Transcend Cleantec Private Limited has pioneered the technique of manufacturing Multi Disc Screw Press in India
These Sludge Dewatering Press are intended for mechanical dewatering of community and industrial wastewater sludge. They are recommended for wastewater sludge (Multi disc) dewatering on low-capacity municipal wastewater facilities, as well as for food, pulp-and-paper, and textile, chemical, oil-refining and similar industries.
These Sludge Dewatering Press are efficiently used for fabrication rates of up to 1000 kg/hr – dry solid mass.
At the operating efficiency, these dehydrators are a good alternative to traditional dewatering equipment. It provides dewatered sludge with a moisture content of less than 80% in conditions of classic wastewater treatment plants.
These dehydrators are intended for utilized in wastewater sludge with a PН of 6.0 – 9.0.
The Multi-Disc Screw Press is a robust machine designed for reliability, consistency and continuous operation. The machine can be fed with sludge directly from the dewatering and oxidation pit eliminating the thickening tank and the sludge storage tank. The machine incorporates multiple processes all in one single continuous operation. The brief process is as below
1. FLOCCULANT PREPARATION
The flocculant is prepared in the flocculant preparation tanks at the recommended concentration
Polymer flocculant is added in the flocculation tank filled with sludge. Efficient agitation ensures fast agglomeration and flocculation of the suspended particles into large flocks that can be separated
The flocks are transported through the thickening zone onto the dewatering zone. A series of fixed and moving rings filters the water as the sludge moves to the dewatering zone. The filtered water flows down through the rings to the filtered water tank below.
The sludge is transported from the thickening zone to the dewatering zone by the screw conveyor. The spiral conveyor in the screw cylinder is specially designed to move the sludge forward efficiently while gradually compressing them by pushing the sludge against the back plate. As the sludge is compressed, most of the water is squeezed out of the sludge. The squeezed out water from the sludge is filtered by the series of fixed and moving rings. Clear water flows to the filtered water tank below. The dewatered sludge exits from the outlet at the top and falls down. The constant rotation of the screw ensures the sludge is pushed forward, thickened, dewatered and exited while filtering the water, all at the same time
5. DRYNESS & DISCHARGE CONTROL
The sludge cake dryness can be adjusted by the adjustable end plate. The end plate adjustment enables control of the cake dryness and the rate of output from the sludge exit port. This is provided to handle sludge with varying viscosities.
The conventional sludge dewatering systems like centrifuges, Belt press, Filter press (Plate & Frame type) have many draw backs. The drawbacks include
• Large foot print,
• High power consumption
• High Operational cost / consumables
• Frequent breakdown
• Non-continuous (batch) operation
• High maintenance requirement
• Multiple Pretreatment
• High labor
As the Multi-Disc Screw Press can take the load directly from the oxidation ditch, considerable capital cost, construction costs and maintenance cost can be avoided
DIRECT DEWATERING FROM OXIDATION DITCH
Feed sludge directly from the oxidation ditch / aeration tank. This eliminates the need to construct settling tanks, sludge thickener or sludge feed tanks. This advantage leads to a good reduction in CAPEX as well as OPEX.
CLOG FREE DESIGN
The series of heavy duty finely machined fixed and rotating rings placed alternately provides efficient filtration that remains clog free due to the continuous movement of the rings. This eliminates the need for consumables like filter cloth etc
The system can be fully automatic with PLC controls. Option of variable frequency drive (VFD) is available to control the dosing and the screw speed to automatically adjust to the varying loads of the effluent. The system can run continously, unmanned.
The system can take sludge directly. This eliminates the need to build sludge thickening tank and sludge storage tank, thereby saving on space and civil construction costs.
Since both the sludge thickening tank and the sludge storage tank is eliminated and as sludge is not stored for long periods of time, there is no anaerobic process happening. This eliminates the possibility of unpleasant odour.
HANDLES OILY SLUDGE
Due to the rotation of the helical axis, the moving rings detach from the fixed rings while continuous- ly cleaning itself. As a result clogging is avoided. Therefore it can easily handle oily sludge.
The system works on its internal pressure. It saves energy due to its low running speeds (2-4 rpm). The average power consumption is only 0.01 – 0.1 kw/h which is 12% of a belt press and 5% of a centrifuge
The Transcend Cleantec Screw Press takes the least space among other technologies. Its approximately 45% less space than Centrifuge, 62% less space than Belt Press and 78% less space than Filter Press of conventional design.
CAPACITY & SCALABILITY
Transcend Cleantec Multi Disc Screw Press is designed to cater to various capacities. Systems are available from 0.2 m3/hr – 133.5 m3/hr (@0.2%sludge conc.) Due to its modular design and compact construction, the capacities can be easily scaled up by running systems in parallel to cater to almost any capacity as required and as and when required. We can also optimize the design for cost and efficiency based on your custom requirement using the standard models.
INSTALLATION, SERVICE SUPPORT & TRAINING
Our experienced and trained team of engineers help you with the installation and operator training.
Our systems are designed to be a work horse and run for years without needing any service. But there are odd chances that you may need service support. Our trained technicians are an email or call away. With adequate training and spares at their disposal, they will ensure the system is up and running in a very short time.