On Aug. 21, the Pennsylvania Environmental Quality Board (EQB) published regulations in the Pennsylvania Bulletin establishing new wastewater treatment requirements for Total Dissolved Solids (TDS). These new effluent standards and requirements will have significant impact on new and expanding sources of high strength TDS, and in particular wastewater from the natural gas development industry. The goal of the regulation is to ensure that the concentration of TDS in Pennsylvania’s streams does not exceed the water quality criterion of 500 milligrams per liter (mg/L).
The TDS Problem
The term “TDS” includes a variety of materials dissolved in water such as inorganic salts, metals and organic materials. TDS begins to cause aesthetic problems, but not human health effects, when drinking water concentrations reach the secondary (recommended) maximum contaminant level established by the U.S. Environmental Protection Agency, 500 mg/L. TDS may cause toxic effects to humans when ingested at higher concentrations. Salinity may also injure aquatic organisms.
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