Adsorptive Removal of Phosphate From Wastewater Using Ethiopian Rift Pumice: Batch Experiment

IF 3.5 Q2 ENVIRONMENTAL SCIENCES
Yohannis Fetene, T. Addis
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引用次数: 9

Abstract

Phosphorous from municipal and industrial wastewater is the main cause of eutrophication of rivers and lakes, because effluent quality from conventional secondary wastewater treatment plants does not meet the discharge standard that demands further treatment. Therefore, we investigated pumice as a potential low-cost adsorbent for the tertiary treatment of phosphate from municipal wastewater. The phosphate adsorption process reached equilibrium after 60 minutes contact time and achieved a removal efficiency of 94.4% ± 0.7% for an adsorbent dose of 10 g/L in 3 mg/L phosphate solution. The highest phosphate removal was recorded at pH 7. The experimental data best fitted with the Redlich-Peterson isotherm and the pseudo-second-order kinetic models. The coexisting anions decreased phosphate adsorption in the order of mixture >SO42– > HCO3− > NO3− > Cl− > CO3−. Pumice removed 95% ± 0.2% of phosphate from effluents of the secondary treatment unit of a municipal wastewater treatment plant. Furthermore, effective regeneration of saturated pumice was possible with a 0.2 M NaOH solution. Therefore, pumice could be a technically workable low-cost reusable adsorbent for phosphate removal from wastewater as a tertiary treatment to curb eutrophication of surface waters. However, further column adsorption study is recommended for a continuous flow system to optimize process design variables and scale up for field applications.
埃塞俄比亚裂谷浮石吸附去除废水中的磷酸盐:间歇试验
城市和工业废水中的磷是导致河流和湖泊富营养化的主要原因,因为传统的二级污水处理厂的出水质量不符合排放标准,需要进一步处理。因此,我们研究了浮石作为一种潜在的低成本吸附剂,用于城市污水中磷酸盐的三级处理。磷酸盐吸附过程在60后达到平衡 分钟的接触时间,并获得94.4%的去除效率 ± 0.7%,吸附剂剂量为10 g/L,3 mg/L磷酸盐溶液。pH值为7时磷酸盐去除率最高。实验数据与Redlich-Peterson等温线和拟二阶动力学模型最为吻合。共存的阴离子降低了磷酸盐的吸附,其顺序为混合物>SO42- > HCO3− > NO3− > Cl− > CO3−。浮冰去除率95% ± 城市污水处理厂二级处理装置废水中0.2%的磷酸盐。此外,使用0.2 M NaOH溶液。因此,浮石可以作为一种技术上可行的低成本可重复使用的吸附剂,用于废水中的磷酸盐去除,作为抑制地表水富营养化的三级处理。然而,建议对连续流系统进行进一步的柱吸附研究,以优化工艺设计变量并扩大现场应用规模。
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来源期刊
Air Soil and Water Research
Air Soil and Water Research ENVIRONMENTAL SCIENCES-
CiteScore
7.80
自引率
5.30%
发文量
27
审稿时长
8 weeks
期刊介绍: Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.
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