H. Hadiyanto

Universitas Diponegoro | UNDIP · Department of Chemical Engineering

This study investigated ten electrode materials for electrocoagulation-flotation (ECF) of Chlorella vulgaris. Magnesium showed the highest separation efficiency (98.7 %), followed by aluminum (97.34 %), iron (94.42 %), copper (93.17 %), zinc (91.65 %), nickel (91.50 %), lead (90.31 %), titanium (87.14 %), brass (84.92 %), and stainless steel (78.8...

This research aims to examine the use of image processing and texture analysis to find a more reliable and efficient solution for identifying and classifying types of meat, based on their texture. The method used involves the use of feature extraction, Haar wavelet, and gray-level co-occurrence matrix (GLCM) (with angles of 0°, 45°, 90°, and 135°),...

Population growth causes an increase in the need for petroleum. However, petroleum as primary energy is currently increasingly limited in availability. Required alternative energy sources that can be renewed to overcome these problems, one of which is bio-oil. Bio-oil is produced by a pyrolysis process using biomass such as sugarcane bagasse, rice...

Indonesian government is commitment to reduce greenhouse gas emissions, so it is necessary to utilize biomass in power generation as an alternative fuel. This study aims to analyze and evaluate combustion characteristics using TG-DTA (Thermo et al.) with coal, palm kernel shells (PKS), and a mixture of palm kernel shells (PKS) with coal. Sample tes...

This study investigates the impact of various drying temperatures on the performance evaluation of photovoltaic – direct solar dryers in the coffee bean drying process. The use of photovoltaic systems in solar drying provides opportunities for the future to support clean and eco-friendly renewable energy. Three drying temperature conditions were te...

In Indonesia, types of meat are still identified manually due to increasing prices for beef and buf-falo ahead of Idul Fitri. Traders mix beef with pork to thwart the beef scam. Haar wavelet and GLCM, GLCM with angles of 0°, 45°, 90°, and 135°, as well as matrices using contrast, correlation, energy, homogeneity, and entropy, are used in feature ex...

The neem tree has strengths such as effective and environmentally friendly active compounds, as well as the ability to improve the quality and productivity of plants organically. However, the use of botanical pesticides has several challenges, such as potentially lower effectiveness compared to chemical insecticides, high production costs, and requ...

Kaolin is a natural ingredient that is in abundance and has not been widely used. Kaolin is a source of silica (SiO2) and alumina (Al2O3) so that it can be used as a heterogeneous catalyst in biodiesel production. This research aims to examine the influence of using impregnated kaolin as a heterogeneous catalyst on production of biodiesel. Research...

Biomass waste is one of the promising resource for the production of bio oil. In this study, a mixture of biomass waste will be pyrolyzed in the presence of activated carbon and zeolite as the catalyst. The catalyst concentrations were varied at 2%, 4%, 6%, respectively. While, the pyrolysis process was carried out at 500°C, for 60 minutes, with a...

The economic value of bananas is quite low due to the high volume of production and the short shelf life of the fruit. One of the popular methods of preserving agricultural produce is drying. The objectives of this research include determining the drying kinetics curve profile of banana slices and the drying rate using a solar dryer, analyzing the...

The development of low-fat donuts with the addition of gum (guar gum and arabic gum) and apple pomace powder was carried out in this study. The purpose of this study was to improve the nutritional content of the donuts, especially in reducing the fat content of the donuts by using gum and adding apple pomace powder. The variables in this study were...

Microbial fuel cells (MFCs) are an innovative method that generates sustainable electricity by exploiting the metabolic processes of microorganisms. The membrane that divides the anode and cathode chambers is an important component of MFCs. Commercially available membranes, such as Nafion, are both costly, not sustainable, and harmful to the enviro...

Optimalisasi komposisi metil dietanolamin (MDEA) dan monoetanolamin (MEA) sebagai penyerap dalam proses pemurnian gas CO 2 merupakan merupakan upaya penting bagi industri yang bertujuan untuk meningkatkan efisiensi, perlindungan lingkungan, dan keberlanjutan ekonomi dalam operasi tersebut. MDEA dan MEA sangat penting dalam menghilangkan gas asam se...

