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A case study on the Moorefield Wastewater Treatment Plant system upgrade with the MOB™ process
Justin Bell, Jason Calhoun
Nuvoda US, United States of America;
In 2013, a partnership between the Town of Moorefield, West Virginia and a local poultry factoryresulted in the construction of the 6.2 MGD Advanced Nutrient Wastewater Treatment Plant (WWTP) to improve the region’s discharge quality into the Chesapeake Bay Watershed.The state-of-the-art 5-stage biological treatment process currently treats a combination of industrial (90%) and municipal (10%) flow to meet the stringent discharge limits. Soon after start-up, the Moorefield WWTP encountered multiple issues caused by the waste flow from the poultry process. The variable industrial influent is high in nutrient concentration but low in BOD; this forced the WWTP to rely heavily on expensive chemicals to meet the discharge limits. Moreover, the sanitation chemicals from the industrial process caused several biological upsets in 2016, costing the Moorefield WWTP $200,000 to recover.
Faced with high operation cost and unpredictable effluent quality, the Town of Moorefield WWTP underwent a process upgrade using Nuvoda’s MOBTM (Mobile Organic Biofilm) Process in March 2017. The MOB™ process is a novel and sustainable wastewater treatment process to improve settleability, increase treatment capacity and improve process stability. This process utilizes a highly renewable lignocellulosic material harvested from Kenaf (Hibiscus cannabinus) as a substratum for biofilm growth. The adsorptive Kenaf with high surface area is machined to approximately 0.5 mm in size, allowing them to act as media for fixed film and granular sludge growth. This hybrid media adaptively grows a stratified microbial community that facilitates robust and simultaneous biological nutrient (C, N, P) removal, and is free to circulate into the secondary clarifiers to improve settleability.
Comparing the data from April 2016 to February 2018, the Moorefield WWTP has seen 80% reduction in SRT, 87% reduction in SVI, 96% reduction in effluent TSS and no system upsets after the MOB™ process was installed. The successful upgrade with MOB™ has helped the Moorefield WWTP save at least 50% of total operation cost since March 2017.
2:00pm - 2:45pm
An Assessment of Operational Tools for Characterizing BPR Activity and Evaluating Process Health
Gavin Bushee, Peter Schauer, Adrienne Menniti
Clean Water Services, United States of America; ,
Consistent and stable BPR is essential in meeting strict effluent limits and providing recoverable phosphorus after the dewatering process. The BPR process has been observed to operate stably over long periods of time, only to become upset during critical times of year. Determining key factors influencing BPR stability is important so that corrective measures that can be taken without relying on chemical phosphorus removal. However, useful data for BPR operations has been limited to effluent phosphate, along with grab or composite sampling for influent and effluent characteristics.
Clean Water Services (CWS) utilizes a number of characterization methods in an effort to better understand BPR process stability and predict upsets before they occur. These methods include sampling and nutrient profiles, in situ phosphate analyzers, bench testing to quantify BPR kinetics and stoichiometry, and sludge analysis for storage products (e.g. PHA and glycogen) and PAO and GAO populations (e.g. qPCR). This work provides an assessment of current BPR characterization methods, as well as results from bench testing, sludge sampling, and online measurements of phosphorus (P) uptake.
Key findings of this study:
Characterization methods such as sampling and nutrient profiles are relatively simple, but provide very limited information in understanding BPR process dynamics and do not provide early warning of upset.
Online analyzers are a useful tool in evaluating process health and provide early warning of process upsets
Batch testing has provided better characterization of the BPR process, provides early warning of upset, and gives useful information for operational decisions (e.g. shifting fermenter VFA in response to low P uptake)
Online P uptake measurements show promise as a tool to assess process health and may help better identify conditions that impact BPR activity, although like batch testing and other advanced techniques, comes at a greater cost and effort level compared with other methods