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All Journal Rekayasa Mesin Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat AGRITEPA: Jurnal Ilmu dan Teknologi Pertanian Jurnal IPTEK Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Journal of Research and Technology SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan IJEMS (Indonesian Journal of Environmental Management and Sustainability) Chemistry Indonesian Journal of Chemical Research ASEAN Journal of Community Engagement G-Tech : Jurnal Teknologi Terapan 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 JURNAL REKAYASA KIMIA & LINGKUNGAN
Pujiastuti, Caecilia
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Recovery of Silica from Steel Slag Waste Using Extraction and Acid Precipitation Methods Betafachreza, Aditya Fadhilaskha; Putra, Boni Mulia; Pujiastuti, Caecilia
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 3 (2025)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v9i3.793

Abstract

Steelmaking processes generate large amounts of slag waste that contain silica, which can be recovered and converted into valuable products. In this study, silica (SiO?) was extracted from steel slag waste through alkaline extraction using sodium hydroxide (NaOH) followed by acid precipitation. The experimental parameters included NaOH concentrations of 0.5, 1.0, 1.5, 2.0, and 2.5 M, and extraction temperatures of 60, 70, 80, 90, and 100 °C. Each extraction was carried out for 60 minutes with continuous stirring at 300 rpm. The X-ray diffraction (XRD) analysis confirmed that the product exhibited a broad peak at 2? around 20–30°, which is characteristic of amorphous silica. The results indicated that both NaOH concentration and temperature had a positive correlation with silica yield. As the NaOH concentration and extraction temperature increased, the percentage of extracted silica also increased. The optimum condition was achieved at 100 °C and 2.5 M NaOH, yielding silica with a purity of 91.10%. These findings highlight the potential of utilising steel slag waste as a low-cost raw material for producing amorphous silica. Furthermore, the process demonstrates a sustainable approach to waste valorization while providing high-purity silica for potential applications in industrial materials, adsorbents, and nanotechnology. Contribution to Sustainable Development Goals (SDGs):SDG 12: Responsible Consumption and ProductionSDG 13: Climate ActionSDG 15: Life on Land
The Effectiveness of Sodium Hydroxide Precipitation in Impurity Removal during NaCl Recovery from Bittern Waste Water Puspitasari, Indah Maharani; Putra, Andreansyah Brilliant; Pujiastuti, Caecilia; Panjaitan, Renova
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.8082

Abstract

Recovery of sodium chloride (NaCl) from bittern, a by-product of salt production, is often hindered by impurities such as Mg²⁺ and Ca²⁺, which reduce NaCl purity. This study evaluated the effect of sodium hydroxide (NaOH) concentration and stirring time on NaCl recovery, using NaOH concentrations of 4.6 until 8.02 N and stirring durations of 20 until 60 minutes at a constant stirring speed of 300 rpm. The process involved NaOH addition, stirring, filtration of precipitates, and NaCl crystallization. Parameters such as impurity levels, pH, NaCl purity, and recovery percentage were analyzed. Results indicated that higher NaOH concentrations and longer stirring times generally decreased impurity levels and improved NaCl recovery. Optimal conditions 5.8 N NaOH and 50 minutes stirring yielded an impurity level of 0.0359%, NaCl purity of 89.61%, and a recovery rate of 85.57%. This study presents a novel approach by optimizing NaOH concentration and stirring time parameters to effectively minimize divalent ion contamination, thereby enhancing NaCl recovery from bittern. The findings have direct applicability in improving the efficiency of salt recovery processes in coastal salt industries, contributing to more sustainable salt production systems.
Study on the Effectiveness of CO2 Absorption in Biogas Purification Using Bittern and Alkaline Solutions Hafiza, Putri Nur; Amalia, Felisa Rizky; Suprihatin; Pujiastuti, Caecilia; Triana, Nurul Widji
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 3 (2025)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v9i3.801

