Upgrading treatment capacity and meeting discharge limits
To upgrade and increase treatment capacity, the Siloam Springs wastewater treatment plant has incorporated a custom-designed biological nutrient removal (BNR) process without filtration. The new bioreactor is producing a discharge total phosphorus (TP) of less than 0.3 mg/L and nitrate less than 10 mg/L. The BNR treatment process involves a combination of anaerobic, anoxic, and aerobic zones to target effluent phosphorus and nitrate concentrations. If TP permit limits become more stringent, pilot testing membranes demonstrated the plant can consistently produce effluent phosphorus levels at 0.025 mg/L. Garver also developed an operations and maintenance (O&M) manual, which contains an explanation of design criteria for each treatment process. In addition, this contains the theory of operations and control scheme for each process, along with troubleshooting guides and an emergency operating response plan.
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