Aerzen's AERprocess dissolved oxygen control is an integrated solution for controlling DO concentration and blowers in an activated sludge...
Agency already was in process of reviewing standards when recent study was released
The U.S. Environmental Protection Agency (EPA) issued the following statement and background information in response to a study released on Dec. 20 by the Environmental Working Group:
“EPA absolutely has a drinking water standard for total chromium, which includes chromium-6 (also known as hexavalent chromium), and we require water systems to test for it. This standard is based on the best available science and is enforceable by law. Ensuring safe drinking water for all Americans is a top priority for EPA. The agency regularly re-evaluates drinking water standards and, based on new science on chromium-6, had already begun a rigorous and comprehensive review of its health effects. In September, we released a draft of that scientific review for public comment. When this human health assessment is finalized in 2011, EPA will carefully review the conclusions and consider all relevant information, including the Environmental Working Group’s study, to determine if a new standard needs to be set.”
The current EPA total chromium standard is 0.1 mg/L (100 parts per billion).
EPA reported that its latest data showed no U.S. utilities were in violation of the standard.