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All Journal HAYATI Journal of Biosciences Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Ilmu Lingkungan Jurnal Pembangunan dan Alam Lestari Jurnal Inovasi Teknologi dan Edukasi Teknik JURNAL REKAYASA KIMIA & LINGKUNGAN
Ridwan Muhamad Rifai
Universitas Negeri Malang
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Peningkatan Nilai Ekonomis Sampah Limbah Rumah Tangga dengan Menggunakan Teknologi Mesin Pemilah Sampah Plastik dan Penghancur Sampah Organik Suwarno, Eko; Al Ansyorie, Mohammad Musthofa; Ichwanto, Muhammad Aris; Muhamad Rifai, Ridwan; Bachtiar, Muhammad Affan
Jurnal Inovasi Teknologi dan Edukasi Teknik Vol. 3 No. 4 (2023)
Publisher : Universitas Ngeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um068v3i42023p197-202

Abstract

Sidodadi Village is a village located in Ngantang District, Malang Regency. Sidodadi Village is between 3 towns. Where these 3 villages are still included in the Ngantang District area. Sidodadi Village is divided into 4 hamlets: Simo, Sekar, Salam, and Sidomulyo. Organic waste can be considered environmentally friendly and can even be reprocessed into valuable if appropriately managed. However, if waste is not managed properly, it will cause disease and unpleasant odors because of the rapid decomposition of organic waste. Waste processing using renewable technology is one solution that can be used to process waste properly. The output of this activity is a final report in the form of an Organic Waste Crushing Machine Design, and an ISBN journal regarding the study of increasing the economic value of household waste using organic waste shredding machine technology. This machine can help the village process waste so that waste is not left unattended. Desa Sidodadi merupakan desa yang terletak di Kecamatan Ngantang, Kabupaten Malang. Letak Desa Sidodadi berada diantara 3 Desa, dimana 3 desa tersebut masih termasuk dalam wilayah Kecamatan Ngantang. Desa Sidodadi terbagi menjadi 4 dusun yaitu dusun simo, sekar, salam, dan sidomulyo. Sampah organik bisa dikatakan sebagai sampah ramah lingkungan bahkan sampah bisa diolah kembali menjadi suatu yang bermanfaat bila dikelola dengan tepat. Tetapi sampah bila tidak dikelola dengan benar akan menimbulkan penyakit dan bau yang kurang sedap hasil dari pembusukan sampah organik yang cepat. Pengolahan sampah menggunakan teknologi terbarukan merupakan salah satu solusi yang dapat digunakan guna mengolah sampah dengan benar. Luaran dari kegiatan ini adalah laporan akhir yang berupa Desain Mesin Penghancur Sampah Organik, dan jurnal ber-ISBN mengenai kajian peningkatan nilai ekonomis sampah limbah rumah tangga dengan menggunakan teknologi mesin penghancur sampah organik. Maka dengan adanya mesin ini dapat membantu pihak desa dalam segi pengolahan sampah sehingga sampah tidak dibiarkan begitu saja.
A Kinetic Approach for Employing Two Duckweed Species, Lemna minor, and Spirodela polyrhiza, in the Sustainable Aquaculture Wastewater Treatment and Fish Feed Production Rifai, Ridwan Muhamad; Yulistyorini, Anie; Siswahyudi, Dwi; Pratiwi, Jenvia Rista; Fauzi, Ichsan Achmad; Rachminiwati, Nina
HAYATI Journal of Biosciences Vol. 31 No. 6 (2024): November 2024
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.31.6.1223-1230

