Department of Civil Engineering, National Institute of Technology Calicut, Calicut, P.O. - 673 601, Kerala, India.
Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, P.O. Srinivasnagar, Mangalore, 575025, India.
J Environ Manage. 2024 Dec;371:123009. doi: 10.1016/j.jenvman.2024.123009. Epub 2024 Oct 30.
Design of cost - effective filtration unit was carried out to evaluate the efficiency of different filter media made of locally available materials to treat raw leachate. Four different filter media laterites, peat, bagasse and a mixture of all were considered as study filter media for the removal of Zinc, Nickel, Copper and Lead from raw leachate. The reactor exhibited a significant removal efficiency when the three-filter media were combined as a combination. A removal rate of around 83.0% and 64.12% was found for nickel and copper, respectively, with a combined filter medium. The order of heavy metal removal varied depending on the kind of filter media used. For combined filter media, the sequence was Ni > Cu > Pb > Zn. For bagasse filter media, it was Pb > Cu > Zn > Ni. For peat filter media, it was Ni > Cu > Pb > Zn. For laterite filter media, it was Zn > Cu > Ni > Pb. Insignificant removal of heavy metals was observed with bagasse in the current investigation and hence is not recommended for use as a filter medium. Pre-treated leachate was subjected to Fenton's oxidation and UV-Fenton's oxidation for organic matter removal. Green synthesized bleached laterite iron nanoparticles were used as a catalyst in the Fenton treatment. COD removal of 80.0% and 85.0% was observed with 0.5 g/L of nano iron catalyst and 500 mg/L of HO and 100 mg/L of HO on Fenton's oxidation and UV-Fenton's oxidation respectively. The synthesized particles were demonstrated to possess a catalytic function in the reduction of COD. Both Fenton's oxidation and UV-Fenton's oxidation exhibit pseudo-first-order kinetics with linear regression.
设计了经济高效的过滤装置，以评估由本地可得材料制成的不同过滤介质处理原渗滤液的效率。后来，四种不同的过滤介质红土、泥炭、甘蔗渣和它们的混合物被认为是去除原渗滤液中锌、镍、铜和铅的研究过滤介质。当三种过滤介质组合使用时，该反应器表现出显著的去除效率。使用组合过滤介质时，镍和铜的去除率分别达到 83.0%和 64.12%。重金属去除率的顺序取决于所使用的过滤介质的种类。对于组合过滤介质，顺序为 Ni > Cu > Pb > Zn。对于甘蔗渣过滤介质，顺序为 Pb > Cu > Zn > Ni。对于泥炭过滤介质，顺序为 Ni > Cu > Pb > Zn。对于红土过滤介质，顺序为 Zn > Cu > Ni > Pb。在当前研究中，甘蔗渣对重金属的去除作用不明显，因此不建议将其用作过滤介质。预处理后的渗滤液进行芬顿氧化和 UV-Fenton 氧化去除有机物。用绿色合成的漂白红土铁纳米粒子作为芬顿处理的催化剂。在芬顿氧化和 UV-Fenton 氧化中，分别使用 0.5 g/L 的纳米铁催化剂和 500 mg/L 的 HO 和 100 mg/L 的 HO，COD 的去除率分别为 80.0%和 85.0%。所合成的颗粒被证明在 COD 的还原中具有催化作用。芬顿氧化和 UV-Fenton 氧化都表现出准一级动力学，具有线性回归。
