Applied Chemistry, National University of Science and Technology, Bulawayo, Zimbabwe.
Marine Biology Institute, Shantou University, Shantou, Guangdong Province, 515063, China; Applied Chemistry, National University of Science and Technology, Bulawayo, Zimbabwe.
J Environ Manage. 2018 Oct 15;224:182-190. doi: 10.1016/j.jenvman.2018.07.042. Epub 2018 Jul 23.
Sugarcane and bioethanol production produces large amounts of bagasse fly ash and vinasse, which are solid and viscous liquid wastes, respectively. However, these wastes are often disposed into the environment without treatment, thus posing an environmental and public health risk. This study investigated the treatment of vinasse effluent in terms of reduction of chemical oxygen demand (COD) and acidity removal using sugarcane bagasse fly ash. A maximum COD removal efficiency of 72% was obtained using an effluent volume of 100 mL, contact time of 180 min, and shaking speed of 240 rpm. The adsorbent dose and particle sizes were 4.5 g and 90-125 μm, respectively. Furthermore, the potential application of bagasse fly ash as an adsorbent in a sand filtration bed was assessed using a column test. A maximum recovery of 68% was obtained at the 25-min interval. The adsorption data was found to fit the Freundlich model best (K = 2.16 mg g; R = 0.96), and the kinetics fit the pseudo-second order model (R = 0.98).
甘蔗和生物乙醇生产会产生大量的甘蔗渣飞灰和酒糟，分别是固体和粘性液体废物。然而，这些废物通常未经处理就被排放到环境中，从而对环境和公共健康构成威胁。本研究探讨了利用甘蔗渣飞灰处理酒糟废水以降低化学需氧量（COD）和去除酸度。使用 100mL 废水体积、180min 接触时间和 240rpm 的摇床速度，可获得最大 72%的 COD 去除效率。吸附剂剂量和粒径分别为 4.5g 和 90-125μm。此外，还使用柱试验评估了将甘蔗渣飞灰作为吸附剂在砂滤床中的潜在应用。在 25 分钟的间隔内可获得最大 68%的回收率。吸附数据最符合 Freundlich 模型（K=2.16mg/g；R=0.96），动力学符合伪二级模型（R=0.98）。
