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All Journal Prosiding Semnastek Journal of Applied Sciences and Advanced Technology
Nurul Hidayati Fithriyah
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering

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PENGARUH KADAR Ni TERHADAP SIFAT PERMUKAAN KATALIS Ni BERBAHAN BAKU LIMBAH ELEKTROPLATING Athiek Sri Redjeki; Nurul Hidayati Fithriyah; Alvika Meta Sari
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Pada  proses  elektroplating dihasilkan  limbah  yang  mengancung  bahan  beracun  berbahaya  (B3)seperti ion-ion kromat, sianida, nikel, asam sulfat, natrium hidroksida dan pelarut organik. Logamberat dalam limbah B3 ini, khususnya nikel (Ni), dapat dimanfaatkan sebagai bahan baku katalis.Recoverysemacam ini mewujudkan konsep produksi bersih sekaligus meningkatkan nilai ekonomislimbah. Kandungan Ni dalam limbah elektroplating di wilayah Jabodetabek sebesar rata-rata 19%dapat  menjadi  bahan  baku sintesa katalis NiMnxFe2-xO4.Katalis  ini dapatdigunakan  dalam  reaksioksidasi  CO  menjadi  CO2. Dalam  studi  ini  pengaruh kadar  Ni(1,81 – 2,65%) terhadap sifatpermukaankatalis dipelajari  untuk  menentukan kadar optimal  katalis  Ni yangdisintesis.Peningkatan  kadar  logam  Ni  dapat  meningkatkan  keasaman katalis. Luas  permukaan,diameter  dan  volum  pori katalis juga  meningkat  dengan  peningkatan kadar Ni.Peningkatankeasaman  dan  luas  permukaan  katalis  akan  meningkatkan  reaktivitas  dan  aktivitas  katalisisnya.Morfologi permukaan katalis menunjukkan peningkatan ukuran gumpalan dan penurunan derajatkristalinitas dengan peningkatan kadar Ni. Hal ini dapat menurunkan selektivitas katalis terhadapreaksi oksidasi.
OPTIMIZING OPERATING PARAMETERS AND POLYACRYLIC ACID ANTISCALANT DOSAGE IN A REVERSE OSMOSIS UNIT M Khoirul Ummam; Irfan Purnawan; Nurul Hidayati Fithriyah
Journal of Applied Sciences and Advanced Technology Vol. 8 No. 2 (2025): Journal of Applied Science and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

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Abstract

Reverse osmosis (RO) technology is one of the most widely used and highly effective filtration technologies. RO membranes generally act as barriers to dissolved salts and inorganic compounds, as well as organic molecules witmolecular weights greater than 100 angstroms. Several factors influence the rate of mineral scale formation on the surface of RO membranes, including lower temperatures, which reduce mineral scale solubility, and higher feedwater conductivity or Total Dissolved Solids (TDS), which increase the solubility of slightly soluble salts. This phenomenon is caused by increased ionic interference during the nucleation and crystallization processes of various types of scale. Mineral scaling remains a critical challenge in reverse osmosis (RO) systems, limiting recovery and increasing operational costs. This study optimizes polyacrylic acid (PAA) antiscalant dosage and system recovery in a 120 m³/h industrial BWRO (brackish water reverse osmosis) plant treating water with 20–40 ppm Ca-hardness. Dosages of 3–13 ppm and recoveries of 49–75% were evaluated based on normalized permeate flow (NPF) decline and feed pressure increase, targeting <10% performance loss. Results show that a dosage of 11–13 ppm at 74–75% recovery maintains membrane performance with less than 6.5% NPF decline and minimal pressure increase (below 1.64%) over a production volume of 6,500 m3. Statistical validation (R² > 0.96, p < 0.05) confirms the significance of these parameters, while Hyd-RO-Dose simulations support calcite saturation control. These findings provide a practical, validated framework for optimizing RO operation by enhancing efficiency and reducing fouling, as well as antiscalant dosing in industrial settings.
Co-Authors Alvika Meta Sari Athiek Sri Redjeki Irfan Purnawan Purnawan M Khoirul Ummam