Media Ilmiah Teknik Lingkungan (MITL)

Utilization of Aloe Vera as a Biocoagulant in the Treatment of Domestic Wastewater (Grey Water) Based on TSS and Total Coliform Parameters

Arristo Pancis Simanjorang — 2026-02-12

Domestic wastewater, which is categorized into black water and grey water, is one of the main sources of water pollution due to its high concentrations of Total Suspended Solids (TSS) and Total Coliform, both of which negatively impact human health and the environment. This study aims to evaluate the effectiveness of Aloe vera as a biocoagulant in reducing TSS and Total Coliform concentrations in domestic wastewater from Housing Complex X, Sirnabaya Village, Karawang Regency, as well as to compare its performance in gel and liquid forms. The research method applied was a laboratory scale experiment using the jar test. Wastewater samples were collected through composite sampling at three different times in one day (08.00, 14.00, 20.00 WIB). The Aloe vera biocoagulant was processed in two forms: gel and liquid. Dosage variations tested were 0, 10, 15, 20, and 25 mL/L. The results showed that the Aloe vera biocoagulant was effective in reducing both TSS and Total Coliform. In the gel form, with the dose of 25 mL/L reached the result 86% for TSS and 76% for Total Coliform, meanwhile for the liquid form reached the result 76% and 73% with 10 mL/L dose. The superior performance of the gel form compared to the liquid is attributed to its more intact active compounds, such as acemannan for TSS and anthraquinones for Total Coliform.

Analysis of Aluminum Sulfate Dosage on Water Quality Parameters in the Coagulation-Flocculation Process

Fadhilah Labibah Nurjanah — 2026-02-12

This study aims to evaluate the performance of aluminum sulfate (alum) coagulant in river water, tofu waste, and batik waste with varying doses on the effectiveness of the coagulation-flocculation process. The method used was a jar test on 1000 mL of water samples, including coagulation for 1 minute at 120 rpm, and flocculation for 20 minutes at 40 rpm, and sedimentation for 15 minutes. The variations in alum doses used were 150 mg/L, 200 mg/L, and 250 mg/L. The results showed that this process caused pH changes during treatment and was effective in reducing turbidity, TSS, and color although the optimum dose differed for each sample. In river water, the optimum dose of 150 mg/L resulted in 98.99% turbidity removal, 81.82% TSS removal, and 99.11% color removal. Meanwhile, for tofu waste, the optimum dose of 250 mg/L resulted in 86.67% turbidity removal, 98.66% TSS removal, and 96.16% color removal. Meanwhile, for batik waste, the optimum dose of 200 mg/L resulted in 97.89% turbidity removal, 95.76% TSS removal, and 91.61% color removal. This indicates that the coagulant dosage needs to be adjusted to the characteristics of each type of sample used.

Water Availability Analysis of the Cilamaya Watershed Using the F.J. Mock Method

Shafa Camilla Az-zahra — 2026-02-12

Water availability is a critical factor in sustainable watershed management, particularly in areas experiencing climatic variability and land-use pressure such as the Cilamaya Watershed in West Java, Indonesia. This study aims to analyze water availability in the Cilamaya Watershed using the F.J. Mock hydrological method based on climatological data and watershed characteristics. The data used include rainfall, air temperature, relative humidity, wind speed, and sunshine duration, which were processed to estimate the water balance and monthly discharge. The results indicate that river discharge in the Cilamaya Watershed exhibits strong seasonal fluctuations, with high flows during the rainy season and a sharp decline during the dry season. During several dry months, the model results show water deficit conditions, as low rainfall is unable to compensate for water losses through evapotranspiration. The dependable flow analysis (Q90) reveals that reliable water availability occurs mainly during the rainy season, while in the dry season the watershed is unable to guarantee a sustainable minimum flow. These findings demonstrate that the Cilamaya Watershed has a high level of hydrological vulnerability, highlighting the need for adaptive water resources management strategies, particularly through strengthening infiltration functions and regulating water use during dry periods.

Analysis of Psychosocial Hazard Potential and Its Implications on the Occupational Safety and Health Performance of Employees in the QC Department of PT Garudafood Putra Putri Jaya, Tbk

Moch Akeyla Anugrah — 2026-02-28

Because it can have an impact on employee performance, work stress is an important issue for businesses. The goal of this study is to assess the degree of stress using a straightforward random sampling technique. The Slovin formula and a 10% tolerance level are used to estimate the sample size. In accordance with the appendix to the Minister of Manpower Regulation (PERMENAKER) Number 5 of 2018 concerning Occupational Safety and Health in the Work Environment, a cross-sectional study was carried out using a quantitative approach with descriptive analysis. Respondents from the Quality Control (QC) department completed the questionnaire. Both the reliability and validity tests yielded reliable results. According to the study's findings, of the 44 responders to the questionnaire, 40 (90.91%) were classified as having mild stress and 4 (9.09%) as having moderate stress. The aforementioned rationale leads to the conclusion that workers in PT Garudafood Putra Putri Jaya, Tbk's Quality Control (QC) department are not overly stressed at work.

Analysis of the Socio-Economic Impact on the Community of Village X Due to the Construction of Hotel X

Muhammad Rizal Rosyadi — 2026-02-12

The construction of Hotel X in a Village, has brought various social and economic changes to the surrounding community. This study aims to examine how the project influences local social conditions, levels of concern, community perceptions, employment opportunities, and household income. A descriptive approach was used by combining primary data obtained through field observations and interviews, with secondary data derived from official documents and relevant literature. The findings indicate that most residents are aware of the development plan and generally show a positive response. The community perceives that the presence of the hotel may create new job opportunities and increase income, although a small number of residents still express concerns regarding the changes occurring during the pre-construction and construction phases. These perceptions are shaped by the information received and the direct experiences of the community throughout the development process. Overall, the construction of Hotel X tends to provide economic benefits for the local population; however, proper management of social aspects remains necessary to ensure that the changes are widely accepted and do not generate tension within the community.

Vegetation Density of Green Open Spaces as a Key Determinant of Outdoor Thermal Comfort on the Universitas Palangka Raya Campus

Waluyo Nuswantoro — 2026-02-28

Outdoor thermal comfort plays a crucial role in supporting daily academic activities, particularly in humid tropical regions characterized by high air temperature and relative humidity. Air temperature and relative humidity were measured at 30 observation points representing different land-cover conditions across the campus area. Outdoor thermal comfort was evaluated using the Thermal Humidity Index (THI), while vegetation density was assessed using the Normalized Difference Vegetation Index (NDVI) derived from Landsat 8 imagery. Statistical analysis was applied to examine the relationship between NDVI and THI. The results indicate a consistent negative relationship between vegetation density and THI. Areas with higher NDVI values tend to exhibit lower THI levels, reflecting more comfortable thermal conditions. In contrast, locations dominated by built-up surfaces and sparse vegetation show higher THI values and experience greater thermal discomfort, particularly during daytime periods. Although the overall proportion of green open space on the campus meets regulatory requirements, the spatial distribution and density of vegetation vary considerably across activity zones. These findings highlight that vegetation density is a key factor in improving outdoor thermal comfort in tropical university campuses. Strategic enhancement of vegetation density, especially in high-activity areas, is essential to support a more thermally comfortable and sustainable campus environment.