Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1997-03-03
1998-09-15
Woo, Jay H.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210683, 210709, 210724, 210726, C02F 142, C02F 152
Patent
active
058074872
ABSTRACT:
A method and apparatus for treating wastewater effluent from diversely laundered household wash as in a laundromat provides for collecting and holding the effluent in a first tank for at least an average wash cycle for equalization and to a pH of 8.5 to 11, and then transferring the equalized wastewater to a second tank for acidification to a first predetermined pH of not less than about 6.5 and preferably 6.5 to 6.9, and then adding a coagulant, preferably a PAC with a basicity of 45 to 50%, to effect a second predetermined pH of not less than about 5.0 and preferably 5.2 to 5.4 for 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 then passed through a weak base anion exchange resin to remove MBAS to provide treated water. The system produces treated water which meets 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 and requires minimal downtime with cost effective maintenance, and which eliminates outside treatment or discharge of environmentally proscribed wastewater. The treated warm water may optionally be sanitized such as by ozonation and then recycled as feedwater to the laundromat, thereby reducing water and energy costs.
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Feldman Marvin
I.P. Licensing, Inc.
Morrison Betsey J.
Woo Jay H.
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