苦土和氧化镁处理氮磷废水的对比研究  

Comparison of magnesia and pure magnesium oxide to remove nitrogen and phosphorus from wastewater

作　　者：陈晓流[1,2] 曹敏[1,2] 刘云[2] 郝火凡[1] 董元华[2] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,南京210008

出　　处：《环境工程学报》2012年第4期1176-1182,共7页Chinese Journal of Environmental Engineering

基　　金：江苏省自然科学基金资助项目(BK2008499);国家自然科学基金资助项目(20907058)

摘　　要：分别采用苦土、纯氧化镁为沉淀剂对模拟高浓度氮磷废水(N/P=0.8)进行了脱氮除磷研究,比较了沉淀剂投加量、pH对2种沉淀剂处理氮磷废水的影响,对沉淀产物进行XRD分析,并进行了经济效益比较。结果表明,pH是影响2种沉淀剂处理氮磷废水的主要因素,随着pH的增加,脱氮除磷效果提高,在平衡pH为9～10之间时氮磷处理效果最佳,pH继续增加,由于磷酸镁沉淀的形成使得氨氮去除率降低。此外,处理相同的废水,苦土的最佳投加量要大于纯氧化镁,但是经济效益比较结果表明,以苦土为沉淀剂处理氮磷废水可大大降低处理成本。Industrial calcined magnesite powder was compared with pure magnesium oxide for phosphate and ammonium nitrogen removal to struvite at a molar N∶ P ratio of 0.8 from wastewater.The optimal pH and solid dosage were studied.The precipitates obtained were analyzed by X-ray diffraction.The results showed that pH plays an important role in the removal of phosphate and ammonium nitrogen from wastewater,with removal being more efficient in the pH region from 9 to 10.Although the dosage of industrial calcined magnesite powder needed is greater than that of pure magnesium oxide,it has considerable economic advantages.

关 键 词：苦土 氧化镁 氮 磷 废水 

分 类 号：X703[环境科学与工程—环境工程]