Newster® Safe Water Treatment (SWT) system for the disinfection of hospital waste water. It has been specially designed as final mechanical treatment of waste water deriving from infectious-disease hospital wards.
Newster Safe Water Treatment Technology
Newster SWT is a system for the disinfection of hospital waste water. It has been specially designed as final mechanical treatment of waste water deriving from infectious disease hospital wards. The system is based on an innovative process that uses a special grinder to dispel all organic material and eventually grinds all other material in the waste water.
On-site Safe Water Treatment
The Newster® SWT system is designed for on-site installation in hospital facilities. It meets the needs of small-sized hospitals and hospitals located far from main urban areas, lacking connection to sewage system and urban water treatment plant. SWT is a Newster® technology designed to complete the range of Newster® products providing a complete solution for hospital eco-sustainability.
Newster® SWT Cycle Process
The automatic cycle carries out the following stages:
- Grinding of solids contained in sewage water
- Solid-liquid separation
- Disinfection of infected liquids and final drainage to sewer
Grinding of Solids
Dissipation and grinding operations of the solids during treatment take place in the grinding tank where the grinders and the transfer pumps are installed. This phase of the grinding disintegrates the organic matter and reduces the size of solid and fibre matter when the wastewater is pumped to the separator. Heavier materials that might be present (stones, pieces of iron, glass, etc) sediment in an area far from the grinder, due to the centrifuge effect.
Grinders and pumps are controlled by the computer through a system of level probes. The tank has a safety overflow drain that, in case of emergency, drains the water into the disinfection tank and then directly into the sewer.
During this phase the liquid passes through a mechanical filtration stage where solids are compacted. This stage of the treatment takes place on a stainless steel sheet with 5 mm diameter holes. The perforated sheet is continuously cleaned by four nylon brushes. During this stage solids are pressed by two rotating rollers, mounted on special elements that allow the regulation of the force of the pressure. In this way the solid is squeezed and then loaded into the container 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 by means of the transfer pumps with an open impeller pump for wastewater. Where possible the transfer is made by fall.
The separated solids are taken from the separator and piled into the container . They may be treated in the Newster® NW solid waste sterilisation machines.
Disinfection of infected liquids and final drainage to sewer
The disinfection tank is designed to mix the waste water and disinfectants correctly. 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 , 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.
The disinfection tank is designed in order to guarantee a contact time of 30 minutes between the disinfectant agents and the wastewater (peracetic acid requires a minimum contact of 20 minutes in order to disinfect the wastewater).
At the end of the treatment the wastewater is discharged into the sewer.
The system is designed with two redundant work lines.
The technical specifications are intended for a single line.
NEWSTER SWT TECHNICAL SPECIFICATIONS
- Maximum Capacity
- Total Power Used
- Grinding Tank
- Electric Board
- Transfer Pump, Centrifugal Model
- Vertical Axis Submersible Grinder
Capacity: 10 m³ per hour
Motor Power: 4 x 1.1 kW
Treatment capacity: 10 m³ per hour
Motor power: 2 x 5.5 kW
Max. diameter ground solids: 10mm
Blade material: Special metal alloy