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研究生:李駿智
研究生(外文):Lee, Jun-Chin
論文名稱:人工濕地承受高強度廢水之操作表現
論文名稱(外文):Performance of Constructed Wetlands Received Strong Wastewater
指導教授:李芳胤, 李志源
指導教授(外文):wen-chien, Kuo
學位類別:碩士
校院名稱:國立屏東技術學院
系所名稱:環境工程技術研究所
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:105
中文關鍵詞:人工濕地水力停留時間
外文關鍵詞:constructed wetlandshrt
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人工濕地具有大自然之物理、化學與生物間交互作用的功能,是一
種成本花費少、操作簡便以及維護管理容易的自然處理系統,已成功地應
用於處理各種低濃度廢水。 本研究主要目的是探討人工濕地在高濃度
有機負荷下(試驗污水取自小型養豬廢水經三段式處理後之放流水)其處理
潛能;同時比較二種植物(布袋蓮與爬拉草)之處理效果。實驗共分成兩
個部份,第一部份為現場之操作,以瞭解最佳負荷率與濾材之功能;第二
部份為室內之實驗,所得結果與現場操作比較,以確定植物對處理的差別
。 現場操作中之實驗設備共有三種,包括新建人工濕地、原有自由水
面人工濕地與實驗室規模人工濕地。在新建人工濕地方面,進行三個不同
停留時間(4.3、8.5、與14.7天)。結果顯示濕地系統對COD、BOD5、及SS
之去除率均達70%以上,其中,除COD有部份無法符合87年標準外,其餘二
項均可達到。至於氮、磷與DO改變並不明顯,ORP經處理後雖有提高,但
其數據都表示出系統處於厭氧態。在不同深度之操作表現亦有差異,上層
水位對各項水質處理情形大多比下層好。原有自由水面人工濕地共操
作66.5天及14.1天二種停留時間。結果指出有機物大多隨停留時間減少而
提高,其 總之,人工濕地在處理高強度廢水負荷下,對污染物去除是
以過濾與吸附作用之物理作用為主、其次為微生物之代謝作用與植物的功
能。由於物理作用顯著,固體沈澱累積速率高於水解速率,故濕地須定期
清洗濾料。至於微生物代謝作用則以甲烷化為主。硝化反應並不顯著,主
因為溶氧不足,因此欲有效去除氮量,有待進一步研究增強輸氧效率。
Artificial wetland, representing an important natural
process, has been used successfully in treating wastewater with
low concentrations of organic matters. This study, however, is
intended to evaluate the treatment capability of such a system
under conditions of high organic and nutrient loads. Two types
of wetland, i.e., subsurface flow and free surface systems were
constructed in field and in laboratory scales. With hydraulic
retention time (HRT) as a master process parameter, these
constructed wetla In the field-scale experiment with
subsurface flow wetland, three HRTs of 4.3, 8.5 , and 14.7 days
have been performed. The results showed that treatment
efficiencies of COD, BOD5, and SS were above 70%; except for
COD, two other parameters were able to meet the discharge
standard of the year 1998 . Removal mechanisms for those
pollutants primarily consisted of sedimentation, filtration ,
adsorption, and microbial oxidation. Indicated by the DO and
ORP, the wetland was in anaerobic conditions, which ren of 14.1
and 66.5 days were conducted for free surface wetlands. Results
showed that effluent quality was poorer than that in subsurface
system. From lab-scale wetland experiments, results indicated
that water hyacinth has better capability of transporting oxygen
and uptaking nutrients than brachiaria mutica . However, such
superiority was not obvious while the wetlands were subjected to
high loads such as swine wastewater. In conclusion, when
the wetlands are under heavy loads of organics and nutrients,
physical separations would be the most important mechanism for
removing pollutants, microbial metabolisms the next and plants
the least. Since rate of solids accumulation exceeds that of
solids hydrolysis, the wetlands should be cleaned once for about
4 to 5 years. As far as microbial metabolisms are concerned,
methanogenisis of organics is predominated while ammonia
nitrification has been inhibited on account of deficien
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