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Potensi Biogas dan Pupuk dari Limbah Lumpur Kertas Cindy Rianti Priadi; Iftita Rahmatika; Chihiya Fitria; Dwica Wulandari; Setyo Sarwanto Moersidik
Reaktor Volume 16 No.3 September 2016
Publisher : Dept. of Chemical Engineering, Diponegoro University

BIOGAS ENERGY AND FERTILIZING POTENTIAL FROM PAPER SLUDGE Paper sludge contains potential as energy and fertilizer due to the high amount of C, N and P. The aims of this study were to investigate resource recovery potential through biogas production from paper sludge only and with cow manure as co-substrate for 30-45 days in batch anaerobic digestion reactor. In addition, the fertilizer potential from digestate was also tested in Vetiveria zizanioides. Co-digestion with cow manure yielded higher methane gas up to 380 CH4/g VS due to a more optimum C/N ratio. Vetiver plants grown on digestate relatively showed the high growth performance after 4 weeks. The heavy metal accumulation from digestate was still in tolerable amount since the growth rate was not significantly different with the plant grown in fertilizer. Therefore, resource recovery technology can be an option to recover C, N and P in paper sludge to achieve sustainable waste management. Keywords: ananerobic digestion; biogas; fertilizer; paper sludge AbstrakLumpur dari Air Limbah industri kertas memiliki C, N dan P yang tinggi sehingga berpotensi menghasilkan energi dan menjadi pupuk, Penelitian ini bertujuan untuk meneliti pemulihan sumber daya (resource recovery) melalui produksi biogas dari lumpur kertas tanpa dan dengan ko-substrat kotoran sapi selama 30-45 hari dalam reaktor batch anaerobic digestion. Selanjutnya potensi pupuk dari digestat juga diuji dengan tumbuhan akar wangi (Vetiveria zizanioides). Setelah 45 hari, lumpur kertas dengan kotoran sapi menghasikan gas metana yang lebih besar, yaitu 380 CH4/g VS. Tanaman akar wangi yang ditanam dengan dengan digestat R2 tumbuh relatif tinggi setelah 4 minggu. Akumulasi logam berat juga masih dalam batas aman karena laju pertumbuhannya yang masih sebanding dengan tanaman yang diberi pupuk. Oleh karena itu, pemulihan sumber daya dapat diterapkan untuk memanfaatkan C, N dan P yang terkandung dalam lumpur kertas sebagai usaha pengelolaan limbah berkelanjutan. Kata Kunci: biogas; digestasi anaerobik; lumpur kertas; pupuk

Examining the key factors influencing the sustainability of domestic wastewater reuse in Jakarta using AHP method Theresia, Eliza Sinta; Purwana, Rachmadhi; Rahmatika, Iftita
Operations Excellence: Journal of Applied Industrial Engineering Vol. 17 No. 1 March 2025
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/oe.2025.v17.i1.133

Population expansion, urbanization, economic development, pollution, and climate change are all contributing factors to the growing global problem of water shortage. The Sustainable Development Goals (SDGs) are in danger of being achieved because of this dilemma, particularly SDGs 6 and 11 on clean water and sanitation and sustainable cities, respectively. Only 65.9% of Jakarta's population has access to potable water, and water stress levels range from 40 to 80%. The government is planning a wastewater treatment system (SPALD-T) to recycle household wastewater and produce clean water in order to address this issue. TB. Simatupang's Water Treatment Plant (WWTP) still faces obstacles in adopting wastewater reuse, nonetheless. In Indonesia, wastewater recycling has received little attention, with the majority of studies concentrating on technical concerns rather than sustainability considerations. In contrast, technologies such as desalination and rainfall harvesting are being investigated worldwide. The objective of this research is to examine the technical and non-technical elements that affect wastewater recycling's effectiveness for the generation of sustainable clean water. The results will offer crucial information to help Perumda Paljaya create policies that will effectively utilize wastewater, which will help Jakarta accomplish its sustainable development goals more broadly.

