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 Application of eco-technology to protecting water resources: case study at urban lake in Danang city
Tác giả hoặc Nhóm tác giả: Phan Thi Kim Thuy, Tran Van Quang
Nơi đăng: Journal of Science and Technology, Vietnam Academic of Science and Technology; Số: 53 - 3A;Từ->đến trang: 85-90;Năm: 2015
Lĩnh vực: Môi trường; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This paper presents the results of current water quality and eco-technology solutions to protect urban lakes water sources in Danang city. Monitored results in the period from 2009 to 2014 showed that most urban lakes were polluted by the organic matters, lead to eutrophication, and the using value of lakes decreased significantly by time. The research results at urban lakes showed that: (i) constructed wetland combined with Canna Indica Balis and Arachis Pintoi plants has controlled polluted sources from the sewerage system and decreased the accumulation of pollutants in the lake. Hydraulic retention time (HRT): 0.5-1 day, Hydraulic load: 0.05 - 0.1 m3/m2.day; organic matter load: 1.0 - 1.5 gBOD5/m2.day; Nutrient load: 0.02 - 0.025 gN-NH4/m2.day; 0.03 - 0.05 gP-PO4/m2.day. The pollutants removal efficiencies of the model are as folows: BOD5 (60 - 70 %); N-NH4+ (50 - 60 %) and P-PO43- (60 - 70 %); (ii) floating vegetable islands (FVIs) combined with Canna Indica Balis and Eichhornia crassipes can absorb and metabolize organic matters and nutrients in the lakes. The removal efficiencies of organic matter (BOD5) and nutrients (N-NH4+, P-PO43-) by FVIs are 45 % and (50 %, 40 %) respectively; (iii) initial application was assessed with good evaluation from communities about its feasibility, effectiveness and especially beautiful landscape.
ABSTRACT
This paper presents the results of current water quality and eco-technology solutions to protect urban lakes water sources in Danang city. Monitored results in the period from 2009 to 2014 showed that most urban lakes were polluted by the organic matters, lead to eutrophication, and the using value of lakes decreased significantly by time. The research results at urban lakes showed that: (i) constructed wetland combined with Canna Indica Balis and Arachis Pintoi plants has controlled polluted sources from the sewerage system and decreased the accumulation of pollutants in the lake. Hydraulic retention time (HRT): 0.5-1 day, Hydraulic load: 0.05 - 0.1 m3/m2.day; organic matter load: 1.0 - 1.5 gBOD5/m2.day; Nutrient load: 0.02 - 0.025 gN-NH4/m2.day; 0.03 - 0.05 gP-PO4/m2.day. The pollutants removal efficiencies of the model are as folows: BOD5 (60 - 70 %); N-NH4+ (50 - 60 %) and P-PO43- (60 - 70 %); (ii) floating vegetable islands (FVIs) combined with Canna Indica Balis and Eichhornia crassipes can absorb and metabolize organic matters and nutrients in the lakes. The removal efficiencies of organic matter (BOD5) and nutrients (N-NH4+, P-PO43-) by FVIs are 45 % and (50 %, 40 %) respectively; (iii) initial application was assessed with good evaluation from communities about its feasibility, effectiveness and especially beautiful landscape.
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