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KAJIAN AWAL PEMBUATAN PUPUK CAIR ORGANIK DARI EFFLUENT PENGOLAHAN LANJUT LIMBAH CAIR PABRIK KELAPA SAWIT (LCPKS) SKALA PILOT Fristyana Sosanty Lubis, Irvan, Dedy Anwar, Basril Amirza Harahap, Bambang Trisakti
Jurnal Teknik Kimia USU Vol 3, No 1 (2014)
Publisher : Universitas Sumatera Utara

The objective of this study is to design an organic liquid fertilizer manufacturing process from palm oil mill effluent (POME) at pilot scale. Materials used were effluent from further processing of biogas fermentation from POME and starter (mixture of molasses, yeast and effective microorganism). Variables measured were total solid (TS), volatile solid (VS), total suspended solid (TSS), volatile suspended solid (VSS), and chemical oxygen demand (COD), in addition, analysis content of liquid fertilizers was performed. The research consisted of production of starters and fermentation process. Loading rate was started from hydraulic retention time (HRT) 2,500 days and bioreactor performance was observed at HRT 100, 90 and 80 days. The results showed that COD concentration of bioreactor effluent decreased from 8,600 to 1,580 mg/l and from analysis content, liquid fertilizers are composed of nitrogen 0.14%, P2O5 0.05%, K2O 0.07%, MgO 0.01%, CaO 0.001mg/l, C-Organic 0,12%, and C/N Ratio 0.86.

PERBANDINGAN HIDROLISIS GULA AREN DAN GULA PASIR DENGAN KATALIS MATRIKS POLISTIRENA TERIKAT SILANG (CROSSLINK) DEDY ANWAR
JURNAL ILMIAH KOHESI Vol 3 No 3 (2019): JURNAL ILMIAH KOHESI
Publisher : LP2MTBM MAKARIOZ

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Sugar is a carbohydrate that is used as a sweetener in food and drinks. In this study, palm sugar and white sugar were used. Palm sugar is a sugar in the form of brownish crystals, while white sugar is a crystal-shaped sugar white to yellowish white. The purpose of this study was to study the effect of white sugar (sucrose) with palm sugar on the product produced in a fixed bed catalytic reactor. The methodology used in this study is hydrolysis of sucrose to reducing sugars by a continuous method using a fixed-bed reactor. This fixed bed reactor contains a cation resin with a crosslinked polystyrene matrix. The results of the analysis showed that the concentration of glucose products was mostly produced by palm sugar . The glucose concentration in palm sugar 20 g/L and 30 g/L was 3.9852 g/L and 5.1691 g/L, while the glucose concentration in white sugar 20 g/L and 30 g/L was 3.7205 g/L and 4.9485 g/L.

KAJIAN AWAL PEMBUATAN PUPUK CAIR ORGANIK DARI EFFLUENT PENGOLAHAN LANJUT LIMBAH CAIR PABRIK KELAPA SAWIT (LCPKS) SKALA PILOT Fristyana Sosanty Lubis, Irvan; Dedy Anwar; Basril Amirza Harahap; Bambang Trisakti
Jurnal Teknik Kimia USU Vol. 3 No. 1 (2014): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

The objective of this study is to design an organic liquid fertilizer manufacturing process from palm oil mill effluent (POME) at pilot scale. Materials used were effluent from further processing of biogas fermentation from POME and starter (mixture of molasses, yeast and effective microorganism). Variables measured were total solid (TS), volatile solid (VS), total suspended solid (TSS), volatile suspended solid (VSS), and chemical oxygen demand (COD), in addition, analysis content of liquid fertilizers was performed. The research consisted of production of starters and fermentation process. Loading rate was started from hydraulic retention time (HRT) 2,500 days and bioreactor performance was observed at HRT 100, 90 and 80 days. The results showed that COD concentration of bioreactor effluent decreased from 8,600 to 1,580 mg/l and from analysis content, liquid fertilizers are composed of nitrogen 0.14%, P2O5 0.05%, K2O 0.07%, MgO 0.01%, CaO 0.001mg/l, C-Organic 0,12%, and C/N Ratio 0.86.

