decanter,centrifuge

NOXON Decanter Centrifuges result in substantial volume reduction in both the industrial and municipal applications. Among the many types of sludge that advantageously can be dewatered you will find: raw sludge, biological sludge, digested sludge, waterworks sludge, slaughterhouse sludge, paper/cellulose sludge, fish sludge, oil sludge etc. Our centrifuge is compact and low maintenance. The NOXON decanter centrifuge requires only a small amount of space in comparison with chamber filter presses and belt presses. This results in lower building costs and investment costs. NOXON Decanter Centrifuges are available in a number of different sizes and they can be adapted to suit customer requirements. Customer requirements may include demands on the materials used, the height of the foundation, the operating system or the color. NOXON Decanter Centrifuges for sludge dewatering will remain reliable and functional year after year. The NOXON decanter centrifuge makes it possible to meet more stringent environmental demands as well as reducing operating costs. How a decanter centrifuge works: The central part of the machine is a rotating drum, which contains an independently rotating screw. The sludge is fed via the inlet pipe to the mixing chamber in the "core" of the first part of the screw, which is where polymer is added to make the sludge flocculate. The sludge then passes through ports in the mixing chamber out towards the outer walls of the drum. The dewatered sludge is transported out through the machine by the screw. The centrate (or supernatant) is decanted from the inner surface of the pond through centrate pipes. The water level (or pond depth) in the drum can be adjusted in accordance with the characteristics of the material to be processed. The drum and the screw rotate independently of one another at up to 3,600 rpm, depending on the type of machine and the type of sludge. The dewatering principles used are known as the "concurrent" or "counter-current" method. The concurrent method permits extremely low differential speeds. The differential speed is the difference between the speed of the drum and the speed of the screw. Low differential speeds mean longer residence times in the centrifuge, which result in drier sludge and considerably less wear. The counter-current principle is more suitable for a sludge that is easy to dewater and when a high capacity is desired.

Polymer System

This equipment can be controlled by our sludge computer SP3000. The polymer machine can be delivered with a separate power cabinet. NOXONs polymer machine is of the “continuous-in-batches” type. This means that the mixing begins at the start level in section I (around 200 mm below the stop level). Since all the sections of the tank are linked, the polymer suspension can be withdrawn continuously from section III. The two sections of the tank with a “rest zone” between them means that the polymer is mixed thoroughly with the water to create a very homogenous suspension and long residence time. The polymer is mixed with water via a cylindrical water curtain. The suspension is then pumped up into the mixing tank, section I. We measure the water flow to the blender and have a frequency converter on the dosage screw, which provides a constant concentration in the polymer suspension. There are a number of alarms on the blender to ensure that everything functions correctly. The pump makes it feasible to have the blender unit and the tank unit separated from each other. The blender can also be supplied in big sack design. We can deliver the polymer machine with a dust protection system to prevent polymer dust from spreading in the facility. The polymer machine can also be used for liquid polymer if a dosage pump is installed.

sludge processor

Connecting NOXONs SP3000 Sludge Regulator to our decanter centrifuge will enable you to control the sludge dewatering process as safely as possible. Our sludge regulator can control several functions all at once. The following processes can be controlled/managed: ¡ Regulation ¡ Recording ¡ Monitoring Your centrifuge can be allowed to operate unmanned 24 hrs a day since the sludge regulator continuously monitors. Should anything unexpected happen, our sludge regulator has alarm functions that can stop and flush your centrifuge. The SP3000 is an advanced industrial computer, which has been adapted for sludge dewatering. This computer is equipped with software that has been specially designed to meet the demands of the NOXON centrifuge. User-friendly Monitoring the process has been simplified with the large sludge regulator monitor. This graphically shows what is happening during operation, and the monitor display is updated continuously. If the operator requires further information, he can use the cursor to choose desired function. Statistics or trend curves can be displayed on screen, and the operator can analyse the process for the day/week by means of these. The regulator also indicates when a service is necessary, depending on the operating time. All NOXON control panels are equipped with a modem to enable full support and the possibility of troubleshooting and updating. It is also possible to contact a network via an Internet connection. The sludge regulator can communicate with the superior system. Communication is done via Modbus ASCII + RTU or COMLI. With a converter we are also able to use Profibus DP. The combination of a NOXON Decanter Centrifuge and an SP3000 will give you maximum control over your sludge dewatering process. Your sludge will be drier and your handling costs will decrease.

Vibration sensor

The vibration sensor monitors the balance of the machine. If the vibration exceeds 25mm/s² the computer will sound an alarm. A wide range of accessories are available for our centrifuges. These make it possible to adapt the machine to your own requirements. The accessories include different types of equipment: ¡ Control Panels ¡ Sludge regulators ¡ Vibration sensors ¡ Sludge diverters ¡ Sludge outlets ¡ Stubs for ventilation ¡ Flow meters ¡ Sludge density meters ¡ Centrate turbidity meters ¡ Centrate sampling vessel ¡ Level indicators ¡ Acoustic covers ¡ and several types of mixer for polymer. Please contact us and we will be happy to advise you on what equipment that is suitable for your machine. We also offer the following: ¡ Training ¡ Commissioning ¡ Optimising ¡ Mounting