摘要
本研究主要探究了热活化过硫酸盐(TAP)氧化法对造纸废水处理的可行性。首先研究温度和初始Na_(2)S_(2)O_(8)浓度对TAP体系的影响得出最优体系;接着讨论无机阳离子和阴离子的存在对TAP体系的影响;随后深入分析TAP体系的氧化机理以及污染物可能的降解途径;最后将TAP体系用于处理实际造纸废水。结果表明,在温度70℃和Na_(2)S_(2)O_(8)摩尔浓度16 mmol/L的优化条件下,模拟有机造纸废水的COD_(Cr)在360 min内降解率达84.2%。而基于SO_(4)^(-)·自由基的TAP体系受无机离子影响较小。另外,TAP体系中主要活性物质是·OH和SO_(4)^(-)·自由基,二者在模拟有机污染物的降解中发挥着主要作用。此外,其他活性自由基在污染物的降解过程中起到辅助作用,如·O_(2)^(-)、^(1)O_(2)和有机自由基。通过推测可能的降解途径,模拟有机污染物转化为小分子化合物后,最终被矿化为CO_(2)和H_(2)O。将TAP体系应用于实际造纸废水的生化处理出水中,发现在70℃和酸性条件下,处理出水的COD_(Cr)和色度均达到GB 3544—2008排放标准。
In this research,the feasibility of thermally activated persulfate(TAP)oxidation for the papermaking wastewater was investigated.The effect of temperature and initial Na_(2)S_(2)O_(8) 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 COD_(Cr) of the simulated wastewater was degraded by 84.2% within 360 min under the optimized conditions of 70℃ and Na_(2)S_(2)O_(8)16 mmol/L.The efficiency of SO_(4)^(-)·radical based TAP system was less affected by inorganic ions.In addition,the main active substances in the TAP system were the∙OH and SO_(4)^(-)·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·O_(2)^(-),^(1)O_(2)and organic radicals.Then,the simulated organic pollutants were converted into small molecule compounds that ere eventually mineralised into CO_(2)and H_(2)O 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 COD_(Cr) and colority of the treated effluent met the GB 3544-2008 discharge standard at 70℃and under acidic conditions.
作者
农国猷
谢宏杰
黄闻宇
朱红祥
熊建华
陆立海
NONG Guoyou;XIE Hongjie;HUANG Wenyu;ZHU Hongxiang;XIONG Jianhua;LU Lihai(College of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi Zhuang Autonomous Region,530004;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;Guangxi Bohuan Environmental Consulting Service Co.,Ltd.,Nanning,Guangxi Zhuang Autonomous Region,530000)
出处
《中国造纸》
CAS
北大核心
2023年第8期122-131,18,共11页
China Pulp & Paper
基金
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)。