Abstract

Duckweed, a widely used natural fish feed, has also become more popular as the phytoremediation agent for wastewater, including one sourced from aquaculture. These two features indicate that duckweed can be utilized in a sustainable aquaculture system by treating and reclaiming nutrients from wastewater and then harvesting them for fish feed production. Hence, this study attempted to assess the approach of the two most known duckweed species, i.e., Lemna minor and Spirodela polyrhiza, in depleting NH4 and PO4 from synthetic controlled aquaculture wastewater as well as to understand their yield based on the N : P ratio. Cultivation in synthetic aquaculture wastewater media was carried out, followed by nutrient uptake and growth analysis. According to statistical analysis, both L. minor and S. polyrhiza could remove NH4 and PO4 with a relatively equal rate (p-val > 0.050). Nonetheless, both duckweed species absorb nitrogen more easily than phosphorous (p-val < 0.050). Considering the yield based on nutrient uptake, NH4 drove a more efficient yield for L. minor to S. polyrhiza at 16.70 g dry biomass/g NH4 and 14.14 g dry biomass/g NH4, respectively. Meanwhile, a higher yield was observed on S. polyrhiza than on L. minor regarding PO4 concentration, at 19.31 g dry biomass/g PO4 and 9.10 g dry biomass/g PO4, respectively. Therefore, a strategy to remove nutrients and produce biomass for fish feed can be formulated based on the N : P concentration ratio, where L. minor tends to produce biomass more rapidly in a higher N : P ratio, whereas S. polyrhiza works in the opposite.
Life Cycle Assessment of the Campus Wastewater Treatment Using the Lab-scale of Anaerobic Baffled Reactor Aziz, Hafif Ahmad Abdul; Yulistyorini, Anie; Rifai, Ridwan Muhamad; Hamzah, Sofiah
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.v22i2.528-546

Abstract

In Indonesia, the waste sector is responsible for 10.59% (130,188.21 GgCO2e) of global warming emissions, one of which is from campus domestic wastewater due to the lack of wastewater treatment plants. Only 0.2% of the 6,472 campuses have treatment systems, such as Universitas Negeri Malang (UM) use a fabricated anaerobic baffled reactor (FABR) for wastewater treatment plants for its green campus initiatives, yet available only for several buildings and do not treat all wastewater generated from the campus activity. However, Life Cycle Assessment (LCA) of ABR system has not been widely studied, especially when it uses in treating of the campus wastewater. This study aims to conduct the LCA of the laboratory -scale ABR system in the campus wastewater treatment with gate-to-gate scope using Simapro 9.1.11 and the CML-IA Baseline. Three scenarios were tested: untreated wastewater, ABR equipped with peristaltic pumps, ABR without pumps. The results indicated that ABR treatment had a significantly lower environmental impact than untreated wastewater, with the greatest reduction in global warming potential (1.51E-08 to 4.98E-11), followed by eutrophication and photochemical oxidation. This study is limited to the ABR system, future research could expand to include the full lifecycle, from material collection to final results. 
Reduksi Nitrogen dan Fosfor dari Air Limbah Budidaya Perikanan menggunakan Free-Water Surface Constructed Wetlands dengan Lemna minor Mufida, Ummi Afifatul; Rifai, Ridwan Muhamad; Fauzi, Ichsan Achmad; Rachminiwati, Nina; Yulistyorini, Anie
Jurnal Ilmu Lingkungan Vol 23, No 4 (2025): July 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.4.907-914

Abstract

Semakin banyaknya pembangunan di Indonesia termasuk fasilitas industri perikanan memberikan dampak pada kondisi lingkungan. Fasilitas industri perikanan di Kota Malang saat ini belum memiliki sistem pengolahan air limbah. Faktanya air limbah budidaya ikan yang dihasilkan dapat mencemari air permukaan. Polutan (Nitrogen dan Fosfor) yang terdapat pada air limbah budidaya ikan baik hasil dari sisa metabolisme maupun sisa pakan ikan dapat menyebabkan eutrofikasi. Penelitian ini bertujuan untuk menganalisa reduksi konsentrasi polutan (Nitrogen dan Fosfor) pada air limbah budidaya perikanan dengan menggunakan tanaman air Lemna minor menggunakan sistem Free-Water Surface Flow Constructed Wetlands (FWS CW). FWS CW yang digunakan dalam penelitian ini mempunyai dimensi tinggi 0,4 m, panjang 2 m dan lebar 1 m. Debit air limbah budidaya ikan yang dialirkan menggunakan dua macam Hydraulic Retention Time (HRT), yaitu 14 jam dan 7 jam. FWS CW dengan HRT 14 jam dengan debit inlet 15,14 mL/s dapat menurunkan konsentrasi amonium, nitrat dan fosfat dengan tingkat efisiensi 50,09%; 28,11%; dan 72,37%. Sedangkan FWS CW dengan HRT 7 jam dan debit inlet 30,28 mL/s dapat menurunkan konsentrasi amonium, nitrat dan fosfat dengan tingkat efisiensi 38,93%; 23,91%; dan 88,28%. Dapat disimpulkan bahwa FWS CW dengan HRT 14 jam lebih efisien untuk mereduksi nitrogen, sedangkan FWS CW dengan HRT 7 jam lebih efisien untuk mereduksi fosfor.
Community Participation Level of Penggung Village on the Agropolitan Region Development in Kecamatan Bandar Nawangan, Kabupaten Pacitan Pratiwi, Jenvia Rista; Parmawati, Rita; Rifai, Ridwan Muhamad
Jurnal Pembangunan dan Alam Lestari Vol. 14 No. 1 (2023): Jurnal Pembangunan dan Alam Lestari
Publisher : Postgraduate School of Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpal.2023.014.01.04

