Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Teknologi Indonesia
Dewi Nilawati, Dewi
Unknown Affiliation
Computer Science & IT

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Propionic Acid Metabolism During Anaerobic Biowaste Slurry Digestion Sembiring, Tarzan; Ekoputranto, Agung; Sriwuryandary, Lies; Nilawati, Dewi; Gallert, C; Winter, J
Teknologi Indonesia Vol 35, No 1 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i1.175

Abstract

Solid waste was found to be a problem in the city sanitary and river management in Indonesia. Bio-waste from traditional market, which is as the major part of the solid waste of the city, is one of the big problem in the sanitary management. To over come of the problem of the bio-waste, the experiment on the anaerobic biodegradation of organic waste slurry in stirred tank bioreactor was executed. The substrate was feeding into reactor and inoculated with an anaerobic enriched mixed culture originally from cow intestinal micro flora. The total solid of substrate was around 10 percent. During the batch experiment showed that the pH value relatively stable around pH 7 but the pH is decreased in the end of the experiment. The degradation of organic slurry is shown by the decreasing of COD content from around 90 g/l to 20 g/l and the formation of volatile fatty acids. Methane content of the biogas produce is more than 60 %. The volatile fatty acids detected are acetic acid, propionic acid, butyric acid and valeric acid. The fluctuation of volatile fatty acids formation and its depletions were relatively good as well as the depletion of Chemical Oxygen Demands, in which the pH value is around 7.5 Propionic acid and butyric acid degrading bacteria were also found in the consortium of mixed culture as indicated by the elimination of those volatile fatty acids during the experiment and in the enrichment cultures. Observation of the cultures of propionic acid degrading enrichment under the microscope shown that the morphology of the bacteria were rod with dimension of 0.81 ?m x 2-3 ?m ( d x l ) and the better gown in pH 6.57.
HUMAN EXCRETA DISCHARGING SYSTEM AND POTENTIAL NUTRIENT RECOVERY OF ECOLOGICAL SANITATION CONCEPT IS IMPLEMENTED IN SLUM AREA OF KIARACONDONG, BANDUNG Astuti, Jovita Tri; Nilawati, Dewi; Sintawardani, Neni; Ushijima, Ken
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.270

Abstract

This study was aimed to observe sanitation conditions of Kiaracondong and to estimate potential recovery of nutrient from human excreta. Interviews to 111 households covering of defecation frequency, toilet facilities, water sources and discharge systems were conducted through cooperation with the household association. Fresh faeces and urine samples were collected, weighed and characterized. Data of Kiaracondong population was required to calculate the nutrient recovery potential based on human excreta characteristics. The results showed that all public toilets in Kiaracondong, which were installed along the canals, have no water facilities and are in poor sanitation conditions. Wastewater from all public toilets and most private toilets were discharged directly to water bodies. Potential nutrients recovery from human excreta were 57.32, 2.79, 1.57, and 1.65kg.p -1 .y -1 , for OM, N, P, and K respectively. Meanwhile, total nutrient recovery in Kiaracondong was estimated to be 7,199; 350’ 197; and 207 tons.y -1 for OM, N, P, and K respectively. Worm ova was not detected in faeces and urine samples. However, bacteria E. coli and Enterobacter agglomerans and fungus Candida sp. were detected in faeces samples. Meanwhile, organisms in urine were E. coli, Enterobacter aglomerans, Serratia liquefaciens, Serratia marcescens and Staphylococcus saprophyticus. Implementation of composting toilet was expected could be appropriately way to solve the sanitation problems.
Co-Authors Ekoputranto, Agung Gallert, C Jovita Tri Astuti, Jovita Tri Neni Sintawardani Sembiring, Tarzan Sriwuryandary, Lies Ushijima, Ken Winter, J