bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of leachate recirculation and bulking agent on leachate quality
Authors: Oktiawan W , Priyambada I B , Purwono P 
Published: November 2021

Abstract
The purpose of leachate processing is to reduce pollutants in leachate without using equipment that requires high investment and complicated maintenance. This research aims to determine the impact of leachate recirculation and bulking agents on leachate quality. Fresh solid waste recirculated using artificial leachate with a continuous flow of 1 L/h. The study is conducting for 14 days on a laboratory scale. On the 14th day, combination recirculation and bulking accelerate the increased pH value. Leachate recirculation increases the potential for contact between methanogenic bacteria and dissolved organic matter and contributes to buffering pH during the hydrolysis process. R3 produces a higher Electric Conductivity (EC) value than other reactors since the 7th day. This increase is probably due to the addition of dissolved salts from solid waste decomposition. The role of the bulking agent may not be too significant for changes in the EC value. On day 14, TDS at R1 was 11,748 mg/L, R2 was 12.144 mg/L, and R3 was 14.916 mg/L.
Effect of electrode configuration and voltage variations on electrocoagulation process in phosphate removal of laundry wastewater
Authors: Samadikun B P , Oktiawan W , Junaidi  , Rais A K , Taqiyya T A , Amrullah M R , Basyar C 
Published: November 2021

Abstract
Indonesia is one of the countries that still have to deal with waste problems. In reducing waste, the government has made a series of efforts to reduce waste, especially wastewater. There are many kinds of wastewater. One of them is laundry wastewater. This research aims to estimate the dangerous substance in laundry wastewater and how to treat it. The method using some variables like Al-Al, Al-Fe, Fe-Fe, and Fe-Al and the voltage is changing from 20 V, 30 V, 40 V, and 60 V. The research shows that the most optimum result of laundry wastewater treatment was using Al-Fe electrode plate 60 V. The result that the phosphate concentration decreased by 6.56 mg/l from 9.58 mg/l to 3.01 mg/l and obtained phosphate removal efficiency of 68.56%. The most optimum results for the removal of phosphate levels contained in the 60 V voltage.
The effect of time and velocity variation in sequencing batches reactor on TSS and nitrogen removal in tofu waste
Authors: Sudarno S , Hardyanti N , Zaman B , Arihta A , Putri R 
Published: November 2021

Abstract
The tofu industry is one of the home industries which in the processing process, produces liquid waste. Tofu liquid waste is known to contain very high organic matter such as Nitrogen and TSS so that if it is directly discharged into water bodies, if discharged directly into the environment will cause water. The purpose of this study was to determine and analyse the effect of variations in times and velocity of sequence batch reactor on the optimization of Nitrogen and TSS removal in tofu industrial wastewater by anaerobic bacteria originating from natural sediments. This study uses a Sequencing Batch Reactor, and the waste used is artificial by the characteristics in the preliminary test. In this study, time and speed variations were used in the mixing process. The artificial waste has a TSS value of 2,910 mg/l and Nitrogen of 18.82 mg/l. The results show that using a sequence batch reactor can reduce the TSS value to 66 mg/l and reduce the nitrogen value to 1.214 mg/l.
A review on a machine learning approach of an intelligent irrigation monitoring system with edge computing and the internet of things
Authors: Loua L R , Budihardjo M A , Sudarno S 
Published: November 2021

Abstract
Water consumption during irrigation has been a much-researched area in agricultural activities, and due to the frugal nature of different practiced irrigation systems, quite a sufficient amount of water is wasted. As a result, intelligent systems have been designed to integrate water-saving techniques and climatic data collection to improve irrigation. An innovative decision-making system was developed that used Ontology to make 50% of the decision while sensor values make the remaining 50%. Collectively, the system bases its decision on a KNN machine learning algorithm for irrigation scheduling. It also uses two different database servers, an edge and an IoT server, along with a GSM module to reduce the burden of the data transmission while also reducing the latency rate. With this method, the sensors could trace and analyze the data within the network using the edge server before transferring it to the IoT server for future watering requirements. The water-saving technique ensured that the crops obtained the required amount of water to ensure crop growth and prevent the soil from reaching its wilting point. Furthermore, the reduced irrigation water also limits the potential runoff events. The results were displayed using an android application.
Potential of local plant Eleocharis dulcis for wastewater treatment in constructed wetlands system: review
Authors: Santosa L F , Sudarno  , Zaman B 
Published: November 2021

