Research Project Summary Information
Alternative treatment and energy management system for the Windham WWTP(ST10882)
Delaware Operations, Inc.
In recent years the New York City Department of Environmental Protection (NYCDEP) has mandated enhanced treatment for wastewater treatment systems located within the NYC watershed. An industry standard for enhanced treatment is a microfiltration-based system, which can be both energy and chemically-intensive and requires a highly trained staff to operate.
A unique configuration of wastewater treatment technologies capable of achieving enhanced treatment were installed and operated at pilot-scale at the Windham Waste Water Treatment Plant (WWTP). The system included a mechanical fine screen, a clarifier with pre-coagulation, a continuously backwashed up-flow sand filter with pre-coagulation, a membrane bioreactor (MBR), and disinfection.
The alternative configuration uses significantly less energy, requires less manpower, and generates less sludge than a comparable conventional microfiltration-based system. Additionally, the alternative configuration has a smaller footprint than most conventional systems.
The goal of a more environmentally benign wastewater effluent coupled with a reduced operational budget was verified by this four-month pilot project at the Town of Windham WWTP. Optimization of upstream unit processes, supplemented by a solar energy component, helped to reverse the practice of energy-intensive downstream treatment in achieving highly polished wastewater effluent. With stabilized mixed liquor suspended solids (MLSS) at approximately 2200 milligrams per liter (mg/L), and mixed liquor volatile suspended solids (MLVSS) of approximately 1500 mg/L, the aeration requirements for the system were significantly less than that of a conventional activated sludge system. Biological sludge production was minimal. MBR effluent quality was excellent: 5-day biochemical oxygen demand (BOD5) and total suspended solids (TSS) values were below detectible levels of 5 mg/L; coliform bacteria were absent; ammonia concentrations were less than 0.1 mg/L; phosphorus concentrations were less than 0.1 mg/L; and turbidity was always less than 0.1 nephelometric turbidity units (NTU). The configuration has wide application for new and retrofit construction. The system’s small footprint, coupled with its reduced energy consumption and excellent effluent quality, can benefit numerous watersheds.
Delaware Operations, Inc.
8-12 Dietz St Ste 303
Oneonta, NY 13820
On-site Process Improvement
NYSERDA Contact Information
R&D - Environment & Energy Res