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All Journal 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 Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Potensi Sampah Combustible pada Zona Aktif 1 TPA Jatibarang Semarang sebagai Bahan Baku RDF (Refuse Derived Fuel) Rizki Tri Andrianingsih; Ganjar Samudro; M. Arief Budihardjo; Baskoro Lokahita; Syafrudin Syafrudin; Mochtar Hadiwidodo; Irawan Wisnu Wardhana
Jurnal Teknik Mesin Vol 7, No 1 (2018)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v7i1.2239

Abstract

Banyaknya produksi sampah di Semarang menyebabkan timbulan sampah di TPA Jatibarang semakin meningkat. Untuk mengurangi timbulan sampah, perlu adanya energi alternatif. Oleh karena itu, produksi refuse derived fuel (RDF) dapat menjadi salah satu solusi positif dalam penyelesaian masalah ini. Pemanfaatan energi dari limbah dikenal sebagai Waste-to-Energy (WTE). Pemanfaatan limbah menjadi energi sangat berhubungan dengan nilai kalor. Pada kajian ini, sampah combustible dari zona aktif 1 TPA Jatibarang akan dihitung nilai kalor tingginya dengan bom kalorimeter. Sampah diambil pada kedalaman 0-1 m, 1-2 m, dan 2-3 m di bawah permukaan timbulan sampah. Nilai kalor yang dihasilkan sampel tersebut sebesar 6,07 kkal/ton pada kedalaman 0-1 m, 5,56 kkal/ton pada kedalaman 1-2 m dan 5,55 kkal/ton pada kedalaman 2-3 m. Hal ini menunjukkan bahwa semakin tinggi kedalaman maka semakin tinggi pula nilai kalornya, sehingga sampah zona aktif 1 TPA Jatibarang memiliki potensi yang tinggi untuk diolah menjadi RDF.
Tinjauan Nilai Manfaat pada Pengelolaan Sampah Plastik Oleh Sektor Informal (Studi Kasus: Kecamatan Purwodadi, Kabupaten Grobogan) Ratna Kustanti; Arya Rezagama; Bimastyaji Surya Ramadan; Sri Sumiyati; Budi Prasetyo Samadikun; Mochtar Hadiwidodo
Jurnal Ilmu Lingkungan Vol 18, No 3 (2020): November 2020
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.18.3.495-502

Abstract

Penggunaan kembali material limbah dengan cara mendaur ulang merupakan salah satu cara efektif untuk menghindari pencemaran lingkungan dan mengurangi volume timbulannya di Tempat Pembuangan Akhir. Penelitian ini dilakukan untuk mengetahui potensi ekonomi kegiatan daur ulang sampah plastik oleh sektor informal di Kecamatan Purwodadi. Penelitian dilakukan melalui survei menggunakan kuesioner terhadap 29 pelaku daur ulang. Hasil penelitian menunjukkan bahwa potensi ekonomi yang terdapat dalam usaha daur ulang sampah plastik pada tiap tingkatan pelaku daur ulang berbeda-beda. Berdasarkan analisis kelayakan ekonomi menggunakan  nilai Net Present Value (NPV), Benefit Cost Ratio (BCR),  dan  Internal Rate of Return (IRR) dapat disimpulkan bahwa usaha daur ulang tingkat penggiling layak secara ekonomi dengan nilai NPV Rp 923.395.260  (NPV > 1), nilai BCR 1,58 (BCR > 1), dan nilai IRR 56,82. Benefit (manfaat) dari implementasi program 3R sampah plastik pada sektor informal secara umum dapat digolongkan menjadi dua manfaat, yaitu manfaat langsung (direct benefit) dan manfaat tidak langsung (indirect benefit). Manfaat langsung (direct benefit) berupa keuntungan penjualan sampah plastik. Keuntungan bersih tiap jenis sampah plastik pada tingkat pemulung  antara Rp 500-Rp 2.600, tingkat bank sampah berkisar antara Rp 100-Rp 400, tingkat pengepul I berkisar antara Rp 91,67-Rp 391,67, tingkat pengepul II berkisar antara Rp 173,46-Rp 473,46, tingkat bandar berkisar antara Rp 186,94-Rp 686,94, dan tingkat penggiling berkisar antara Rp 136,23-Rp 1.136,32. Manfaat tidak langsung (indirect benefit) adanya pengelolaan sampah plastik oleh sektor informal yaitu tereduksinya sampah plastik di Kecamatan Purwodadi sebesar 10,08%.ABSTRACTRecycling of waste material is an effective way to eliminate environmental pollution and reduce the volume of its generation in landfills. This research purpose was to determine the economical potention of plastic waste recycling business by the informal sector in Purwodadi District. The research method by a questionnaire survey of 29 recycling actors. The results showed that the economical potention of the plastic waste recycling business at each level of the recycling actors was different. Based on the economic feasibility analysis using Net Present Value (NPV), Benefit Cost Ratio (BCR), and Internal Rate of Return (IRR), it can be concluded that recycling business at the grinder level is economically feasible with NPV value of Rp 923,395,260 (NPV> 1) , BCR value 1.58 (BCR> 1), and IRR value 56.82. The benefits of implementing the 3R plastic waste program in the informal sector can be classified into two benefits, there are direct benefit and indirect benefit. The direct benefit can be formed the profit from selling plastic waste. The net profit of each type of plastic waste at the scavenger level is about Rp 500-Rp 2,600, the level of waste bank about Rp 100-Rp 400, the level of collectors I about Rp 91.67-391.67, the level of collector II about  Rp 173.46-Rp 473.46, the level of dealer about Rp 186.94-Rp 686.94, and the grinder level about Rp 136.23-Rp 1,136.32. The indirect benefit of plastic waste management by the informal sector is the reduction of plastic waste in Purwodadi District for about 10.08%.
Peningkatan Produktifitas UKM Soun di Klaten melalui Introduksi Sistem Pemasakan Menggunakan Steam Mohamad Djaeni; Ari Wibawa Budi Santosa; Mochtar Hadiwidodo; Febiani Dwi Utari
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 1, No 3 (2019)
Publisher : Fakultas Teknik Universitas Diponegoro

