Pretreatment device and method for treating high-concentration chemical wastewater

Abstract

The invention relates to a pretreatment device and method for treating high-concentration chemical wastewater. The pretreatment device comprises an adjusting tank, a first-stage coagulation reaction tank, a primary sedimentation tank, a sand filter, a first-stage ozone oxidation tank, an electro-catalysis reactor, a second-stage ozone oxidation tank, a second-stage coagulation reaction tank and a secondary sedimentation tank, wherein the adjusting tank, the first-stage coagulation reaction tank, the primary sedimentation tank, the sand filter, the first-stage ozone oxidation tank, the electro-catalysis reactor, the second-stage ozone oxidation tank, the second-stage coagulation reaction tank and the secondary sedimentation tank are connected with one another in sequence to form an integrated treatment device. The pretreatment device and method for treating high-concentration chemical wastewater, provided by the invention, combine the advantages of various coagulation, filtration, oxidation and electro-catalysis reduction, and the wastewater treated by the device can ensure that the chroma and CODcr of the wastewater can be effectively degraded and the B / C ratio and the biochemical property are improved, so that the device and the method have the advantages of being low in treatment cost, simple in operation and easy to control.

Description

technical field [0001] The invention relates to a wastewater pretreatment device and method, in particular to a high-salt, high-chroma, high-COD high-concentration chemical wastewater pretreatment device and treatment method, belonging to the technical field of chemical wastewater treatment. Background technique [0002] With the rapid development of the economy, the pollution of the environment in the production process of chemical products has intensified, and the hazards to human health have become increasingly common and serious. The composition of chemical wastewater is complex, the water volume changes greatly, the content of pollutants in the wastewater is high, and there are many toxic and harmful substances, such as halogen compounds, nitro compounds, dispersants or surfactants with bactericidal effects, etc., and the chromaticity and conductivity of the wastewater are high. There are many biodegradable substances, low B / C, and poor biodegradability. Therefore, che...

AI Technical Summary

Problems solved by technology

Therefore, the removal rate of physical and chemical means is low, and a large amount of clean water is required to be diluted to a low concentration (10 to 50 times) before biochemical, and some compounds are not biodegradable and have poor biochemical properties, and the biochemical effluent often does not meet the standard; at the same time, such a treatment method Make the wastewater treatment facility bulky, increase the cost, and increase the operating cost

At present, there is no pretreatment equipment and process specifically for the effective treatment of chemical wastewater.

Images