Development of lightweight aggregate from dry sewage sludge and coal ash |
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| Authors: | Xingrun Wang Yiying Jin Zhiyu Wang Yongfeng Nie Qifei Huang Qi Wang |
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| Affiliation: | 1. Chinese Research Academy of Environmental Science, Beijing 100012, China;2. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;1. Department of Physical Chemistry, School of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Av. Carlos III, s/n, 45071 Toledo, Spain;2. Department of Chemical Engineering, School of Civil Engineering, University of Castilla-La Mancha (Spain), Av. Camilo José Cela, 13071 Ciudad Real, Spain;3. Jap Energeticas S.L. Colon, 70, piso 2, 46004 Valencia, Spain;4. Arcillas Refractarias, S.A. (ARCIRESA), Fábrica, Barrio Castiello, s/n, 33690, Lugo de la LLanera, Asturias, Spain;5. INTROMAC, Ave. de la Universidad, s.n, Campus UEx., 10071 Cáceres, Spain;6. Town hall of Cáceres, Plaza Mayor, 1, 10003 Cáceres, Spain;1. Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China;2. College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China;3. College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou, 450001, PR China;4. College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, PR China;1. ISTEC-CNR, Via Granarolo 64, Faenza 48018, Italy;2. Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Federico II University, Naples 80134, Italy;3. Dipartimento di Studi Geologici ed Ambientali, Sannio University, Benevento 82100, Italy;1. College of Civil Engineering, Hunan University, Changsha, Hunan, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;3. Department of Materials Science and Engineering, Tianjin Chengjian University, Tianjin, China;4. Tianjin Key Laboratory of Soft Soil Environmental and Engineering Properties, China;5. Henan Provincial Academy of Building Research, Zhengzhou, Henan, China;1. University of Birmingham, UK |
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| Abstract: | In this study, dry sewage sludge (DSS) as the principal material was blended with coal ash (CA) to produce lightweight aggregate. The effects of different raw material compositions and sintering temperatures on the aggregate properties were then evaluated. In addition, an environmental assessment of the lightweight aggregate generated was conducted by analyzing the fixed rate of heavy metals in the aggregate, as well as their leaching behavior. The results indicated that using DSS enhanced the pyrolysis–volatilization reaction due to its high organic matter content, and decreased the bulk density and sintering temperature. However, the sintered products of un-amended DSS were porous and loose due to the formation of large pores during sintering. Adding CA improved the sintering temperature while effectively decreasing the pore size and increasing the compressive strength of the product. Furthermore, the sintering temperature and the proportion of CA were found to be the primary factors affecting the properties of the sintered products, and the addition of 18–25% of CA coupled with sintering at 1100 °C for 30 min produced the highest quality lightweight aggregates. In addition, heavy metals were fixed inside products generated under these conditions and the As, Pb, Cd, Cr, Ni, Cu, and Zn concentrations of the leachate were found to be within the limits of China’s regulatory requirements. |
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