Okla. Admin. Code § 252:656-17-3

Current through Vol. 41, No. 19, June 17, 2024

Section 252:656-17-3 - Sludge and scum removal

(a)Scum removal. Provide scum collection and removal facilities, including baffling, for all settling tanks.

(b)Sludge removal. Design collection and withdrawal facilities for rapid sludge removal.

(1)Sludge hopper. The minimum slope of the sidewalls of sludge hoppers shall be 1.7 vertical to 1.0 horizontal. Hopper floors shall not be larger than 2 feet in diameter if round, or 2 feet on any side if square. Hopper wall surfaces shall be made smooth with rounded corners to aid in sludge removal.

(2)Sludge removal piping. Each hopper shall have an individually-valved sludge withdrawal line at least 6 inches in diameter for gravity withdrawal or pump suction. Design sludge withdrawal to maintain a 3 fps velocity in the withdrawal pipe. Provide for rodding or back-flushing individual pipe runs.

(3)Sludge removal control. Provide equipment to view, sample and control the rate of sludge withdrawal. Provide a means of measuring the sludge removal rate. Air lift type of sludge removal will not be approved for removal of primary sludges. Include time clocks and valve activators to regulate the duration and sequencing of sludge removal for sludge pump motor control systems.

Okla. Admin. Code § 252:656-17-3

Added at 17 Ok Reg 1140, eff 6-1-00; Added at 28 Ok Reg 1282, eff 7-1-11