Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.10003

Perwitasari Perwitasari, Heni Anggorowati, Susanti Rina Nugraheni, I. Lestari

引用次数: 0

Efek Penambahan Bahan Aditif Non-Alami terhadap Perilaku Lempung Plastisitas Tinggi yang Distabilisasi dengan Semen 用水泥稳定的高塑粘土行为增加非天然添加剂的影响

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9517

Soewignjo Agus Nugroho, Bambang Wisaksono, Heru Suharyadi

{"title":"Efek Penambahan Bahan Aditif Non-Alami terhadap Perilaku Lempung Plastisitas Tinggi yang Distabilisasi dengan Semen","authors":"Soewignjo Agus Nugroho, Bambang Wisaksono, Heru Suharyadi","doi":"10.31315/e.v20i2.9517","DOIUrl":"https://doi.org/10.31315/e.v20i2.9517","url":null,"abstract":"Cement is proven increasing the strength of soft clays. Monmorillonite has a high shrinkage. Another hand, Kaolin has a small shrinkage. Waste material usage for stabilization agent was widely carried out this decade. BAFA (bottom ash fly ash) and POFA (palm oil fuel ash) are rich in Silica and Alumina, so they used to substitute of cement. The study examined the effect of Monmorillonite, Kaolin, BAFA and POFA on stabilization of clay with cement. Bentonite from 4% to 16% (is equated to BAFA and POFA, in ratio of 2:1) and Kaolin by 2.5%, used to reduce clay shrinkage, mixed with cement by 3% and 5%. Soil behavior will be reviewed from laboratory tests on curing-noncuring and soaked-unsoaked conditions. The results show changes in Atterberg Limits and Hydraulic Conductivity (permeability, k). Cement as well as BAFA and POFA reduce Plastic Limit greater than Liquid Limit. So, Plasticity Index decreased. It’s can be seen that cement and ash waste decreasing the permeability value. More Ash and less cement, make more impermeable soil. Addition of 3% and 5% cement increased the UCS values from 14.32 kPa to 81.20 kPa and 589.68 kPa and CBR value from 0.78% to 4.20% and 589.68 42.12% respectively","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48972276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analisis Termogravimetri dan Dekomposisi Termal pada Produksi Bio-Oil dari Daun Tebu Menggunakan Proses Pirolisis Cepat 利用快速热解过程对甘蔗生物油生产的热力学和分解分析

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9849

Ilham Mufandi, Ratchaphon Suntivarakorn, Wasakorn Treedet, Piyapong Singbua

{"title":"Analisis Termogravimetri dan Dekomposisi Termal pada Produksi Bio-Oil dari Daun Tebu Menggunakan Proses Pirolisis Cepat","authors":"Ilham Mufandi, Ratchaphon Suntivarakorn, Wasakorn Treedet, Piyapong Singbua","doi":"10.31315/e.v20i2.9849","DOIUrl":"https://doi.org/10.31315/e.v20i2.9849","url":null,"abstract":"Sugarcane leaves are one of the agro-industrial wastes derived from sugarcane plants. In this research, sugarcane leaves are used as raw material for pyrolysis which produces three main products: liquid, solid, and gas. The focus of this research is to identify the effect of temperature on pyrolysis, identify mass changes, identify decomposition, and identify the chemical composition of bio-oil. The pyrolysis was carried out using a Circulating Fluidized Bed (CFBr) reactor with pyrolysis temperature variations from 440oC to 520oC. Analysis of pyrolysis characteristics of sugarcane leaves are used thermogravimetric analysis (TGA), DTA, and GC-MS analysis. The results showed that the operating temperature had a significant effect on the pyrolysis process. The highest bio-oil found at 480oC, namely 34.33%. TGA results show that the decomposition process of sugarcane leaves is divided into 3 stages: 1) dehydration of water content occurs at <200oC, 2) active pyrolysis occurs from 200oC to 380oC, and 3) passive pyrolysis occurs at temperature from 380oC to 500oC. DTA results show that the thermal changes are affected by the pyrolysis heating rate. The highest bio-oil compounds are β-D-Glucopyranose 1,6-anhydro, acetic acid, and 2-Propanone 1-hydroxy-. This research proves that temperature has an important role in the pyrolysis process.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46155897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pemanfaatan Sludge Ash Pond PT. Cirebon Electrical Power (CEP) sebagai Bahan Bakar Alternatif 使用泥灰池PT。井里汶电力公司（CEP）作为替代燃料

