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All Journal Rekayasa Mesin Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Journal of Research and Technology IJEMS (Indonesian Journal of Environmental Management and Sustainability) Chemistry Indonesian Journal of Chemical Research ASEAN Journal of Community Engagement Abdimasku : Jurnal Pengabdian Masyarakat Nusantara Science and Technology Proceedings Community Empowerment Envirous AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Pengbdian Teknik Mesin Madani: Jurnal Pengabdian Masyarakat dan Kewirausahaan Journal Serambi Engineering (JSE) JURNAL REKAYASA KIMIA & LINGKUNGAN
Pujiastuti, Caecilia
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The Kinetics Reaction of Phosphoric Acid Formation from Cow Bone Pujiastuti, Caecilia; Yustina Ngatilah; Muhammad Septianto; Angelia Tantyono
Journal of Research and Technology Vol. 6 No. 2 (2020): JRT Volume 6 No 2 Des 2020
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v6i2.234

Abstract

Phosphoric acid can be formed from bone waste, including cow bone which contains calcium phosphate. When reacted with sulfuric acid it becomes phosphoric acid. The purpose of this research was to determine the reaction constant of phosphoric acid from cow bones. The reaction constant can determine the good operating conditions in a reactor design. Starting with the cow bones that have been powdered with a size of 200 mesh, dissolved in the water until saturated. Then saturated solution 500 ml was taken and reacted with 4 N sulfuric acid 100 ml, stirring process was carried out at 200 rpm, with variable temperature were (70oC, 80oC, 90oC, 100oC, and 110oC) and time were (40, 50, 60, 70, and 80 minutes). Next, the sample was filtered, and the sediment was taken, and analysed of phosphoric acid filter and separated the sediment. Based on this research, an equation k = 1.1627 e -3742.4 / T was generated. The graph in picture 5 shows that the equation followed a pseudo first order reaction.
REMOVAL IMPURITIS GARAM DENGAN METODE PERTUKARAN ION SECARA BATCH Pujiastuti, Caecilia; Yustina Ngatila
Journal of Research and Technology Vol. 5 No. 1 (2019): JRT Volume 5 No 1 Jun 2019
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v5i1.389

Abstract

Salt is one of the consumer and industrial consumption products that has the maincontent of sodium chloride (NaCl). The present quality of the salt product currentlycontains about 90-93% sodium chloride, and the other is known as an impurities ofcalcium (Ca), magnesium (Mg), potassium (K) and sulfate (SO4) ions. The presence ofthese impurities will decrease the quality of the salt product, so a method is needed todecrease the content of impurities in the salt product. One of the methods that can beused to reduce the levels of impurities such as Ca, Mg, K, and sulfate (SO4) ions in saltsolution is ion exchange method. In this study we studied the effect of cation resinamount (50-150) grams per liter of salt solution and anion solution (150 grams) andcontact time (5-25) minutes on removal of Ca, Mg, K and SO4 ions. The study wasconducted in a stirred tank with a fixed rotation speed of 200 rpm, and the initial qualityof the salt solution contained Ca ions: 0.07%, Mg: 0.09%, K: 0.04% and SO4: 0.4%.Based on the result of the research, the removal of Ca ion: 93.6%, Mg: 78.93%, K:25.00% dan SO4: 85.47 % at condition of cation resin amount: 150 gram/liter andcontact time 25 minutes.
Ceramic Industry Wastewater Treatment by Chemical Coagulation Process Pujiastuti, Caecilia; Egita Yulisningtyas; Ira Pareira
Journal of Research and Technology Vol. 7 No. 2 (2021): JRT Volume 7 No 2 Des 2021
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v7i2.411

