Printing and dyeing sewage processing method

Abstract

The invention discloses a disposing method of printing and dyeing effluent, which is characterized by the following: adding coagulant in the effluent pipe or outlet through drug spraying pipe; connecting at least one auxiliary pipe on the drug spraying pipe; adding compound element in the coagulant to improve the efficiency of coagulant; blending compound element and coagulant into effluent in the effluent pipe; adopting coagulant from polyaluminium chloride, aluminum sulfate, polyaluminum sulfate, polyferric sulfate, ferrous sulfate or iron trichloride; setting the compound element from calcium chloride, polyaluminium chloride, aluminium sulfate, polyaluminium sulfate, polyferric sulfate, ferrous sulfate, iron trichloride, magnesium chloride, magnesium sulfate, zinc sulfate, active silicon acid, cationic polyacrylamide, diallyl dimethyl ammonium chloride or acrylamide copolymer.

Description

technical field [0001] The invention relates to a treatment method for printing and dyeing sewage, which belongs to the technical field of sewage treatment. Background technique [0002] In printing and dyeing sewage treatment and water purification, coagulation is one of the very important units. It uses coagulants to change the state of particles in water, so that suspended components and colloidal components in water are separated, and under certain conditions, they can be formed. Sedimentation or air flotation separates flocs, and then separates this part of flocs by sedimentation or air flotation. In coagulation treatment, the coagulant used for different types of sewage is the key to treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing printing and dyeing sewage treatment Various coagulants mainly use iron salt or aluminum salt, and do not make a good distinction for printing and dyeing sewa...

AI Technical Summary

Problems solved by technology

In coagulation treatment, the coagulant used for different types of sewage is the key to treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing printing and dyeing sewage treatment Various coagulants mainly use iron salt or aluminum salt, and do not make a good distinction for printing and dyeing sewage; at the same time, the compounding process is also an important unit in sewage treatment, and there is a compounding time in the compounding process For example, in the process of treating printing and dyeing sewage, there are problems such as the slow reaction between the coagulant and the printing and dyeing sewage and the coagulant does not react with the suspended solids in the water, resulting in the metal elements in the coagulant remaining in the water , resulting in secondary pollution, at the same time the reaction of the coagulant is not complete, but also caused the waste of coagulant, and increased the cost of sewage treatment

Images