纳米TiO<sub>2</sub>/ZJ-01复合相促脱剂对高浓度氨氮吹脱效率的协同强化机制研究

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Abstract In order to enhance the air-stripping removal efficiency of high concentration ammonia nitrogen (500~7000mg/L) from coal chemical wastewater and reduce thealkali consumption noticeably, a nano-TiO₂/ZJ-01 composite promoter was prepared, and its stability, efficiency and promoting mechanism were further investigated. The results showed that the nano-TiO₂/ZJ-01 composite promoter had the highest cost-efficient at the proportion of 6.0% and 0.4% (w.t) for organic fraction and 5nm TiO₂, respectively within 30min ultrasonic dispersion. The ammonia nitrogen air-stripping rate was up to 95.14% at the Nano-TiO₂/ZJ-01 dosage of 7.5mg/L as well as increasing by17.02%~32.46% under any pH values in the presence of the nano-TiO₂/ZJ-01. The ammonia nitrogen removal rate for original coal chemical wastewater when the nano-TiO₂/ZJ-01 existed in 40min was higher than that of the wastewater by adjusting alkalinity to pH=11.5using direct air-stripping method, indicating that the alkali consumption reduced sharply. Moreover, the mechanism of ammonia removal by the nano-TiO₂/ZJ-01 was investigated that the occurrences of the decreased liquid film resistance and the increased mass transfer contact area together with the reduced bubble size in the mass transfer process have arisen due to the great reduce of surface tension between gas and liquid phases, resulting in the escape of ammonia from wastewater accelerating. Meanwhile, the role of the nano-TiO₂/ZJ-01 existed in the air-stripping process contained the enhanced actions of the interfacial turbulence and convection and the accelerated renewal of liquid film side in bubble surface as well as the reduced thickness of effective mass transfer boundary layer, therefore the reduction of the ammonia-nitrogen mass transfer resistance and strengthening of the mass transfer between gas and liquid were occurred.

Key words： composite promoter high concentration of ammonia nitrogen nanofluid air-stripping efficiency enhanced mechanism

Received: 04 November 2021

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XT03

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	Articles by authors
	ZHANG Jia-cheng
	LIU Yong-jun
	LIU Pan
	ZHANG Ai-ning
	QI Hao
	LIU Zhe

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ZHANG Jia-cheng,LIU Yong-jun,LIU Pan等. Synergistic enhancement mechanism of nano-TiO₂/ZJ-01 composite promoter on the removal efficiency of high-concentration ammonia nitrogen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2628-2637.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I6/2628

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