Experimental Investigation on Characteristics of High-Temperature Drying of Island Solid Waste

The problem faced by environmental pollution control of island exhibited similarities with those of the inland countryside, such as the backward infrastructure and sparse population. Meanwhile, the property of high moisture content of waste makes it difficult to be incinerated directly. Most remote islands rely on diesel-generator sets to satisfy power demands, which can produce abundant residual heat. Drying waste with the heat can also be a solution for waste incineration on the spot. In order to design the waste drying device, the experiments researching on drying characteristics of the island domestic garbage, were performed under the condition of available diesel generator flue gas temperature. Solid wastes from island and campus were included for comparison and Arrhenius equations which fitted to the waste drying process were obtained. According the results, following conclusions are summarized. The calorific value of solid waste increased significantly with the decrease of water content. Compared with campus solid waste which was treated by similar drying process, island solid wastes took longer time to dry. Under high temperature conditions, the drying process could be divided into adjustment stage and falling-rate stage, without the observation of constant-rate stage. To avoid self-ignition, temperature should be controlled below 220℃. The activation energy of island solid wastes is relatively higher, leading to more heat for drying.