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All Journal Jurnal Informatika dan Teknik Elektro Terapan Budimas : Jurnal Pengabdian Masyarakat Journal of Energy and Electrical Engineering (JEEE) Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Mutiara Elektromedik Jurnal Ilmiah Dan Karya Mahasiswa Journal Serambi Engineering (JSE)
Mahardira Dewantara
Universitas Muhammadiyah PKU Surakarta
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Analysis of COD and BOD5 at the Inlet and Outlet of the Wastewater Treatment Plant (WWTP) at Hospital X Sunardi; Fakhrizal Falah; Argoto Mahayana; Sumardiyono; Nur Hidayati; Soebiyanto; Mahardira Dewantara
Jurnal Serambi Engineering Vol. 9 No. 4 (2024): Oktober 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Hospitals are one of the service facilities that produce large amounts and quality of liquid waste that requires special attention because it contains hazardous materials for public health and the environment. This study aims to determine the quality of COD and BOD effluents in X Hospital. The type of research used is observational with a descriptive approach. The sampling technique used was purposive sampling, where wastewater samples were taken from two points, namely the inlet and the outlet of the WWTP. Based on the results of the laboratory analysis of the wastewater samples from Hospital X, it can be concluded that the average COD value at the inlet of the WWTP was 64.04 mg/L, while the average COD value at the outlet of the WWTP was 47.90 mg/L, and the average BOD value at the inlet was 12.69 mg/L, while the average BOD value at the outlet was 1.60 mg/L. All of these values are qualified according to the Hospital Activity Liquid Wastewater Quality Standards based on Central Java Province Regional Regulation No. 5 of 2012. It is expected that Hospital X will continue to maintain the wastewater treatment plant.
Rancang Bangun Thermohygrometer dengan Sensor Pemantauan Gas Medik Berbasis Internet Of Things (IoT) Setyo Adi Nugroho; Yuli Siyamto; Fitri Anindyahadi; Mahardira Dewantara
Jurnal Ilmiah Dan Karya Mahasiswa Vol. 3 No. 1 (2025): JURNAL ILMIAH DAN KARYA MAHASISWA (JIKMA)
Publisher : Institut Teknologi dan Bisnis (ITB) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54066/jikma.v3i1.2867

Abstract

A thermohygrometer is a device used to measure temperature, humidity, and the concentration of medical gases (CO and CO₂) in operating rooms. The temperature in an operating room should be maintained between 19°C and 24°C, and humidity between 45% and 65%, to prevent damage to electronic equipment and corrosion caused by low temperatures and high humidity. Medical gases containing oxygen can also accelerate corrosion. Therefore, a thermohygrometer equipped with medical gas readings is necessary. This study aims to design a thermohygrometer using a DHT22 sensor to measure temperature and humidity and an MQ-135 sensor to detect CO and CO₂ gases. The obtained data is displayed on an I2C LCD screen and sent to the Blynk application via WiFi using an ESP32. Testing shows a temperature reading error of -0.02%, humidity -0.02%, CO gas 0.32%, and CO₂ -0.16%, all within a tolerance limit of ±5%.
Design of Sterilizer Calibration With Esp8266 Based on Internet of Things Anindyahadi, Fitri; Nugroho, Setyo Adi; Dewantara, Mahardira; Suyamto, Yuli
Journal of Energy and Electrical Engineering Vol 6, No 2: April 2025
Publisher : Teknik Elektro Universitas Siliwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37058/jeee.v6i2.14927

Abstract

Advancing technology demands reliable monitoring of key indicators such as temperature, a fundamental measure of heat or cold and critical wherever stable setpoints are required. Guided by Industry 4.0 principles, this study develops an Internet-of-Things (IoT) sterilizer calibration tool using an ESP8266 controller for real-time access. The device was built as planned, from component selection and casing design to the accompanying application, and supports continuous temperature observation. The IoT layer simplifies data acquisition and provides reliable, real-time monitoring via the ESP8266. Experimental evaluation shows small deviations from setpoints: at 150 °C the mean error is 0.5 °C, and at 200 °C the mean error is 0.1 °C. Testing followed the Medical Device Calibration Work Method No. 044-18 (2020) for sterilizer performance. All results remain within the permitted tolerance of ±5 °C, indicating that the tool is suitable for use and can assist applications that require stable, precisely monitored temperature conditions.
Pemanfaatan Scrap Besi untuk Reduksi Krom Heksavalen Limbah Cair Industri Pelapisan Logam Sunardi, Sunardi; Mahayana, Argoto; Sumardiyono, Sumardiyono; Gunawan, Lucia Sincu; Hidayati, Nur; Soebiyanto, Soebiyanto; Dewantara, Mahardira; Afghohani, Afif
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 3 (2025): Edisi Juli - September
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v6i3.6600

