Bevel-helical gear Reduction Boxes B4 Y Side Special seal order via order code Y Z QK B4-HV16-B

Flender/Flender Gear Units/Bevel-helical gear Reduction Boxes B4

total energy usage at 2,4 MWh/yr and cost of R2.3 million. Aeration energy use intensity, which serves as benchmark for the plant was 3 kWh/pe COD 1/yr (0.9 kWh/kgCOD treated). The value is 4% higher than that for Zeekoegat Feasible aeration energy conservat ion measures were as follows: () Simple measures utilizing existing process and aeration equipment Optimal process and aeration resulting in potential cost savings of about 1% (vi) Low to medium capital investment measures utilising the existing aeration equipment Fully automating aeration control and implemen ting advanced process control with ammonia based aeration control. Potential cost saving of 2% and payback period of 1.1 years. (vii) High capital investment replacing existing surface aerators This measure requires complete redesign of the aeration system and replacing the surface aerators with either fine bubble diffused aeration, hybrid aerator/mixers or dual impeller surface aerators. Potential cost savings of 3-3% can be achieved with payback periods ranging from 5.8 to 6.4 years. (viii) High capital investment installing an influent balancing tank Installing balancing tank combined with an ef ficient aeration system similar to the one at Zeekoegat plant will yield maximum energy savings greater than 4%. Flow balancing also results in simplified more efficient process and aeration control systems For both plants implementing advanced process cont rol strategies resulted in optimal process and aeration control which improved bo th denitrification and enhanced biological phosphorus removal. Model predicted final effluent nitrate/nitrite and Ortho Phosphate values were significantly lower than the baseline measured values as we ll as licence discharge limits. While the models predict substantial savings in aeration energy and costs, cognisance has to be taken of the challenges of practically implementing energy conservation measures. Some of the challenges