B4-DH-17B l seal order via order code Y Z PK Data position Bevel-helical gearbox B4

Flender/Flender Gear Units/Bevel-helical gearbox B4

ty Consumption and Cost Split by Treatment Unit/Functional Area (January-December Process Unit Distribution (%)Consumption (kWh)Consumption Cost (/yr) Screens 2.3 2,0 1,8 Degritters 0.3 3,3 2,0 PSTs 1.2 1,9 8,3 Balancing Tanks 4.1 4,2 2,9 Aeration 4.2 4,7,8 2,9,2 Bioreactor Mixers 1.3 1,1,1 7,7 Mixed Liquor Recycle Pumps 1.0 1,2,1 7,9 SSTs 0.6 6,3 4,0 RAS Pumps 3.8 4,9 2,2 DAF 6.2 6,4 4,8 Aerobic Digestion 3.5 3,8 2,9 Effluent Pumping 5.3 5,8 3,7 Chlorination 0.6 6,6 3,4 Sludge Irrigation 4.5 5,8 3,8 Buildings and Lighting 4.1 4,2 2,5 Total 1 1,2,9 6,9,7 Aeration blowers accounted for about 4% of the total electricity consumption and cost at 4,7,8kWh/yr and R2, 9 million respectively. 4-1 Figure 4-9: Zeekoegat WWTP 2 Total Billed Electricity Consumption Split 4.5.7 Benchmarking Energy Use As discussed in Section 2, benchmarking is critical to the success of any energy management initiative. By benchmarking energy use, Municipalities can comp are themselves with the rest of the industry then set realistic energy use reduction goals and targets that can bring them in line with the best in the industry. Consumption energy use per kgCOD treated and kWh/pe/yr have been selected as the most robust benchmark criteria for energy consumption rather than per unit flow. The pe is based on 1 gCOD/hd/ which is the typical value for South Africa. The benchmark energy use intensity for Zeekoegat WWTP is summarised in Table 4-1. Table 4-1: Zeekoegat WWTP Energy Use Intensity Based on 2 Consumption Values Total Consumption Aeration Consumption kWh/kgCOD treated 1.6 0.7 kWh/pe COD 1/yr 5 2 /kgCOD treated 1.4 0.6 /pe COD1/yr 4 2 4-1 No benchmark energy use intensity figures are av ailable for South African plants to serve as comparison. Most of the international energy studies give energy use intensity per unit of flow. While this is useful for hydraulic equipment such as pump ,