Laboratory Waste Treatment Hazardous and Toxic Materials (B3) the Rest of PCB Etching Using the Electrolysis Method
DOI:
https://doi.org/10.33795/jartel.v15i4.6352Keywords:
Processing, Waste Water, Liquid Waste, PCB Etching, Electrolysis, Electrode, IronAbstract
Wastewater from the PCB etching process from laboratory activities is included in hazardous materials B3 because it contains heavy metals that can pollute the environment and have a negative impact on the human body. So far, the wastewater has only been discharged into the environment diluted approximately 20x to 30x using water. Meanwhile, the standard value limit for wastewater quality has been set by the Government as a reference in determining the limit of heavy metal levels in wastewater. One of the processing methods that can be applied to reduce the content (reduction) of heavy metals in wastewater is the electrolysis method. The tool used is an electrolysis reactor using an electrolysis tank. In this study, the electrode material used was an iron plate, with dimensions of 15 x 4 cm, the distance between the two was 2 cm. With a duration of 60 minutes, and a supply voltage of 12V DC and a waste concentration of 271 ppm. The solution consists of a mixture of HCl + H2O2 + H2O with a ratio of 1:2:7. The results of data analysis between water dilution and electrolysis processing showed a reduction in copper (Cu) content of 57.9% from 0.495mg/L to 0.2869mg/L, lead (Pb) 21.5% from 0.020mg/L to 0.0043mg/L, zinc (Zn) 42.6% from 0.080mg/L to 0.0341mg/L. Based on the analysis of this research data, it can be concluded that the electrolysis waste treatment method is better than just dilution, and that wastewater with the two treatment methods is safe to be discharged into the environment, because the heavy metal content in wastewater is still below the wastewater quality standards set by the Government.
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