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为探究电化学氧化法在工厂化循环水养殖系统中处理水质的效果及影响因素,本研究在前期试验得到的最佳条件(温度25℃、电流密度40A/m2、水流速度300m L/min)下,以不同初始氨氮浓度和固体悬浮颗粒物的模拟养殖水以及实际养殖水为研究对象,探讨了加入低压紫外汞灯后电解与紫外协同去除氨氮的效果。结果表明:电解紫外协同处理氨氮效果明显优于单独电解法,运用本系统处理氨氮初始浓度分别为4、7和10mg/L的模拟养殖水时,氨氮去除效率相对于单独电解时分别提高45.0%(p<0.05)、36.0%(p<0.05)和20.0%(p<0.05);电解紫外协同去氨氮效率受氨氮初始浓度、水体中的固体颗粒悬浮物、实际养殖水等因素影响,随着氨氮初始浓度及水体中固体悬浮颗粒物的升高,氨氮的去除效率降低,达到同种去除效率所需的时间延长,如本研究中当处理固体悬浮颗粒(SS)分别为100、150和200mg/L的模拟养殖水时,氨氮的去除效率随着SS的升高而降低,相对于仅含氨氮的模拟养殖水,氨氮的去除效率分别降低51.7%(p<0.05)、65.5%(p<0.05)和72.4%(p<0.05);在处理实际养殖水时,氨氮的去除速率明显降低,去除完全所需的时间延长,在本系统中电解紫外对氨氮、亚硝氮、固体悬浮颗粒物的去除具有较好效果,去除率分别为97.8%、96.9%和92.1%。
In order to explore the effects and influencing factors of electrochemical oxidation process on water quality in factory recirculating aquaculture system, the optimum conditions (temperature 25 ℃, current density 40A / m2, water flow rate 300m L / min) The effects of electrolysis and UV on the simultaneous removal of ammonia nitrogen after the addition of low pressure UV mercury lamp were discussed under different initial ammonia nitrogen concentration, simulated farming water with solid suspended particles and actual farming water. The results showed that the effect of ammonia-UV treatment was better than that of single electrolysis method. When this system was used to treat simulated farming water with initial ammonia concentrations of 4, 7 and 10 mg / L respectively, the ammonia removal efficiency increased by 45.0% (p <0.05), 36.0% (p <0.05) and 20.0% (p <0.05). The efficiency of EUV combined with ammonia removal was influenced by the initial concentration of ammonia nitrogen, suspended solids in the water and the actual culture water. The initial concentration of ammonia nitrogen and the increase of solid suspended particles in the water, the removal efficiency of ammonia nitrogen is reduced and the time required to achieve the same removal efficiency is prolonged. For example, when the SS value is 100, 150 and 200 mg / L, the removal efficiencies of ammonia nitrogen decreased with the increase of SS. Compared with the simulated farming water containing only ammonia nitrogen, the ammonia nitrogen removal efficiencies decreased by 51.7% (p <0.05) and 65.5% (p <0.05), respectively ) And 72.4% respectively (p <0.05). When the actual farming water was treated, the removal rate of NH3-N was significantly reduced and the time needed for removal was extended. In this system, the removal of ammonia nitrogen, nitrite nitrogen and suspended solids Have a good effect, removal rate respectively 97.8%, 96.9% and 92.1%.