自經濟及操作便利性考量，河川水質淨化廠場址設置於離污染河段之地點越近越好，然而，台灣地區有許多污染河川之四周往往缺乏可興建處理廠之用地；本研究即提出適用於腹地有限之河川的水質淨化處理系統。研究成果顯示，礫間接觸氧化工法（水力停留時間HRT為8小時）可去除BOD、SS及NH3-N達60%，另一種工法為氧化渠處理系統（HRT為2天）則可去除此類污染物達90%以上。本研究係採用一種淺床式礫間接觸氧化工法，包括兩種床深模式：50及60公分高，礫間接觸槽充填10至20公分之天然礫石，礫間槽之孔隙率約40%。為克服河川腹地有限之問題，礫間接觸槽設計成狹長型以利設置於河堤上，其中1至1.5公尺寬之槽體部分，係設置於由懸臂鋼樑支撐而伸向河面之平台上，懸臂鋼樑之另一端固定於河堤之擋土牆上。礫間接觸氧化系統之進流量設計自1500至10000 cmd。本研究亦提出另一種傳統工法－氧化渠處理系統，渠道內裝置轉動式曝氣機循環流動污水，渠道深為1.5公尺。由於無腹地，氧化渠則設置於特別設計之河面鋪蓋板上。本研究之氧化渠工法可處理進流BOD負荷達300 mg/L，SS達200 mg/L，本處理系統之設計進流量自5000到10000 cmd。 For economic reason and operation convenience, the river water treatment plant is better siting by the location of polluted stream as near as possible. However, the surroundings of some polluted streams in Taiwan have no available lands for construction of conventional water treatment facilities. This study is attempted on developing the feasible treatment methods for polluted river water in case of land-limited condition. The removal of BOD, suspended solids, and NH3-N in the influent of river water, with hydraulic retention time of 8 hours, are up to 60% by a gravel-contact oxidation process and more than 90% removal (HRT is 2 days) by the oxidation ditch system. The gravel-contact oxidation chamber is selected with a shallow bed in two patterns that is 50 and 60 cm in depth, respectively. Natural gravels sizing from 10 to 20 cm are filled in the gravel-contact bed with porosity around 40%. To overcome the land-limited problem, the gravel-contact oxidation chamber is designed a long-and-narrow tank for availably placing it along the riverbank. 1 to 1.5 m in width of the chamber is designed to be constructed on a platform supported by particular cantilever steel-beams. One end of the cantilever beam is fixed to the retaining wall, while the other end is free above the river. The influent flowrates of gravel-contact oxidation system are designed from 1500 to 10000 cmd. This study also provides another conventional treatment system－oxidation ditch. It consists of an oval-shaped channel in 1.5 m deep with rotor aerators across the ditch. Due to the limitation of land area surrounding the river, the oxidation ditch is constructed on a special decking system across over the river. The oxidation ditch can treat polluted water in this study with a loading of BOD up to 300 mg /L and SS up to 200 mg /L, and designed flowrates are from 5000 to 10000 cmd. 研究期間：9508 ~ 9606
