金門地面水資源不足、且湖庫常有水質不佳的問題，影響當地供水的質與量，因此協議自大陸透過海底管線引水，作為自來水水源。引水工程自107年8月正式通水，原水經田浦受水池短暫停留後，抽往金門東部各淨水場(太湖淨水場、榮湖淨水場) 進行淨水處理。依各項水質檢測資料顯示，水質與微生物皆符合合約標準，然受水池仍不定期發生藻華現象，甚至長達數週。因此，本研究擬探討藻華之成因，以提供選擇控制技術之參考。
為瞭解水體在海底管線運輸過程中pH值的變化、水體鹼度的影響及大量鈣離子的引入對銅綠微囊藻生長的影響，本實驗在控制溫度和光照條件下，利用藻類批量進行了不同實驗條件來進行培養試驗。（1）不同pH值對於微囊藻之生長：情況研究設計了不同初始pH (pH6.5、pH7.6 及 pH8.5) 和固定pH (pH 6.5及pH8.5) 對微囊藻生長的影響。結果表明：藻類對水體pH 有較強的緩衝能力，可以通過自身增殖活動改變水體的pH，因而不同初始pH 對藻類生長的影響不明顯，但實驗過程中持續固定pH ，藻類的生長量較低。銅綠微囊藻（Microcystis aeruginosa）適宜的生長在中性或弱鹼性的環境 (pH7.6 及 pH8.5)生長，當環境水體偏酸性 (pH6.5)的情況下微囊藻生長速率較低但生長量並不受影響。另外在持續受pH值改變的情況下微囊藻會受到抑制的影響。（2）鹼度對於微囊藻之生長: 本研究以不同初始鹼度進行了批次實驗，結果表明微囊藻在高鹼度水體生長遲滯其比低鹼度短而最佳生長鹼度範圍為50mg/L CaCO3。（3）不同鈣離子濃度對於微囊藻之生長：本研究進行了室內模擬以不同鈣離子濃度的水進流之水庫對微囊藻的生長。實驗結果表明，微囊藻藻密度在鈣離子濃度25mg/L最高而隨著鈣離子濃度增加使微囊藻細胞形成群體產生微環境利於微囊藻的生長。另外透過批次實驗結果表明鈣離子最佳生長範圍為14-25mg/L。

Microcystis aeruginosa, a freshwater cyanobacterium, is commonly found as a dominant species in algal blooms in water lake and reservoirs. In natural water bodies, the eutrophication of water causes by many factors which from environmental pollution, rainwater runoff, etcetera, to form algal blooms and affect the water quality of the reservoir. Water sources of Kinmen, Taiwan suffered from insufficient quantity and polluted water quality. Therefore, the government initiated a project to import water from Mainland China and mainland water diversion project has been officially completed and in commissioned in August 2018. Presently, the raw water from the mainland was extracted from LongHu Reservoir, Jingjiang, Fujiang, is extracted, transported through a submarine pipeline, stored in the Tianpu Receiving Pond, and then pumped into the water treatment plants in Eastern Kinmen (Taihu and Ronghu) for water treatment and supply. According to the monitoring data of LongHu Reservoir, the water quality and cyanobacteria were all compliant with the contract standards, and however, cyanobacterial blooms were observed in the Receiving Pond from time to time, sometimes for several weeks. Therefore, Kinmen County Water Treatment Plant (referred to as the water plant) is interested in knowing the possible reasons to cause the blooms so that the water plant can find appropriate control solutions. This study was designed to find the most likely factors affecting the forming of algal blooms in the Receiving Pond. Literatures and information of the water diversion projects were collected, reviewed, and analyzed. Then laboratory cultured experiments were carried out to test a few probable factors relevant to bloom forming, including impact of pH, alkalinity, and calcium on the growth rate of Microcystis aeruginosa.
The experimental results show that cyanobacteria have a high buffering capacity for the pH of the water body, and it can change the pH of the water body through their own growth activities. Therefore, different initial pH has no obvious effect on the growth of cyanobacteria in the total amount of production, but the growth rates under controlled pH are low during the experiment. M. aeruginosa is suitable for growth in a neutral or weakly alkaline environment (pH 7.6 and pH 8.5). Under acidic condition (pH 6.5), the growth rate of Microcystis is low but it grows at normal growth rate when the environment turns neutral. For higher pH (>10.5), the growth of Microcystis was inhibited. Alkalinity was also found to affect the growth of Microcystis, with optimal growth alkalinity at 50mg/L CaCO3. The experiments for different calcium concentrations showed that the best growth condition for Microcystis is at concentration of 14-25 mg/L, and the capability to form colonies increased with increasing calcium concentration. However, forming larger colonies slowed down the growth of Microcystis. The findings of this study may provide useful insight for further design the cyanobacteria control measures for the Receiving Pond.

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