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All Journal JURNAL AIR INDONESIA Narra J
Priadi, Cindy R.
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Health Professions Immunology & microbiology Medicine & Pharmacology Public Health

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PENGOLAHAN AIR LIMBAH DOMESTIK DENGAN ANOKSIK-AEROBIK MOVING BED BIOFILM REACTOR (STUDI KASUS: PENYISIHAN AMONIA DAN KARBON DALAM AIR LIMBAH DOMESTIK) Ningtias, Berliana C.; Moersidik, Setyo S.; Priadi, Cindy R.; Said, Nusa Idaman
Jurnal Air Indonesia Vol. 8 No. 2 (2015): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (465.115 KB) | DOI: 10.29122/jai.v8i2.2377

Abstract

Domestic wastewater contains high organic carbon and ammonium concentration which can be treated by moving bed biofilm process. It is a biologycal hybrid between attached and suspended growth process. The purposes of this research were to determine the removal percentage of organic carbon and ammonium concentration in domestic wastewater, and to investigate optimum hydraulic residence time. Experiment was carried out in a laboratory scale to study the combine anoxic and an aerobic reactor condition. The treatment process is preceeded by a 4-week seeding process continued with variation of hydraulic residence time. Based on these results, the removal percentage of COD for each hydraulic residence time of 12, 16, and 20 hours were 75,7%; 83,7%; and 91,0%, the removal percentage of ammonium were 79,4%; 91,0%; and 92,3%. The optimum hydraulic residence time in removing organic carbon and ammonium concentration domestic wastewater using anoxic aerobic MBB is 20 hours. This biological hybrid treatment can be an alternative to remove organic carbon and ammonium in domestic wastewater. Keyword: domestic wastewater, ammonium removal, organic carbon removal, moving bed biofilm reactor
PENGOLAHAN AIR LIMBAH DOMESTIK DENGAN ANOKSIK-AEROBIK MOVING BED BIOFILM REACTOR (STUDI KASUS: PENYISIHAN AMONIA DAN KARBON DALAM AIR LIMBAH DOMESTIK) Ningtias, Berliana C.; Moersidik, Setyo S.; Priadi, Cindy R.; Said, Nusa Idaman
Jurnal Air Indonesia Vol. 8 No. 2 (2015): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v8i2.2377

Abstract

Domestic wastewater contains high organic carbon and ammonium concentration which can be treated by moving bed biofilm process. It is a biologycal hybrid between attached and suspended growth process. The purposes of this research were to determine the removal percentage of organic carbon and ammonium concentration in domestic wastewater, and to investigate optimum hydraulic residence time. Experiment was carried out in a laboratory scale to study the combine anoxic and an aerobic reactor condition. The treatment process is preceeded by a 4-week seeding process continued with variation of hydraulic residence time. Based on these results, the removal percentage of COD for each hydraulic residence time of 12, 16, and 20 hours were 75,7%; 83,7%; and 91,0%, the removal percentage of ammonium were 79,4%; 91,0%; and 92,3%. The optimum hydraulic residence time in removing organic carbon and ammonium concentration domestic wastewater using anoxic aerobic MBB is 20 hours. This biological hybrid treatment can be an alternative to remove organic carbon and ammonium in domestic wastewater. Keyword: domestic wastewater, ammonium removal, organic carbon removal, moving bed biofilm reactor
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

Abstract

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.
Co-Authors . Andriansjah Ningtias, Berliana C. Nusa Idaman Said Paramitadevi, Yudith V. Rahmatika, Iftita Setyo S. Moersidik