Treatment method for high-concentration organic wastewater and device used thereby

Abstract

The invention provides a treatment method for high-concentration organic wastewater and a device used thereby. The method comprises the following steps of: providing high-concentration organic wastewater; aerating the wastewater in an aeration section of a biological reaction unit to obtain mixed solution of dissolved oxygen, an organic substance, an inorganic substance, active sludge and water, wherein the specific gravity of the mixed solution is between 1.01 and 1.05; allowing a mixture of the dissolved oxygen and the organic substance to pass through an anaerobic section, an oxygen-poor section and an aerobic section, so that the organic substance is decomposed; allowing the active sludge and the water to enter a reflux unit to separate the sludge from water, allowing the preset amount of separated sludge to enter a stripping unit, and collecting excess sludge and the obtained purified water and discharging; mixing the sludge in the stripping unit and the water, and performing reflux to return the biological reaction unit, and cycling repeatedly to perform the reaction steps to obtain the purified water which meets the requirement, wherein the reflux cycle ratio in the cycle is high ratio of between 5 and 500, and the reflux cycle ratio is the ratio of internal cycle water yield to water inflow yield.

Description

technical field [0001] The invention relates to a method for treating organic waste water and a device used in the method, in particular to a method for treating high-concentration organic waste water and a device used in the method. Background technique [0002] At present, the treatment of organic wastewater has become a practical problem that needs to be solved more and more urgently. However, the current conventional treatment methods are usually aimed at low-concentration organic wastewater. [0003] For example, a short-cut nitrification and denitrification technology is controlled by specific means in the A / O process (anoxic-aerobic bioreactor), by setting a DO sensor and a pH sensor in the aerobic tank, and an ORP sensor in the anoxic tank , the internal circulation controller dynamically controls the internal circulation return flow of the system, and the aerator controller dynamically controls the aeration volume of the system; the aeration volume controls the low...

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Problems solved by technology

Usually, the anaerobic treatment effect is better, and the operating cost is not high, but it is generally used as the pretreatment stage of the aerobic method, which cannot meet the emission standard, and must be supplemented by aerobic biochemical treatment.

For the aerobic method, there are still problems to be solved in various cost-effective industrial methods, such as: (1) when the high-concentration organic wastewater contains organic amines, the problem encountered by the traditional activated sludge method is : Generally, nitrifying bacteria with shorter mud age and longer generation period (about 20 days) are washed out in the system, and it is difficult to form high-concentration nitrifying bacteria. High-concentration organic matter makes heterotrophic bacteria have an absolute advantage in growth competition (2) In other traditional activated sludge processes, after the mixed solution enters the anoxic environment of the secondary settling tank, (the product that has been nitrified) immediately enters the denitrification stage, especially under high temperature conditions, causing the sludge to float up and be difficult to settle

[0009] In addition, the sewage treatment process adopted abroad also incorporates relatively new ideas such as dilution at the inlet (outlet) water end, combination of biological and photochemical methods, such as fenton method (a kind of advanced oxidation method, Fenton reagent method), ozone Oxidation method, photooxidation method, etc.; these methods provide new ideas, but these methods are expensive and complicated, and are not suitable for China's national conditions

[0010] In practice, there are still no engineering examples with good treatment effects and low operating costs for the treatment of high-concentration organic wastewater that are suitable for China's national conditions

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