Zero discharge treatment system and method for industrial wastewater with high chemical oxygen demand (COD)

Abstract

The invention discloses a zero discharge treatment system and method for industrial wastewater with a high chemical oxygen demand (COD). The system comprises a reclaimed water regulating reservoir, a biological aerated filter, a lime clarifier, a variable pore filter, an ultra-filtration device, a multi-stage reverse osmosis device, a concentrated water reverse osmosis device, a concentration section desalter, a multi-effect evaporation system and a solid recovery device, which are orderly connected through a pipeline, wherein the biological aerated filter, the variable pore filter and the ultra-filtration device are provided with backwash devices; the backwash devices are connected with the reclaimed water regulating reservoir. By adopting the zero discharge treatment system and method, chemical cleaning times of the ultra-filtration and reverse osmosis devices can be reduced, the service life of membrane elements is ensured, the cost caused by replacing a component is reduced, and zero discharge of the industrial wastewater with high COD is achieved.

Description

technical field [0001] The invention relates to a zero-discharge treatment system and method for high COD industrial wastewater, belonging to the technical field of wastewater treatment. Background technique [0002] COD (Chemical Oxygen demand), also known as chemical oxygen demand, refers to the amount of oxygen consumed when treating water samples with strong oxidants under certain conditions. It reflects the degree of pollution of reducing substances in water, and reducing substances in water are mainly Including organic matter, nitrite, ferrous salt, sulfide and other substances that can be oxidized. A higher COD indicates more organic pollutants in the water. Water with high COD content is discharged into the natural water body, causing algae to grow in large quantities, which will consume a large amount of dissolved oxygen in the water, causing the death of fish and other aquatic organisms in the water body due to hypoxia, destroying the ecosystem of the water body, ...

AI Technical Summary

Problems solved by technology

Water with high COD content is discharged into the natural water body, causing algae to grow in large quantities, which will consume a large amount of dissolved oxygen in the water, causing the death of fish and other aquatic organisms in the water body due to hypoxia, destroying the ecosystem of the water body, and further causing the anaerobic development of the water body. Odor, thus making the water useless

[0003] At present, the existing industrial wastewater treatment technology cannot cope with high COD load, resulting in frequent chemical cleaning of ultrafiltration and reverse osmosis systems, shortening the service life of membrane elements

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