| Abstract |
| Cylinder-type screw press has been widely applied to the solid-liquid separator of livestock manure, while taper-type screw press has not yet. The purpose of this study is to evaluate the possibility of pre-treatment of livestock manure using taper-type screw press. A new taper-type screw press was designed and applied to the field test in pig farms and dairy farms. The experimental results for the solid-liquid separation of livestock manure using a taper-type screw press showed that the dewatering efficiency increased compared to the conventional cylinder-type screw press. The water content of the dewatered solids was indicated to be 70∼75% for cylinder-type solid-liquid sparator and 65∼68% for cylinder-type solid-liquid separator. The taper-type screw press(round 1.5mm) exhibited that a large amount of solids was discharged in the separated liquid, resulting from the fact that the size of its screen opening was larger than that of cylinder-type screw(slot 0.5mm). The SS concentrations in the separated liquid were observed to be 20,000∼40,000ppm for cylinder-type screw press and 30,000∼50,000ppm for taper-type screw press. The taper-type solid-liquid separator has benefit in the view of solids recycling in the way that it could decrease the water content of dewatered solids while it has also disadvantage in the view of recycling and disposal of the separated liquid. |
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| Key Words |
| Solid-liquid separator, Screw press, Livestock manure, Pretreatment, Compost |
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