Treatment method of steel component hot-galvanizing waste water

Abstract

The invention discloses a treatment method of steel component hot-galvanizing waste water. The treatment method of steel component hot-galvanizing waste water comprises the following steps of firstlyrespectively performing pre-filtering and impurity removal on alkali washing degreasing liquid, acid washing liquid and rinsing liquid; then, performing mixing; next, regulating the PH value to alkaline condition for separating ferric hydroxide precipitates; next, regulating plating assistant waste liquid containing rich zinc ions and ammonium ions to be similar to the neutral state; removing thezinc ions; next, mixing the two solutions; adding the two solutions into a biochemical filter pool; removing nitrogen elements and other harmful substances in the system through denitrification and nitrification reactions; next, taking precipitates; performing impurity removal to obtain clear liquid to be used for producing rinsing water or workshop cleaning water. According to the invention, by using the mode, the degreasing waste liquid, acid washing waste liquid and plating assistant waste liquid in the hot-galvanizing process can be treated at the same time; the drug dosage in the waste liquid treatment is reduced; the goals of realizing the repeated utilization of water resources, saving the resources, protecting the environment and lowering the operation cost are achieved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for hot-dip galvanizing wastewater of steel components. Background technique [0002] Power tower components are generally surface treated by hot-dip galvanizing before leaving the factory to improve the corrosion resistance of the components. The hot-dip galvanizing process generally includes: degreasing and derusting-rinsing-pickling-rinsing-helping-galvanizing-passivation and other steps, in which degreasing and derusting, pickling, galvanizing and passivation will produce a large amount of polluting wastewater. At present, there are two commonly used treatment methods for this type of chemical wastewater. One is to separate this type of wastewater from the source, and then select the respective methods according to the characteristics of each wastewater. Although this method has a high recovery efficiency, the process route A lot of investment, time-con...

AI Technical Summary

Problems solved by technology

The hot-dip galvanizing process generally includes: degreasing and derusting-rinsing-pickling-rinsing-helping-galvanizing-passivation and other steps, in which degreasing and derusting, pickling, galvanizing and passivation will produce a large amount of polluting wastewater. At present, there are two commonly used treatment methods for this type of chemical wastewater. One is to separate this type of wastewater from the source, and then select the respective methods according to the characteristics of each wastewater. Although this method has a high recovery efficiency, the process route A lot of investment, time-consuming, labor-intensive, and high operating costs; in addition, all the wastewater is directly mixed, and superimposed with certain processes in general, without considering the characteristics of the wastewater, resulting in low wastewater treatment efficiency, large amount of drug addition, and high unit operating costs

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