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Owner’s manual

Page 3/14

20220816

Phosphorus removal unit (DpEC)

Item # 339921

1.1.

Primary reactor

The untreated wastewater first makes its way from the dwelling to the primary reactor. The primary reactor plays the triple role of
clarifying the wastewater by letting suspended solids settle to the bottom and retaining floating matter to prevent premature clogging of
the system, regulating effluent flow discharged in the EC unit, serving as a holding tank for the returning sludge from the EC unit. The
primary reactor is equipped with a flow regulating device in its outlet designed to float atop the retention volume water level to allow a
constant outflow to be discharged by gravity into the EC unit and available in both concrete and polyethylene option.

1.2.

EC unit

The EC unit is divided into two distinct zones. The reaction zone (where the aluminium electrodes are located) and the separation
zone (where the lamella separator is located). The reaction zone is characterized by a turbulent regime, whereas the separation zone
is operated by a decanting regime. Independence between the two different regimes is ensured by the non water-tight divider baffle.
The separation zone is equipped with a lamella separator and a sludge pump that periodically returns the sludge to the primary
reactor.

1.2.1

Reaction zone

The main components of the reaction zone are:

•

Two pairs of electrified aluminium electrodes (anode and cathode), each housed in a screen-mesh cage that allows free water
circulation while containing the self-cleaning media around the electrodes. During system operation, the wastewater is mixed with
aluminium particles freed from the electrodes. The aluminium-charged effluent from the reaction zone then transfers freely to the

separation zone.

•

The cleaning of the electrodes’ surfaces relies on an anti-passivation system. Biomass and oxide films that tend to form on the
surfaces are continuously cleaned, allowing the electrodes to continue to operate. This anti-passivation system is composed of an
agitating pump connected to a series of manifolds. Eductors are mounted to each manifold, optimizing the turbulence in the
chamber and giving the self-cleaning media sufficient velocity to dislodge all biomass on the electrode’s surface.

1.2.2

Separation zone

The main components of the separation zone are:

•

A lamella separator with an equivalent capacity to that of a regular separating tank of 3 m

. This technology allows a single tank to

be used to accomplish both treatment steps of electrocoagulation and separation, thus reducing the size of the installation. To be
discharged, the effluent from the EC unit must go through the lamella separator from the bottom up, abandoning on its way flocs
and residues on the lamellae. The separated effluent is then collected in a gutter at the top of the separator and then discharged to
the treatment system downstream.

•

A second pump, located under the lamella separator, is programmed to return the sludge to the primary reactor at fixed-time
intervals.

Number of bedrooms

Maximum daily

flow (L/d)

Polyethylene

Primary reactor

Concrete Primary

reactor

Phosphorus removal

number of units

540