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The Feasibility Study of Ultrasound Assisted Decarbonating Process of Scaling Problem in Hot Spring Water
|上傳時間: ||2008-12-29 15:24:04 (UTC+8)|
There were three types of hot spring water in Taiwan, including chlorine salt type, carbonate type and sulfate salt type. When the hot spring water was delivered by pipeline system, the carbonate was easily precipitated in the pipeline and storage system, which considered as an essential problem for the owners of hot spring industry. These scaling problems corroded and damaged the pipes, leading the potential explosion problems. The major treatment methods were adding the chemical agents that contained the phosphorous and nitrate to inhibit the scaling, which caused the serious eutrophication problems in our natural environment. Replacing the pipes frequently was considered as a way to solve problems and free for chemical pollutants. However, the maintenance cost was huge and the wasted pipes were considered as an environmental issue. Therefore, in order to solve scaling problems with green technologies, this study applied ultrasound energy to the simulation process of hot spring delivery system. The increase/decrease of pH values were determined and the before/after concentrations of calcium ion were analyzed. Thus, the potential formation mechanisms of scaling in hot spring water and the performance of ultrasound assisted inhibition process were carefully examined.
The formation mechanisms of scaling in hot spring water: The experimental results indicated that the cations and anions were easily collided to form the precipitations under the lower flow rate. The reacted calcium concentrations were analyzed in low degree. However, the results were opposite under the higher flow rate. The reacted calcium concentrations were analyzed in high degree. Moreover, the same phenomena was observed and examined in the conditions of temperature changes. Higher temperature resulted in higher reacted calcium concentrations. Thus, it permitted that lower flow rate and temperature could form a stable reaction sites for cations and anions in hot spring water which resulted in high opportunity of scaling problems.
The performance of ultrasound assisted inhibition process: The results indicated that ultrasound assisted inhibition process of scaling problem was depended with flow rate and temperature. When the control system was under lower flow rate and temperature, the performance functioned well in inhibiting the scaling problems. However, the performance was not obvious under higher flow rate and temperature. The experimental results of this study are insufficient to conclude the optimization control conditions of ultrasound assisted inhibition process, which needs further researches and studies to fulfill the requirements.
|Appears in Collections:||[環境工程與科學系(所)] 博碩士論文|
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