Groundwater and airborne volatile organic compound emissions are regulated by myriad rules from the U.S. Environmental Protection Agency. Industrial owners complying with EPA rules generally treat airborne emissions by using activated carbon filters and burning the residue. Waterborne emissions are frequently treated through biotreatment with organisms. Photo: Courtesy Environ Related Links: The Top 500 Design Firms: 2010-2011 at a Glance Why not consolidate the approach, says Carl Adams, global leader for industrial wastewater treatment at ENVIRON International. “Why have two processes to treat one problem?” he asks. ENVIRON launched its VOC BioTreat� process in 2010, which pipes biodegradable airborne VOCs
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.