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All Journal Jurnal Teknik Kimia USU KOVALEN: Jurnal Riset Kimia Chimica et Natura Acta Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia FLUIDA Kumawula: Jurnal Pengabdian Kepada Masyarakat International Journal of Applied Technology Research Jurnal Teknik Kimia USU Jurnal Teknik Kimia dan Lingkungan Journal Serambi Engineering (JSE) Advance Sustainable Science, Engineering and Technology (ASSET)
Robby Sudarman
Jurusan Teknik Kimia, Politeknik Negeri Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Treatment and Handling of Hydraulic Shock Load of Urea Fertilizer Wastewater in Sequencing Batch Reactor Budiastuti, Herawati -; Nurazizah, Annisa; Apriyanti, Fitri; Sudarman, Robby; Ramadhani, Laily Isna; Pullammanappalil, Pratap
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 1 (2024): February 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i1.135

Abstract

The production process in the urea fertilizer industry produces wastewater with a very high ammonia content, which exceeds the quality standards for fertilizer wastewater. Therefore, it is necessary to treat urea fertilizer wastewater, which has a high ammonia content. One of the technologies that can be used to treat this type of wastewater is the Sequencing Batch Reactor (SBR) technology. The SBR technology was chosen because it only requires one reactor for the entire process, in which in conventional activated sludge systems it occurs in several reactors. Shock loading often occurs in wastewater treatment plants, including both organic shock loads and hydraulic shock loads. The waste used in the SBR operation in this research is urea fertilizer wastewater originating from a urea fertilizer industry in West Java, Indonesia. The parameters to be tested were COD, MLVSS, DO, pH, temperature, turbidity, and ammonia concentration. The results showed that the efficiency of reducing ammonia levels under normal loading with a flow rate of 300 mL/day was 99.5%, whereas when given a shock load of 600 mL/day, an efficiency of 98% was obtained. This proves that SBR can handle shock loads even though its efficiency slightly decreases.
Effect of Phosphate Concentration on Anodizing Process Efficiency and Aluminium Surface Hardness in 16% Sulfuric Acid Solution Sudarman, Robby; Indarti, Retno; Nurcahyo, Nurcahyo; Fauzan, Ahmad; Ngatin, Agustinus; Sihombing, Rony Pasonang
Fluida Vol. 17 No. 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.4461

Abstract

One of the problems the aircraft industry faces is equipment that has decreased performance in the period before planning. The solution to this condition is that a material that has hard properties and is corrosion-resistant is needed. Aluminium is a metal that is applied as equipment in the industry because it has the characteristics of being light, strong, corrosion resistant and easy to shape, but has properties that are easy to deform, have low hardness and wear resistance. Anodizing process has the characteristics to improve the surface properties of aluminium metal in physical and mechanical properties. The anodizing process of aluminium metal using sulfuric acid solution produces a thicker oxide layer than in other solutions, such as phosphoric acid solution. This research studied the effect of phosphoric acid concentration on process efficiency, oxide layer thickness, and the hardness of the anodized oxide layer in 16% sulfuric acid solution. Phosphoric acid solution concentration varied from 0; 0.5; 1;2;4; and 8% in 16% sulfuric acid solution at 5 Volts voltage or 1.12 A/dm2 current density with 25 minutes processing time. The results showed that the anodizing process in 16% sulfuric acid solution had the lowest efficiency of 19.3% after adding variations in the concentration of phosphoric acid. These conditions reached the optimum in 16% sulfuric acid solution with the addition of 1% phosphoric acid; 26.6 mg oxide mass; 50.33% efficiency; 90.48 mg/dm2 oxide layer thickness and 86.57 HV metal surface hardness
Dual-Chamber Microbial Fuel Cell for Bioelectricity Generation Using Coastal Sediments: A Case from Kendari Bay Ahmad, La Ode; Istianandar, Muhammad Iqbal Sya'bani; Wa Ode Novi Haryanti; Zaeni, Ahmad; Alwahab; Yunus, La Ode Ichlas Syahrullah; Husaeni, Yusuf Ahmad; Robby Sudarman
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.2086

