Restaurants are one of the largest organic waste sources in a region, but waste from restaurants has not been treated well, resulting in it ends directly in a landfill. Black soldier fly (BSF) treatment is an emerging technology that can turn organic waste into high-protein feed. The utilization of BSF is carried out by converting organic waste into BSF larvae. BSF larvae are an effort that can be used for recycling organic waste. Therefore, special attention is needed for the utilization of organic waste from restaurants. This study aims to determine the effectiveness of BSF larvae utilization in restaurant waste processing and observe the influence of the environment, particularly the intensity of light on the development of larvae. Organic waste from restaurants is set to a moisture content of 80%. The organic waste is used as a food source for larvae with exposure to three different lighting variants, namely 12 hours of light and 12 hours of darkness, 24 hours of darkness, and 24 hours of light. The results of this study indicated that restaurant waste could be processed with the help of BSF. Variation of light to larvae resulted in a decrease in waste by 37.77%, 37.78%, and 37.60%. The highest reduction occurred in dark lighting conditions 24 hours. Statistical tests show that light intensity has a significant effect on larvae weight.

Lake Toba area is one of the priorities for developing tourist destinations in Indonesia. As a strategic national tourism area, it is necessary to identify aspects of the tourism area development that are not yet optimal to increase the number of tourist visits to that location. This study aims to assess the cleanliness of tourist sites in Lake Toba based on the assessment of tourism site stakeholders, namely visitors, local businesses, and cleanliness managers. The tourist sites in Lake Toba studied were Pasir Putih and Bukit Holbung. This study found that Pasir Putih and Bukit Holbung were considered dirty, with a cleanliness index of 2.63 and 2.60. The assessment shows that access to the cleaning facilities in the two tourist sites is difficult to reach. However, regarding the completeness of the cleaning facilities, Pasir Putih is considered better with an average index of 2.94 compared to the cleaning facilities in Bukit Holbung, which are considered inadequate with an average index of 2.43. The number of tourists visiting a tourist site is directly proportional to the waste generated, and the habits of tourists who visit also affect the cleanliness of a tourist site.