A treatment method for low-concentration complexed copper-containing wastewater

Abstract

The invention discloses a treatment method of low concentration waste water with complexing copper. The method comprises the steps that pH of waste water is adjusted to range from 4.0 to 10.0, sodium hydrosulfite (Na2S2O4) with high reducibility is added into the waste water, and after a reaction is conducted, the complexing copper and bivalent copper in the waste water are reduced into elemental copper particles; industrial quicklime (CaO) is added to adjust pH to 9.0 to conduct chemical precipitation, and anionic polyacrylamide (APAM) is added to conduct enhanced flocculation; quiescent settling is conducted on obtained waste water, and biochemical treatment can be further conducted on effluent. Compared with the prior art, the treatment method of the low concentration waste water with the complexing copper has the advantages that free copper and complexing copper in a water body can be treated, complex breaking effect is good, the effluent can reach the national discharge standard steadily, secondary pollution does not exist, reagent dosage is less, the treatment cost is low, alumen ustum is big and prone to settlement and separation, operation steps in the process are easy to control, and the treatment method of the low concentration waste water with the complexing copper is prone to be combined with existing techniques.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment method for low-concentration complex copper-containing wastewater. Background technique [0002] Complexing heavy metal wastewater has always been a difficult and hot spot in the field of industrial wastewater, especially in recent years, with the increasing output and scale of electronic products, electroplating and chemical plating, a large number of complexing agents have increased the discharge of heavy metal wastewater, and a large number of The use of a new complexing agent makes heavy metal ions and EDTA, citric acid, NH 3 A state such as the formation of a complex exists. [0003] Complex copper wastewater generally refers to (EDTA-Cu) wastewater, and may also contain a small amount of complexed copper ions and free copper ions such as copper ammonium ions. Due to its complex composition, Cu 2+ The binding ability between the ligands of the complexing agent i...

AI Technical Summary

Problems solved by technology

[0007] 3) FeSO 4 Law is in Fe 2+ Also under strong acidity (pH 2.0-3.0), the Cu in water 2+ The binding force between reduction and EDTA is no longer stable for Cu + , adding alkali to generate cuprous hydroxide precipitation (Chinese patent application CN 103183421 A discloses a treatment method for wastewater containing complexed copper, open date July 3, 2013), FeSO 4 The main advantage of the method is that the cost of breaking the network is relatively low, but the disadvantage is that the water quality will turn yellow after treatment, the amount of mud is large, the sedimentation effect is not good enough, and the mud needs to be discharged repeatedly

(Ju Feng, et al. The internal electrolysis method of iron filings processes the complexed copper ions in EDTA solution, Journal of Environmental Science, 2005, Volume 31, No. 5, 898~904 have reports); Heavy metals easily saturate the exchange resin, and the complexes are easy to pollute or age the exchange resin; electrolysis consumes a lot of power and handles heavy metal types, so it is rarely used.