bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nitrate concentration and accumulation on vegetables related to altitude and sunlight intensity
Authors: Agusta H , Kartika J G , Sari K R 
Published: November 2021

Abstract
Nitrate absorption and concentration in consumed vegetables should be also interrelated with its quality, where it is now less noticed in standard vegetable quality. The higher nitrate content is associated with the human health impact such as the baby blue syndrome and stimulating the tumor growth. The environmental status on especially sunlight intensity and quality has a special role to control nitrate concentration in the leaves. The purpose of this study was to characterize the nitrate concentration and accumulation in Brassica rapa L. grown in an open field and screen shading at lower and medium altitudes. Plant sampling was arranged at lower altitudes under 500 m asl (meters above sea level) and medium altitudes 500-700 m asl. Plant growth under shading and unshaded condition were observed for nitrate status as absorbed and its concentration in the sap plants. The study site at the lower altitude exposed sunlight intensity by 27.2% higher, where it decreased nitrate accumulation by 39.3%. Nitrate accumulation under shaded condition rate of 54.9% exhibited more 17.7% nitrate concentration in the vegetable.
Urban river water quality improvement in Bandung City, Indonesia
Authors: Yustiani Y M , Alfiah T 
Published: November 2021

AbstractBandung City is one of the big cities in Indonesia with a relatively poor river water quality. Several improvement efforts have been made, especially by the government. This study aims to review these improvement efforts and the results obtained. The rivers that are the leading review are the Cikapundung River, Citepus River, Cicadas River, and Cipamokolan River. The data was obtained from the monitoring results conducted by the government environmental service bureau of Bandung and the Province of West Java. Based on the study results, it was found that there was an improvement in the water quality of the Citepus River, but this river had a non-biodegradation capacity in 2020. The high TSS, COD, BOD, and MBAS detergents indicate the dominating domestic activity in urban watersheds. The most significant control effort to improve the quality of river water in the city of Bandung is the availability of waste treatment at the source, both household and regional scale. Onsite efforts to improve river water quality also have a positive impact, i.e., applying an eco-enzyme solution and developing structures in the river for the aeration process.
The potential and prospect of biomass as primary energy in Indonesia
Authors: Lantasi A I D , Syafrudin  , Budiyono  
Published: November 2021

Abstract
Energy is one of the needs to support daily human activities. Without energy, various activities such as industry, health, and household will be disrupted. Total energy consumption in Indonesia in 2018 reached 875 million barrels of oil equivalent (BOE), which was dominated by fuel oil. It illustrates that national energy consumption is still dominated by primary energy sources originating from fossil fuels. Various previous studies have suggested the environmental and health impacts of air pollution from burning fossil fuels. This article will briefly discuss biomass as a primary energy source based on the results of literature studies. The discussion section will discuss the environmental impacts of biomass utilization based on several scientific studies and the form of biomass utilization in Indonesia that has been carried out. As a follow-up to several scientific facts, it is necessary to mix other primary energy from new and renewable energy sources.
The cellulose of Boehmeria nivea as natural flocculants: synthesis, modification, and flocculation analysis
Authors: Fauzani D , Notodarmojo S , Handajani M , Helmy Q , Kardiansyah T 
Published: November 2021

Abstract
Due to their non-toxicity and biodegradability, natural polymeric flocculants have gained popularity in water and wastewater treatment in recent years. Because of its broad availability, renewability, sustainability, and surface modification potential, cellulose, the most common polymer on the planet, is regarded as one of the foundation polymers for flocculant production and modification. The following article consists of a review of the latest developments regarding biopolymers, in particular, cellulose as a natural flocculant. One of the plants that can be developed in Indonesia is Boehmeria nivea, or what is known as Ramie, which contains cellulose that is still not utilized optimally. There is a method of isolation of alpha-cellulose derived from Boehmeria nivea and its application as a flocculant in synthetic wastewater presented in this paper. The alpha-cellulose of Boehmeria nivea was used as a flocculant in jar testing using kaolin suspension (5 g/L). The study shows that adding alpha-cellulose as an aid to PAC slightly increased the turbidity removal efficiency, and further modification of alpha-cellulose by cationic grafts into cationic cellulose is needed.
Spatial distribution change of groundwater quality in deep aquifer of Semarang alluvial plains area in past five years
Authors: Susanto  , Syafrudin  , Putranto T T 
Published: November 2021

