Method for degrading organic wastewater

Abstract

The invention provides a method for degrading organic wastewater, which is characterized by comprising the following steps: (1) carrying out electrooxidation pretreatment on industrial heavy metal organic wastewater to obtain a solution A; wherein the electrooxidation pretreatment is carried out by using a high-performance oxidizer, and a cathode plate and an anode plate used by the high-performance oxidizer are boron-doped diamond film composite electrode plates; (2) adjusting the pH value of the solution A obtained in the step (1), and feeding the solution A into a membrane concentration system for filtration and concentration to obtain a solution B; and (3) feeding the solution B obtained in the step (2) into a triple-effect evaporative crystallization system for evaporative concentration, cooling for crystallization, separating solids, and recovering crystalline salt to obtain degraded organic wastewater. The method can effectively realize degradation of organic wastewater COD andremoval of heavy metal ions, reduces the wastewater treatment cost, improves the purity and the recycling value of the heavy metal crystalline salt, and has a high salt removal rate and a high wastewater recovery rate. The method is simple and controllable in technical parameters and high in practicability.

Description

technical field [0001] The invention relates to the field of water purification, in particular to a method for degrading organic wastewater. Background technique [0002] With the rapid development of industry, the types and quantities of wastewater have increased rapidly, and the pollution of water bodies has become increasingly widespread and serious, threatening human health and safety. In the process of industrial production, a large amount of organic wastewater is produced. The organic wastewater produced by industrial production has complex components, some of which are toxic, and there are many acids and bases, often with strong acid or strong alkali. Industrial organic wastewater mainly has the following hazards: First, aerobic hazard: Due to biodegradation, high-concentration organic wastewater will make the receiving water body anoxic or even anaerobic, and most aquatic organisms will die, resulting in stench, deteriorating water quality and environment. The secon...

AI Technical Summary

Problems solved by technology

Industrial organic wastewater mainly has the following hazards: First, aerobic hazard: due to biodegradation, high-concentration organic wastewater will make the receiving water body anoxic or even anaerobic, and most aquatic organisms will die, resulting in stench, deteriorating water quality and environment

The second is sensory pollution: high-concentration organic wastewater not only makes the water lose its use value, but also seriously affects the normal life of people near the water

The third is toxicity hazards: ultra-high concentration organic wastewater contains a large amount of toxic organic substances, which will continue to accumulate and store in natural environments such as water bodies and soils, and finally enter the human body, endangering human health

Second, the composition is complex

Third, high chroma and peculiar smell

However, the disadvantages of this method in practical promotion and application are: ①The amount of wastewater is limited by the matching boiler; ②The components of the wastewater should be analyzed in detail to ensure that the combustion of the boiler body is not affected; ③This method has a relatively high efficiency in the treatment of high concentration organic wastewater. Applicability, but for the treatment of medium and low concentration organic wastewater, the energy consumption and cost of treatment are high

However, the current technology has high energy consumption and low oxidation efficiency

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