Abstract

Kegiatan pengabdian kepada masyarakat ini bertujuan untuk menerapkan hasil penelitian pemanfaatan limbah scrap besi sebagai agen pereduksi kromium heksavalen (Cr(VI)) dalam limbah cair industri pelapisan logam skala kecil. Lokasi kegiatan berada di industri pelapisan logam Gemilang Chrome, Jl. Raya Palur Km. 7,5 Solo, yang belum memiliki sistem pengolahan limbah cair berbahaya secara memadai. Metode yang digunakan meliputi survei lapangan, wawancara dengan pemilik dan operator industri, pengambilan dan analisis sampel limbah, pelatihan teknologi tepat guna, serta implementasi langsung teknologi reduksi Cr(VI) menggunakan scrap besi dalam skala sederhana. Hasil kegiatan menunjukkan bahwa scrap besi mampu mereduksi kadar Cr(VI) hingga 87,5% dalam kondisi optimum pH 3 dan waktu kontak 90 menit. Selain efisiensi teknis, terjadi peningkatan pengetahuan dan keterampilan mitra dalam pengelolaan limbah berbahaya secara mandiri dan murah. Temuan ini menunjukkan bahwa scrap besi tidak hanya berfungsi sebagai agen remediasi yang efektif, tetapi juga sebagai solusi aplikatif berbasis prinsip ekonomi sirkular yang relevan untuk diterapkan pada industri pelapisan logam berskala UMKM. Kegiatan ini sekaligus membuktikan bahwa hasil riset laboratorium dapat diadaptasikan dalam konteks pengabdian masyarakat yang nyata, berkelanjutan, dan berdaya guna.
RANCANG BANGUN ALAT KALIBRATOR BLACKBODY BERBASIS ARDUINO NANO MENGGUNAKAN KONTROL PID Nugroho, Setyo Adi; Dewantara, Mahardira; Anindyahadi, Fitri
Jurnal Informatika dan Teknik Elektro Terapan Vol. 14 No. 1 (2026)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v14i1.8588

