Wastewater treatment and sludge dehydration

The wastewater coming from the washing of contaminated products, or simply full of mud,
must be cleaned before being sent to the disposal systems or being reused in the washing process.
The wastewater treatment systems, which we design, manufacture and install, are of a chemical-physical type.
Their configuration depends largely on the type of effluent to be treated.
Below is a scheme adopted for the depuration of cullet washing water.

Sediment trap - oil separator

The pre-treatment of wastewater cleaning consists in sand removal and de-oiling.
In a tank, suitably configured with vertical separation baffles,
the sand is separated by decantation while oil and fat are separated by flotation.
This equipment is called sediment trap and oil separator.
An overflow at the top eliminates the oils and fats,
while the sands are lifted from the bottom of the tank with the aid of a compressed air stream.

Water conditioning and flocculation unit

Polyelectrolyte and other additives, required for the formation of sludge flakes, are prepared in suitable equipment,
and then are added by means of metering pumps, to the continuous flow of wastewaters.

reattori di flocculazione e preparazione del polielettrolita

Clarifiers

We design, build and install both horizontal clarifiers with a scraper, and vertical static clarifiers.
There are no specific reasons for preferring one to the other because the choice depends greatly on the water levels in the plant and the available space.
The sludge is concentrated on the bottom of the clarifier,
while the clarified water flows back upwards to the effluent weir, ready to be reused in the industrial process or to be sent to a disposal system.
A pump evacuates the sludge and sends it to the homogenizing tank for subsequent dehydration.

Chiarificatore orizzontale con raschiatore

Sludge dehydration unit

The thickened and homogenized sludge is sent to the filter press.
The choice of the filter press is made by taking into account the quantity of sludge produced by the clarification unit
and by the characteristics of mud, namely, the amount of organic matter, what sand or abrasive material it contains,
how adhesive it is to the filtration canvases etc.
Before choosing a dehydrating machine, we carry out some filtration stests,
usually together with the machine manufacturers, in order to assess the type of filtration canvas to be used and filtration time.
For some types of sludge it is possible to employ dehydration units of a centrifugal kind, instead of the filter press.