Abstract
Plants have a vital role in constructed wetlands because they provide oxygen in removing pollutants, as a medium of microorganisms, as absorbers of nutrients and other pollutants, must be resistant to high levels of pollutant loads and stressful conditions. Several plants have potential for constructed wetland, namely Phragmites sp., Typha sp., Canna indica, Colocasia esculenta, Eichornia crassipes, Eleocharis dulcis, and others. Eleocharis dulcis is a local plant commonly found in South Kalimantan. Eleocharis dulcis in the local, namely Purun tikus, grows in tidal swamps and grows in areas of high soil acidity (pH 2.5 – 3.5). Eleocharis dulcis can be used in tackling reclamation waste of acid sulfate soil which can absorb 1.45% of N elements; Cu 15 ppm; P 0.08%; Zn 48 ppm; Mg 0.16%; Fe 1.386 ppm; S 0.18%; Mn 923 ppm; K 2.05%; and Ca 0.22%. According to several studies that have been carried out, Eleocharis dulcis have been shown to reduce several pollutant loads such as Hg 99.84%; Pb; Cd; Fe 85.68%; SO4; Mn 78.94%; BOD 98.74%; COD 98.73%; and turbidity 80% also. The local plant Eleocharis dulcis can be potentially used as wastewater treatment, especially in a constructed wetland systems.
The effect of land subsidence on the selection of raw water sources in hotel and apartment buildings in Semarang city
Authors: Syahputra B , Kiono B F T , Sudarno  
Published: November 2021

Abstract
The Semarang City Government prohibits groundwater/deep wells in hotel and apartment buildings because the use of groundwater or deep wells in locations that have experienced subsidence will further aggravate the subsidence. The method used in this research is to purposively select hotel and apartment buildings in Semarang that have received an assessment by the Semarang City Building Expert Team and have received a certificate of serviceability. Furthermore, compare the map of land subsidence in some areas of the city of Semarang with the natural water sources used by the hotel and apartment buildings. The research results showed that from 10 hotel and apartment buildings, there were 7 that used deep wells in zone level II, namely subsidence between 2.1 to 4 cm/year. Meanwhile, 3 other hotel and apartment buildings use water from the Municipal Drinking Water Company of Semarang. The existence of hotel and apartment buildings that use groundwater/deep wells in zone level II will increase and trigger the more significant subsidence in the area, thereby increasing the level of subsidence to level III.
Risk analysis-based reliability assessment approach under epistemic uncertainty using a dynamic evidential network
Authors: Bougofa M , Bouafia A , Baziz A , Aberkane S , Kharzi R , Bellaouar A 
Published: November 2021

Abstract
Probabilistic modeling is widely used in industrial practices, particularly for assessing complex systems’ safety, risk analysis, and reliability. Conventional risk analysis methodologies generally have a limited ability to deal with dependence, failure behavior, and epistemic uncertainty such as parameter uncertainty. This work proposes a risk-based reliability assessment approach using a dynamic evidential network (DEN). The proposed model integrates Dempster-Shafer theory (DST) for describing parameter uncertainty with a dynamic Bayesian network (DBN) for dependency representation and multi-state system reliability. This approach treats uncertainty propagation across conditional belief mass tables (CBMT). According to the results acquired in an interval, it is possible to analyze the risk like interval theory, and ignoring this uncertainty may lead to prejudiced results. The epistemic uncertainty should be adequately defined before performing the risk analysis. A case study of a level control system is used to highlight the methodology’s ability to capture dynamic changes in the process, uncertainty modeling, and sensitivity analysis that can serve decision making.
Renewable energy policy and governance in West Sumatera Province: an overview
Authors: Fajri H , Akmal A D , Saputra B , Ilham Q P , Wahyuni N 
Published: November 2021

