热处理耦合酸活化对铝污泥吸附磷酸盐影响  

Effect of thermal treatment coupled with acid activation on phosphate adsorption by alum sludge

作　　者：陈爱侠[1,2,3] 蒲马雪儿 吕露雪 卫潇 高雅君 范志杰 CHEN Ai-xia;PU Ma-xue-er;LYU Lu-xue;WEI Xiao;GAO Ya-jun;FAN Zhi-jie(School of Water and Environment,Chang'an University,Xi'an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education,Chang'an University,Xi'an 710054,China;Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources,Chang'an University,Xi'an 710054,China;Karamay Ecological Environment Bureau,Karamay 834000,China)

机构地区：[1]长安大学水利与环境学院,陕西西安710054 [2]长安大学,旱区地下水文与生态效应教育部重点实验室,陕西西安710054 [3]长安大学,水利部旱区生态水文与水安全重点实验室,陕西西安710054 [4]克拉玛依市生态环境局,新疆克拉玛依834000

出　　处：《中国环境科学》2024年第12期6753-6763,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(42377060,42207101);长安大学中央高校基本科研业务费专项资金(300102293208)。

摘　　要：给水厂铝污泥(AIS)因其内部丰富的铝铁氧化物使其对磷酸盐具有一定的吸附螯合能力.然而铝污泥成分复杂,所含杂质会抑制对磷酸盐的吸附.通过简单的热处理耦合酸活化的方式,研究铝污泥杂质的去除和吸附容量的提高,结果表明:在600℃下热处理1h,使用2.0mol/L盐酸以固液比为1:1进行酸活化,处理后的铝污泥(HA-AIS)对磷酸盐的吸附量高达18.3mg/g,是原生铝污泥的2.4倍.其在阴阳离子共存和金属离子溶出实验中显现一定的稳定性.吸附动力学和热力学研究说明其主要为化学吸附.结合SEM、XRD和BET等表征分析,吸附机理以配体交换为主,静电引力、氢键和表面沉积也起一定作用.该研究为铝污泥处置和磷污染控制提供了新思路,实现了“以废治废,变废为宝”的双赢策略.Alum sludge(AIS) originating from water treatment plants possesses notable phosphate adsorption and chelating capabilities,due to its rich content of aluminum and iron oxides.However,the effectiveness of AIS in phosphate adsorption is often hampered by its complex composition and the presence of impurities.To overcome these obstacles,this study adopted a simple yet effective method that combines thermal treatment with acid activation.The results showed that after being subjected to thermal treatment at 600℃ for 1hour and then activated with 2.0mol/L hydrochloric acid at a solid-liquid ratio of 1:1,the AIS achieved a phosphate adsorption capacity of 18.3mg/g.This represented a 2.4-fold increase compared to the untreated AIS.Furthermore,the treated AIS demonstrated remarkable stability in tests involving the coexistence of anions and cations,as well as metal ion dissolution.The investigation into adsorption kinetics and thermodynamics revealed that the adsorption process was primarily driven by chemisorption.Complementary analyses using SEM,XRD,and BET further confirmed that the adsorption mechanism was dominated by ligand exchange.Additionally,electrostatic attraction,hydrogen bonding,and surface deposition also played pivotal roles in the adsorption process.These findings not only provide a promising perspective on alum sludge disposal and phosphorus pollution control but also embody a promising win-win strategy of "turning waste into treasure".

关 键 词：铝污泥 热处理酸活化 磷酸盐 吸附 

分 类 号：X703.5[环境科学与工程—环境工程]