http://repository.president.ac.id/xmlui/handle/123456789/13393 2026-04-21T01:39:48Z http://repository.president.ac.id/xmlui/handle/123456789/13396 THE STUDY OF AERATION PROCESS IN WATER PRE-TREATMENT OF PT X IN BEKASI DISTRICT Aulia, Salza Afifa PT X is a clean water company with a continuous process system in raw water treatment. This study evaluates the existing secondary data from the pre-treatment of water at PT X, focusing on characteristics such as dissolved oxygen, iron (Fe), ammonia (NH3) using a continuous aeration system. The purpose of this study is to offer an alternative aeration approach to improve the pre-treatment process in reducing contaminants in water. This research was done on a laboratory scale, employing the batch aeration approach as an alternative to continuous aeration. The equipment employed includes a batch aeration reactor, a chlorination unit, and different measurement instruments for iron, ammonia, pH, turbidity, and dissolved oxygen. Based on data from laboratory-scale studies, the batch aeration system showed considerable improvement in pollutant removal. Specifically, the batch system was able to increase dissolved oxygen by 97% at an air flow rate of 4 l/min, remove 100% of iron, increase pH concentration by 13%. However, in this experiment, the ammonia content did not vary substantially although the turbidity concentration in the water increase by 70%. These data imply that batch aeration may be utilized as an alternate way to minimize pollutants in water in PT X's water pre- treatment process. 2025-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/13395 ECO-ENZYME APPLICATION STUDY ON TEXTILE INDUSTRY WASTE-ACTIVATED SLUDGE IN pH, MLSS, MLVSS, AND ORGANIC CONTENT PERCENTAGE (STUDY CASE: WWTP-1 JABABEKA) Ndruru, Juan Feron The textile industry significantly contributes to wastewater pollution, generating toxic effluent with dyes and organic matter. Biological treatment using activated sludge produces waste-activated sludge (WAS), which contains moisture, organic contaminants, heavy metals, and pathogens, posing environmental risks. This study investigates the potential of eco-enzymes—fermented organic liquids from organic waste—as a sustainable solution for managing WAS. It evaluated changes in pH, mixed-liquor suspended solids (MLSS), mixed-liquor volatile suspended solids (MLVSS), and organic matter content after adding 10% eco- enzymes made from orange, pineapple peel, and mixed organic matter to WAS from a textile wastewater treatment plant in an anaerobic system over 8 days. Results showed that eco-enzymes significantly reduced the pH of the sludge from 8.13 to 5.15, compared to a control that decreased to 7.45. The pineapple peel eco-enzyme reduced MLSS by 32% and MLVSS by 35%, while mixed- organic matter eco-enzyme led to reductions of 29% for MLSS and 31% for MLVSS. The orange eco-enzyme showed the highest reduction, with decreases of 35% for MLSS and 38% for MLVSS. However, the control sludge samples exhibited a higher reduction in organic content (12.12%) compared to those with eco-enzymes (5.6%). While eco-enzymes significantly lowered pH and contributed to reductions in MLSS and MLVSS, variations in statistical significance were noted. Pineapple peel and mixed-organic waste enzymes showed no effect on MLSS reduction on day 4, and mixed-organic waste enzymes were insignificant for MLVSS reduction on day 8. Overall, eco- enzymes effectively aided in the degradation of textile sludge, necessitating careful monitoring of pH levels. 2025-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/13394 STUDY OF DOMESTIC WASTE GENERATION AND COMPOSITION IN RT 06 RW 08, TAMAN WANASARI INDAH HOUSING AREA, CIBITUNG DISTRICT, BEKASI REGENCY Nadhilah, Nur Amalia The problem of domestic waste is an environmental issue that continues to grow along with population growth and household activities. This study aims to determine the existing condition waste management, the amount of waste generation and determine the waste composition of domestic waste in RT 06 RW 08, Taman Wanasari Indah Housing, Cibitung District, Bekasi Regency. The methods used include collecting primary data through direct measurement of waste generation for 8 days and composition analysis based on organic and inorganic classifications. The results of the study showed that the average waste generation per person per day was 0.6 kg/person/day. The composition of the waste was dominated by organic waste such as food scraps and leaves, with a percentage of 29.6% of the total waste. Based on these results, it is recommended to implement community-based waste management through sorting and composting of organic waste to reduce the volume of waste disposed of at the final disposal site (TPA). This study is expected to be the basis for making waste management policies at the smallest environmental level. Objectives: The objectives of this study aim to analyze the existing waste management, the amount of waste generation and composition of domestic waste in RT 06 Rw 08, Taman Wanasari Indah Housing Area, Cibitung District, Bekasi Regency. Method and results: The data source in this study uses primary data collected through direct weighing of household waste for eight consecutive days based on SNI 19-3964-1994. The Sampling using purposive sampling. Conclusion: Waste management in RT 06 RW 08 Perumahan Taman Wanasari Indah is still conventional without sorting from the source, which has an impact on environmental pollution. The average waste generation reaches 0.6 kg/person/day or 1.4 liters/person/day, in accordance with the average in residential areas. The composition of waste is dominated by organic waste (29.6%), plastic (18.7%), and paper (17.3%), in line with the composition pattern in other settlements. 2025-01-01T00:00:00Z