Adsorption Performance of Trace Phosphorus Removal by Modified Active Aluminum Oxide

Performance of phosphorus removal of active aluminum oxide(γ-Al₂O₃) modified by Al₂(SO₄)₃ and Na₂SO₄ was studied by static adsorption experiment in order to develop a more effective method of trace phosphorus removal in water.Influences of adsorbent dosage, pH value and water temperature on phosphorus removal were observed, and removal effects of different phosphorus forms in simulated water samples using γ-Al₂O₃ before and after modified were investigated.Resultsshow that phosphorus removal effects of γ-Al₂O₃ modified by Al₂(SO₄)₃ and Na₂SO₄ are improved remarkably.Phosphorus removal rates increased with 18.53 and 14.34 percentage points separately.Phosphorus removal efficiency is clearly improved with increasing dosage of modified γ-Al₂O₃ in a certain dosage range.Phosphorus adsorption action of modified γ-Al₂O₃ mainly relies on physical adsorption.Phosphorus removal effects decrease with the increases of temperature and pH value.The γ-Al₂O₃ modified by Al₂(SO₄)₃ displays better effects on phosphorus removal and better adaptability on water quality.The effects of adsorption phosphorus removal are influenced greatly by turbid matters in water.Therefore, the γ-Al₂O₃ adapts better to advanced phosphorus removal of filtered water.