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RETENTION-BASED SOLUTIONS FOR OUTFALL REDUCTION
Abstract
The discharge emanating from a municipal wastewater treatment plant (WWTP) is a contributing factor to the pollution load within the adjacent natural water body. Generally, effluent constraints can be upheld during periods of dry weather. Nonetheless, instances of surpassing these limitations are common during storm events due to the substantial surge in inflow. The retention of incoming stormwater presents an opportunity to mitigate both quantitative and qualitative concerns. However, the spatial and financial prerequisites for constructing such facilities necessitate comprehensive deliberation. Hydrodynamic simulations utilizing EPA Storm Water Management Model (SWMM) were conducted for the network model encompassing the catchment area of the WWTP. This aimed to assess the efficacy of retention-based measures implemented at the wastewater treatment facility and its associated catchment, utilizing extensive historical rainfall data. Various strategies, including network extensions such as storage tanks, and leveraging existing infrastructure for inline storage, were scrutinized and compared based on their impact on overflow occurrences. The findings underscore the considerable reduction in overflow volumes achieved through the proposed solutions. Nonetheless, they also serve to facilitate an estimation of the retention system's influence on water quality within the receiving water body.
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