Abstract

Biogas is a renewable energy source with great potential to replace fossil fuels; however, the presence of CO? and H?S reduces its quality and combustion efficiency, making purification necessary. This study aimed to evaluate the effectiveness of CO? absorption using Bittern and alkaline solutions (3N KOH, 3N NaOH) with absorbent volumes ranging from 600 to 1000 ml. The absorption process was carried out in a bubble column, and the gas composition was analyzed using an Orsat apparatus and titration method. The results indicated that increasing absorbent volume reduced CO? concentration to 10–15% and H?S to below 1.2%, while increasing CH? content to more than 80%, in accordance with SNI 8019:2014 biogas standards. Stepwise absorption (Bittern–KOH/NaOH) was more effective than single absorbents, yielding up to 87% CH? and reducing CO? to 10%. XRF analysis of the precipitate showed calcium (84.58%) and magnesium (14%) dominance, confirming carbonate and sulfate precipitation. These findings demonstrate that Bittern and alkaline solutions are effective absorbents for biogas purification, with stepwise absorption providing the most optimal improvement in biogas quality. Contribution to Sustainable Development Goals (SDGs):SDG 7: Affordable and Clean EnergySDG 13: Climate Action
Inovasi Kemasan Produk Kerupuk Kulit Kopi di Desa Galengdowo, Kabupaten Jombang Royyan, Irham Alva; Pujiastuti, Caecilia
ABDIMASKU : JURNAL PENGABDIAN MASYARAKAT Vol 7, No 1 (2024): JANUARI 2024
Publisher : LPPM UNIVERSITAS DIAN NUSWANTORO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/ja.v7i1.1910

Abstract

Usaha Mikro Kecil dan Menengah (UMKM) merupakan sektor ekonomi yang sangat penting bagi negara, karena berperan sebagai tulang punggung perekonomian yang menyangkut kehidupan banyak orang. Salah satu tantangan yang dihadapi UMKM adalah kurangnya sumber daya dan pengetahuan untuk mengembangkan desain kemasan yang menarik dan fungsional. Kemasan memiliki peran penting dalam menentukan harga jual serta citra dari produk. Harga jual meningkat saat kemasannya menarik, dan citra produk menjadi lebih baik di mata konsumen jika dikemas dengan baik. Metode pengabdian kepada masyarakat ini meliputi survei, wawancara, dan analisis data untuk mengumpulkan informasi tentang praktik produksi kerupuk kulit kopi di Desa Galengdowo serta persepsi konsumen terhadap kemasan produk. Hasil penelitian menunjukkan bahwa inovasi kemasan yang fokus pada aspek estetika, keamanan pangan, dan fungsionalitas dapat menjadi strategi efektif untuk meningkatkan daya saing produk. Studi ini dapat menjadi acuan bagi pelaku industri kecil dan menengah di sektor serupa untuk mengoptimalkan inovasi kemasan produk guna meningkatkan daya saing dan nilai tambah produk lokal.
KINETIKA REAKSI PEMBENTUKAN TRIKALSIUM PHOSPHATE (Ca3(PO4)2) DARI KALSIUM KARBONAT BERBAHAN BAKU CANGKANG KUPANG PUTIH Pujiastuti, Caecilia; Nofitasari, Luluk; Erfani, Rif’atul Firda
Journal of Research and Technology Vol. 6 No. 1 (2020): JRT Volume 6 No 1 Jun 2020
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v6i1.149

Abstract

The development of the health sector to search alternatife material bone’s repair is increasing. Bone is a natural composite containing 60% minerals, 30% matrix, and 10% water. The component of bone mineral is calcium phosphate. Tricalcium phosphate is the type of calcium phospate that used because it has chemical component’s as like bone’s component. In this study, white mussel shell was chosen as a source of calcium and H3PO4 as a solvent. The aim of this research was determining reaction kinetics of tricalcium phospate synthesis from white mussel shells. The research was started by dissolving 50 grams of white mussel shell in 1 L of H3PO4 3% at reaction time with variation 2, 4, 6, 8, 10 minutes and reaction temparature with variation 40, 50, 60, 70, 80oC and then filtered. The filtrate was analyzed for the content of phosphoric acid while the residue was calcined at 900oC for 5 hours to remove the water. The reaction rate increased with increasing time and temperature. The highest phosphate acid conversion was obtained at a temperature of 80 ° C, with a reaction time of 10 minutes is 90.92%. The controlling step that controlled tricalcium phosphate synthesis from white mussel shell followed pseudo first-order equation with the Arrhenius equation.The results of XRD analysis found that89%of Ca3(PO4)2was formed.
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.  
Pemanfaatan lahan tidur untuk budidaya serai wangi di Kosagrha Lestari Medokan Ayu Selatan, Rungkut Susilowati, Susilowati; Djarwatiningsih, Djarwatiningsih; Panjaitan, Renova; Putra, Sandy Buana; Wahyusi, Kindriari Nurma; Pujiastuti, Caecilia; Moenandar, Siswanto
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 8, No 1 (2024): March
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v8i1.21616