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9845

Agik Dwika Putra, Ilham Satria Raditya Putra, Rochim Bakti Cahyono

{"title":"Pemanfaatan Sludge Ash Pond PT. Cirebon Electrical Power (CEP) sebagai Bahan Bakar Alternatif","authors":"Agik Dwika Putra, Ilham Satria Raditya Putra, Rochim Bakti Cahyono","doi":"10.31315/e.v20i2.9845","DOIUrl":"https://doi.org/10.31315/e.v20i2.9845","url":null,"abstract":"As one of the power plants that uses coal as an energy source, PT Cirebon Electric Power (PT CEP) is committed to addressing waste problems with the 3R principle. Sludge ash ponds which is waste of the process production has the potential for alternative fuel. This study aims to evaluate the utilization of sludge ash ponds with the main target parameter in the form of calorific value. Based on proximate analysis, sludge pond ash only had a low heating value, around 210 kcal/kg, thus unbeneficial to be used as fuel directly. In order to make efficient utilization, a pyrolysis process was carried out to increase the existing heating value and was obtained at 700 – 870 kcal/kg. Generally, the standard of alternative fuel had minimum heating value of 4500 kcal/kg, therefore the blending process was carried out based on the fuel availability in the industrial site. The results of blending using coal showed that the high heating value of mixed briquette product was achieved at elevated more coal content used. By paying attention to the standard heating value, the ratio composition of ash pond to coal, 20/80 satisfy for utilization, where the heating value was around 4600 kcal/kg. The blending proses using pyrolysis char of ash pond showed un significant effect on the increasing of heating value, for example in a 40/60 ratio, the difference between the two types materials was only 210 kcal/kg. Therefore, pyrolysis pretreatment of sludge ash pond had unsignificant impact compared to the energy expended to run the process","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43832308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pengaruh Perbedaan Jenis dan Konsentrasi Sumber Nitrogen (NaNO3 dan urea) terhadap Produksi Biomasa Spirulina Platensis 氮源(纳米3和尿素)对水晶体生物生成的不同类型和浓度的影响

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9367

Iqbal Syaichurrozi, Yustinus Selis Toron, Sharfan Dwicahyanto, Wardalia Wardalia

引用次数: 0

Evaluation of Diffusivity Values and Extraction Speed Constants on Black Pepper Piperine Isolation 黑胡椒胡椒碱分离的扩散值和萃取速度常数的评价

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.8996

M. Mustikaningrum, Desty Arista, R. D. Nyamiati, Dodi Eko Nanda

引用次数: 0

Metode Modifikasi Membran Polietersulfon (PES) Untuk Meningkatkan Antifouling−Mini Review Modifikasi Membran 聚醚砜膜改性提高防污性能的方法——膜改性综述

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9596

Enny Nurmalasari, Hasnah Ulia, Apsari Puspita Aini, Agung Kurnia Yahya, Yunita Fahni

{"title":"Metode Modifikasi Membran Polietersulfon (PES) Untuk Meningkatkan Antifouling−Mini Review Modifikasi Membran","authors":"Enny Nurmalasari, Hasnah Ulia, Apsari Puspita Aini, Agung Kurnia Yahya, Yunita Fahni","doi":"10.31315/e.v20i2.9596","DOIUrl":"https://doi.org/10.31315/e.v20i2.9596","url":null,"abstract":"Polyethersulfone (PES) is the most common material in various medical and water treatment applications because of its excellent mechanical and thermal properties. The hydrophobicity of polyethersulfone is considered as one of the main drawbacks because the hydrophobic surface causes a high biofouling effect on the membrane, so it has limitations in using Polietersulfon PES membrane technology. Modification of PES membranes is an important topic to be continuously developed to improve the properties of PES membranes. Membrane modifications focus on increasing the hydrophilicity, selectivity, and stability of membranes that are expected to be used commercially. Modifications were made to change the hydrophobic membrane surface into a hydrophilic membrane with good mechanical properties by introducing hydrophilic properties and functional groups to the polyethersulfone membrane surface. This review includes reviews and discussions on modifying PES membranes by mixing, coating, and grafting methods. In particular, adding functional groups to polyethersulfone is a suitable method for introducing hydrophilic properties. The addition of nanomaterials to the surface of the polyethersulfone membrane by mixing, coating, grafting, and combinations significantly increases the surface of the membrane, and all modifications affect the surface roughness of the membrane.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46141477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimasi Aplikasi Pelapisan Nanopartikel Seng Oksida pada Kain Katun-Indigo dengan Response Surface Methodology

