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

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The effect of toxic shock inputs on wastewater treatment plants (WWTPs) requires that operators know the probable process effect from the contaminant(s) and the appropriate operational corrective action(s) to take to minimize or mitigate the impact of the shock event. The wastewater treatment industry currently lacks a systematic framework of tested response guidelines and corrective action protocols to be implemented during and after toxic shock events. In this paper, we present the testing of corrective action plan matrices (CAPMs) developed for two biological treatment configurations (conventional and 5-stage Bardenpho) experiencing a toxic shock event. The two configurations were shocked with calcium hypochlorite and corrective actions stipulated by the CAPMs were performed. Results indicate that corrective actions implemented were not suitable for the simulated shock event and may lead to longer recovery times for the perturbed systems. This study highlights the need for contaminant and WWTP configuration-specific corrective action strategies.

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Keywords: CORRECTIVE ACTION STRATEGIES; PROCESS CONTROL; TOXIC SHOCK

Document Type: Research Article

Publication date: 01 November 2007

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  • Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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