Organic wastewater treatment method

Abstract

The present invention discloses an organic wastewater treatment method, which comprises: pouring organic wastewater into a stirring kettle having stirring; at a room temperature, adding a bleaching liquid containing calcium hypochlorite to carry out an advanced oxidation reaction, wherein the effective chlorine content in the bleaching liquid is 5-10%; determining the oxidation-reduction potential of the solution in the stirring kettle until the oxidation-reduction potential rises to a certain value, then suddenly descends and finally is not changed; and filtering the solution, and adding the filtrate to a biochemical pool to continuously carry out biological oxidation. The method of the present invention is the effective treatment method for treating the high concentration organic wastewater, wherein the calcium hypochlorite is adopted as the oxidant so as to generate the calcium salt, and the calcium salt precipitate can be directly removed through the filtration, such that advantages of convenience, efficiency and substantial reduction of the high concentration organic wastewater treatment cost are provided, and the oxidized filtrate can be directly subjected to the biological treatment.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for treating high-concentration organic wastewater. Background technique [0002] Synthetic chemical, papermaking, pesticide, pharmaceutical and other industries often produce some ultra-high pollutants, high-quality concentration, and high-viscosity organic wastewater in the production process. The characteristics of this type of wastewater: the concentration of pollutants is extremely high (for example, COD reaches 5×10 4 ~20×10 4 mg / l), the composition is complex, and the physical properties of each pollutant are very different, toxic and harmful, and the biodegradability is extremely poor (the main characteristics of organic wastewater), and the mass concentration is high and the viscosity is high (mass concentration 10-20%, Similar to edible oil or paint, which has a certain viscosity and poor fluidity), this "three highs" make it difficult to deal w...

AI Technical Summary

Problems solved by technology

Incineration treatment is usually only suitable for wastewater with high calorific value and extremely high mass concentration, but most of the high-concentration and high-viscosity wastewater does not necessarily have a high calorific value and high water content, so incineration treatment consumes more fuel and costs more. High, economically poor; In addition, incineration treatment will carbonize organic matter, which cannot be recycled as a resource, and burning organic waste water will also produce secondary pollution of dioxins

[0009] Oxidation of hydrogen peroxide, hydrogen peroxide has strong oxidizing properties under the catalysis of ferrous sulfate, but the oxidation performance of hydrogen peroxide is poor when the concentration of hydrogen peroxide is lower than 50%, and when the concentration of hydrogen peroxide is greater than 50%, there will be a risk of explosion when the content of organic matter is high

[0010] To sum up, the cost of the existing treatment technology is high, and the content of chloride ions after treatment is high, so that the treated organic wastewater cannot enter the biochemical pool to continue to digest the role of COD

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