C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/3
C02F 3/28 (2006.01)
Patent
CA 1060126
Abstract of the Disclosure In a process for the biological purification of a waste water containing organic contaminants which comprises passing the waste water through an anaerobic filter or equivalent anaerobic digestion apparatus, a portion of the purified filter effluent is recycled to the filter Inlet and mixed with the waste water entering the filter. The recycle rate is maintained at a level at least high enough that the liquid mixture entering the filter does not contain contaminants in a concentration which is above the level at which they inhibit the life processes of the microorganisms contained in the filter. This avoids destruction or inhibition of the biological process occurring within the filter. In many cases it also eliminates, or sub- stantially reduces, the need for employing alkaline reagents to adjust the pH of the waste water prior to treatment inasmuch as the effluent commonly contains alkaline bicarbonates (produced in the treatment process) which may not be contained initially in the waste water.
226561
Cave James P.
Humphrey William J.
Witt Enrique R.
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