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鸟粪石沉淀法处理鸡粪发酵沼液的试验研究
EXPERIMENTAL STUDY OF CHICKEN MANURE FERMENTATION LIQUID TREATMENT BY STRUVITE PRECIPITATION
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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。Abstract: 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 ( Mg2 + ) ∶ n( PO3 － 4 ) ∶ n( NH + 4 ) ，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( Mg2 + ) ∶ n( PO3 － 4 ) ∶ n( NH + 4 ) = 1. 3∶ 1. 1∶ 1，reaction time = 20 min and stirring speed = 300 r /min，the removal ratio of ammonia nitrogen reached 75. 79%． The response surface experiments results showed that when pH = 10. 57，n( Mg2 + ) ∶ n( PO3 － 4 ) ∶ n( NH + 4 ) = 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．
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