Ithaca WWTP, NY: Target: Self Sufficiency
Ithaca WWTP, NY was featured under Sustainable Operations of TPO on July 2015 . The article includes the following:
Plant Basic Information & Objectives:
- With 13 MGD design and an average flow of 7 MGD, the Ithaca waste water treatment plant meets most of its power needs by using its biogas generation system.
- In mid-1980’s, the Ithaca plant design consisted of two digesters, a cogeneration unit, and a trucked waste receiving facility.
- In 2011, a performance contract was granted to Johnson Controls to upgrade the biogas system, replace the generation system, and improve efficiency and sustainability.
- The performance contract included $8.2 million in projects and guaranteed close to $9 million in savings over a 20 year period.
Digester Mixer Upgrade:
The plant replaced its rotary lance mixing system with Ovivo’s LM™ technology, leading to better mixing, and the ability to generate stable biogas production using less than 10 hp to mix the 1.4 million gallons in the digester.
The 35,000 cubic feet Ovivo Ultrastore™ dual membrane gasholder adds flexibility to the management of a consistent, gas-production flow of 130,000 cubic feet per day used for microturbines and digester heating.
Waste Receiving Facility Upgrade:
The old receiving facility (wooden-pole barn) was renovated into a $3 million high-bay structure. With this upgrade, the plant started accepting about 500,000 gallons of trucked-waste monthly: septage, grease-trap waste, yogurt, whey, dairy processing waste, municipal biosolids, and high strength waste from an animal carcass digester at Cornell University.
- The cogeneration engines and the existing gas cleanup system (by Unison Solutions) and were replaced with four new 65 kW Capstone®*
- The new digester equipment and new biogas generation system provides up to 120,000 kWh per month, 40 percent of the plant’s electricity usage.
- New Turblex®* aeration blowers and dissolved oxygen controls pushed this number up to 60 percent.
- With the added provision of food-scrap waste from Cornell University, Ithaca will write a new chapter on achieving its goal of becoming 100 percent self-sufficient, and converting excess biogas to alternative energy sources like biodiesel production for use or revenue.
*Capstone is a registered trademark of Capstone Turbine Corporation.
*Turblex is a registered trademark of SIEMENS ENERGY, INC.