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Abstract

Desa Daleman, Kecamatan Tulung, Kabupaten Klaten merupakan sentra industri kecil soun. Kurang  lebih ada 8 unit rumah tangga  yang menjalankan wirausaha soun (sohun) ini, dari kapasitas kecil (omset < Rp 50 juta per bulan) sampai dengan kapasitas cukup besar (omset > Rp 100 juta per bulan). UKM Bintang Singa merupakan salah satu diantara puluhan UKM yang menjalankan wirausaha soun secara turun teumurun. Seperti UKM Soun pada umumnya, UKM Bintang Singa memnghadapi beberapa kendala diantaranya adalah bahan baku pati pohon aren, penggunaan pemutih pangan dengan kaporit, proses produksi yang belum efisien (pemasakan, pembentukan soun, dan pengeringan), serta sumber daya tenaga manusia. Adanya permasalahan ini, maka UKM saat ini cukup kesulitan memenuhi permintaan konsumen, mendapatkan sertifikat jaminan kualitas produk, serta mendapatkan akses pemasaran yang lebih luas. Untuk  mengatasi kendala padaUKM  mitra tersebut,  maka  tim Pengabdian Masyarakat UNDIP merancang sebuah kegiatan introduksi sistem pemasakan menggunakan steam untuk peningkatan efisiensi energi dan kapasitas produksi. Hasil positif didapatkan dengan adanya peningkatan kapasitas produksi hingga 3,5 kali.
PEMBUATAN GULA SEMUT KELAPA DI DESA UJUNG – UJUNG, KEC. PABELAN, KAB. SEMARANG Mochtar Hadiwidodo; Anik Sarminingsih
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 2, No 1 (2020)
Publisher : Fakultas Teknik Universitas Diponegoro

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Abstract

Berdasarkan Badan Pusat Statistik (BPS) Tahun 2018 Desa Ujung-Ujung  Kecamatan Pabelan Kabupaten Semarang merupakan desa dengan luas wilayah 2,83 km2. Desa Ujung–ujung memiliki wilayah perkebunan yang cukup luas yaitu sekitar 7,83 Ha. Salah satu hasil perkebunan yang mendominasi yaitu kelapa. Pemanfaatan kelapa yang dilakukan oleh masyarakat sekitar yaitu pembuatan gula kelapa. Selama ini, produk gula kelapa yang terdapat di pasaran masih memiliki kelemahan diantaranya yaitu memiliki daya simpan yang tidak lama (sekitar 2-4 minggu), belum adanya pengemasan yang baik, serta kurang praktis dalam penyajian. Salah satu alternatif untuk mangatasi kekurangan gula kelapa yang ada saat ini yaitu perlu dilakukan perubahan bentuk gula kelapa dari cetak menjadi butiran (gula semut). Pada Kegiatan Pengabdian Kepada Masyarakat, Tim Pelaksana bekerjasama dengan Mitra pada Desa Ujung Ujung, Kelompok Tani Ngadimakmur 1 untuk melakukan koordinasi dalam meningkatkan potensi daerah dengan melakukan pembuatan produk gula semut kelapa. 
Improving Recycled Waste Management Performance in Ngaliyan District, Semarang City Prihanita Ratih Fitriandani; Mochtar Hadiwidodo; Haryono Setiyo Huboyo
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 19, No 2 (2022): July 2022
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (950.928 KB) | DOI: 10.14710/presipitasi.v19i2.231-238

