ABSTRACT Riau Province possesses significant tourism potential; however, a portion of its residents tend to prefer tourist destinations outside the region, such as West Sumatra. One contributing factor is the lack of an information system capable of providing personalized tourism recommendations. This study aims to develop a tourism recommendation website based on a Hybrid Recommender Syst…
ABSTRACT We are entering an era of energy transition, in which the use of fossil fuels is being increasingly replaced by new renewable energy sources, which are considered to be environmentally friendly and low in carbon emissions. This can be seen in the increasing number of decentralised power plants (PT), which are integrated by new renewable energy plants, one of which is the solar power p…
ABSTRACT Activated carbon is widely known as an adsorbent material in various purification applications, including in the processing of liquid smoke. This study aims to determine the effect of temperature and activation time of activated carbon calcination on purification of liquid smoke. Dry oil palm frond waste with an amount of 6 kg was carbonized using the torrefaction method producing a c…
ABSTRACT Activated carbon is widely known as an adsorbent material in various purification applications, including in the processing of liquid smoke. This study aims to determine the effect of temperature and activation time of activated carbon calcination on purification of liquid smoke. Dry oil palm frond waste with an amount of 6 kg was carbonized using the torrefaction method producing a c…
ABSTRACT Oyster mushroom baglog waste is a residual growing medium left after oyster mushroom cultivation that is no longer productive if not managed properly, it can cause enviromental problems. This study aims to determine the effect of varying Promi concentrations and composting durations on the quality of compost produced from oyster mushroom baglog waste. The method used is anaerobic deco…
ABSTRACT Oyster mushroom baglog waste is a residual growing medium left after oyster mushroom cultivation that is no longer productive if not managed properly, it can cause enviromental problems. This study aims to determine the effect of varying Promi concentrations and composting durations on the quality of compost produced from oyster mushroom baglog waste. The method used is anaerobic deco…
ABSTRACT Toothpaste is a preparation for cleaning and polishing the surface of teeth consisting of fine CaCO3 (calcium carbonate), mixed with glycerin plus natural ingredients to inhibit the growth of germs and provide a fresh taste so that users like it. This study used variations of betel leaf extract with the maceration method. The solvent used must be able to extract the desired substance …
ABSTRACT The increasing production of oyster mushrooms (Pleurotus ostreatus) has led to a significant rise in baglog waste. This waste has the potential to pollute the environment if not properly utilized. One way to manage this waste is by processing it into compost. However, the low nitrogen content in baglog waste necessitates the addition of other materials, such as cow manure and bioactiv…
ABSTRACT The increasing production of oyster mushrooms (Pleurotus ostreatus) has led to a significant rise in baglog waste. This waste has the potential to pollute the environment if not properly utilized. One way to manage this waste is by processing it into compost. However, the low nitrogen content in baglog waste necessitates the addition of other materials, such as cow manure and bioactiv…
ABSTRACT Rice husk is an organic material that has a high lignocellulose content, making it potential for use as an adsorbent. One method of preparing adsorbents is through activation with Sodium Hydroxide (NaOH), Phosphoric acid (H3PO4), and without activation. The aim of this research is to study the effect of varying concentrations of NaOH and H3PO4 as activators on the adsorption capac…
ABSTRACT Sago pulp is a biomass waste that is rich in cellulose and starch as a by-product produced by sago flour processing factories that have not been optimally utilized. In this study, sago pulp waste is processed into biopellets as an alternative energy source to replace fuel in households. This study aims to analyze the physical characteristics of biopellets and determine the best variat…
ABSTRACT Partial Discharge (PD) is an early indicator of insulation degradation in medium-voltage cables, which may lead to severe failures in the power distribution system if not detected at an early stage. This study aims to analyze the condition of 20 kV medium-voltage cable lines using the Oscillating Wave Test System (OWTS) method based on a Damped Alternating Current (DAC) voltage source…
ABSTRACT Faults in electrical transmission lines, especially short-circuit faults, can cause power system instability and damage electrical equipment, making accurate identification and classification methods essential. This study aims to develop a fault detection method using Wavelet Transform (WT) for feature extraction and Radial Basis Function Neural Network (RBFNN) for classification.…
ABSTRACT Instant bread yeast is a common leavening agent used in bread making and contains the microorganism Saccharomyces cerevisiae. However, natural yeast is now being considered as an alternative due to its several advantages, including the ability to enrich flavor, extend product shelf life, and be more easily digested. This research aims to produce natural yeast through the fermentation …
ABSTRACT Empty Palm Fruit Bunch (EFB) is a by-product of the palm oil industry that is abundant in Riau Province. The high cellulose content in EFB has the potential to be developed as a basic material for making activated carbon, which is the type of adsorbent most widely developed for heavy metal adsorption. This study aims to analyze the best carbonization temperature and time on the qu…
ABSTRACT Printing wastewater contains heavy metals such as lead (Pb) and copper (Cu), which are toxic. This study aimed to evaluate the effect of pH and stirring speed on the adsorption efficiency and capacity of Pb and Cu using a composite adsorbent of Spent Bleaching Earth (SBE) and Spent Mushroom Substrate (SMS) with a composition ratio of 25% SBE and 75% SMS. Characterization was conducted…
ABSTRACT Industrial printing wastewater contains heavy metals such as lead (Pb) and copper (Cu), which are toxic and difficult to degrade, thus requiring an effective treatment method. One alternative to reduce heavy metals is the adsorption method using a composite adsorbent made from Spent Mushroom Substrate (SMS) and Spent Bleaching Earth (SBE). This study aims to determine the removal …
ABSTRACT The problem of leaf litter and ketapang twig accumulation at the Faculty of Engineering, University of Riau, has prompted innovative efforts in its management. One approach that can be taken is to apply TOSS (Waste Management Technology at the Source) in managing this waste. This study aims to analyze the physical characteristics of biopellets produced from the TOSS biodrying pro…
ABSTRACT The increase in palm oil production in Indonesia produces abundant solid waste, one of which is empty oil palm bunches (EFB) which has the potential to be used as raw material for activated carbon. This study aims to analyze the best concentration and activation time on the quality of EFB activated carbon, the ability of EFB activated carbon to adsorb Cu²⁺ metal ions, and to an…
ABSTRACT Liquid waste produced by industry contains various kinds of chemical compounds that are difficult to dissolve such as lead metal from the pulp and paper industry and copper from the electroplating industry, so it is necessary to treat industrial liquid waste. The aim of this study is to obtain the optimal contact time and pH in the bioabsorption of heavy metals Pb(II) and Cu(II) by ca…