Abstract

This study evaluates the potential of Kendari Bay sediment as an alternative source of electrical energy through the dual-chamber Sediment Microbial Fuel Cell (SMFC) technology. The research focused on sediment characterization, performance analysis using an aerator and KMnO₄, post-operation substrate changes, and the identification of electrogenic bacteria. The results showed that the sediment contained 43.24% moisture, 4.23% organic carbon, 1.08% total nitrogen, a C/N ratio of 3.92, pH 7.38, and conductivity of 11.56 mS. The SMFC generated a voltage of 0.404 V (aerator) and 1.628 V (KMnO₄), along with a current of 5.0 µA. After SMFC operation, organic content decreased, with 42.65% moisture, 4.06% organic carbon, 0.97% total nitrogen, a C/N ratio of 4.19, pH 7.86, and conductivity of 15.78 mS. Identified bacteria were Gram-positive Bacillus spp. These findings demonstrate that aerator and KMnO₄ application in dual-chamber SMFC significantly enhance energy conversion efficiency using marine sediment.
Pengolahan Air Limbah Tahu Menggunakan Metode Elektrokoagulasi dan Adsorpsi Secara Kontinyu: Tofu Wastewater Treatment Using Continuous Electrocoagulation and Adsorption Method Wahyuni, Ninik Lintang Edi; Nurcahyo; Leoanggraini, Unung; Sudarman, Robby; Soeswanto, Bambang; Muhari, Emma Hermawati; Ngatin, Agustinus; Sihombing, Rony Pasonang
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16446

Abstract

Tofu wastewater contains a lot of protein therefore it is easily degraded to produce foul odors and harmful gases due to microbes. Protein levels can be reduced through the electrocoagulation method which is equipped with adsorption. The purpose of this study is to reduce the value of turbidity, TSS, and COD in tofu wastewater due to the influence of voltage in the electrocoagulation process which is equipped with an adsorption process. This research was conducted with an electrocoagulation process at a rate of 250L/min with voltage variations of 15, 20, and 24Volt in a 10L tank containing 3 pairs of aluminum (Al) electrodes connected with direct current. The output water from the electrocoagulation process flows into the settling basin and flows into the adsorption tank containing activated carbon adsorbent. Both of these continuous processes were the innovation of this research. Sampling was conducted every 10 minutes for analysis of turbidity, TSS, COD, and pH. The results of the output water analysis from the electrocoagulation process after passing through the precipitation and adsorption processes show that increasing the voltage results in the decrease of turbidity, TSS, and COD values, however, increased efficiency and pH. Thus, a voltage of 24V with a flow rate of 250mL/min resulted in the highest efficiency of the voltage variations (15, 20, and 24V) with a process time of 90 minutes with a turbidity impurity reduction efficiency value of 45.42% with a value of 41.36 NTU from 75.22NTU, TSS 91.42% with a decrease to 1827mg/L from 21288mg/L, and COD 55.56% with a COD value of 9600mg/L from 21600mg/L, and a process output water pH of 4.91, as well as a reduction in aluminum electrode weight of 1.024grams.
Pengaruh Kondisi Operasi Terhadap Kualitas Aluminium Stearat dalam Reaktor Batch Suminar, Dian Ratna; Lingga Permana, Rezza; Amellia, Yashinta; Ghozali, Mukhtar; Sudarman, Robby; Sihombing, Rony Pasonang
Jurnal Teknik Kimia USU Vol. 15 No. 1 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i1.22678

