Method used for chrome tanning waste water treatment and chrome recovery

Abstract

The invention discloses a method used for chrome tanning waste water treatment and chrome recovery. The method comprises the steps of pretreatment, pH adjustment, electric flocculation treatment, aeration sedimentation treatment, sludge reaction pool treatment, electro-catalysis oxidization treatment and the like. A novel method for treating chrome-contained waste water through an electrochemical method is provided for the field of leather water treatment, a technology for recovering chrome in sludge is studied and developed, chrome resource consumption is lowered, the purposes of up-to-standard discharging of the chrome-contained waste water and recycling and reusing of chrome resources are realized, and meanwhile, the problem of after-treatment of a large amount of chrome sludge in waste water treatment is solved.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating chrome tanning wastewater and recovering chromium, which is suitable for the treatment of chrome tanning wastewater and the recovery and reuse of chromium in tanning enterprises. Background technique [0002] Chrome tanning is widely used in the leather industry, but the utilization rate of chromium is very low, and 30%-40% of chromium is not absorbed and fixed by leather in the end, but is discarded as pollutants. Heavy metal chromium is the main pollutant in the wastewater and sludge discharged by such industries. The random discharge of chrome tanning wastewater will cause chromium salts to accumulate in soil, plants, and aquatic organisms, causing huge pollution to the environment. If chromium passes through Food chain into the human body, will greatly endanger human health. At the same time, the direct discharge of chromium will also cause th...

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Problems solved by technology

Various methods have certain advantages, but also have their disadvantages. If a large amount of chemical agents need to be added, the cost is expensive, the separation of chromium sludge is difficult, and it is easy to cause secondary pollution; especially the large amount of chromium sludge produced by the precipitation method. Not only does it contain chromium, but it also contains organic matter such as oil and protein. The composition is relatively complex, and it is a hazardous waste. It is difficult to dispose of it. It cannot be disposed of directly in landfill, and the subsequent cost is high.

And if the sludge is reused, impurities such as oil and protein will affect the quality of the finished leather, which is not conducive to the development of the enterprise

Therefore, the above method has not been widely applied.