Abstract

Termometer yang digunakan secara terus menerus, terjatuh, atau terbentur dapat mengalami kerusakan hingga dapat menimbulkan dampak yang serius seperti penurunan kualitas hasil pengkurunnya. Oleh karena itu, termometer membutuhkan kegiatan kalibrasi secara berkala untuk memastikan tingkat ketelitian dan ketepatan yang dimilikinya bernilai tinggi dengan menggunakan alat kalibrator blackbody. Tujuan dari penelitian ini adalah membuat rancang bangun alat kalibrator blackbody berbasis arduino nano menggunakan kontrol PID dan melakukan penelitian tingkat keakurasian hasil pengukuran alat kalibrator blackbody berbasis arduino nano menggunakan kontrol PID. Metode yang digunakan pada penelitian ini adalah Research and Development (RnD). Metode RnD adalah salah satu metode penelitian yang digunakan untuk menghasilkan sebuah produk tertentu melalui beberapa tahapan penelitian dan pengujian efektivitas produk tersebut. Dari hasil pengujian pengukuran, nilai akurasi pada pengujian parameter setting suhu 35°C adalah 99,41%. Nilai akurasi pada pengujian parameter setting suhu 37°C adalah 99,97%. Nilai akurasi pada pengujian parameter setting suhu 41°C adalah 99,85%.
The Effect of H2SO4 Concentration on the Yield and Purity of Zinc Sulfate in the Synthesis of Zinc Sulfate from Zinc Waste , Sunardi; , Sumardiyono; Mahayana, Argoto; Hidayati, Nur; , Soebiyanto; Dewantara, Mahardira; Afghohani, Afif
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Zinc waste is a type of waste that comes from the use or production of zinc metal. Zinc waste is widely used in the production of paint, ceramics, glass, lamps, and pesticides. Zinc waste is very dangerous if not properly processed/utilized. If disposed of in large quantities into waterways, zinc waste can cause environmental pollution. Zinc waste is actually needed in water, but only in very small amounts. If the zinc content in water exceeds the specified threshold, it will be dangerous and toxic to living organisms. Excess zinc waste will damage the aquatic and soil ecosystems, which will certainly also have an impact on the health of living creatures and pose health risks to humans, such as digestive disorders and damage to certain organs. To reduce the amount of zinc waste, it is necessary to synthesize zinc waste into zinc sulfate. The purpose of this study was to determine the effect of sulfuric acid concentration on the yield and purity of zinc sulfate from zinc waste. The synthesis process includes pre-treatment, which is carried out by reducing the size of the zinc waste, then soaking the zinc waste in hydrochloric acid (HCl) to dissolve the oxide layer contained in it, cleaning the zinc surface of crusts, and separating the zinc from its mixture. Then, the synthesis process is carried out using a sulfuric acid (H2SO4) solution with varying concentrations (20%, 30%, 35%, and 45%) with heating at a temperature of 75-80° C and stirring at a speed of 300-350 rpm. Filtration is then carried out, and the filtrate obtained is heated until the solution becomes saturated, followed by a crystallization process. It is cooled to room temperature, and zinc sulfate crystals are obtained. In this study, white zinc sulfate heptahydrate (ZnSO4.7H2O) was obtained using a 45% sulfuric acid (H2SO4) solution, yielding a weight of zinc sulfate heptahydrate (ZnSO4.7H2O) of 3.1729 grams, a ZnSO4.7H2O concentration of 52.80% and the purity level of ZnSO4.7H2O was 96.28%.
ANALISIS KESESUAIAN PENGUKURAN SENSOR SUHU INKUBATOR BAYI MENGGUNAKAN METODE BLAND-ALTMAN Khamdan Annas Fakhryza; Safira Fegi Nisrina; Efa Yumna Purwono; Mahardira Dewantara
JURNAL MUTIARA ELEKTROMEDIK Vol. 10 No. 1 (2026): Jurnal Mutiara Elektromedik
Publisher : Prodi Teknik Elektromedik Universitas Sari Mutiara Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51544/elektromedik.v10i1.6169

Abstract

Latar belakang: Inkubator bayi berfungsi menjaga Neutral Thermal Environment (NTE) pada neonatus, sehingga akurasi sensor suhu menjadi faktor kritis dalam stabilitas sistem kontrol termal. Degradasi sensor akibat penggunaan jangka panjang berpotensi menimbulkan deviasi pengukuran yang tidak terdeteksi melalui kalibrasi rutin. Tujuan: mengevaluasi akurasi dan kesesuaian pengukuran antara sensor suhu internal inkubator dan sensor referensi eksternal. Metode: Bland–Altman serta metrik kesalahan kuantitatif. Studi observasional cross-sectional dilakukan pada enam titik suhu (34°C, 35°C, 36°C, 37°C, 38°C, dan 39°C) dalam kondisi steady-state, menghasilkan 360 pasangan data dengan interval pencuplikan 2 menit. Akurasi dianalisis menggunakan Mean Absolute Error (MAE) dan Root Mean Square Error (RMSE), sedangkan kesepakatan dinilai melalui bias rata-rata dan Limits of Agreement (LoA) 95%. Hasil: menunjukkan sensor internal memiliki MAE 0,0646°C dan RMSE 0,0801°C, lebih rendah dibanding sensor referensi (MAE 0,0917°C; RMSE 0,1173°C). Bias rata-rata sebesar −0,012°C dengan LoA 95% antara −0,21°C hingga +0,19°C, dan 96% data berada dalam batas kesepakatan. Seluruh deviasi berada di bawah ambang ±0,5°C sesuai standar IEC 60601-2-19. Kesimpulan: sensor internal dinyatakan akurat, memiliki kesesuaian kuat, dan layak digunakan untuk pemantauan suhu neonatal intensif.
PENGEMBANGAN FARMASIPRENEUR TABLET TAMBAH DARAH BERBAHAN DASAR FERRO SULFAT DARI SCRAP BESI BENGKEL BUBUT UNTUK SISWA SMK Soebiyanto; Nur Hidayati; Lucia Sincu Gunawan; Muhammad Dzakwan; Ilham Kuncahyo; Ana Indriyati; Nicolay Wening Audrey; Sunardi; Argoto Mahayana; Bimo Putranto; Sumardiyono; Mahardira Dewantara; Afif Afghohani
BUDIMAS : JURNAL PENGABDIAN MASYARAKAT Vol. 7 No. 3 (2025): BUDIMAS : Jurnal Pengabdian Masyarakat
Publisher : LPPM ITB AAS Indonesia Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/budimas.v7i3.18190

