Reducing the phosphate in wastewater from the washing process using eggshell and mussel shell

Abstract

This research studied the factors that affect the efficiency of phosphate reduction in the wastewater of the washing process with CaCO3 and CaO produced from eggshell and mussel shell. The study found that the optimum condition for adsorption when using CaCO3 from eggshell is to adjust the pH to be equal to 10, take 15 minutes to absorb, and add 1 gram of sorbent, which can reduce the phosphate content by 25 percent and when changing the adsorbent to CaO, the optimum condition for phosphate removal is to adjust the pH to 7, take 15 minutes to absorb, and add 1 gram of adsorbent, which can reduce the phosphate content by 24 percent. The optimum conditions for adsorption when using CaCO3 from mussel shell were to adjust the pH to 10, take 45 minutes to absorb, and add 1 gram of sorbent, which can reduce the phosphate content by 25 percent and when changing adsorbents to CaO, the optimum condition for phosphate removal is to adjust the pH to 10, take 15 minutes to absorb, and add 3 grams of adsorbents, which can reduce the phosphate content by 24 percent. In addition, when studying the adsorption of impurities in the wastewater, such as conductivity, turbidity, COD, and BOD, it is found that the optimum reduction conditions can reduce the impurities of the parameters that mentioned above were 19.32, 2.60, 54.77 and 16.67 percent respectively. CaCO3 and CaO, produced from eggshell and mussel shell can be used to absorb impurities in wastewater before releasing into natural water sources.