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A study of electrochemical oxidation treatment on
Ammonium and nitrite removal rates
|摘要:||The main purpose of this research is to adopt electrochemical oxidation in aquaculture seawater directly and indirectly. By oxidation ammonium and nitrite and sterilization, the goal of the effective and rapid water purifying could be achieved.
The basic tests in real aquaculture seawater were first conducted. The test results showed that the better operational parameters were the graphite material of 1 piece in the anode and 1 piece in the cathode, the direct current of 7.5 A and the seawater flow rate of 7 L/min .The man-made simulated aquaculture seawater was then used to perform the basic test repeatedly. The material of the pole-plate and the partition-plate was graphite and the salinity of the simulated seawater was fixed at 25 ppt. The results of the repeated basic tests indicated that the optimum operational conditions were 6 cm of the gap between pole-plates ( partition-plates ), 9 of the pH value, 10 A of the direct current and 38.5 mA/cm2 of the pole-plate current density. When the flow rate of the simulated seawater was 7 L/min with the hydraulic retention time ( HRT ) 3.11 min, the average removal rates of ammonium and nitrite were 0.65 and 0.51 mg/L．min, 0.80 and 0.49 mg/L．min and 0.99 and 0.66 mg/L．min as both of the initial concentrations of ammonium and nitrite were 1 mg/L, 5 mg/L, 10 mg/L, respectively. It also demonstrated that the removal speed of ammonium was much faster than nitrite and the higher of the concentration of ammonium, the larger of the removal rate obtained.
The commercialized electro-coagulation machine was also used to perform the ammonium and nitrite removal in this research. Poor performance was obtained due to low current density 3.4 mA/cm2 and a large gap between pole-plates. But, the sterilization efficiency achieved 94％ as the direct current was 30 A.|
本研究以電化學氧化之方式，針對養殖海水之水質進行直接及間接氧化處理，藉以氧化銨及亞硝酸與殺菌，達到有效且迅速淨化水質之目的。 本試驗先以實際養殖海水進行基礎試驗，得知較佳之操作參數，為陽一陰一皆使用石墨作為極板材質，操作電流量及水流量分別為7.5 A及7 L/min。再以模擬養殖海水進行重複試驗驗證。本基礎試驗裝置在陽、陰極板與隔板材質均使用石墨，極（隔）板間距為6 cm，處理模擬養殖海水 (鹽度25 ppt)，pH值為9，於操作電流10A時，有效處理之極板電流密度為38.5 mA/cm2；在處理水流量7 L/min，其水力停留時間3.11 min時，處理銨及亞硝酸濃度為1 mg/L模擬水質時，銨之平均去除率為0.65 mg/L．min，亞硝酸之平均去除率為0.51 mg/L．min；處理銨及亞硝酸濃度為5 mg/L模擬水質時，銨之平均去除率為0.80 mg/L．min，亞硝酸之平均去除率為0.49 mg/L．min；處理銨及亞硝酸濃度為10 mg/L模擬水質時，銨之平均去除率為0.99 mg/L．min，亞硝酸之平均去除率為0.66 mg/L．min。模擬養殖海水試驗結果，顯示銨之去除速率較亞硝酸快，且調配之銨濃度越高，去除率亦越高。 本研究針對市售商品化之電凝機去除銨及亞硝酸測試結果，顯示效果不佳，推測原因為極板之電流密度過小僅約3.4 mA/cm2，且極板間距過大中間未置放隔板所致。但於操作電流30A時，其殺菌效率已達94％。
|Appears in Collections:||生物產業機電工程學系|
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