At present, the electric power industry increased. Both in the production process and waste management. The biological wastewater treatment system, sludge system (Activated Sludge) is one of the system with electrical energy needs to help in the treatment of relatively high. In order to wastewater treatment with the standard quality of the effluent.The study found that the aerator (Aeration blower) in the aeration tank of the 2 units, the units 3 air and activate the full amount. Reduced dissolved oxygen (Dissolved oxygen) ranged from 4 - 7 mg / L, respectively. Which is high and not cause benefit system Thus, causing the project to reduce energy consumption in wastewater treatment biological (Energy Saving Program at Biological Wastewater Treatment. Plant), which is the objective of this project is to reduce the energy consumption of water without making the performance of the systems and wastewater quality changes significantly. The switch function of aeration and experiment is 2 range is the permanent closure and closure - open when dissolved in water less than 1 mg / L, respectively. According to computational theory. And the data to compare.The result of the experiment. Treatment system for waste water quality and efficiency changes significantly during 1 effective wastewater treatment system 98% towards permanently closed 1 machine. When calculating the cost to reduce, to 391 680 per year and in the 2 efficiency wastewater treatment system 97% towards on-off when dissolved in water less than 1 mg / L, respectively. Which can reduce the 342 720, per year. The proposed guidelines for reducing power consumption in a biological wastewater treatment system The switch function according to the suitability of the dissolved oxygen in the water.
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