Processing method for waste water

Abstract

The invention provides a processing method for waste water, including in the electrolytic bath, feeding pure water into the cathode room, feeding the waste water into the anode room for the electrolysis, and thereby oxidizing the reduced nitrogen compound in the waste water to nitrogen gas by oxygen generated from the water contained in the waste water; or feeding pure water into the anode room, feeding waste water into the cathode room for the electrolysis, and thereby reducing nitrogen oxide to nitrogen gas by the hydrogen generated from the water contained in the waste water; wherein a diaphragm made from alumina is provided between the anode and the cathode, at least one of the anode and the cathode is formed into a reticular structure or porous structure, moreover, the anode and the cathode are disposed in close proximity interposing the membrane therebetween. The processing method of waste water is capable of, under normal temperature and pressure, without generating the secondary waste, removing nitrogen compounds such as hydrazine, an ammonium ion, a nitrate ion, a nitrite ion, or the like as a nitrogen gas from the waste water.

Description

[0001] This application is a divisional application of Chinese Patent Application No.98123361.9 with the filing date of December 10, 1998 and the title of the invention being "Waste Liquid Treatment Method and Treatment Device". technical field [0002] The invention relates to a waste liquid treatment method and a treatment device thereof. In more detail, it is about the electrochemical oxidation or reduction reaction of nitrogen compounds, in the form of nitrogen, from nitrogen reducing substances (nitrogen hydrogen compounds) containing hydrazine and ammonium, nitrogen oxides such as nitrate ions and nitrite ions A method for removing nitrogen compounds such as nitrogen compounds from waste liquids. In addition, nitrogen compounds, nitrogen reducing substances, and nitrogen oxides in this specification include ionic states, respectively. Background technique [0003] Generally, in the deoxidation (oxidation prevention) and anticorrosion treatment of the water supply syst...

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Problems solved by technology

[0010] However, these methods have problems in that, as shown below, reaction control is difficult, or, by sub-addition of an oxidizing agent and a catalyst, new secondary wastes and by-products are generated

[0011] That is, 1) In the method of oxidation treatment using an oxidizing agent, there is a problem that not only the handling of the oxidizing agent is difficult, but also by-products are produced due to excessive reaction

2) In the oxidation method using a catalyst, there is a problem that not only the catalyst itself forms harmful secondary waste to cause harm, but also the reaction is difficult to control

3) In the method of utilizing reverse osmosis membrane pressure filtration, the existing problem is that the treatment capacity is very small, and the concentrated waste liquid needs to be reprocessed. 4) In the electrodialysis method, the existing problem is that in addition to charged ions , the others not only cannot be processed, but also need to be reprocessed for the concentrated ionic components

[0012] Therefore, the current situation is that 5) although the method of oxidative decomposition using microorganisms is the most effective, the problem with this method is that the equipment is bulky, requires highly skilled technology to cultivate microorganisms, and requires a large amount of organic beverages, and the conditions of the water tank are difficult to control , once the decomposition reaction is disordered, it takes a long time to recover

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