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All Journal International Journal of Advances in Applied Sciences Reaktor SPEKTRUM INDUSTRI Jurnal Bahan Alam Terbarukan CHEMICA Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan Jurnal Riset Kimia JURNAL KONVERSI Jurnal Pendidikan Dasar Jurnal Pengabdian Pada Masyarakat Sains Natural: Journal of Biology and Chemistry Jurnal Chemurgy CHEESA: Chemical Engineering Research Articles Jurnal Pengabdian Masyarakat Bumi Raflesia Yumary: Jurnal Pengabdian kepada Masyarakat J-MIND (Jurnal Manajemen Indonesia) Abdimas Indonesian Journal Pelita: Jurnal Pengabdian kepada Masyarakat Indonesian Journal of Chemical Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN
Maryudi Maryudi
Universitas Ahmad Dahlan
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Extraction Of Iron (Fe) as A Valuable Metal Content of Nickel Slag Waste Maryudi, Maryudi; Candra, Syahrul Dwi Adi; Azhar , Muh.; Yahya, Asdarina
Indonesian Journal of Chemical Engineering Vol. 1 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v1i2.658

Abstract

Nickel slag is a product that is formed at high temperatures to form metal alloys that are stable enough. It becomes a challenge for researchers to find methods for extracting valuable metal content.  Leaching is one of the solid-liquid extraction methods that can be applied to separate important elements from a solid material.  By using strong acid solvents. Leaching of ferrous metal (Fe) as the main metal in nickel slags was carried out with a 98% 2M sulfuric acid extracting solution.  Destruction of the leachate of nickel slag was then conducted to simplify the complex elements in the samples so that they could be easily analyzed. Destruction of nickel slag leachate samples was carried out using a destructive solution in the form of nitric acid. The maximum yield of iron content was obtained at a size of 140 mesh and 60 minutes with an iron content of 19,141 ppm. The minimum yield of iron content was obtained at 80 mesh-30 minutes of leaching with an iron content of 18,433 ppm. The maximum recovery results were obtained at 140 mesh-60 minutes of leaching. Factors that can influence include solid sample size, extracting solution, mineral form in solids, complexity, pH, operating temperature, and leaching time.
Optimization of Liquid Organic Fertilizer Production from Tofu Liquid Waste Using EM-4 Activator and Additional Ingredients of Rice Washing Water and Goat Urine Maryudi, Maryudi; Kurniawan, Lutfi; Astuti, Erna; Yahya, Asdarina
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.707

Abstract

Liquid organic fertilizer is organic fertilizer in liquid form which is partly or wholly derived from organic compounds such as plant, animal and industrial waste, either in solid or liquid form. The nutrients contained in it are in the form of a very fine solution so that it is easily absorbed by plants, even the leaves or stems. Organic fertilizer is one solution to restore soil minerals physically, chemically and biologically from the bad effects of synthetic fertilizers. The benefits of liquid organic fertilizer include providing nutrients for plants, improving soil structure, suppressing bacteria that can be detrimental to the soil, and continuous use of soil will improve the physical, chemical and biological properties of the soil as a result being conducive to the environment. In the fermentation process, the role of microbes greatly determines the product produced. The aim of this research is to determine the potential of liquid waste. in the form of liquid organic fertilizer with the addition of goat urine and rice washing water with variations of 15 mL and 30 mL to increase micro and micro nutrients with the bacterial activator EM-4 through a fermentation process. The results of the optimum organic fertilizer content show that the Biological Oxygen Requirement is 969,549 ppm, the Chemical Oxygen Requirement is 14,801.04 ppm and the Total Suspended Solids is 5.360 ppm. Optimal macro nutrient results show Nitrogen 0.2527%, phosphorus 0.1359%, potassium 0.15435%. And the highest degree of acidity (pH) is 4.415. on the first day
Review: Biomassa Sebagai Adsorbent untuk Pengolahan Logam Berat Pada Air Limbah Industri Veranica, Veranica; Rahayu, Aster; Maryudi, Maryudi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Industrial wastewater generally contains heavy metalssuch as lead, cadmium, arsenic, nickel, chromium and mercury. Contamination of water with these elements is very dangerous and will pollute the environment, so a suitable waste water treatment is required. This review aims to find out the efficient methods of handling industrial wastewater and the benefits of biomass. Many scientific methods are used in this regard, including adsorption, chemical precipitation, ion exchange, electrochemical treatment, membrane filtration, coagulation and flocculation. However, some of these techniques have drawbacks such aswill produce a large amount of metal sludge, making it difficult to recycle metal, and the formation of toxic sludge or other wastes. Of all these techniques, adsorption with adsorbent biomasshas been widely known because it is an economical, effective and environmentally friendly processing technique, so this method is suitable for treating industrial wastewater. The use of biomass as an adsorbent is intendedto help reduce dependence on fossil raw materials and greenhouse gas emissions that contribute to climate change.
Peningkatan Kemampuan Masyarakat Desa Tirtonirmolo dalam Pengolahan Limbah Peternakan Menjadi Pupuk Organik Maryudi, Maryudi; Aktawan, Agus
Yumary: Jurnal Pengabdian kepada Masyarakat Vol. 4 No. 3 (2024): Maret
Publisher : Penerbit Goodwood

