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Water Management Techbook 2018

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EPmag.com | April 2018 | 51 WATER MANAGEMENT: CASE STUDIES more horsepower to push air deeper, but air wants to return to the surface, and the additional power increases the cost, while the operation still suffers from poor distribution of oxygen. Another concern for floating systems is the run- ning of electrical power into a pit creating a potential electrical safety concern. This is when submersible systems become a viable option. Submersible aer- ation provides the distribution of oxygen needed throughout the water volume, doesn't pose the elec- trical shock concerns and uses far less energy, but it typically requires an empty pit or tank to deploy, which can pose a concern for deployment. Nobody wants to drain and take a pit out of service. Case study: Permian Basin produced water pit This case study explores the advantages of a portable, submersible aeration system that allows submersible aeration to be deployed into water. The case study also evaluates performance and discusses metrics that should be monitored to evaluate performance of aeration systems. The most common failure in the application of aeration for produced water is the sizing of the system. It is not uncommon for an operator to sim- ply base the size of an aeration system on water volume, which is wrong. The water quality and its oxygen demand must also be taken into account. It is this missing piece that creates failed aeration programs, which unfortunately happen more often than expected—consider not only biological oxygen demand but other reducers in the water that will consume oxygen like sulfides and iron. Once enough data are acquired and water quality changes over time have been considered, the system is sizable. In this specific case study, about 1,000 cf/m of air for a 450,000-bbl pit was needed. Once sized, the blower and aeration system were deployed, taking initial tests of the pit before and after deployment. Using oxidation reduction potential (ORP), general water quality was determined and, as expected, the Water aeration processes could result in cost savings for handling produced water compared to conventional pit treatments. (Photo courtesy of Hydrozonix)

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