「多層複合濾料水質過濾系統(multi-soil-layering system,MSL)」，為日本開發的一種現
地自然淨化處理系統(natural treatment system,NTS)，MSL 對於處理家庭生活污水、畜牧
污水或是河川污染上面顯示其卓越的淨化能力，內部材料為天然易取得之砂質土壤、稻
殼、鐵粒以及碳粒，MSL 槽體內部材料分為兩大部分，一為混合濾料層(Soil Mixing
Layer,SML)以及滲透過濾層(Permeable Layer,PL)，由於污水中營養鹽的削減必須藉由好
氧硝化菌行硝化作用後，再藉由厭氧脫硝菌來去除，然而污水中往往存在較低的溶氧
(Dissolved Oxygen,DO) ，而於系統內部曝氣較為費工且管線維護複雜，故本研究嘗試於
污水進入MSL 系統前，以前曝氣提高水中DO，藉此了解此預處理工序對MSL 水質淨
化之成效，實驗採用兩種濃度的生活污水，經實驗得知在濃度A 情況下MSL 本身削減
能力便足以負荷，而無須曝氣;而在濃度B 污水之實驗下，硝酸鹽氮在HLR=1500
L/m2/day 操作條件下，未曝氣時DO 為2.97mg/L 削減率為18.2%，在經過曝氣後DO 提
高至4.25m/L 後削減率提升為56.7%;化學需氧量在未曝氣DO 為3.14mg/L 時削減率為
78.6%，曝氣之後DO 提高至5.25mg/L 削減率為99.4%，透過預先曝氣污水可以針對水
中生化性反應削減物質如：氨氮、硝酸鹽氮、化學需氧量，透過曝氣達到提高削減效果。

Multi-Soil-Layering system (MSL) is a new on-site Natural Treatment System(NTS)
developed in Japan.The internal materials are natural and easily obtained,mainly
containing sandy soil, rice husks, iron particles and carbon particles. The internal
materials of the MSL tank are divided into two parts, one is the soil mixing block layer
(SML ) and permeable layer (PL). The reduction of nutrients in sewage must be nitrified
by aerobic nitrifying bacteria and then removed by anaerobic denitrifying bacteria， there
is often a lower dissolved oxygen (DO) in the sewage, and the system Internal aeration
is more labor-intensive and pipeline maintenance is complicated. Therefore, this study
tried to pre-aeration to increase the DO of the water before the sewage enters the MSL
system, so as to understand the effect of this pretreatment process on MSL water
purification. The experiment is divided into two concentrations. According to the
experiment,the reduction ability of MSL itself is sufficient to load under the condition of
low concentration.Nitrate nitrogen is at HLR=1500 L/m2/day,In the case of high
concentration without aeration DO is 2.97mg/L the reduction rate is 18.2%. After aeration,
DO is 4.25m/L reduction rate is increased to 56.7%.The highest inflow concentration of
COD without aeration DO is 3.14mg/L the reduction rate is 78.6%. After aeration，
Dissolved Oxygen is 5.25m/L reduction rate is increased to 99.4%.The pre-aerated sewage
can reduce substances such as NH4, NO3-N and COD for biochemical reactions in the
water, and the reduction effect can be improved through aeration.

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