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SYSTEM FOR TREATING SELENIUM-CONTAINING WASTEWATER, METHOD FOR TREATING SELENIUM-CONTAINING WASTEWATER, AND METHOD FOR RECOVERING SELENIUM FROM SELENIUM-CONTAINING WASTEWATER
SYSTEM FOR TREATING SELENIUM-CONTAINING WASTEWATER, METHOD FOR TREATING SELENIUM-CONTAINING WASTEWATER, AND METHOD FOR RECOVERING SELENIUM FROM SELENIUM-CONTAINING WASTEWATER
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机译：用于处理含硒废水的系统，一种用于处理含硒废水的方法以及一种从含硒废水中回收硒的方法
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摘要
A system for treating a selenium-containing wastewater is provided in which, in the case where the wastewater has a high selenium concentration and a high concentration of substances that inhibit selenium removal, a cost reduction can be made by effectively utilizing an iron-containing substance for selenium removal and by further recovering the selenium.The system for treating a selenium-containing wastewater is equipped with a sulfuric acid removal step (1) in which sulfuric acid ions (SO42-) are mainly removed from the wastewater and with a COD matter removal step (2) in which dithionic acid ions (S2O62-) are mainly removed from the wastewater. The system is further equipped with a selenium removal step (3) in which selenium is removed from the wastewater. In the removal of selenium in the selenium removal step (3), hexavalent selenium is reduced by iron to produce tetravalent selenium. The thus-oxidized iron becomes iron hydroxide to sediment as sludge, during which the tetravalent selenium coprecipitates with the iron sludge. Some of the resultant sludge is circulated to the COD matter removal step (2) and introduced into the selenium-containing wastewater. Thus, effective utilization of iron and selenium recovery can be achieved.
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机译：提供一种用于处理含硒废水的系统，其中，在废水中硒浓度高且抑制硒去除的物质的浓度高的情况下，可以通过有效地利用含铁物质来降低成本。用于去除硒和进一步回收硒。用于处理含硒废水的系统配备有硫酸去除步骤（1），其中主要从废水中去除硫酸根离子（SO 4 2-）。废水和COD物质去除步骤（2），主要从废水中去除二亚硫酸离子（S 2 O 6 2-）废水。该系统还配备了硒去除步骤（3），其中从废水中去除了硒。在硒去除步骤（3）中的硒去除中，六价硒被铁还原以产生四价硒。如此氧化的铁变成氢氧化铁，以淤渣形式沉淀，在此期间四价硒与铁淤渣共沉淀。将一些生成的污泥循环到COD物质去除步骤（2），并引入含硒废水中。因此，可以实现铁和硒回收的有效利用。
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