钠型丝光沸石去除猪场废水中营养元素的试验研究

Nutrients Removal from Swine Wastewater by Natural Na-type Mordenite

以钠型丝光沸石为试验材料进行猪场废水同步脱氮除磷研究,考察了沸石投加量、吸附时间、pH、Ca2+和Mg2+浓度对钠型丝光沸石同步去除氨氮和磷的影响。结果表明,在沸石投加量为300g/L,pH为8.0～9.0,吸附时间为4h的条件下,钠型丝光沸石对氨氮的去除率达到92%,对磷的去除率达到86%。随着pH的升高,氨氮和磷的去除率均先升高再降低,氨氮的去除率在pH为8.0时达到最高,为90%;磷的去除率在pH为9.0时达到最高,为85%。Ca2+浓度的增加对沸石去除氨氮的影响不大,但对磷的去除效果影响较显著,在P与Ca的摩尔比为1∶6,pH为9.0时,磷的去除率达到88%。Mg2+浓度的增加对沸石去除氨氮和磷的效果影响较显著,在P与Mg的摩尔比为1∶4,pH为10.0时,废水中氨氮和磷的去除率达到93%和91%。

Taking Na-type mordenite as the experimental material, batch experiments were carried out to investigate the influence of mordenite dosage, reaction time, pH, Ca2＋ concentration and Mg2＋ concentration on simultaneous removals of nitrogen and phosphorus from actual swine wastewater. It showed that under the conditions of mordenite dosage of 300 mg/L, pH of 8.0 - 9.0 and adsorption duration of 4 h, the removal efficiencies of high-concentration ammonia and phosphate by mordenite could reach 92% and 86%, respectively. With the increase of pH, the removal efficiency of ammonia and phosphate increased firstly and then decreased. However, the removal efficiency of ammonia reached the highest value around 90% at pH of 8.0, with phosphorus removal efficiency reaching the highest value of 85 % at pH of 9.0. The effect of Ca2＋ concentration on ammonia removal was not obvious, but was significant for phosphate removal. At P：Ca molar ratio of 1：6 and pH of 9.0, the removal efficiency of phosphate could reach 88%. The effect of Mg2＋ concentration was significant for ammonia and phosphate removal. At P：Mg molar ratio of 1：4 and pH of 10.0, the removal efficieneies of ammonia and phosphate could reach 93% and 91%, respectively.