Power Generation

Leading-edge water treatment technology for Power Plants

Envirogen offers a range of environmental and process solutions for wastewater management that can help meet environmental goals, such as selenium and nitrate reduction, and reduce costs.

Meeting Compliance Challenges

In November, 2019, the U.S. EPA signed a proposed revision of the regulations known as Effluent Limitations Guidelines and Standards or ELGs affecting wastewater management from steam electric power plant flue gas desulfurization (FGD) scrubbers. The net results are that arsenic and selenium limits got relaxed; mercury and nitrate/nitrite-N limits got more stringent; and the federal compliance window got pushed back 2 years to December 31, 2025. For those plants who will need to comply with the revised ELGs, Envirogen has leading-edge solutions for treating wastewater to remove metals, selenium, nitrate and other contaminants.

FGD Wastewater

Envirogen Technologies offers the most reliable biological technology for treating FGD wastewater: The Fluidized Bed Reactor (FBR). In addition to delivering the most consistent removal of selenium and other metals, the FBR offers the benefits of greater system reliability and significantly lower costs than other commercially-available technologies. Envirogen has the broadest background and installation-base of biological treatment systems for selenium and other oxyanions in the industry. For denitrification, Envirogen’s FBR is the most reliable system on the market today for high nitrate concentrations. Our long track record of designing, building and operating biological systems offers the engineering community and power utilities a strong partner in developing reliable, least-cost solutions to managing FGD wastewater treatment operations to meet Effluent Limitation Guidelines (ELGs).

To learn more about Envirogen’s treatment options for Flue Gas Desulfurization wastewater,, download our FGD Fact Sheet here.

Legacy Wastewater and Coal Combustion Residue Leachate

Envirogen offers a solution for meeting selenium and other metal discharge requirements associated with legacy wastewater and Coal Combustion Residue (CCR) leachate. Our Advanced Metals Removal System (AMRS) utilizing select Zero Valent Iron media is a stand-alone technology for a number of metals. Our AMRS can enhance traditional physical/chemical metals removal systems by adding the capability of polishing especially recalcitrant metal forms, such as selenate, downstream. A recent validation study conducted on legacy wastewater stored in a coal ash pond demonstrated the performance of the AMRS to remove selenate from 200-250 μg/l down to below 1 μg/l.

To learn more about Envirogen’s pilot success in CCR Ash Pond Water, here.

CCR Impacted Groundwater

For sites where the groundwater may be impacted by Coal Combustion Residue leachate, Envirogen offers groundwater extraction and treatment systems for hydraulic control, removal of arsenic and other metals, O&M services and groundwater monitoring. Envirogen has extensive experience treating selenium, arsenic, mercury, chromium, lead, thallium, iron, manganese, aluminum, vanadium, cadmium, copper and other metals.

To learn more about our work in Groundwater Remediation click here

Research, Development and Piloting Capabilities

In addition to designing full scale water treatment systems, we also offer small, bench-scale studies and on-site pilot-testing to validate system design and fully meet the client’s requirements. Using fundamental research, we can identify the optimal and most effective water treatment system for a particular site.

Envirogen Experience

For FGD systems with Selenium water treatment needs, Envirogen is on the forefront of modeling biological system performance.

Read more about our well received presentation at the EPRI Selenium Summit 2019 where Envirogen expert Paul Togna explained all the most recent research and learnings around selenium treatment and our groundbreaking predictive modeling.

Envirogen Presents at EPRI Selenium Summit