沸石负载高锰酸钾去除低浓度氨氮

通过静态吸附实验,考察了辽宁锦州某天然沸石负载高锰酸钾(下称复合沸石)对水中氨氮的去除效能。结果表明,复合沸石对氨氮的吸附能力较天然沸石有所降低,但仍保持优惠吸附。复合沸石对氨氮的吸附过程较好地满足Fruendlich等温吸附模型,其动力学特性与准二级动力学方程拟合度高。pH对复合沸石吸附氨氮的影响显著,最适pH为中性条件,在酸性或碱性条件下,复合沸石对氨氮的吸附能力均较低,这与氨氮在不同pH溶液中存在的形式有关。

Low concentration ammonia nitrogen removal by modified zeolite with potassium permanganate

Ammonia nitrogen removal from synthetic aqueous solutions by modified zeolite originated from Jinzhou County,Liaoning Province,China with potassium permanganate(referred to as the composite zeolite hereinafter) was investigated by using batch experiments.The results show that the adsorption was still favorable,even though the removal of ammonium by composite zeolite decreased. The adsorption equilibrium data of ammonium onto the composite zeolite fitted well to the Fruendlich isotherm models,and the adsorption kinetic data of ammonium onto the composite zeolite could be well described by a pseudo-second-order model.The effect of pH on the adsorption of ammonia was significant,and the optimum pH condition was neutral. Under acidic or alkaline conditions, the composite zeolite adsorption capacity of ammonia was low, which was related with the form of ammonia in solution of different pH.