Pretreatment of metallurgical sewage via vacuum distillation driven by low-temperature exhausted gas from steel plants
Pretreatment of metallurgical sewage via vacuum distillation driven by low-temperature exhausted gas from steel plants作者机构：Department of Thermal Engineering NortheasternUniversity Shenyang 110819 Liaoning China State Environmental Protection Key Laboratory of Eco-Industry Northeastern University Shenyang 110819Liaoning China Shenyang Branch of China Aluminum International Engineering Co. Ltd. Shenyang Aluminum & Magnesium Engineering & Research Institute Co. Ltd.Shenyang 110001 Liaoning China School of Metallurgy Northeastern UniversityShenyang 110819 Liaoning China
出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)
年 卷 期：2018年第25卷第3期
页 面：291-297页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学]
基 金：This work was sponsored by the National Natural Science Foundation of China (51734004 21561122001) the China Scholarship Council (201702660037) and the Fundamental Research Funds for the China Central Universities (N162504011)
主 题：Metallurgical sewage Vacuum distillation Low-temperature waste heat Steel plant
摘 要：The metallurgical sewage has very complex component and a significant environmental perniciousness and needs high treatment costs. In addition, too much low-temperature waste heat is emitted owing to the lack of suitable users. Considering these concerns, a low-temperature-driven pretreatment method via vacuum distillation was proposed to treat the sewage from the metallurgical production. It uses the sensible heat carried by low-temperature exhausted gases to drive the distillation of sewage. The distilled water can be reused into the process as new water supply, while the enriched wastewater is discharged into the sewage treatment center for subsequent treatment. Converter dust removal sewage was chosen to perform an experimental observation. The variations of chemical oxygen demand, ammonia nitrogen, suspended solids, electrical conductivity, and pH of the condensate under different vacuum degrees and evaporation rates were mainly investigated. It can be found that the quality of the condensate gets better under certain conditions, which validates the feasibility of the proposed approach. Furthermore, by comprehensively analyzing the water quality indices and their influencing factors, the optimal vacuum degree was suggested to be controlled between 0.07 and 0.09 MPa, and the best evaporation rate was between 40 and 60%.
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