PEMANFAATAN LIMBAH ORGANIK DAN LIMBAH RUMAH TANGGA DESA NATOLUTALI MENJADI MEDIA TANAM DAN KOMPOS MENGGUNAKAN KOMPOSTER MENARA Dedy Anwar Anwar; Goeroe Simatupang; Pahotan D.P. Silaen; Meiyer Marthen Kinda; Ellyas Alga Nainggolan
Prosiding Seminar Nasional Pengabdian Kepada Masyarakat Vol 2 (2021): PROSIDING SEMINAR NASIONAL PENGABDIAN KEPADA MASYARAKAT - SNPPM2021
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Negeri Jakarta

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Abstrak Tujuan dari pengabdian ini adalah mengedukasi masyarakat khususnya masyarakat Desa Natolutali untuk memanfaatkan limbah organik pertanian dan limbah rumah tangga menjadi media tanam dan kompos menggunakan komposter menara. Pengomposan atau pembuatan pupuk organik merupakan suatu metode untuk mengkonversikan bahan-bahan organik kompleks menjadi bahan yang lebih sederhana dengan menggunakan aktivitas mikroba. Media tanam termasuk ke dalam kategori bahan organik yang akan mengalami proses pelapukan atau dekomposisi yang dilakukan oleh mikroorganisme. Melalui proses tersebut, akan dihasilkan karbon dioksida, air dan mineral yang merupakan sumber unsur hara yang dapat diserap tanaman sebagai zat makanan. Sehingga edukasi pemanfaatan limbah organik menjadi media tanam dan kompos kepada masyarakat sangat optimal untuk meningkatkan produktivitas pertanian dan mengurangi pencemaran lingkungan akibat limbah. Metode pendekatan untuk pelaksanaan kegiatan pengabdian untuk masyarakat ini yaitu dengan metode sosialisasi, diskusi dan workshop (pelatihan). Berdasarkan kegiatan pengabdian masyarakat yang dilakukan di Desa Natolutali diperoleh kesimpulan bahwa masyarakat merasa terbantu dengan mendapatkan edukasi dan pelatihan yang meningkatkan produktivitas pertanian mereka. Abstract The purpose of this dedication was to educate the community, especially the people of Natolutali Village to utilize agricultural organic waste and household waste into planting media and compost using a tower composter. Composting or making organic fertilizer is a method for converting complex organic materials into simpler materials using microbial activity. Planting media is included in the category of organic matter that will undergo a weathering or decomposition process carried out by microorganisms. Through this process, carbon dioxide, water, and minerals will be produced which are sources of nutrients that can be absorbed by plants as food substances. So that education on the use of organic waste as planting media and compost to the community is optimal for increasing agricultural productivity and reducing environmental pollution due to waste. The approach method for implementing community service activities was the method of socialization, discussion and workshop (training). Based on community service activities carried out in Natolutali Village, it was concluded that the community felt helped by getting education and training that increased their agricultural productivity.

Lecturers’ checklist instrument to monitor students’ understanding in distance learning Sari Muthia Silalahi; Dedy Anwar; Juli Yanti Damanik
Journal of Education and Learning (EduLearn) Vol 16, No 4: November 2022
Publisher : Intelektual Pustaka Media Utama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/edulearn.v16i4.20485

This paper aimed at exploring the results of participant self monitoring using a checklist instrument in distance learning with flipped classroom setting. The participants were 11 lecturers of Bioprocess Engineering Study Program at Institut Teknologi Del (IT Del), Indonesia. The objective of the checklist instrument was for the lecturers to monitor their students’ understanding about the lessons given each week. The data generated from the instrument was analysed descriptively. The results found that pre-class, in-class and out-class are important parts of learning in flipped classroom setting. The data showed that 56% of students achieved good understading of the knowledge taught by their lecturers. The same idea as in-class, attendance checking and interaction between students and lecturers had a key factor in the learning process. It was found that students’ understanding increased by 20% (very good), 62% (good) and 18% (moderate) through questions and answers, discussions, and tests at the end of class. Those were the modes of interactions that had been done in class. In line with an out-class checklist, giving assignments and feedback could improve students understanding into the level of very good (61%), good (27%) and sufficient (10%). with using a checklist tool, participants in this study self-monitored their progress in a flipped classroom while taking distance learning courses online to improve the quality of their class.

