WA ST Dept of Ecology 2/15/2022 - Laserfiche WebLink

1. Treatment Process Performance Assessment Assess the nitrogen removal potential of the current treatment process and identify viable optimization strategies prior to implementation. a. Treatment Assessment. Develop a method to evaluate potential optimization approaches for the existing treatment process. Use the evaluation to: i. Evaluate current (pre-optimization) process performance to determine the existing TIN removal performance for the WWTP. ii. Create a list of potential optimization strategies capable of meeting the action level at the WWTP prior to starting optimization. Update the assessment and list of options as necessary with each Annual Report. b. Identify and evaluate optimization strategies. From the list developed in S5.C.1.a.ii, identify viable optimization strategies for each WWTP owned and operated by the Permittee. Prioritize and update this list as necessary to continuously maintain a working set of strategies for meeting the action level with the existing treatment processes. The Permittee may exclude any optimization strategy from the initial list created in S5.C.a.ii that was considered but found to exceed a reasonable implementation cost or timeframe. Documentation must include an explanation of the rationale and financial criteria used in the exclusion determination. If the Permittee finds no viable optimization strategies exist for their current treatment processes, they must immediately proceed to the identification of a corrective action under S5.D. c. Initial Selection. As soon as possible and no later than July 1, 2022 select at least one optimization strategy for implementation. Document the expected performance (i.e., %TIN removal or a calculated reduction in effluent load or concentration) for the initial optimization strategy prior to implementation. 2. Optimization Implementation All Permittees in Table 8 must document implementation of the selected optimization strategy (from S5.C.1.c) during the first reporting period in the first Annual Report due March 31, 2023. Permittees must document implementation during every reporting period thereafter. The documentation must include: a. Strategy Implementation. Describe how the permittee implemented the selected strategy during each reporting period, following permit coverage. Including: i. Initial implementation costs ii. Length of time for full implementation, including start date. Puget Sound Nutrient General Permit Page 21