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35912/yumary.v4i3.2581

Abstract

Purpose: Indonesia is an agricultural country and many people own livestock. Livestock produces solid manure waste that can be converted into organic fertilizers. Livestock waste has not been treated properly, so community service was conducted to overcome this issue. Community service activities were conducted in the form of training on livestock waste processing into solid organic fertilizer and liquid organic fertilizer for members of The Community Self-Reliance Agency (BKM) "Tirtorahayu" Tirtonirmolo Village, Kapanewon Kasihan, Bantul. The products are useful and have high economic value, so they also have the potential to improve the economy of the residents of Tirtonirmolo Village. Research methodology: Community Service activities in the form of socialization and training on the processing of livestock waste into solid organic fertilizer and liquid organic fertilizer for women and gentlemen from the Community Self-Reliance Agency (BKM) “Tirtorahayu” Kalurahan Tirtonirmolo, Kapanewon Kasihan, Bantul. Result: The implementation of community service activities was in the form of socialization and training on processing livestock waste into solid and liquid organic fertilizers. Livestock waste is converted into solid and liquid fertilizers. Limitations: Activities were conducted during the covid-19 pandemic, so there were limited participants to avoid crowding. There were also limited time and interactions with participants Contributions: The villagers were encouraged to improve their skills in handling livestock waste. They have the opportunity to earn income from the production of solid and liquid organic fertilizers.
Treatment of Textile Industrial Wastewater using Membrane Technology: A Review Amillia, Amillia; Maryudi, Maryudi; Chusna, Firda Mahira Alfiata; Hakika, Dhias Cahya; Rahayu, Aster; Santosa, Imam; Mohammed, Hamad Khudhair
CHEESA: Chemical Engineering Research Articles Vol. 7 No. 2 (2024): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v7i2.19132.90-102

Abstract

Textile industry wastewater is a very complex pollutant-containing waste with high dye intensity, requiring proper and appropriate treatment. Membrane technology is one of the appropriate methods for treating textile wastewater due to several advantages such as environmentally friendly and biopolymer-based processing. Therefore, this review aimed to determine the effectiveness of membrane technology and provide information regarding the appropriate treatment of textile wastewater. The articles subjected to review were obtained from several journal sources such as ScienceDirect, Elsevier, Springer, Google Scholar, and national journals. The results showed that several membranes had been used in textile wastewater treatment, such as PTFE (Polytetrafluoroethylene), PES (Polyethersulfone), Polysulfone-Polyvinyl Pyrrolidone Blend Polymer Composite Membrane, CA (Cellulose Acetate), Cellulose Membrane of Sargassum Sp., polysulfone (PSF), Bacterial Cellulose Membrane, and cellulose acetate propionate (CAP). Furthermore, membrane technology was found to reduce dye pollutants in textile wastewater with the highest coefficient value of approximately 97%.
KINETIKA REAKSI KHROM DAN KAPUR PADAM PADA PENGOLAHAN LIMBAH PENYAMAKAN KULIT SECARA BATCH Maryudi Maryudi; Anwaruddin Hisyam
Spektrum Industri Vol. 11 No. 1: April 2013
Publisher : Universitas Ahmad Dahlan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v11i1.1638

