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Retno Dewati
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur (UPN), Gunung Anyar, Surabaya 60294, Indonesia
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Improvement of Seawater Salt Quality by Hydroextraction Method Ketut Sumada; Retno Dewati; Suprihatin
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology in Publication, Implementation and Co
Publisher : Future Science

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Indonesia is one of the salt producing countries that use sea water as a source of raw materials, the quality of salt produced is influenced by the quality of sea water. The resulting average salt quality contains 85-90% NaCl. Those salt quality are still below of the Indonesian National Standard (SNI) for human salt’s consumption sodium chloride content is 94.7 % (dry base) and for industrial salt 98,5 %. The improvement of seawater salt quality can be done by several methods: leaching (hydro-extraction), re-crystallization without chemicals or with chemicals, and ion exchangers. In this study we studied the improvement the quality of seawater salt by hydro-extraction method. The objective of this research to improve the quality of seawater salt by hydro-extraction method. The hydro-extraction is a method to improve the quality of salt by washing with saturated salt solution, this method influence by size of salt (diameter), time of hydro-extraction, saturated salt solution concentration and recycle time of saturated salt solution. Based on the results of the research, the hydro-extraction method can produce salt with purity 99,34 % NaCl. The condition is achieved at 30/40 mesh salt size and the time of use of saturated salt solution 5 times.
Precipitated Silica from Pumice and Carnondioxide Gas (Co2) in Bubble Column Reactor Retno Dewati; Suprihatin; Ketut Sumada; Sri Muljani; Meutia Familya; Silviana Ariana
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology in Publication, Implementation and Co
Publisher : Future Science

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Precipitated silica is a silica product, containing silica, a white powder, a large enough porous and nano particle sized. The precipitated silica products are needed to support the operation of various types of industries such as automotive tire industry, rubber industry, cosmetics industry, electronics industry, agriculture and others. This precipitate silica can be produced by a chemical reaction process between the sodium silicate solution and various types of acids such as hydrochloric, sulfuric, acetate and other acids. In this study, the source of silica was obtained from a pumice while precipitation formation was carried out with the use of carbon dioxide gas (CO2). The sodium silicate solution was obtained by extracting the silica contained in a pumice with sodium hydroxide (NaOH) solution and heated to 100C for 1 hours. The carbon dioxide gas is injected into the aqueous solution of sodium silicate in a bubble column reactor and there is a reaction to form a precipitated silica. Based on research results found that the quality of precipitated silica has a quality: white colors, 85-90% silica content, 12-20% aluminum oxide content and surface area 108-227 m2/g. The
Reducing Zinc and Chromium in Wastewater Treatment Biosolid Through Sulfuric Acid Extraction Mu’tassim Billah; Disty Nur Rohmah; Faisal Amri Sholahuddin; Renova Panjaitan; Kindriari Nurma Wahyusi; Retno Dewati
Nusantara Science and Technology Proceedings 3rd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2022.2755

Abstract

The separation of heavy metals, zinc (Zn) and chromium (Cr), in biosolid waste can be carried out by an extraction process using H2SO4 as a solvent. The extraction process was carried out with a variation of time agitation and sulfuric acid concentration. The extracted cake was then analyzed using the atomic absorption spectrophotometry (AAS) method. The most effective reduction in Zn and Cr levels was obtained at 120 minutes and a solvent concentration of 1.5M with an efficiency of 98.80% and 97.89%, respectively.
The Effect of Velocity Gradient and Camp Number on Solids Removal using Bio-Coagulant from Corbula faba Hinds Shells Ardika Nurmawati; Kindriari Nurma Wahyusi; Retno Dewati; Jauhar Hilmy
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 3 No. 2 (2022): IJEISE
Publisher : International Journal of Eco-Innovation in Science and Engineering (IJEISE)

