The recirculating aquaculture system (RAS) is a cultivation system that minimizes water changes and can optimize high stocking densities (SD). The purpose of this study was to determine the effect of nursery culture in high stocking density with RAS on survival rate (SR), specific growth rate (SGR), relative length (LR), weight gain (WG), length gain (LG)and feed utility efficiency (FUE) of juvenile catfish. The study used a completely randomized design with 4 treatments and 3 replications: R3000 (SD of 3,000 fish/m2 with RAS); NR3000 (SD of 3,000 fish/m2 without RAS); R4000 (SD of 4,000 fish/m2 with RAS); NR4000 (SD of 4,000 fish/m2 without RAS). Juvenile catfish measuring 3.3±0.2 cm were reared for 21 days and water changes were carried out every 2 weeks in the RAS and every 2 days in the non-RAS. The results showed that the SR was not significantly different for all treatments. The highest SGR, LR, WG, LG and FUE were shown in the R4000 treatment (p<0.05). Water quality parameters, especially total ammonia nitrogen in the RAS treatment had a lower value than without RAS. The abundance of total bacteria in the RAS treatment was more than without RAS. This study showed that the density of 4,000 fish/m2 with the RAS was able to provide better catfish nursery production performance than without RAS.

One of the domestic wastes is sewage sludge. Sludge is processed at the Sludge Treatment Plant (IPLT). The IPLT was built with the aim of protecting the environment from pollution due to the direct disposal of feces into receiving water bodies or local land. One of the obstacles in the operation of IPLT is human resources, so it is necessary to increase the capacity of IPLT operators. The purpose of implementing this community empowerment is to increase institutional capacity to improve IPLT performance. The form of capacity building is to socialize the operational techniques of the IPLT processing unit. The socialization is held in September 2020. The method of activity is material presentation and focus group discussion. Indicators of the success of this activity are IPLT processing based on standard operating procedures and monitoring of IPLT so that operations can be optimized and IPLT capacity can be used optimally to increase income.

At Troketon’s Municipal Solid Waste Landfill (MSWLF), waste management adopts the controlled landfill method. The solid waste that enters the MSWLF of Troketon is increasing every day. Without processing, the incoming waste is directly dumped into a landfill. It causes the landfill capacity in the active zone to decrease so that the landfill’s service life decreases faster. This study aimed to calculate the capacity of the used landfill to determine the useful life of the landfill. It also aimed to compare the service life of MSWLF with the processing and composting process. This research took place from January 2019 to May 2021. This research conducted interview techniques, and literature studies. Estimating the waste generation rate projections were based on data in 2020 by using an excel program to calculate waste reduction and its service life. The average rate of the waste generation entering MSWLF of Troketon was 0.07% per year with 48% biodegradable waste composition. The results revealed that these operating landfill zones could extend their service life by composting process. MSWLF with the composting process saves capacity by 136.99 m3/day and 712 days’ longer service life than without composting.

Electrokinetic remediation (EKR) technology has been applied in both lab and pilot scales to actual size since 1993. Recently, sustainable measures for EKR have been relatively considered a form of minimizing resource use during land restoration. This study aims to identify the environmental footprint assessment tools that arise during the EKR process according to the scale of the application. 284 scientific literature indexed by Scopus and the Web of Science during 2011-2021 was analyzed using the Systematic Literature Review (SLR) method, and the results were visualized using the VOSviewer application. The investigated parameters included the amount of scientific literature, year of publication, topics of scientific literature, authors of literature and their country of origin, names of reputable journals, and a number of citations. Research results from 43 scientific literature studies show that different environmental footprint analyses in EKR have been applied in various parts of the world. Most of environmental footprint assessment tools used by researchers include life cycle assessment (LCA) and green and sustainable remediation (GSR) tools. A recommendation is given to the GSR tools developed by the US EPA because known to have the simplest analytical method compared to other methods.

The solution to solve these challenges is the waste management. The waste management is needed to solve starting from upstream to downstream. The waste management in downstream is in the landfill. The management Landfill not only manages solid waste but also waste water treatment. One form of waste water treatments in a landfill is the leachate treatment. The leachate treatment is a priority for management in landfill because it can reduce water, soil, air pollution in the landfill and the surrounding environment. In order to determine the best option among several alternatives to manage the leachate treatment, this research used Analytic Network Process (ANP) with three levels (actors, criteria, and alternatives). Secondary and primary data collection was carried out from April until June 2019 in Indonesia. Data were collected through a survey using questionnaire instrument. Participants of questionnaire amount of 20 people. The participants from lecturers, government, and society. The finding of this research showed that the leachate treatment using coagulation-flocculation was easier to be used in Indonesia.