There are many processes and a long process, which need to go through about 6 chemicals and 6<br>Water washing process, therefore, consumes a lot of electricity, water and chemicals, including toxic substances such as formaldehyde and is not easy to be biodegraded<br>As a result, it is difficult to treat wastewater, and the discharge of wastewater containing heavy metals and chemicals is also serious to the environment<br>Pollution.<br>
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