Abstract

Ceramic industrial waste contains organic compounds and several heavy metals that exceed the quality standards of ceramic industrial wastewater, therefore the wastewater is treated using the coagulation method. This study uses a coagulant Poly Aluminium Chloride (PAC) with the aim to determine the effect of coagulant mass and stirring time on reducing the content of COD, TSS, lead metal (Pb), and colour. Starting with the waste mixed with PAC has been diluted with a concentration of 1%. Then stirred using a flocculator with a speed of 100 rpm and time (2, 4, 6, 8, and 10 minutes) to form floc. Then it is deposited and separated between the filtrate and the solids. Then the filtrate was analysed. With this analysis, it can be seen that the highest reduction efficiency of TSS levels was 99.9% with a coagulant volume of 12.5 ml at 6 minutes. The highest efficiency of COD levels was obtained at 98.23% with a coagulant volume of 15 ml at 6 minutes. The highest efficiency of waste colour reduction was 99.85% with a coagulant volume of 15 ml at 10 minutes and the efficiency of reducing Pb levels was 99.10% with a coagulant volume of 5ml at 2 minutes, all of which were below the quality standard ceramic industry.  
Development of a Spray Pipe Evaporator for Application on Unproductive Salt Farm Land in Indonesia Muljani, Srie; Sumada, Ketut; Pradana, Alfian Rizki; Pujiastuti, Caecilia
ASEAN Journal of Community Engagement Vol. 8, No. 2
Publisher : UI Scholars Hub

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Abstract

This article discusses the development of a prototype spray pipe evaporator and its efficiency in producing salt in Indonesia. Due to the length of the salt harvesting season in Indonesia, many salt farmers have closed their business doors, leaving many salt ponds abandoned. The spray pipe evaporator prototype was designed to produce a brine solution with a salinity of 23–24 Be from seawater, which has a salinity of 2.5–3.5 Be, in less than 3 days. This is faster than the conventional process of a brine solution salinity of 24 Be. The prototype spray pipe evaporator was assessed in a 20 x 60 m evaporation pool with a depth of 18 cm that contained brine solution with a salinity of 15.5 Be. The number of sprays installed was 11. The salinity increased from 15.5 Be to 20.5 Be after 8.5 hr of evaporation. Meanwhile, with conventional evaporation, the salinity of the brine solution reaches 16.5 Be after 3 days of evaporation. Based on calculations of the evaporation capacity for 11 sprays, it was determined that each spray can evaporate 7.6 m3 of water. A spray pipe evaporator is thus more recommended for evaporation of seawater with a salinity of around 3–5 Be. The ratio of evaporation ponds using spray to evaporation ponds without spray is around 1:15. The technical development conducted in this study improved the evaporation process through spraying, which is applicable for salt pond farming and the salt industry. This technology arguably saves energy for pumps and reduces the number of workers, thus benefitting the salt farmers’ communities in tropical contexts, such as Indonesia.
Optimization of Acetone Concentration and Reflux Ratio for Enhanced Oil Extraction from Spent Bleaching Earth: A Response Surface Methodology Approach Monica, Clarissa Putri; Anggraeni, Verendria Putri Caesar; Sumada, Ketut; Sari, Ni Ketut; Pujiastuti, Caecilia
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 4 (2025): December
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.4.183-191

