Summarization of Responses to Questionnaire Sent to Member Companies Concerning the Performance and Functions of Various Types of Water Removing Device for Slndges (II)

Abstract

The pulp and paper industry employ a variety of dewatering means for the waste sludge treatment. While the means of a centrifugal type had been prevalent until around 1973, increaging number of the pressure type means, of which a screw press is dominant, have come to be used since then for both primary and secondary dewatering. This increase reflects lower power requirements and higher dewatering efficiency of screwpress.
This report reviews operational performance of various types of sludge dewatering means. The industry require ever improved sludge dewatering system to attain;
(1) reduction in fuel costs for burning sludge,
(2) reduction in sludge handling costs for landfills, and
(3) unilization of sludge as a compost or other manures.