为了探究微电流电解技术去除养殖水体中氨氮的效果,试验以盐度为30‰(质量分数)人造海水为对象,设置了循环水温度、流速和电流密度3个参数以及对应参数的3个水平,探究其对氨氮去除率的影响。试验结果表明,在试验设置的温度(18、25、32℃...为了探究微电流电解技术去除养殖水体中氨氮的效果,试验以盐度为30‰(质量分数)人造海水为对象,设置了循环水温度、流速和电流密度3个参数以及对应参数的3个水平,探究其对氨氮去除率的影响。试验结果表明,在试验设置的温度(18、25、32℃)和流速(100、300、500 m L/min)条件下,循环水温度和流速的变化对氨氮去除率影响并不明显。试验设置的电流密度(20、40、60 A/m2)条件下,对氨氮去除率有明显作用,且电流密度越大,单位时间内氨氮去除速率越快。正交试验确定了最优去除条件为电流密度、水温和流速分别为40 A/m2、32℃、500 m L/min。通过能耗分析可知,在设定的参数范围内,不同温度条件下最低能耗条件为电流密度40 A/m2、流速300 m L/min,最低的能耗为21.26 Wh/kg。研究结果可以为微电流电解在海水循环水养殖中氨氮降解提供参考。展开更多
A photoacoustic （PA） spectrometer with H-type first longitudinal resonant cells for ammonia detection is developed. A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cel...A photoacoustic （PA） spectrometer with H-type first longitudinal resonant cells for ammonia detection is developed. A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cell surface, so that the short response time at the flow rate of 100 seem （standard cubic centimeter per minute） is achieved. The response time of 5 min and detection limit of 0.86 ppbv is reached for ammonia concentration measurement with a Teflon polytetrafluoroethylene （PTFE） cell. Further improvement could be expected when using a brass cell with a high quality Teflon fluorinated ethylene propylene （FEP） coating.展开更多
文摘为了探究微电流电解技术去除养殖水体中氨氮的效果,试验以盐度为30‰(质量分数)人造海水为对象,设置了循环水温度、流速和电流密度3个参数以及对应参数的3个水平,探究其对氨氮去除率的影响。试验结果表明,在试验设置的温度(18、25、32℃)和流速(100、300、500 m L/min)条件下,循环水温度和流速的变化对氨氮去除率影响并不明显。试验设置的电流密度(20、40、60 A/m2)条件下,对氨氮去除率有明显作用,且电流密度越大,单位时间内氨氮去除速率越快。正交试验确定了最优去除条件为电流密度、水温和流速分别为40 A/m2、32℃、500 m L/min。通过能耗分析可知,在设定的参数范围内,不同温度条件下最低能耗条件为电流密度40 A/m2、流速300 m L/min,最低的能耗为21.26 Wh/kg。研究结果可以为微电流电解在海水循环水养殖中氨氮降解提供参考。
基金This work was supported by the National Natural Science Foundation of China under Grant No.60677010.
文摘A photoacoustic （PA） spectrometer with H-type first longitudinal resonant cells for ammonia detection is developed. A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cell surface, so that the short response time at the flow rate of 100 seem （standard cubic centimeter per minute） is achieved. The response time of 5 min and detection limit of 0.86 ppbv is reached for ammonia concentration measurement with a Teflon polytetrafluoroethylene （PTFE） cell. Further improvement could be expected when using a brass cell with a high quality Teflon fluorinated ethylene propylene （FEP） coating.
