Water-based ink wastewater treatment process

Abstract

The invention discloses a water-based ink wastewater treatment technique which comprises steps as follows: water-based ink wastewater is subjected to water quality homogenization through a regulating tank; a coagulant and a flocculant are sequentially added for pretreatment; the pretreated wastewater is driven into a filter press, and the filter press intercepts large-particle-size suspended substances in the wastewater; the press filtrate enters a filtrate tank; the wastewater in the filtrate tank enters a reaction tank; a coagulant and a flocculant are sequentially added to the wastewater in the reaction tank; the wastewater is driven into a floatation tank; small bubbles generated by a dissolved gas releaser in the floatation tank are utilized to bind the large-particle-size suspended particles, thereby forming a floating body with smaller overall density than water; the floating body floats upward to the water surface under the action of buoyancy, and is scraped down by a residue scraper arranged on the water surface; and the wastewater enters a two-stage A / O biochemical treatment system, and is precipitated in a precipitation tank and then discharged. The discharge water can achieve Grade 1 in National Integrated Wastewater Discharge Standard, and solves the problems of high cost and difficulty in discharge after reaching the standard in the water-based ink wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment of environmental engineering, and in particular relates to a treatment process of water-based ink waste water. Background technique [0002] At present, the domestic carton packaging industry generally uses water-based ink printing technology. During the production process, it is necessary to replace the ink and clean the printing equipment, so a certain amount of ink wastewater will be generated. Since the COD and chroma of water-based ink wastewater are generally very high, and the biodegradability is poor, the method of directly adding water to dilute the chroma and COD of the wastewater is difficult to reach the standard even if it is diluted dozens of times or even hundreds of times or thousands of times. At the same time, it increases the amount of wastewater discharged, the difficulty of treatment and the cost of treatment; the method of incineration and foreign transportation...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above defects, the present invention provides a water-based ink wastewater treatment process. The water-based ink wastewater treatment process uses the combined process of "coagulation filtration + air flotation + biological oxidation" to treat water-based ink wastewater, which can meet the national sewage comprehensive discharge standard (GB8978-1996) first-level discharge standard, which solves the problem of high cost of water-based ink wastewater treatment and difficulty in reaching the standard discharge

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