Abstract
A continuous fixed-bed column study was used to evaluate phosphate adsorption performance of U-D-Na which was functionalized by the cheap NaCl reagent after simple ultrasonic purification of diatomite. In this work, various effect factors, including flow rate, initial phosphate concentration, and the bed height, on breakthrough performance of fixed column were investigated. Experimental results demonstrated that the breakthrough time declined with the increase of inlet phosphate concentration and feed rate, whereas the increase of bed height turned out to significantly extend the breakthrough time. The dynamic adsorption process could be well fitted by the Thomas model, with a correlation coefficient R2 > 0.9000 under main operating conditions. A thrice loop of effective regeneration was achieved with 0.1 M hydrochloric acid eluent and deionized water. The maximum removal rate for phosphate was more than 95% in the column adsorption process. The results proved that U-D-Na could be used as a better alternative phosphate adsorbent for wastewater in a continuous column sorption process.
Highlights
Eutrophication caused by the high content of nutrients such as phosphate in water has always been concerning in the field of water treatment (Si et al 2000)
Natural diatomite used as the adsorbent precursor in this study was collected from the local province, Xundian, Yunnan, which could be developed for phosphate removal in water after simple modification treatment
The maximum absolute error among them was even reaching 57.67 min. These results demonstrated that the Yoon-Nelson model which ignored the properties of U-D-Na to describe the dynamic adsorption process is flawed
Summary
Eutrophication caused by the high content of nutrients such as phosphate in water has always been concerning in the field of water treatment (Si et al 2000). China's "Pollutant Discharge Standard for Municipal Wastewater Treatment. Plants" stipulated that the phosphate content in urban sewage discharge should be less than or equal to. The adsorption technology has been considered to be a potential option due to its simple operation, rapid adsorption performance, low cost, and high utilization rate of resources. This is of great significance in sewage treatment and environmental protection. This is of great significance in sewage treatment and environmental protection. (Cong et al 2014; Zhao et al.2018)
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