Treatment of Bio-waste via Autoclaving and Effect on Its Volume Reduction and Reuse
Date Issued
2011
Date
2011
Author(s)
Lin, Yi-Shiou
Abstract
The autoclaving is a pretreatment step of the mechanical heat treatment (MHT) process. It follows with the mechanical separation step, achieving the resources recovery and reutilization. In this study, the autoclaving was applied to pretreat some key components of the municipal solid waste (MSW) before their further separation and reuse. The effects of operation parameters on the characteristics of products and emission of pollutants were examined.
Two autoclaving systems were employed. In the laboratory, the saturated steam was introduced from a small boiler (600 mL) to treat the bamboo chopsticks (BC) loaded in an autoclave (1500 mL). In the on-site experiments, the superheated steam with the gauge pressure of 7 kg/cm2 and temperature of 170 ℃ was supplied from Letzer Incineration Plant. The Kitchen waste and garden waste (or litterfall) were autoclaved in a pilot-scale batch reactor (530 L). The target bio-waste was autoclaved for 15 to 60 minutes at 135 ℃, 155 ℃ and 165 ℃, respectively. After autoclaving, the volume of bamboo (VBC) remains about the same. The dry-basis heating value decreases slightly. As for the kitchen waste, the autoclaving offers a significant volume reduction. The autoclaved kitchen waste bears a high water content and is not suitable for the manufacture of refuse derived fuel (RDF). However after using Brown materials to regulate its moisture, it can be appropriately processed to produce the compost with better economic value. Regarding the garden waste, its energy density increases after autoclaving. Thus, the autoclaved garden waste is suitable for making the RDF.
Subjects
Autoclaving
bio-waste
kitchet waste
raw food waste
garden waste
leaf litter
litterfall
plant litter
biofuel
Type
thesis
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