Article Per Year (5 Year)
p-Index From 2019 - 2024
1.152
P-Index
This Author published in this journals
All Journal Ethos Journal of Engineering and Technological Sciences FLUIDA Fullerene Journal of Chemistry Kumawula: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat Bumi Raflesia
Jayanti, Retno Dwi
Politeknik Negeri Bandung
Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Social Sciences Other

Published : 7 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 7 Documents
Search

 1 
Case Study of a Small Scale Reverse Osmosis System for Treatment of Mixed Brackish Water and STP Effluent Widiasa, I Nyoman; Jayanti, Retno Dwi
Journal of Engineering and Technological Sciences Vol 49, No 2 (2017)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4093.066 KB) | DOI: 10.5614/j.eng.technol.sci.2017.49.2.3

Abstract

A case study on utilizing reverse osmosis (RO) technology to fulfill fresh water needs at a mall and a hotel has been done on Bali Island, Indonesia. A mix of brackish water and sewage treatment plant (STP) effluent was used as feed water in the RO system. The system used 36 membrane elements (CSM RE 8040 BLN) arranged into two stages: 8 pressure vessels (PVs) in the first stage and 4 PVs in the second stage, each loaded with 3 membranes. The objectives of this research were to assess the cleaning effectivity in the plant, to evaluate the cleaning of 1 membrane element using a CIP system, and to assess the use of the membrane for filtration in the pre-treatment system. SEM and FTIR analysis indicated that the foulants on the membrane surface were dominated by organic foulants and inorganic deposits. To clean the discarded membrane the proposed method used NaOH solution (pH 12 and pH 13) and citric acid (pH 2 and pH 3). All membranes displayed a dramatic decline in rejection of about 80%. Based on the rejection tests of SO42-, Cl-, turbidity reduction approached 100%. It can be concluded that an RO membrane that has undergone selectivity decline can be re-used as a filtration membrane in the pre-treatment system.
RANCANG BANGUN SISTEM PENGOLAHAN AIR JERNIH DI KAMPUNG WISATA SABLON Rony Pasonang Sihombing; Agustinus Ngatin; Joko Suryadi; Retno Dwi Jayanti; Yunus Tonapa Sarungu; Robby Sudarman
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 5, No 1 (2022): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v5i1.35907

Abstract

Air bersih yang memadai secara kuantitas, kualitas dan kontinuitas merupakan kebutuhan penting untuk kelangsungan hidup manusia. Oleh karenanya diperlukan suatu instalasi pengolahan air untuk menunjang kebutuhan ini. Air tanah merupakan air yang belum mengalami proses pengolahan dengan kriteria kualitas air yang sudah mendekati air bersih. Metode pengolahan air yang dilakukan menggunakan metode filtrasi fisik dan kimia sebelum digunakan untuk kebutuhan sehari-hari. Jenis filter yang digunakan adalah filter benang ukuran 10 µm, filter polipropilen (PP) 10 µm  dan filter karbon aktif. Berdasarkan hasil rancangan, air yang dihasilkan pada sistem rancang bangun diantaranya adalah air dengan kualitas kesadahan 2.3 NTU, masa pakai filter benang 14 hari/bulan, filter PP 2.4 hari/bulan, dan filter karbon aktif 30 hari/bulan. Untuk kemudahan operasional, sistem rancang bangun untuk filter PP dibuat paralel 3 agar perawatan dapat dilakukan setiap minggu.
Fermentasi Kitin dari Limbah Cangkang Kepiting Menggunakan Jamur Rhizopus Oryzae pada Berbagai Kadar Air Retno Dwi Jayanti; Unung Leoanggraini
Jurnal Kimia Fullerene Vol 5 No 1 (2020): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.395 KB) | DOI: 10.37033/fjc.v5i1.144

Abstract

Chitin on crab shell waste can be obtained by fermentation process use Rhizopus oryzae. The objective of this research are to determine the optimum of water content on crab shell waste fermentation by Rhizopus oryzae for chitin production. Fermentation process is carried out for 72 hours, 5 of pH, 37oC, and 10% (v/w) of inoculum addition. Water content on fermentation process were varried whithin 40%, 50%, and 60% respectively. Fermentation process were carried out by 40% of water content reported as the optimum based on the deproteinization degree and the solubility in acidic solution.
Pembuatan dan Pengujian Pupuk Organik Cair (POC) dari Limbah Pasar dengan Menggunakan Bioaktivator EM4 Delinda Nirmala Afiyah; Emelia Uthari; Dewi Widyabudiningsih; Retno Dwi Jayanti
Jurnal Kimia Fullerene Vol 6 No 2 (2021): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v6i2.325

