期刊
BIOMASS CONVERSION AND BIOREFINERY
卷 11, 期 2, 页码 289-299出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13399-019-00572-5
关键词
Slow pyrolysis; Microalgae; Chlorella; Sewage sludge; Biochar; Bio-oil
Transforming sewage sludge into biochar is a sustainable resource recovery process that addresses issues in wastewater-based circular economy, while combined activated sludge-microalgae systems can remove both carbon and nutrients from wastewater simultaneously, but may pose challenges in solid residue disposal practices.
In addition to the various options available for sewage sludge disposal, a possible process for sustainable resource recovery from this residue is its transformation into biochar, achieved by post-processing through pyrolysis. Biochar obtained from sewage sludge is considered one of the most interesting final products in a wastewater-based circular economy, as proven by the multitude of its possible uses tested so far in various applications. Recently, combined activated sludge (AS)-microalgae systems have been proposed to simultaneously remove both carbon and nutrients from wastewaters, as alternative to conventional technologies such as those based on denitrification and chemical phosphorus precipitation. Although this combined process could be efficient from the point of view of component removal from effluents, it generates potential issues to solid residue disposal practices, as algae normally respond poorly to traditional, mechanical drying processes. In this study, a disposal solution was investigated, consisting of pyrolysation of a mixed sludge/bioalgae matrix under different conditions: in such way, not only landfilled residuals are practically eliminated, but a material with multiple potential end uses is recovered. Process feedstock (algae, sludge and combinations thereof) and end-products (biochar and bio-oil) were characterised after pyrolysis under different conditions. Algae alone were also subject to preliminary solvent oil extraction to assess whether increased biochar production would result from such process variation (which it did, increasing biochar production by 25-33%). A comprehensive discussion on properties of end products as function of process design, possible applications in a circular economy cycle and advantages of co-pyrolysis follows.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据