AbstractOver time, excessive groundwater usage in urban areas can affect groundwater conditions both in quantity & quality. In some regions, groundwater in the unconfined aquifer has been heavily involved, but for confined aquifers that are deep & tend to be protected, they are not involved too much. The extensive effect, especially groundwater quality, is very significant, especially in coastal areas where seawater intrusion is common & changes in water salinity occur within a specific time range. Regarding these conditions, research was carried out related to changes in spatial & temporal distribution patterns of groundwater quality, exceedingly physical & chemical parameters related to salinity in confined aquifer conditions in coastal areas. By taking a case study in the alluvial plains of Semarang City, this study aims to determine whether there are significant changes in the five years, starting from 2016 to 2020. By using data sourced from groundwater quality tests taken in the reference year, the results gained from the data processing explained that the groundwater quality parameters such as electrical conductivity, total dissolved solids (TDS), acidity (pH), & chloride ions (Cl-) are changing respectively, both spatially & temporally.
Analysis of waste composition as a source of refuse-derived fuel in Cilacap
Authors: Mustia D I , Edy S , Nurul A 
Published: November 2021

Abstract
The government focuses on converting garbage into energy, such as in Cilacap, that waste is processed into Refuse Derived Fuel (RDF). Compared to organic waste, a material with high calorific value fractions such as plastic is a potential energy source. Of contrast, organic waste dominates the waste composition in Indonesia. This study aimed to look into the waste composition in Cilacap as a resource of RDF. This is descriptive research that uses quantitative approaches. Organic waste dominated composition by 53,14%, according to a survey of 100 respondents. The percentages of plastic waste, paper, textile, and rubber/leather are 28,46%; 16,09%; 0,8%; and 0,42%; respectively. People who generate more organic waste are more likely to engage in social activities, have no yards and have no livestock. Furthermore, buying too much food and regularly leaving meals on the table may increase organic waste production. The calorific value obtained from the data is 3.735 kcal/kg. Knowing the theoretical calorific value of waste composition in Regency gives an overview of economic potential and research into appropriate policy recommendations for the government.
Technical evaluation of ultrafiltration unit in Siwalanpaji’s water treatment plant, PDAM Sidoarjo
Authors: Rachmawati F , Marsono B D , Masduqi A , Purnomo A 
Published: November 2021

Abstract
Raw water with high turbidity requires pretreatment on its ultrafiltration unit to prevent fouling. Based on that, it is necessary to evaluate the ultrafiltration unit’s quality, quantity, and operation in Siwalanpanji’s WTP. The evaluation method compares the design criteria, technical specification, and ultrafiltration with the conventional to see the existing condition. The results of ultrafiltration turbidity and organic substance efficiency removal are about 53% and 18%, it’s not more good than conventional unit efficiency removal, which has 89% for turbidities removal and 37% for organic substance removal. Moreover, the quality of the production water fulfils the standards of Indonesia Health Minister No. 492 of 2010, except for the value of organic substances, which is in this analysis it around 13.69 mg/L meanwhile, in standard, it must not be more than 10 mg/L. Evaluation of the operating performance of each treatment unit related to the membrane unit at the WTP in Siwalanpanji has fulfilled the criteria design. However, using an ultrafiltration unit results in treated water quality is equivalent to a conventional treatment unit. So from this evaluation, it is found that there is a need for recommendations pretreatment, which is better for raw water to treat before ultrafiltration.
Performance evaluation of waste management in MRF-3R (case study Sukoharjo District)
Authors: Wangi L S , Sumiyati S , Sarminingsih A 
Published: November 2021

