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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,