Abstract

Pacitan Regency owns abundant natural resources, one of which is in the agricultural sector. In accordance with the RTRW of Pacitan Regency 2005-2025, there is a development plan for the Agropolitan Area in Bandar and Nawangan Sub-districts. This research aims to find out how the level of community participation in the development of the Agropolitan Area of Bandar Nawangan Subdistrict, Pacitan Regency. The descriptive quantitative approach was used to understand how community involvement in Agropolitan Area development planning. The level of community participation was measured using Arnstein's concept (A Ladder of Citizen Participation) and showed the level of community participation at the informing level, which is included in the tokenism classification. This study’s results recommended assistance to local leaders to have similar goals as the government as the means of increasing community participation. The village leaders have greater influence or control because of their proximity to the community. As a consequence, community participation in the development of the Agropolitan Area of Bandar Nawangan Sub-district, Pacitan Regency will be escalated. Keywords: agropolitan, participation level, arnstein
Analysing Pan Evaporation to Understand Wastewater Treatment Plant Performance, A Case Study in A Manufacturing Industry Rifai, Ridwan Muhamad; Rahmadhani, Fikri Iqbal; Saputro, Endro Hargi; Sarda Dewi, Mega Septia; Pasaribu, Aswin
Jurnal Rekayasa Kimia & Lingkungan Vol 18, No 1 (2023): Jurnal Rekayasa Kimia & Lingkungan (June, 2023 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v18i1.28903

Abstract

Water loss has become a problem with the balance of a water system, including one in the industry. General opinion has considered evaporation as one of the main justifications for explaining the water loss, especially in the area with a higher daily temperature. A study was conducted on a wastewater treatment system owned by a manufacturing industry consisting of semi-open-air sedimentation and aeration ponds, which suddenly experienced a significant deficit in its water balance. Problem-solving was performed by 8-Step Problem Solving approach and root causes were confirmed by estimating water evaporation. The actual water evaporation rate (E) was approached by pan evaporation (Epan) using the partial pressure of the water vapour and the pan evaporation coefficient (Kpan). The study revealed that evaporation (1.670.59mm.d-1 and 1.720.62mm.d-1, for sedimentation pond and aeration pond, respectively) was not the main cause of sudden significant water loss (R2 = .490, p-value .05) and confirmed another root cause. In parallel, a water balance model was constructed and fitted the actual condition (R = .987). A countermeasure was performed against the confirmed root cause followed by a monthly evaluation of water loss using the constructed model with a 3 threshold value (UCL = 9.55%) which showed the elimination of the problem.
Co-Authors Anang Ansyori Anie Yulistyorini Aswin Pasaribu Aziz, Hafif Ahmad Abdul Bachtiar, Muhammad Affan Eko Suwarno Endro Hargi Saputro Fikri Iqbal Rahmadhani Hamzah, Sofiah Ichsan Achmad Fauzi Jenvia Rista Pratiwi Mega Septia Sarda Dewi Mufida, Ummi Afifatul Muhammad Aris Ichwanto Parmawati, Rita Pasaribu, Aswin Rachminiwati, Nina Rahmadhani, Fikri Iqbal Saputro, Endro Hargi Sarda Dewi, Mega Septia Siswahyudi, Dwi