Kinetic Model for Phosphorus Removal from the Pre-Dams by Rare Earth Adsorbent

Pre-reservoirs are small reservoirs having an average theoretical water retention time of a few days. They are situated immediately above the larger main reservoir or lake, whose nutrient loading it is their purpose to reduce. Rare earth sorbents were put into pre-dams to purify pollutants in water. A theoretical deduction showed that low-concentration phosphate adsorption process accorded with a second-order kinetic equation according to academic hypothesis. The result was validated by the phosphate adsorption onto rare earth adsorbent. The factor (m/V)b had the close relation with the adsorption speed and the adsorbent dosage, intensity exponent b=0.53 (0¿b¿1) in this test condition. All the results demonstrated that low-phosphate adsorption on the adsorbent surface was mono-layer chemisorption and that the hypothesis of kinetic inference was reasonable in pre-dams.