| 铁盐絮凝法从阳宗海湖水中除砷研究与现场扩大试验 |
| 摘要点击 1951 全文点击 1358 投稿时间：2014-05-16 修订日期：2014-08-05 |
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| 中文关键词 砷污染 絮凝法 三氯化铁 湖泊 阳宗海 |
| 英文关键词 arsenic contamination flocculation precipitation ferric choride lake Yangzonghai Lake |
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| 中文摘要 |
| 阳宗海是我国云南省第三大高原湖泊,2008年6月发现被砷污染,水质从Ⅱ类下降到劣Ⅴ类. 由于阳宗海面积有31 km2,蓄水量6.04亿m3,不可能实施传统除砷絮凝法中的预氧化及调pH值等操作,试验研究了直接对阳宗海砷污染湖水雾化喷洒FeCl3溶液除砷的工艺条件. 结果表明,对于pH 8.6的50 L湖水,FeCl3用量为1.62~3.20 mg·L-1即可达到95.1%~96.7%的除砷率. 在除砷反应中,湖水的pH值稳定不变,湖中鱼类的生存不受影响,且反应生成的沉淀物在954 d后于湖水中仍稳定存在,检测不出砷. 在现场1万m3和25万m3湖水中的扩大试验也取得了良好的除砷效果,为大型湖泊水体减污治理提供了典型实施范例. |
| 英文摘要 |
| Yangzonghai Lake is the third largest plateau lake in Yunnan province. In June 2008, arsenic contamination was detected in Yangzonghai Lake and the water quality worsens dramatically from standard grade Ⅱ to worse than grade V. Since Yongzonghai Lake is so large with the area of 31 km2 and the storage capacity of 6.04×108 m3, those pretreatment operations of the traditional arsenic removal methods, such as pre oxidation, adjusting pH value, are not applicable. In this study, a facile remediation strategy for arsenic removal by coagulation process, in which ferric chloride was directly sprayed into the contaminated water without any pretreatment, was reported. The results showed that the arsenic removal percentage was up to 95.1%-96.7% for 50 L raw water with reagent dosage of 1.62-3.20 mg·L-1. Furthermore, the pH value of the lake kept constant in the coagulation process, which was beneficial for fish survival. Re-dissolved arsenic from precipitation was not detected in 954 days. The strategy of ferric chloride coagulation were applied to field experiments for lake water with volumes of 1×104 m3 and 25×104 m3, in which arsenic was also removed effectively. The reported strategy was of great advantage for simple operation, low cost and ecological safety, therefore it provides a representative example for arsenic contamination treatment of large lake. |
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