印刷電路板產業在顯影剝膜製程（Develop-etch-strip，DES）中會產生含有乙醇胺（MEA）的DES廢液，其為高濃度有機氮廢液。處理程序先以酸化混凝沉澱後再進入生物處理系統，然其酸化處理後仍含有高濃度的COD及氮，為確保廢水處理符合放流水標準與提升生物處理法之效率，本研究目的為評估此經酸化後之DES廢液的生物降解效能，利用循序批分式反應槽（SBR）與連續流反應槽（CSTR）進行處理並添加生物載體BioNET，以建立最佳操作條件。
好氧批次實驗結果顯示，當COD濃度高於500 mg/L，MEA產生之高氨氮濃度會抑制硝化作用。而在厭氧條件下，COD濃度為3、6、10 g/L，其所含之MEA可完全被降解，而MEA降解之副產物乙酸和氨氮須以礦化、硝化或脫硝方式去除。以好氧與缺氧/好氧（A/O）程序操作SBR，HRT為128小時，進流COD濃度為500 mg/L（Phase Ⅰ）與300 mg/L（Phase Ⅱ），COD去除率皆為80-90%，Phase Ⅰ操作之硝化效能於添加BioNET後有顯著的提升，而A/O較好氧程序有較佳之處理效率；Phase Ⅱ 之氨氮去除率較高，然硝酸鹽無法於A/O程序中經脫硝作用有效去除，總氮去除率為34%。以A/O CSTR在HRT為8小時下操作，COD去除率為92%，總氮去除率高於50%，進流COD濃度最高可達800 mg/L，缺氧槽之碳氮比為10時脫硝效能較良好，相比SBR有更高的汙染物去除力與較佳的出流水水質。此外，研究結果顯示添加BioNET有助於整體菌量和除氮效能的提升，但系統中降解COD和總氮主要由懸浮汙泥所貢獻。

Develop-etch-strip (DES) process in printed circuit board (PCB) manufacture produces wastewater containing high organic nitrogen, in which monoethanolamine (MEA) was the main COD and nitrogen source. The acids treatment was applied as pre-treatment processes, and the acidified DES wastewater was then treated by the biological treatment system. Acidified DES wastewater contained high concentration of COD and required low-strength wastewater for dilution, having problems to meet the discharge standard. In the study, the COD and nitrogen removal of acidified DES wastewater using biological treatment was investigated, and sequencing batch reactor (SBR) and continuous stirred tank reactor (CSTR) with BioNET bio-carriers were conducted to figure out the optimal operation condition.
According to results of batch experiments, inhibition on nitrification occurred when COD concentration above 500 mg/L, due probably to the high ammonium concentration released from MEA degradation. In the anaerobic experiment, MEA was degraded without inhibition at initial COD concentrations of 3, 6, 10 g/L, however, COD remained at high concentration as acetate, and ammonium as the end product.
As for SBR operation, 80-90% of COD removals could be achieved with the influent COD concentrations of 500 mg/L and 300 mg/L under aerobic and anoxic/oxic (A/O) condition. when influent COD concentration was 500 mg/L, nitrification improved after bio-carriers were added, and nitrogen removal increased in A/O period compared with aerobic period. There was complete oxidation of ammonium when the influent COD concentration was 300 mg/L, however, insufficient carbon source in the influent caused to incomplete denitrification, and the total nitrogen removal was 34%. Acidified DES wastewater treated by A/O CSTR in 8 hours of HRT could achieve 92% COD removal and above 50% TN removal, while the COD/NO3-N ratio of 10 during denitrification had completely nitrate reduction. The highest influent COD could attain 800 mg/L, showing better performance than SBR. In addition, the presence of BioNET was beneficial to the system and improved the nitrification performance.

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