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    Process for the removal and destruction of perchlorate and nitrate from aqueous streams
    1.
    发明授权
    Process for the removal and destruction of perchlorate and nitrate from aqueous streams 有权
    从水流中去除和破坏高氯酸盐和硝酸盐的方法

    公开(公告)号：US6066257A

    公开(公告)日：2000-05-23

    申请号：US128569

    申请日：1998-08-04

    申请人： K. Raman Venkatesh ,  Eve R. Cobes ,  Dale Lee Jennings ,  Norman J. Wagner

    发明人： K. Raman Venkatesh ,  Eve R. Cobes ,  Dale Lee Jennings ,  Norman J. Wagner

    IPC分类号： B01J49/00 ,  C02F1/32 ,  C02F1/42 ,  C02F1/44 ,  C02F1/58 ,  C02F3/00 ,  C02F3/04

    CPC分类号： C02F3/00 ,  B01J49/0073 ,  C02F1/42 ,  C02F1/583 ,  C02F1/32 ,  C02F1/441 ,  C02F2103/06 ,  Y10S210/903

    摘要： A process for concentrating and destroying the perchlorate and nitrate anions present in ground water and drinking water sources is disclosed. In the process, the perchlorate and nitrate anions present in feed water are concentrated into a much smaller effluent stream. A typical process configuration involves using a continuous contacter apparatus known as ISEP wherein the perchlorate present in feed water is adsorbed on to an ion-exchange resin resulting in a perchlorate-free treated water. The ISEP unit also incorporates a regeneration zone where the adsorbed perchlorate is effectively removed from the resin using relatively low volumes of concentrated brine solution as the regenerant. The waste from the ISEP unit is a concentrated brine solution containing perchlorate and other anions that may be present in the feed stream. This waste stream from the ISEP unit is treated by a combination of: i) bioreactor or a catalytic reactor that removes perchlorate and nitrate (if present) anions ii) sulfate removal (if needed) by nanofiltration or other established methods and iii) filters and a disinfectant system to render the brine stream re-usable. The resulting stream is recycled back into the process. The entire process results in a very small waste stream that needs disposal. The process can be applied to feed water streams containing either perchlorate alone or perchlorate and other anions such as nitrate, sulfate and bicarbonate.

    摘要翻译： 公开了一种浓缩和破坏地下水和饮用水源中存在的高氯酸盐和硝酸盐阴离子的方法。 在此过程中，进料水中存在的高氯酸盐和硝酸根阴离子浓缩成更小的排出物流。 典型的工艺配置包括使用称为ISEP的连续连续装置，其中进料水中存在的高氯酸盐被吸附到离子交换树脂上，导致不含高氯酸盐的处理水。 ISEP单元还包括再生区，其中使用相对低体积的浓缩盐水溶液作为再生剂，将吸附的高氯酸盐有效地从树脂中除去。 来自ISEP单元的废物是含有可能存在于进料流中的高氯酸盐和其它阴离子的浓缩盐水溶液。 来自ISEP单元的这种废物流由以下组合来处理：i）生物反应器或催化反应器，其去除高氯酸盐和硝酸盐（如果存在）阴离子ii）通过纳滤或其他已建立的方法硫酸盐去除（如果需要）和iii）过滤器和 用于使盐水流可重复使用的消毒系统。 所得到的流被循环回到该过程中。 整个过程导致需要处理的非常小的废物流。 该方法可以应用于含有单独的高氯酸盐或高氯酸盐和其它阴离子如硝酸盐，硫酸盐和碳酸氢盐的给水流。