新型生物炭材料对TNT生产废水去除性能  

Removal performance of TNT production wastewater with novel biochar materials

作　　者：张瑛[1] 白璐璐 赵昱昊 ZHANG Ying;BAI Lulu;ZHAO Yuhao(Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学环境学院工业生态与环境工程教育部重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》2022年第1期37-45,共9页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(21477014);国家重点研发计划资助项目(2020YFC1807804).

摘　　要：合成了新型含持久性自由基(PFRs)的生物炭(BC_(PFRs))及其复合材料nZVI/BC_(PFRs),考察了BC_(PFRs)在添加氧化剂(BC_(PFRs)/Fe^(^(2+))/H_(2)O_(2)和BC_(PFRs)/Fe^(3+)/H_(2)O_(2))和不添加氧化剂(nZVI/BC_(PFRs))条件下对TNT生产废水的去除性能.结果表明nZVI/BC_(PFRs)的去除效果最显著,对总有机碳(TOC)的去除率为58%,对总氮(TN)的去除率为78%,Fe^(2+)/H_(2)O_(2)的矿化能力和Fe^(3+)/H_(2)O_(2)的脱氮能力在BC_(PFRs)的诱导下分别提高了8.4%和17.4%.对处理前后的废水进行毒性分析,结果表明nZVI/BC_(PFRs)处理后的出水毒性最小.GC-MS和LC-MS对废水组分的检测结果表明,处理后出水中硝基芳烃化合物的种类大大减少,nZVI/BC_(PFRs)体系对TNT生产废水的去除率最高,表明nZVI/BC_(PFRs)复合材料在难降解污染物的去除领域具有很好的应用前景.A new kind of biochar(BC_(PFRs))containing persistent free radicals(PFRs)and its composite nZVI/BC_(PFRs)are synthesized.The performances of BC_(PFRs)with oxidant as BC_(PFRs)/Fe^(2+)/H_(2)O_(2),BC_(PFRs)/Fe^(3+)/H_(2)O_(2)and without oxidant as nZVI/BC_(PFRs)are investigated in the removal performance of TNT production wastewater.It is found that nZVI/BC_(PFRs)exhibits the best performance on total organic carbon(TOC)and total nitrogen(TN)with removal rate of 58%and 78%,while the addition of BC_(PFRs)improves the mineralization ability of Fe^(2+)/H_(2)O_(2)(8.4%)and the denitrification ability of Fe^(3+)/H_(2)O_(2)(17.4%).Meanwhile,the toxicity analysis of the TNT wastewater before and after treatment shows that the effluent toxicity from nZVI/BC_(PFRs)system is less than others.The components analysis of wastewater with GC-MS and LC-MS shows that the types of nitroaromatic compounds are dominantly reduced,where nZVI/BC_(PFRs)system gives the best removal performance.The results suggest nZVI/BC_(PFRs)composite is a kind of promising material to tackle the contaminants released in environment.

关 键 词：生物炭(BC) 持久性自由基(PFRs) 纳米零价铁(nZVI) nZVI/BC_(PFRs) TNT生产废水 

分 类 号：X52[环境科学与工程—环境工程]