{"title":"Composite biochar: a potential approach for comprehensively utilizing various solid wastes","authors":"Li-Juan Feng, Yang-Yang Ou, An-Rong Liu, Jin-Hong Zhang, Hong-Yan Chen","doi":"10.1007/s10163-025-02167-x","DOIUrl":null,"url":null,"abstract":"<div><p>Pyrolysis of solid waste to produce biochar is a scientifically supported waste disposal and resource recycling method. Pyrolying sewage sludge to give sludge biochar is an attractive way of utilizing sewage sludge. However, sewage sludge has a low carbon content, low specific surface area, and underdeveloped pore structure and poses environmental risks because of the heavy metal content. Co-pyrolysis of sludge with other solid wastes to give composite sludge biochar (CSBC) can optimize the physicochemical properties and decrease the environmental risks. The excellent physical and chemical properties of CSBC make it suitable for use as an adsorbent to remove pollutants from wastewater. Here, progress in preparing and using CSBC is reviewed. CSBC prepared at high temperatures has a larger specific surface area, which is favourable for physical adsorption. Low-temperature CSBC is more likely to perform chemical adsorption because of more functional groups produced. In addition, adding biomass waste improves the specific surface area, porosity and oxygen functional group content in CSBC, and that enhances the removal of both organic and inorganic pollutants in wastewater. CSBC prepared by adding non-biomass waste containing certain elements (such as Ca) has excellent adsorption performance for target pollutants (such as heavy metals). The conclusion is that CSBC is a promising material that can be used to remove pollutants, manage wastewater, and utilize solid waste. Preparing CSBC using multiple solid wastes is an environmentally friendly treatment solution for sludge.</p></div>","PeriodicalId":643,"journal":{"name":"Journal of Material Cycles and Waste Management","volume":"27 2","pages":"812 - 829"},"PeriodicalIF":2.7000,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Material Cycles and Waste Management","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s10163-025-02167-x","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Pyrolysis of solid waste to produce biochar is a scientifically supported waste disposal and resource recycling method. Pyrolying sewage sludge to give sludge biochar is an attractive way of utilizing sewage sludge. However, sewage sludge has a low carbon content, low specific surface area, and underdeveloped pore structure and poses environmental risks because of the heavy metal content. Co-pyrolysis of sludge with other solid wastes to give composite sludge biochar (CSBC) can optimize the physicochemical properties and decrease the environmental risks. The excellent physical and chemical properties of CSBC make it suitable for use as an adsorbent to remove pollutants from wastewater. Here, progress in preparing and using CSBC is reviewed. CSBC prepared at high temperatures has a larger specific surface area, which is favourable for physical adsorption. Low-temperature CSBC is more likely to perform chemical adsorption because of more functional groups produced. In addition, adding biomass waste improves the specific surface area, porosity and oxygen functional group content in CSBC, and that enhances the removal of both organic and inorganic pollutants in wastewater. CSBC prepared by adding non-biomass waste containing certain elements (such as Ca) has excellent adsorption performance for target pollutants (such as heavy metals). The conclusion is that CSBC is a promising material that can be used to remove pollutants, manage wastewater, and utilize solid waste. Preparing CSBC using multiple solid wastes is an environmentally friendly treatment solution for sludge.
期刊介绍:
The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles.
The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management.
The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).