Sewage materials

EMO offers fully automated solutions for liquid/solid separation during the pre-treatment phase of hydrocleaning trucks, as part of sewer cleaning and street sweeping campaigns.

The main stages of the installation provided by EMO are as follows:

• reception in a pit,
• pickup by grab,
• screening
• mechanical washing to a greater or lesser extent depending on the characteristics of the products to be treated,
• sand washing,
• storage/disposal of cleaned sand.

Recovery by grab

Sewage materials are generally collected by hydrocleaning trucks and sucked directly from manhole covers. They are then transported to a treatment plant where they are poured into a concrete pit to be picked up by a grab.

Trommel screening

The product is then conveyed in a controlled flow to the rotary trommel for screening.
The materials fed into the trommel are separated into two categories:

• Those larger than 10 mm, also known as ‘bulky waste’, are conveyed inside the perforated tube, washed by two spray ramps and removed at the tube outlet by the internal spiral. They are disposed of directly into a tank or by a belt conveyor.
• Those smaller than 10 mm pass through the perforations in the perforated tube and fall into a tank to be collected by a transfer pump..

Sand treatment

Fine materials (OM + sand) are collected by a pump along with the wash water from the trommel and transferred to the sand washer, which separates and extracts organic matter and sand.

The latter are squeezed out and evacuated using a transfer screw. The washwater, which contains fine organic particles, can be filtered before being discharged into the conventional wastewater treatment system. These pieces of equipment are adapted to each other according to the required treatment flow rate.