摘要
鉴于北京某养鸡场鸡粪发酵沼液氨氮浓度高的特点,采用了鸟粪石沉淀法对其进行处理。采用单因素和响应面实验的方式优化反应条件。通过单因素实验确定p H=10.0~10.5,n（Mg2＋）∶n（NH＋4）∶n（PO3-4）=1.3∶1∶1.1,反应时间为20 min,转速为300 r/min时,氨氮去除率最高,达到75.79%,通过响应面实验对所得最佳反应条件进一步优化,得出当p H=10.57,n（Mg2＋）∶n（NH＋4）∶n（PO3-4）=1.27∶1∶1.12时,氨氮去除率为75.81%。SEM及XRD分析表明沉淀主要成分为磷酸铵镁。
Struvite precipitation was adopted to treat the chicken manure fermented liquid from a chicken farm in Beijing. Single factor experiments and response surface experiments were designed to obtain ammonia removal. Effect of pH, value of n （Mg^2＋）：n（ PO4^3-）： n（ NH4^＋ ）, reaction time and stirring speed on removal ratio of ammonia nitrogen were investigated. The single factor test results showed that when pH = 10. 0 - 10. 5, n（ Mg^2 ＋） ： n（ PO4^3- ） ： n（ NH4^＋ ） = 1.3： 1. l ： 1, reaction time = 20 rain and stirring speed = 300 r/rain, the removal ratio of ammonia nitrogen reached 75.79%. The response surface experiments results showed that when pH = 10.57, n（Mg^2＋）：n（PO4^3-）：n（NH4^＋） = 1.27： 1.12： 1, the removal ratio of ammonia nitrogen was up to 75.81% . The best response surface experiments refined and validated the reaction conditions. The struvite precipitate under optimal conditions were characterized with SEM and XRD, and it＇s main composition is magnesium ammonium phosphate.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第7期66-71,共6页
Environmental Engineering
关键词
鸟粪石沉淀法
沼液
氨氮
单因素实验
响应面实验
struvite precipitation
biogas slurry
ammonia nitrogen
single factor experiments
response surface experiments
