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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Syntax Literate: Jurnal Ilmiah Indonesia Makara Journal of Technology Journal Research of Social Science, Economics, and Management
Lokahita, Baskoro
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Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Current Status of Hydrothermal Treatment for Energy and Material Recovery Toward a Sustainable Post-consumer Material Cycle Lokahita, Baskoro; Aziz, Muhammad; Takahashi, Fumitake
Makara Journal of Technology Vol. 24, No. 1
Publisher : UI Scholars Hub

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Abstract

The demand for energy-efficient and environmentally friendly municipal solid waste (MSW) processing has increased in developing countries. The thermochemical process offers a fast and reliable solution to reutilize or reduce the volume of MSW. Hydrothermal treatment is a novel MSW treatment technology that is compatible with high-moisture-content feedstock. It involves the thermal degradation of MSW in pressurized water or steam, which promotes the disintegration of cellulosic and polymer materials. Recent advances have shown effective MSW conversion into homogenous solid hydrochar with higher energy density. Alkali and chlorine content, which causes issues in combustors, was successfully removed due to the washing effect of hydrothermal treatment. The possibility of activated carbon production also exists because the surface area is significantly increased after the treatment. This paper presents an overview of the latest development of hydrothermal treatment in the field of post-consumer waste and MSW treatment, with particular focus on the operating conditions and physicochemical characteristics of the hydrochar. Several experimental results from post-consumer waste feedstock were compiled and interpreted using principal component analysis to observe the effect of different operating conditions and feedstock during the hydrothermal process.
Model-Based Assessment of Heavy Metals Leaching Behavior in Wasted Activated Sludge Utilization Maulidiany, Nopa Dwi; Oktovidonna, Sabina Adwina; Rastandi, Jessica Dorothea; Lokahita, Baskoro; Abdillah, Ayik
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 1 (2025): March 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i1.143-156

Abstract

Advanced sludge treatment remains a critical challenge as global wastewater production increases, with waste-activated sludge (WAS) posing ecological and health risks due to heavy metal accumulation. This study characterized WAS based on solid parameters and metal content, focusing on As, Cd, Cr, Cu, Fe, Pb, Ni, Mg, Mn, and Zn, which exceed organic fertilizer thresholds. Using Visual MINTEQ, heavy metal leaching behavior was modelled under pH-independent and pH-dependent conditions. The pH-independent simulation identified As as the least leachable metal (2.166 × 10⁻¹³ mgAs/L) and Cu as the most leachable (1.261 × 10⁻⁴ mgCu/L). The pH-dependent simulation (pH 1.5–13.5) revealed significant leaching for Fe (21.777 mgFe/L) and Cu (1.98 ×10-3 mgCu/L), with Ni (0.120 mgNi/L) and Pb (2.7 × 10-4 mgPb/L) posing chronic risks to aquatic ecosystems. Metals like Cr, Cd, and Ni exhibited distinct leaching patterns influenced by pH and WAS composition. The findings highlight the critical role of pH, along with WAS composition, in governing heavy metal leaching, providing insights to mitigate risks and support sustainable sludge management practices.
Improving The Efficiency of Ups Performance in Depok City Lokahita, Baskoro; Effendi, Aisyia Prasetya; Firdaus, Hana Syarifah; Wahyuningsih, Ni Putu Sri
Journal Research of Social Science, Economics, and Management Vol. 4 No. 11 (2025): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i11.869

Abstract

The problem of waste in urban areas such as Depok City requires effective and efficient management solutions to reduce the burden on the final processing site (TPA). The Waste Management Unit (UPS) is one of the strategies of the Depok City Government in handling region-based domestic waste. This study aims to evaluate the technical performance of UPS operating in several locations in Depok City, as well as identify potential for improvement in processing efficiency. The mixed-methods approach is used through the collection of primary and secondary data. Quantitatively, load count analysis and daily mass balance were carried out to analyze the flow of material from input to compost output. Qualitatively, direct observation, semi-structural interviews, and work system studies were carried out. Case studies on three UPS (Jalan Jawa, Sukatani, and Merdeka 1) showed that the proportion of organic waste dominated (more than 94%) with a decrease in mass of up to 74% after the composting process. Nevertheless, the efficiency of the process varies depending on the sorting mechanism, available equipment, and human resource capacity. The results of the analysis show that UPS's performance has not been fully optimal in reducing the burden of waste to the landfill. This study recommends improving operational management, strengthening institutions, and integrating community roles to achieve a sustainable regional waste management system.
Identifikasi Dan Analisis Bottleneck Pengelolaan Sampah Di Tempat Pengolahan Sampah Terpadu (Tpst) Sentiong Menggunakan Metode Analytical Hierarchy Process(Ahp) Umam, Sirajul; Lokahita, Baskoro
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i8.61071

Abstract

Tempat Pengolahan Sampah Terpadu (TPST) Sentiong didirikan sebagai upaya untuk mengurangi volume sampah yang dikirim ke Tempat Pembuangan Akhir (TPA) Sarimukti Bandung, yang saat ini telah mengalami kondisi overload. Namun, pengelolaan sampah di TPST Sentiong masih belum berjalan optimal. Penelitian ini bertujuan untuk mengidentifikasi penyebab utama kendala operasional pengelolaan sampah di TPST Sentiong kurang optimal. Dengan menggunakan metode Analytical Hierarchy Process (AHP), penelitian ini mengevaluasi berbagai aspek yang memengaruhi pengelolaan sampah di TPST Sentiong. Hasil analisis menunjukkan bahwa bottleneck utama terletak pada aspek teknis dengan bobot 0,5579, sementara indeks konsistensi (CI) sebesar 0,0395 dan rasio konsistensi (CR) sebesar 0,0444, menunjukkan bahwa perhitungan matriks telah konsisten. Oleh karena itu, perlu dilakukan perawatan dan pemeliharaan mesin secara teratur untuk mengurangi frekuensi mesin trouble dan meningkatkan efisiensi pengeloaan sampah.
Co-Authors Abdillah, Ayik Effendi, Aisyia Prasetya Firdaus, Hana Syarifah Maulidiany, Nopa Dwi Muhammad Aziz Oktovidonna, Sabina Adwina Rastandi, Jessica Dorothea Takahashi, Fumitake Umam, Sirajul Wahyuningsih, Ni Putu Sri