Abstract
Independent waste management system based on the community with the implementation of Material Recovery Facilities with reduce, reuse, recycle principles (MRF 3R) has been widely applied in various places, including Sukoharjo District. Based on data from DLH Sukoharjo District, currently in Sukoharjo District there are 6 MRF-3R. The current condition of MRF-3R still cannot be monitored optimally, so the performance of each MRF-3R is not yet known. This study aims to evaluate the performance of waste management in MRF-3R by taking a case study in Sukoharjo District. This research was conducted based on the 2017 MRF-3R Technical Guidelines. This study will evaluate aspects of supporting regulatory products and technical technology. Based on evaluation results of supporting regulatory product aspects, the final value for 5 MRF-3R can be categorized as medium. Meanwhile, evaluation results of technical and technology aspects of each MRF-3R have a different categorization result. Following are the technical and technology evaluation results from each MRF-3R, MRF-3R Gonilan is categorized as a medium, MRF-3R Gumpang is categorized as not good, MRF-3R Ngabeyan is categorized as good, MRF-3R Kwarasan is categorized as not good, and MRF-3R Sanggrahan is categorized as medium.
Dynamic model of municipal solid waste management from households in Sukuta Nema, The Gambia
Authors: Jassey B , Zaman B , Syafrudin  
Published: November 2021

Abstract
Improper waste management is a global concern, especially in developing countries where population growth is increasing. Improper waste management is increasingly becoming a global problem that requires a holistic approach to avert health consequences. This research aims to estimate the generation, reduction and disposal of solid waste from households in Sukuta Nema, The Gambia, in the next 25 years. An analytic observation with a cross-sectional design and a dynamic model approach and data from observations in the field were used—a sample size of 125 households was drawn using random sampling. The results showed that household waste generation in Sukuta Nema was 2.07 kg/house/day or 0.0083 m3/house/day. Household waste from Sukuta Nema is predominantly organic, with a proportion of 80.71%. Inorganic waste constitutes about 19.29%. Based on the model scenario for 25 years (2021-2046), the results show that the estimated average rate of waste reduction through waste banks is 5.84%, the rate of waste reduction through composting scenarios is 64.20%, and the rate of waste reduction through a combined scenario between a waste bank and composting is 70.04%. The best waste management tool to use ineffective waste reduction is the combination scenario.
Evaluation of river water quality by using hierarchical clustering analysis
Authors: Warsito B , Sumiyati S , Yasin H , Faridah H 
Published: November 2021

Abstract
Assessment of water pollution is a critical study because it can affect humans directly. Likewise, river water is widely used for various daily needs. It is important to group rivers according to their classes so that further analysis and action can be carried out. This article discusses the clustering of rivers in several areas in the southeast part of Central Java Province consisting of 14 sampling stations based on several water quality parameters. The pollutant parameters include TSS, electrical conductivity, pH, BOD, COD, and DO. The method used is Hierarchical clustering in which the object grouping begins with grouping two objects with the closest distance being combined into one cluster, and then continues until one cluster is formed consisting of all objects. The results show that five clusters are the ideal choice. Except for electrical conductivity, the parameters observed are dominantly the difference between clusters. Through the formation of river clusters based on their water quality, the characteristics of each cluster and cluster members with high similarity can be identified.
Brackish water treatment for small community by using membrane technology
Authors: Auliya V R , Marsono B D , Yuniarto A , Nurhayati E 
Published: November 2021

