摘要
针对含氟矿井水中有机物含量较高的问题,使用混凝区域图研究了在腐殖酸(HA)存在的条件下Al_(13)混凝除氟的效果及相关的影响因素;使用电喷雾飞行时间质谱(ESI-TOF-MS)、差分吸收光谱法(DOAS)和X射线光电子能谱分析(XPS)考察了HA与F在混凝过程中的竞争关系,且表征了Al_(13)与F的络合产物;分析了HA影响Al_(13)除氟的可能机理。结果表明:在最佳投加量下,Al_(13)对氟的去除率在HA共存时提高了10%以上,余铝浓度下降;同时,混凝过程中所形成的絮体结合更加紧密且易沉降。DOAS分析结果表明,在混凝初始阶段,HA对Al_(13)的竞争具有一定的优势,此时主要形成Al_(13)与有机物的络合体;随着反应的继续进行,Al_(13)水解产生低聚态铝,此时氟主要通过与Al-OH的离子交换被去除,同时通过有机物絮体的网捕与吸附架桥作用进一步吸附游离态氟。
In order to improve the fluoride removal efficiency for fluorine-containing mine water with high organics content by using Al_(13) coagulation,the coagulation area diagram was used to study the fluoride removal effect by Al_(13) coagulation in the presence of humic acid(HA)and the related influencing factors.In order to investigate the mechanism of the influence of organic matter on the defluorination of Al_(13),electrospray time-offlight mass spectrometry(ESI-TOF-MS),differential absorption spectroscopy(DOAS),and X-ray photoelectron spectroscopy(XPS)were used to analyze the competitive relationship between HA and fluoride in the coagulation process,and the complex product between Al_(13) and F was also characterized.The results indicated that at the optimal Al_(13) dosage,the removal rate of fluorine increased by over 10%in the presence of HA,the residual aluminum content decreased.The flocs formed in the coagulation process were compacted and easily settled.According to DOAS analysis,at the beginning of the coagulation,HA had an advantage in the competition with Al_(13),and Al_(13)-organic matter complex mainly occurred.As the reaction continued,Al_(13) was hydrolyzed to produce oligomeric Al nuclear material,and fluoride was mainly removed by ion exchange with Al-OH.At the same time,the flocs formed in the coagulation process containing organic matter further adsorbed free fluorine by netting and adsorption bridging effects.
作者
孙鹏
童庆
象豫
刘煜
徐慧
SUN Peng;TONG Qing;XIANG Yu;LIU Yu;XU Hui(Ningxia Environmental Protection Group Co.Ltd.,Ningxia 750004,China;Shenzhen shenshui Water Resources Consulting Co.Ltd.,Shenzhen 518000,China;State Key Laboratory of Environmental Water Quality,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2022年第1期143-153,共11页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金面上项目(52030003,51778604)
宁夏回族自治区重大项目(2019BFG02032)。
关键词
腐殖酸
氟化物
混凝
絮体
余铝
humic acid
fluoride
coagulation
flocs
residual aluminum
