WTE Power Plant Saves 1.3 Million GPD of Water Daily with Tertiary Water Treatment & Recycling

Covanta’s Delaware Valley energy-from-waste facility in Chester, Pennsylvania, has saved 1.3 million gallons a day from local water supplies by installing Ge…

Source: www.environmentalleader.com

>” […] The Chester facility generates up to 90 megawatts of clean energy from 3,510 tons per day of municipal solid waste. Previously, the plant used 1.3 MGD — or nearly 5 million liters a day — of municipal drinking water in its waste conversion process, costing the company thousands of dollars in daily water purchases.

To reduce facility operating expenses and the consumption of local water resources, Covanta Delaware Valley upgraded the facility by installing GE’s RePAK combination ultrafiltration (UF) and reverse osmosis (RO) system as a tertiary treatment package. The new system enabled the plant to reuse 1.3 MGD of treated discharge water from a nearby municipal wastewater treatment plant for the facility’s cooling tower.

GE installed two RePAK-450 trains, each producing 450 gallons per minute of purified water. As a result, Covanta Delaware Valley has eliminated the need to purchase 1.3 MGD of local drinking water a day, which results in a substantial financial savings in addition to the environmental benefits.

GE’s RePAK equipment was delivered in 2014, with commissioning taking place the same year, making Covanta Delaware Valley the first North American company to deploy GE’s RePAK technology.

Covanta chose a combined water treatment technology approach because the typical organic and dissolved mineral content of the wastewater requires additional treatment to be suitable for use as cooling tower makeup. RO was selected as the technology of choice, and UF was required as the pretreatment solution.

GE’s RePAK combined treatment system reduces the equipment footprint up to 35 percent as compared to separate UF and RO systems. By combining the UF and RO into a common frame with common controls and GE’s single (patent-pending) multi-functional process tank, GE also is able to reduce the capital costs and field installation expenses when compared to the use of separate UF system and RO systems with multiple process and cleaning tanks, the company says.”<


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Innovations in waste water treatment processes to provide clean energy

See on Scoop.itGreen Energy Technologies & Development

The race is on to develop innovative, cost-effective ways to extract value from waste water instead of just dumping it, writes Sadhbh Walshe

Duane Tilden‘s insight:

>In a conventional treatment process, ammonia is converted back into nitrogen gas, a non-harmful gas which can be safely released into the atmosphere. The conversion process is expensive, however, and energy prohibitive.

What the Stanford team do, instead, is to use a less energy-intensive process to convert the ammonia into nitrous oxide (N2O), a powerful substance that is typically used to turbo-boost cars or fire rockets.

Normally, N2O is discouraged from forming because it is a harmful greenhouse gas, but when it is burned along with methane it becomes an energy source that can be used to power the treatment facility. According to Scherson, there is a double energy-saving benefit.

“Our process reduces energy input in nitrogen treatment and then the energy from nitrous oxide can potentially be used to power the plant making it energy neutral or even energy positive.”<

See on www.guardian.co.uk