探討利用連續批次反應槽同時去除氨氮及硫酸鹽之可行性

Abstract

在我們日常生活中其實有很多廢水同時含有氨氮及硫酸鹽。以目前的處理程序看來，如果廢水同時含有氨氮及硫酸鹽時，較傾向於分開處理兩種汙染物，如此一來不僅耗時，更會增加操作時的成本。

在此研究中，我們建立了兩個體積分別為1公升以及1.2公升的連續式批次反應槽，並且利用合成廢水來操作同時去除水中的氨氮及硫酸鹽。進流水的氨氮及硫酸鹽濃度分別是 430 和 180 mg/L。在反應槽操作的同時，每天曝氬氣以維持厭氧狀態。反應槽的溫度是維持在攝氏35度，pH值介於 6.9 到 8.0 之間而水力停留時間則是 20 天。

從數據結果顯示，1升的反應槽能夠展現出 36.7% 的氨氮去除率以及5.5%的硫酸鹽去除率。而1.2升的反應槽則是有55% 的氨氮去除率以及15%的硫酸鹽去除率。

此研究顯示，將厭氧氨氧化細菌應用在一個單一的連續批次反應槽來操作同時去除硫酸鹽及氨氮的生物處理程序是可行的。

Many wastewaters contained nitrogen and sulfur compounds, which are threat to the environment. At present wastewater contaminated with these compounds are treated for ammonium and sulfate separately in two different processes, which consume more time and increase the treatment cost. In this study, simultaneous removal of ammonium and sulfate from the synthetic wastewater by anaerobic ammonium oxidizing (anammox) bacteria in two laboratory scale sequencing batch reactors (SBRs) with working volume of 1 L and 1.2 L were evaluated. The influent concentrations (mg/L) of ammonium and sulfate were 430 and 180, respectively. Argon gas was flushed every day in the reactor to maintain the anaerobic conditions in the SBR. The temperature, pH and hydraulic retention time (HRT) of the reactors were controlled at 35℃, 6.9 to 8.0 and 20 d, respectively. In this study, 36.7% and 55% of ammonium nitrogen removal efficiency with 5.5% and 15% of sulfate removal efficiency were achieved in SBR-1 and SBR-1.2, respectively. Presence of ferric ion in the influent negatively affected the performance of ammonium nitrogen and sulfate removal. A high free ammonia (FA) concentration (above 20 mg-N/L) also decreased ammonium nitrogen removal efficiency and nitrogen removal rate. Overall, the applicability of anammox bacteria in simultaneous removal of ammonium and sulfate from the wastewater in a single reactor was confirmed in this study.