This study investigates the effectiveness of the Cu-doped Bi2O3 method for removing antibiotics. Cu at varying concentrations of 0%, 2%, 4%, 6%, and 8% was used to synthesize Bi2O3 material successfully. The optimal results were obtained by adding 4% Cu to the Bi2O3 matrix. Cu-doped Bi2O3 was characterized by an energy band gap of 2.32 eV, a crysta...

This paper proposes a modified Haar wavelet algorithm to identify the texture of various types of meat using machine learning (ML). In Indonesia, ahead of Eid al-Fitr, the price of beef continues to increase, of course causing a decrease in beef sales. To anticipate this, some traders mix beef with pork. The pork was chosen because the price of por...

Mixed reality simulator is used as a learning simulation or training related to a disaster mitigation process. As a learning medium, mixed reality allows users to interact simultaneously with objects in a virtual environment and the actual world. One of the technical requirements in designing a mixed reality 3D model is that the assets have to be l...

Textile wastewater has characteristics of concentrated color and containing high concentration of COD, BOD, N, P, and heavy metals. Some wastewater treatments have been developed for removal waste contaminant, especially heavy metal such as precipitation, evaporation, electroplating, ion exchange, and membrane process. These methods have disadvanta...

Machine learning is a successful dynamic tool for forecasting crop yields, as well as for choosing which crops to plant and what to do during the growing season. One of the industrial process models used in data mining is Cross-Industry Standard Process for Data Mining (CRISP-DM), which includes six iterative phases. Crop prediction using various m...

A study on the utilization of biomass in power plants as an alternative fuel was conducted. The benefit of biomass fuel is that it reduces greenhouse gas emissions, namely carbon dioxide, and contributes to reducing the effects of global warming. This paper discusses the characterization of coal and empty fruit bunch (EFB) blends as well as the cha...

The performance of predicted models is greatly affected when the dataset is highly imbalanced and the sample size increases. Imbalanced training data have a major negative impact on performance. Currently, machine learning algorithms continue to be developed so that they can be optimized using various methods to produce the model with the best perf...

Mangrove ecosystem has an important role in reducing carbon in the environment. There has been massive conversion of mangrove area into ponds and buildings in the current period. Therefore, the species diversity and carbon sequestration capacity of the mangrove ecosystem must be evaluated to monitor its function. This research aims to evaluate the...

HHO gas is one promising alternative as an alternative for fossil fuels, nevertheless, several challenges need to be overcome in order for HHO gas to become a viable option for global use. This paper presentsbibliometric analysis, HHO gases production methods, and challenges of using HHO gas. The primary objective of this review paper is to provide...

Berdasarkan kebutuhan energi final pertahun yang mengalami peningkatan pada sektor rumah tangga perlu dikaji lebih dalam. Pengkajian ini bertujuan untuk memastikan pasokan energi primer aman dalam jangka panjang selama periode 2022-2040, dengan laju pertumbuhan penduduk sebesar 1,32 % per tahun. Dampak dari pertumbuhan penduduk mengakibatkan total...

Manusia sejatinya memiliki beberapa kebutuhan yang primer, dalam Haslow Hierarchy kebutuhan primer yang harus dimiliki manusia adalah sandang, pangan, papan, dan energi. Disebutkan bahwa energi merupakan suatu hal yang sangat esensial bagi keberlangsungan hidup suatu umat manusia, dan serta seluruh kegiatan manusia dalam menunjang keberlangsungan h...

Biodiesel is produced from oils esterified with alcohol into glycerol and water. Vegetable edible oil raw materials are the main consideration in biodiesel production. This study used three types of oil, namely palm oil (PO), waste frying oil (WFO), soybean oil (SO), and corn oil (CO), with the catalyst of the enzyme lipase. The price of WFO as raw...

Currently, there are four major protocols for EV roaming that support electric vehicle drivers to access charge points from different networks with a single user registration through roaming agreements between charge point operators (CPOs) and mobility service providers (MSPs): the Open Clearing House Protocol (OCHP), the Open InterCharge Protocol...

Chlorella pyrenoidosa has been grown in artificial vinasse digestate. The method being used is intended to gather data on kinetic parameters that govern the performance of C. pyrenoidosa cultivated in a medium containing bacterial components. This condition was developed by introducing 1000 μL of Bacillus cereus to the medium (5 ppm of vinasse: 15...

