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Treating dye wastewater by TiO_2 coated on coal cinder

Journal of Chongqing University 2009年第3期8卷 165-169页

作者：刘建华 Key Laboratory of Yangtze River Water Environment Ministry of Education Yibin University Department of Chemical and Material Engineering Jiangnan University

We investigated the photocatalytic degradation of dye wastewater by using titanium dioxide （TiO2） coated on a coal cinder. The coal cinder was used as the carrier, with a thin film of TiO2 coated on it by using the sol-gel method. Using the Congo red as the model pollutant for dye wastewater, we studied the decolorization efficiency, and effects of TiO2 film thickness and roasting temperature on the efficiency. We also evaluated the recycling and regeneration of the immobilized TiO2 （TiO2/cinder）. Results show that the decolorization rate of Congo red solution was more than 98% after 2.h treatment when we used TiO2/cinder calcined at 500 ℃ for 2 h and coated four times as the photocatalyst. At the same time, the TiO2/cinder remained high catalytic activity after being reused and regenerated for many times.

关键词： titanium dioxide coal cinder Congo red dye wastewater photocatalysis

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Removal and transformation of organic matters in domestic wastewater during lab-scale chemically enhanced primary treatment and a trickling filter treatment

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Journal of Environmental Sciences 2013年第1期25卷 59-68页

作者： Qingliang Zhao Huiyuan Zhong Kun Wang Liangliang Wei Jinli Liu Yu Liu State Key Laboratory of Urban Water Resources and Environments School of Municipal and Environmental EngineeringHarbin Institute of Technology School of Civil and Environmental Engineering Nanyang Technological University

To find a simple and economical way for treating the domestic wastewater irt small counties and towns, a process combining chemically enhanced primary treatment and a trickling filter （CEPT-TF, representing the physical and biological effects） was constructed and operated in laboratory conditions. The characteristic behaviors of dissolved organic matter in raw wastewater and effluents were examined during steady-state operation. Experimental results showed that the process of CEPT and TF in series was beneficial for the removal of hydrophobic and hydrophilic organics. Specially, the hydrophobic and aromatic materials could be preferentially removed in the CEPT unit, and the hydrophilic fraction in the TF. Structural changes of the organic fractions during the operation of the different units were also characterized via spectrum analysis.

关键词： dissolved organic matter fractionation fly ash coal cinder coagulation biodegradation

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Characteristics of Central Heating cinder and Its Influence on Soil Properties

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Meteorological and Environmental Research 2022年第2期13卷 78-82,97页

作者： Guoyu GAN Chao LI Xu ZHANG Li YANG Yunfeng CHEN Bo LIU Yanli LI Jifu LI College of Agriculture/Analytical&Testing Center of Agricultural Resources and Environment Yangtze UniversityJingzhou 434025China Jingzhou District Agricultural Science and Technology Service Center Jingzhou 434025China Key Laboratory of Fertilization Utilization of Waste Ministry of Agriculture and Rural AreasWuhan 430070China

[Objective]The research was designed to explore the effect of long-term stacking of solid waste produced in the coal-burning process of central heating enterprises on physical and chemical properties of soil.[Method]This study took the heating enterprises in Shenyang City as the research *** morphological structure and element composition of coal cinder were determined by continuously collecting coal and cinder samples in different *** the same time,the original soil and cinder soil of the stacking site were collected to determine the changes of soil morphological structure,element composition and physical and chemical properties,so as to provide reference for the resource utilization of local cinder waste and the potential pollution risk of the stacking site.[Result]The contents of C,H,O,N,and S non-metallic elements in coal cinder decreased by 69.5%,71.2%,76.0%,74.5%,and 34.6%,respectively when compared with raw coal;while the content of Si increased significantly by 95.7%.The contents of Al,K,and Fe in cinder decreased by 4.3%,60.2%,and 33.3%,respectively,while the contents of Mg and Na increased by 36.1%and 130.9%,*** with the original soil,the contents of C,H,and O in shallow cinder soil and deep cinder soil increased by 126.5%,67.9%,80.93%,and 21.3%,25.0%and 42.3%,*** residual carbon existed in the form of activated *** contents of Mg,Al,K,Na,Ca,and Fe in shallow cinder soil and deep cinder soil increased by 61.6%,5.4%,46.1%,35.8%,32.5%,6.3%and 22.3%,12.3%,12.2%,15.6%,5.8%and 2.8%,respectively compared with the original *** content of heavy metal elements in coal cinder did not reach the detection *** the scanning electron microscope,the raw coal is mainly block structure,while the cinder is honeycombed and porous and dust.[Conclusion]cinder stacking can significantly improve the content of organic matter and available K in shallow cinder soil,and improve the porosity and permeability of ***

关键词： Central heating coal cinder Soil properties Element composition Morphology and structure

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