Washington Township Waste Authority SBR
Barto, Washington Township, Berks County, PA
Washington Township Waste Authority SBR
Barto, Washington Township, Berks County, PA
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™”.
PROCESS CHANGE TIMELINE
SBR SPECIFICATION MOB PROCESS DESIGN PARAMETERS
TRIAL DATA & ANALYSIS
PEAK FLOW PERFORMANCE COMPARISON
DISCUSSION AND CONCLUSION
SETTLING AND WASHOUT PREVENTION
Despite an increase of capacity of 170% through the MOB™ SBR, the process was able to consistently demonstrate a sludge volume index (SVI) below 80 mg/L. In addition to settling, the MOB™ ballast prevented MLSS washout during peak flow conditions, ultimately avoiding the loss of nitrification and improved effluent. Evidence of the washout prevention can be observed in Section C of Effluent Quality Comparison Images.
PHOSPHORUS REMOVAL
The MOB™ Process demonstrated Total nitrogen< 7.0 mg/L and Total Phosphorus concentrations < 1 mg/L throughout most of the trial despite a 170% increase in capacity. Both nutrient concentrations were well below permitted values and would provide sufficient data for a process rerate which would double capacity.
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