Phosphates in wastewater at elevated concentrations cause eutrophication of water bodies and their removal from treated wastewater is essential before effluents are discharged to the environment. Phosphates are predominately removed during wastewater treatment by chemical precipitation which is usually expensive and has a significant environmental footprint. The purpose of this study was to investigate the effectiveness of waste recycled bricks as adsorbent for phosphate removal during wastewater treatment. The kinetics, isotherms, and thermodynamics of adsorption were investigated to establish the mechanisms of adsorption. The results showed that adsorption capacities increased with an increase in contact time, adsorbent dosage, and initial phosphate concentration. The kinetic study indicated that adsorption was governed by several mechanisms with various processes dominating different stages of the adsorption. The adsorption process was better represented by the pseudo-second-order kinetics and the Langmuir isotherm adequately described the adsorption of phosphates onto brick particles with a maximum adsorption capacity of 5.35 mg/g. The thermodynamic studies showed that the adsorption process was exothermic and proceeded spontaneously, demonstrating that waste bricks can be used as a sustainable alternative for the effective removal of phosphates from wastewater.

中文翻译：

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使用再生砖废物从模型废水中吸附磷酸盐的动力学，等温线和热力学模型

高浓度废水中的磷酸盐会引起水体富营养化，在将废水排放到环境中之前，将其从处理过的废水中去除是至关重要的。在废水处理过程中，磷酸盐主要是通过化学沉淀法去除的，化学沉淀法通常很昂贵，而且对环境的影响很大。这项研究的目的是研究废再生砖作为废水处理过程中磷酸盐去除吸附剂的有效性。研究了吸附的动力学，等温线和热力学，以建立吸附机理。结果表明，吸附能力随接触时间，吸附剂剂量和初始磷酸盐浓度的增加而增加。动力学研究表明，吸附受多种机理支配，不同过程主导着吸附的不同阶段。准二级动力学更好地代表了吸附过程，Langmuir等温线充分描述了磷酸盐在砖颗粒上的吸附，最大吸附容量为5.35 mg / g。热力学研究表明，吸附过程是放热的，并且是自发进行的，表明废砖可以用作有效去除废水中磷酸盐的可持续替代方法。准二级动力学更好地代表了吸附过程，Langmuir等温线充分描述了磷酸盐在砖颗粒上的吸附，最大吸附容量为5.35 mg / g。热力学研究表明，吸附过程是放热的，并且是自发进行的，表明废砖可以用作有效去除废水中磷酸盐的可持续替代方法。准二级动力学较好地表示了吸附过程，Langmuir等温线充分描述了磷酸盐在砖颗粒上的吸附，最大吸附容量为5.35 mg / g。热力学研究表明，吸附过程是放热的，并且是自发进行的，表明废砖可以用作有效去除废水中磷酸盐的可持续替代方法。