08-10-2014, 12:06 PM
Abstracts: Screw presses have been used for various industrial applications, including material handling in the content of cattle dung slurry or biomass slurry (sludge) is fed in to overhead screw, which in turn pushes between the screw and a strainer and the water is drained out and the solid waste is collected at the screw thread. This is later dried to produce briskets. The brisket used as a solid fuel and its calorific value is comparable or better than that of any solid fuel like coal, wood, etc. The screw screen has fine perforations towards the end of the screw for collection of the solid, which flow along the outer screen in to the collection dust. Solid enter at one end of the screw, and progressively become dry and dry as it is pushed to the other end. The back-pressure system located just before the discharge point can be varied to adjust the dryness of the extruded solid. Screw presses for oil crushing is quite common and design of manufacturing of a low cost screw press for separation of solid waste from sludge of the biogas plants is a requirement for rural India, in order to produce briskets to be used as fired, which is a good substitute for fire wood. Cutting of trees for fire wood affect the environment and hence to be minimized. In order to understand the process and its parameters, experiments have been conditioned on a hydraulic press to identify the screen considering screen of different hole size. The hole size tested are Ø 2.00mm, 2.5mm, 3.00mm, 3.5mm. And 4.00mm. It has been inferred from these experiments that Ø 3.00mm is the best screen hole size for filtering, with about 40% solid waste being collected.