Abstract

Kulit merupakan bahan baku untuk produk-produk kerajinan. Sebelum digunakan, kulit melalui proses penyamakan. Sebagaian besar industri penyamakan kulit menggunakan khrom sebagai bahan penyamak. Untuk limbah penyamakan kulit yang mengandung khrom, kadar maksimum yang diperbolehkan sebesar 2,0 mg/L. limbah yang dihasilkan perlu ditangani agar tidak menimbulkan masalah lingkungan. Pemungutan khrom dari limbah cair penyamakan kulit dapat dilakukan dengan mereaksikan dengan kapur padam. Namun kondisi dan kinetika reaksinya belum diketahui secara baik, khususnya reaksi dalam reaktor batch, sehingga perlu dipelajari. Reaksi pemungutan khrom dengan kapur padam dapat dilakukan dalam reaktor slurry tangki berpengaduk secara batch. Mula-mula limbah penyamakan kulit dimasukan kedalam reaktor kemudian diaduk dengan kecepatan tertentu pada suhu kamar. Pada kondisi reaktor telah tercapai kemudian dimasukan kapur padam. Cuplikan diambil setiap selang waktu 3 menit selama 24 menit..Analisis konsentrasi khrom yang tertinggal dijalankan dengan Atomic Absorrption Spectrofhotometer (AAS). Variable yang dipelajari adalah variasi kecepatan pengaduk pada kisaran 140-200 rpm, suhu 30 –60  C, dan perbandingan mol kapur padam dengan mol khrom 1 – 3. Hasil penelitian menunjukkan bahwa reaksi antara kapur padam dengan khrom secara keseluruhan dikendalikan oleh perpindahan massa pada lapisan film cair dan lapisan hasil. Pada suhu 30 – 60 C, konstanta kecepatan reaksi mengikuti persamaan Arrhenius. Kenaikan suhu pada rentang tersebut tidak berpengaruh besar pada nilai difusivitas pada lapisan hasil. Perbandingan mol kapur padam dengan khrom tidak mempengaruhi konstanta perpindahan massa pada lapisan film cair, difusivitas pada lapisan hasil maupun konstanta kecepatan reaksi. Kata kunci: limbah, penyamakan, kulit, khrom, kapur padam, kinetika, reaksi
The Utilization of Nickel Slag and Oyster Shell to Improve the Concrete Strength Selang, Sartika S.; Maryudi, Maryudi; Mufrodi, Zahrul; Widyaningrum, Sri Rahayu
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.1021

Abstract

The increasing mining industry activity will produce increasing industrial waste. Nickel slag is one of the wastes produced from the nickel refining process by-products that have not been optimally utilized. The chemical composition of nickel slag is mostly silica with a percentage of 47.93%. Silica can be used as a material for making concrete, where a high percentage of silica is expected to strengthen the concrete structure. This study was conducted to determine the effect of nickel slag on the compressive strength of concrete and the right composition in the concrete mixture. The research method used an experimental method with different nickel slag compositions (0%, 5%, 10%, 15%, and 20%) with concrete compressive strength testing at the age of 28 days. The results of the concrete compressive strength test were that the higher the nickel slag content, the higher the compressive strength and flexural strength of the concrete. The addition of shells with different variations (0%, 5%, 10%, 15%, and 20%) showed that the best results were with the addition of 10% shells with a compressive strength of 28.1 MPa. Meanwhile, the water absorption capacity with the lowest absorption power was obtained by adding 20% ​​nickel slag, which was 8.95 %.
Recycle Limbah Plastik Jenis PET (Polyethylene Terepthalate) dengan Proses Pirolisis dengan katalis Silika-Alumina Salamah, Siti; Maryudi, Maryudi
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.11954