OPTIMASI KONDISI BLANSIR TERHADAP WHITENESS INDEX TEPUNG UMBI KAYU MENGGUNAKAN RESPONSE SURFACE METHODOLOGY (RSM Ellyas Alga Nainggolan; Dedy Amwar
Fruitset Sains : Jurnal Pertanian Agroteknologi Vol. 10 No. 6 (2023): February: Ilmu Pertanian
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/fruitset.v10i6.3344

Ubi kayu (Manihot esculenta) merupakan salah satu komoditas tanaman pangan sumber karbohidrat yang paling banyak dikonsumsi secara global. Penangan pasca panen pada ubi kayu penting untuk mengurangi kerusakan yang disebut sebagai postharvest physiological deterioration (PPD). Blansir merupakan salah satu pretreatment yang dapat diterapkan untuk menginaktifasi enzim oksidatif. Tujuan penelitian ini adalah untuk mengetahui suhu dan waktu yang optimum terhadap whines index (WI) tepung ubi kayu dengan menggunakan Response Surface Methodology (RSM). Software Design-Expert 13.0.5.0 digunakan dalam mendesain percobaan menggunakan RSM melalui Central Composite Design (CCD) serta diperoleh 13 konfigurasi suhu dan lama waktu blansir pada tepung ubi kayu dengan respon WI. Berdasarkan hasil penelitian, kondisi optimum blansir terdapat pada suhu 79.4o C dengan waktu 5.92 menit. Konfigurasi suhu dan waktu blansir yang optimum tersebut menghasilkan karakteristik tepung ubi kayu dengan nilai WI sebesar 83,87 dan 84,12 untuk nilai prediksi dan aktual secara berurutan.

Thermophilic Digestion of Palm Oil Mill Effluent: Enhancing Biogas Production and Mitigating Greenhouse Gas Emissions Anwar, Dedy; Simanjuntak, Evy Enjelina; Sitepu, Ivana; Kinda, Meiyer Marthen; Nainggolan, Ellyas Alga; Wibowo, Yudha Gusti
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 21, No 3 (2024): November 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v21i3.734-746

This study investigates the impact of thermophilic anaerobic digestion on biogas production and methane emission reduction from Palm Oil Mill Effluent (POME). Conducted under controlled conditions at 55°C and 65°C, the research aims to optimize biogas yield and reduce Chemical Oxygen Demand (COD) levels. The findings indicate that thermophilic digestion at 65°C significantly enhances biogas production, yielding 1.81 L Biogas per liter of POME over an 8-day period, compared to mesophilic conditions. Furthermore, the study demonstrates substantial COD reduction, supporting a more efficient and environmentally friendly process. By capturing methane emissions and converting them into a renewable energy source, this method aligns with global climate policies and greenhouse gas reduction targets. The integration of thermophilic anaerobic digestion into POME treatment presents a viable solution for the palm oil industry to improve waste management practices and contribute to sustainable development goals. Future research should explore large-scale implementations to maximize the environmental and economic benefits of this technology.

The Potential of Spent Bleaching Earth In Charcoal Briquettes as Energy Source Tarigan, Enda Rasilta; Mirnandaulia, Meutia; Mustakim, Mustakim; Sitinjak, Anna Angela; Purba, Darry Christine Silowaty; Karo-Karo, Justaman Arifin; Silalahi, Meriahni; Fitri, Li Idi'il; Anwar, Dedy
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 2 (2025): July 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i2.380-392

Eco-friendly alternative fuels encourage the use of waste biomass as a material for making briquettes. This study aimed to develop briquettes from rice husk biomass and peat moss and add spent leaching earth (SBE). SBE is a hazardous and toxic waste increasingly piling up in landfills. The research method involved carbonizing rice husks and peat moss, mixing them with SBE, molding with a 200 kg/cm2 Hydraulic Press, and drying. The resulting briquettes had an average water content of 5.86% and an ash content of 2.18%, which meet the SNI No. 01/6235/2000 standard. Morphological analysis revealed that the briquettes were round but exhibited non-homogeneous aggregation. The highest calorific value was found in C4 briquettes of 5030.17 cal/gr. The composition of C4 was 40% rice husk charcoal (4.8 g), 45% peat (5.4 g), and 15% SBE (1.8 g), with SBE dried for seven days. The addition of peat increased the calorific value of the briquettes. Based on scanning electron microscopy (SEM)/ energy-dispersive X-ray (EDX) analysis, the carbon content in the C4 briquettes reached 72.2%. This study shows that the combination of rice husk charcoal, SBE, and peat provides a renewable energy source and contributes to the reduction of environmental waste, thereby promoting sustainability.

