Traditional method for sewage water purification by means of an activated silt suspension includes delivery of sewage water in a equalizing reservoir and consequent its re-pumping to an activation reservoir, the supply of purified water to the secondary settling tank, and the removal of residual silt through a discharge port after the settlement.

In the newly-developed technology, when sewage water level in the equalizing reservoir drops below the preset minimal value, the activation process is automatically terminated and an excessive amount of silt or a silt containing dirty water is pumped from the activation reservoir to the equalizing reservoir until the sewage water level in the equalizing reservoir hasn’t been restored and attained the preset operation level. After that, the process of pumping-off silt from the activation reservoir is terminated and the activation process is restored.

In the second modification of the newly-developed method, after termination of the activation process excessive silt is pumped with a certain time delay taken in the range of 30 to 90 minutes.

Typical activation installation for biological sewage water purification by means of activated silt suspension comprises a equalizing reservoir, with sewage water delivery system and a pump to supply raw water from the equalizing reservoir to the activation reservoir. Air is injected to the activation reservoir and then rejected to the secondary settling tank equipped with a pump to discharge silt from the secondary settling tank to the activation reservoir, and a discharge port. In the newly-designed installation, a floating switch activated by minimal and operation level of sewage water is placed in the equalizing reservoir. The switch ensures the termination of the activation process and turns on the pump to discharge silt from the activation reservoir to the equalizing reservoir or turns off the said pump to restore the activation process when the sewage water operation level in the equalizing reservoir has been reached.

Topol J.

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