Abstract

Limbah/ Sampah plastik di dunia semakin meningkat setiap tahunnya, bahkan hingga menyentuh angka yang sangat mengkhawatirkan. Sampah yang paling banyak ditemukan adalah jenis PET. Selain itu ketahanan energi saat ini perlu diperhatikan juga, sehingga teknologi dalam mengkonversi sampah menjadi energi dengan proses pirolisis penting dilakukan. Penelitian ini dilakukan dengan menggunakan bahan baku sampah PET berupa botol bekas yang berasal dari sekitar dengan katalis berupa katalis SiO2/Al2O3 berbentuk butiran. Penelitian dilakukan dengan reaktor fixed bed berbahan stainlees steel yang dilengkapi dengan condensor. Penelitian dilakukan dengan pengecilan ukuran plastik PET (1-2 cm) dan proses pirolisis dilakukan pada suhu 450 oC pada waktu 2 jam dengan variabel berat katalis tetap yaitu 4,8,12 dan 16 gram. Produk pirolisis dianalisis dengan FTIR (F tranfor Infra Red) dan Gas Kromatografi MS-Pac. Dari penelitian ini dihasilkan produk pirolisis berujud gas dan cairan yang dalam yang temperatur ruangan berujud padatan berwarna kuning, dengan titik lebur 90 0 C. Pirolisis optimal terdapat pada suhu 450 OC dengan katalis 1 % berat umpan 400 gr diperoleh yield 14 %. Hasil analaisi FTIR (Fourier Transform Infrared Spectroscopy) menunjukkan dalam produk mengandung gugus benzene, gugus karbonil, gugus ester, gugus hidroksil. Kandungan senyawa yang paling dominan pada hasil analisis GC-MS adalah asam benzoate 71 %, yang merupakan monomer dari PET dan senyawa turunan asam benzoate ( toluene dan isomernya ) 15 %,Biphenil 4 % dan triphenil 7 %
Proses Pirolisis Limbah Styrofoam Menggunakan Katalis Silika-Alumina Salamah, Siti; maryudi, maryudi
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 1 (2018): Jurnal Rekayasa Kimia & Lingkungan (June, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i1.8695

Abstract

Sampah styrofoam dapat diolah dengan cara didaur ulang menjadi beberapa produk. Salah satunya adalah teknik pirolisis. Penelitian ini bertujuan untuk mempelajari pengaruh katalis yang efektif dan murah dalam pirolisis. Hasil penelitian pirolisis dengan katalis zeolit alam masih mengandung senyawa benzena dan toluena cukup tinggi, dengan katalis Ni/ Si menunjukkan hasil lebih bagus dan peningkatan yieldnya,namun katalis Ni/Silika cukup mahal. Pirolisis ini diharapkan dapat diaplikasikan di masyarakat sehingga perlu penelitian untuk mencari katalis yang murah dan efektif, agar ikatan rangkap pada benzena dan toluena dapat direngkah menjadi senyawa hidrokarbon rantai terbuka yang dapat digunakan bahan bakar. Penelitian ini dilakukan dengan menimbang sampel 130 gr dengan ukuran kecil dimasukkan ke reaktor, dicampur dengan 13 gr katalis silika alumina, pirolisis dijalankan pada suhu 460 C ,waktu 120 menit. Percobaan diulang dengan variabel berat katalis 26, 39, 52 dan 65 gram. Hasil pirolisis dengan yield optimal digunakan untuk pirolisis variabel suhu operasi. Dekomposisi sampel diuji dengan metode Thermogravimetri Analyzer (TGA). Kandungan senyawa Hasil Cairan Pirolisis (CHP) dianalisis dengan KromatografiMas Pec, CHP diuji karakteristik bahan bakarnya dan uji kalor. Dari penelitian ini dapat disimpulkan styrofoam dapat dipirolisis dengan katalis silika alumina menghasilkan cairan yang bersifat mudah terbakar (flammable) jenis bahan bakar kategori solar jenis 51. Suhu dekomposisi styrofoam pada 300500 C. Yield yang optimal 95,65%, diperoleh dengan berat katalis 26 gr. Suhu Optimal pirolisis pada 500 C. CHP meningkat dengan meningkatnya suhu dan akan mencapai maksimal pada T=500 C. CHP mengandung beberapa senyawa yaitu stirena, toluena, aldehid, isopropil benzena, diphenil, alkohol dan alkana.
Evaluation and Comparison Anti-aging Facial Serum from Algae Extract Permadi, Adi; Aziz, Abdul; Ramadani, Noorpani; Nazzal, Sami; Maryudi, Maryudi; Suharto, Totok Eka
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27898