Abstract

Organic waste from market rubbish can be utilized as liquid organic fertilizer. In general, liquid organic fertilizers contain nutrients such as Nitrogen, Phosphorus, Potassium, and C-Organic that are needed by plants. The objective of this research are to manufacture liquid organic fertilizer through anaerobic fermentation from market rubbish with the addition of an EM4 bio activator and to determine the optimum time. The nutrients content were determined using the Kjeldahl method, UV-VIS Spectrophotometry, and Atomic Adsorption Spectroscopy. Liquid Organic Fertilizer that had the best quality among all types is from non-green vegetable. It has 0,45% of nitrogen, 0,08% of phosphorus, 0,34% of potassium, and 2,8% of C-organic respectively. The optimum time for POC fermentation occurred on the 14th day. The nutrient levels of all types of liquid organic ferilizer produced have not meet the minimum technical requirements of the quality of liquid organic fertilizers based on the Decree of the Minister of Agriculture of the Republic of Indonesia Number 261/Kpts/Sr.310/M/4/2019
Pengaruh Laju Alir Terhadap Penurunan Pengotor Limbah Laundry Metode Elektrokoagulasi Kontinyu Berpengaduk Agustinus Ngatin; Adi Rizki Nugraha; Mukhtar Gozali; Ageng Priyambudi; Tri Hariyadi; Rony Pasonang Sihombing; Yusmardhany Yusuf; Retno Dwi Jayanti; Retno Indarti
Fluida Vol 15 No 2 (2022): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i2.4040

Abstract

Limbah laundry dapat menjadi masalah serius bagi lingkungan jika dibuang tanpa pengolahan. Masalah yang timbul diantaranya nilai Chemical Oxygen Demand (COD), fosfat, dan kekeruhan yang tinggi. Tujuan penelitian yaitu mempelajari pengaruh laju alir terhadap efisiensi penurunan kadar kekeruhan, COD, dan TSS, serta menentukan kondisi optimalnya dengan alat elektrokoagulasi kontinyu berpengaduk. Reaktornya adalah reaktor berkapasitas 10 L dilengkapi pengaduk 180 rpm, pompa peristaltik, rectifier dan 3 pasang elektroda Alumunium dengan ketebalan 0,3x15x15cm yang disusun secara monopolar. Percobaan variasi laju alir (115mL/menit, 170 mL/menit, 340mL/menit) dilakukan dengan rapat arus tetap (70 A/m2), dengan waktu operasi 60 menit untuk setiap variasi. Hasilnya menunjukkan bahwa pada laju tinggi (340 mL/menit) dan laju rendah (115 mL/menit) menghasilkan efisiensi penurunan pengotor yang rendah dan laju alir terbaik ditunjukkan pada 170 mL/menit. Kondisi optimal terjadi pada laju alir 170 mL/menit pada rapat 70 A/m2 menghasilkan efisiensi penurunan kekeruhan, COD, dan TSS berturut-turut 89,35%, 73,33%, dan 99,26%. Laundry waste can be a serious problem for the environment if it is disposed of without treatment. Problems that arise include the value of Chemical Oxygen Demand (COD), phosphate, and high turbidity. The aims of the research were to study the effect of flow rate and current density on the efficiency of reducing turbidity, COD, and TSS levels, and to determine the optimal conditions using a continuous stirred electrocoagulation device. The reaktor used is a reaktor with a capacity of 10 L equipped with a 180 rpm stirrer, a peristaltic pump, a rectifier and 3 pairs of aluminum electrodes with a thickness of 0.3x15x15cm arranged in a monopolar manner. The flow rate variation experiment was carried out with a constant current density (70 A/m2), and the current density variation experiment was carried out with a fixed flow rate (170 ml/minute) with an operating time of 60 minutes for each variation. The results of the flow rate variation showed that at a high rate (340 ml/min) and a low rate (115 ml/min) resulted in a low impurity reduction efficiency, the best flow rate was shown at 170 ml/min. The results of the current density variation show that the increase in impurity reduction efficiency occurs as the current density increases, the best results occur at a current density of 70 A/m2. Optimal conditions occurred at a flow rate of 170 ml/min at a rate of 70 A/m2 resulting in the efficiency of reducing turbidity, COD, and TSS respectively 89.35%, 73.33%, and 99.26%.
P PENINGKATAN TARAF EKONOMI MELALUI PEMBERDAYAAN MASYARAKAT DALAM MENGELOLA SAMPAH PADA MASA PANDEMI DI RW 09 PADA MASA PANDEMI: Pemberdayaan Masyarakat dalam Mengelola Sampah Euis Sartika; Sri Murniati Murniati; Fatmi Hadiani; Agus Binarto; Retno Dwi Jayanti
Jurnal Pengabdian Masyarakat Bumi Raflesia Vol. 5 No. 3 (2022): Jurnal Pengabdian Kepada Masyarakat Bumi Raflesia
Publisher : Universitas Muhammadiyah Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Permasalahan sampah meningkat di masa pandemic, akibat melonjaknya sampah domestik selama work from home (WfH) dan aktivitas belanja online sebesar 27%-35%, walaupun dapat menggerakkan perekonomian, tetapi sampah kemasan menumpuk. Desa Sukamenak RW 09, memiliki permasalahan sampah dan belum mempunyai sistem pengolahan sampah mandiri. Polban sebagai instansi perguruan tinggi, membantu menyelesaikan permasalahan sampah di wilayah ini, melalui Pengabdian kepada Masyarakat (PKM) dengan program antara lain : edukasi, pelatihan, Bimtek, pendampingan, fasilitasi, dan evaluasi. Kegiatan meliputi sosialisasi pemilahan sampah dengan konsep 3R (Reuse, Reduce, Recycle), pelatihan pengolahan sampah anorganik menjadi produk daur ulang, pelatihan sampah organic menjadi pupuk, pelatihan pembuatan paving blok, dan pembentukan bank sampah. Kegiatan dimulai dengan identifikasi kemampuan awal masyarakat melalui kuesioner, hasil menunjukkan, sekitar 70% masyarakat mempunyai pengetahuan yang baik tentang sampah, namun sikap dan tindakan penanganan sampah sekitar 20%. Salah satu penyebabnya, belum pernah dilakukan sosialisasi pemanfaatan sampah. Pelatihan sampah anorganik terfokus kresek / plastic ( sampah dominan) yang disetrika sehingga menjadi bahan lain yang lebih tebal untuk dijadikan tas, dompet, sandal, bunga, dan lain sebagainya dan bernilai ekonomi. Pupuk dari sampah organic, dimanfaatkan sebagai media tanam untuk tanaman sayuran atau dapat dijual dalam skala besar dengan kemasan menarik. Bank sampah “RW 09 Berseri” diharapkan dapat meminimalisir volume sampah yang masuk TPA, tabungannya dapat diambil. Diharapkan setiap keluarga melakukan pemilahan sampah sejak dari rumah, sebagian sampah anorganik dijadikan produk daur ulang, sebagian lagi ditabung, dan sisanya dibuang. Pemanfatan sampah plastik dalam skala besar adalah pembuatan paving blok, yang mempunyai kualitas lebih kuat, ringan, dan tahan bantingan. Kata Kunci: Sampah Organik, Sampah Anorganik, Bank Sampah, 3R (Reuse, Reduce, Recycle)
Increasing Food Security Through Waste Management In Pandemic Time Euis Sartika; Sri Murniati; Siti Yuliah; Fatmi Hadiani; Agus Binarto; Retno Dwi Jayanti
ETHOS (Jurnal Penelitian dan Pengabdian) Vol 11 No.1 (Januari, 2023) Ethos: Jurnal Penelitian Dan Pangabdian Kepada Masyarakat (Sains & Tekno
Publisher : Universitas Islam Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29313/ethos.v11i1.8486

