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Comment Environment, Health, Safety & Security

Convert wastewater and CO2 into chemicals with this technology

By Scott Jenkins |

Electrochemical and chemical-precipitation technology from New Sky Energy (Boulder, Colo.; www.newskyenergy.com) allows the conversion of salty wastewater and CO2 from fluegas into valuable process chemicals, such as soda ash, calcium carbonate, sulfuric acid, bleach and other chemicals. New Sky’s customizable system is designed to be installed onsite at a processing facility to work with the chemistry of that plant’s brine waste stream and CO2 exhaust. “Onsite production of chemicals from readily available waste streams reduces transportation costs and reduces CO2 emissions,” says Deane Little, New Sky CEO. The New Sky scheme includes a proprietary electrochemical reactor in which Nafion ion-exchange membranes are stacked between alternating anode and cathode plates, and a small voltage (3 V) is applied across the cell. A salt solution entering the cell between the membranes is split into acid, base, hydrogen and oxygen. The base from this reaction can be combined with CO2 and wastewater to selectively precipitate a variety of magnesium, calcium and other metal salts. New Sky’s combined electrochemical-precipitation process generates a suite of potentially useful chemicals, including carbonates, hydroxides,…
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