High-salinity industrial wastewater treatment method based on biochemical treatment

Abstract

The invention discloses a high-salinity industrial wastewater treatment method based on biochemical treatment, which comprises the following steps: introducing high-salinity industrial wastewater into an immersed ultrafiltration system to filter colloid and particulate matters in wastewater; introducing into an electrodialysis system to primarily desalt the wastewater, regulating PH to 6.2-6.5 by using fresh water, and then introducing into a reverse osmosis system to secondarily desalt, and introducing into a bio-contact oxidation system to desalt the wastewater for the third time to remove COD (chemical oxygen demand) in the wastewater; and introducing the wastewater subjected to bio-contact oxidation treatment in a secondary sedimentation tank to precipitate. The high-salinity industrial wastewater is treated by combining a physical-chemical process and a biochemistry process after the immersed ultrafiltration, electrodialysis, reverse osmosis treatment and the bio-contact oxidization treatment; after three-level desalting treatment, the salt in the wastewater is effectively removed; the purifying efficiency is high, and the purifying effect is good; after the wastewater with the COD of 2370mg / L and the salt content of 1.2-1.7% is treated by the method disclosed by the invention, the effluent BOD5 (biochemical oxygen demand 5) is less than 30mg / L, the COD is less than 100mg / L, and the COD removal rate achieves 96%.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating high-salinity industrial wastewater based on biochemical treatment. Background technique [0002] High salinity organic wastewater refers to wastewater containing organic matter and at least 3.5% (mass fraction) total dissolved solids (TDS). There are two main sources of this type of wastewater: 1) Seawater is directly used for industrial production and wastewater discharged after domestic use. For example, in industry, seawater can be widely used as boiler cooling water; in urban life, seawater can replace fresh water as toilet flushing water , the salt content of such wastewater is generally 2.50×10 4 ~3.50×10 4 mg / L (mass concentration); 2) Wastewater discharged from the production process of some industrial industries, such as saponin wastewater, petroleum development wastewater, and wastewater discharged from printing and dyeing, papermaking, pharm...

AI Technical Summary

Problems solved by technology

[0003] The traditional high-salinity industrial wastewater treatment method adopts physical and chemical treatment, which requires large investment and high operating costs, and it is difficult to achieve the expected purification effect

In addition, the existing treatment process usually adopts a single treatment method for wastewater purification, which has low treatment efficiency and unsatisfactory purification effect, and cannot completely solve the problem of wastewater pollution.

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