A circulation treatment system for low-concentration cyanide-containing wastewater

Abstract

The invention discloses a cycling treatment system for low-concentration cyanide-containing wastewater. The cycling treatment system comprises pumping equipment, a mixer, an ozonator and a reactor, wherein the pumping equipment is used for pumping waste liquor, activated carbon regenerated acid liquor and a back washing liquor and connected with the mixer by a pipeline; the mixer comprises a static mixer and a Venturi mixer which are connected in series; the input end of the static mixer is connected with the pumping equipment and an additive pipeline; the input end of the Venturi mixer is connected with the static mixer and the ozonator by pipelines; the output end of the Venturi mixer is connected to the bottom of the reactor by a pipeline; a gas distributor, an activated carbon reaction layer, an overflow trough and a gas-liquid separator are sequentially arranged in the reactor from bottom to top; the gas-liquid separator is connected with a Venturi generator by an ozone circulation pipeline. The cycling treatment system is simple in structure, convenient to use, free from ozone tail gas emission, environmentally friendly, secondary-pollution-free, and high in wastewater treatment efficiency.

Description

technical field [0001] The invention relates to a circulation treatment system for low-concentration cyanide-containing wastewater. Background technique [0002] For the treatment of low-concentration cyanide-containing wastewater, waste water mixed catalysts, pH regulators and ozone gas are generally used, and physical adsorption and catalytic oxidation are carried out through activated carbon (usually low-concentration cyanide-containing wastewater generally refers to the cyanide content in the water. 60mg / l). Ozone can oxidize CN- to CNO-. As the cyanide oxidation process continues, cyanate ions in the solution gradually increase, and about 30% of CNO- is further oxidized and decomposed. The oxidation rate of CNO- is related to the pH value of the reaction. When the pH value is greater than 10, 100% of CNO- continues to oxidize and decompose. If the reaction pH is lower than 10, the remaining CNO- will be hydrolyzed. When activated carbon is in contact with wastewater ...

AI Technical Summary

Problems solved by technology

[0003] The traditional reactor treatment equipment has the problems of uneven gas-liquid distribution and uneven reaction, cannot fully utilize activated carbon, and has a complex structure, troublesome operation, difficult internal cleaning of the reaction tower, low ozone production rate of the system, and low ozone utilization rate , the mixing effect is not good, the energy consumption is large, and there is direct emission of ozone tail gas. The tail gas may also contain other harmful gases, pollute the air, and lead to the removal of water vapor and ozone, and the ozone utilization rate is low

Images