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9877

Renung Reningtyas, Edia Rahayuningsih, Yuni Kusumastuti, Indria I Kartini

引用次数: 0

Pemanfaatan Karbon Aktif Kulit Pisang Kepok dan Karbon Aktif Tempurung Nipah sebagai Biosorben untuk Pengolahan Limbah Cair Laundry 用散装圆盘活性煤和活性废壳炭作生物吸附剂清洗废液

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9681

Ilma Fadlilah, A. Pramita, Nurlinda Ayu Triwuri, Heni Anggorowati

{"title":"Pemanfaatan Karbon Aktif Kulit Pisang Kepok dan Karbon Aktif Tempurung Nipah sebagai Biosorben untuk Pengolahan Limbah Cair Laundry","authors":"Ilma Fadlilah, A. Pramita, Nurlinda Ayu Triwuri, Heni Anggorowati","doi":"10.31315/e.v20i2.9681","DOIUrl":"https://doi.org/10.31315/e.v20i2.9681","url":null,"abstract":"The use of kepok banana peel activated carbon (AC-KPK) and nipa shell activated carbon (AC-TN) to adsorb phosphate ions in laundry waste has been successfully carried out. Characterization of activated carbon was carried out with SEM-EDX. The results of the morphological analysis showed that the pore sizes in AC-KPK and AC-TN were included in the macropore category. The elemental content of the AC-KPK adsorbent is C 74.9%; 23.6% O and 1.5% K, whereas in the AC-TN adsorbent it was observed that C elements were 70.7%; O 25.5%; K 2.0% and other elements such as Ca, Na, Mg and Cl are contained in small quantities. The optimum contact time needed by AC-KPK to adsorb phosphate ions in laundry wastewater is 15 minutes with an adsorption efficiency of 98.83%, the AC-TN adsorbent is 5 minutes with an adsorption efficiency of 99.52%, and the combination of AC-KPK&AC- TN resulted in a contact time of 5 minutes with an adsorption efficiency of 99.91%. The adsorption kinetics of phosphate ions with the three adsorbent media followed the pseudo second order model with adsorption rates for the adsorbents AC-KPK, AC-TN, and the combination AC-KPK & AC-TN respectively 3.9400 g/mg.min; -28.7119 g/mg.minute; and -10.8895 g/mg.min.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45496890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigasi Model Machine Learning Berbasis QSPR pada Inhibitor Korosi Pirimidin Investigasi模型机器学习小檗QSPR pada抑制剂Korosi Pirimidin

Eksergi Pub Date : 2023-07-03 DOI: 10.31315/e.v20i2.9864

Muhamad Akrom, T. Sutojo

{"title":"Investigasi Model Machine Learning Berbasis QSPR pada Inhibitor Korosi Pirimidin","authors":"Muhamad Akrom, T. Sutojo","doi":"10.31315/e.v20i2.9864","DOIUrl":"https://doi.org/10.31315/e.v20i2.9864","url":null,"abstract":"Since corrosion causes considerable losses in many fields, including the economy, environment, society, industry, security, and safety, it is a major concern for the industrial and academic sectors. Damage control of materials based on organic compounds is currently a field of great interest. Because it is non-toxic, affordable, and effective in a variety of corrosive situations, pyrimidine has potential as a corrosion inhibitor. It takes a lot of time and resources to carry out experimental investigations in the exploration of potential corrosion inhibitor candidates. In this study, we evaluate the gradient boosting regressor (GBR), support vector regression (SVR), and k-nearest neighbor (KNN) algorithms as predictive models for corrosion inhibition efficiency using a machine learning (ML) approach based on the quantitative structure-property relationship model (QSPR). Based on the metric coefficient of determination (R2) and root mean square error (RMSE), we found that the GBR model had the best predictive performance compared to the SVR and KNN models as well as models from the literature for pyrimidine compound datasets. Overall, our study offers a new perspective on the ability of ML models to predict corrosion inhibition of iron surfaces","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46038035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eksergi最新文献