「多層複合濾料水質淨化系統 (Multi-Soil-Layering system, MSL)」為日本於1990年研發之現地水質淨化技術，臺灣於2015年引進MSL技術，並嘗試研究將材料及施作方法在地化，至今已成功應用於臺灣甚至外島地區。MSL是一種現地自然淨化系統 (On-site Natural Treatment System, NTS)，各國目前廣泛應用於處理家庭生活污水及畜牧廢水等點源污染，亦可以使用於淨化河川、埤塘或水庫等。由於近年來國內有愈來愈多場址持續運行中，但MSL系統後續之穩定削減操作及維護仍不具體，本研究主要針對MSL系統暫停供水後的各項污染物削減成效來推斷後續的維護操作以及其恢復削減成效的時間，並透過更換系統內部材料來比較之間的差異性。本研究將比較傳統型MSL持續進水與間歇進水之差異，另外將滲透濾層 (Permeable Layer, PL)之細碎石更換成沸石、混合濾料層 (Soil Mixture Layer, SML) 之稻殼更換成木屑，並透過停滯進水觀察此系統之削減成效。經實驗結果得知，原MSL系統操作停滯7日以上會使系統削減不穩定，當中以依賴微生物菌分解之氨氮與硝酸鹽氮的影響最為明顯，整體需花5-7日恢復削減。系統更換成沸石的沸石型MSL間歇供水組（ZMSL-P, Zeolite MSL- Pause）能使磷酸鹽類、氨氮及硝酸鹽氮之削減更加穩定，減少至只需3-4日恢復削減，而系統更換成木屑的木屑型MSL間歇供水組（SMSL-P, Sawdust MSL- Pause）能使磷酸鹽類及硝酸鹽氮之削減更加穩定，但加劇影響氨氮與有機物之削減成效，需花6-8日恢復削減，故建議系統於污水入流不穩定之地區使用沸石型ZMSL來配置。若系統出現氨氮與有機物之削減成效下降，可能為微生物菌增生過量導致系統阻塞，則可操作停滯14日以上使微生物菌部分死亡剝落，嘗試恢復穩定削減成效。

"Multi-Soil-Layering system (MSL)" is an on-site water purification technology developed in Japan in 1990. Taiwan introduced MSL technology in 2015 and tried to study the materials and application methods locally. It has been successfully applied to Taiwan and even the outer islands. MSL is an On-site Natural Treatment System (NTS), which is widely used in various countries to treat point source pollution such as domestic sewage and livestock wastewater and can also be used to purify rivers, ponds, or reservoirs. As more and more sites are in continuous operation in China in recent years, the subsequent stable reduction operation and maintenance of the MSL system is still not specific. operations and the time it took to recover the cut effect and compare the differences by replacing the material inside the system. This study will compare the difference between continuous water inflow and intermittent water inflow of traditional MSL. In addition, the fine crushed stone in the permeable layer (PL) is replaced with zeolite, and the rice husk in the Soil Mixture Layer (SML) is replaced. Replace it with sawdust, and observe the reduction effect of this system through intermittent water feeding. According to the experimental results, if the operation of the original MSL system is stagnant for more than 7 days, the reduction of the system will be unstable. Among them, ammonia nitrogen and nitrate nitrogen matter that depend on the decomposition of microorganisms are the most obvious. It will take 5-7 days to restore the reduction. The zeolite MSL intermittent water supply group (ZMSL-P, Zeolite MSL-Pause) that replaced the system with zeolite can make the reduction of phosphate, ammonia nitrogen, and nitrate nitrogen more stable, and it only takes 3-4 days to restore the reduction, and the system Sawdust-type MSL intermittent water supply group (SMSL-P, Sawdust MSL-Pause) replaced by sawdust can make the reduction of phosphate and nitrate nitrogen more stable, but it will seriously affect the reduction effect of ammonia nitrogen and organic matter, and it will take 6-8 days To restore the reduction, it is recommended that the system be configured with zeolite ZMSL in areas where the sewage inflow is unstable. If the reduction effect of ammonia nitrogen and organic matter in the system declines, it may be due to the excessive proliferation of microbial bacteria, which may cause the system to block. The operation can be stagnant for more than 14 days to make part of the microbial bacteria die and peel off, and try to restore the stable reduction effect.

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