- 期刊
添加稻殼炭並調整泥炭土擺放位置以降低植生滯留槽設置初期之高濃度出流
REDUCTION OF HIGH-CONCENTRATION EFFLUENT FROM A BIORETENTION UNIT AT ITS SETTING-UP STAGE BY ADDING RICE-HUSK CHARCOAL AND ADJUSTING THE LOCATION OF PEAT SOIL
摘要
近年來，台灣水庫管理單位為控制農業活動所產生之非點源污染，已逐漸使用植生滯留槽（Bioretention）作為削減非點源污染方法。但植生滯留槽在設置初期因其內部微生物反應及生物膜之削減機制不穩定，造成設置初期去除營養鹽效果不佳之情況。本研究設置四組植生滯留槽，分別為傳統植生滯留槽（對照組）、添加稻殼炭（實驗組A）、調整泥炭土擺放位置（實驗組B）、及添加稻殼炭和調整泥炭土擺放位置（實驗組C）3種設計，作為改善植生滯留槽設置初期去除營養鹽效果不佳之方案。檢測四組植生滯留槽設置2週、1個月、2個月、3個月之淨化水質成效。實驗結果顯示：四組植生滯留槽設置後對於削減懸浮固體成效皆呈現高達90%以上；正磷酸鹽方面，實驗組A、B、C明顯優於對照組，具有改善設置初期削減正磷酸鹽之成效；化學需氧量方面，四組植生滯留槽從設置後皆呈現相近成效；氨氮方面，雖設置2週後，對照組優於其他3組植生滯留槽，但隨著設置時間拉長，內部微生物處理系統逐漸穩定，四組植生滯留槽削減成效亦呈現相近趨勢。
並列摘要
In recent years, reservoir management authorities in Taiwan gradually adopted bioretention unit as a means and facility to reduce nutrients in flow caused by agricultural activities in order to maintain water quality in the reservoir. However, in the initial stage of installation, due to its internal microbial reaction and biofilm reduction mechanism, the bioretention unit often behaves unstable which caused the common problem of poor nutrient removal at the initial stage. In this study, four groups of bioretention units were set up, which were (1)regular bioretention tank (control group), (2)rice-husk charcoal added tank (experimental group A), (3)placement adjusted on peat soil tank (experimental group B), and (4)adding of rice-busk charcoal as well as placement adjusted on peat soil unit (experimental group C), as potential methods to improve the high nutrient outflow problem in the initial setting stage of a bioretention tank. Experimental results show that the four groups of bioretention tanks are more than 90% effective on reducing suspended solids. In the aspect of orthophosphate, the experimental groups A, B, and C are obviously superior to the control group, with better effect in the initial stage on reducing orthophosphate. For the performance on chemical oxygen demand, all four groups are similar. In the aspect of ammonia, although after the first two weeks, the control group was better than the other three groups, but after an elongated time, with the internal microbial system gradually stabilized, the reduction effect of all four groups also showed similar trends.