Method for treating high-cod surplus water

Abstract

This invention relates to the field of organic wastewater treatment technology, specifically to a method for treating high-COD excess water: (1) First, a mixture I containing high-COD excess water and electrolyte I is subjected to electrocatalytic oxidation treatment I to obtain purified liquid I and tail gas I. Then, purified liquid I is mixed with active components to obtain an impregnation solution. Then, the carrier is impregnated in the impregnation solution and calcined to obtain a molybdenum-based residue oil hydrodemetallization catalyst; or, a mixture II containing high-COD excess water and electrolyte II is subjected to electrocatalytic oxidation treatment II to obtain purified liquid II and tail gas II. Then, purified liquid II is filtered and subjected to biochemical treatment to obtain biochemical effluent; electrolyte I is nitric acid, and electrolyte II is selected from one or more of sodium sulfate, sodium chloride, potassium chloride, and potassium sulfate; (2) Tail gas I and / or tail gas II are contacted with alkaline solution for tail gas absorption treatment. This method has mild operating conditions, good treatment effect, and high economic benefits, and is suitable for promotion.

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