Abstract
West Sumatera Province is the province with the highest renewable energy mix target in Indonesia. To realize this target, the Province of West Sumatera has designed a policy and institutional or governance strategy. Therefore, the purpose of this paper is to see the policies and forms of governance in the development of renewable energy in West Sumatera Province descriptively. The research was conducted in a descriptive qualitative way using 2 (two) data collection techniques: Interview and Documentation Review. Policy planning that targets 1) Formulation of the legal basis for development and utilization; 2) Development of utilization areas in the form of power plants (solar cell, garbage, wind, biomass, micro-hydro, mini-hydro, water, geothermal); and 3) Empowerment of local communities to support the success of energy sustainability in renewable energy installations. However, the wide-scale of energy development requires institutional forms that involve multi-stakeholders: government bodies and non-government bodies. However, unfortunately, in its implementation, the involvement of these stakeholders in an ideal collaboration forum never happened. Stakeholder involvement is limited to official formalities. We have again found the “magical word”: the tasks, principals, and functions that hinder the movement of the bureaucracy in Indonesia.
Agree or disagree: local youth’s perception of renewable energy development
Authors: Saputra B , Fajri H , Akmal A D , Wahyuni N , Halawa H S 
Published: November 2021

Abstract
This article aims to determine the perception of local youth in renewable energy policy and governance in West Sumatra Province. The local youth we mean in this study are university students. Our previous research shows an educated and critical community group conveying their aspirations and network to form coalitions. They played an essential role in rejecting the construction of renewable energy-based power plants in West Sumatra Province. This study uses a quantitative descriptive method supported by a survey to get local youth perceptions about renewable energy development in West Sumatra Province. Our survey was conducted online and got 346 respondents. The study results show that local youth do not fully understand renewable energy and the potential in West Sumatra Province. However, they relatively agree with renewable energy development even though they are less aware of developing and managing renewable energy policies. From the government side, they consider that the most qualified government is the one whose central role is the state, hoping that people can feel the benefits of renewable energy.
Optimization of water treatment process performance of Duren Seribu Water Treatment Plant in Depok City: water quality and design parameters
Authors: Hanifa R , Adityosulindro S , Wahyuningsih N P S 
Published: November 2021

Abstract
Duren Seribu Water Treatment Plant (WTP) plays a role in fulfilling water needs due to the increase in population growth. This study aims to evaluate the performance of the WTP and the potential for capacity uprating from the aspect of conformity to water quality standards, removal efficiency, and design parameters. Data collection was carried out by observation, measurement, and sampling. The result showed that raw water quality complies with the quality standards and is influenced by seasons. Meanwhile, the quality of drinking water produced for the parameters of pH, turbidity, TDS, organic matter, iron, and total coliform has complied with the quality standards. The efficiency removal of turbidity, TDS, organic matter, and iron occurred in conventional processing units were 94.6%, 70.5%, and 90.9%, and the total coliform removal efficiency was 1.8-log (67.05%). Based on the assessment of the design criteria, there are design parameters of the unit that require technical improvement such as detention time of flocculation unit, velocity and detention time in tube settler sedimentation unit, and the capacity of Duren Seribu WTP could be increased by 10% or up to 110 liters/second.
Rainwater harvesting as an alternative of freshwater supply in Balikpapan city – a case study of Institut Teknologi Kalimantan
Authors: Mamangkey E T , Sukmara R B , Ariyaningsih  
Published: November 2021

