Device and method for treatment of high-concentration thiocyanate wastewater

Abstract

The invention discloses a device and a method for treatment of high-concentration thiocyanate wastewater. The method includes the steps of: using thiocyanate high-effective degrading bacteria and using SCN<-> as a required nutrient in growth for microbially metabolizing the thiocyanides into SO4<2->, CO2 and N2. According to the technical scheme, the thiocyanides in wastewater is high-effectivelydegraded; the degradation process is completed with a large number of microorganisms, including bacteria, actinomycetes and fungi, which degrade the cyanides and thiocyanates into ammonia, CO2 and sulfates, and all the cyanides and thiocyanates can be removed by means of combination of oxidization and adsorption with a large number of microorganisms. The microbial treatment on the thiocyanate wastewater is carried out in a special bio-oxidizing pool, wherein proper growth conditions need to be created for the microorganisms artificially in order to culture the thiocyanate high-effective degrading bacteria. The microorganisms are fully utilized to decompose the thiocyanates, thereby high-effectively purifying the wastewater. After treatment, discharged water is less than 100 mg / L in COD, less than 8 mg / L in ammonia nitrogen and less than 0.5 mg / L in CN.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a treatment method for biological treatment of high-concentration thiocyanate-containing wastewater. It can be used in industrial wastewater treatment and other fields. Background technique [0002] Thiocyanate ion (SCN - ) is a negatively charged, polyatomic, linear ion, which exists in two structures -S-C≡N and -N=C=S, and has good complexation. As an important chemical raw material, thiocyanide is widely used in textile printing and dyeing, fine chemical industry, pharmaceutical industry and other fields. In the process of preparing industrial products, its dosing ratio is often excessive and cannot be completely reacted, resulting in a large amount of thiocyanate entering the wastewater system. With SCN - The direct discharge of waste water into the environment not only causes a large amount of chemical raw materials to be lost, but also affects the ecol...

AI Technical Summary

Problems solved by technology

Take the ozone oxidation method as an example to remove 1g of SCN - It needs to consume about 5 grams of ozone, and the treatment cost is high

It can be seen that most chemical degradation methods consume a lot of chemicals for the treatment of desulfurization waste liquid containing high concentration of SCN-. Although chemical methods are effective and feasible, they are expensive and easy to cause secondary pollution problems. Exceeding the standard of ions

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