Performance of reclaimed water purification system: A case study in Kun Shan University

• Main Authors: Tsai-Ming Huang, 黃才銘
• Other Authors: Long-Full Lin
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/4mrrvq

碩士 === 崑山科技大學 === 環境工程研究所 === 103 === In this study, an existing drainage channels in the campus of Kun Shan University was used for the purification of reclaimed water. A total of 4 interception walls were installed cross the flow section, and different aquatic plants were grown to purify the water, including floating aquatic plants such as water lettuce (Pistia stratiotes L.), salvinia (Salvinia molesta D. S. Mitchell), as well as submergent aquatic plant, hornwort (Ceratophyllum demersum L.). A flow of 120 CMD reclaimed water was treated with a hydraulic retention time of 58.2 hrs. Water quality monitoring programs including water temperature, dissolved oxygen (DO), pH, chemical oxygen demand (COD), suspended solids (SS), ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, total nitrogen, orthophosphate, as well as total phosphate were measured weekly. System operation began from Nov. 2013 through Apr. 2015. The results obtained in this study were: After treatment, the DO in water was increased from 3.3 mg/L to 6.8 mg/L indicating an efficient aeration. After treatment, the performance of COD removal was 42% (27%~53%), SS removal was 80% (73.3%~87%), TN removal was 52% (34.6%~67.7%), and TP removal was 38.3% (28.1%~42.9%). In addition, after a total of 7 pebble filtration walls were constructed in the channel, the DO in the effluent was increased from 5.6 mg/L to 9.3 mg/L, and the levels of COD, nitrogen, and phosphate were reduced significantly, indicating an efficient water quality enhancement.