AbstractCurrently, 73% of the water demand in Balikpapan was only supplied from Manggar Reservoir, and it will continue decreasing parallelly with the increasing population. Regarding the population issues and the government’s planning for the new capital city of Indonesia, Balikpapan will be a buffer city facing serious risk in water supply issues in the future. Therefore, this study seeks to analyze an alternative of water supply. Following the concepts in Water Sensitive Urban Design (WSUD), The rainwater harvesting (RWH) method was chosen for preventive analysis, and Institut Teknologi Kalimantan (ITK) as one of the reputable’s universities in Balikpapan will be taken as a study location. The results obtained that the monthly water demand in ITK was ranged from 3228.34 m3to 16632.97 m3. Using RWH, water supply analysis was obtained from 3790.62 m3to 10697.31 m3in various rainfall durations (0.5 to 2 hours) and 20 years projections (2022 to 2042). Following the obtained water supply. This study also reveals that the savings of total water usage can be reached from 24% to 100%, and around IDR 14,082,002 to IDR 37,035,390 is converted to currency. The highest saving reached due to water supply meets the water demand.
Biosurfactant and chemical surfactant effectiveness test for oil spills treatment in a saline environment
Authors: Leslie M , Kardena E , Helmy Q 
Published: November 2021

Abstract
Toxic and persistent nature of hydrocarbon and its products make it a significant concern for treating oil spills. In addition, hydrocarbons such as crude oil have long and complex carbon chains, making them challenging to remove directly. Emergency response for oil spills generally conducted by spraying dispersant agent into spillage surface. However, the use of chemical dispersants is reported to have a negative impact on the environment. Therefore, an environmentally friendly method for treating oil spills, utilizing biological agents such as biosurfactant or bioemulsifier, is needed. This research focuses on performance tests of more environmentally friendly surfactants as substitute for chemical surfactant which causes toxic effect when used. Surfactant performance was evaluated through three indicators: emulsifying index, dispersion effectiveness, and germination index (G.I.). Performance test was carried out for three types of surfactants: sophorolipid biosurfactant, methyl ester sulfonate (MES), and tween-80. Dispersion effectiveness test showed sophorolipid, MES, and tween-80 enhanced hydrocarbons dispersion in saline water up to 26.59, 38.65, and 48.19%, respectively. Germination index test showed the average G.I. for oil dispersed by sophorolipid, MES, and tween-80 are 153.16%, 143.94%, and 6.69 %, respectively. Research result suggests sophorolipid and MES have the properties to enhance oil dispersion under-examined laboratory conditions.
Comparison of wastewater treatment in oil and gas industry using conventional methods (chemical, physical and biological)
Authors: Hamdy M , Sudarno  , Huboyo H S 
Published: November 2021

Abstract
The oil and gas industry consumes tons of water, and the water produced from this industry contains harmful substances such as petroleum products and heavy metals that negatively affect humans and the environment. The objective of this research is to know the efficiency of the conventional wastewater treatment technologies (chemical by adding Alum, biological with aeration, and physical by filtration) to treat oily wastewater and the effect of the quantity of Alum on the treatment efficiency by using jar test and laboratory analysis beside modify the system to reuse the treated water in various activities. The treatment results showed a decrease of COD by 27%, BOD by 26.5%, oil and grease by 55%, and heavy metals by 95%, and the final results are compatible with the Egyptian standards. It is found that the optimum alum quantity that can be used is 15 mg/L which can remove 48% of oil and grease. Despite the simplicity and low cost of conventional methods for industrial wastewater treatment compared to advanced methods, they still give acceptable results. Reusing the treated water and sludge saves money, encouraging many industries to use it instead of discharging it.
Environmental impact evaluation of crumb rubber industry production process by life cycle assessment (LCA) method (case study: PT FRP)
Authors: Yerdianti A , Aziz R 
Published: November 2021

