Demes Nurmayanti
@poltekkesdepkes-sby.ac.id
RESEARCH, TEACHING, or OTHER INTERESTS
Environmental Science, Environmental Chemistry, Safety, Risk, Reliability and Quality, Waste Management and Disposal
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Demes Nurmayanti, Lailatul Fithriyah, Ngadino Ngadino, Irwan Sulistio, Slamet Wardoyo, Marlik Marlik, and Mahawiraja Setiawan
Fakultas Kesehatan Masyarakat Universitas Hasanuddin
Dengue fever is transmitted every year by the Aedes aegypti mosquitoes in Indonesia. One way to prevent this is by using repellents, such as the noni leaf extract (Morinda citrifolia L.). The objective of this study was to analyze the potential of the noni fruit (Morinda citrifolia L.) leaf extract as a repellent against Aedes aegypti. The study employed a post-test research design with only a control group, using concentrations of 12.5%, 25%, and 37.5%, and 25 mosquitoes with 6 repetitions. The technique for data collection involved counting mosquitoes that perched on hands. The study was conducted from November 2022 to May 2023. Data analysis was performed using SPSS Anova One Away Post Hoc and the power protection formula. The research on Aedes aegypti mosquitoes that perched for 6 hours showed that the noni leaf extract concentration of 37.5% had an average of 2.5 tails perched. The concentration of the noni leaf extract is 37.5%, according to the Pesticide Committee standard (1995). The average protection power for 6 hours is 90.86%. The study also suggests investigating the side effects of use and the addition of an HPMC gelling agent. However, for concentrations of 12.5% and 25%, the protective power is less than 90%. This study shows that concentrations of 37.5% are effective for repelling Aedes aegypti mosquitoes. Further research can be conducted using old or yellowed leaves, as well as for repelling culex and Anopheles mosquitoes.
Demes Nurmayanti, Hanifah Nailul Mukarromah, Marlik Marlik, and Ruslan La Ane
Fakultas Kesehatan Masyarakat Universitas Hasanuddin
For the last 3 years of dengue cases in Situbondo Regency, there were 475 patients recorded from January to December 2021 (incident rate, IR = 68.904/100,000) and 4 death cases (case fatality rate, CFR = 0.8%). The average percentage of Larvae Free Index Situbondo scores is still below the Environmental Health Quality Standards for an area of at least 95%. This study aims to describe the mapping of Larvae Free Index and dengue cases in Situbondo district in 2021. The type of this research is descriptive. The object of this research is the value of Larvae Free Index and cases of DHF. The data obtained is secondary data from Larvae Free Index and DHF cases in Situbondo Regency for 3 years starting from 2019-2021. The data is displayed using QGIS mapping using points and polygons. Health information and the potential for dengue fever in the area can be identified using geographic mapping, this information can be used to decide policies in breaking the chain of disease. The number of dengue cases in Situbondo Regency increased from 2019-2021. Larvae Free Index value of each village is better than the previous year. The spread of dengue cases is very high due to the mobility of residents who carry out activities outside the area of residence, resulting in transmission of dengue through mosquito bites. To prevent the spread of dengue cases, people are expected to use mosquito-repellent lotion when traveling.
- Suprijandan, Slamet Wardoyo, and Demes Nurmayanti
Informa UK Limited
Demes Nurmayanti, Alkausyari Aziz, and Khayan Khayan
Informa UK Limited
Iva Rustanti Eri, Namira Pramudinta, and Demes Nurmayanti
Wydawnictwo Naukowe Gabriel Borowski (WNGB)
Domestic wastewater, such as detergent wastewater, causes the increase of the phosphate level that strongly contributes to eutrophication. Adsorption is a method that can be used to reduce the levels of phosphate. The natural ingredients that can be made as activated carbon include edamame soybean peel, because it contains a lot of celluloses. This research aimed to analyze the adsorption kinetics and adsorption capacity of edamame soybean peel activated carbon in reducing the phosphate levels. Adsorption was carried out with batch method with various concentrations of adsorbate (2 mg/L, 4 mg/L, and 6 mg/L) and stirring time (3 hours, 6 hours, 9 hours, and 12 hours). The results showed that the highest adsorption capacity was found in 6 mg/L of adsorbate concentration and 6 hours of stirring time. The results were validated by the Langmuir isotherm and pseudo-second-order adsorption kinetics model. The Langmuir isotherm indicated that adsorption occurred in monolayer. The maximum adsorption capacity was 0.43509 mg/g and the constant of adsorption kinetics was 1.5558 g/mg·min. Activated carbon from edamame soybean peel successfully reduced the levels of phosphate. The increase of adsorption capacity was correlated with the increasing concentration of adsorbate and stirring time until the equilibrium.
Nur Rafiqa Puspita Sari, Iva Rustanti Eri, Demes Nurmayanti, Ferry Kriswandana, and Narwati Narwati
Institute of Advanced Engineering and Science
Clam shells are a food solid waste that increases and accumulates every day, causing environmental pollution. Clam shells (Anadora granosa) contain chitin. Chitin can be processed into chitosan, which effective in absorbing heavy metals. To increase absorption, chitosan modified into a membrane. The purpose of this study was to analyze the membrane's ability of chitosan waste from blood clam shells to reduce levels of iron in water. The design of this study was pure experimentation. The object of research used was iron-containing artificial water made from iron salt powder at a dose of 4.50 mg/L. Variations of Chitosan concentration to the membranes manufacture were 1%, 2%, 3%. Analysis of the data used was One Way Anova Test. Chitosan characterization analysis using XR Diffraction showed that chitosan was isolated from shells at peak angles at 17.99o and 34.04o. The highest percentage of iron reduction was given by membranes with a chitosan concentration of 3%, which have decreased of 94%. The results showed that the membrane of blood shells chitosan can reduce iron levels in water and can be an alternative material in the utilization of clamshell waste. The membrane can be applied in simple water treatment filtration systems in the community.
Marlik, Demes Nurmayanti, Ferry Kriswandana, and Heru Santoso Wahito Nugroho
Diva Enterprises Private Limited
Recently, the distance of wastewater infiltration from septic tank and clean water source is not suitable because developers build houses with narrow land area so that the house price is affordable. This research aimed at analyzing faeces waste treatment design in household with narrow land area, using experimental design. The variables were Coliform bacteria and turbidity of wastewater that passed the treatment design in the distance of 0, 5, 7, 9, 11, and 13 meters. The obtained data was analyzed using Anova. Domestic wastewater treatment design with narrow land area needed at least 3 m2. It could reduce Coliform bacteria until 13 meters in 74 colony/100 ml, meanwhile, the turbidity in the distance of 0 meter was qualified into the determined requirement with the average of 19.49 NTU. It could reduce either Coliform bacteria or turbidity significantly in every distance and in the distance of 13 meters, the percentage of decrease was 88.42% for Coliform bacteria, meanwhile, 98.14% was for turbidity.