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process in water helps reduce solid content in water. The coagulant destabilizes water pollutants and helps flocs formation with the coagulation process. This paper studies the performance of chitosan bio-coagulant produced from Corbula faba Hinds shells. The velocity gradient and the Camp number of solids removal were also evaluated. The velocity and period of rapid mixing varied from 110 to 150 rpm, and the velocity gradient (G) was 181.2 to 288.5 s-1. The mixing period also ranged from 1 to 5 minutes. The highest TSS and TDS removal resulted in 140 rpm or 260.2 s-1 and 4 minutes of mixing. The residual TSS and TDS decreased with the increase of Camp Number until reaching a point and increased again afterward.
Fermentasi Limbah Kepala Ikan Gabus (Channa striata) dengan Batang Pisang Menjadi Pupuk Organik Cair Faqih Sembada Wijayatin; Farhah Kamilatun Nuha; Retno Dewati
Jurnal Serambi Engineering Vol. 9 No. 4 (2024): Oktober 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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The fish processing industry often produces large amounts of waste. The abundance of these wastes can be used as liquid organic fertiliser so that it would not become pollution. This research will use cork fish head waste which had 17.72% C-organic; 0.189% nitrogen; 0.126% phosphorus; and 0.041 potassium with banana stalks as additional material which had 15.68% C-organic; 1.35% phosphorus; 2.13% potassium; 0.02 nitrogen to be used as liquid organic fertilizer. This research was carried out in 3 stages. The first was the preparation of the main ingredients, followed by the preparation of the bioactivator solution and then the fermentation process. The fermentation process was carried out in 5 different containers, each containing 10, 20, 30, 40 and 50 ml of bioactivator solution. Samples were taken on days 7, 10, 13, 16 and 19 to test for nutrient content. The results showed that the liquid organic fertiliser from cork fish head and banana stem with the best results and meeting the SNI standards was obtained in samples with 30 ml of EM4 added to it and fermented for 10 days, with a C/N ratio of 12.187% and total macro-nutrients (N + P2O8 + K2O) of 5.887%.
Kinetika Reaksi Sintesis Glukosa dari Limbah Padat Yeast (Yeast Mud) Menggunakan Proses Hidrolisis Asam Dimas Nur Arifianto; Rasendriya; Retno Dewati
Jurnal Serambi Engineering Vol. 9 No. 4 (2024): Oktober 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Glucose is usually used in the production of liquid sugar, syrup and as an alternative energy source such as bioethanol. An alternative material for the production of glucose is to use waste residues that can still be used, such as solid yeast waste (yeast sludge) from PT. Energi Agro Nusantara, which has a relatively high carbohydrate content of 31.55%. This research was conducted in 3 stages. The first stage is the preparation of raw materials, followed by the production of liquid glucose by acid hydrolysis method and the determination of reaction order and reaction rate constant. The hydrolysis was carried out at a constant temperature of 900C, stirring speed of 200 rpm, material ratio of 1:10, HCl concentration: 2.5N; 3N; 3.5N; 4N; 4.5N, and hydrolysis time: 60 min; 90 min; 120 min; 150 min; 180 min. The results of the study showed that the glucose synthesis reaction from yeast sludge solid waste followed a pseudo first order reaction, and the glucose content of the hydrolysis results was influenced by the concentration of HCl catalyst and the duration of hydrolysis, which had a directly proportional effect. The highest glucose content obtained was 26% and the reaction rate constant (k) value was 0.0046 at a concentration of 4.5 N HCl with a hydrolysis time of 180 minutes.
MODEL MATEMATIKA ISOTHERMAL BIOSORBEN KULIT LABU KUNING SEBAGAI PENGOLAHAN LIMBAH Pb ARTIFISIAL Setiawan, Jainnul; Rabani, Bagus Ibnu Hiban; Dewati, Retno
Jurnal Teknik Kimia Vol 18, No 1 (2023): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v18i1.4124

