H3-DV-5-D flender 中国 Helical gear Reduction Boxes H3

Flender/Flender Gear Units/Helical gear Reduction Boxes H3

ears. JP Marais is an old plant constructed in 1. The de sign of the activated sludge process is typical of most activated sludge processes of this era that were not designed for energy efficiency. The plant uses traditional slow, single-speed surface aerators which ha ve low energy transfer efficiency. In addition the aeration design is not tapered and aeration control was designed to be semi-automated but was manually controlled in 2 due to equipment breakdowns. Total annual power consumption at the plant was 3,3 MWh at cost of R3.1 million. Aeration accounted for 7% of the 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%. (ii) 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. (iii) 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. (iv) 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 savi ngs greater than 4%. Flow balancing also results in simplified more efficient process a