Bio-oil is an environmentally friendly liquid fuel produced from the condensation of vapor product of pyrolysis process. Bio-oil has higher calorific value compared to other oxygenated fuels (such as methanol), but its calorific value is still lower than diesel and other light fuel oils. Bio-oil can be used directly as fuel; however, it has several...

Bio-oil is an environmentally friendly liquid fuel produced from the condensation of vapor product of pyrolysis process. Bio-oil has higher calorific value compared to other oxygenated fuels (such as methanol), but its calorific value is still lower than diesel and other light fuel oils. Bio-oil can be used directly as fuel; however, it has several...

The COVID-19 pandemic has mandated people to use medical masks to protect the public. However the improper management of disposable mask waste has led to the increase of marine pollution, in terms of water quality, and the decline in aquatic microorganisms. The aim of this research was to investigate the impact of disposable mask waste on fresh wat...

Biomass is a good resource for renewable energy. Biomass can be converted into bio-fuel (bio-oil) through a catalytic fast pyrolysis process. Previous studies only used single feedstock biomass as raw material for bio-oil production. In this study, bio-oil production is based on a multi-feedstock biomass waste consisting of rice husk, sugar cane ba...

The Open Charge Point Protocol (OCPP) has been considered the de-facto standard for communication between charge points and the central management system of the charge points. This paper presents a novel messages testing tool based on OCPP 1.6 to evaluate the conformance of the central system to the field category definitions specified by OCPP. The...

Tomato is a fruit with various benefits that has been used widely either for household needs or industries. However, it is easily spoiled if not treated correctly due to its high moisture content. In this experiment, a newly-designed solar dryer with automatic data measurement system was applied for tomato slices drying, along with sun drying metho...

In the manufacture of bioethanol made from lignocellulose, lignin content becomes the main inhibitor in the conversion of bioethanol. Cellulose is coated by lignin making it difficult to hydrolyzed into glucose. Therefore, pretreatment of lignocellulose raw materials is required. Pretreatment aims to separate the bond between lignin and cellulose (...

One of the wastes produced by the Palm Oil Milling Industry (POM) is CaCO3 waste which comes from the kernel and shell separation process in claybath. This waste processing has not been carried out optimally by the POM, due to lack of information in waste processing. This causes the CaCO3 waste to be thrown away at the factory. This study aims to p...

The study focuses on malnutrition. Dietary intake influences malnutrition. Indonesians choose dry noodles due of their portability. Dry noodles often include more carbohydrates than protein; consequently, the addition of Spirulina platensis may increase their protein level while de-creasing their carbohydrate load. This research evaluated the level...

Smaller size plastics known as microplastics are harmful for marine biota as well as humans. One of the common methods for the removal of microplastics from water is coagulation. Chicken eggshells and chitosan are two natural ingredients which contain useful content for the coagulation process. Therefore, this paper describes the effect of concentr...

Mango is the second most-produced fruit in Indonesia, and the quantity of mangoes produced reached 2,624,791 tons at the end of 2018. This fruit is prone to rotting and getting wasted. Therefore, innovation is required to preserve mangoes by processing them into dehydrated food products using drying techniques. Freeze drying is still considered an...

The need of renewable energy is paramount important as it is expected to replace fossil energy. One of renewable energy commonly used for rural area is biomass-based energy. Biogas is a biomass-based energy where organic materials are converted to methane gas via anaerobic digestion process. The limitations of mono-feedstock biogas are instability...

Cleanliness has become an integral element of daily living. Soap is often used as a cleaning agent. Soap can remove grime and microorganisms that adhere to the skin. Various types of fats or oils are often utilized as soap's primary constituents. The usage of these diverse oils alters the properties of soap, beginning with its hardness, its impact...

The economically feasible study has become an important factor in today's societies due to achieve the well-being of people. The study analyzed the economic perspective of biomass energy from several secondary data locally and globally. The main target of this study aims to explore the economic perspective of biomass energy in Indonesia. The purpos...

Pekerjaan perlindungan lereng adalah salah satu pekerjaan yang umum ditemui dalam proyek konstruksi, terutama proyek-proyek infrastruktur, salah satunya adalah Proyek Pembangunan Bendungan Leuwikeris, Ciamis, Jawa Barat. Pada proyek tersebut, pengamanan lereng dilakukan dengan menggunakan shotcrete, namun pada praktiknya, ada beberapa lereng yang t...