Abstract

The waste that enters the Jatibarang landfills does not go through the management and processing process in advance, and the people's laziness in sorting waste has resulted in an increase in waste at the Jatibarang landfills. Ngaliyan reduce, reuse, recycle (3R) waste management site is currently inactive due to a lack of implementation in aspects of waste management. Therefore, it is necessary to plan waste management as an effort to overcome urban waste by increasing performance at reduce, reuse, recycle (3R) waste management sites. Data collection methods used are sampling, interviews, and questionnaires. In this technical, operational planning of waste management, an area of reduce, reuse, recycle (3R) waste management site is required of 661 m2. Organic waste is processed through composting using the Open Windrow method, and inorganic waste is managed using the MRF (material recovery facility) method. The total cost required is IDR 11,135,856,300.00. The community is expected to be able to participate in waste processing and management through 3R-based sorting, comply with applicable regulations, and pay a retribution every month.
Forecasting Greenhouse Gas Emissions from Heavy Vehicles: A Case study of Semarang City Mochamad Arief Budihardjo; Isaaf Fadhilah; Natasya Ghinna Humaira; Mochtar Hadiwidodo; Irawan Wisnu Wardhana; Bimastyaji Surya Ramadan
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 2 (2021): July 2021
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.113 KB) | DOI: 10.14710/presipitasi.v18i2.254-260

Abstract

In Indonesia, transportation sector, specifically road transport consumed most energy compared to other sectors. Eventually, the energy consumption will increase due to the growth of vehicle number that also escalate emission. Vehicle emissions had been recognized as a significant contributor to atmospheric greenhouse gas (GHG) pollution. Heavy-duty vehicles are considered as main sources of vehicular emissions in most cities. Therefore, it is crucial to take into account heavy-duty vehicle emission projections in order to support policymakers to identify vehicle emissions and develop pollution control strategies. The aim of this study is to forecast heavy-duty vehicle population, vehicle kilometers travelled (VKT), fuel consumption, and heavy-duty vehicle emissions using data of Semarang City to illustrate greenhouse gas emission of big cities in Indonesia. Business as Usual (BAU) and The Intergovernmental Panel on Climate Change (IPCC) method were incorporated to determine vehicle emission projection. Heavy-duty vehicle emissions increase from 2021 to 2030 by 12.317 to 22.865 Gg CO2/year with amount trucks and buses emissions of 21.981,5 Gg CO2/year and 884,2 Gg CO2/year, respectively.
Removal Efficiency of Chemical Oxygen Demand on Greywater using Multi Soil Layering (MSL) Technology Syafrudin Syafrudin; Mochtar Hadiwidodo; Irawan Wisnu Wardhana; Tika Ayu Kusuma Wardani; Indah Sekar Arumdani; Sudarno Sudarno; Nurandani Hardyanti
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 2 (2021): July 2021
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.248 KB) | DOI: 10.14710/presipitasi.v18i2.299-305

Abstract

Greywater is household waste sourced from kitchens and bathrooms, except for toilets. Around 58%-85% of greywater can be generated from the total volume of household wastewater per house. It is necessary to treat wastewater before it is discharged into water bodies to prevent the adverse effects of contaminants on the environment and human health while reducing the demand for clean water. However, due to environmentally friendly, socially sustainable, and economical treatment costs, considering that greywater is produced every day and continuously, Multi Soil Layering (MSL) technology can be an alternative to remove contaminants in water. Thus, this study aims to determine the migration of COD in greywater using MSL technology. Other parameters tested were pH and temperature by taking samples of wastewater in residential areas of Semarang City. In this study, there are two stages, namely the preliminary stage and the running stage. The MSL system will use three reactors with andosol soil, apus bamboo, and coconut shell activated charcoal as mixed soil blocks (SMB). Reactor A (activated charcoal and andosol soil), reactor B (bamboo apus and andosol soil), reactor C (andosol soil, bamboo apus, activated charcoal). The results of domestic wastewater treatment using the MSL method in each of the three reactors could remove COD by 75%, 74%, and 76%. Reactor C obtained the highest COD removal efficiency compared to other reactors.
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 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