Method for removing metals from waste water and apparatus for removing metals from waste water

Abstract

This invention provides a method for removing metals from waste water in which metals such as thallium contained in waste water produced upon water washing of chlorine-containing wastes, raw garbage burned ash, fly ash and the like are removed to a concentration not more than the value specified in waste water standards to improve the water quality of the waste water, and an apparatus for removing metals from waste water. The method for removing metals from waste water is characterized by comprising applying a direct current by an electrolyzer (5) to a reaction tank (1), a precipitation tank (2), and a metal aggregate-containing waste water (S5) discharged through the reaction tank (4) to perform electrolysis, precipitating metals, dissolved in the waste water (S5), as metal oxides upon the electrolysis of the waste water (S5), separating the waste water (S6), in which metal oxides have been precipitated, into a suspended solid (MP) and waste water (S7) by a microfiltration apparatus (6), and removing metals dissolved in very small amounts in the waste water (S7), from which the suspended solid (MP) has been removed, by ion exchange equipment (7).

Description

technical field [0001] The present invention relates to a method and a removal device for removing metals from drain water, in particular to a method for washing waste water containing chlorine, or washing kitchen waste incineration ash, fly ash, plastic incineration ash, etc. It is suitable for removing metals such as thallium, lead, cadmium, chromium, mercury, etc. contained in the wastewater generated during the process, and is suitable for the method and removal device for removing metals from the wastewater when purifying water quality. [0002] This application claims priority based on Patent Application No. 2005-317272 filed in Japan on October 31, 2005, and the content thereof is incorporated herein. Background technique [0003] In recent years, with the improvement of global environmental protection, environmental measures have been taken seriously in final treatment facilities of industrial waste, petrochemical plants, various factories, etc., including cement man...

AI Technical Summary

Problems solved by technology

For this reason, if there is no treatment such as pretreatment to reduce the concentration of heavy metals in the effluent, it may not be possible to effluent in this state.

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