摘要
为探究α-Fe_(2)O_(3)与活性炭协同吸附对尿液的处理效果,本文考察了铁炭比、投加量及尿液酸预处理的影响,并重点分析了协同吸附特性。研究发现,铁炭比为0.6时,尿液中总有机碳(TOC)、PO_(4)^(3-)-P、总磷(TP)的去除率分别为39.51%、71.03%和76.79%,TOC的去除主要依靠活性炭的吸附作用,而PO_(4)^(3-)-P主要依靠α-Fe_(2)O_(3)的作用,尿液酸预处理可显著强化PO_(4)^(3-)-P的吸附。TOC和PO_(4)^(3-)-P的吸附过程均符合Redlich-Peterson吸附等温线模型,为单层吸附和多层吸附共同作用。动力学研究发现,TOC和PO_(4)^(3-)-P的吸附均可在24h内达到吸附平衡,PO_(4)^(3-)-P的动力学吸附过程更符合Elovich模型,即不均匀界面上的多层吸附,而TOC的动力学过程主要受扩散速率控制。同时,协同吸附对发光溶解性有机物(CDOM)的去除率可达72.16%,对腐殖酸类的吸附效果最佳,酸预处理主要减少酪氨酸类、色氨酸类和可溶性微生物代谢产物的吸附。P的去除主要依靠其与α-Fe_(2)O_(3)和尿液中无机盐的共沉淀作用,并以无机盐沉积的形式附着于活性炭孔道内。
The effects of iron/carbon ratio,absorbent dosage,and acid pretreatment of urine on the synergistic adsorption of α-Fe_(2)O_(3) and activated carbon(AC)were investigated.Its removal efficiency on urine treatment and characteristics were analyzed and discussed.The results showed that the removal rates of total organic carbon(TOC),P_(4)^(3-)-P and TP were 39.51%,71.03% and 76.79%,respectively,when the iron/carbon ratio was 0.6.The removal of TOC mainly depended on the adsorption of AC,while the removal of PO_(4)^(3-)-P relied on α-Fe_(2)O_(3).Acid pretreatment of urine greatly improved the adsorption of P_(4)^(3-)-P.The adsorption processes of TOC and P_(4)^(3-)-P were both in accordance with the Redlich-Peterson adsorption isotherm,specifically,the synergy of monolayer adsorption and multilayer adsorption.The results of kinetic analysis showed that the adsorption of TOC and P_(4)^(3-)-P could reach the equilibrium within 24h.The adsorption process of P_(4)^(3-)-P can be explained by Elovich model,which is multi-layer adsorption occurred on the inhomogeneous interface.However,the adsorption of TOC is mainly controlled by the diffusion rate.Meanwhile,the removal rate of chromophoric dissolved organic matter(CDOM)was 72.16% with the best adsorption effect of humic acid.The adsorption of tyrosine,tryptophan,and soluble microbial products could be reduced by acid pretreatment.The removal of P was due to the coprecipitation between P and α-Fe_(2)O_(3) and inorganic ions in urine.Then,it was attached to the pore of AC in the form of inorganic salt deposition.
作者
焦赟仪
周书葵
张良长
艾为党
康赛
李晨璐
郑利兵
魏源送
JIAO Yunyi;ZHOU Shukui;ZHANG Liangchang;AI Weidang;KANG Sai;LI Chenlu;ZHENG Libing;WEI Yuansong(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;School of Civil Engineering,University of South China,Hengyang 421001,Hunan,China;National Key Laboratory of Human Factors Engineering,China Astronaut Research and Training Center,Beijing 100094,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第4期2347-2356,共10页
Chemical Industry and Engineering Progress
基金
国家自然科学基金青年基金(51908539)
人因工程国家重点实验室2019预研基金(6142222190715)。
