降低地下水中砷含量之方法比較

Comparison on Various Methods to Remove Arsenic in Groundwater

廖崇億(Chong-Yi Liao) ； 廖倍滋(Pei-Tzu Liao) ； 陳琦玲(Chi-Ling Chen)

《台灣農業研究》 65卷4期 (2016/12) Pp. 420-429

https://doi.org/10.6156/JTAR/2016.06504.07

摘要

地下水為台灣中南部主要灌溉水源之一，然因地質因素，地下水砷含量常超過灌溉水質標準 (0.05 mg L^(-1))。為提供農業安全的灌溉水質，並減緩土壤砷的累積，本研究試用多種移除砷之方法，包含化學混凝法、陰離子交換法、電凝法、吸附法，氧化沉澱法等，先在實驗室以小量從現地取回之灌溉水篩選砷移除效率較佳者，進行雲林東勢鄉和北港鎮之現場2 Mg 水量除砷之驗證。試驗與評估結果顯示，以化學混凝法、氧化沉澱法較有效益，依地下水砷濃度與處理方法差異約需1-30 d。但受限於農地不易提供反應的儲水設備空間，故此兩種方法以提供設施栽培或滴灌栽培等少量用水農法較為可行。

關鍵字

地下水 ； 砷 ； 化學混凝法 ； 氧化沉澱法

並列摘要

Groundwater is one of water resources for agricultural irrigation in Taiwan. However, the arsenic (As) content is higher than the As criteria of irrigation water (0.05 mg L^(-1)) in some locations. The objective of the study is to find out a better removal method to diminish As concentration in groundwater. The lab-scale tests were attempted to compare the effectiveness of different methods such as chemical coagulation, ion-exchange, electro-coagulation, absorption, and oxidation precipitation. Some removal tests based on the lab data were conducted with 2 Mg volume groundwater at field experiments. The results revealed that the ferric chemical coagulation and oxidation precipitation method had higher efficiency in field studies. It required 1-30 d to the whole course of treatment based on different methods. The storage facilities are necessary for field application so that these methods are suitable for greenhouse or drip irrigation.

並列關鍵字

Groundwater ； Arsenic ； Ferric chemical coagulation ； Oxidation precipitation