Abstract
This paper deals with an examination on a conceptual approach on optimum paths of sludge management. The contents are as follows: 1) A sewage treatment system as viewed from environmental system is presented for examining optimum paths of sludge management. 2) An analysis of cumulative proportion curve with respect to quantity of separated liquid is proposed. 3) Two methods using a multivariate analysis of variance for evaluating optimum condition of solid/liquid separation as viewed from a balance among various factors such as quantity and quality of water, sludge and energy are considered, and then a conceptual model with respect to optimum paths of sludge for its management is proposed.
