Sustainable Odor - FOG Control & Management at Hawaii Domestic Wastewater Collection System

Presentation Description: The Coco Palms lift station, and its downstream areas have long been posing very high concerns about
hydrogen sulfide generation, resulting in multiple odor complains. Additionally, multiple lift stations
require frequent clean-outs, stressing the limited resources. A paradigm of technology evaluation was,
therefore, carried out in response using a bioaugmentation approach that would turn the entire sewer

system in a partial bioreactor, enabling this way for a comprehensive approach, over the conventional on-
site or hyperlocal methods of management. The technology evaluation phase car 6 months, and the

technology was integrated into critical areas within the wastewater collection system. Initial results
reflected that the FOG deposits within sewers and lift stations started to break down at a noteworthy
pace, followed by a drop in odor levels. By the end of the first month, all odor complaints were completely
eliminated along with reducing the FOG-related cleanings needed from monthly to 1-2 times a year. Upon
completion of the technology evaluation period, once dosing was stopped, FOG accumulation and odor
complaints recurred in about five weeks; therefore, it illustrated the efficacy of the comprehensive
approach in long-term mitigation of the problems. This presentation presents the results of the project
with respect to the impacts on odour control and FOG management, and discusses opportunities that
exist for adopting this paradigm approach as a viable, cost-effective solution for maintaining the
wastewater system on Kauai and elsewhere.