Nickel-containing wastewater low-emission treatment process

Abstract

The invention relates to the field of sewage treatment, and particularly discloses a nickel-containing wastewater low-emission treatment process which comprises the following steps: adding 80 wt% of sulfuric acid or 60 wt% of sodium hydroxide into nickel-containing wastewater to adjust the pH value to 3-4, adding 40 wt% of hydrogen peroxide, stirring for reaction, adding lime powder, stirring for reaction, then adding a phosphorus removal agent and polyaluminum chloride for stirring reaction, then adding an alkaline agent, adjusting the pH value, then adding a flocculating agent A, stirring for reaction, and then filtering to obtain filtrate; and adding sodium hypochlorite for stirring reaction, adding lime powder and sodium hydroxide for adjusting the pH value, then adding polyaluminum chloride, stirring for reaction, then adding a flocculating agent B, stirring for reaction, then filtering, and completing the treatment of the nickel-containing wastewater. The nickel-containing wastewater is treated by the nickel-containing wastewater low-emission treatment process, so that the total nickel content in the discharged wastewater is less than 0.06 mg / L, and the total phosphorus content is less than 0.07 mg / L.

Description

technical field [0001] The application relates to the field of sewage treatment, more specifically, it relates to a low-discharge treatment process for nickel-containing wastewater. Background technique [0002] Electroless nickel plating wastewater, circuit board nickel-containing wastewater, electroplating nickel wastewater, etc. will produce nickel-containing wastewater. Nickel is a carcinogenic heavy metal and cannot be biodegraded. It can be enriched in the soil and affect the normal growth of plants. Moreover, its waste water flowing into the water will also affect the production of fisheries, and it can cause serious harm to the environment and human health through the accumulation of food chains. Nickel-containing compounds are absorbed by the skin, which will not only cause cancer but also cause the degradation of the human nervous system. Therefore, nickel-containing wastewater must meet certain discharge standards before it can be discharged outside. [0003] At ...

AI Technical Summary

Problems solved by technology

[0004] Although the treatment of nickel-containing wastewater in the prior art has reached the discharge standard, the discharge of nickel is still relatively high. Therefore, it is urgent to develop a process that can reduce the discharge of nickel from nickel-containing wastewater.