Abstract

Kulit labu kuning adalah bahan yang berpotensi untuk dijadikan biosorben karena mempunyai kandungan pektin 24,97% - 47,99%. Tujuan dari penelitian ini yaitu untuk mendapatkan model matematika yang sesuai pada proses adsorpsi limbah Pb artifisial dengan biosorben kulit labu kuning serta mempelajari pengaruh waktu adsorpsi dan massa biosorben terhadap daya adsorpsi biosorben kulit labu kuning dalam penyerapan limbah Pb artifisial. Proses pembuatan biosorben kulit labu kuning meliputi tahap dehidrasi, karbonisasi serta aktivasi. Biosorben yang telah terbentuk kemudian ditambahkan kedalam limbah Pb airtifisial dengan konsentrasi 100 ppm dan diaduk dengan magnetic stirrer selama 15 menit dengan kecepatan 150 rpm dengan variabel massa biosrben 3, 6, 9, 12, 15 gram dengan waktu pengontakan selama 30, 60, 90, 120, 150 menit. Berdasarkan hasil penelitian ini diperoleh hasil terbaik pada waktu 150 menit dengan massa 15 gram diperoleh presentase penurunan Pb sebesar 98,07%. Model matematika yang sesuai pada adsorpsi limbah Pb artifisial dengan biosorben kulit labu kuning adalah model Isoterm Langmuir. Persamaan yang dihasilkan yaitu 0,8415x + 4,4676 dengan nilai R2 = 0,9777.  DOI : https://doi.org/10.33005/jurnal_tekkim.v18i1.4124
ADSORPSI LOGAM TIMBAL PADA LIMBAH CAIR ARTIFISIAL MENGGUNAKAN ARANG AKTIF ECENG GONDOK Andarista, Fanny Feby; Huda, Mukhammad Miftakhul; Dewati, Retno
Jurnal Teknik Kimia Vol 18, No 1 (2023): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v18i1.4122

Abstract

Meningkatnya pembangunan di bidang industri menyebabkan peningkatan jumlah limbah cair yang dihasilkan. Salah satu polutan berbahaya yang terkandung dalam limbah cair adalah logam berat Timbal (Pb). Mengingat bahaya yang diakibatkan oleh logam timbal, maka dilakukan upaya untuk menurunkan kadar logam timbal dengan proses adsorpsi. Eceng gondok merupakan tumbuhan yang sering dianggap sebagai gulma, namun memiliki kandungan selulosa yang tinggi yaitu sebesar 60%. Dalam penelitian ini, eceng gondok dimanfaatkan sebagai bahan baku pembuatan arang-aktif, dimana arang aktif tersebut digunakan sebagai adsorben dalam proses-adsorpsi. Penelitian ini dilakukan untuk mengetahui kemampuan arang aktif eceng gondok dalam mengadsorpsi logam berat timbal pada limbah cair artifisial. Pada proses pembuatan arang aktif, eceng gondok dikarbonisasi pada suhu 300°C selama 30 menit. Arang kemudian diaktivasi dengan Zink Klorida guna meningkatkan kemampuan penyerapan. Proses adsorpsi dilakukan dengan menambahkan arang aktif ke dalam limbah cair artifisial dengan variabel massa adsorben 1, 2, 3, 4, 5 gram dan waktu pengontakan 30, 60, 90, 120, 150 menit. Hasil analisis metode Spektrofotometri Serapan Atom (AAS) diperoleh persentase penyerapan timbal terbaik yaitu sebesar 99,99% pada penambahan massa adsorben 4 gram dengan waktu pengontakan 150 menit. Hal ini menunjukkan bahwa semakin besar massa adsorben dan waktu pengontakan maka semakin tinggi persentaseppenyerapan timbal.  DOI : https://doi.org/10.33005/jurnal_tekkim.v18i1.4122
PEMANFAATAN KITOSAN DARI CANGKANG RAJUNGAN SEBAGAI BIOKOAGULAN PADA AIR LIMBAH INDUSTRI TAHU Windhono, Firman; Dzaky, Muhammad Milzam; Dewati, Retno; Sunarti, AR Yelvia
Jurnal Teknik Kimia Vol 17, No 2 (2023): Jurnal Teknik Kimia
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v17i2.3782

