Method for detoxifying, emission-reducing and deeply treating wastewater of electronic electroplating industry

Abstract

The invention discloses a method for detoxifying, emission-reducing and deeply treating wastewater of electronic electroplating industry. The method disclosed by the invention integrates the processes of micro-electrolyzing and breaking complex of iron-carbon, collecting via a heavy metal collector, coagulating and precipitating, biologically contacting and oxidizing, secondarily precipitating and absorbing via modified chitosan for detoxifying, reducing emission and deeply treating wastewater of electronic industry. The method disclosed by the invention is characterized in that the emission of secondary treatment (biochemical pool) wastewater is further reduced on the basis that the main indexes reach the national standard and toxic organic matters mainly consisting of benzene series are removed; and meanwhile, the wastewater can be deeply treated, so that the recycled water reaches the membrane-feeding requirement and separates are recycled.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and specifically relates to a method for detoxification, emission reduction and advanced treatment of wastewater in the electronic electroplating industry. Modified chitosan adsorption" integrated technology has realized the advanced treatment of wastewater in the electronic electroplating industry. Background technique [0002] The wastewater in the electronic electroplating industry is mainly printed circuit board wastewater and electroplating wastewater. According to CPCA (China Printed Circuit Industry Association) statistics, in the past few years, China's printed circuit boards have grown at a rate of more than 20% per year, and China's printed circuit output has surpassed Japan to become the world's number one; the electroplating industry has since reformed and opened up Since then, it has entered a period of rapid development with the demand for plates in the electronics industry, esp...

AI Technical Summary

Problems solved by technology

This method also has the following problems: ①Heavy metal wastewater is generally acidic, and this method needs to control the pH value of the wastewater above 10. After neutralization and precipitation, the pH value of the wastewater is high, and it needs to be discharged after neutralization with acid; ②In the wastewater When zinc, lead, tin, aluminum and other amphoteric metals coexist, as the pH value of the wastewater increases, the amphoteric metals tend to redissolve, so it is necessary to strictly control the pH value for segmental precipitation; ③ Certain metal ions will interact with the halogens present in the wastewater , cyanide, humus, etc. form very stable complexes, which are difficult to remove by neutralization and precipitation, and the wastewater needs to be pretreated; ④The precipitation of hydroxides generated by heavy metal ions in alkaline media will decrease with the pH value Dissolution again, causing secondary pollution

The wastewater generally has the following characteristics: ① High organic matter content; ② High pH value, generally greater than 10; ③ Complex composition, often containing diazo resins, alcohols and aromatic compounds; ④ Water quality and quantity fluctuate greatly, making treatment difficult

Images