Performance Testing of Multiple Odor Control Technologies at One WWTP – What Works and What Doesn’t?

The City and County of Honolulu (CCH) owns and operates nine (9) wastewater treatment plants (WWTP) on the Island of Oahu:• The largest facility is the Sand Island WWTP providing chemically enhanced primary treatment• The second largest facility is the Honouliuli WWTP providing primary treatment for all of its incoming flow, and full secondary treatment for approximately half of its present flow• The seven smaller WWTP are located in Kailua, Wahiawa, Kahuku, Laie, Waianae, Waimanalo and Paalaa Kai all providing full secondary treatmentIn 2011 CCH selected AECOM to perform an Odor Evaluation and Preliminary Engineering Report for the Honouliuli WWTP and also for the upstream tributary collection system. The work included the following tasks:• Condition Assessment Report (CAR) for odor control systems at the Honouliuli WWTP and seventeen (17) wastewater pumping stations (WWPS)• Wastewater sampling and laboratory analyses in selected locations at the WWTP and upstream collection system that were established during the Condition Assessments. Wastewater samples were tested temperature, pH, conductivity, total dissolved solids, ORP, chemical oxygen demand, sulfate, sulfide, and chloride• Performance testing of all operating odor control systems at the Honouliuli WWTP• Prepare a Preliminary Engineering Report recommending improvements that are necessary to mitigate odors or upgrade existing odor treatment equipment that is not performing as intendedThe paper shows the performance results for six different treatment systems at the Honouliuli WWTP that were tested as part of the Condition Assessment Report. The data provided useful information for AECOM and CCH to use optimizing operations, and prioritizing necessary capital improvements at the WWTP. The paper presents information that will be interesting and useful for facility owners, operators, and designers to consider when selecting odor control equipment for various applications and process areas. The paper and presentation will provide clear documentation of “what works and what doesn’t” in various odor control applications.