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PENGARUH KOMPOSISI PEMBUATAN BIOBRIKET DARI CAMPURAN SERBUK GERGAJI, KULIT SINGKONG DAN BATUBARA TERHADAP NILAI PEMBAKARAN rendana, muhammad; Rosdiana Moeksin; Adi Kunchoro; Rengga Ulil Ambri Zecy
Jurnal Teknik Kimia Vol 21 No 4 (2015): Jurnal Teknik Kimia
Publisher : Chemical Engineering Department, Faculty of Engineering, Universitas Sriwijaya

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Penduduk Indonesia setiap tahun mengalami pertumbuhan yang sangat pesat. Denganmeningkatnya pertumbuhan tersebut, maka semakin banyak pula sumber energi yang digunakan. Olehkarena itu, perlu ditemukannya energi alternatif baru untuk mengatasi hal tersebut. Salah satunya yaitudengan pemanfaatan campuran limbah kulit singkong dan serbuk untuk membuat biobriket.Padapenelitian ini, biobriket dibuat dengan pencampuran bahan baku antara Kulit Ubi Kayu dan SerbukGergaji dengan komposisi : 90 KUK : 10 SG ; 85 KUK : 15 SG ; 80 KUK : 20 SG ; 75 KUK : 25 SG ; 70KUK : 30 SG ; 30 KUK : 70 SG ; 25 KUK : 75 SG ; 20 KUK : 80 SG ; 15 KUK : 85 SG ; 10 KUK : 90SG.Pencampuran biobriket menggunakan perekat tepung tapioka sebanyak 10% dari berat biobriketdengan temperatur karbonisasi untuk kulit ubi kayu sebesar 300oC dan untuk serbuk gergaji sebesar500oC. Berdasarkan hasil analisa biobriket didapatkan semakin banyak komposisi bahan baku serbukgergaji maka akan menghasilkan nilai kalor yang tinggi. Kondisi optimum didapatkan pada sampeldengan komposisi 10 KUK : 90 SG dengan nilai kalor sebesar 5775 cal/gr.

Rubber bark dust-zeolite composite improved mechanic strength of soft paddy soil through improved microstructure Rendana, Muhammad; Idris, Wan Mohd Razi; Abdul Rahim, Sahibin; Ali Rahman, Zulfahmi; Lihan, Tukimat
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 18, No 2 (2021): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v18i2.56345

Soft paddy soils are not a stable soil structure that leads to the decline of rice production in Kedah, Malaysia. The soil had high compressibility and water content, and low soil strength thus the agricultural machines could not be operated above this soil. Therefore, this study was conducted to improve the mechanical strength of soft soils in paddy fields using an organic amendment. The organic amendment used in this study was made from amended materials comprising clinoptilolite, kieserite, humic acid, and rubber bark dust. The study was carried out in the paddy field area of Alor Pudak district, Kedah, Malaysia, and it was divided into five treatments of amendment dose, i.e: 0 kg (control or P0), 125 kg (P1), 250 kg (P2), 375 kg (P3) and 500 kg (P4) with each plot size about 0.20 ha. The soil samples were then analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), and the unconsolidated undrained triaxial compression test (UU-test) to characterize their amended properties. The XRD results clearly exhibited changes in the mineralogical composition of all treated plots with an increasing smectite content (1200 to 1300 intensity). Furthermore, the SEM results showed that clay particles in the treated plots have been flocculated to form close-knit, more stable soil structures. After the organic amendment application, the mechanical strength of the treated plots increased to an optimum level (50 kPa in P2) for resisting mechanical pressure from agricultural machinery. Overall, this study of the efficacy of organic amendment offers new insight into a soft paddy soil remediation method that is more effective and economical than the conventional method.

Trophic Status Monitoring for the Bangka Strait in Indonesia during the COVID-19 Period Using MODIS Data Susanti, Susi; Rendana, Muhammad; Novia, Novia; Bahrin, David
Indonesian Journal of Environmental Management and Sustainability Vol. 8 No. 3 (2024): September
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2024.8.3.110-117

Many surface waters in the world are impounded by eutrophication due to the global warming phenomenon. This study analyzed the trophic level in the Bangka Strait, a busy pathway that connects two provinces (Bangka and South Sumatra) of Indonesia, using MODIS-Terra chlorophyll-a (Chl-a) data from the 2020 year. We applied the GIS analysis to generate Chl-a concentration and trophic state maps over the study area. The results of the study revealed that the mesotrophic, eutrophic, and oligotrophic status encompass 50%, 43%, and 7% of the Bangka Strait region, respectively. The highest concentration of Chl-a was observed in May (5.38 g/L), while the lowest was observed in September (3.02 g/L). Our study revealed that the high Chl-a concentration was primarily due to nutrient contributions from South Sumatra rivers. On the other hand, the COVID-19 restriction policy significantly reduced Chl-a from July to October. The trophic state of the Bangka Strait was at a mesotrophic level, and the major contributors to the trophic condition in the strait came from the coasts of South Sumatra, which mostly consisted of agricultural and aquacultural activities. These findings will be useful in developing an effective policy for monitoring and protecting surface waters from eutrophication events.

