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All Journal 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 dan Lingkungan Serambi Engineering 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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Pertumbuhan Akar Anggrek Bulan Melalui Sistem Tanam Hidroponik dalam Smart and Aesthetic Greenhouse Ayu Ratna Permanasari; Harita Nurwahyu Chamidy; Robby Sudarman; Dianty Rosirda; Mochammad Machmud Rifadil; Wahyu Wibisono
Jurnal Serambi Engineering Vol. 9 No. 4 (2024): Oktober 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Hydroponic orchid (Phalaenopsis) growing is a modern agricultural technique that is growing in popularity due to its ability to produce high quality orchid plants with efficient use of resources. Hydroponics is an agricultural method that does not use soil media, but rather nutrient solutions specially formulated to meet the nutritional needs of plants. In orchid cultivation, hydroponics offers several advantages, including more precise nutrient control, a more sterile growing environment, and a reduced risk of soil-borne pests and diseases. The aim of this study was to investigate the effectiveness of the hydroponic method in orchid cultivation, focusing on vegetative growth, flower quality and the efficiency of water and nutrient use. The results of the study showed that orchids grown hydroponically had faster growth and better flower quality compared to conventional methods. The average growth of orchid roots in the aquaponic system was 2mm per week and the growth of orchid roots without hydroponics was approximately 1.3mm per week.
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.
Co-Authors Abdul Haris Watoni Ahmad Fauzan Ahmad Zaeni, Ahmad Ahmad, La Ode Ajie Nurhasyim Alisya Nurbaits Alwahab Alwahab 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 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 Melina Melina Muhari, Emma Hermawati Nancy Siti Djenar Ngatin, Agustinus Ninik Lintang Edi Wahyuni 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 Suryadi, Joko Unung Leoanggraini Wa Ode Novi Haryanti WAHYU WIBISONO Yulistiani, Fitria Yunus Tonapa Sarungu