摘要
针对二级出水中氮、磷含量较高问题,对采用吸附法去除水中的氮、磷的天然吸附剂进行了改性和复合处理实验.结果表明,对天然沸石进行的四种改性方法中,改性效果排序为:盐热改性>盐改性>热改性>酸改性.经过盐热改性后的沸石脱氮能力提高了31.58%,最佳改性条件为:质量分数5.7%的NaCl改性2 h,500℃煅烧0.5 h.经复合后,改性沸石的除磷能力提高了68.35%,复合最佳条件为:LaCl3质量分数0.4%,复合时间1 h,200℃复焙烧失1 h.应用改性和复合后的吸附剂处理二级出水,可以有效地解决出水中氮、磷含量超标的问题.
To solve the problem of high-concentration nitrogen and phosphorus in secondary effluent, nature zeolite was modified and compounded to remove nitrogen and phosphorus by using adsorption process. Experimental results show that among these four modification methods, the modification effects can be seen as follows： salt and thermal modification 〉 salt modification 〉 thermal modification 〉 acid modification. After salt and thermal modification, the capability of ammoniacal nitrogen removal increases by 31.58 %. The optimal conditions of salt and thermal modification are modifying in NaCl solution of 5.7 % in mass fraction for 2 h, then 0.5 h calcination at 500 ℃ . After compounding, the capability of phosphorus removal increases obviously. The optimal conditions of compounding are compounding in LaCI3 solution of 0.4 % in mass fraction for 1 h, then 1 h calcination at 200 ℃. Using the modified adsorption martial to treat effluent from a secondary sedimentation tank, the problem of substandard nitrogen and phosphorus contents of effluent can be solved effectively.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2009年第5期551-556,共6页
Journal of University of Science and Technology Beijing
基金
国家"十一五"科技支撑计划重大资助项目(No.2006BAC19B01)
关键词
吸附材料
沸石
氨氮
磷
市政污水
zeolite
adsorption materials
ammoniacal nitrogen
phosphorus
municipal sewage