Fates of Intracellular and Extracellular Antibiotic Resistance Genes in Full Scale Waste Stabilization Pond Systems Karina, Immanuela; Rahmatika, Iftita; Priadi , Cindy Rianti
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 4 No. 6 (2025): JETBIS : Journal of Economics, Technology and Business
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v4i6.183

Waste stabilization ponds (WSP) are conventional wastewater treatment technologies that utilize biological processes and have become key hotspots for the proliferation of antibiotic resistance genes (ARGs). During the wastewater treatment process, bacterial inactivation may release ARGs into the environment, with two primary phases of presence: intracellular (iARGs) and extracellular (eARGs). The objective of this study was to assess the abundance and removal efficiency of ARGs during the WSP process, and to explore the correlation between ARGs, total bacterial populations, and integron 1 (intl1) as a marker for horizontal gene transfer. The results showed that raw wastewater had iARGs abundance ranging from 4.69×10^5 to 5.99×10^6 gene copies/ml, and eARGs from 5.91×10^3 to 1.04×10^5 gene copies/ml. After treatment through the WSP, intracellular ARGs, intl1, and 16S rRNA genes were reduced by 0.20 to 1.73 logs, while extracellular ARGs were removed by 0.05 to 0.79 logs. Interestingly, intl1 and 16S rRNA genes showed amplification at the outlet of the wastewater treatment plant by -0.21 and -0.87 logs, respectively. The study revealed that the relative abundance of ARGs was higher in the extracellular phase, with iARGs and eARGs showing values from 7.75×10^-5 to 4.52×10^-2 and 1.33×10^-4 to 1.58×10^-1, respectively. A significant positive correlation was observed between ARGs and the total bacterial population, as well as with intl1, indicating the potential for co-occurrence and horizontal gene transfer in the microbial community within wastewater. This research highlights the environmental implications of ARGs persistence and proliferation in wastewater treatment processes, offering insights into the management of ARGs in wastewater treatment systems.

Fecal ingestion rate based on worker activity patterns during stool handling in a ruminant farm Paramitadevi, Yudith V.; Priadi, Cindy R.; Rahmatika, Iftita; Rukmana, Andriansjah
Narra J Vol. 5 No. 2 (2025): August 2025
Publisher : Narra Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52225/narra.v5i2.1989

Farm workers who handle livestock stools face an increased risk of infection by pathogenic bacteria, such as Escherichia coli O157 and Salmonella spp., leading to millions of severe health issues and thousands of fatalities annually. The aim of this study was to assess the impact of these pathogens by measuring their concentrations, determining rates of unintentional fecal consumption, and conducting a quantitative assessment of microbial risk. An integrated farm in Sukabumi City, Indonesia, was examined for E. coli O157 and Salmonella spp. in livestock stools. Additionally, the study monitored the rate of incidental fecal ingestion among farm workers. Stool samples were collected (n= 40) from ruminants and analyzed following ISO 16649-1:2018, ISO 9308-1:2014, and ISO 6579-1:2017/Amd.1:2020. The study tracked worker’s behavior daily to determine the contact time. The fecal ingestion rate was calculated by multiplying the estimated stool weight ingested by the contact time workers spent cleaning livestock stools in the barn each day. Microbial analysis revealed that the highest concentration of E. coli O157 in beef cattle stools was 2.49 log10 CFU/g. The study determined mean fecal ingestion rates during the dry season (8.64 mg/day) and rainy season (6.84 mg/day). Results from the quantitative microbial risk assessment showed that stool from beef cattle posed a higher risk of E. coli O157 infection compared to other ruminants, with an estimated disease burden of 9.8 × 10-3 pppy. This study represents the first comprehensive quantitative evaluation of fecal ingestion by farm workers during animal husbandry. The findings underscore the need for improved worker safety measures, such as enhanced sanitation practices and protective equipment, to mitigate the risks of handling livestock stools.

Comparison of Water Quality Monitoring Between Citizen Science and Researchers: A Case Study in The Bantimurung River Zefanya, Anastasia; Rahmatika, Iftita
Journal Of Social Science (JoSS) Vol 4 No 6 (2025): JOSS: Journal of Social Science
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/joss.v4i6.466