Abstract

Aluminum stearate has the same potential as aluminum soap as a lubricant additive that can be developed towards standardization of commercial products. The research stages consist of: (1) Making sodium soap through saponification reaction (stearic acid and NaOH), (2) Replacing sodium metal with aluminum metal through trans-saponification reaction, (3) Purifying the product by washing with distilled water, (4) Separation and drying of the product using a Buchner funnel and oven at 100 oC for 3 hours, (5) Analytical test of aluminum stearate product: testing melting point, water content, ash content, free fatty acid content, quantitative content using AAS spectrophotometer, and solubility test. The results of the study showed that aluminum stearate can be made through 2 reaction stages, namely saponification and trans-saponification in the form of a white powder with a melting point of 115.7 oC, ash content of 13.93%, maximum free fatty acid content of 0.9372%, and insoluble in water and chloroform; partially soluble in n-hexane and toluene waste; and soluble in paraffin, methanol, and nitric acid.
Pengaruh Kondisi Operasi Terhadap Kualitas Aluminium Stearat dalam Reaktor Batch Suminar, Dian Ratna; Lingga Permana, Rezza; Amellia, Yashinta; Ghozali, Mukhtar; Sudarman, Robby; Sihombing, Rony Pasonang
Jurnal Teknik Kimia USU Vol. 15 No. 1 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i1.22678

Abstract

Aluminum stearate has the same potential as aluminum soap as a lubricant additive that can be developed towards standardization of commercial products. The research stages consist of: (1) Making sodium soap through saponification reaction (stearic acid and NaOH), (2) Replacing sodium metal with aluminum metal through trans-saponification reaction, (3) Purifying the product by washing with distilled water, (4) Separation and drying of the product using a Buchner funnel and oven at 100 oC for 3 hours, (5) Analytical test of aluminum stearate product: testing melting point, water content, ash content, free fatty acid content, quantitative content using AAS spectrophotometer, and solubility test. The results of the study showed that aluminum stearate can be made through 2 reaction stages, namely saponification and trans-saponification in the form of a white powder with a melting point of 115.7 oC, ash content of 13.93%, maximum free fatty acid content of 0.9372%, and insoluble in water and chloroform; partially soluble in n-hexane and toluene waste; and soluble in paraffin, methanol, and nitric acid.
Co-Authors Abdul Haris Watoni Ahmad Fauzan Ahmad Zaeni, Ahmad Ahmad, La Ode Ajie Nurhasyim Alisya Nurbaits Alwahab Alwahab Amellia, Yashinta Ananda Dea Maharani Apriyanti, Fitri Bambang Soeswanto Budi Mandra Harahap Budi Mandra Harahap Budiastuti, Herawati - Dea Tesalonika Sitorus Dea Tesalonika Sitorus Diana Murti Indra Wahyuni Diana Murti Indra Wahyuni Dianty Rosirda Efniarsi S. Panggalo Evy Nuryah Adha Fania Zulfa Salsabila Fildzah Sajidah Fildzah Sajidah Ghozali, Mukhtar Herawati Budiastuti Husaeni, Yusuf Ahmad Indarti, Retno Istianandar, Muhammad Iqbal Sya'bani Jayanti, Retno Dwi La Ode A. Nur Ramadhan La Ode Ichlas Syahrullah Yunus Lingga Permana, Rezza Melina Melina Muhari, Emma Hermawati Nancy Siti Djenar Ngatin, Agustinus Nurazizah, Annisa Nurcahyo Nurcahyo, Nurcahyo Paramitha, Tifa Permanasari, Ayu Ratna Prihandini, Ghusrina Pullammanappalil, Pratap Ramadhani, Laily Isna Retno Indarti Rifadil, Mochammad Machmud Rosyidah Khoirunnisa Mahdan Sihombing, Rony Pasonang Sudrajat Harris Abdulloh Suminar, Dian Ratna Suryadi, Joko Unung Leoanggraini Wa Ode Novi Haryanti WAHYU WIBISONO Wahyuni, Ninik Lintang Edi Yulistiani, Fitria Yunus Tonapa Sarungu