Study on Scale Formation in Leachate Transport Pipelines Based on System Dynamics(SD)

Abstract

This study investigates the scaling process in landfill leachate collection and transportation pipelines. A system dynamics model was established to predict pipeline scaling, employing a combined approach of orthogonal experiments， and simulation techniques to account for the nonlinear coupling effects of crystallisation kinetics and thermodynamics, among other factors. Different parameters were adjusted to study variations in scaling behaviour. The results show that the model predictions of scale formation changes are basically consistent with the experimental scale formation changes. The scale formation shows a rapid increase followed by a decrease， and then gradually stabilises and fluctuates. The water quality factors are ranked as Ca2+ > COD > pH > Humus substances. The effect of temperature on scale formation can be divided into two stages. This study provides new insights into pipeline scale formation research.