The Bantimurung River, a vital water source in the UNESCO-listed Maros Karst Area, faces increasing pollution threats from anthropogenic activities. While conventional water quality monitoring by experts is accurate, its high cost and limited scalability hinder widespread implementation, particularly in developing regions. Citizen science has emerged as a promising alternative, offering cost-effective and participatory environmental monitoring. However, questions remain about the reliability of data collected by non-experts. This study compares water quality measurements—including temperature, pH, dissolved oxygen (DO), nitrite, ammonia, and phosphate—taken by citizen scientists and professional researchers in the Bantimurung River. Data were collected at seven sampling points over four weeks, using both field test kits and laboratory analyses. Statistical methods, including Shapiro-Wilk normality tests, paired t-tests, Wilcoxon Signed-Rank tests, and linear regression, were employed to evaluate data consistency. Results revealed high accuracy for physical parameters (pH, temperature, DO), with insignificant mean differences and strong correlations (R² > 0.7). However, chemical parameters (nitrite, ammonia, phosphate) showed significant discrepancies due to limitations in portable tools and field procedures. The findings highlight the potential of citizen science for scalable monitoring of basic water quality indicators, while underscoring the need for tool calibration and laboratory validation for precise chemical analysis. This research contributes to the growing discourse on participatory environmental monitoring, offering practical insights for policymakers and conservationists. By integrating citizen science with professional methods, sustainable water quality monitoring can be achieved, balancing cost-efficiency and accuracy in ecologically sensitive areas.

Fates of Intracellular and Extracellular Antibiotic Resistance Genes in Full Scale Waste Stabilization Pond Systems Karina, Immanuela; Rahmatika, Iftita; Priadi , Cindy Rianti
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 4 No. 6 (2025): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v4i6.183

Waste stabilization ponds (WSP) are conventional wastewater treatment technologies that utilize biological processes and have become key hotspots for the proliferation of antibiotic resistance genes (ARGs). During the wastewater treatment process, bacterial inactivation may release ARGs into the environment, with two primary phases of presence: intracellular (iARGs) and extracellular (eARGs). The objective of this study was to assess the abundance and removal efficiency of ARGs during the WSP process, and to explore the correlation between ARGs, total bacterial populations, and integron 1 (intl1) as a marker for horizontal gene transfer. The results showed that raw wastewater had iARGs abundance ranging from 4.69×10^5 to 5.99×10^6 gene copies/ml, and eARGs from 5.91×10^3 to 1.04×10^5 gene copies/ml. After treatment through the WSP, intracellular ARGs, intl1, and 16S rRNA genes were reduced by 0.20 to 1.73 logs, while extracellular ARGs were removed by 0.05 to 0.79 logs. Interestingly, intl1 and 16S rRNA genes showed amplification at the outlet of the wastewater treatment plant by -0.21 and -0.87 logs, respectively. The study revealed that the relative abundance of ARGs was higher in the extracellular phase, with iARGs and eARGs showing values from 7.75×10^-5 to 4.52×10^-2 and 1.33×10^-4 to 1.58×10^-1, respectively. A significant positive correlation was observed between ARGs and the total bacterial population, as well as with intl1, indicating the potential for co-occurrence and horizontal gene transfer in the microbial community within wastewater. This research highlights the environmental implications of ARGs persistence and proliferation in wastewater treatment processes, offering insights into the management of ARGs in wastewater treatment systems.

Analisis Daur Hidup Proses Produksi Beton RCC dengan Substitusi Parsial Terak Nikel (Studi Kasus Laboratorium Struktur dan Material, Fakultas Teknik, Universitas Indonesia) Pratiwi, Siva Yuniar; Rahmatika, Iftita; Viandila Dahlan, Astryd; Sjah, Jessica; Handika, Nuraziz
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i6.60383

Concrete is the most widely used construction material in infrastructure development. The main components of concrete consist of coarse aggregate (gravel/split stone), fine aggregate (sand), cement and water. The massive use of natural aggregates raises concerns about their future availability. Nickel slag, which has similar chemical characteristics to natural aggregates, has the potential to be a sustainable substitution material. This study aims to analyze the environmental impact of the Roller Compacted Concrete (RCC) concrete production process with 50% nickel slag substitution for natural aggregates using the Life Cycle Assessment (LCA) approach. The approach used is gate to gate with units per 1 m3 of concrete and analyzed using OpenLCA software and the ReCiPe2016 method. The results of the analysis showed that the RCC concrete compaction stage produced household gas emissions of 1,030.42 kg CO2 eq for Scenario 1 and 1,108.27 kg CO2 eq and for Scenario 2. At the transportation stage, it is known that the largest emission results come from the delivery process of PT. Y to the Laboratory as far as 28 km, which is 1,521.18 kg CO2 eq. Based on these results, it is recommended that the selection of material providers consider comparable mileage to reduce the environmental impact of the transportation process.

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