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Wahyu Dwi Lestari
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Journal : Biomedical and Mechanical Engineering Journal

 1 
Analysis of effect Magnesium Ammonium Phospate (MAP) Concentration on Struvite Morphology in A Vertical Reactor Luluk Edahwati; Sutiyono; Atika Andini; Wahyu Dwi Lestari; Tria Puspa Sari; Ndaru Adyono; Novel Karaman
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 1 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Struvite was a white crystal known as Magnesium Ammonium Phosphate Hexahydrate (MgNH4PO4.6H2O). In industry, struvite was found in the pipes crust which the hot fluid through passes. Struvite is often used as fertilizer because it contains phosphate content. The one of benefits of struvite crystals is slow release fertilizer, so it can be more durable, which is good for the growth of the plants. The Precipitation technology is currently one of the most widely applied technologies in struvite formation. The process of forming struvite is carried out by using a vertical reactor. The process started by mixing the equimolar solutions of MgCl2, NH4OH, and H3PO4 with a concentration ratio of 1: 1: 1 and 1: 1: 2. The process was carried out with the condition at the 30°C while the air inlet rate was 1.25 liters/min. The pH of the solution is pH 9 and controlled using NaOH solution. The process was carried out in the steady state condition. Then the solution was filtered and solid was dried at room temperature for 48 hours. From this study, the concentration ratio of 1:1:2 was obtained the best composition of struvite compared to the others ratio. The solid was analyzed by using the SEM-EDX instrument. The morphology of struvite was formed an irregular pyramid-like crystal or commonly referred to as an authorhombic shape.
Perancangan Mesin Pengupas dan Pemarut Batang Ubi Kayu: Konsep Rancangan Mesin Novel Karaman; Ndaru Adyono; Tria Puspa Sari; Luluk Edahwati; Wahyu Dwi Lestari
Biomedical and Mechanical Engineering Journal (BIOMEJ) Vol. 1 No. 1 (2021): BIOMEJ
Publisher : Mechanical Engineering Department at Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Indonesia negara penghasil ubi kayu terbesar ke lima di dunia dimana produksi ubi kayu Nasional per tahun mencapai 23 juta ton. Disisi lain terdapat limbah organik berupa batang ubi kayu dengan potensi pemanfaatan kandungan alpha-selulosa batang yang besar. Alpha-selulosa merupakan bahan dari biomass yang sangat dibutuhkan dalam bidang industri maupun sumber energi yang terbarukan. Alpha-sellulose yang berkualitas tinggi dihasilkan dari serat batang ubi kayu yang telah dipisahkan bagian kulit luarnya. Penelitian dalam perancangan mesin yang mampu memproses pengupasan dan pemarutan batang ubi kayu secara bersamaan sangatlah berpotensi meningkatkan produktivitas pembuatan bahan baku Alpha-selulosa untuk kebutuhan industri. Perancangan purwarupa mesin pengupas dan pemarut batang ubi kayu menggunakan pendekatan elemen mesin diharapkan menghasilkan rancangan mesin yang memiliki spesifikasi motor penggerak utama 3 phase kapasitas 0,5 HP dengan putaran 1400 rpm yang terdiri dari 2 transmisi berupa pulley dan transmisi gear box ratio 60.
Analysis of effect Magnesium Ammonium Phospate (MAP) Concentration on Struvite Morphology in A Vertical Reactor Luluk Edahwati; Sutiyono; Atika Andini; Wahyu Dwi Lestari; Tria Puspa Sari; Ndaru Adyono; Novel Karaman
BIOMEJ Vol. 1 No. 1 (2021): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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

