Sludge generation is an important part of the water and wastewater treatment process, since inadequate sludge handling system can lead to serious environmental problems.
Liquid sludge can be easily thickened and reduced to a solid cake via sludge thickening or dewatering. This reduces the volume of liquid sludge significantly, usually resulting in quite a substantial net saving in sludge disposal costs.
Different technologies need to be applied in different implementations, as the properties of liquid sludge vary from instance to instance, with projects for municipalities and solutions for industries requiring different systems. The sludge can be organic or inorganic as a consequence of the treatment process and each of these sludge varieties needs specific handling before they are made fit for disposal. Environmental requirements vary on a client by client basis, and Dewaco is able to provide sludge removal solution that works for each of them.
As a sludge treatment specialist DEWACO LTD has developed various concepts for different sludge thickening and dewatering applications. With over 1000 installations, DEWA offers a full range of thickening and dewatering equipment that provides superior performance, mechanical reliability, product life, and features.
Current trends clearly illustrate that the demand for mechanical dewatering equipment is increasing. More and more consultants and experts are specifying gravity belt thickeners and belt filter presses over other dewatering equipment due to their excellent performance records. As a company well experienced in the field of sludge treatment, DWT always strives to remain a forerunner in this field.
DEWA FPD is available with various configurations i.e. Filtrate recycling system, manual/automatic brush pipe, inline polymer injection, sludge level probes, hydraulic type belt tracking and tensioning system and local PLC control panel suitable for Audio/Manual operation with provision for interlocking with accessories.
DEWACO provides the following Sludge Thickening and Dewatering technologies:
An extra large gravity zone provides effective thickening even at high flow rates. A specially designed ploughs enable to open and turn the sludge mat and allow penetrating excess water from the gravity zone. Transverse support beams, which are located underneath the filter cloth, provide a slight downward pressure for improved water removal and prevent formation of surface tension.
Sophisticated and effective sludge thickening (as a separate thickening unit)
The DEWA BTN Heavy Duty Gravity Belt Thickener is a total enclosed unit designed to increase the solid content of the sludge considerably the monocoque design feature enables odour containment within the unit simplifying odour extraction by the vent pipe mount on top cover. This revolutionary design concept offers a clean, odour-free and operator friendly environment.
Wedge dewatering zone uses the gravitation force to reduce the volume of the sludge in preparing for pressing. Transverse support beams, which are located underneath the filter cloth, provide a slight downward pressure for improved water removal and prevent formation of surface tension. In the low-pressure zone, the sludge is passing through large perforated drum (s), specially drilled roll that aids filtrate removal. In addition, sludge is directed to liner pressure as it is conveyed in between the upper and lower belts.
In order to obtain maximum cake dryness, the DEWA FPD multi-stage has been designed with several roller arrangements possibilities. With additional rollers and modified belt path, the total exposure time of the cake can be extended considerably.
The monocoque construction of the DEWA belt filter press enables to contain the odour within the machine, so it is rather easy to extract from the eduction pipe which is located in the upper cover of the belt filter press. This revolutionary design concept creates clean and odour-free working environment.
The optional discharge conveyor(s) can be configured to suit the installation requirements, and the discharge height and location can be modified . Distribution conveyors are also available to provide multiple discharge locations in a roll off bin or truck.
Skid mounting saves time and money during installation. An inbuilt drain pan (filtrate tray) is provided to allow all filtrate water to discharge at a single point.
FPD multi-stage dewaterer is easy to modify according to characteristics of the sludge as well as throughput and cake solids requirements. This compact and odoura free unit is also the most convenient solution where space is at a premium.