Department of Chemical Engineering, Indian Institute of Technology, Roorkee, 247667 Uttarakhand, India.
Bioresour Technol. 2010 May;101(10):3474-83. doi: 10.1016/j.biortech.2010.01.002. Epub 2010 Jan 25.
Present study reports treatment of synthetic dairy wastewater (SDW) in terms of chemical oxygen demand (COD) removal by means of adsorption onto activated carbon-commercial grade (ACC) and bagasse fly ash (BFA). Optimum conditions for SDW treatment were found to be: initial pH approximately 4.8, adsorbent dose of 20g/l for ACC and 10g/l for BFA and contact time approximately 8h. Pseudo-second-order kinetic model was found to fit the kinetic data and Redlich-Peterson isotherm model was generally found to best represent the equilibrium data for SDW treatment by ACC and BFA. The change in entropy and enthalpy for SDW adsorption onto ACC and BFA were estimated as 125.85kJ/molK and 91.53kJ/mol; and 25.71kJ/molK and 17.26kJ/mol, respectively. The negative values of change in Gibbs free energy indicate the feasibility and spontaneous nature of the adsorptive treatment.
本研究报告了通过活性炭-商业级 (ACC) 和甘蔗渣飞灰 (BFA) 吸附去除合成乳制品废水 (SDW) 的化学需氧量 (COD) 的处理方法。发现 SDW 处理的最佳条件为：初始 pH 值约为 4.8，ACC 的吸附剂用量为 20g/l，BFA 的用量为 10g/l，接触时间约为 8h。发现准二级动力学模型能够拟合动力学数据，而 Redlich-Peterson 等温模型通常能够最好地表示 ACC 和 BFA 处理 SDW 的平衡数据。SDW 吸附到 ACC 和 BFA 上的熵和焓的变化分别估计为 125.85kJ/molK 和 91.53kJ/mol；和 25.71kJ/molK 和 17.26kJ/mol，分别。吉布斯自由能变化的负值表明吸附处理的可行性和自发性。
