COMPLIANCE INFO_1992 - 2012 - Laserfiche WebLink

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4 . 1 Operation CLARIFIER TANK The wastewater from the flocculation tank which contains heavy metal which is trapped by polymer and flows to the gravitational flow section of the clarifier tank. From this point, the heavy metal sinks to the bottom of the clarifier tank and the wastewater free of metal flows to the city through the paddle wheel flosensor. The pH probe is located at the gravitational flow section to check wastewater pH before it flows to the City. If 0-6 or 10-12 pH range, the pH probe sends a signal to the pH monitor #3 on the electrical panel to energize the alarm. The timer on the electrical panel is used to energize both, 1 ) 2-way solenoid valve at sludge thickener tank 2) 2-way solenoid valve at clarifier tank. Both valves energize at same time while the 2-way solenoid valve at clarifier tank is energized by the timer . Air then flows through the 2-way solenoid valve and F/R/L unit to the air diagram Wilden pump to operate. The heavy metal in wastewater flows from the bottom of the clarifier tank to the sludge thickener tank. SLUDGE THICKENER TANK The wastewater containing the heavy metal is pumped from the bottom of the clarifier tank to the sludge thickener tank, where the heavy metal of the wastewater has more time to sink to the bottom. The wastewater free of heavy metal at the top of the sludge thickener tank then overflows back to equalization tank A for pretreatment. While the 2-way solenoid valve at the sludge thickener tank is energized by the timer, air flows through the 2-way solenoid valve and F/R/L unit to the air diagram Wilden pump to operate. The heavy metal wastewater flows from the bottom of the sludge thickener tank to filter press. 22