Abstract
High salinity water, containing high TDS and chloride, is a common problem in coastal areas of Indonesia. The chloride content in water causes water to taste salty. It occurs in a small community of Tambak Cemandi Village, Sidoarjo. The groundwater has chloride content up to 3,694.3 mg/L, hardness 2,071 mg/L (CaCO3), and total coliform 7,100 MPN/100 mL. Membrane technology has been overgrowing all over the world in the water desalination process. This study aims to examine the basic concepts, principles, advantages, and disadvantages of membrane technology and its application in brackish water treatment for drinking purposes. This research was conducted by literature review, secondary data analysis, and application of case studies. The case study is applied to small scale drinking water treatment (flow rate 0.2 L/second) with brackish raw water from groundwater in Tambak Cemandi Village, where some of the population do not have access to safe drinking water. The study concludes that RO membranes with UF pre-treatment are adequate to treat 98%, 96%, and 100% of chloride content, hardness, and total coliform and fulfilled Indonesia Ministry regulation’s drinking water quality standard. The treatment can serve 202 people with an operational cost of Rp. 1,198/people.day.
Comparative study on thermal comfort responses and sleep quality between Indonesian and Japanese students during summer in Japan
Authors: Budiawan W , Tsuzuki K , Sakakibara H 
Published: November 2021

Abstract
The comfort temperature and sleep quality of Indonesian residing in Japan during summer might be different from Japanese. As an extended previous research, this study aimed to compare the thermal comfort and sleep quality between Japanese and Indonesian students. Male Indonesian and Japanese students aged 20-35 years participated in this study. The participants completed a survey regarding thermal sensation before sleep. During sleep, actigraphy was used to monitor sleep. Additionally, the temperature and relative humidity of the participants’ bedrooms were recorded. The findings of this study indicated that Indonesian students’ bedroom temperature and relative humidity were not significantly different from those of Japanese students during the summer. Most of Indonesian students preferred neutral, like the Japanese students. According to a thermal comfort survey, Indonesians had the same sensation as Japanese (slightly comfortable). However, the Griffiths method revealed that the mean comfort temperature of Indonesian was higher than those of Japanese students. We also discovered that Indonesian students had shorter duration on bed and sleep minute than Japanese students. Furthermore, the sleep rate of Indonesian students was comparable to that of Japanese students. In conclusion, Indonesian students as tropical native became capable of adjusting to the hot and humid conditions in temperate climate, Japan.
Removal of cyanide from alumina smelter wastewater using precipitation and filtration technique
Authors: Huda M F , Helmy Q 
Published: November 2021

Abstract
Aluminum is a metal that is used in many products because of its good conducting properties. However, in the production process, aluminum is not obtained easily but through a long process. In aluminum smelting process, wastewater that is produced indicates the existence of pollutants as determined by several indicators of water pollution, one of which is cyanide that will threaten human and environmental health if not treated properly. This study was conducted to determine the optimal dose of ferrous sulfate to remove cyanide, the precipitation and filtration process efficiency in reducing cyanide, and its effect on pH of wastewater. Data were collected from an aluminum smelting company, and experiments were conducted in the laboratory. Based on results, ferrous sulfate dose of 93 mg/l is the most optimal dose in removing cyanide with an efficiency of 58.74±0.51%, while filtration process provides an efficiency of 81.65±0.42%. Precipitation with ferrous sulfate makes pH value of wastewater decrease, but filtration process increases the value again. Throughout the whole process, cyanide can be reduced by a combination of precipitation and filtration process with the efficiency of 92.43±0.26% and an average final effluent concentration of 0.78 mg/L from an initial concentration of 10.3 mg/L.
Treatment of textile industry wastewater by electrocoagulation technology
Authors: Rezagama A , Handayani D S , Rahardjo B A , Ashifa S , Wafa M Y 
Published: November 2021

