A screen that pays off: The nrw contec screen
Install, power up, forget.
For years, sewage treatment plant operators worldwide have relied on nrw contec screens to solve their wastewater problems. Just as numerous industrial companies have their process or cooling water cleaned by the clever screen.
It is the mix of stability, simplicity and low-wear design that makes a nrw contec screen so durable.
A nrw contec screen is quickly installed, reliable and economical in every respect. The principle of the nrw contec screen has proven itself for almost 100 years and is continuously improved by us.
Your advantages at a glance:
Top separating ridge
Due to its mode of operation, a nrw contec screen easily achieves a particularly high degree of separation of screenings in the form of floating, sinking, suspended and fibrous materials.
Little space required
nrw contec screens are compact. Particularly in smaller rooms, the screen scores points thanks to its optimum ratio of screen area to size.
Little rinse water
nrw contec screens usually only need cleaning water for 1 – 2 minutes every 4 hours. And very little of that. Or none at all: The screen also runs without a cleaning device.
You want a cleaning facility? In terms of operating pressure, a nrw contec screen is satisfied with only 2 – 3 bar.
Does not smell
For a pleasant working environment around a nrw contec screen, all screens are equipped with a complete hygienic encapsulation. An exhaust air pipe connection is also easily made.
Monitoring-free continuous operation: Thanks to its robust design, a nrw contec screen rarely requires maintenance. Service lives of up to 20,000 operating hours are not uncommon.
You do not have to build your plant around our screen. We build the screen to fit you. In addition, you always receive a nrw contec screen ready for use. On-site assembly is usually not required.
Sure, a neat looking screaning system is appreciated. A nrw contec screen still cleans reliably even if it has not been cleaned for a long period of time.
Only the adjustable brushes come into contact with the medium to be removed. Ball bearings, shafts and seals are located above the zones in contact with the medium.
Particularly energy-saving thanks to low drive power. Depending on the application and design, nrw contec screens consume only between 0.45 and 5 watts per cubic metre of treated wastewater.
Easily adjustable brushes last up to several 10,000 hours of operation. Leakages due to worn seals between the frame and rotating screens or screen drums are not known to nrw contec screen.
How screenings simply fall by the wayside
How a nrw contec screen masters water purification
The function of the well-tried nrw contec screen is simple:
The horizontally flowing waste water first reaches the semicircular perforated screen plate, which retains the screenings.
Slowly rotating brushes reliably convey the screenings over the edge of the perforated screen plate into the lateral screenings discharge.
At the same time, the water cleaned in this way “falls” freely downwards from the perforated screen into the outlet. In this way, the screen ensures an exceptionally high degree of separation of solids and, in particular, fibres.
This proven method has remained unchanged in principle since its invention.
Areas of application wastewater treatment plant
Mechanical waste water pre-treatment
In wastewater treatment, nrw contec screens reliably remove coarse organic material such as beverage cans, crown caps, hygiene articles and plastics. Depending on the sieve size, also hairs and fibrous materials.
Pre-cleaning for membrane sewage treatment plants
For pre-filtration upstream of modern membrane bioreactors, nrw contec screens are used as fine screens, ultra-fine screens or combined screens.
Fields of industrial application
For industrial wastewater treatment, nrw contec screens remove the impurities carried in industrial wastewater, such as wood, glass, metal parts, grain residues, fibres and hair from slaughterhouse wastewater and other inorganic impurities.
Treatment of process or cooling water
When treating process or cooling water, the screen removes fine particles and floating matter.
nrw contec screens are also suitable for river water extraction.
Withdrawal of river water
For river water extraction, the nrw contec screen is mounted on the river bank. Here it reliably prevents the cooling water or extinguishing water pump from sucking in leaves, branches, fish, fish lichen and other floating matter.
In these industries clean nrw contec screens
Municipal wastewater treatment plants
Cooling water withdrawal
animal body recycling
Zoo / Animal Park
Popular and well-tried. For almost 100 years
1,298 contec screens
The 1,298th contec screen is in operation
Protection for a NEREDA
The first larger nrw contec screen are used to protect a NEREDA® in the Netherlands.
Development of the low pressure cleaning system
The low-pressure cleaning system for nrw contec screen is developed jointly with RWTH Aachen University and ZENON GmbH and goes into series production.
The first contec screen is used speed-controlled for the retention of paper fibres in the paper industry.
1. counter current system
For the retention and removal of leaves, branches and also smaller construction logs in the river water, the first contec counterflow screen with a total throughput of 3,000 litres/second (259 million litres day) is installed in Cologne.
First contec screen for the protection of a membrane system
After a successful test run, the 1st nrw contec screen is installed to protect a membrane plant.
Combined heat and power plant uses contec screen as circulation screen
Even today, it reliably ensures the cleaning of the entire cooling water.
The contec screen inspires
With it, resourceful designers consistently develop the first series further. For the first time, wastewater throughputs of up to 1700m³/h (40 MLD) are realized.
Sales in the context of technical environmental protection
The first screen of this type are marketed as part of a business area that was still largely unknown in Germany at the time, technical environmental protection. And gradually experience the first optimizations for the German market.
The 1st contec screen of its kind
Driven by a water wheel
Even at that time, the recovery of recyclable materials from wastewater was based on both economic and ecological considerations. The Robert Clough Ltd. textile mill in the county of West Yorkshire in the north of England is the first to use a contec screen that recovers sheep’s wool fibers from the mill’s own dyeing wastewater. Driven by a water wheel.