Research on remediation of chromium and cadmium metal contaminated soil using compost has been carried out. Added compost was 5%, 10%, 15%, 20% and 25% w/w. The study was conducted for 14 days and observed a decrease in the concentration of heavy metals in the soil. Measurement of heavy metal concentrations using AAS Perkin Elmer instrument. Based on the results of the analysis, the highest chromium decrease was 92.222% and the highest cadmium was 90.551% in the use of 25% compost.

Waste treatment has been carried out to reduce the presence of contaminants such as the content of copper (Cu) which is very dangerous for health. One of the efforts made is by adsorption using activated carbon. The purpose of this study was to determine the efficiency of activated carbon adsorption on Cu in wastewater by using laboratory scale prototypes. Determination of Cu concentration using AAS while the morphology was determined using SEM. The results showed that activated carbon was able to reduce the concentration of Cu in the waste up to 98% with a mass of carbon 125 grams and an interaction time of 5 hours.