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Electroplating wastewater treatment
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Keywords: billion groups of environmental protection
Category: Products
Product Details
Plating waste water sources: plating parts cleaning water, waste plating solution, equipment cooling water and other waste water.
The characteristics of sewage, this kind of wastewater is generally strong acid water quality, the 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 and cyanide, some of which are carcinogenic, teratogenic, mutagenic and highly toxic substances.
After these heavy metals enter the water body, they have an amplifying effect on the food chain, and can accumulate in certain organs of the human body to cause chronic poisoning and endanger human health.
In the treatment of electroplating wastewater, because the wastewater contains a lot of expensive heavy metals, if the heavy metals in wastewater as a resource to recover, not only to solve the pollution of heavy metals, but also has certain economic benefits.
At present, the commonly used heavy metal wastewater treatment methods mainly include chemical precipitation method, reduction method, adsorption method, membrane separation method, coagulation method, ion exchange method, electrochemical method and so on. It is found that the type selection results of polyacrylamide for treating this kind of wastewater are directly related to the ph value of the wastewater, because most of the wastewater is carried out under strong acid conditions.
The best use of polyacrylamide for electroplating wastewater and matters needing attention
1, polyacrylamide through small test, to determine the best model, as well as the best dosage of the product.
2. The product is prepared into an aqueous solution with a concentration of 0.1%(referring to solid content), preferably neutral water without salt.
3, dissolved water, the product evenly sprinkled into the stirring water, appropriate heating (<60 ℃) can be accelerated into solution.
4. Solid products are packed in polypropylene woven bags, lined with plastic bags, each 25kg.
5, solid products to avoid sprinkling on the ground, in order to prevent the product moisture after the ground becomes slippery.
6. When preparing PAM aqueous solution, it should be carried out in enamel, galvanized, aluminum or plastic barrels, and cannot be prepared and stored in iron containers.
7, when dissolving, should pay attention to the product evenly and slowly added to the dissolver with stirring and heating measures, should avoid solid, the solution is prepared at a suitable temperature, and should avoid mechanical shearing for a long time. It is recommended that the agitator 60-200 rpm, otherwise it will cause polymer degradation and affect the use effect.
When most of the electroplating wastewater is under strong acid conditions, we generally choose cationic type, coagulation under alkaline conditions, and generally use ultra-high molecular weight anionic polyacrylamide as a coagulant aid.
It should be noted here that due to the characteristics of electroplating wastewater itself, its pH value is relatively high. Before selecting chemicals, it is best to select water samples for beaker experiments to determine the selection and dosage.
Each thousand tons of electroplating wastewater to be treated generally requires 20-100kg of product. The use of polyacrylamide to treat electroplating wastewater is about 2-10 grams. Specific electroplating wastewater with polyacrylamide reagent how much to consider the sewage turbidity, polyacrylamide reagent molecular weight, as well as impurities in the water and other specific circumstances of the site.
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