PVA/CaO_(2)底泥原位修复材料的制备及其应用  

Preparation of PVA/CaO_(2) and Its Application to in-situ Bottom Mud Remediation

作　　者：陈晨 赵东华 邢思阳 贾飞跃 翟春晓 于飞 马杰[2,4] CHEN Chen;ZHAO Donghua;XING Siyang;JIA Feiyue;ZHAI Chunxiao;YU Fei;MA Jie(Shanghai Waterway Engineering Design and Consulting Co.,Ltd.,Shanghai 200120,China;Research Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China)

机构地区：[1]中交上海航道勘察设计研究院有限公司,上海200120 [2]同济大学环境科学与工程学院,环境功能功材料研究中心,上海200092 [3]上海海洋大学海洋生态与环境学院,上海201306 [4]上海污染控制与生态安全研究院,上海200092

出　　处：《环境科学与技术》2022年第2期112-120,共9页Environmental Science & Technology

基　　金：上海市2021年度“科技创新行动计划”社会发展科技攻关:太湖流域水体智能监测与精准治理关键技术研究与示范(21DZ1202500)。

摘　　要：该文以过氧化钙(CaO_(2))为释氧材料,活性炭、铁碳微电解填料为吸附和催化材料,以聚乙烯醇PVA为包埋剂,制备系列PVA/CaO_(2)复合材料。研究结果表明,PVA包埋的缓释氧材料(OSRC)释氧速率为0.134 mg/(L·h),相对于未包埋的CaO_(2)粉末(0.955 mg/(L·h))减缓了7/8,呈现显著的缓释效果;活性炭和铁碳微电解填料的加入可进一步降低OSRC的释氧速率(0.057 mg/(L·h)),颗粒活性炭掺杂OSRC具有更好的释氧效果,释氧时间可达400 h以上,同时实现了对于水体中TN、TP等富集和降解。将改性PVA/CaO_(2)复合材料应用于底泥修复中,结果表明改性PVA/CaO_(2)复合材料显著增加了上覆水溶解氧浓度(30.7%)。经过40余天的底泥修复试验表明,投加改性PVA/CaO_(2)复合材料可以显著降低上覆水和底泥间隙水中TP、NH_(4)-N等浓度,上覆水中TN、TP和NH_(4)-N去除率分别为29.8%、42.0%和51.3%,底泥间隙水中TN、TP和NH_(4)-N去除率分别为34.0%、52.5%和86.3%。改性PVA/CaO_(2)复合材料可以同时实现提高水体溶解氧浓度、为微生物提供附着基质、吸附与富集水体中污染物以及催化氧化还原水体污染物等多种作用,有效改善水-泥界面微环境、阻隔内源营养物质释放等,从而实现水质提升和水生态系统恢复的目的。This study described the application of new materials(PVA/CaO_(2)composite) for remediation of bottom-mud of water bodies. Preparation of the materials involved calcium peroxide(CaO_(2)) which was used as the active material, and activated carbon plus iron-carbon micro-electrolysis packing used as adsorption and catalytic materials, and polyvinyl alcohol(PVA) used as the embedding agent. Experiment with the composite materials as OSRC(O_(2)slow-releasing compounds)showed that the O_(2)release rate of the PVA-embedded slow-release oxygen material equaled to 0.134 mg/(L · h), which was 7/8 slower than that without PVA-embedded CaO_(2)powder(0.955 mg/(L·h)), showing significant slow-release effects.Furthermore, addition of activated carbon and iron-carbon micro-electrolysis packing could enhance reducing the oxygen release rate of OSRC;OSRC doped with granular activated carbon could be releasing O2extending for more than 400 h, and at same time had better re-oxygenation effects, thus realizing the functions of adsorption, enrichment and degradation of TN, TP and other contaminants in water bodies. When the modified PVA/CaO_(2)composite materials were applied to the water-bodies ’bottom mud remediation, the concentration of dissolved oxygen(DO) in the overlying water could be remarkably increased, up 30.7%. With more than 40 days elapsed, result of the bottom-mud remediation experiment shown that adding OSRC oxygen release agent to the sediment could significantly reduce the concentration of TP, NH_(4)-N and other pollutants in the overlying water and the interstitial water of the sediment, i.e. the removal rates of TN, TP, and NH_(4)-N contained in the overlying water attained 29.8%, 42.0%, and 51.3%, respectively, and removal rates of TN, TP, and NH4;N in the interstitial water of the bottom mud were 34.0%, 52.5%, and 86.3%, respectively. In summary, PVA/CaO_(2)composite materials could simultaneously achieve multiple functions such as increasing concentration of DO in the water body, providing an attachment ma

关 键 词：过氧化钙 缓释氧材料 聚乙烯醇 营养盐 颗粒活性炭 

分 类 号：X52[环境科学与工程—环境工程]