Abstract

Struvite was a white crystal known as Magnesium Ammonium Phosphate Hexahydrate (MgNH4PO4.6H2O). In industry, struvite was found in the pipes crust which the hot fluid through passes. Struvite is often used as fertilizer because it contains phosphate content. The one of benefits of struvite crystals is slow release fertilizer, so it can be more durable, which is good for the growth of the plants. The Precipitation technology is currently one of the most widely applied technologies in struvite formation. The process of forming struvite is carried out by using a vertical reactor. The process started by mixing the equimolar solutions of MgCl2, NH4OH, and H3PO4 with a concentration ratio of 1: 1: 1 and 1: 1: 2. Theprocess was carried out with the condition at the 30°C while the air inlet rate was 1.25 liters/min. The pH of the solution is pH 9 and controlled using NaOH solution. The process was carried out in the steady state condition. Then the solution was filtered and solid was dried at room temperature for 48 hours. From this study, the concentration ratio of 1:1:2 was obtained the best of struvite compared to the others ratio. The solid was analyzed by using the SEM-EDX instrument. The morphology of struvite was formed an irregular pyramid like crystal or commonly referred to as an authorhombic shape.
SEM Analysis of UHMWPE for Biomedical Application Wahyu Dwi Lestari; Luluk Edahwati; Tria Puspa Sari; Ndaru Adyono; Novel Karaman
BIOMEJ Vol. 1 No. 1 (2021): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

The objective of this study is to investigate the wear mechanism of UHMWPE acetabular liner. There were three samples of acetabular liner with variations without crosslink, with crosslink doses of 50 kGy and 100 kGy which were subjected to a wear testing process. The wear test was carried out using a Tribometer wear testing machine with a total of 30,000 cycles and a load of 800N. Microstructure analysis was performed using scanning electron microscopy (SEM). The results show that the surface of the UHMWPE acetabular liner with the crosslink treatment is smoother than the untreated one. This shows that UHMWPE with crosslink treatment has a lower wear rate, where the greater the crosslink dose the lower the wear rate. The wear mechanism that occurs in this study is the third body abrasion which leads to adhesive wear.
Co-Authors Adnyono, Ndaru Ahmad Khairul Faizin Ahmad Khairun Faizin Alfattama, Lona Chinsia Althafiansyah, Rafif Zaidan Arie Chintya Martania Arif Hidayat, Muhammad Aryananda, Rangga Laksana Atika Andini Azizullah, Dana Afif Bayuseno, A P Danaryanto, A T Dera, Nurmala Santi Dewi, Deshinta Arrova Dwi Ari Suryaningrum, Dwi Ari Eva Yulia Puspaningrum Faiza, Linda Ziyadatul Faizin, Ahmad Khairul Fara Disa Durry Fauzan Raka Mawandi Febriansyah, Rahmad Ady Ferdi Kurniawan Fikri, Kemas Achmad Firmansah, Achmad Robi Ghozali, Achmad Imam Harya, Gyska Indah Humairah, Sayyidah I Gede Susrama Mas Diyasa Ika Nawang Puspitawati Ikhsanudin, Zaky Ishak, Sahional Ismail, R Issafira, Radissa Dzaky Jamari, J Kilo, Faisal Krolczyk, Grzegorz Kurniawan, Ferdi L.Urip Widodo, Yohandrik Novel Karaman Lestari, Mufida Diah Luluk Edahwati Luluk Edahwati Luluk Edahwati Luluk edahwati Mahameru, Rolland D.K. Mahameru, Rolland Darin Khalifah Mahmudah, Imam Maulana, Hendra Mawandi, F.R. Mawandi, Fauzan Raka Mirnanda, D. Mirnanda, Dwiky Mr. Sutiyono Muhammad Abdillah Mukti, Abdi Satryo Ndaru Adyono Ndaru Adyono Ndaru Adyono, Ndaru Nikmah, Ulin Novel Karaman Nugroho, A Nunung Lusiana Margawati Nur Aini Fauziyah Nurrokhim, F.H.R. Nurrokhim, Firmansyah Hafizh Rizal Nuryananda, Praja Firdaus Pilargenta , Higan Prayoga, Adimas Dwi Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Rahardja, Dimas Revindra Rosyadi, Mochammad Wildan Rosyadi, Mochammad Willdan Rosyadi, Willdan Safitri, P.D. Safitri, Puspa Dinda Sakinah Sanjaya, Kadek Heri Sari, Tria Puspa Seno Darmanto Sri Utami Handayani Suares, Reza Mardiansah Sutiyono Talango, Novriyanti Tjahjono, Jojok Dwirido Tria Puspa Sari Tyas Martika Anggriana Wahyu Caesarendra Widagda, Garda Dibya Widya Kusumaningsih Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Yanto, Agus Dwi Yudha, Dhian Satria Zein, Isynariyah