Nowadays,the coal-mine wastewater contained high concentration of iron ion and manganese ion was treated by filter process,in which manganese sand,as a kind of common filter media,was extensively applied,but its disad...
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ISBN:
(纸本)9781612843377
Nowadays,the coal-mine wastewater contained high concentration of iron ion and manganese ion was treated by filter process,in which manganese sand,as a kind of common filter media,was extensively applied,but its disadvantage is long set-up period for manganese ion *** this paper,for many advantages of hydrated manganese dioxide,such as high surface areas,abundant surface hydroxyl and strong absorption capacity,MnCl2 and KMnO4 solution were selected as modified agents for lava media in order to make its surface form the layer of hydrated manganese dioxide,thus it can enhance manganese ion removal efficiency and shorten set-up *** paper firstly investigated the optimization of preparation parameters,namely 4times of soaking and oxidizing by modified agents and 1hour soaking-time were considered as optimal preparation ***,the pollutants removal efficiencies were compared among the modified lava media,lava media,modified manganese sand and manganese sand,results showed that modified lava media had high-efficiency and durable Mn2+ ***,the experiment of backwashing and generation for modified lava media showed that backwashing can recover the removal capacity for total iron and turbidity,and only generation can recover the removal capacity for Mn2+.The specific generation method was that the saturated media was submerged in 1mol/L NaNO3 solution for 15min.
Electrochemical oxidation, as one of the environmental-friendly technologies in wastewater treatment processes, has high efficiency in organic pollutants degradation and ammonia and nitrate removal. Wenyu River(a rive...
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China enjoys rich lignite resources. However, the development and utilization level of lignite in China is low compared with other countries. The lignite in China is distributed mainly in the eastern areas of Inner Mo...
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ISBN:
(纸本)9781424462551
China enjoys rich lignite resources. However, the development and utilization level of lignite in China is low compared with other countries. The lignite in China is distributed mainly in the eastern areas of Inner Mongolia and in the northeast provinces. The characteristics of China's lignite are closely related to its coal-forming age. Due to the shallow buried coal seams, most parts of the lignite coalfields in China use adit or inclined shaft mining. In China, the application of lignite includes combustion for power generation, pyrolysis and coking, liquefaction, gasification and preparation of wax etc..
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