Combined treatment method for discarded sodium dichromate and emulsion

Abstract

The invention discloses a combined treatment method for discarded sodium dichromate and an emulsion. The oxidizing property of sodium dichromate and reductibility of an organic matter in the emulsionof a materializing workshop are used, and the emulsion and the sodium dichromate are mixed to cause a redox reaction of a mixed solution, the high-valent chromium ion in sodium dichromate is reduced to a low-toxicity low-valent chromium ion, and the organic matter in the emulsion is removed; the mixed liquid after the reaction is dehydrated by direct pressure filtration, and a separated solid matter is solidified, and the filtered water is introduced to a sewage station after reaching the standard for uniform treatment. In this way, by treating waste, the hexavalent chromium in sodium dichromate is reduced to trivalent chromium which is less toxic, and the organic matter in the emulsion is removed, and by sedimentation and pressure filtration, the treated wastewater reaches the standard and is introduced into a sewage treatment system, after the final disposal is qualified, the product is reused, and the filtered sludge enters a solidification workshop for landfill treatment.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, in particular to a combined treatment method of waste sodium dichromate and emulsion. Background technique [0002] Sodium dichromate is a waste of hexavalent chromium. Hexavalent chromium is extremely toxic and is easily absorbed by the human body. It can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, which may cause skin allergies, vomiting, abdominal pain, and long-term exposure Or there is a risk of carcinogenesis when inhaled, and it is more likely to cause hereditary gene defects and cause persistent harm to the environment. [0003] The traditional disposal method of sodium dichromate is to dissolve, reduce, and precipitate in a reaction tank first, then solidify, and finally landfill safely. It has low disposal efficiency, high disposal cost, a lot of sludge, and a large safety risk for centralized disposal. and other sh...

AI Technical Summary

Problems solved by technology

[0002] Sodium dichromate is a waste of hexavalent chromium. Hexavalent chromium is extremely toxic and is easily absorbed by the human body. It can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, and may cause skin allergies, vomiting, abdominal pain, and long-term exposure Or there is a risk of carcinogenesis when inhaled, and it is more likely to cause hereditary gene defects, and it is a persistent hazard to the environment

[0003] The traditional disposal method of sodium dichromate is to dissolve, reduce, and precipitate in a reaction tank first, then solidify, and finally landfill safely. It has low disposal efficiency, high disposal cost, a lot of sludge, and a large safety risk for centralized disposal. and other shortcomings

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