H2-VH-4-D flender graffenstaden sas Helical speed reduction gearbox H2

Flender/Flender Gear Units/Helical speed reduction gearbox H2

1 1 Consumption Cost /yr 2,9,1 2,4,0 2,4,0 Consumption Cost Saving /yr 4,1 5,1 % Consumption Cost Saving % 1 1 Demand Saving kW 8 8 Final Effluent Quality * FSA mgN/ 0.4 0.8 0.8 Ortho mgP/ 0.3 0.0 0.0 Nitrate/Nitrite mgN/ 6.0 1.5 1.0 Model predicted values in Table 4-1 indicate that implementing advanced process control (with ammonia based aeration control) utilizing the existing aeration equipment results in: Potentially 1-1% savings in power consumption and costs. Demand savings of 8-8 kW is also realised as results of savings in consumption Average final effluent nitrate/nitrite concentrate of 1-1.5 mgN/; 7-8% below the average baseline value and permit limit of 6 mgN/. Average Ortho concentration of 0.0-0.0 mgP/; achieving near complete Ortho removal. Model predicted final effluent Ortho and nitrate/nitrite concentrations are much lower than the current measured values as well as those predicted with optimised process control in Section 4.7.1. Model predictions show that there is no signifi cant difference in the energy savings as well as final effluent quality between the two modes of ammonia based control. In practice FF-FB ammonia on DO control is more accurate as it uses model (ASIM type) to predict the oxygen demand based on the influent ammonia concentration and therefore yields higher energy savings. However FF-FB ammonia on DO control requires more sensors and control algorithms and is therefore more complex to maintain and operate. 4.7.3 Complex High Capital Investment Measures Replace Old Module 1 Blowers Module 1 single stage centrifugal blowers are replaced with turbo blowers similar to the ones for Module 2. Table 4-1 summarises the model predicted energy and cost savings that can be achieved with the same control strategies discussed in Sections 4.7.2 and 4.7.3. 4-2 Table 4-1: Comparison of Model Predicted Energy and Cost Savings for Replacing Module 1 Blowers Units Baseline Replace Old