Abstract
Experiments were carried out by treating the waste samples with electrocoagulation technology. This is done to determine the effectiveness of the removal of the electrocoagulation device against textile waste. The sample used is a synthetic sample with a concentration of 1091 mg/L Pt-Co units. The research was conducted twice with the first experiment being conducted to determine the most effective electrical voltage to remove the existing COD and color pollutants while the second experiment was conducted to determine the type of anode and cathode that was most effective in removing COD, Color, and heavy metal pollutants. In the first experiment, it was found that the electric voltage that could produce the best removal was 4 amperes and in the second experiment, the anode-cathode type with the highest % removal was Fe-Fe with % COD removal of 64.09639% and % color removal of 60.00619%. It was concluded that electrocoagulation method could effectively remove color and COD in waste water.
Characteristic differences between breeding places with and without Culex sp. larvae on lymphatic filariasis patient surroundings in an endemic area
Authors: Siwiendrayanti A , Anggroro S , Nurjazuli  
Published: November 2021

Abstract
Brebes Regency is one of the Lymphatic Filariasis (LF) endemic areas in Central Java Province, Indonesia. Ketanggungan Subdistrict, Bantarkawung Subdistrict and Paguyangan Subdistrict have the highest case numbers. Culex sp. is one of the vectors of LF in Java, Indonesia. This study was conducted to obtain information about the characteristics of the breeding places for Culex sp. in the area where people with LF live. The finding could be used as information with facts for society. It was a descriptive quantitative study with an observational design. The observation was conducted in a radius of 200 meters around the settlements of LF (15 patients) in three sub-districts in the Brebes Regency. Observed and measured data were larval density, water acidity, air temperature, air humidity, water flow, prominent flora presence, and prominent fauna presence. The breeding places observed were puddles, rivers, and sewers. Puddles and sewers with no aquatic animals were observed positively for the presence of Culex sp. larvae. The most preferred breeding place for Culex sp. in the study area were uncovered sewers.
The impacts of economic freedom on the environment: The case of carbon dioxide emissions in seven ASEAN countries
Authors: Setyadharma A , Nikensari S I , Oktavilia S , Wahyuningrum I F S 
Published: November 2021

Abstract
Global warming has been acknowledged as one of the main environmental issues, and economic freedom as one of the institutional factors is believed to be the key to protecting the environment. This study evaluates the proposition that countries with higher economic freedom will have a better environment than countries with a dictatorship government. This study uses panel data regression data from 2011 to 2017 and consists of seven ASEAN Countries. This study constructs an econometrics model with three main variables, i.e., economic freedom, Information, and Communication Technology (ICT), and real gross domestic products (GRDP) that have an impact on carbon dioxide (CO2) emissions. The main results show that (1) higher economic freedom leads to low CO2 emissions. (2) better Information and Communication Technology reduces the level of CO2 emissions. And (3) Positive economic growth influence a higher level of CO2 emissions. The policy implication implies that the governments in seven ASEAN countries should support more economic freedom to support a better environment, use efficient ITC that leads to the protection of the environment. Apply the environmental statistics into the calculation of GRDP to improve countries’ capacities to manage their economies and natural resources.
Effects of various diluents on the quality and shelf life of Donggala bull semen
Authors: Mirajuddin  , Duma Y , Mumu M I , Ladjama M R , A’fia Nur , Abas A M , Ringgiallo A 
Published: November 2021

Abstract
This study aimed to determine the effects of different semen diluent on the quality and storage time of liquid semen of Donggala bull. Semen was obtained from four selected bulls which collected using artificial vagina. The semen diluent is based on Tris aminomethane-citric acid with different concentration of glucose namely P1=0.00g, P2=0.25g, P3=0.50g, and P4=0.75g. Another group of treatment also prepared based on Tris aminomethane-glucose with different concentration of egg yolk namely P5=0%, P6=15%, P7=20%, and P8=25%. The data obtained were then analyzed descriptively. Results showed tris aminomethane-citric acid-glucose diluents had sperm progressive motile at >40% until the day 4 of storage, and tris aminomethane-glucose-egg yolk only able to support sperm life for 2 days, and in P8 group shows 41.02% motile on the day 3. In this study, we found the pattern of the increasing of shelf life affect to the decrease rate of sperm viability and normality.