Langley Gulch Power Plant Water/Wastewater Evaluation Project

Idaho Power Company, New Plymouth, 
Idaho

Langley Gulch Power Plant Water/Wastewater Evaluation Project

Service Type: 
Idaho Power Company

Idaho Power Company’s objectives were to optimize the use of existing shallow well river water supply and evaporative pond capacity, optimize costs associated with annual power production costs, and reduce O&M costs through process improvements. Carollo performed an evaluation of the operation of the existing water and wastewater systems at the plant through development and evaluation of an overall water balance in terms of flow rates and chemical composition of each stream. In preparation of the analysis, the project team performed sampling and collected chemical consumption and flow monitoring data throughout the facility. Processes evaluated included the facility’s High Efficiency Reverse Osmosis (HERO) and clarification process, effects on returning excess cooling tower blowdown back to the process, and analyzing the use of UF product water for backwashing the UF and HERO systems. The results of the analysis provided recommendations for improving balance between service water production and service water consumption through process and equipment modifications.