摘要
对莱茵衣藻去除废水中氮磷的性能进行了研究,考察了初始氮磷浓度、氮磷比、光照条件、pH值和细胞固定化等因素对去除效率的影响.结果表明,莱茵衣藻对氮磷的去除率在初始氮磷浓度分别在55mg·L-1和7mg·L-1以下时接近100%,但初始氨氮浓度进一步升高至75mg·L-1以上时会导致氨氮去除率急剧下降至50%.当氮磷比为5:1和10:1时,衣藻在3d内完全吸收水体中的氨氮,而当氮磷比为25:1时则需要6d;3种氮磷比下衣藻基本上4d内能完全去除水体中的磷.2种光照条件下(L/D为24h:0h和12h:12h)衣藻对氮磷的去除率都能达到100%,但L/D为24h:0h时的去除速率更快.衣藻去除氮磷的最适pH范围为6～7.藻细胞固定化后对氨氮的去除能力显著提高,在初始氨氮浓度为75mg·L-1时去除率由游离细胞的50%提高到100%;对磷的去除率不变,但速率有所减慢.
Chlamydomonas reinhardti was employed to remove nitrogen and phosphorus from wastewater.The effects of initial NH 4＋-N and TP concentrations,N /P ratios,Light /Darkness ratios,pH and immobilization on the removal of NH 4＋-N and TP were evaluated.The results showed that C.reinhardti could almost 100% remove NH 4＋-N and TP as initial concentrations of NH 4＋-N and TP were no more than 55 mg·L-1 and 7 mg·L-1,respectively,whereas the removal ratio of NH 4＋-N decreased drastically to 50% with initial NH 4＋-N concentration coming up to 75 mg·L-1.Under N /P ratios of 5：1 and 10：1,C.reinhardti could completely remove NH 4＋-N within 3d,while 6 d was needed with N /P ratio being 25：1.Different from NH 4＋-N removal,the removal ratio of TP could reach almost 100% within 4 d under 3 N /P ratios.With L /D ratios of 24 h：0 h and 12 h：12 h,100% removal of NH 4＋-N and TP could be achieved by C.reinhardti,but the removal rate under L /D ratio of 24 h：0 h was relatively faster.The optimal pH range for C.reinhardti to remove NH 4＋-N and TP was 6-7.After immobilization,the ability of C.reinhardti to remove NH 4＋-N was significantly enhanced as the removal ratio of NH 4＋-N came up to 100% with initial NH 4＋-N concentration being 75 mg·L-1.The ability of immobilized C.reinhardti to remove TP kept stable,whereas the removal rate was slowed slightly.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第6期1489-1493,共5页
Environmental Science
基金
国家自然科学基金项目(30770340)
深圳市南山区科技研发项目(南科院2009030)
关键词
莱茵衣藻
氨氮
磷
污水处理
固定化
Chlamydomonas reinhardti
NH 4＋-N
phosphorus
wastewater treatment
immobilization