Abstract

The abstract of the During the pandemic, people's activities were dominantly carried out at home, resulting in increased online shopping activities and their packaging which caused accumulation of household waste. The RW 05 area of Sukamenak Village, Margahayu District, Bandung does not yet have independent waste management, coupled with the low awareness and knowledge of residents about waste. Some residents were affected by layoffs, as a result of which the fulfillment of food needs was disrupted. This is the starting point for the waste problem in RW 05. Bandung State Polytechnic (Polban), takes a role in helping to solve this problem. PKM activities aim is to increase public knowledge in sorting household waste through the 3R program (Reuse, Reduce, Recycle), effective management of inorganic and organic waste, Budikdamber (Cultivating Fish in Ember) aimed at increasing family food security, and building a bank The methods used are training, technical guidance in the field, mentoring, and evaluation. The results of the activity show that inorganic waste management produces daily necessities and can be sold to increase income. Organic waste is processed into liquid fertilizer and solid fertilizer for yard greening. Catfish and kale from Budikdamber can increase family food security, especially meeting protein and vegetable needs. The construction of the "Suka Berseri RW 05" waste bank can reduce the volume of waste and residents can withdraw their savings at any time. The results of the questionnaire show that people's awareness and knowledge on waste management increased significantly.
Co-Authors Adi Rizki Nugraha Ageng Priyambudi Agus Binarto Delinda Nirmala Afiyah Emelia Uthari Euis Sartika Fatmi Hadiani I Nyoman Widiasa Mukhtar Gozali Ngatin, Agustinus Retno Indarti Robby Sudarman Sihombing, Rony Pasonang Sri Murniati Suryadi, Joko Tri Hariyadi Unung Leoanggraini Widyabudiningsih, Dewi Yuliah, Siti Yunus Tonapa Sarungu Yusmardhany Yusuf