The Application of Screw Press Dewatering in Livestock Farms

 

The Application of screw press Dewatering in Livestock Farms

The working principle of screw press dewatering can be divided into three parts: concentration, dehydration, and self-cleaning. In the concentration section, when the spiral drive shaft rotates, the multiple solid and active laminations located on the outer periphery of the drive shaft move relative to each other. Under the action of gravity, water is filtered out from the gaps between the relative moving laminations, achieving rapid concentration. In the dewatering section, the concentrated sludge moves forward continuously with the rotation of the spiral shaft. Along the direction of the sludge cake outlet, the pitch of the spiral shaft gradually decreases, and the gap between rings also gradually decreases. The volume of the spiral chamber continues to shrink. Under the action of the back pressure plate at the outlet, the internal pressure gradually increases. With the continuous operation of the spiral pushing shaft, the water in the sludge is squeezed and discharged, and the solid content of the filter cake continues to increase, ultimately achieving continuous dewatering of the sludge. The self-cleaning part is driven by the rotation of the spiral shaft, which continuously rotates the moving ring. The equipment relies on the movement between the fixed ring and the moving ring to achieve a continuous self-cleaning process, thus cleverly avoiding the common problem of blockage in traditional dehydrators.

The product advantages of screw press dewatering include wide applicability, strong cleaning ability, environmentally friendly odor and noise free, small size, energy saving and environmental protection. Its market size has grown at an average annual rate of over 10% in the past five years, mainly due to the government's emphasis on environmental protection and the increasing demand for industrial wastewater treatment. Market trends show that the market for stacked screw sludge dewatering machines is constantly undergoing technological innovation and improvement. The new generation of stacked screw sludge dewatering machines adopts more efficient separation technology, which can improve dewatering efficiency, reduce energy consumption and maintenance costs.

In practical applications, screw press dewatering can directly treat sludge in aeration tanks or secondary sedimentation tanks without the need for sludge concentration tanks and storage tanks, saving land. It can also enhance the phosphorus removal function of the system, dehydrate sludge under aerobic conditions, avoid phosphorus release from sludge under anaerobic or anoxic conditions, and improve the phosphorus removal function of the system. Simple operation management, no filter cloth, filter holes or other easily clogged components, safe and simple operation. Combined with a fully automatic dosing system, it can achieve 24-hour unmanned operation.

Screw press dewatering has shown excellent performance in treating wastewater from pig farms. Due to the high viscosity and strong organic properties of pig farm sludge, screw press dewatering can efficiently dehydrate sludge, occupying a small area and saving energy and reducing emissions. When treating untreated pig farm wastewater, the sludge treated by screw press dewatering has a moisture content of 80% -85% and a slightly yellow filtrate, which meets the third level discharge standard. If the wastewater from pig farms is treated by biochemical processes, the sludge treated by screw press dewatering has the same moisture content, but the filtrate is close to the state of clean water, which can meet the first level discharge standard, and can be directly discharged into lakes and rivers in the future.

The dosage of screw press dewatering depends on the properties and treatment requirements of the wastewater. Generally, 0.5-1 kg of flocculant needs to be added per ton of wastewater. The basic operations include opening the water inlet to introduce sewage, starting the equipment, regularly checking the working status, and closing the water inlet and stopping the operation after the treatment is completed. When adding medication, attention should be paid to controlling the dosage, selecting suitable coagulants, and regularly cleaning and maintaining the equipment.

 

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