flender spannsatz H2-DV-22-D Helical gear units H2

Flender/Flender Gear Units/Helical gear units H2

and Green Drop programs. Municipalities should already start using the gu idelines for energy conservation and energy generation in their strategic planning proces ses, and include specific targets for energy efficiency in their operations in the Water Services Development Plans (WSDPs). Energy audits should be undertaken on yearly basis. Loose liaison should be established and maintained with energy suppliers (Eskom), and water services providers and authorities should be aw are of and pursue the offerings in the rebate program. 1.2 ENERGY USE IN ACTIVATED SLUDGE PROCESSES 1.2.1 Overview In biological wastewater treatment, aeration co nsumes the most energy accounting for anything between 5 to 6% on nitrifying activated sludge pl ants. Figure 1-1 shows an example of electricity requirements for an activated sludge plant based on data from the USA (Crawford & Sandino, . Table 1-1 gives wastewater treatment plant energy consumption figures for other selected countries which further confirm the high en ergy consumption by aeration. Figure 1-1: Example of Electricity Requirements for Activated Sludge Wastewater Treatment (Source: WERF, Table 1-1: Energy Consumption at Wastewater Treatment Plants for Selected Countries based on data from NEWRI ( (Source: Swartz, % Energy Consumption Austria Austria (Strass)Sweden China (Beijing) Japan Iran Preliminary & Primary 1 2 2 3 4 5 Aeration 7 5 4 5 4 7 Sludge Thickening, Dewatering & Digestion 1 1 1 5 3 7 Pumping 4 9 1 1 1 1-4 1.2.2 Energy Conservation Measures for Aeration Systems in Activated Sludge Plants Because of the high energy use associated with ae ration, energy conservation measures (ECMs) that focus on reducing aeration energy consumption have been universally found to yield the most energy efficiency gains at wastewater treatment facilities that use the activated sludge process. Not all the energy used is required to meet process demand