AWWA ACE68564

This powerpoint presentation presents AwwaRF Project #3056 - Evaluation of Dynamic Energy Consumption of Advanced Water and Wastewater Treatment Technologies. It is sponsored by AwwaRF and California Energy Commission, and its stated purpose includes: quantify actual and theoretical energy consumption of new treatment technologies; evaluate factors that affect energy consumption; and, identify energy optimization opportunities while maintaining treatment performance. Ultrafiltration practices at two WTPs are summarized, and include: strong correlation between energy consumption with water production; increasing efficiency at higher production rates; no correlation between energy consumption and water temperature; and, not enough data between energy consumption and turbidity. Reverse osmosis (RO) treatment practices at three WTPs are summarized and include: TDS has the largest general impact for energy consumption; higher TDS = higher operating pressures = higher energy use; other factors, such as organic fouling, have a major impact; RO has the highest energy consumption; and, well and distribution pumping is the largest overall energy use. Ozonation treatment practices at three WTPs are summarized and include: specific energy consumption can be lowered by operating at higher ozone concentrations; increasing by 1 - 2% ozone (by wt) = 2 - 10% energy savings; and, restrictions due to gas flow or dosing requirements. CLCJAWA's purpose for ozonation changed because facility operating at much lower output than designed, and result is typical of any system with too much unused capacity. Other general optimization steps include: develop a culture of identifying energy savings; at a minimum, review and compare electricity bills against water quality and quantity; inventory your equipment and determine efficiencies; consider using VFDs instead of pumping against control valves; and, incorporate energy data logging capabilities into SCADA system. Includes tables, figures.