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Project Name: Biological Pretreatment System Design
Country: USA
Description: This textile client's manufacturing facility discharged wastewater to the local county treatment plant and was required to comply with pretreatment limits for numerous parameters. Of specific concern are limits for pH and biochemical oxygen demand (BOD). The pH limits of 6.0 to 10.0 and the BOD average limit of 300 mg/l have been periodically exceeded resulting in permit violations. At the client's request, an evaluation of the feasibility of using an aerated lagoon for pretreatment was conducted. The process model indicated that equalization would likely provide compliance with pH and BOD limitations. However, the analysis also indicated that the growth of biological solids may result in suspended solids concentrations which exceed the pretreatment limit. Based on this analysis, the client commissioned the design of an aerated lagoon which could be converted to a biological sequencing batch reactor (SBR) in the event that suspended solids compliance could not be accomplished. Designed and constructed the pretreatment facilities which included a 150,000 gallon basin, influent screening, aerators and continuous pH monitoring and recording. The basin was designed to allow conversion to a SBR with minimal changes to the structures. Due to permit compliance schedule requirements, the project was expedited and placed into service only four months after notification to proceed with construction was received.
 

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