PENGURANGAN KADAR KARBONDIOKSIDA (CO2) DALAM BIOGAS DENGAN BIOFIKSASI MIKROALGA Chlorella vulgaris DAN Scenedesmus obliquus Anwar, Dedy; Panjaitan, Pestahariati; Situmorang, Ester Rina; Mirnandaulia, Meutia; Meldha, Zuqni
CHEMTAG Journal of Chemical Engineering Vol 4, No 2 (2023): CHEMTAG Journal of Chemical Engineering
Publisher : Universitas 17 Agustus 1945 (UNTAG) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/cjce.v4i2.4432

Biogas memiliki kandungan utama metana (CH4) sebesar 55-70% dan karbondioksida (CO2) sebesar 25-50%. Kadar CO2 yang tinggi dalam biogas dapat mengurangi nilai bakarnya. Salah satu teknik pengurangan kadar CO2 dalam biogas yaitu dengan biofiksasi menggunakan mikroalga. Biofiksasi merupakan penyerapan CO2 melalui proses fotosintesis. Tujuan penelitian ini adalah mengetahui tingkat penurunan kadar CO2 melalui biofiksasi menggunakan mikroalga, mengetahui pengaruh laju alir biogas dan jenis mikroalga terhadap penyerapan kadar CO2 dan mengetahui laju pertumbuhan mikroalga dalam proses biofiksasi untuk mengurangi kadar CO2 dalam biogas. Bahan baku yang digunakan dalam produksi biogas adalah eceng gondok dan kotoran sapi. Variasi laju alir biogas yang digunakan sebagai variabel pada proses pengurangan kadar CO2 oleh mikroalga ditentukan dari biogas yang terproduksi yaitu laju alir maksimum 6,85 mL/jam dan dua kali laju alir maksimum 13,7 mL/jam. Mikroalga yang digunakan yaitu Chlorella vulgaris dan Scenedesmus obliquus. Parameter yang diamati adalah kadar CO2 dalam biogas sebelum dan setelah biofiksasi, serta laju alir biogas. Pengurangan kadar CO2 dilakukan melalui tiga tahap, dimana penggunaan Scenedesmus obliquus memberikan hasil yang lebih tinggi dibandingkan dengan Chlorella vulgaris. Hasil pengurangan kadar CO2 dengan laju alir dua kali maksimum yaitu sebesar 68,8% oleh Scenedesmus obliquus dan sebesar 49% oleh Chlorella vulgaris.

Sustainable Valorization of Used Biochar for Hexavalent Chromium Removal from Wastewater and Soil Fertility Enhancement Anwar, Dedy; Neliyati, Neliyati; Gusniwati, Gusniwati; Jasminarni, Jasminarni; Rohman, Arif; Syarifuddin, Hutwan; Nainggolan, Ellyas Alga; Wibowo, Yudha Gusti
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 3 (2025): November 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i3.723-750

Environmental pollution from wastewater and soil contamination remains a critical global concern, with current treatment methods often facing limitations in scalability, cost, or environmental safety. Biochar, a carbon-rich material derived from biomass pyrolysis, has emerged as a sustainable adsorbent for heavy metals and organic pollutants. While its use in environmental remediation is well-established, the fate and reuse of spent biochar have received limited attention. This comprehensive review explores the untapped potential of used biochar, particularly for the removal of hexavalent chromium (Cr(VI)) from wastewater and its role in enhancing soil fertility. We critically analyze current practices, mechanisms of Cr(VI) removal using spent biochar, regeneration techniques, and field applications, while highlighting circular economy frameworks that promote resource efficiency. The study integrates empirical evidence from recent case studies and offers policy recommendations to support large-scale implementation. This work is the first to provide an integrative review of the reuse of spent biochar with a dual focus on wastewater treatment and soil enhancement, underpinned by a circular economy perspective. It addresses critical research gaps by evaluating regeneration techniques, post-use functionality, and practical field applications, thereby positioning spent biochar as a viable, low-cost, and eco-friendly alternative in environmental management systems.

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