Chemical industry park's wastewater bio-treatment apparatus and method thereof

Abstract

The invention relates to a chemical industry park's wastewater bio-treatment apparatus and a method thereof. The apparatus contains an equalizing tank, a primary settling tank, an improved ABR apparatus, a first-stage anoxic pool, a first-stage powdered active carbon aeration tank, a secondary-stage anoxic pool, a secondary-stage aeration tank, a secondary sedimentation tank, an ozone oxidation pool, a coagulation pool, a rotary disk filter, a chlorine dioxide disinfection pool and a sludge thickener. An UASB reactor is adopted in a first-grid reaction zone of the improved ABR apparatus so as to increase the first-grid sludge concentration and raise shock load resistance of an anaerobic reactor and biodegradability of wastewater. According to the two-stage A / O treatment technology, powdered active carbon is added into the first-stage aeration tank to enrich microorganisms and simultaneously absorb part of poisonous and harmful substances, thus mitigating or eliminating the inhibition effect of the poisonous and harmful substances on microorganisms in subsequent units; and the second-stage A / O system operates to further remove nitrogen and organic matters. An effluent in the secondary sedimentation tank undergoes depth treatments such as ozone oxidation, coagulation-filtration, disinfection and the like so as to further remove organic matters and suspended matters. The effluent is reused according to requirements.

Description

technical field [0001] The invention relates to a biological treatment device and method for wastewater in chemical industrial parks, which belongs to the field of wastewater treatment and is mainly used for the treatment of wastewater in chemical industrial parks and industrial parks. Background technique [0002] At present, the biological treatment method is still the main method of sewage treatment, using the catabolism and anabolic functions of microorganisms to decompose and transform the pollutants in sewage. Microbes can use most of the organic matter and part of the inorganic matter N and P in the sewage as a nutrient source to synthesize microbial cells. On the other hand, catabolism changes the existing form of pollutants. For example, organic matter is oxidized into CO 2 The form of gas overflow is removed, ammonia nitrogen is converted to N by 2 etc. The overflowed form is removed. [0003] The chemical industry is the pillar industry of my country's national ...

AI Technical Summary

Problems solved by technology

Mixed wastewater in chemical industry parks is usually mixed with chemical wastewater of various properties. The use of chemical methods alone to treat wastewater in chemical industry parks usually has problems with high investment, construction and operating costs due to the need to add a large amount of chemicals. Biological treatment methods have low operating costs, especially for Large-scale centralized sewage treatment plants, but it is difficult to achieve a good treatment effect because the wastewater contains toxic substances that inhibit the growth of microorganisms

[0004] Therefore, several problems that need to be solved when using biological treatment methods to treat wastewater in chemical industry parks are: organic load impact caused by fluctuations in wastewater quality, poor biodegradability caused by too low B / C of wastewater, growth inhibition of microorganisms by toxic and harmful substances, etc.

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