A Utility's Journey to Evaluate Alternatives and Craft a Collection System Odor and Corrosion Control Strategy

This presentation shares the unique journey undertaken by the Manasquan River Regional Sewerage Authority (Authority) to understand the odor and corrosion issues in their system and the systematic steps taken to study, sample, evaluate, and select a holistic solution. The project is divided into three phases: Study, Chemical Trial, and Design Phases. During the Study Phase, air and wastewater hydrogen sulfide (H2S) data was collected and a triple bottom line (TBL) evaluation was performed to recommend potential improvements for odor and corrosion control. Results from the Study Phase indicated that the Authority’s system is generally functioning well, but there are hot spots in the system that need to be addressed locally. These locations were the focus of the TBL evaluation, which evaluated three alternatives using economic, social, and environmental criteria. The recommended alternative was evaluated during a three-month Chemical Trial that showed that the Authority’s systems can be treated effectively using calcium nitrate (i.e. Bioxide) and/or hydrogen peroxide (H2O2) to reduce H2Sand dissolved sulfide concentrations. As of March 2021, the Study Phase and Chemical Trial have been completed and the Design Phase is in progress. Calcium nitrate systems will be implemented at two meter chambers within the Authority’s system. A technology evaluation was completed for implementation of odor control systems to mitigate odors and corrosion at two pump stations. A new carbon column system will be implemented at Upper Manasquan Pump Station (UMPS)while a high plume up-blast exhaust fan will be implemented at the Lower Manasquan Pump Station (LMPS). Civil, process, structural, mechanical, electrical, and instrumentation and controls components were included in the designs.