Paca Assainissement - Nice - France

Micro-stations – How it works

Operation of individual wastewater treatment plants

Operation of individual treatment plants.

A purification plant is reproduced the microorganisms operation done in nature to increase the quality of water. On the same page we explain how this water treatment will reduce pollution in three phases.

The primary clarifier: Settling wastewater

The system consists of 3 separate compartments (or 3 tanks), the first compartment is a water pretreatment unit. During this phase purification raw sewage effluents (toilets) and gray water (laundry, kitchen,…) undergo a volume stamping and anaerobic fermentation.

Solids (faeces, paper,…) therein in liquefied portion.
Harmful products in small quantities (such as bleach,…) are diluted in it.

The aeration tank: Epuration wastewater

The second compartment is a forced ventilation unit. This purification step tends to transform the pollution load of biomass polluted waters in dissolved mineral salts and carbon dioxide (CO²). All thanks to the combination of oxygen and aerobic bacteria: bacteria feed on pollution and thus continue purifying water.

The oxygen required for the aerobic reaction, is provided by a suppressor and circulated in the tank through the dissemination of a micro perforated tray. The continuous flow of this micro bubble causes vigorous mixing wastewater with aerobic bacteria, treating the pollution of a substantially natural way.

The secondary clarifier: Valuing sewage sludge

The third compartment is a secondary clarifier or settling unit. In this compartment the sludge, the main waste produced by the treatment plant, fall to the bottom of the decanter. Biomass decanted it. This sludge is then removed for proper treatment.

Alive biomass dies slowly from lack of oxygen, forming mineralized sludge that will be removed by periodic oil changes.
A sludge recycling system returns the settled sludge from the clarifier to the aeration tank, ensuring the return of still living bacteria to the aeration tank, and thus more stable operation, good denitrification and better management of sludge.
Biomass is maintained sufficient to ensure decontamination.
Thus the system provides a much more stable operation as well for occasional peaks that during brief power interruptions (holidays) without adversely affecting the quality of the discharge.

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