Abstract

The demand for cosmetics in Indonesia is quite high so cosmetics can now be said to be a primary need. Therefore, various cosmetic products have emerged that are cheap and provide instant results but ignore the health aspects of the user. Several cosmetic products make a breakthrough by using natural ingredients. One natural material that can be used is microalgae which can produce bioactive compounds and has a relatively faster production process compared to other natural materials. In this research, the microalgae used were Chlorella sp. and Spirulina sp., and Sargassum sp. This research aims to make a serum based on the Chlorella sp., Spirulina sp. and Sargassum sp. microalgae. The research results showed that the standard testing of simplicial facial serum extracts of Spirulina sp., Chlorella sp., and Sargassum was by SNI No. 16-4399-1996.[ASUS1] [AP2]  All the metrics analyzed, such as organoleptic characteristics, pH, specific gravity, viscosity, active compounds, and microbiological contamination, have successfully fulfilled the required requirements in SNI no. 16-4399-1996.. The results of antioxidant activity testing showed that Chlorella sp. had higher antioxidant activity than the other three types of samples. However, the antioxidant results obtained are still very low and relatively weak, which means this serum does not fully contribute to antiaging. Further research needs to be carried out to obtain serum from microalgae with high levels of antioxidants, including by using fresh simplicia, elevated algae concentration or optimizing the operating conditions.     [ASUS1]Please add short information about the main results, whether the serum satisfies the standard or not, which parameters, etc. [AP2]Has been added
Co-Authors Abdul Aziz Achmad Saidi Noor Adi Permadi Adi Permadi Adi Permadi, Adi Agus Aktawan, Agus Amelia, Shinta Amilia Amilia, Amilia Amillia, Amillia Anugrah, Nawang Anwaruddin Hisyam Anwaruddin Hisyam Arif Dwi Anto Azhar , Muh. Azizah, Isti Nur Baswara, Ahmad Raditya Cahya Candra, Syahrul Dwi Adi Chusna, Firda Mahira Alfiata Dewi, Kartika Tunggal Dhias Cahya Hakika Dimas, Doni Dwi Anto , Arif Erna Astuti Farah Fadillah Hanum Farrah Fadhillah Hanum Fatma Nuraisyah, Fatma Firdaus, Stradivary Maulida Hakim, Muhammad Arif Lukman Hanum, Farrah Fadhillah Hapsari, Intan Tri Hayuningtyas, Ratih Hendry Pangestu Hisyam, Anwaruddin Imam Santosa Irwan Mulyadi Ismanto, Deny Isti Nur Azizah Kurniawan, Lutfi Loundi Vidinda , Oktaza Lukhi Mulia Shitophyta Lutfi Firmansyah, Lutfi Matriadi, Faisal Mohammed, Hamad Khudhair Mufti Khakim, Mufti Muhammad Hakiim Marzun Muhammad Kresna Islami Muhtar Hamdan, Muhtar Munawaroh, Annisa Luthfiana Nafira Alfi Zaini Amrillah Nazzal, Sami Ninda Puspita Sari Novia Rahmawati Nur Halimah Nuraini Nuraini Oktaza Loundi Vidinda Padya, Syaeful Akbar Pratiwi, Margaretha Herlin Rahayu, Aster Rahman, Zulfan Hanif Ramadani, Noorpani Ramadhan, Muhammad Kaisar Sutomo Refah Syauqi Sari, Ninda Puspita Satria, Puji Selang, Sartika S. Sembiring, Nisya Silvani Shinta Amelia Shitopyta, Lukhi Mulia Sinaga, Alexander Maruli Tua Siti Jamilatun Siti Salamah Siti Salamah Siti Salamah Siwi Purwanti Soedjatmiko Sofiana, Nurani Sofyan Hadi Sriyana, Ida Sugiatno Sugiatno Suhendra Suhendra Suradi, Siti Samahani Totok Eka Suharto Veranica Veranica, Veranica W, Mila Utami Wardana, Mikael Dia Widyaningrum, Sri Rahayu Yahya, Asdarina Zahrul Mufrodi, Zahrul Zufar, Ahmad Fatwa