| Summary: | 碩士 === 國立屏東科技大學 === 土壤與水工程國際碩士學位學程 === 105 === Applying aquaponics for different purposes have received much attention in recent years due to low-cost eco-technology, which provide significant economic benefits. Many studies have solved some scientific aspects of this technology; almost focus on productivity and commercial implementation. However, there is still a lack of the quality water research to support the development of aquaponics system. In this thesis, opportunities that have the potential to fill this gap have been identified by the monitoring of water quality parameters.
An experiment was conducted to assess the efficacy of water recycling in different development stages of tomato plants such as initial (S1), development (S2), mid-season (S3) and late season (S4). The tomato plants were cultivated on the floating bed with baked clay. A sturgeon tank and a hydroponics tank were connected by plastic pipes, 1-way valves, pumps and water freezers. The special instruments were established in inlet and outlet of sturgeon tank to detect parameters such as temperature, pH value, DO (dissolved oxygen), NH4+ (ammonium concentration) and EC (electrical conductivity).
The system revealed an advantage, which the other conventional methods still have limited being water temperature control. Results indicated sturgeon and tomatoes can survive and well grow around 21.6oC. NH4+ concentration was reduced by 96.15% after the absorbing process of the tomato roots. Although DO was not reclaimed higher after hydroponics tank due to a lack of the light access the tomato's roots, sturgeons were still fully provided oxygen via an air blow machine. The pH value maintained in arrange of 6.68 – 7.31 during the process being an evident to illustrate insignificant fluctuation about the life media of the organisms. Absorbing the toxic ion of the tomato roots contributed to improve water quality. An average reduction 78.72 µs/cm EC of the water after passing the tomato tank was recorded. Although the study achieved certain success, a perfect conclusion has yet to be shown by using recycled water. However, this thesis is definitely background for the future studies. Aquaponics are needed to research continuously to diversify treatment and recycled methodologies for sturgeon’s wastewater.
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