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Project Details

Wastewater Project

  Currently the United States Department of Defense weapon system operations rely on metal hydroxide precipitation to treat metal finishing wastewaters. While somewhat effective, the growing chemical complexity of materials used in weapon system maintenance operations as well as the increased use of low volatile organic compound (VOC) industrial cleaners have expanded the presence and concentration of chelating substances associated with these wastewaters. Chelating substances can be organic or inorganic chemicals that have that have the net effect of stabilizing regulated heavy metals in aquatic environments. The greater the stability of the regulated metals, the more difficult it is to remove the regulated wastewater streams, which leads to greater risk of regulatory non-compliance. A partial list of chelating substances detected in the treatment plant influent include citrates, carboxylic acid, oxalic acid, phosphate, ethylene diamine tricarboxylic acid, diamines, triamines, ammonium nitrate, cyanide, sulfamate, tartrates, gluconate, hydroxy acetic acid, benzenesulfonic acid as well as various proprietary chemicals used for paint stripping and decreasing metal surfaces. DoD weapon system maintenance facilities have few options available to remove the effects of chelators on regulated metal removal other than chemical oxidation and/or flow segregation. Unfortunately, application of chemical oxidizing agents to eliminate chelating substances can be prohibitively expensive while exposure to strong chemical oxidants increases the health and safety risks to DoD facility personnel. Similarly, the capital as well as the operation and maintenance costs associated with segregating chelator affected flows from other industrial wastewater flows can be exorbitant. Recently, the Ferrous Chloride chemical treatment process has been demonstrated to be effective at the treatment plant in treating industrial wastewater commingled with chelating substances. The Ferrous Chloride chemical treatment process represents a potential low cost method to manage chelated impact waste streams. To facilitate making technically and economically defensible decision regarding the use of the in-line Ferrous Chloride chemical treatment technology.

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