摘要
以乙酸锌为锌原,通过水热法制备了纳米ZnO颗粒,通过XRD、SEM、FT-IR等分析了样品的晶格结构、微观形貌和光谱特性。采用序批式活性污泥工艺(SBR),研究了纳米ZnO颗粒对活性污泥硝化作用的影响。结果表明,合成出的纳米ZnO颗粒为标准的纤锌矿结构,具有较高的结晶度,分散性较好,呈现颗粒状,粒径尺寸在25~45 nm之间;随着纳米ZnO颗粒添加量的增加,SBR溶液中的Zn^(2+)浓度逐渐上升,活性污泥吸附纳米ZnO颗粒前后形态变化表明,颗粒污泥在吸附前表面较为光滑,吸附后表面呈现出较多的凸起状斑点,纳米ZnO颗粒在污泥表面分布不均匀;随着纳米ZnO颗粒添加量的增加,亚硝化颗粒污泥的硝化抑制作用逐渐增大,当纳米ZnO颗粒的添加量为50 mg/L,在270 min时,颗粒污泥对NH_(4)^(+)-N的去除率最低为52.35%,对NO_(2)^(-)-N和NO_(3)-N的生成量最低为98.5和11.9 mg/L,相比不添加纳米ZnO颗粒的生成量分别降低了38.93%和42.79%。
Nano-ZnO particles were prepared by hydrothermal method with zinc acetate as zinc raw material.The lattice structure,microstructure and spectral properties of the samples were analyzed by XRD,SEM and FT-IR.The effect of nano-ZnO particles on nitrification of activated sludge was studied by sequencing batch reactor(SBR).The results showed that the synthesized nano-ZnO particles were standard wurtzite structure,with high crystallinity,good dispersion,granular shape and particle size between 25~45 nm.With the increase of the amount of nano-ZnO particles,the concentration of Zn^(2+) in SBR solution increased gradually.The morphological changed of activated sludge before and after adsorption of nano-ZnO particles showed that the surface of granular sludge was relatively smooth before adsorption,and there were many convex spots on the surface after adsorption.The nano-ZnO particles were unevenly distributed on the surface of sludge.With the increase of the amount of nano-ZnO particles,the nitrification inhibition of nitrous granular sludge increased gradually.When the addition amount of nano-ZnO particles was 50 mg/L,at 270 min,the minimum removal rate of NH_(4)^(+)-N by granular sludge was 52.35%,and the minimum generation amount of NO_(2)^(-)-N and NO_(3)^(-)-N were 98.5 and 11.9 mg/L,which decreased by 38.93%and 42.79%respectively compared with that without nano-ZnO particles.
作者
宋旸
梁宏宝
陈忠喜
马骏
SONG Yang;LIANG Hongbao;CHEN Zhongxi;MA Jun(School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China;The First Oil Production Plant of Daqing Oilfield Co.,Ltd.,Daqing 163000,China;Oilfield Construction Design and Research Institute of Daqing Oilfield Co.,Ltd.,Daqing 163712,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第8期8134-8139,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(21003028)。
