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All Journal TEKNIK Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Ilmu Lingkungan Jurnal Sains & Teknologi Lingkungan Jurnal Teknik Mesin Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi
Mochtar Hadiwidodo
Environmental Engineering Department Diponegoro University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Waste Collection and Transport Optimization of Pemalang District Service Area, Pemalang Regency Adranandini Noor Anisa; Mochtar Hadiwidodo; Sudarno Sudarno; Sri Sumiyati
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 19, No 3 (2022): November 2022
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v19i3.687-700

Abstract

This study was prepared with the aim to plan the optimum transportation system in Pemalang sub-district based on traffic conditions in accordance with the desired target. The method used in this planning uses GIS-based applications, namely network analyst and google map. The operational cost of the vehicle in this planning is calculated by the PCI (Pacific Consultant International) method. Based on existing conditions, the operational costs of vehicles incurred reached Rp2,361,445,231.21 while in optimization conditions the operational costs incurred became more efficient at Rp2,913,093,684.31. The optimum time of transportation is done at 05.00 – 12.00 to avoid peak traffic hours at 13.00 – 17.00 with a vehicle travel speed of 47.42 km/h. Addition of freight after optimization so that it becomes 50 freight/day and the addition of containers to 9 containers. It was obtained for 2021 - 2025 as many as 17 containers as well as the addition of freight as many as 15 freight, and 6 fleets of armroll truck carriers.
Optimizing Nutrient Removal in Agriculture Wastewater Using Electrocoagulation Technology Oktiawan, Wiharyanto; Sarminingsih, Anik; Hadiwidodo, Mochtar; Purwono, Purwono
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.v22i3.1028-1038

Abstract

Water pollution exacerbates global water crises by reducing freshwater availability and quality. Agricultural wastewater, containing pesticides, herbicides, fertilizers, and organic matter, can contaminate water bodies if untreated. This study optimizes electrocoagulation (EC) parameters—voltage, time, and calcium concentration—to maximize nitrogen compound removal using response surface methodology (RSM). Results show a nitrate reduction of 88.37% (2.960 mg/L) at 45 V, 15 minutes, and 7 mg/L calcium, while ammonia was reduced by 99.37% (0.016 mg/L) at 30 V, 1.5 minutes, and 4.5 mg/L calcium. Calcium enhances coagulation by forming calcium hydroxide. The optimal conditions for nitrate and ammonia removal (3.709 mg/L and 1.338 mg/L) were 45 V, 15 minutes, and 5.09 mg/L calcium. EC also removed 96.73% of iron, with magnesium concentrations remaining very low (0.001 mg/L).
Co-Authors Adranandini Noor Anisa Ainurrofiq, Mohammad Naffah Anik Sarminingsih Anik Sarminingsih, Anik Ari Wibawa Budi Santosa Arya Rezagama Atiya Nurul Jusihdani, Atiya Nurul Baskoro Lokahita Budi Prasetyo Samadikun Cagayana Cagayana Dian Asri Puspa Ratna, Dian Asri Puspa Dwi Siwi Handayani Endro Sutrisno Fachrian Aji, Fachrian Febiani Dwi Utari Febriani, Masyitha Putri Ganjar Samudro Ganjar Samudro Haryono Setiyo Huboyo Haryono Setyo Huboyo Ika Bagus Priyambada Indah Sekar Arumdani Indrasarimmawati Indrasarimmawati Irawan Wisnu Wardhana Irawan Wisnu Wardhana Irawan Wisnu Wardhana Irawan Wisnu Wardhana Irma Natasya Hutabarat Isaaf Fadhilah Lucy Amena Sembiring Mia Yustika, Mia Mochamad Arief Budihardjo Mohamad Djaeni Natasya Ghinna Humaira Nur Fajri Arifiani, Nur Fajri Nurandani Hardyanti Nurul Fajri Ramadhani, Nurul Fajri Pertiwi Andarani Prabowo, Zuhda Nur Prihanita Ratih Fitriandani Purwono Purwono, Purwono Rahmawati, Fauziyah Ramadan, Bimastyaji Surya Ratna Kustanti Rizki Tri Andrianingsih Sabrina, Azzura Saraswati, Lutfi Sindi Martina Hastuti, Sindi Martina Sri Sumiyati Sudarno Sudarno Syafrudin Syafrudin Syafrudin Syafrudin Syafrudin Syafrudin Tika Ayu Kusuma Wardani Vaneza Citra Kurnia, Vaneza Citra Wiharyanto Oktiawan