Tropical Aquatic and Soil Pollution

Environmental Fate, Toxicity, and Mitigation of Per- and Polyfluoroalkyl Substances (PFAS): Advances in Source Reduction and Sustainable Alternatives

2026-08-06T06:53:55+00:00

Per- and polyfluoroalkyl substances (PFAS) were widely recognized as emerging environmental pollutants due to their extensive distribution across ecosystems. PFAS were synthetic chemicals composed of alkyl chains bonded to multiple fluorine atoms, and they had been detected in various environmental compartments, including rivers, soil, oceans, and the atmosphere. These compounds originated from a wide range of industrial and consumer products such as textiles, non-stick cookware, aqueous film-forming foams (AFFFs), and cosmetics. Once released into the environment, PFAS persisted for long periods and exhibited toxic effects on both ecosystems and human health. The exceptional stability of PFAS was attributed to the strong carbon–fluorine (C–F) bonds, which were among the strongest in organic chemistry due to fluorine’s high electronegativity. As a result, PFAS were commonly referred to as “forever chemicals” because of their extreme resistance to degradation. Their persistence and bioaccumulative properties had made PFAS contamination a global environmental and public health concern. In response, various source reduction strategies were implemented, including the substitution of PFAS with alternative chemicals, regulatory policies, and increased consumer awareness. In parallel, green chemistry had emerged as a promising approach for developing safer and more sustainable alternatives, such as biopolymers, fluorine-free materials, and short-chain PFAS substitutes. However, further research was still required to improve the performance, safety, and scalability of these alternatives. This study aimed to discuss the sources and environmental impacts of PFAS, evaluate source reduction strategies, and examine green chemistry-based alternatives. It also identified key challenges and outlined future research directions needed to enhance the development and implementation of effective PFAS replacements.

Effectiveness of Gradual Filtration Technology for Drinking Water Quality and Student Competence in Jayapura, Indonesia

2026-10-16T00:56:13+00:00

Access to safe, high-quality drinking water remains an unmet basic need in many religious educational institutions, particularly Islamic boarding schools in Papua. This study evaluated pretest–posttest changes associated with an appropriate-technology multi-stage filtration system designed to improve drinking water quality and students’ water-management competencies at Papua Madani Boarding School (PMBS), Jayapura City. Using a pre-experimental one-group pretest–posttest design, the study involved 45 students, of whom 20 senior students were selected as the primary intervention group. The intervention included six training modules and the construction of a filtration system with a capacity of 1,000 L/day. Data were collected through laboratory analyses of water-quality parameters and assessments of student competencies. The results were analyzed descriptively because the available data did not support inferential statistical testing. Total dissolved solids (TDS) decreased from 559 mg/L to 88 mg/L, color decreased from 11 to 6 NTU, and total coliform decreased from >100 CFU/100 mL to 0 CFU/100 mL. Student competency scores increased from 18% to approximately 85%. These findings indicate that integrating appropriate filtration technology with capacity-building activities has the potential to support sustainable drinking water management in Islamic boarding schools.

Physicochemical and Microbial Analysis of Deep Well Water in Sitio Cabalawan, Barangay Rizal, Surigao City: Implications for Domestic Use and Health

2026-08-06T06:53:54+00:00

Groundwater from deep wells was the primary source of domestic water for many rural communities in the Philippines. However, routine groundwater quality monitoring remained limited, increasing the risk of exposure to physicochemical and microbiological contaminants. This study evaluated the quality of untreated deep-well water in Sitio Cabalawan, Barangay Rizal, Surigao City, Philippines. Water samples were collected from three groundwater supply configurations: a communal hand pump, a household hand pump, and a household faucet supplied through an elevated storage tank. Physicochemical parameters, including temperature, pH, total dissolved solids (TDS), nitrate, and iron, together with microbiological indicators comprising heterotrophic plate count (HPC), total coliforms, and thermotolerant (fecal) coliforms, were analyzed using standard laboratory methods and compared with the Philippine National Standards for Drinking Water (PNSDW) and the World Health Organization (WHO) Guidelines for Drinking-water Quality. The results showed that pH, nitrate, and iron concentrations complied with both PNSDW and WHO standards, whereas TDS exceeded the PNSDW acceptable limit at two sampling sites. In contrast, microbiological analyses revealed elevated HPC in all samples, total coliforms at every sampling site, and fecal coliform contamination in water collected from the household storage and distribution system. These findings suggested that while groundwater chemistry remained generally acceptable, microbial contamination likely occurred during post-extraction storage and household distribution. The study concluded that untreated deep-well water was microbiologically unsuitable for direct human consumption despite meeting most physicochemical standards. The findings highlighted the need for routine groundwater monitoring, improved well protection, proper storage and distribution infrastructure, and household water treatment to reduce waterborne disease risks and support integrated groundwater quality management in flood-prone rural communities.

Evaluation of the Waste Reduction Program in Cihaurgeulis Subdistrict, Bandung City, Indonesia

2026-09-29T02:25:38+00:00

Waste reduction at the subdistrict level was assessed not only based on the availability of facilities but also on source separation, household participation, and the amount of waste actually diverted. This study evaluated the waste reduction program in Cihaurgeulis Subdistrict, Bandung City, which was implemented with assistance from YPBB. The study used secondary data from June 2025 and documentation of the existing waste management system. The analysis was conducted descriptively and quantitatively by examining household sorting rates, waste generation, waste composition, and waste reduction, while the program's achievement was benchmarked against the 30% national reduction target and findings from previous community-based studies. The results showed that 980 of 2,323 households (42.19%) had sorted their waste. Total waste generation reached 92,814.93 kg/month, with residual waste representing the largest fraction at 46,374.11 kg/month (49.96%). The amount of waste reduced was 46,440.82 kg/month, equivalent to approximately 50.04% of the total waste generated, consisting of 35.73% organic waste and 14.31% inorganic waste. Within the organic waste stream, only 10.93% of the total waste generated was treated within the area, whereas 24.80% depended on city-scale treatment. Although this achievement exceeded the 30% reduction target, the program still required improvement because residual waste remained high, sorting performance varied among neighborhood units, and local organic waste treatment capacity was limited. Program improvements should focus on repeated household education accompanied by monitoring, stronger field coordination, standardized waste-bank recordkeeping, and increased organic waste treatment capacity near the source.