Industrial production will produce a large number of electroplating wastewater, these wastewater can not be directly discharged, the need for which the heavy metals and other filtration exclusion before discharge, in which the polyacrylamide will be used to deal with, then how to choose the anionic and cationic polyacrylamide in the process of using flocculants?
Characteristics of electroplating wastewater sewage: this type of wastewater is generally strong acidic water quality, water quality is complex, the composition is not easy to control, which contains chromium, cadmium, nickel, copper, zinc, gold, silver and other heavy metal ions, some of which belong to the carcinogenic, teratogenic, mutagenic and highly toxic substances. These heavy metals into the water body, in the food chain has an amplification effect, can be accumulated in some organs of the human body to cause chronic poisoning, endangering human health.
In the treatment of electroplating wastewater, because its wastewater contains many expensive heavy metals, if the heavy metals in the wastewater as a resource to recover, not only solves the pollution of heavy metals, but also has certain economic benefits.
Currently, the commonly used heavy metal wastewater treatment methods mainly include chemical precipitation, reduction, adsorption, membrane separation, coagulation, ion exchange, electrochemical method and so on. It is found that the result of polyacrylamide selection for treating this type of wastewater has a direct relationship with the ph value of this wastewater, due to the fact that most of this type of wastewater is carried out under strong acid conditions.
Polyacrylamide for electroplating wastewater use and precautions
1, polyacrylamide through a small test to determine the model, as well as the dosage of the product.
2、Products are prepared into a 0.1% (refers to the solid content) concentration of aqueous solution, to neutral water without salt is appropriate.
3、When dissolving water, the product is evenly sprinkled into the stirred water, and the solution can be accelerated by adding temperature (<60℃) appropriately.
4、Packed in polypropylene woven bag lined with plastic bag, 25kg per bag.
5、Solid products should not be scattered on the ground, in order to prevent the product from absorbing moisture and make the ground slippery.
6、When preparing aqueous solution of polyacrylamide, it should be carried out in enamel, galvanised, aluminium or plastic drums, and should not be prepared and stored in iron containers.
7、When dissolving, it should be noted that the product should be added evenly and slowly into the dissolver with stirring and heating measures, solidification should be avoided, the solution should be prepared at suitable temperature, and prolonged and over-dramatic mechanical shear should be avoided. It is recommended that the agitator 60-200 rpm, otherwise it will lead to polymer degradation and affect the use effect.
When most of electroplating wastewater is under strong acid condition, generally we choose cationic type, and for coagulation under alkaline condition, generally we choose anionic polyacrylamide with ultra-high molecular weight as coagulant aid.
The main products of flocculant manufacturer Xinhuan Water Treatment are:
White polyaluminium chloride (food grade),
drinking grade polyaluminium chloride,
industrial grade polyaluminium chloride,
anionic polyacrylamide,
cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polymerized iron and aluminium chloride, and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：86 15936201203 Email：maggie@xhwtm.com Contact:Maggie
