Is pickling and passivation waste liquid considered hazardous waste? How to deal with it?
Thread Content
As title
If you plan to take it away directly, it does constitute hazardous waste; if it is processed on-site, it counts as wastewater.
Aren’t acid washing and passivation waste liquids all neutralized? Why is it still considered hazardous waste?
Have the heavy metals been treated?
Not really. What are heavy metals mainly referring to? Even if it’s not transported outside the factory, heavy metals are still present – so how are they dealt with?
Chromium, zinc, copper, lead… there are many. To determine exactly what elements are present, testing is required, followed by appropriate treatment. Common heavy metal treatment methods include precipitation, electrolysis, and redox reactions; the specific method to be used depends on the concentration of the metals. It should be noted that the residues resulting from treatments such as precipitation methods also constitute hazardous waste; however, their quantity is much smaller than that of liquid waste. Hazardous waste is charged based on weight, with the cost in Shandong being around 2,000 yuan per ton.
Thank you, I think I get the concept now