Meeting the New EPA Coal Combustion Residual Ruling
For coal-fired power plants that are faced with adhering to the new EPA Coal Combustion Residual ruling, Veolia has developed a customized, technology-driven process to help the sector comply with these new stringent ash basin and wastewater management requirements.
Designed to help plants mitigate their operational risk and liabilities, our Comprehensive Ash Management solution incorporates some of Veolia's most effective and proprietary water treatment and separations technologies, including Actiflo® and Hydrotech™ Discfilters. Independently, each of these proven technologies can deliver viable solutions for one component of the ash and wastewater management cycle. But when combined into a singular package, this system deliver a truly sustainable solution for managing all the ash, wastewater and storm water at your power plant.
With more than 800 references all over the world, Veolia's ACTIFLO® technology has been applied to municipal and industrial water and wastewater treatment for more than 20 years. ACTIFLO® is a high rate compact water clarification process in which water is flocculated with microsand and polymer in a Turbomix® draft tube.
The microsand enhances the formation of robust flocs and acts as ballast, significantly increasing their settling velocity. The unique characteristics of the resulting microsand ballasted flocs allow for clarifier designs with very short retension times, high rise rates and extremely compact system footprints that are up to 50 times smaller than other clarification processes of similar capacity. Key benefits of ACTIFLO® include:
- High treatment efficiency with a removal rate of turbidity greater than 90%
- Can be entirely automated and remotely controlled
- Veolia offers prefabricated package plants (1,000 to 10,000 cubic meter capacity per day) which can be combined for larger flow rates
Details on Hydrotech™
The Hydrotech™ Discfilter is a gravity fed self-cleaning filter that offers a large filter area in a small footprint. Solids catch on the inside of the filter panels mounted on the two sides of the disc segments, raising the water level which triggers a level sensor to start the disc to rotate and a backwash cycle begins. High pressure rinse water washes the solids off the filter media into the solids collection trough. Typically the backwash requires .05 to 3% of the total filtered water flow. This filtration technology can be combined Actiflo®, but may also be used independently based on the composition of the water being treated.
- Can filter media with pore sizes as small as 10 microns
- Cost-effective technology that provides water conservation and energy savings
- Flexible processing options; easy to operate and maintain