| 摘要 |
The object of the present invention is a method for underwater decomposition of organic content of aqueous waste solutions, involving the measurement and, if necessary, adjustment of the pH and electric conductivity of the solution, maintaining optimum pH and/or electric conductivity during the process, and further involving the partial or total decomposition of organic materials contained by the solution. A further object of the invention is an apparatus for underwater decomposition of organic content of electrically conductive aqueous waste solutions, comprising a feed tank, at least one decomposition loop, and a storage tank. The method according to the invention is characterised by submerging electrodes in the solution, producing and maintaining an electric arc between the electrodes and the electrically conductive the solution, where the arc is produced by an electric current of at least 0,5 A/cm<2 >current density at a voltage of at least 70 V and by a symmetrical alternating current having preferably a frequency of at least 10 Hz; and by decomposing the organic content of the solution into water, carbon dioxide, and nitrogen. The inventive apparatus is characterised by that it comprises a batch-mode decomposition loop (17) comprising a post-decomposing batch reactor (7), a buffer tank (5), and a circulation pump (10), with the feed tank (1) and a storage tank (8) being connected to said batch-mode decomposition loop (17) through a feed pump (4), and by that the batch-mode decomposition loop (17) is connected with a pretreating solution tank (2) through an adjusting unit (18) and a feed pump (4); with a splash condenser (13) connected to the batch reactor (7), where said splash condenser (13) condenses and at least partially recycles into said batch reactor (7) vapours produced therein, and with electrodes being submerged into the waste solution stored in said batch reactor (7), where said electrodes are connected to a current source (19) supplying electric current of at least 0,5 A/cm<2 >current density at a voltage of at least 70 V that is capable of producing and maintaining an electric arc between the electrodes and the waste solution, with said current source (19) producing symmetrical alternating current having preferably a frequency of at least 10 Hz.
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