TAILIEUCHUNG - Current Issues of Water Management Part 10

Tham khảo tài liệu 'current issues of water management part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Wetlands for Water Quality Management - The Science and Technology 169 vegetation component of the system. The chemical fertilizer upstream deteriorates the water quality WQ of the wetland. Construction of an artificial wetland in the vicinity of the natural one would restore the water quality standards. 0 1 2 3 X Fig. 5. The spatial distribution of the bad biomass after the system is run for a long period of time 3. Constructed wetlands for water pollution management These man-made wetlands are used to treat aquaculture and municipal water to regulate the water quality of shrimp ponds and manage pollution from pond effluents. The wetland treated effluents satisfy standards for aquaculture farms. Since the technology to use the constructed wetlands to treat waste water of high BOD5 is limited these are generally used to polish secondary effluents. Other applications of constructed wetlands are a to treat acid mine drainage b to treat storm water and c the enhancement of existing wetlands. The suggestion to use wetland technology for waste water treatment is attractive for both ecological and economic reasons. Constructed wetlands are efficient in removing pathogens 2 . It performs better than conventional waste water treatment methods although the lack of knowledge of principles of pathogen removal in plants hampers optimum performance. Interactions between soil matrix micro-organisms and plants and higher retention time of the waste water in these biologically complex systems make phyto-remediation more effective than conventional systems. Phyto-remediation involves complex interactions between plant roots and micro-organisms in the rhizo-sphere. The efficient functioning of wetland systems is hampered due to following factors High redox potentials Acidity of effluents i. e. low pH and Microbial degradation of organic substrates . BTEX petroleum-derived hydrocarbons HET phenols . Wetland systems efficiently treat water polluted by heavy metals .

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