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年度	110	專案性質	實驗性質
專案類別	研究專案	研究主題	調查
申請機構	國立台灣大學	申請系所	生物環境系統工程學系
專案主持人	江莉琦	職等/職稱	副教授
專案中文名稱	農用渠道底泥重金屬傳輸機制與電解還原法整治技術之研析
中文關鍵字	重金屬、渠道底泥、序列萃取法、重金屬傳輸模式、電解還原法
專案英文名稱	The analysis of heavy metal transport mechanism and electrolytic reduction method for remediation of agricultural ditches
英文關鍵字	heavy metal, bottom mud, Sequential Extraction Procedures (SEP), heavy metal transport model, electrolytic reduction
執行金額	500,000元
執行期間	2021/1/1 至 2021/12/31
計畫中文摘要	農田重金屬污染的來源相當複雜，包含：不當搭排、灌溉用水、肥料施灑、 大氣落塵等，重金屬含量過高會影響作物收成與品質。重金屬進入自然水體後， 主要是以溶解態之自由離子或錯合物存在。溶解態的金屬離子會藉由沉澱、離子 交換、吸附或形成錯合物之形式保存於底泥中，即使水中重金屬濃度不高，底泥 也會因經過長時間的吸附及累積作用後，使重金屬在底泥中的濃度遠比在水中和 空氣中要高。目前全台約有一千多公頃平地農地受重金屬污染，主要集中在桃園、 彰化和高雄。 本計畫調查桃園三塊厝支線，進行水體與底泥重金屬採樣，分析水 體與底泥重金屬總量，進而建立水體-底泥重金屬傳輸模式，並研析電解還原法去 除底泥重金屬之成效。 研究結果顯示，三塊厝支線水體主要受銅、鎳、鋅之重金 屬污染，但只有銅超出灌溉水質標準(>0.2mg/L)。 底泥受鉻、銅、鎳、鉛、鋅之重 金屬污染，尤以銅離子污染最為嚴重， 其最高測得 81.46ppm，已超出底泥重金屬 管制標準銅濃度之下限值(50mg/kg)，底泥污染問題屬嚴重。 底泥電解還原結果顯 示，電解還原效率最低為 43.93%，最高為 97.52%，顯示電解還原法可有效地去 除底泥重金屬。 WASP 模式模擬結果顯示，三種重金屬濃度(銅、鋅、鎳)模擬變化皆說明模式 最下游(河段 7)在混和上游流下之受污染水時重金屬濃度將會最高。從電子廠放 流水口之下游區域重金屬濃度逐漸升高， 為污染三塊厝支線水體的主要來源之一。 模式模擬結果與採樣點實測資料之 MAPE 值為：銅=47.12%、鋅=26.62%、鎳 =36.66%，顯示模式模擬表現合理。 綜合以上之結論，本研究之研究成果可作為 未來決策者於改善現地及實務可行性之參考。
計畫英文摘要	The complex sources of heavy meatal pollution in agricultural lands include: inappropriate discharge, contaminated irrigation water, fertilizer application and atmospheric fallout. The excessive heavy metal concentration can affect crop production and quality. The heavy metals enter the water body and exist in dissolved free ions or complex forms. The dissolved metal ions can be stored in bottom mud via sedimentation, ion exchange, adsorption or conversion to complex. The concentration of heavy metal in bottom mud can be higher than in water and air due to the accumulation effect of heavy metal in bottom mud. In Taiwan, there are more than 1000 hectare of contaminated agricultural lands, which are mainly located in Taoyuan, Changhua and Kaohsiung. This project aims to investigate the agricultural ditches, Sankuaizho, in Taoyuan, conduct the water and bottom mud sampling for analyzing the heavy metal concentration in water and the bottom mud to establish the water-sediment heavy metal transport model, and further evaluate the effect of heavy metal desorption by the electrolytic reduction method. The research results show that the water body of the Sankuaizho is mainly polluted by heavy metals such as copper, nickel and zinc, but only copper exceeds the water quality standard for irrigation (>0.2 mg/L). The bottom mud is polluted by heavy metals, such as chromium, copper, nickel, lead and zinc, especially copper pollution is the most severe one. A maximum concentration of 81.46ppm was measured, exceeding the lower limit of copper concentration (50mg/kg) of the heavy metal control standard. The problem of bottom mud pollution is serious. The results of electrolytic reduction of bottom mud show that the lowest electrolytic reduction efficiency is 43.93% and the highest is 97.52%. It is shown that this experiment could effectively remove heavy metals from bottom mud. The simulation results of the WASP model show that the simulated changes of three heavy metal concentrations (copper, zinc, and nickel) all indicate that the highest concentration of heavy metals at the most downstream of the model (segment 7) will be seen when mixed with the polluted water from the upstream flow. The concentration of heavy metals gradually increased from the discharge outlet of the electronics factory. From this, it is known that the discharge water from the electronics factory is one of the main sources of polluting the water body of the Sankuaizho. The MAPE values of model simulation results and sampling point observations are: copper=47.12%, zinc=26.62%, nickel=36.66%. It shows that the WASP model performs well and reasonably. Thus, theresearch results of this study could be used as a reference for future decision makers to improve the water quality and solve the bottom mud issues.