Abstract

AbstrakKeberadaan lahan tidur di daerah pemukiman dapat menjadi sumber permasalahan bagi warga karena menjadi sarang hewan liar yang tentunya mengganggu kenyamanan masyarakat setempat. Lahan tidur di wilayah Kosagrha Lestari merupakan lahan milik pemerintah kota yang telah lama terbengkalai, ditumbuhi oleh rerumputan liar serta penuh dengan sampah-sampah seperti sampah sisa bangunan, sampah plastik dan botol-botol. Tim Pengabdian kepada Masyarakat (PkM) dari Universitas Pembangunan Nasional “Veteran” Jawa Timur (UPNVJT), dalam program pengabdian kepada masyarakat, bekerjasama dengan Kelompok Tani Kosagrha Lestari memanfaatkan lahan tidur tersebut menjadi lahan budidaya tanaman serai wangi. Pendekatan program pengabdian yang dilakukan adalah melakukan aksi (action) yang kemudian diikuti dengan diskusi tanya jawab dalam forum resmi (talk show). Hasil dari pengabdian masyarakat dengan metode pendekatan yang dilakukan adalah bahwa masyarakat memiliki ketertarikan dan kepercayaan lebih terhadap program yang sebelumnya terbukti berhasil dilakukan. Teknik budidaya yang disarankan dapat diaplikasikan pada lahan tidur di Kosagrha dan menghasilkan lahan budidaya serai wangi yang tumbuh dengan baik. Kata kunci: lahan tidur; pupuk kandang; serai wangi; teknik budidaya Abstract Unused land in residential areas can be a problem source for residents because it becomes a nest for wild animals, which disturbs the local community's comfort. The idle land in the Kosagrha Lestari area, which belongs to the government, has been neglected for a long time, overgrown with weeds and full of rubbish such as building waste, plastic waste, and bottles. The community servise team of UPNVJT collaborated with the Kosagrha Lestari Farmers Group in a community service program, utilizing that idle land to become citronella cultivation land. The service program's approach was taking action followed by a question-and-answer discussion in an official forum (talk show). The results of this community service activity using the approach method were that the community had more interest and trust in a program with successful evidence. The cultivation technique suggested could be applied to the unused land in Kosagrha and generate a well-cultivated land of citronella. Keywords: unused land; manure; citronella; cultivation technique
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

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

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.
Co-Authors Achmad Rizal Afandi, Fadila Ardiansyah Alwansyah, Yuki Amru Amanda, Nabila Ayu Angelia Tantyono Anggoro, Achmad Rahditya Viman Anggraeni, Verendria Putri Caesar Annisa Anwar, Miranda Anugerah Dany Priyanto, Anugerah Dany Arianti, Rahma Dea Rerindra Arief S, Purwanto Aththobarani, Muhammad Daffa' Azka, Salsabilla Betafachreza, Aditya Fadhilaskha Chakim, M. Ghufron Djarwatiningsih, Djarwatiningsih Egita Yulisningtyas Erfani, Rif’atul Firda Erlinda, Riska Melati Erliyanti, Nove Erliyanti, Nove Kartika Fadilah, Muhammad Fajrin, Alifah Nur Aini Fernanda, Moza Ayu Hafiza, Putri Nur Hamzah, Maditya Amirul Hidayah, Bimantara Ira Pareira Ketut Sumada Caecillia Pujiastuti Kindriari Nurma Wahyusi Kusuma, Prasdinata Meidaus Lisa Rizky Amalia Maharani, Hijria Putri Moenandar, Siswanto Monica, Clarissa Putri Muchamad, Raka Selaksa Charisma Muhammad Septianto Nana Dyah Siswati, Anwar Zain and Mohammad Ni Ketut Sari Nofitasari, Luluk Novianah, Delia Indah Panjaitan, Legipson Panjaitan, Renova Pertiwi, Beta Cahaya Pradana, Alfian Rizki Puput Srianah, Puput Srianah Puspitasari, Indah Maharani Putra, Andre Yusuf Trisna Putra, Andreansyah Brilliant Putra, Boni Mulia Putra, Sandy Buana Putri, Megawati Setiawan Rachmawati, Fadiatul Rizqullah, Rafitrah Rohmah, Aisyah Alifatul Zahidah Royyan, Irham Alva Soemargono Soemargono SRIE MULJANI Suprianti, Lilik Suprihatin Susilowati Susilowati Syahrani, Alza Nadilla triani, nova Trianna, Nurul Widji Wicaksono, Akhmad Permadi Widya P, Vika Wira, Guardiola Rosa Yustina Ngatila Yustina Ngatilah Zain, Tama Rahmandha