微电流电解去除养殖海水中氨氮效果  

Ammonia removal effect by using micro-current electrolysis in aquaculture saline water

作　　者：叶章颖[1] 裴洛伟 林孝昶 顾招兵[2] 王朔[1] 朱松明[1] 阮贇杰[1] 

机构地区：[1]浙江大学生物系统工程与食品科学学院,农业部设施农业装备与信息化重点实验室,杭州310058 [2]云南农业大学动物科学技术学院,昆明650201

出　　处：《农业工程学报》2016年第1期212-217,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：十二五科技支撑计划项目(2014BAD08B09);国家自然科学基金(31402348);中央高校基本科研业务费(No.2015QNA6006)

摘　　要：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。In recirculating aquaculture system（RAS）, the metabolites and residual feed of fish are the main sources of ammonia nitrogen. The biological filter is widely used to avoid the accumulation of ammonia nitrogen. Autotrophic nitrification plays an important role in biological filter. However, the proliferation period of autotrophic nitrification is relatively long, and susceptible to temperature; once the system fails to run, it takes a long time for nitrifying bacterial colony to recovery. In recent years, electrochemical oxidation technology has been applied to remove ammonia nitrogen. In this paper, the removal rates of ammonia nitrogen under different flow velocities, temperatures and current densities were investigated. The artificial wastewater with added ammonia nitrogen was used in this study.The salinity of wastewater was 30 ‰, and the initial concentration of ammonia nitrogen was 10 mg/L. The micro-current electrolysis system was placed in a climatic cabinet to obtain a desirable temperature. The prepared wastewater of 2 L was poured into a beaker and heated by a constant temperature magnetic stirrer. The wastewater was circulated between electrolysis cell and beaker using a peristaltic pump, and then the power supply was enabled10 min later. Various values of flow velocity（100, 300 and 500 m L/min）, temperature（18, 25 and 32 ℃） and current density（20, 40 and 60 A/m2） were used in the experiments, and the ammonia nitrogen concentration was measured every 15 min. Moreover, the optimal electrolytic condition was established by the orthogonal analysis. The energy consumption of removing ammonia nitrogen was also calculated. The results showed that the removal rates of ammonia nitrogen after 90 min with different flow velocity of 100, 300 and 500 m L/min reached 92.38 %, 95.15% and 93.27%respectively under the condition of 25 ℃ and 40 A/m2. Single factor analysis showed that the flow velocity had no significant effect on the removal rate. When the current density was 40 A/m2, the flow vel

关 键 词：养殖 电解 温度 养殖海水 氨氮 流速 电流密度 

分 类 号：TQ114.262[化学工程—无机化工]