Environmental Technology Division, Council of Scientific & Industrial Research, Central Leather Research Institute, Adyar, Chennai, India.
Environ Sci Pollut Res Int. 2012 Jun;19(5):1828-40. doi: 10.1007/s11356-011-0691-1. Epub 2011 Dec 30.
BACKGROUND, AIM, SCOPE: Treatment of wastewater has become significant with the declining water resources. The presence of recalcitrant organics is the major issue in meeting the pollution control board norms in India. The theme of the present investigation was on partial or complete removal of pollutants or their transformation into less toxic and more biodegradable products by heterogeneous Fenton oxidation process using mesoporous activated carbon (MAC) as the catalyst.
Ferrous sulfate (FeSO(4)·7H(2)O), sulfuric acid (36 N, specific gravity 1.81, 98% purity), hydrogen peroxide (50% v/v) and all other chemicals used in this study were of analytical grade (Merck). Two reactors, each of height 50 cm and diameter 6 cm, were fabricated with PVC while one reactor was packed with MAC of mass 150 g and other without MAC served as control.
The oxidation process was presented with kinetic and thermodynamic constants for the removal of COD, BOD, and TOC from the wastewater. The activation energy (Ea) for homogeneous and heterogeneous Fenton oxidation processes were 44.79 and 25.89 kJ/mol, respectively. The thermodynamic parameters ΔG, ΔH, and ΔS were calculated for the oxidation processes using Van't Hoff equation. Furthermore, the degradation of organics was confirmed through FTIR and UV-visible spectroscopy, and cyclic voltammetry.
The heterocatalytic Fenton oxidation process efficiently increased the biodegradability index (BOD/COD) of the tannery effluent. The optimized conditions for the heterocatalytic Fenton oxidation of organics in tannery effluent were pH 3.5, reaction time-4 h, and H(2)O(2)/FeSO(4)·7H(2)O in the molar ratio of 2:1.
背景、目的、范围：随着水资源的减少，处理废水已变得非常重要。在印度，存在难处理的有机物是满足污染控制委员会规范的主要问题。本研究的主题是通过多相芬顿氧化法，使用中孔活性炭（MAC）作为催化剂，部分或完全去除污染物，或将其转化为毒性更小、更可生物降解的产物。
硫酸亚铁（FeSO4·7H2O）、硫酸（36N，比重 1.81，纯度 98%）、过氧化氢（50% v/v）和本研究中使用的所有其他化学品均为分析纯（默克）。两个反应器，每个高度为 50cm，直径为 6cm，均由聚氯乙烯制成，一个反应器填充 150g 的 MAC，另一个没有 MAC 作为对照。
该氧化过程呈现出从废水中去除 COD、BOD 和 TOC 的动力学和热力学常数。均相和多相芬顿氧化过程的活化能（Ea）分别为 44.79 和 25.89kJ/mol。使用范特霍夫方程计算了氧化过程的热力学参数ΔG、ΔH 和ΔS。此外，通过傅里叶变换红外光谱（FTIR）和紫外可见光谱（UV-Vis）以及循环伏安法证实了有机物的降解。
异相催化芬顿氧化法有效地提高了制革废水的生物降解指数（BOD/COD）。制革废水异相催化芬顿氧化有机物的优化条件为 pH3.5、反应时间 4h、H2O2/FeSO4·7H2O 摩尔比为 2:1。
