Method for treating high-concentration copper-containing wastewater through ph adjustment

Abstract

The invention relates to a method for treating high-concentration copper-containing wastewater through ph adjustment. The method comprises the following steps of: (1) firstly, adjusting the pH of the wastewater to be 11.5-12.5 by using sodium hydroxide, adding polyaluminum chloride and stirring for 2-5 min, wherein the dosage of the polyaluminum chloride is that the concentration of the polyaluminum chloride is 200 ppm; (2) then, adding trisodium thiocyanate trimer and stirring for 2-5 min, wherein the dosage of the trisodium thiocyanate trimer is that the concentration of the trisodium thiocyanate trimer is 50 ppm; and (3) finally, adding negative ions, thoroughly stirring for 10-20 min, precipitating for 10-20 min, filtering, and detecting the copper content of filtered water, wherein the dosage of the negative ions is that the concentration of the negative ions is 4 ppm. The method has the beneficial effects that the method has the advantages of low cost, low dosage, no secondary pollution, no production of odorous gases, and the like, and has a better removal effect on copper of various forms in water, and the copper removal ratio is high.

Description

technical field

[0001] The invention relates to a copper-containing wastewater treatment technology, in particular to a method for treating high-concentration copper-containing wastewater by adjusting the pH value. Background technique

[0002] With the development of smelting, metal processing, machine manufacturing, organic synthesis and other industries, the amount of wastewater discharged from industrial production is also increasing, and the content of copper ions in wastewater is also increasing. Copper-containing wastewater is extremely harmful to animals, plants and humans. If copper-containing wastewater is used to irrigate farmland, copper ions will be fixed in the roots of plants, affecting nutrient absorption and seriously affecting the growth of crops; after copper-containing wastewater enters the water body, copper can be released It is enriched in organisms and transformed into more toxic heavy metal organic compounds, which can easily enter the human body thr...