Method and device for treating chemical wastewater with high salt content and high organic matter content

Abstract

The invention provides a method and a device for treating chemical wastewater with high salt content and high organic matter content, and belongs to the technical field of sewage treatment. The methodcomprises the following steps: 1) dividing production wastewater into high salinity wastewater, low salinity wastewater, alkaline wastewater, acidic wastewater and oily wastewater; (2) adding the acidic wastewater into the high-salinity wastewater and the oily wastewater subjected to air floatation treatment in an acid regulating tank to regulate the pH value to be less than 7, carrying out Fenton tower and a degassing reaction, adding the alkaline wastewater to regulate the pH value to be 7, adding PAM to perform a coagulation reaction and precipitation, and collecting sludge and an overflowliquid; 3) pumping the overflow liquid into an evaporator to remove salts; and 4) mixing the evaporated wastewater with the low salinity wastewater, carrying out biochemical treatment, namely anaerobic treatment, anoxic treatment, aerobic treatment and secondary sedimentation, and carrying out the coagulation reaction and sedimentation to obtain standard-reaching effluent. The method successfullysolves the problem of treatment of the chemical wastewater with high salt content and high organic matter content, does not generate biochemical sludge, and has the characteristics of low operating cost, and stability in operation.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method and device for standard-reaching treatment of salt-containing organic chemical wastewater. Background technique [0002] At present, there are about 30,000 chemical enterprises in my country, accounting for about 70% of the total number of industrial enterprises. Although the scales of chemical enterprises in my country vary, there are some obvious commonalities: such as strong dependence on resources, strong dependence on technology, special production process, large-scale production, etc. At the same time, it can be found that general chemical plants will produce Lots of waste water. As a large water user, chemical plants generally consume several million cubic meters of tap water annually, and the water reuse rate is low. At the same time, millions of cubic meters of sewage are discharged, which not only wastes a lot of water resources, but also c...

AI Technical Summary

Problems solved by technology

The method can simultaneously remove fluorine substances, salt inorganic substances and COD, can effectively solve the problem of high salt, high organic matter and fluorine in the saline organic chemical wastewater, and completely degrade the organic substances in the saline organic chemical wastewater , The total nitrogen is effectively removed, and the sludge production in the whole process is small, and the biochemical sludge can digest the sludge in the system, which effectively reduces the investment and operating costs of sludge treatment; it has the advantages of low operating cost and simple operation and management.

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