الفهرس | Only 14 pages are availabe for public view |
Abstract Sludge dewatering process is crucial step in the cost-effective management of wastewater residuals treatment. The belt filter press is one of the dominant mechanical sludge-dewatering technologies available. The expense of conditioning chemicals may in some instances be as high as 20% of the total treatment plant operation costs. Polymer is the most common conditioning chemical used for belt filter presses. Other chemicals, such as ferric chloride and lime have been used also. Another belt filter press operating cost is belt fabric. The belt fabric characteristics are representing an important factor affects belt filter press performance. The objective of the present study is to investigate the applicability of a cost- effective local material for sludge conditioning. Another objective is to study the suitability of use local material textile as belt fabric. Cement dust consists of more than 50% by mass of lime; therefore cement dust as a low cost product was tested as sludge conditioner instead of the costly polymers. Investigated belt fabric was weaved with polyester multifilament yams, and with permeability value 0.04 cm/sec and ultimate tensile strength value 117.21kN/m. A bench scale model simulating the two stages of the belt filter press namely, gravity drainage stage, and compression stage was constructed. The model was fed with secondary activated thickened sludge. The study examined different cement dust adding forms, different cement dust doses, and conditioner preparation mixing time, speed, and cement dust percent. In addition, the effects of belt loading rate, sludge/conditioner contact time, |