不同分析方法測定養殖系統中之氨—氮及亞硝酸—氮的比較

A Comparison on the Ammonia-N and Nitrite-N in Aquaculture System Determined by Different Methods

黃美瑩(Mei-Ying Huang) ； 徐崇仁(Chung-Zen Shyu) ； 盧民益(Min-Yih Lu)

《臺灣水產學會刊》 23卷4期 (1996/12) Pp. 307-321

https://doi.org/10.29822/JFST.199612.0005

摘要

循環水養殖系統中，氨氮之去除相當重要，並常以沉浸式生物濾床除氨。生物濾床設計及操作之主要參數爲進流水之pH值及水力停留時間(HRT)。本研究以一小型生物濾床與一循環水養鰻系統並聯操作以探討進流水之pH值（6.5-8.0）及水力停留時間（10-50 min）對生物濾床除氨效率之影響。結果顯示氨氮去除率隨pH值及HRT之增加而增加，於pH值8.0及HRT 50 min時達最大值（91.2％）。但氨之毒性由分子態氨決定，而分子態氨之濃度隨氨濃度及pH值改變；因此，於一循環水養鰻系統中，其生物濾床之操作條件不可單純依據氨氮去除率決定，而必需一併考慮處理水之pH值及殘留於水中具毒性之分子態氨濃度。因此，若以符合鰻魚養殖系統之整體要求爲標準（pH值適當及分子態氨氮濃度低），則生物濾床之最佳操作條件爲pH 7.5及HRT 50 min。

關鍵字

氨－氮 ； 亞硝酸－氮 ； 養殖系統 ； 分析方法比較

並列摘要

Laboratory scale submerged biofilters were operated,in parallel with a recirculatingeel culture system,under the operating conditions of pH between 6.5 and8.0 and of hydraulic retention time(HRT)between 10 and 50 min.The ammoniaremoval ratio of the biofilters were investigated.The results showed that theammonia removal ratio increased when the pH values of influent increased from6.5 to 8.0 and the HRT increased from 10 to 50 min.The highest ammoniaremoval ratio was 91.2 % when the pH was at 8.0 and HRT was 50 min.For aneel culture system,the operating strategy of a biofilter would not be decidedsimply by the ammonia removal ratio,but together with the pH and toxic unionizedammonia residual.If the overall requirements of eel culture system,i.e.asuitable pH and a low unionized ammonia concentration in culture tank,wereconsidered then the most suitable operating condition would be the pH at 7.5 andthe HRT in 50 min.

並列關鍵字

Ammonia-N ； Nitrite-N ； Aquaculture System ； Analysis Methods