Testing Corrective Action Strategies to Mitigate the Impact of Toxic Shock Events in Activated Sludge Systems

Pinto, Ameet J.; Guest, Jeremy S.; Love, Nancy G.; Shaw, Andy; Fairey, Andrew W.; Iler, Patty L.; Earle, John K. (Jake); Shellenbarger, David; Barker, Douglas E.

doi:10.2175/193317707x256973

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…In fact, the increased hydraulic loading to the CA train caused incomplete nitrification resulting in nitrite accumulation (data not shown). The pilot plant-scale experiments with hypochlorite affirmed the conclusions made by the laboratory scale studies (Pinto et al 2007). …”

Section: Mitigating Hypochlorite Shockssupporting

confidence: 74%

“…The CAPM's developed are a multi-tiered decision making tool that address (1) the nature of the contaminant, (2) the data available on process effects of the contaminant, (3) plant specific operational flexibility, and (4) instructions for process monitoring during and immediately after a toxic shock event. The complete CAPMs have been published in Water Practice (Pinto et al 2007). The two corrective actions tested in this study involve 1) chemically enhance primary treatment (CEPT) and 2) sludge diversion and storage.…”

Section: Corrective Action Strategymentioning

confidence: 99%

“…Information on the likely process effect(s) and the appropriate corrective actions to take that will keep the treatment process functional is largely unavailable at this time. A comprehensive strategy to address such upset events would require 1) an upset early warning system (UEWS) (Shaw et al 2006, Love & Bott 2000 to detect the presence of toxins upstream of the WWTP, 2) detailed source-cause-effect matrices to correlate process changes to nature of toxin present (Love et al 2005, Henriques et al 2007, Kelly et al 2004, and 3) a framework for corrective action strategies to mitigate the contaminant-related process effects and facilitate rapid recovery (Pinto et al 2007). …”

Section: Introductionmentioning

confidence: 99%

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Remedial Intervention Strategies for Wastewater Treatment Plants Exposed To Toxic Chemical Stress: Pilot Scale Evaluations

Pinto¹,

Love²,

Fairey³

et al. 2009

proc water environ fed

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The detection and mitigation of toxic shock events is crucial for wastewater treatment facilities, especially nutrient removal plants. There is a lack of information on appropriate corrective action strategies to mitigate the process impact of toxins. We present a study that evaluates the effectiveness of a wastewater treatment plant specific corrective action plan matrix in the mitigation of calcium hypochlorite and cadmium shock events. The high reactivity of hypochlorite and the resulting rapid dissipation does not require the implementation of any remedial action. The presence of a primary clarifier provides sufficient hydraulic barrier to allow for complete hypochlorite dissipation. Both corrective action strategies tested in this study were able to mitigate the impact of the Cd stress event; however their efficiency was largely dependent on the influent flow levels. This study also examines the signal reliability of an array of sensors used for detection of toxin upstream of the treatment system and for monitoring the process upset and recovery. The sensors used in this study include pH, ORP, conductivity, dissolved oxygen, and ultra-violet (UV) absorption based sensor for carbon and nitrate monitoring. The pH, conductivity, dissolved oxygen sensor signals were robust to process condition and showed minimal loss of signal accuracy. The ORP sensor was the most sensitive in measuring small changes in water chemistry and exhibited a short response time. However, it was very susceptible to signal drift in the influent line as well as the aeration basin. The UV based sensor lost its accuracy to carbon measurements over time, while still maintaining its precision and sensitivity.

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Section: Mitigating Hypochlorite Shockssupporting

confidence: 74%

Section: Corrective Action Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Remedial Intervention Strategies for Wastewater Treatment Plants Exposed To Toxic Chemical Stress: Pilot Scale Evaluations

Pinto¹,

Love²,

Fairey³

et al. 2009

proc water environ fed

Self Cite

View full text Add to dashboard Cite

show abstract

“…Providing the adaptation of bacterial population, the nitrification process has the ability to withstand shocks and is controlled with precise monitoring and more chemical use. However, in the case of more than 70 ppm ammonia, the process is uneconomical and impossible to control. − In an experimental investigation, Sabbah et al studied the potential application of tuff as a matrix for ammonia removal in an intermittent flow biofilter in comparison with sand. They perceived from the research that the tuff filters possess superior performance in ammonia removal compared to sand filters, which is able to be justified because of better adsorption capacity of tuff for ammonia compared to sand because its specific surface area is 50 times higher than the specific surface area of the sand .…”

Section: Introductionmentioning

confidence: 99%

Process Design of Ammonia Separation for Nitrification Control in Aeration Basins at an IKORC’s Oily Wastewater Treatment Unit

et al. 2020

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In the current decades, water shortage is well understood as one of the main limiting factors for oil industry development all over the world. One of the available and reasonable solutions is reusing wastewater. The oily wastewater treatment unit of the IKORC oil refinery provides a portion of the makeup water for cooling towers, applying physical, biological, and chemical treatments. Ammonia shocks are the only crisis that disrupts the nitrification process. This condition eventuates in destroying the microorganisms of aeration basins and leads to a high ammonia containing effluent. In order to protect the aeration process, it is mandatory to apply a suitable system for removing excess ammonia. In this study, at first, ammonia removal history is reviewed. Then quantity and quality of the oily sewer are investigated. Because of high volatility of ammonia contamination and high TDS, a stripping tower with air is selected among diverse solutions. Taking into account the principles of project econometrics, operating parameters such as stripping factor, pressure drop, tower volumetric flow rate, and number of towers are determined. Then, the process is designed and its environmental survey is conducted. Finally, calculating indices proved that this project is economically profitable in addition to its environmental benefits.

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Effects of selected industrial pollutants on urban WWTPs activated sludge population, and possible mitigation strategies

Callegari

Capodaglio

2017

Water Practice and Technology

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This study concerns the effects on microbial populations and treatment plant performance on the presence of Chromium and surfactants in incoming wastewater. The study considers two actual treatment plants in a northern Italian City, one treating mostly urban sewage, the second a mixture of urban and industrial wastewater. A comparative assessment of the two plants was performed in laboratory conditions, in order to understand the effects of these exogenous contaminants on the biological processes, and possibly define management and operational criteria for process recovery in the case of renewed actual contamination. Pilot processes of the two plants were run at first, considering the actual design and normal influent conditions of the facilities, then, under stress conditions, by adding the external contaminants at known concentrations to the feed, performing process functionality observations and toxicity tests, and determining the qualitative and quantitative characteristics of the activated sludge biomass. Considerations on processes performance and biocenosis modifications due to pollutants contents are drawn. A discussion on possible effects mitigation strategies is included.

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Testing Corrective Action Strategies to Mitigate the Impact of Toxic Shock Events in Activated Sludge Systems

Cited by 3 publications

References 14 publications

Remedial Intervention Strategies for Wastewater Treatment Plants Exposed To Toxic Chemical Stress: Pilot Scale Evaluations

Remedial Intervention Strategies for Wastewater Treatment Plants Exposed To Toxic Chemical Stress: Pilot Scale Evaluations

Process Design of Ammonia Separation for Nitrification Control in Aeration Basins at an IKORC’s Oily Wastewater Treatment Unit

Effects of selected industrial pollutants on urban WWTPs activated sludge population, and possible mitigation strategies

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