Start-up of a 3 Stage Bardenpho WWTP with a MLSS Sidestream Fermenter

摘要

Lawrence, Kansas has been planning for expansion of its wastewater treatment plant for more than 15 years. Two master planning exercises have revealed that the existing collections system could not support expansion and delivery of sewage to its existing Kansas River Plant, so a new site on the Wakarusa River was selected. The Kansas Department of Health and Environment (KDHE) required the new facility to meet nutrient removal limits of 10 mg/L TN and 1 mg/L TP. This paper documents the start-up of this facility and tracks the start-up of a MLSS sidestream fermentation process. The influent wastewater is characterized as being a fresh sewage, and even with a 3 mile force main to the site, the sewage is still low in rapidly biodegradable COD (rbCOD). The low influent rbCOD would not support good long-term biological phosphorus removal performance with conventional designs. The MLSS sidestream fermentation process is a second-generation design and is demonstrating its capability to overcome the lack of influent rbCOD to produce a reliable low total phosphorus effluent concentration. From Sept 1, 2018 through January 31, 2018 the effluent TP averaged 0.14 mg/L. The Wakarusa River wastewater treatment plant does not have effluent filtration and has not added any chemical carbon supplementation or ferric chloride to augment BPR. The facility has experienced significant influent dilution from a very wet fall and winter, and BPR has not been adversely impacted which does routinely occur in convention flow-through BPR systems. This paper will present both laboratory monitoring data and continuous monitoring data collected at the site. MLSS sidestream fermentation has proven its ability to weather storms and high flow events while providing consistent reliable performance.