Water resource recovery facilities are increasingly refusing to accept landfill leachate due to rising treatment costs and environmental considerations. John Weigold of Heartland Water Technology explains how landfill managers can avoid these risks by treating leachate onsite using evaporation in a cogeneration configuration.
Cogeneration, also known as combined heat and power (CHP), refers to the use of both power (electrical or mechanical) and thermal energy from a single source, such as a turbine or engine. Today, there are over 4,400 cogeneration systems in the United States in a variety of applications.
Today, an innovative wastewater treatment technology is enabling an entirely new category of cogeneration application, called “CoVAP”, which stands for Cogeneration for Industrial Wastewater Evaporation. CoVAP uses the waste heat from turbines and engines to evaporate challenging wastewaters. In many cases, the evaporation results in only solids remaining (this is called Zero Liquid Discharge.) CoVAP allows companies to realize significant savings associated with managing challenging industrial waste waters.
Novel evaporator. A flue gas desulfurization (FGD) wastewater treatment/concentration pilot project at a 952-MW coal-fired power plant showed that Heartland Water Technology’s LM-HT Concentrator was able to use flue gas heat as an energy source to drive its evaporative process. The test concluded that the concentrator could treat and concentrate FGD wastewater, resulting in a net water volume reduction of 90% to 95% with total dissolved solid levels of more than 400,000 mg/L in the circulating fluid, and yielding a slurry containing 70% to 80% total solids. Fly ash within the flue gas provided a net benefit to the system by aiding in the management and stabilization of precipitated salts from the concentrated brine. Courtesy: Heartland Water