研究一种 WO 和 TiO 纳米粒子混合物在废水处理厂中的命运和行为。
An investigation of the fate and behaviour of a mixture of WO and TiO nanoparticles in a wastewater treatment plant.
机构信息
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg 2028, South Africa.
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg 2028, South Africa.
出版信息
J Environ Sci (China). 2019 Feb;76:37-47. doi: 10.1016/j.jes.2018.03.018. Epub 2018 Mar 24.
The fate and behaviour of WO and TiO mixture were investigated following the Organisation for Economic Co-operation and Development 303A guidelines. The nanoparticles were found not to influence the chemical oxygen demand removal efficiency which was maintained >80% hence the activated sludge process was on affected. The nanoparticles were eliminated from the wastewater with a greater percentage of 99.8% for TiO and 95.5% for WO found in the sludge. The activated sludge process also had no effect of the polymorphs of the nanoparticles as X-ray diffraction revealed presence of monoclinic WO and anatase TiO which were spiked into the influent. The nanoparticles were mainly removed by bio-adsorption on the activated sludge surface. The total plate count revealed that the bacterial colonies present in the control and the test units were comparable during the gradual introduction of nanoparticles in the chambers. The biomass was >0.75 MLVSS/MLSS (mixed liquor volatile suspended solids/mixed liquor suspended solids) in both the aeration vessels thus a greater proportion of the sludge were the microorganisms. A greater percentage of the Ti and W found in the effluent was mainly due to the nanoparticles adsorbed on the suspended solids with only 3.6% Ti and 28.6% W due to dissolution of nanoparticles.
按照经济合作与发展组织 303A 指南的规定，研究了 WO 和 TiO 混合物的命运和行为。研究发现，纳米颗粒不会影响化学需氧量的去除效率，该效率保持在>80%以上，因此，活性污泥工艺不受影响。纳米颗粒以大于 99.8%的 TiO 和 95.5%的 WO 的比例从废水中被去除，这些 WO 和 TiO 存在于污泥中。活性污泥工艺也不会影响纳米颗粒的多晶型，因为 X 射线衍射显示存在投入到进水口的单斜 WO 和锐钛矿 TiO。纳米颗粒主要通过在活性污泥表面的生物吸附而被去除。总平板计数显示，在逐渐将纳米颗粒引入腔室的过程中，对照组和实验组中的细菌菌落数量相当。在曝气容器中，生物量>0.75 MLVSS/MLSS（混合液挥发性悬浮固体/混合液悬浮固体），因此，微生物在污泥中占更大的比例。废水中发现的 Ti 和 W 的较大比例主要是由于吸附在悬浮固体上的纳米颗粒所致，只有 3.6%的 Ti 和 28.6%的 W 是由于纳米颗粒的溶解。
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