Abstract

Cangkang rajungan mengandung senyawa kitin dan kitosan yang dapat digunakan sebagai biokoagulan, yaitu biopolimer yang dapat digunakan secara komersial untuk membran yang berfungsi sebagai bahan koagulan dan flokulan. Kandungan kitin pada cangkang rajungan mencapai 22,66%. Zat kitin pada cangkang rajungan diproses menjadi biokoagulan untuk menyerap kandungan senyawa organik di dalam limbah produksi tahu, sehingga nilai chemical oxygen demand (COD) di dalam limbah tahu akan berkurang. Konsentrasi COD pada limbah produksi tahu mencapai 1017,35 mg/L, sehingga akan mengakibatkan pencemaran perairan. Penambahan biokoagulan dengan metode koagulasi-flokulasi dapat mengurangi kadar COD. Tujuan penelitian ini adalah untuk mengetahui jumlah dosis optimum dalam pembuatan biokoagulan. Metode penelitian menggunakan tiga tahapan yaitu demineralisasi, deproteinasi, dan deasetilasi. Penelitian dilakukan dengan mengambil sampel limbah dari hasil produksi tahu dan ditambahkan biokoagulan menggunakan metode koagulasi dan flokulasi. Berdasarkan hasil penelitian, diperoleh penambahan biokoagulan 0,4 g:250 ml memiliki efisiensi yang terbaik yaitu 99,5%, sehingga dapat menurunkan kadar COD sebesar 1017,35 mg/L menjadi 4,893 mg/L. Hal ini telah sesuai dengan standar baku mutu yang telah ditetapkan, sehingga pencemaran lingkungan perairan berkurang. DOI : https://doi.org/10.33005/jurnal_tekkim.v17i2.3782
PEMANFAATAN LIGNIN PADA TEMPURUNG KELAPA SEBAGAI ALTERNATIF BAHAN PEREKAT LIGNIN RESORSINOL FORMALDEHIDA (LRF) Alrista Rahmawati; Fioni Ashari Putri; Retno Dewati
JURNAL INTEGRASI PROSES Vol 13, No 1 (2024)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v13i1.25897

Abstract

Tempurung kelapa mengandung 29% lignin, 27% pentosan, dan 26% selulosa. Kandungan lignin yang terdapat dalam tempurung kelapa dapat dijadikan sebagai bahan dasar pembuatan perekat LRF (lignin resorsinol formaldehida). Lignin yang digunakan adalah hasil proses delignifikasi menggunakan pelarut etanol 40%. Perekat LRF dibuat dengan cara mensubtitusikan serbuk lignin hasil isolasi lindi hitam sebesar 2,5; 5; 7,5; 10; dan 12,5 gram dengan perbandingan massa resorsinol dan variasi waktu pemanasan selama 20, 25, 30, 35, dan 40 menit. Tujuan dari penelitian ini adalah membuat perekat LRF kemudian dibandingkan dengan perekat komersial dan syarat mutu perekat pada SNI 06-4567-1998. Dari hasil analisis diperoleh warna perekat LRF berwarna coklat kehitaman yang telah sesuai persyaratan SNI dengan pH sebesar 9,97-11,04, densitas 1,17 – 1,28 g/ml, dan hasil uji daya rekat yang sesuai dengan perekat komersial sebesar 3,65 kg/cm2 pada subtitusi serbuk lignin 2,5 gram dan waktu pemanasan selama 20 menit.
Co-Authors Akren Alvindo Pratama Alrista Rahmawati Andarista, Fanny Feby Ardika Nurmawati Dewa Ayu Made Dearwita Sari Dian Pratiwi Tejo Kusumo Dimas Arnanda Dimas Nur Arifianto Disty Nur Rohmah Dyah Suci Perwitasari Dzaky, Muhammad Milzam Faisal Amri Sholahuddin Faqih Sembada Wijayatin Farhah Kamilatun Nuha Fioni Ashari Putri Huda, Mukhammad Miftakhul Izam Arrazhi Jauhar Hilmy Ketut Sumada Kindriari Nurma Wahyusi Kindriari Nurma Wahyusi Meutia Familya Mu’tassim Billah Nadya Ramadhani Arke Rabani, Bagus Ibnu Hiban Rasendriya Renova Panjaitan S Suprihatin Sani Septianingsih, Dilla Setiawan, Jainnul Shofwatul Athiyah Silviana Ariana Sri Muljani Sunarti, AR Yelvia Windhono, Firman Yonathan Juanto Zulianti, Mei Fifa