kWh/kg NH3—compared to conventional processes, which entail heating the Solvay effluents to 160 °C. The proposed system and method were found to be suitable for the recovery of ammonia from ammoniated water, and can be utilized for the treatment of landfill leachate, and municipal and industrial wastewater.

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“…Ammonium chloride leaching process, wherein ammonium chloride solutions are reacted with metal oxides such as zinc to form zinc ammine chloride [31,32].…”

Section: -70%mentioning

confidence: 99%

A New Process for the Recovery of Ammonia from Ammoniated High-Salinity Brine

et al. 2021

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“…Typical P management, as currently practiced, cannot be considered effective from a P recovery standpoint, and therefore, extractive nutrient recovery must constitute an important part of future sustainable nutrient management plans [12]. Many wastewater utilities are exploring novel methods of removing nutrients from their effluent, including technologies such as MagPrex, Air-Prex, Prisa, Seaborne, and others [12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

BioWin Modeling of CalPrex Phosphorus Recovery from Wastewater Predicts Substantial Nuisance Struvite Reduction

Vineyard,

Karthikeyan,

Barak

2024

Environments

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The wastewater treatment industry could benefit from new technologies for the removal and recovery of phosphorus (P). The CalPrex precipitation reactor has the potential to recover P in a readily land-applicable form by treating organic acid digestate with calcium hydroxide to produce brushite. Using data from a pilot-scale reactor at the local Nine Springs Wastewater Treatment Plant in Madison, WI, we modified the plant’s BioWin configuration using BioWin 6.2 to model the CalPrex technology and estimate performance under a variety of conditions. We produced dose/response curves for a range of possible lime dosages to estimate the impact of reagent dosage on the quantity and composition of precipitate produced by the CalPrex reactor and characterize the effects on downstream anaerobic digester performance. CalPrex was found to capture 46% of the plant’s influent P, reducing nuisance struvite precipitates by 57% and biosolid sludge production by 14%. The CalPrex module was also tested in two predesigned plant configurations in the BioWin cabinet with the intention of testing applicability to other configurations and searching for the impacts of CalPrex on treatment train performance. This is the first work simulating a full-scale implementation of CalPrex and the first to model interactions of CalPrex with other treatment processes.

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Electrochemically-assisted ammonia recovery from wastewater using a floating electrode

Muster

Jermakka

2017

Water Science and Technology

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This work presents and explores a novel methodology for the removal and recovery of ammonia from wastewater based upon two mechanisms: electrochemical oxidation and a previously unreported electrochemically-assisted surface transfer mechanism. Recovery of ammonia is enabled by placing a porous cathodic electrode at the wastewater-air interface. In this configuration, the cathode creates local alkalinity and an electric field that draws ammonium ions towards the wastewater-air interface, resulting in near-linear reductions of dissolved ammonium irrespective of concentration. This approach leads to significant ammonia recovery without the need for ion-exchange membranes. In addition, anodic reactions that simultaneously occur at depth in the wastewater induce ammonia oxidation in accordance with proven mechanisms. The floating electrode approach offers improved ammonia removal efficiency in comparison to electrooxidation. Trials conducted on synthetic wastewater (900 mg NH-N l) and filtered anaerobic centrate (560 mg NH-N l) demonstrated ammonia concentration decreases up to 216 mg l hr and 110 mg l hr, respectively, under the application of 5 mA cm current density. The technology would be best used to treat municipal and industrial wastewaters possessing high ammonia concentration, including anaerobic digester centrate and urine, and offers potential to assist in removing ammonia from environmental waters.

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ThermoEnergy Ammonia Recovery Process for Municipal and Agricultural Wastes

Cited by 3 publications

References 3 publications

A New Process for the Recovery of Ammonia from Ammoniated High-Salinity Brine

A New Process for the Recovery of Ammonia from Ammoniated High-Salinity Brine

BioWin Modeling of CalPrex Phosphorus Recovery from Wastewater Predicts Substantial Nuisance Struvite Reduction

Electrochemically-assisted ammonia recovery from wastewater using a floating electrode

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