改性活性氧化铝吸附去除水中痕量磷的性能

Adsorption Performance of Trace Phosphorus Removal by Modified Active Aluminum Oxide

为了获得更为高效的去除水中痕量磷的方法,通过静态吸附试验考察了经Al_2(SO_4)_3或Na_2SO_4改性的活性氧化铝(γ-Al_2O_3)吸附除磷性能,观察了吸附剂投量、pH值及水温变化对PO_4~3-P去除效果的影响及改性前后的γ-Al_2O_3对模拟水样中不同形态磷的去除效果.结果表明:γ-Al_2O_3经Al_2(SO_4)_3或Na_2SO_4改性后对PO_4~3-P的去除效果比改性前有显著提高,对PO_4^(3-)-P的去除率分别提高了18.53%和14.34%;改性γ-Al_2O_3对PO_4^(3-)-P的去除率在-定的投量范围内随投量的增加明显提高;改性γ-Al_2O_3对PO_4^(3-)-P的吸附作用以物理吸附为主,随着温度和pH值的升高,除磷效果均呈下降趋势;经Al_2(SO_4)_3改性的γ-Al_2O_3表现出更好的除磷效果和较强的水质适应性;水中浊质对吸附除磷效果影响较大,因此γ-Al_2O_3更适合滤后水的深度除磷.

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. Results show 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.