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Treatment of River Water by a New Constructed Free Water Surface Wetland

Congress: 2008
Author(s): Pei-Chu Chen, Yi-Chen Lee
DHV Planetek Co., LTD 4F, 505, Chung Shan Second Road, Kaohsiung 801, Taiwan, R.O.C. TEL: 886-7-2150508 FAX: 886-7- 2150516

Keyword(s): Artificial wetland; river water; ecological treatment
AbstractThe Application of an Artificial Wetland on the Treatment of River Water Der-Fong Juang1*, Pei-Chu Chen2, Yi-Chen Lee2 1 Department of Healthcare Administration, Mei-Ho Institute of Technology 24F, 230, Ming-Chuan Second Road, Kaohsiung 806, Taiwan, R.O.C. TEL: 886-8-7799821 ext. 8331 FAX: 886-8-7780657 E-mail: 2 DHV Planetek Co., LTD 4F, 505, Chung Shan Second Road, Kaohsiung 801, Taiwan, R.O.C. TEL: 886-7-2150508 FAX: 886-7- 2150516 Introduction: The artificial wetlands treatment technique has been applied to the river water purification for many years in several countries. Due to the river water quality in Taiwan becoming much worse in recent years, Environmental Protection Agency (EPA) has been actively propagating the natural and ecological treatment techniques for the purification of river water. Objectives: The artificial wetland is one of the natural and ecological treatment techniques promoted by EPA. Therefore, this article described the treatment efficiency and the landscape function of an artificial wetland built in the Chayi County of Taiwan. Methods: The total effective treatment area of this artificial wetland was about 2.0 hectares and the total retention time was about 4.0 days with the average daily flow rate of 3,600CMD. The wetland was separated into four subsequent parts. The first part was constructed to be a sedimentation area with the detention time of about 6 hours. The second part had an average depth of 0.6m and a retention time of about 10.5 hours. The total area of the third and the fourth parts was about 1.22 aches and the depth was 1.2m for each part. The total retention time of both parts was about 3.27days. The water samples from the influent and effluent of wetland were collected for analyses about twice per month. Results: This wetland received the river water with annual average BOD5, SS and NH4-N concentrations of 9.0mg/L, 10.7mg/L and 5.0mg/L, respectively. The results showed that the average removal rates of Total BOD5, SS and NH4-N were 45%, 65% and 53%, respectively. The relationships between effluent BOD concentration and BOD loading rate and between effluent NH4-N concentration and NH4-N loading rate were developed in this study. Conclusions: Apparently, this constructed artificial wetland has shown a good result on the purification of river water. Its specific landscape design has also created a perfect ecological environment and achieved a good ecological function by attracting many species of birds, fish and hydrophytes.
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