MOB™ Process in an SBR

The Washington Township Waste Authority (WTWA) SBR is a two train, 250,000 GPD SBR process with 4-hr cycle times. In March 2020, WTWA installed Nuvoda’s MOB™ Process in one of the two trains. Over the course of a ten month trial, a significantly increased flow through the MOB™ Process train was used to test and demonstrate the MOB™ Process’ ability to handle both increased flow and peak flow events(> 1 Ox design). Results showed the MOB™ Process in the SBR was capable of handling up to 70% increased flow above design while maintaining effluent discharge requirements, and in the case of phosphorus, lowering effluent levels at increased flow. Furthermore, the MOB™ Process also handled the very high peak flow events(> 1 Ox design) while maintaining effluent TSS levels and clarity.

PROJECT BACKGROUND

The Washington Township Waste Authority (WTWA) SBR is a two train, 250,000 GPD SBR process with 4-hr cycles. In March, 2020, WTWA SBR installed Nuvoda’s MOB™ Process Trial in one of the two trains. Throughout the trial, the WTWA SBR have collaborated with Nuvoda to conduct sample collections and effluent quality tests twice a week. During the trial, the Washington Township Waste Authority SBR conducted flow diversion with weirs to slowly increase flow distribution into the MOB™ Process train (from rated capacity to 70% increase over rated capacity). These process changes were recorded and presented in this report. The unchanged SBR will be labeled as “CAS” (Conventional Activated Sludge), and the MOB™ trial SBR will be labeled as “MOB™”.

PEAK FLOW PERFORMANCE COMPARISON