Wastewater treatment from 8 to 30 PE, active sludge

Specifications

This Boralit system is standard conceived of 3 separated tanks. Namely a pre-treatment (primary sedimentation), aeration and a clarifier (secondary sedimentation). All manufactured in high quality PE, a material with multiple advantages.

OPERATION OF AN ACTIF SLUDGE SYSTEM

The small wastewater treatment plants from Boralit working according the active sludge system. The First tank(s) is a pre-treatment tank and functions like a septic tank. The tank in the middle is intensively aerated. In this tank is a mixture of waste water and biomass. This biomass develops in the waste water, in the form of micro-organisms.

In the water treatment plant of Boralit, the aeration is used for both the oxygen supply as for mixing the contents in the reactor. By continuously aerating the installation, the aerobic bacteria are growing.

The separation between the treated water and the activated sludge takes place in the clarifier. A part will be returned to the aeration tank (middle tank). This by means of a sludge return. This increases the purification process significantly. Occasionally the sludge should be removed from the system, so the biomass in the aeration tank is kept at the desired level.

The WZ wastewater treatment plant is based on the active sludge technology, like most central municipal treatment plants.

The WZ is built with 3 tanks. The system consists of first settlement tank (1), aeration tank(2) and final settlement tank (3), and has to be installed underground.

First settlement:

In the first settling tank, the solid particles are stopped and gradually liquefied. Accidental dumping of small amounts of detrimental substances are partially taken care of in this tank.  The biological transformations are done anaëroob (without oxygen).

Aeration tank:

By means of a  bubble aerator oxygen is dissolved into the liquid, which enhances growth of aerobic bacteria. These bacteria will consume the biological waste.

The continuous flow of air bubbles also creates optimal mixing and consumption of the biological waste and enables treatment of waste waters entering the system.

Final settlement :

The third tank is the second settling tank (secondary sedimentation), based on a double final settlement . Here the sludge settles down and from this tank the purified water is discharged from the still water area.  There is no need to add bacteries during the start-up of the system. A sludge return system will return separated sludge to the aeration tank, and will help to bridge periods with limited or no influent (e.g. during vacation period) without negative impact on effluent results  

Designs:
They are available in 8-12 PE, 12-16 PE, 16-22 PE and 22-30 PE.
Consisting of  3 separate tanks.
It is possible to install several systems in parallel.

 Certification:
CE: according to EN 12566-3+A2 2013