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2015-04-07 P & Z Packet
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2015-04-07 P & Z Packet
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Planning for wastewater reuse will also address key implementation challenges; including: (1) <br /> cost and financing of a reclaimed water distribution system; (2) integration of another water <br /> source into the municipal water systems across the region; (3) pricing protocol(s) that captures <br /> as much value as reasonably possible; and (4) streamlining the regulatory permitting process to <br /> move from a "one project, one customer, one permit" approach to a "systems" approach. <br /> In summary, the Council's preliminary plan for wastewater reuse is to: <br /> 1. Increase wastewater reuse within Council wastewater treatment facilities -that is, lead <br /> by example <br /> 2. Implement groundwater recharge and irrigation (for example, golf courses) in East <br /> Bethel as a demonstration project for the region <br /> 3. Pursue wastewater reuse for industrial cooling water, where feasible <br /> 4. Collaborate with the University of Minnesota to demonstrate wastewater reuse at UMore <br /> Park <br /> 5. Develop and implement a plan to address the key implementation challenges associated <br /> with a nonpotable water system for toilet flushing and irrigation uses, and <br /> 6. Integrate nonpotable water systems into plans for future regional wastewater <br /> reclamation facilities. <br /> Regulatory Scenarios for Wastewater Treatment <br /> The Minnesota Pollution Control Agency establishes water quality standards for surface waters <br /> (lakes and rivers) and discharge limits for wastewater treatment plants. Current discharge limits <br /> for the Council's treatment plants include 1 mg/I for phosphorus and seasonal limits on <br /> ammonia nitrogen and organics. <br /> Water quality has improved due to the reduced pollutant discharges from wastewater treatment <br /> plants. However, long-term water quality goals established by the Minnesota Pollution Control <br /> Agency will require substantial reduction of pollution from urban stormwater, agricultural runoff, <br /> and streambank erosion. Federal law focuses compliance and enforcement authority on point <br /> sources of pollutant discharge - that is, wastewater treatment plants and urban stormwater <br /> systems. As a result, the Minnesota Pollution Control Agency may impose more stringent <br /> discharge limits on the Council and its customer communities. This section discusses the <br /> potential implications for the Council's wastewater treatment plants. <br /> Phosphorus. The Council's wastewater treatment plants currently average approximately 0.5 <br /> mg/I phosphorus and 250 million gallons per day flow. The Council has evaluated two regulatory <br /> scenarios. The first assumes that the Council's plants will have to meet a discharge limit of 0.3 <br /> mg/l phosphorus. This limit would require the plants to average approximately 0.2 mg/1 <br /> phosphorus to ensure they comply with the limit. The second scenario assumes a discharge <br /> limit of 0.1 mg/I phosphorus, which is the limit of currently available wastewater treatment <br /> technology. <br /> The 0.3 mg/1 phosphorus limit has been discussed as part of the process of the Minnesota <br /> Pollution Control Agency (MPCA) to establish a limit on the Total Maximum Daily Load of <br /> phosphorus into Lake Pepin on the Mississippi River. However, the 0.1 mg/I phosphorus limit <br /> equals the phosphorus water quality standard for the Mississippi River being considered by the <br /> 43 <br />
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