Abstract

The partner in this Community Service Program is the Mandala Bhakti Health Vocational School, Pharmacy Department, located at Jalan Singosari Utara II, Nusukan Village, Banjarsari District, Surakarta City. Iron deficiency is a common nutritional problem, especially among adolescents. Scrap iron waste from machine shops has the potential to be used as a source of ferrous sulfate for the manufacture of iron supplements. This activity aims to develop iron supplement tablets from ferrous sulfate synthesized from iron scrap, ensure their safety through heavy metal testing, and enhance pharmaceutical entrepreneurship knowledge (pharmaceutical entrepreneurship) among vocational high school students. A total of 20 vocational high school students were involved in training that covered ferrous sulfate synthesis, tablet formulation, and product marketing strategies. Evaluation was conducted through pre-tests and post-tests, as well as heavy metal contamination analysis (Pb, Cu, Cd). The results showed a significant increase in knowledge, with an average pre-test score of 70 and a post-test score of 100. Heavy metal analysis showed no contamination (Pb: 0 ppm, Cu: 0 ppm, Cd: 0 ppm), making the tablets safe for use. This activity proved effective in enhancing students' knowledge and skills, and demonstrated that industrial waste can be utilized to produce valuable pharmaceutical products. The program supports the development of research-based and environmentally friendly pharmaceutical entrepreneurship among the younger generation.
Environmentally Friendly Synthesis of Ferric Chloride Coagulant from Scrap Iron for the Reduction of ion ferro and Total Dissolved Solids Sumardiyono; Sunardi; Argoto Mahayana; Nur Hidayati; Soebiyanto; Mahardira Dewantoro; Afif Afghohani
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The decline in groundwater quality, particularly in terms of TDS and Fe²⁺ levels, is a major concern in clean water supply. This study aims to synthesize and evaluate the effectiveness of FeCl₃ coagulant synthesized from scrap iron waste from a lathe workshop in reducing Total Dissolved Solids (TDS) and Fe²⁺ levels in borehole water. FeCl₃ was synthesized by reacting scrap iron waste with a 32% HCl solution. Water samples were tested for TDS and Fe²⁺ levels before and after treatment using gravimetric and UV-Vis spectrophotometric methods. The FeCl₃ coagulant doses used were 0.1%, 0.2%, and 0.3%. The results showed that the 0.3% dose provided the highest effectiveness in reducing Fe²⁺ levels by 80.10%, while the reduction in TDS reached 36.05% at the same dose. All doses successfully reduced Fe²⁺ levels to below the threshold set by Ministry of Health Regulation No. 2 of 2023 (<0.2 mg/l). This study demonstrates that FeCl₃ coagulant derived from iron waste is effective and has the potential to serve as an economical and environmentally friendly alternative for water treatment.
Co-Authors , Soebiyanto , Sumardiyono , Sunardi Afif Afghohani Afif Afghohani Afif Afghohani, Afif Ana Indriyati Anindyahadi, Fitri Bimo Putranto Efa Yumna Purwono Fakhrizal Falah Fitri Anindyahadi Gunawan, Lucia Sincu Ilham Kuncahyo Khamdan Annas Fakhryza Lucia Sincu Gunawan Mahayana, Argoto Muhammad Dzakwan Nicolay Wening Audrey Nisrina, Safira Fegi Nur Hidayati Nur Hidayati Nur Hidayati Setyo Adi Nugroho Setyo Adi Nugroho Soebiyanto Soebiyanto Soebiyanto, Soebiyanto Sumardiyono Sumardiyono Sumardiyono Sunardi Sunardi Sunardi Sunardi Sunardi Sunardi Suyamto, Yuli Yuli Siyamto, Yuli