<strong>Aim:</strong> The objective of this study is to obtain the optimum efficiency of Lead (Pb) removal by adsorption using shrimp shells chitosan. Adsorption is one of the alternative ways to treat heavy metal. Various substances can be used as adsorbents for the adsorption process. One of the natural adsorbents that can be utilized is shrimp shells. <strong>Methodology and Results:</strong> In general, the process of making chitin into chitosan includes demineralization with dilute HCl, deproteinization with dilute NaOH, then deacetylation of chitin using concentrated NaOH. This study would demonstrate the adsorption on artificial waste containing 100 mg/L of Pb using 1 gram of chitosan with variations in pH (4, 5, 6) and time (30, 60, 90 minutes) to determine the effectiveness of chitosan made of shrimp shells in reducing Pb concentration. The results show that the highest removal efficiency of lead was achieved at pH 4 and 90 minutes duration with a removal percentage of 99.88%. <strong>Conclusion, significance, and impact study:</strong> Chitosan compounds as the results of shrimp shells processing have amine groups (NH₂) which are nucleophiles (rich in electrons). It is favorable to be used as biocoagulants or bioadsorbents of lead heavy metal with a removal efficiency of above 90%.

Museum Penerangan is one of tourist attractions which is visited by tourist to increase the knowledge of lighting development in Indonesia. Museum Penerangan has fire protection system, but the reliability of building safety system of potential fire hazard needs to be known. This research is conducted to acknowledge Museum Penerangan reliability of building safety system. Reliability variables used in this research are the completeness of treads, safety tools, active fire protective systems, and passive fire protective systems. The research obtains the value of reliability of Museum Penerangan building safety system for potential fire hazard is 68,9895, which means Moderate. This value is inadequate to minimum requirements of reliability of building safety system that has value of 80 or Good. Thisis due to safety tools component’s variable that has value of 58,57. It isrecommended forthe Museum Penerangan management to increase or develop the safety tools’ components that have been lacking of function so that the building could have a better reliability level of potential fire hazard.