Heavy metal wastewater purificant

Abstract

The invention belongs to the technical field of industrial water treatment and relates to a wastewater purifying agent, in particular to the purifying agent for processing various industrial wastewater (in particular to electroplating wastewater) containing heavy metals. The active ingredients of the purifying agent comprise diatomaceous earth, metal sulfide, sulfite, carbonate and aluminium salt, the percentage contents by weight of various ingredients are as follows, the diatomaceous earth is 30 percent to 35 percent, the metal sulfide is 20 percent to 30 percent, the sulfite is 18 percent to 23 percent, the aluminium salt is 5 percent to 10 percent, and the rest is the carbonate. The wastewater purifying agent can effectively solve the problems of complicated technology, mixed and unclear water quality and complicated electroplating additive of the prior electroplating production technology, thereby leading the wastewater to stably achieve the standards for a long time after the treatment.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment and relates to a waste water purifying agent, in particular to a purifying agent for treating various industrial waste water (especially electroplating waste water) containing heavy metals. Background technique [0002] There are many methods for the treatment of heavy metal wastewater, such as alkaline precipitation, ion exchange, electrodialysis, reverse osmosis, electrocoagulation, etc. At present, the most widely used method is the alkaline precipitation method, which is a method of removing heavy metal ions by forming hydroxide precipitation only by adding alkali to adjust the pH value. This method has simple process, easy operation, and low construction and operation costs, but the disadvantage is that the pH range of the optimal precipitation of various heavy metal ions is different, and it is necessary to add drugs to the precipitation in stages. If complex ions are mixe...

AI Technical Summary

Problems solved by technology

This method has simple process, easy operation, and low construction and operation costs, but the disadvantage is that the pH range of the optimal precipitation of various heavy metal ions is different, and it is necessary to add medicine to the precipitation in stages. If complex ions are mixed in the wastewater, some It is difficult to discharge ions

The ion exchange method is to use the exchange ions in the ion exchange resin to exchange some ions in the heavy metal wastewater to remove them, so that the wastewater can be purified. The disadvantage of this method is that the price of the resin is relatively expensive, and the operating cost is high. Difficult to regenerate, hard to handle concentrated water

Electrodialysis is an electrochemical separation process. It is a membrane process that uses potential difference as the driving force under the action of a direct current electric field to separate