PROCESS FOR DECONTAMINATING PRESERVATIVE-TREATED WOOD AND RECOVERING METALS FROM LEACHATES
    1.
    发明申请
    PROCESS FOR DECONTAMINATING PRESERVATIVE-TREATED WOOD AND RECOVERING METALS FROM LEACHATES 审中-公开
    去除防腐处理木材和从浸出中回收金属的工艺

    公开(公告)号:US20110108063A1

    公开(公告)日:2011-05-12

    申请号:US12736455

    申请日:2009-04-08

    IPC分类号: B08B7/04

    CPC分类号: B27K3/16 B27K2240/15

    摘要: Described is a process for decontaminating wood treated with preservative such as chromium copper arsenate (CCA) including contacting the contaminated wood with water and inorganic acid at a concentration between 0.05 and 0.8 N at less than 100° C. to leach out the contaminants and then separate the wood from the solution. Also described is a process for extracting metals such as copper from a solution containing chromium, copper and arsenic, such as the leachate solution used to decontaminate CCA-treated wood, by precipitation using a coagulant at a pH favoring precipitation of arsenic and continued solubility of copper, or by ion exchange resins.

    摘要翻译: 描述了用防腐剂如砷酸铜铜(CCA)处理的木材进行净化处理的方法,包括在低于100℃下将污染的木材与水和无机酸的浓度为0.05-0.8N接触以浸出污染物,然后 将木材与溶液分开。 还描述了从含有铬,铜和砷的溶液中提取金属的方法,例如用于净化CCA处理过的木材的渗滤液,通过在有利于砷沉淀的pH下使用凝结剂进行沉淀,并持续溶解度 铜或通过离子交换树脂。

    Method for stabilizing and conditioning urban and industrial wastewater sludge
    3.
    发明申请
    Method for stabilizing and conditioning urban and industrial wastewater sludge 有权
    城市和工业废水污泥的稳定和调理方法

    公开(公告)号:US20050077245A1

    公开(公告)日:2005-04-14

    申请号:US10497059

    申请日:2002-11-29

    摘要: The invention concerns a method for stabilizing and conditioning wastewater sludge. The invention is characterized in that it consists in treating sludge in an acid environment (3.0≦pH≦5.0), with an inorganic acid and two oxidizing agents, that is a ferric iron salt and hydrogen peroxide. The ferric iron salt is used in such an amount as to obtain a concentration ranging between 5 and 40 kg of Fe per iron of dry sludge; the hydrogen peroxide is used in such an amount as to obtain a concentration ranging between 5 and 40 kg of H2O2 per ton of dry sludge; mixing the treated sludge for a time interval sufficient to stabilize the sludge and improve its dehydrability; then flocculating the stabilized sludge by adding an organic polymer; then dehydrating the flocculated sludge. Said method enables to significantly improve the dehydrability properties of the sludge while increasing the dry solid content during its mechanical dehydration.

    摘要翻译: 本发明涉及一种稳定和调理废水污泥的方法。 本发明的特征在于它包括用酸性环境(3.0 <= pH <= 5.0)处理污泥中的无机酸和两种氧化剂,即三价铁盐和过氧化氢。 使用三价铁盐,其用量可获得每铁铁干渣5〜40kg的铁浓度; 过氧化氢的使用量要达到每吨干污泥5至40公斤H2O2的浓度; 将经处理的污泥混合足够的时间间隔以稳定污泥并提高其脱水性; 然后通过加入有机聚合物絮凝稳定的污泥; 然后使絮凝的污泥脱水。 所述方法能够显着改善污泥的脱水性能,同时在机械脱水过程中增加干固体含量。

    Method for stabilizing and conditioning urban and industrial wastewater sludge
    5.
    发明授权
    Method for stabilizing and conditioning urban and industrial wastewater sludge 有权
    城市和工业废水污泥的稳定和调理方法

    公开(公告)号:US07497956B2

    公开(公告)日:2009-03-03

    申请号:US10497059

    申请日:2002-11-29

    IPC分类号: C02F11/14

    摘要: The invention concerns a method for stabilizing and conditioning wastewater sludge. The invention is characterized in that it consists in treating sludge in an acid environment (3.0≦pH≦5.0), with an inorganic acid and two oxidizing agents, that is a ferric iron salt and hydrogen peroxide. The ferric iron salt is used in such an amount as to obtain a concentration ranging between 5 and 40 kg of Fe per ton of dry sludge; the hydrogen peroxide is used in such an amount as to obtain a concentration ranging between 5 and 40 kg of H2O2 per ton of dry sludge; mixing the treated sludge for a time interval sufficient to stabilize the sludge and improve its dehydrability; then flocculating the stabilized sludge by adding an organic polymer; then dehydrating the flocculated sludge. Said method enables to significantly improve the dehydrability properties of the sludge while increasing the dry solid content during its mechanical dehydration.

    摘要翻译: 本发明涉及一种稳定和调理废水污泥的方法。 本发明的特征在于它包括用酸性环境(3.0 <= pH <= 5.0)处理污泥中的无机酸和两种氧化剂,即三价铁盐和过氧化氢。 三氯铁酸盐的使用量要达到每吨干污泥5至40公斤Fe之间的浓度; 过氧化氢的使用量要达到每吨干污泥5至40公斤H2O2的浓度; 将经处理的污泥混合足够的时间间隔以稳定污泥并提高其脱水性; 然后通过加入有机聚合物絮凝稳定的污泥; 然后使絮凝的污泥脱水。 所述方法能够显着改善污泥的脱水性能,同时在机械脱水过程中增加干固体含量。