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All Journal Barometer Nusantara Science and Technology Proceedings Jurnal Bahan Alam Terbarukan
A. P. Bayuseno
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Economics, Econometrics & Finance Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology

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Struvite Crystallization Control with Addition of Maleic Acid in Liquid Waste as Fertilizer Materials Perwitasari, D. S.; A. P. Bayuseno; J. Jamari; S. Muryanto
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology for People Empowerment.
Publisher : Future Science

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Abstract

Struvite was magnesium ammonium phosphate (MgNH4PO4.6H2O) in the form of white orthorhombic crystals. In aqueous solutions containing Mg2+, NH4+ and PO42- in the equivalent amount of 1: 1: 1 molar ratio, struvite crystallization can occur spontaneously with the influence concentration maleic acid, temperature and stirred speeds. Struvite was a mineral crystal commonly found in pipes, pumps and other industrial equipment. Deposition of struvite can interfere with equipment performance and cause increased maintenance costs. The experiment was carried out in a batch process using 500 ml of mechanical glass at 200, 300 and 400 rpm. Maleic acid concentration as an additive 0.0; 1.0; 10.0; and 20.0 ppm in solution at 30oC and 40oC. The more amount of additive maleic acid concentration added, the smaller the rate constants value. By decreasing the constant rate, the growth of struvite crystals also decreases so that the growth of struvite crystals becomes inhibited, but different for stirring, the higher the stirred speeds the rate constants will increase so that crystal growth also increases. The crystals obtained were characterized using SEM-EDX and XRPD Rietveld. Characterization results show that struvite was the main crystal. The morphology of crystals was prismatic. The research has been carried out to increase understanding of the extraction of phosphate from industrial wastewater through struvite crystallization and was useful in prospective wastewater treatment technologies for phosphat recovery and has the potential that can be used as fertilizer.
IDENTIFIKASI STRUKTUR KRISTAL DAN MORFOLOGI ENDAPAN KALSIUM KARBONAT (CaCO3) PADA PIPA TEMBAGA Eri Widianto; Kardiman Kardiman; A. P. Bayuseno; Stefanus Muryanto
BAROMETER Vol 2 No 2 (2017): Barometer
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (413.048 KB) | DOI: 10.35261/barometer.v2i2.907

Abstract

Telah dilakukan penelitian tentang penumbuhan kerak kalsium karbonat (CaCO3) pada pipa uji tembaga menggunakan peralatan Closed Circuit Scale Simulator. Kerak CaCO3 dihasilkan dengan mereaksikan kristal CaCl2 dan NaNO3 yang dialirkan pada pipa uji dengan laju aliran tetap 35 ml/menit. Pada penelitian ini dilakukan penambahkan aditif berupa asam tartrat (C4H6O6) dengan konsentrasi 6 ppm. Karakterisasi sampel kerak menggunakan X-Ray Diffaction (XRD) dan Scanning Electron Microscopy (SEM) menunjukan bahwa endapan kerak yang dihasilkan merupakan kristal CaCO3 dengan fasa calcite berbentuk rhombohedral. Penambahan aditif asam tartrat 6 ppm mempengaruhi derajat kristalin CaCO3, terlihat jelas pada puncak intensitas yang menurun dan puncak-puncak bergeser ke arah sudut  yang lebih besar.  Morfologi kerak CaCO3 dengan penambahan aditif terlihat tidak homogen, menunjukkan bahwa penambahan aditif dapat menghambat proses kristalisasi. Dengan kata lain, penambahan aditif mampu menghambat laju pertumbuhan kristal, sehingga memungkinkan kerak yang terbentuk merupakan jenis softscale yang mudah untuk dibersihkan.
Synthesis of Hydroxyapatite from Green Mussel Shells Using Micro-wave Method Through Ultrasonic Mixing Process and Magnetic Stirrer Stirring Agus Prasetyo; Risky Ismail; A. P. Bayuseno; Samsudin Anis; Deni Fajar Fitriyana; Muhammad Afrizal; Januar Parlaungan Siregar
Jurnal Bahan Alam Terbarukan Vol. 14 No. 1 (2025): June 2025 [Nationally Accredited Sinta 3]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v14i1.25497

Abstract

Hydroxyapatite (HAp) is a biomaterial containing calcium phosphate with the chemical formula which is similar to the structure of human bone, so it is good for the purpose of healing human bones and teeth. HAp synthesis has several methods that can affect the results of HAp synthesis, such as the method of mixing CaO with phosphate, namely mixing with ultrasonic machines and magnetic stirrers. However, the discussion about the difference of HAp results with the mixing method of ultrasonic machine and magnetic stirrer is still rarely done. Therefore, it is important to examine and compare the characteristics of HAp synthesized by ultrasonic and magnetic stirrer mixing. The result of XRD test shows that HA1 has a purity of weight percentage (wt.%) of HAp crystal of 99.8%, while HA2 has a weight percentage (wt.%) of HAp crystal of 97.7%. For the FTIR test results of both specimens detected the presence of phosphate groups, and hydoxide, where both are the basic form of hydroxyapatite. Carbonate groups were also detected in the test, but it cannot be said to be bad because carbonate is a natural substitute for phosphate. 
Co-Authors Agus Prasetyo Eri Widianto Fitriyana, Deni Fajar J. Jamari Januar Parlaungan Siregar Kardiman Muhammad Afrizal Perwitasari, D. S. Risky Ismail S. Muryanto Samsudin Anis Stefanus Muryanto