澎湖烏崁海水淡化廠完工通水後不久所發現之輸配水延性鑄鐵管內水泥砂漿內襯剝落，用戶龍頭出現紅水等情事，經採水樣分析後，可確認係因逆滲透(RO)薄膜出水之鈣、鎂離子濃度、鹼度及TDS等偏低，為腐蝕性水質所導致。
　　為研究如何降低海淡廠出水之腐蝕性，本計畫劃先蒐集國內外公共給水對腐蝕性水質之處理方式，特別是海水淡化廠出水之後處理流程。其次實際採集烏崁海淡廠出水，分析其水質。首先藉由理論計算，預測欲達到穩定化防蝕水質所需添加之鹼劑種類及加量。並在實際添加藥劑後，分析水質，計算其腐蝕指標。同時製作與現場輸水管相同材質之金屬試片，依ASTM G31之「實驗室浸泡腐蝕試驗(Laboratory Immersion Corrosion Testings)」方式，實際量測經各種方式化學調理後水樣之腐蝕性，同時分別比較LSI(藍氏飽和指標)、RSI(Ryznar穩定指標)及CCPP(Calcium Carbonate Precipitation Potential, 碳酸鈣沉積潛能)與實測腐蝕速率之相關性。另外，亦將海淡廠出水流經填充不同粒徑大理石濾料之礦物塔，在不同接觸時間及二氧化碳添加量下，取處理水分析水質，再進行與前述添加鹼劑相同之浸泡腐蝕試驗。
　　根據本研究之結果，實驗室浸泡腐蝕試驗可有效地運用於海淡廠出水防蝕後處理程序之篩選。但在金屬試片與調理後水質之接觸反應槽內，應注意有適當之攪拌及溶氧之存在。比較「石灰及二氧化碳」、「碳酸氫鈉或碳酸鈉」及「礦物塔」等三種後處理方式之防蝕效果。石灰及二氧化碳為有效之調理方式，在石灰約60 mg/L加量下，加入足量之CO2，使pH值控制在8.0左右，可有良好之防蝕效果。一般而言，當調理後水質之腐蝕指標LSI(藍氏飽和指標) > 0.2，RSI(Ryznar 穩定指標) < 8及CCPP(碳酸鈣沉積潛能) > 0時，腐蝕現象可得到適當之抑制。單獨加碳酸氫鈉或碳酸鈉對腐蝕指標之提昇有限，且所需加量甚大，必須與石灰及二氧化碳共用方能達到適當之防蝕效果。經礦物塔調理之出水可得到與石灰-二氧化碳法相似之水質，因而有相似之防蝕效果。但礦物塔內之大理石填充料之粒徑大小對調理效果顯然有相當大的影響。再者腐蝕指標相同之水質，含鈣比例較高者，其防蝕效果較含鹼度高者為佳，推測應與材料表面碳酸鈣保護層形成有關。

　　Shortly after the inauguration of Wu-Kan seawater desalination plant in Peng-Hu, leaching of materials from cement-mortar linings of the ductile-iron pipes and complaints about red-water from the customers were reported. These were thought to be caused by the aggressive effluent from the RO membrane, which removed most ions from seawater.
　　The purpose of this research is to select the appropriate post-treatment processes to reduce the corrosiveness of the effluent from the desalination plant. First, the literature, concerned with the corrosion control for public water supply, especially for those involved with seawater desalination, was searched. Then the effluent from the Wu-Kan desalination plant was collected and the water quality analyzed. Based on the result from water quality analysis, the appropriate chemicals and dosage needed to restore its chemical stability were predicted theoretically. After chemical conditioning, the water quality was reanalyzed, and the values of various corrosion indexes were calculated.
　　Following the method “Laboratory Immersion Corrosion Testings,” of ASTM G31, the corrosion intensity of the post-treated water was measured. The coupons used in these tests were made of ductile iron. Then correlation between the various corrosion indexes, namely LSI (Langelier Saturation Index), RSI (Ryznar Stability Index), and CCPP (Calcium Carbonate Precipitation Potential), and the lab-measured corrosion rate were evaluated. In addition, alkaline media filter with marble as media and coupling with CO2 addition was also evaluated as alternative post-treatment process.
　　Based on the results from this study, the laboratory immersion corrosion testings are effective for evaluating various post-treatment processes for effluent from seawater desalination plant. However, attention should be paid to providing appropriate mixing and dissolved oxygen in the reacting vessel.
　　Comparing the corrosion inhibition efficiency of the three post-treatment processes, namely lime and carbon dioxide, sodium bicarbonate or carbonate, and alkaline media filter, the results show that lime and carbon dioxide process was very efficient. At Ca(OH)2 dosage of about 60 mg/L and adding sufficient amount of CO2 to keep pH value at about 8.0, the treated water, with LSI value at about 0.2, was chemically stable concerning corrosion.
　　Generally speaking, when the corrosion index of the post-treated water meets the following criteria: LSI 0.2, RSI 8, or CCPP 0, the corrosion rate is limited. Adding only sodium bicarbonate or sodium carbonate, even at very high dosages, was not very effective for corrosion control. These two alkaline agents must be coupled with lime and CO2 in order to adjust the value of corrosion index to the desired range. The water quality of the effluent from the alkaline media filter was similar to that from the lime-CO2 process, and therefore also demonstrated similar corrosion rate. However, the granular size of the alkaline media was found to have profound effect on the performance of the filter. Further, under similar value of corrosion index, the post-treated waters with higher calcium content were found to have lower corrosion rate than those with higher alkalinity value. This probably is related to the formation of protective calcium carbonate layer on metal surface.

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