The current laboratory-scale production of biodiesel from multiple feedstocks has the potential to be a large-scale industrial process. Thus, the energy balance of the production of biodiesel from multiple feedstocks must be studied. This study compares the energy balance of the production of biodiesel from multiple feedstocks to the production of...

Hydrogen energy is environmental-friendly and considered an attractive alternative to fossil fuels. Among the feasible technologies for hydrogen generation, photocatalysis-derived hydrogen from water splitting is considered to be the optimal solution for meeting long-term sustainability and increased energy demands. In this context, various photoca...

The production of biodiesel from multiple feedstocks, which is now conducted on a laboratory scale, has the potential to be scaled up to an industrial level in the future. Consequently, it is essential to evaluate the environmental effect of multi-feedstock biodiesel production. This study compares the environmental performance at the end-point lev...

Fucoxanthin from microalgae is promising since the productivity is higher compared to macroalgae. However, dynamic environmental and nutritional factors in large scale and outdoor condition still limiting the production. This research investigated co-cultivation of Chaetoceros calcitrans and Arthrospira platensis growing under outdoor condition and...

Tuntang River downstream, located in the Demak Regency, Central Java, frequently experiences floods caused by sedimentation, which has occurred continuously since 1970. Changes in land use resulted in ample surface runoff water. The phenomenon affects society’s activities around the Tuntang River downstream which can hinder their activities. The st...

The government through Law No. 30 of 2007 concerning Energy, seeks to manage the energy sector in Indonesia in a fair and equitable manner and provide benefits to all Indonesian people. The pattern of energy consumption which increases every year in line with the increase in population illustrates that a concerted effort is needed to increase the r...

Emissions of carbon monoxide (CO) and carbon dioxide (CO2) gases are the main problem that must be rectified as they are harmful and contribute to global warming through the greenhouse gas effect. In Indonesia, motor vehicles, especially four- wheelers, are one of the biggest contributors with up to 71 million tons of CO2 emissions and energy consu...

This article discusses previous research studies that indicate the benefits and advantages of using information technology in learning. The research is to ascertain elementary school teacher education students' perceptions of integrating information technology in learning. The type of this research is qualitative survey research. The research was c...

Background: The risk of fatal infection and death from Coronavirus disease 2019 (COVID-19) exposure increases in the elderly and those with coexisting illnesses such as cardiovascular disease, diabetes, cancer, obesity, and hypertension. The COVID-19 vaccine's efficacy and safety have been supported by numerous research. However, data from the Min...

POME is an excellent cultivation medium for the production of microalgae because it includes high macro and micronutrients. Nevertheless, microalga cultivation is laborious to maintain under outdoor condition. The aim of this reseasch was to evaluate the potency of co-cultivation strategy to improve growth and lipid production of mixed algae when g...

Biodiesel has recently received much attention as an energy source with numerous benefits such as high degradability, negligible toxicity, and minimal emissions of carbon monoxide gases as well as particulates. Therefore, this research aims to compare, review, and summarize the conventional and advanced methods of biodiesel production. Currently, s...

Microalgae is a third-generation biomass source that can potentially be used as a raw material for bioethanol production. Microalgae is a viable alternative energy source to substitute or complement fossil fuels based on the disadvantages related to first- and second-generation biofuels. Bioethanol from microalgae sources does not compete with food...

Roaming in electric mobility (EV roaming) enables EV users to make use of any charging station belonging to other networks with only a single user registration based on roaming agreement between operators. This paper presents an overview of the functionalities of the four major existing EV roaming protocols, namely the Open Charge Point Interface (...

This research paper discusses the everyday life ideology of Balinese society popularly called “Tri Hita Karana” as a local cultural identity reflected in a literary work of Elizabeth Gilbert’s Eat Pray Love by using anthropological approach in literature. The result of the research indicates that Balinese society culturally applies and strongly rel...

Proyek Pembangunan Bendungan Pamukkulu Makassar merupakan salah satu dari Proyek Strategis Nasional (PSN). Bendungan yang terletak terletak di Provinsi Sulawesi Selatan, tepatnya di Kabupaten Takalar ini direncanakan akan memiliki kapasitas sebesar 81,3 juta m3 yang diharapkan dapat mengairi lahan seluas 6.430 ha, mengurangi debit banjir sebesar 15...

