Chemical wastewater recovery processing technique and apparatus

Abstract

The invention belongs to the technical field of sewage treatment, in particular to a recycling and treatment technique of chemical industry waste water and a device. The technical proposal is as follows: the recycling and treatment technique of chemical industry waste water comprises the following steps of: using lime water to adjust the pH value of the chemical industry waste water; primary settlement; hydrolysis and acidification; adjusting the pH value to 7 to 7.5; carrying out aerobic biochemical treatment in an active sludge tank; secondary settlement; air floatation; and storage. The invention also provides a device for recycling and treatment of the chemical industry waste water, comprising a grating, an adjusting tank, a primary settling tank, a hydrolysis and acidification tank, an active sludge tank, a secondary settling tank, an air floating machine and a cleaning and storage tank, wherein, the adjusting tank, the primary settling tank, the hydrolysis and acidification tank, the active sludge tank, the secondary settling tank, the air floating machine and the cleaning and storage tank are connected in sequence. The technique has simple process, few structure, compact arrangement, little occupy area and saving investment; the water which is treated by the process of the technique reaches to the national primary standard of composite discharge of the sewage, and can completely recycle and utilize without secondary pollution, thus realizing cleaner production and civilizer production.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a process and a device for recycling and treating chemical wastewater. Background technique [0002] Chemical enterprises produce a large amount of chemical wastewater, which contains high suspended solids (SS), the SS content is generally around 200gm / l, the chemical oxygen demand (CODcr) can reach 2600mg / l, and the pH value is about 5.5. It is acidic, and the wastewater contains refractory organic substances with even fluorine, carbon double bonds, nitro, and halogenated structures. The traditional biological oxidation method cannot completely solve the problem of organic pollution, and the treatment cost is very high. The treated water If it fails to meet the national first-level discharge standard, it will cause certain pollution to the environment, cannot be recycled and reused, and a large amount of water resources will be wasted. Contents of the inve...

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Problems solved by technology

[0002] Chemical enterprises produce a large amount of chemical wastewater, which contains high suspended solids (SS), the SS content is generally around 200gm / l, the chemical oxygen demand (CODcr) can reach 2600mg / l, and the pH value is about 5.5. It is acidic, and the wastewater contains refractory organic substances with even fluorine, carbon double bonds, nitro, and halogenated structures. The traditional biological oxidation method cannot completely solve the problem of organic pollution, and the treatment cost is very high. The treated water If it fails to meet the national first-level discharge standard, it will cause certain pollution to the environment, cannot be recycled and reused, and wastes a lot of water resources

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