AWWA ACE68564

AWWA ACE68564 Energy Consumption of Micro- and Ultrafiltration, Reverse Osmosis, and Ozone Systems
Conference Proceeding by American Water Works Association, 11/01/2008

Kwan, Pierre; Brant, Jonathan; Boyd, Glen; Chang, YuJung

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