Penelitian ini dilakukan berdasarkan hasil pengamatan penulis mengenai supervisi Kepala Sekolah Dasar Negeri Se Kecamatan IX Koto Sungai Lasi Kabupaten Solok masih belum terlaksana dengan optimal. Tujuan dari penelitian ini adalah untuk mendapatkan informasi dan memperoleh data tentang pandangan guru terhadap supervisi kepala sekolah yang dilihat d...

Energy consumption from non-renewable fuels is increasing, so there is a need for a new energy source from microalgae. The microalgae Chlorella vulgaris has a high lipid content ranging from 2-77% of the dry weight of the biomass, but it small size, ranging from 2-10 micrometers, which makes it uneconomical at the harvesting stage. One of the cheap...

This research aimed to evaluate the effectiveness of microalgae Dunaliella salina in the biodegradation process of oxidized oxium and HDPE plastics. Microalgae and microplastic interactions were evaluated in two 1 L glass bioreactors containing D. salina with oxium microplastics and oxidized HDPE at various concentrations (100 mg/500 mL, 200 mg/500...

Pengeringan merupakan salah satu proses untuk memperpanjang masa simpan dari bahan yang dikeringkan. Jamur tiram merupakan suatu komoditas yang mempunyai masa simpan yang cukup singkat karena mempunyai kadar air yang cukup tinggi. Untuk memperpanjang masa simpan perlu dilakukan proses pengeringan. Banyak metode pengeringan yang dapat dilakukan untu...

The need for batteries will increase change from conventional vehicles to electric vehicles. Electric vehicles are used as an effort to reduce CO 2 emissions that can cause global warming. The acceleration for the development of the electric vehicle industry is also supported by Indonesia's ability to produce nickel which is a commodity in electric...

The production of biodiesel using Palm Fatty Acid Distillate (PFAD) assisted by magnetic nanoparticle lipase catalyst impregnated with Activated Carbon Oxide (ACO) has been studied. This study aims to examine the use of a magnetic nanoparticle lipase catalyst impregnated with activated carbon oxide in the production of biodiesel through a simultane...

Environmental degradation due to using conventional fossil fuels remains an obstacle to sustainable development. For this reason, many countries consider the integration of renewable energy sources into their power sectors as an economically friendly and promising alternative to the use of fossil fuels. One form of green technology is the pico-prop...

This study examines the water quality of the Kedung Jumbleng River which is used as a tofu liquid waste disposal site and the behavior of the surrounding community which aims to find out how the water quality of the Kedung Jumbleng River is, community behavior, and steps to control pollution. The study was identified through literature searches or...

Flocculants agglomerate suspended microalgae cells, while cost and toxicity have led to the increased use of bio-flocculants. In this experiment, Chlorella pyrenoidosa was gathered by utilizing bio-flocculants from discarded clam shells. At pH 8, 0.2 mg/mL of bio-flocculant clam shell, 0.1 mg/mL of cationic inducer, and 240 rpm of mixing achieved 9...

Biodiesel production from multiple feedstocks, which is currently being carried out on a laboratory scale, has the potential to be scaled up on an industrial scale in the future. Therefore, it is necessary to study the environmental impact of multi-feedstock biodiesel production. This study assesses the environmental performance of the simulated pr...

Indonesia and Malaysia are recognized as the world's leading producers of palm oil. Along with the growth of the palm oil industry in Indonesia, the amount of Palm Oil Mill Effluent has increased. Palm Oil Mill Effluent (POME) is a liquid byproduct of the palm oil production process. POME has been treated using aerobic and anaerobic ponds to lower...

Along with the growth in oil palm output, the amount of trash produced will also increase. Every palm oil mill is responsible for the disposal of liquid waste known as palm oil mill effluent (POME). POME includes very high levels of BOD and COD, which may hinder the development of microalgae. Before POME may be utilized as a medium for the growth a...

Tujuan penelitian ini adalah untuk melakukan analisis penggunaan video animasi untuk meningkatkan keterampilan menyimak dan hasil belajar peserta didik pada pembelajaran Tematik di kelas 5 Sekolah Dasar kabupaten Aceh Barat Daya. Pada penelitian ini peneliti menggunakan penelitian eksperimen yang berhubungan dengan angka-angka yang dihitung secara...