Performance of constructed wetlands on different loadings and operation conditions
Date Issued
2007
Date
2007
Author(s)
Hsu, Ning-Kuang
DOI
zh-TW
Abstract
Constructed wetlands have been identified as a potential wastewater treatment facility. We investigate the effect of constructed wetlands treating municipal wastewater in order to get the best effluent water quality and operation parameters. In this research, we built up a free-water-surface constructed wetlands at Tu-cheng pumping station in Taipei County and pumped municipal wastewater from the Tu-cheng wastewater canal. We set different inflows, water depths, area pollutant loading rates, and hydraulic retention times in this experiment. Three small units, including a marsh, a pond, and then another marsh unit, were combined together. We chose three aquatic plants of Taiwan to be the roles of macrophytes in this research, including the first two planted in the marsh area, Typha orientalis Presl and Hygrophila pogonocalyx Hayata, and the last one, Hydrilla verticillata Royle, planted in the pond area.
Removal rate of BOD is around 28~92﹪, SS is around 37﹪~83﹪, NH3-N is around 69~99﹪, TN is around 29~93﹪, TP is around 34~93﹪, ortho-P is around 45~97﹪,and TDP is around 34~96﹪. When water depth is 20 cm, removal rates of BOD, NH3-N, and TN are worse than when it is 10 cm water depth. But for TP, ortho-P, and TDP, removal rates are higher in 20 cm water depth than that in 10 cm water depth.
When BOD and TN area loading rate are rising to and respectively, and hydraulic loading rate is rising to , we can get the highest surface removal rate of BOD and TN. We did not find out the limit of area pollutant loading rate and hydraulic loading rate of TP in this research. The performance of Hygrophila pogonocalyx Hayata of treating BOD, nitrogen, and phosphorus is better than Typha orientalis Presl. When HRT is in 4 days, we can get effective and economical pollutant removal rate.
Subjects
人工溼地
都市污水
表面積污染負荷
水力停留時間
水力負荷
constructed wetlands
municipal wastewater
area pollutant loading rate
hydraulic retention time
hydraulic loading rate
Type
thesis
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