Abstract
PT FRP produces crumb rubber SIR 20 with a total annual production of 42.000 tons. This study aims to analyze the environmental impact of 1-ton crumb rubber production using the Life Cycle Assessment (LCA) method to be further explored for recommendations for ecological improvement. LCA was carried by a gate-to-gate scope using SimaPro software with the eco-indicator 99 method. The steps for completing this research refer to ISO 14040:2016. Characterization step results from the category of fossil fuels impact have the highest value (931 MJ surplus). The total value of the single score generated is 369 Pt, with the highest impact value is respiratory inorganics. The dryer drying process, the usage of electricity, and the generator and boiler are four production processes that significantly impact the environment. Improvement recommendations given to reduce the effects of the four processes are using an economizer in the boiler, the combination of fuel used by the boiler, and substitution of diesel fuel with Pertamina Dex as generator’s fuel.
Dry filtration technology application with activated carbon media to remove odor ammonia emissions from production process feed mill industry
Authors: Harihastuti N , Djayanti S , Sari I R J 
Published: November 2021

Abstract
A pilot project research has been conducted to eliminate odor pollution from the feed mill industry. The feed industry in Indonesia has grown, especially in poultry feed production produced in modern feed mills equipped with pelleting technology. This industry is also having an environmental impact in the form of air pollution of its production activities. The laboratory analysis showed that ammonia has emitted, and it was the dominant parameter as the cause of odor in air pollution. This research aims to remove ammonia emissions using dry filtration technology with activated carbon as the filter media in the upright reactor. The reactor is designed from stainless steel material, consisting of 3 trays. The distance between trays is 300 mm, the dimensions of the tray are L.2430 mm, W.1815 mm, H.600 mm, the tray hole diameter is 3 mm. The average gas flow rate is 200-300 Nm3/min. Activated carbon used granules, size 6-8 mm, 200 mm thick in the tray. The results showed that the efficiency of ammonia removal was 81.96%-94.40% and had met the quality standards. This technology is feasible to control ammonia as an odor pollutant in the feed mill industry.
Total mercury pathways from artisanal and small-scale gold mining in Sukabumi using system dynamics model
Authors: Sunaryani A , Ridwan Y S 
Published: November 2021

AbstractArtisanal and small-scale gold mining (ASGM) has been operated in Sukabumi District, West Java, Indonesia, for more than two decades. ASGM uses mercury in a ball mill gold ore processing, and the waste is released into the environment during and after this process. Previous studies have found that mercury-contaminated water, air, sediments, soil, and aquatic biota. This study aimed to predict and analyze total mercury pathways from ASGM in the air, water, sediment, fish, and humans using a system dynamics model. The results showed that the total mercury concentration in water was low and still meets the standard, while the total mercury concentration in sediment had already exceeded the standard. Biomagnification occurred to plankton feeder fish and top predator fish, but still below the level of tolerance mercury. Mercury levels in top predator fish and humans take a long time to exceed the standard (77 and 67 months after entering the body, respectively). The percentage error of 17.67% compared to the experimental data showed that the prediction of the developed system dynamics model is acceptable. Therefore, the model can be used to predict the total mercury pathways in the environment, especially in the ASGM area.
Effect of electrode configuration and voltage variations on electrocoagulation process in surfactant removal from laundry wastewater
Authors: Oktiawan W , Samadikun B P , Junaidi  , Bramahesa I G N , Taqiyya T A , Amrullah M R , Basyar C 
Published: November 2021

Abstract
Almost all human life requires water, one of which is washing clothes. However, city people tend to use laundry services. It is necessary to treat laundry wastewater because it contains parameters that can cause environmental pollution. A promising technique has been found to treat urban wastewater, especially laundry wastewater. An electrochemical method for water treatment is known as electrocoagulation, in which a solution of an active coagulant in the form of metal ions (aluminum or iron) is introduced into a solution. In electrocoagulation, the processes of adsorption, coagulation, precipitation, and flotation taking place. This research was conducted to determine the impact of current on electrocoagulation using Al-Al, Fe-Fe, Al-Fe, Fe-Al electrodes in reducing surfactant levels in laundry wastewater with variations in the voltage used were 20 V, 30 V, 40 V, and 60 V. The results showed that the electrocoagulation process could remove surfactants in laundry wastewater. A voltage of 30 volts with Al-Al electrode configuration was used for 30 minutes to obtain optimum conditions so that it will get a surfactant effluent concentration of 5.77 mg/L with a removal efficiency of 72.89%.