Biological wastewater treatment process
AssigneeThe Dow Chemical Company
InventorsHenry F. Hauck, Jr., Lawrence J. Landry, Jr., Jen-Hsiang Kao, Sawnra W. Wade, M. Dales Mayes, Stephen J. Caldwell
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Abstract
In a biological wastewater treatment process including secondary clarification, the improvement comprising monitoring the salinity of the wastewater flowing to secondary clarification and adjusting the salinity of the wastewater flowing to secondary clarification by adding water or by adding salt.
Claims12
In a biological wastewater treatment process wherein the accustomed average salt content of incoming wastewater to be treated is about 3 percent by weight or greater, as measured by silver nitrate titration, and including secondary clarification and the use of salt-tolerant microorganisms, the improvement comprising monitoring the salinity of the wastewater upstream of the secondary clarification and increasing the salt content of the wastewater upstream of the secondary clarification to a degree sufficient to maintain acceptable separation and sludge thickening in said secondary clarification step by adding a salt, when decreases in the salt content of the wastewater upstream of the secondary clarification step are observed.
Dependencies are inferred from the claim text.