Comparison of mineral acid pretreatments for sulfide removal

Duranceau, Steven J.; Anderson, Richard W.; Teegarden, Robert D.

doi:10.1002/j.1551-8833.1999.tb08637.x

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Tray aerators are commonly used for natural anaerobic systems and have been applied for the simultaneous separation of CO 2 and H 2 S (Duranceau et al, 1999;Lochrane, 1979;Duranceau and Faborode, 2012). Feedwater is distributed from the manifold into the top tray, subsequently flowing under gravity over the sides into trays below, eventually entering into an open collection basin at the base (Figure 4d).…”

Section: Tray Aeratorsmentioning

confidence: 99%

Dissolved gas separation for engineered anaerobic wastewater systems

Heile

Chernicharo

Brandt

et al. 2017

Separation and Purification Technology

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Dissolved gases produced within engineered anaerobic processes subsequently create a fugitive emission which can have financial, environmental and health and safety implications. Whilst desorption technology has been used to control dissolved gases in the drinking water sector, there is considerably less understanding of its deployment in wastewater for which there are numerous existing and emerging challenges. This review therefore focuses on existing and proposed technological approaches to gas desorption in engineered anaerobic wastewater processes, with specific emphasis on technology compatibility and downstream gas phase management. Simplified engineered solutions such as diffused aeration and multi-tray aerators appear robust solutions for implementation into wastewater. However, these processes are characterised by a low mass transfer coefficient and require high gas to liquid ratios (G/L) to achieve reasonable separation, which suggests their suitability is limited to small scale applications, in which gas recovery is not a priority. Packed columns and membrane contactors afford process intensification through increasing interfacial area which favours large scale applications; although both will require prefiltration technology to obviate media clogging. Vacuum or steam is the preferred driving force for separation when gas recovery is sought, while sweep-gas is energetically favoured. Sweep-gas has been used for gas recovery by operating at G/L toward the equilibrium value, which somewhat constrains mass transfer. Process selection must therefore be weighted on whole life cost, but will also be dependent upon process scale, financial (e.g. incentivisation) and non-financial (e.g. carbon) instruments, which are strongly influenced by regional policy.

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Section: Tray Aeratorsmentioning

confidence: 99%

Dissolved gas separation for engineered anaerobic wastewater systems

Heile

Chernicharo

Brandt

et al. 2017

Separation and Purification Technology

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“…Sulfide will also cause significant residual chlorine demand on distributed water, which negatively impacts water quality, and can contribute to corrosion of residential copper tubing and other plumbing appurtenances. Tray aerators were a common selection for water treatment of groundwater because a water purveyor could achieve removal of carbon dioxide and hydrogen sulfide gases (Lochrane 1977, Duranceau et al, 1999.…”

Section: List Of Tablesmentioning

confidence: 99%

“…The removal of CO 2 during aeration increases the pH of the water, thereby causing a shift in the ionization equilibrium, thereby forming more dissolved sulfides (HSand S 2-) that cannot be removed by aeration (Duranceau, 2004a;Wang et al, 2006). Therefore, the removal of CO 2 or the increase in pH must be controlled to increase the removal efficiency of H 2 S by aeration (Duranceau, 1999).…”

Section: Addition Of Oxygen To Groundwater For the Oxidation Of Mangamentioning

confidence: 99%

Predictive Modeling of Sulfide Removal in Tray Aerators

Duranceau

Faborode

2012

Journal AWWA

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and Lake Hamilton, Florida for allowing the use of their facilities to facilitate the completion of my thesis. Thanks to Professor Anozie, Mr. Bamimore, Miss Susaye Douglas and Dr. Shonibare for their time and valuable input that was necessary for completion of this project, this is greatly appreciated. Thanks to Maria Pia Real-Robert, Vito Trupiano, and Chris Boyd for their help when I needed it the most, and a special thanks to Jayapregasham Tharamapalan for his time spent with me in the laboratory during my testing. I appreciate all your time and effort. vii

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“…Spiral‐wound RO membrane systems are commonly designed to operate at a constant flux rate (i.e., producing constant permeate flow). During the life span of the membrane elements, the feed pressure is adjusted to compensate for changes in feed temperature, salinity, and permeate flux as fouling and/or compaction of the RO membranes occur (Abdulrazaq, 2011; Duranceau et al, 1999). – describe the relevant calculations for normalizing the specific flux of the permeate flow.…”

Section: Introductionmentioning

confidence: 99%

Canary in a membrane plant: A sentinel against membrane scaling

Tharamapalan

Duranceau

2014

Journal AWWA

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A two‐element membrane pressure vessel was installed as a “canary” unit on a full‐scale reverse osmosis (RO) membrane process to monitor scale formation while changes in the plant's pretreatment processes were implemented. Sulfuric acid pretreatment ahead of an RO process was to be progressively reduced and discontinued per the findings of a pilot study. To safeguard the full‐scale membrane process against unforeseen failure caused by scaling when sulfuric acid was eliminated from the RO feedwater, the canary unit was introduced. Concentrate from the second stage of the RO process train served as the feed stream to the canary unit, thereby allowing the canary to provide an earlier indication of scaling in lieu of scaling the full‐scale RO process. The canary unit was intended to act as an early warning to operators who could intervene to protect the RO plant from unforeseen loss of membrane productivity resulting from scaling.

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Comparison of mineral acid pretreatments for sulfide removal

Cited by 8 publications

References 13 publications

Dissolved gas separation for engineered anaerobic wastewater systems

Dissolved gas separation for engineered anaerobic wastewater systems

Predictive Modeling of Sulfide Removal in Tray Aerators

Canary in a membrane plant: A sentinel against membrane scaling

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