Comparisons of Regeneration Methods Using Physical and Chemical Treatment for Phosphate Removal Restoration of Filter Media

Abstract

ABSTRACT:The purpose of this study is to find the regeneration method of filter media using physical and chemical treatment for restoration of phosphorus adsorption ability. The filtration material used in this study is called Adphos. In an experiment of heating treatment, re-used filter media is heated to a high temperature before the adsorption test. The results show that the PO4 3--P adsorption capacity is in the range of 0.0021 -0.0030 mg/g and the removal efficiency is in the range of 26.1 -39.4%. In the experiment of acid or basic treatment, re-used filter media is exposed to a different pH condition before the adsorption test. The results show that the PO4 3--P adsorption capacity is in the range of 0.0010 -0.0066 mg/g and the removal efficiency is in the range of 15.8 -87.1% after the acid treatments which have pH values of 1 -5. However, after the basic treatments which have pH values of 8 -11, the results show that the PO4 3--P adsorption capacity is in the range of 0.0018 -0.0034 mg/g and the removal efficiency is in the range of 26.7 -48.0%. In an experiment of chemical treatment using NaCl, re-used filter media was exposed to a different NaCl concentration before the adsorption test. The results show that the PO4 3--P adsorption capacity is in the range of 0.0036 -0.0050 mg/g and the removal efficiency is in the range of 50.5 -71.1%. In conclusion, chemical treatment using NaCl shows a high recovery probability of phosphorus adsorption ability of filter media.

Phosphate Adsorption Characteristics of a Filter Medium, Adphos, and Its Efficiency by the Filtration Experiment Combined with the Vegetation Mat

“…Table 1. Chemical composition of the filter media, Adphos, used in this study (Kim et al 2016 (Lee et al 2009, Hong et al 2010.…”