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The impacts of wastewater (liquid waste) include contamination and pollution of surface water and other water bodies utilized by humans, as well as disruption to aquatic life. Wastewater generated from plate washing processes in offset printing industries contains toxic substances that can harm the environment, such as ink pigments, additives, alcohol, and other hazardous chemicals. This study aims to reduce the environmental impact caused by plate washing wastewater. The method used in this research is the Jar Test, which is commonly applied to evaluate the effectiveness of coagulants in water and wastewater treatment. Based on the findings, this method successfully reduced the Total Dissolved Solids (TDS) level by 18%. These results indicate that the use of alum as a coagulant has a significant effect on altering the chemical composition of the plate washing wastewater, thereby contributing to pollution reduction

The presence of heavy metals in waste is one of the variables that can pollute and damage the environment. Lead is one of the chemical contents that can be found in hospital liquid waste. Hospital liquid waste comes from work unit processes throughout the hospital environment which contains dangerous chemicals so it needs to be processed before being discharged into the environment. Research has been carried out using the coagulation-flocculation method using sugar palm seeds as a biocoagulant. The aim of this research is to find out how the palm seed coagulant mass influences in reducing lead (Pb) levels. hospital wastewater with the addition of variations in coagulant mass, namely 0.3%, 0.4%, 0.5%, 0.6% and 0.7%. From the filtrate resulting from coagulation-flocculation which was then analyzed based on the Regulation of the Minister of Environment and Forestry of the Republic of Indonesia Number P.68 of 2016 concerning Domestic Wastewater Quality Standards, from the results of this research it is known that sugar palm seeds as a biocoagulant are able to reduce the most optimal PB concentration when the coagulant concentration is added to 0.6%.