Abstract

Spent bleaching earth with an oil content exceeding 3% is classified as hazardous and toxic waste, requiring appropriate processing prior to environmental disposal. Extraction is one effective method for processing spent bleaching earth. This study focuses on the optimization of oil extraction from spent bleaching earth using acetone as a solvent, specifically analyzing the effects of solvent concentration and reflux ratio on oil recovery efficiency and evaluating the quality of recovered bleaching earth for potential reuse in vegetable oil refining processes. The extraction method employed was soxhlet extraction using acetone as the solvent. Five different acetone concentrations (50%, 60%, 70%, 80%, and 90%) were tested in combination with five reflux ratios (2, 3, 4, 5, and 6), creating a total of 25 experimental conditions. Response surface methodology (RSM) was utilized to optimize these parameters and identify the ideal conditions for maximum oil recovery. The experimental design and statistical analysis were conducted using Design Expert 13.0.5.0 software. The quality of recovered bleaching earth was assessed against Indonesian National Standards (SNI) for potential reuse applications. The optimization results indicated optimal conditions of 69.15% acetone concentration and a reflux ratio of 4, yielding a maximum oil recovery rate of 17.52%. Analysis of the recovered bleaching earth showed that while it met most SNI standards for bleaching earth quality parameters, the pH remained acidic (below neutral), indicating that alkaline pretreatment would be necessary before the material could be effectively reused in vegetable oil bleaching processes. The study demonstrates that acetone-based soxhlet extraction can effectively recover oil from spent bleaching earth while producing a secondary product suitable for reuse after appropriate pH adjustment.
Penurunan Kadar Pb dan Cd dengan Metode Ion exchange Secara Batch dengan Recycle pada Limbah Cair Industri Cat Nur Suroya, Nala; Anataya Putri Azzahra, Firliandiva; Pujiastuti, Caecilia; Panjaitan, Renova
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Limbah cair merupakan sisa buangan dalam suatu proses yang tidak digunakan lagi. Limbah cair tersebut tidak boleh dibuang sembarangan. Terdapat baku mutu yang mengatur kadar maksimal dalam pembuangan limbah cair. Pengolahan limbah cair perlu dilakukan agar data memenuhi baku mutu tersebut, salah satunya menggunakan metode ion exchange. Metode ion exchange dapat menurunkan kadar logam berat dalam suatu limbah cair. Logam berat tersebut memiliki efek toksik jika terakumulasi dalam tubuh makhluk hidup. Ion exchange menggunakan resin penukar ion untuk menukar logam berat seperti timbal dan kadmium. Resin yang digunakan dalam penelitian adalah resin kation asam kuat Trillite KH 80. Untuk memaksimalkan pertukaran ion variabel yang dijalankan yaitu tinggi resin, laju alir dan recycle. Tinggi resin yang digunakan secara berturut turut 20; 24; 28; 32; 36 cm yang akan dimasukkan dalam kolom penukar ion dengan diameter 7 cm. Laju alir yang digunakan dalam mengalirkan limbah cair yaitu 60; 70; 80; 90; 100 mL/menit. Recycle dilakukan sebanyak 1-3 kali. Logam berat yang diamati yaitu timbal dan cadmium. Hasil penelitian menunjukkan tinggi resin 36 cm, laju alir 60 mL/menit dengan recycle 3 kali merupakan hasil terbaik. Kadar akhir timbal yang didapat sebesar 1,3 mg/L dan kadar akhir cadmium sebesar 0,03 mg/L.
Co-Authors Achmad Rizal Afandi, Fadila Ardiansyah Aisyah Alifatul Zahidah Rohmah Alifah Nur Aini Fajrin Amanda, Nabila Ayu Anataya Putri Azzahra, Firliandiva Angelia Tantyono Anggoro, Achmad Rahditya Viman Anggraeni, Verendria Putri Caesar Anugerah Dany Priyanto, Anugerah Dany Arianti, Rahma Dea Rerindra Arief S, Purwanto Azka, Salsabilla Betafachreza, Aditya Fadhilaskha Egita Yulisningtyas Erfani, Rif’atul Firda Erliyanti, Nove Erliyanti, Nove Kartika Fernanda, Moza Ayu Hafiza, Putri Nur Hamzah, Maditya Amirul Ira Pareira Ketut Sumada Kusuma, Prasdinata Meidaus Lisa Rizky Amalia M. Ghufron Chakim Monica, Clarissa Putri Muhammad Septianto Nana Dyah Siswati, Anwar Zain and Mohammad Ni Ketut Sari Nofitasari, Luluk Novianah, Delia Indah Nur Suroya, Nala Panjaitan, Legipson Pradana, Alfian Rizki Puput Srianah, Puput Srianah Putra, Boni Mulia Putri, Megawati Setiawan Rachmawati, Fadiatul Raka Selaksa Charisma Muchammad Renova Panjaitan Royyan, Irham Alva Soemargono Soemargono SRIE MULJANI Suprianti, Lilik Suprihatin Syahrani, Alza Nadilla Trianna, Nurul Widji Wicaksono, Akhmad Permadi Widya P, Vika Yustina Ngatila Yustina Ngatilah Zain, Tama Rahmandha