Eco-sustainable technology for
the processing of healthcare waste (HCW),
on-site or in centralized treatment centers.

Hospital Sewage Water Treatment Process




THE NEWSTER SWT CYCLE PROCESS

The automatic cycle carries out the following stages :

Fluidification of liquids
Solid-liquid separation
Disinfection of infected liquids and final drainage to sewer


Fluidification of liquids

Dissipation and grinding operations of the solids in treatment take place  in the grinding tank (3) where the  grinders (4) and the transfer pumps (5)  for the water containing the grinded solids are installed.
This  phase of the grinding  disintegrates and disperses the organic matter and reduces the size of solid and fiber materials after which the waste water is pumped to the separator (6). Heavier materials that eventually are present ( stones, pieces of iron, glass, etc) are removed  by the centrifuge effect of the rotating head of the grinder and deposited in an area where it can not damage the grinder.
The computer, via a system of level probes, commands the grinders and pumps. The tank has a safety overflow  system that drains the water into the disinfection tank and then directly into the sewer.


Solid-liquid separation

During this phase the liquid passes through mechanical filtration twice while solids remain compacted

The first stage of the treatment is formed by a stainless steel sheet  with 8mm diameter holes. The perforated sheet is continuously  cleaned by four nylon brushes. During this stage solids are pressed and sent to the second stage.
Even in the second stage the grill is a stainless steel sheet with 8mm diameter holes.

The solids arriving from the first stage are pressed against the perforated sheet by four rotating rollers, mounted on special elements that allow the regulation of the force of the pressure. That way the solid is partly dewatered first and then loaded into the container (7)  with the use of two nylon brushes that brush  the perforated sheet. The liquid is collected in the separator’s lower tank and from there transferred to the disinfection tank (9)  by means of the transfer pumps with open impeller for wastewater (8) Where possible the transfer is made by drop.
The solids separated are taken from the separator and piled into the container (7). They can be treated in the Newster® NW solid waste sterilization machines.

Disinfection of infected liquids and final drainage to sewer

The disinfection tank  (9) is designed to obtain the right degree of mixing between the wastewater and the disinfectants.
The dosage of the chemical additives is controlled by chemical and physical parameters linked to the computer that controls the function of the entire system.
The peracetic acid (10), used mainly as a disinfectant, creates an acid environment in the disinfection tank. To maintain a pH value of about 7 a basic product is used, usually sodium Hydroxide (11).
The disinfection tank is designed in order to guaranty a contact time of 30 minutes between the disinfectant agents and the wastewater ( with peracetic acid a minimum contact of 20 minutes guarantees the disinfection of the wastewater). When the time is up the wastewater is discharged into the sewer (12).

Technical Specifications
The system is designed with two redundant work lines.
The technical specifications are intended for a single line.

WHY TO CHOOSE NEWSTER SWT

  •     Proven excellence in hospital sanitation
  •     Newster®SWT is a barrier against the infection of underground and surface water
  •     Certification proving conformity with CE regulations
  •     Newster®SWT is pre-assemled and can be installed without any structural work. It is deliverable in containers
  •     Newster®SWT is easily maintained and an operator is not necessary while it is in function
  •     Newster®SWT is completely automatic and computerized
  •     Newster®SWT is equipped with a remote control system
  •     Newster ®SWT is endowed with two redundant work lines


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