| Summary: | 碩士 === 國立中山大學 === 海洋環境及工程學系研究所 === 96 === Recently, the use of constructed wetlands to treat nutritions and containing wastewater, has quite been in vogue. However, since salts aquacultural wastewater contains massive nutrients and salts, the common aquatic plant species are not suitable to treat it. Therefore the purpose of this research is mainly to use pilot-scale salty water constructed wetland systems operated under batch conditions to removal efficiency of nutrients.
The pilot-scale have nine pools, the influent was from discharge channels containing aquacultural wastewater and community sewage near by Dapeng Bay. The experiment designs altogether has four stages.In the first stage to the third stage, the HRT was continued at 7 days. Last stage, the HRT was continued at one month. Experimental period has used waste brick bat, oyster shell, 9mm stone and mix stone (9mm stone and 3mm stone mix) as filter medium. The 9mm stone pool and mix stone pool coordinates differently to test the stage planter differently to plant the species. The plant aspect has Avicennia marina(L2、L3 pool ), Lumnitzera racemosa and Phragmites australis. (First, the second stage plants the Phragmites australis , the third stage starts to plant Lumnitzera racemosa).
The experimental results showed that the filter media used with the mix stone presented the highest removal efficiency for the nutrients,whice the oyster shell exhibited the lowest removal efficiency for the nutrients. The oyster shell system was also found nutrients releaseal to the system. For using plants to remove the nutrients, we found that plants, did not show better performace than the systems without plants(p＞0.05). However, for the condition of vegetation, the plant species of Avicennia marina exhibited the best performace.
|
|---|
