Are there heavy metals in printing and dyeing wastewater? If so, which work section generated it?
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The company has recently collaborated on a project with a wastewater treatment plant in a printing and dyeing industrial park, focusing on the removal of heavy metals from wastewater. According to the information available, the pigments and dyes used in the latest dyeing and finishing processes do not contain heavy metals (old processes did contain them). So, could wastewater from other processing stages contain heavy metals? For example, if the acids and bases used are recycled waste acids and waste bases, could heavy metals be introduced?
First, determine whether it is only printing and dyeing wastewater that is sent to the sewage treatment plant; it’s possible that there are other sources as well. In printing and dyeing wastewater, metal ions are generally not present. However, in the sewage treatment plant of the industrial park, the volume of water is large, so even if metal ions are present, their concentration is very low. These can be removed using resin adsorption, which is a simple and efficient method. We can communicate if needed.
There may be metal ions in the waste acid, but it’s unlikely that there are metals in the alkaline solution; in most cases, metals settle out. What specific heavy metals are present in the water of the industrial park?
This post was last edited by Gorō Bagua Stick on 2015-7-15 at 15:27. It can be handled; in water it generally exists in the form of anionic ions. We can communicate.
There definitely are, as the new standards are quite strict; you will likely still have to deal with issues related to trace amounts.
Well, it depends on what kind of wastewater or alkali waste you will be using. Metal complex dyes contain elements such as antimony, arsenic, lead, cadmium, chromium, and copper. Waste acid also contains many impurities, such as heavy metal impurities like nickel, chromium, lead, etc.
Generally, in the color-fixing stage, heavy metal ions such as lead and chromium may be introduced, which are contained in the color-fixing agents