铁氧化物对活性炭处理尿液的影响  

Effect of iron oxides on urine treatment by activated carbon

作　　者：焦赟仪 郑利兵[2,3] 魏源送[2,3] 周书葵 JIAO Yunyi;ZHENG Libing;WEI Yuansong;ZHOU Shukui(School of Civil Engineering,University of South China,Hengyang 421001,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Department of Water Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]南华大学土木工程学院,衡阳421001 [2]中国科学院生态环境研究中心,环境模拟与污染控制国家重点联合实验室,北京100085 [3]中国科学院生态环境研究中心,水污染控制实验室,北京100085

出　　处：《环境工程学报》2020年第12期3381-3390,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年基金资助项目(51908539);中国-斯里兰卡水技术研究与示范联合中心项目。

摘　　要：采用椰壳、果壳和木质活性炭进行尿液处理,分别研究了铁氧化物及尿液预处理对椰壳炭处理尿液的影响。结果表明:椰壳炭的比表面积最高,具有最佳的尿液处理效果,对TOC、PO4^3−PO4^3−-P、TP、NH4^+NH4^+-N和TN的去除率可达35.02%、8.17%、11.98%、39.42%和14.79%;投加的铁氧化物对P的去除效果较好,去除率提高了14%,且酸预处理进一步提升了P的去除效果,去除率提高了9.29%;但在酸性条件下,有机物和NH^+4NH4^+-N的吸附能力略有所下降;吸附过程对有机物的削减主要是由于活性炭的吸附及尿素的分解所致;N去除的主要机理是由于鸟粪石的沉淀所致;P削减的主要原因为铁氧化物表面的羟基位点吸附和鸟粪石沉淀,酸性条件可促进铁氧化物和PO4^3−PO4^3−发生质子化过程,因此,其可进一步强化P的去除。综合上述结果,铁氧化物-活性炭吸附可有效去除尿液中有机物和P,是一种有效的尿液预处理工艺,以上结果可为尿液的处理和回收提供参考。Three kinds of activated carbon(coconut shell,nutshell and wooden activated carbons)were applied for urine treatment,and the effect of iron oxides and urine acidification treatment on urine treatment by coconut shell activated carbons was carefully investigated in terms of N,P and organic matters.The result showed that coconut shell activated carbon had the best urine treatment performance due to its high specific surface area,and the removal rates of TOC,PO4^3−PO4^3−-P,TP,NH^+4NH4^+-N and TN could reach 35.02%,8.17%,11.98%,39.42%and 14.79%,respectively.The addition of iron oxides could lead to the increase of phosphorus removal rate by 14%,and the acidification pretreatment could further elevate TP removal rate by 9.29%.While under the acidic conditions,the adsorption ability of organics and NH^+4NH4^+-N slightly decreased.The adsorption on activated carbon and urea decomposition were key reasons for TOC removal,and the struvite precipitation was the main reason for N removal,adsorption by the hydroxyl groups on the surface of iron oxide and struvite precipitation were the key reasons for P removal.Acidification pretreatment could promote the protonation between hydroxyl groups on iron oxide and phosphate and further enhance P removal.In conclusion,adsorption by iron oxides-activated carbon had excellent removal performances towards organic matters and P,which showed a great potential for urine pretreatment,it will provide reference for the treatment and recovery of urine.

关 键 词：活性炭 吸附 铁氧化物 尿液 磷 

分 类 号：X703[环境科学与工程—环境工程]