Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1998-09-11
2000-03-28
Simmons, David A.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210724, 210726, B01D 2101, C02F 152
Patent
active
060427302
ABSTRACT:
A method and apparatus for treating wastewater effluent from a commercial car wash provides for collecting and holding the effluent in a first tank for equalization and to a pH of about 7.0 to 9.5, and then transferring the equalized wastewater to a second tank for either caustification or acidification to a first predetermined pH of up to 10.0, and preferably 8.2 to 8.6, and most preferably 8.4, and then adding a coagulant, preferably a polyaluminum chloride (PAC) with a basicity of 45 to 50% at 400 to 600 ppm, to a second predetermined pH of 6.2 to 7.0 and preferably 6.6 to 7.0, and most preferably 6.8, to effect coagulation at the second pH to form treated water and a sludge. The treated water is decanted from the sludge and filtered to remove 1 to 50 micron particulates. The filtered water is acidified and then passed through a weak base anion exchange resin to remove MBAS to provide treated water. The treated water has substantially removed heavy metals, VOCs and oil and grease to meet the present day stringent environmental standards for discharge to subsurface aquifers, surface or for reuse or recycle. This treatment has first and second treatment tanks in essentially an automated, continuous flow, in-structure, in-ground insulated tank system, in a non-toxic, moderate pH environment with minimal downtime and with cost effective maintenance, and which eliminates outside treatment or discharge of environmentally proscribed wastewater. The treated water may optionally be subsequently filtered such as by carbon adsorption, and sanitized such as by ozonation, and then recycled as feedwater to the car wash, thereby reducing water and energy costs.
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Lawrence Frank M.
Simmons David A.
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