Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, P.O. Srinivasanagar, Mangalore, 575025 D.K, India.
Department of Studies in Microbiology, University of Mysore, Mysuru, Karnataka, India.
J Environ Manage. 2019 Feb 15;232:236-242. doi: 10.1016/j.jenvman.2018.11.048. Epub 2018 Nov 23.
The investigation reports the application of biogenic jarosite, an iron hydroxy sulfate mineral in Fenton's Oxidation process. Ametryn, a herbicide detrimental to aquatic life and also to human is treated by Fenton's oxidation process using synthesized iron mineral, jarosite. The jarosite synthesis was carried out by using an isolated Acidithiobacillus ferrooxidans bacterial strain with ferrous as an iron supplement. The isolated strain was characterized by molecular techniques and biooxidation activity to ferrous to ferric iron was checked. On Fenton's treatment ametryn degradation upto 84.9% and COD removal to the extent of 56.1% was observed within 2 h of treatment and the reaction follows the pseudo first order kinetics with the curve best fit. The slight increase in kinetic rate constant on jarosite loading rate increase from 0.1 g/L to 0.5 g/L with HO dosage of 100 mg/L confirms that jarosite has a catalytic role in the removal of ametryn. Mass spectroscopy analysis of treated synthetic ametryn solution at various intervals reveal the degradation follows dealkylation and hydroxylation pathway with the formation of three major intermediate compounds discussed here.
该研究报告了生物成因黄钾铁矾在芬顿氧化过程中的应用。莠去津是一种对水生生物和人类都有害的除草剂，通过使用合成铁矿物黄钾铁矾进行芬顿氧化处理来处理莠去津。黄钾铁矾的合成是通过使用一种分离的嗜酸铁氧化亚铁硫杆菌菌株和亚铁作为铁补充剂来进行的。通过分子技术和生物氧化活性对分离出的菌株进行了表征，检查了亚铁向三价铁的转化。在芬顿处理中，莠去津在 2 小时内降解了 84.9%，COD 去除率达到了 56.1%，反应遵循准一级动力学，曲线拟合最佳。在 HO 剂量为 100mg/L 时，黄钾铁矾负载率从 0.1g/L 增加到 0.5g/L，动力学速率常数略有增加，这证实了黄钾铁矾在莠去津去除中具有催化作用。对不同时间间隔处理的合成莠去津溶液进行质谱分析表明，降解遵循脱烷基化和羟化途径，形成了这里讨论的三种主要中间化合物。
