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Study on the Mechanism of Advanced Oxidation of Thermally Activated Persulfate and Its Application in the Advanced of Papermaking Wastewater
Received:June 26, 2023  
DOI：10.11980/j.issn.0254-508X.2023.08.017
Key Words:TAP  papermaking wastewater  advanced treatment  COD  radicals
Fund Project:南宁邕江计划：城镇污水处理提质减碳关键技术开发及产业化应用（2021001）；南宁重点研发计划：中国-东盟水环境技术创新平台建设（20225060）。
Author NameAffiliationPostcode
NONG Guoyou College of Resources， Environment and Materials， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 530004
XIE Hongjie College of Resources， Environment and Materials， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Bohuan Environmental Consulting Service Co.， Ltd.， Nanning， Guangxi Zhuang Autonomous Region， 530000 		530000
HUANG Wenyu* College of Resources， Environment and Materials， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Bossco Environmental Protection Technology Co.， Ltd.， Nanning， Guangxi Zhuang Autonomous Region， 530007 		530007
ZHU Hongxiang College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Bossco Environmental Protection Technology Co.， Ltd.， Nanning， Guangxi Zhuang Autonomous Region， 530007 		530007
XIONG Jianhua College of Resources， Environment and Materials， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Bossco Environmental Protection Technology Co.， Ltd.， Nanning， Guangxi Zhuang Autonomous Region， 530007 		530007
LU Lihai Guangxi Bossco Environmental Protection Technology Co.， Ltd.， Nanning， Guangxi Zhuang Autonomous Region， 530007 530007
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Abstract:In this research， the feasibility of thermally activated persulfate （TAP） oxidation for the papermaking wastewater was investigated. The effect of temperature and initial Na2S2O8 concentration on the TAP system was first investigated to achieve the optimal system. This was followed by a discussion of the effect of inorganic cations and anions presence in the system on the TAP system. Then an elaborate analysis of the oxidation mechanism of the TAP system and the possible degradation pathways of the pollutants was carried out. Finally application of the TAP system was used to the actual wastewater. The results showed that the CODCr of the simulated wastewater was degraded by 84.2% within 360 min under the optimized conditions of 70 ℃ and Na2S2O8 16 mmol/L. The efficiency of SO4-· radical based TAP system was less affected by inorganic ions. In addition， the main active substances in the TAP system were the ∙OH and SO4-· radicals， both of which plaied a major role in the degradation of organic pollutants in simulated wastewater. Besides， other reactive radicals plaied a supporting role in the degradation of pollutants， such as ·O2-， 1O2 and organic radicals. Then， the simulated organic pollutants were converted into small molecule compounds that ere eventually mineralised into CO2 and H2O by speculating on the possible degradation pathway. The TAP system was applied to the treatment of biochemical treatment effluent of actual wastewater and it was found that the CODCr and colority of the treated effluent met the GB 3544—2008 discharge standard at 70 ℃ and under acidic conditions.
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