Textile wastewater treatment using Moringa oleifera seeds: optimization via polyacrylamide combination Rendana, Muhammad; Renaldi, Fadhlurrahman; Akbar, M. Naufal; Susanti, Susi; Hardestyariki, Dwi
Sriwijaya Journal of Environment Vol 10, No 1 (2025): Environmental Impacts
Publisher : Program Pascasarjana Universitas Sriwijaya

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Moringa oleifera (MO) seeds have a protein with positive charges which act as cationic polyelectrolyte and active substances; rhamnosyloxy benzyl isothiocyanate. These substances are useful to reduce and adsorb pollutants and dyes in textile wastewaters. However, the use of MO seeds as a coagulant is inadequate to improve the wastewater quality. Therefore, in this study, the coagulation performance was improved by the addition of anionic polyarcylamide (PAM). Results revealed that the combination of MO+PAM showed a better performance than MO only. The removal efficiency of wastewater parameters enhanced to 88.83%, 80.58%, 19.90%, and 5.86% for dye, TSS, BOD, and COD, respectively. The addition of PAM in MO coagulant also assisted in reducing the settling time significantly (30 min). Furthermore, SEM images proved that dye solid and MO seeds combine to create clumps or flocs. Then, dye substances were drawn or trapped by the porous nature of the charge-containing MO seeds. As a whole, the use of MO+PAM give a new notion in treating textile wastewater quality.

The Impact of COVID-19 Pandemic on Gross Regional Domestic Product Growth and Tropospheric Nitrogen Dioxide Pollution in South Sumatra Province, Indonesia Rendana, Muhammad; Faizal, Muhammad; Said, Muhammad; Komariah, Leily Nurul; Izzudin, Muhammad
Journal of Environmental and Science Education Vol. 4 No. 1 (2024): Journal of Environmental and Science Education : April 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jese.v4i1.453

The objective of the study was to examine the spatial and temporal variation of the tropospheric NO2 column compared with the economic growth during the COVID-19 pandemic. Therefore, the satellite based tropospheric NO2 was acquired from the Aura Satellite during 2019-2021 over the South Sumatra region of Indonesia. The GIS analysis was conducted to produce the quarterly tropospheric NO2 map over the study area. In this study, the gross regional domestic product (GRDP) was used as a benchmark for economic growth. The GRDP would relate to the air pollution to identify possible anthropogenically induced NO2 pollution. The result indicated the GRDP growth significantly decreased when the tropospheric NO2 concentration experienced a great reduction during 2020 (Quarters III-IV). The economic growth reduced from 5.79 to -1.58 during 2019-2020. It was noted that during the decline in GRDP, the variation of tropospheric NO2 was decreased by about 33%.

Green the Islamic boarding school: Eco enzyme training for organic waste management Rendana, Muhammad; Susanti, Susi; Yandriani, Yandriani; Jati, Stevanus Nalendra; Renaldi, Fadhlurrahman; Akbar, M. Naufal
Community Empowerment Vol 10 No 4 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.13150

The issue of organic waste, which predominantly originates from households and is also generated by educational institutions such as schools, has the potential to cause environmental impacts if not managed properly. Organic waste holds significant potential to be processed into eco enzyme, which has various benefits. Recognizing this potential, this community service program aimed to empower the community at Pondok Pesantren At Tauhiid, Indralaya, South Sumatra, through eco enzyme production training. The methodology employed in this activity included lectures and direct practical training. The program results indicated a 60% increase in understanding regarding eco enzyme production after participating in the training, which utilized leftover fruit and vegetable waste. This program is expected to serve as a community empowerment model for independent organic waste management, particularly within educational institution environments.

Trans-esterification of pangansius hypolatamus tallow waste with ethanol by electrolysis process and KO0H as catalyst Afrah, Bazlina Dawami; Rendana, Muhammad; Pratama, Muhammad Yori; Putri, Tiara Maharani Ramona; Rahmadianti, Nurulia; Sabrina, Dina
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.20859

Consumption of fuel energy continues to increase every year. Still, the fuel used today is almost entirely derived from fossil materials that are toxic to the environment and not renewable, so they need renewability to be guaranteed. One solution to this problem is ethyl ester based on catfish (Pangasius Hypothalamus) tallow waste. The catfish fish tallow is extracted first and then in a liquid phase and then reacted with the help of a KOH catalyst (1%; 1.5%; 2%) by electrolysis method using copper electrodes with a transesterification reaction. The research was conducted on the ratio of raw materials to ethanol of 1:5, 1:6, and 1:7 with a power supply voltage of 20V. It can be seen from the research results that the mole ratio of raw material and ethanol at 1:6 produces ethyl esters with a tendency to be of better quality. The best ethyl ester yield was obtained at a ratio of 1:6 raw material and 1.5% catalyst amount, and the resulting yield was 92.4058%.

Textile wastewater treatment using Moringa oleifera seeds: optimization via polyacrylamide combination Rendana, Muhammad; Renaldi, Fadhlurrahman; Akbar, M. Naufal; Susanti, Susi; Hardestyariki, Dwi
Sriwijaya Journal of Environment Vol 10, No 1 (2025): Environmental Impacts
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22135/sje.2025.10.1.22-26

Moringa oleifera (MO) seeds have a protein with positive charges which act as cationic polyelectrolyte and active substances; rhamnosyloxy benzyl isothiocyanate. These substances are useful to reduce and adsorb pollutants and dyes in textile wastewaters. However, the use of MO seeds as a coagulant is inadequate to improve the wastewater quality. Therefore, in this study, the coagulation performance was improved by the addition of anionic polyarcylamide (PAM). Results revealed that the combination of MO+PAM showed a better performance than MO only. The removal efficiency of wastewater parameters enhanced to 88.83%, 80.58%, 19.90%, and 5.86% for dye, TSS, BOD, and COD, respectively. The addition of PAM in MO coagulant also assisted in reducing the settling time significantly (30 min). Furthermore, SEM images proved that dye solid and MO seeds combine to create clumps or flocs. Then, dye substances were drawn or trapped by the porous nature of the charge-containing MO seeds. As a whole, the use of MO+PAM give a new notion in treating textile wastewater quality.

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