Wastewater treatment plant designed to neutralise the pH of the
wastewater prior to discharge to the sewage treatment works. The
production wastewater is first collected in a stainless steel storage
tank, which is equipped with a level control system, a circulation
pump and an overflow pipe. The collection tank serves as a buffer
against fluctuations in pH and volume, and helps to prevent peak loads
in the neutralisation tank. Once a certain level is reached, the
wastewater is fed into the neutralisation tank via a pneumatic
shut-off valve. If the pH value in the neutralisation tank is too
high, the pneumatic valve delays the flow of wastewater. In the
neutralisation tank, the pH value of the wastewater is measured and a
defined quantity of acid or alkali is fed from the chemical dosing
station via ProMinent dosing pumps. A top-entry agitator ensures rapid
mixing. Once a certain level is reached, the wastewater flows on to
the final control tank. There, the pH value is measured again. If it
is within the permitted range, pneumatic valves open and the
wastewater can be conveyed to the sewage treatment plant via two
parallel-connected, alternating wastewater pumps. The flow rate is
measured in the subsequent wastewater pipe. The final control tank is
also equipped with a level measurement system. The system comprises: -
Neutralisation tank with agitator - Final control tank - Collection
tank - Lye tank - Acid tank - Pumps - Valves - Measurement, sensor and
control technology (level measurement, pH measurement, flow
measurement) - Control cabinet, Additional title: Wastewater
pretreatment plant upstream of the sewage treatment works, Capacity:
8500 l/h, Operation / Control: Control cabinet with touch-screen
display / WAGO, Material: Collection tank from stainless steel,
Features: Neutralisation vessel (37 hl); final control vessel (4,5
hl); collection tank; caustic vessel; acid vessel; pumps; process
measurement, instrumentation and control technology; control cabinet
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