| 净化去除酸性废水中不同价态砷的研究 |
| 摘要点击 542 全文点击 1598 修订日期：1993-08-10 |
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| 中文关键词 酸性废水 净化处理 砷 |
| 英文关键词 acidic wastewater pollution control arsenic (As) iron salts neutralization |
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| 中文摘要 |
| 根据净化含砷废水的铁盐中和法。通过理论分析和实验表明,在Fe/As=0.5-6.0范围内,铁盐中和法对废水中3价砷的去除率较其对5价砷的去除率平均低约60%,证实了废水中的3价砷较5价砷难于去除。氧化剂选择研究表明,对于含砷量高的酸性废水,采用漂白粉[Ca(C10)2]氧化其中的3价砷最为适宜。对于含砷782.5mg/L,pH=1的酸性废水,采用氧化-铁盐中和法经一级处理后,废水中含砷量即可低于8mg/L.除砷率大于99%,二级处理后出水中砷含量即可低于国家排放标准(0.5mg/L)。 |
| 英文摘要 |
| ased on the process of iron salts neutralization to remove arsenic from wastewater,theoretical analysis and experiments indicated that, at a ratio of Fe/As=0.5-0.6, As(Ⅲ) was removed at a rate of about 60% lower than that of As (V),demonstrating that As(Ⅲ)was more difficult to be removed from wastewater than As(V).In a further study,it was found that it was most suitable to oxidize As (Ⅲ) in acidic wastewater containing a high level of arsenic by using a bleaching powder,Ca(ClO)2.For an acidic wastewater containing 782.5mg/L of As at pH=1, the oxidation/iron salts neutralization process used in a primary treatment produced an effluent containing less than 8 mg/L of As, with an arsenic removal of more than 99%.If followed by a further secondary treatment,the level of arsenic in the effluent produced would be lower than 0. 5 mg/L,i.e.,the national standard for its discharge. |
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