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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Manajemen Teknologi Jurnal Teknik ITS IPTEK Journal of Proceedings Series Jurnal Manajemen Aset Infrastruktur dan Fasilitas Jurnal Purifikasi Prosiding Seminar Nasional Sains dan Teknologi Terapan Envirotek : Jurnal Ilmiah Teknik Lingkungan Journal of Civil Engineering, Planning, and Design (JCEPD)

MOHAMMAD RAZIF* and AHMAD ADIB

Jurusan Teknik Lingkungan Institut Teknologi Adhi Tama Surabaya

Author-ID : 321428

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science Mathematics Social Sciences Transportation

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POTENSI PEMANFAATAN SLAG ALUMINIUM SEBAGAI SUBSTITUSI SEMEN DALAM PROSES STABILISASI/SOLIDIFIKASI LIMBAH B3 DENGAN KAJIAN PUSTAKA (STUDI KASUS : PT.X KECAMATAN KESAMBEN, JOMBANG) Komang Ardya Putri Saraswati; Mohammad Razif
Envirotek : Jurnal Ilmiah Teknik Lingkungan Vol 12 No 2 (2020): Envirotek : Jurnal Ilmiah Teknik Lingkungan
Publisher : Program Studi Teknik Lingkungan, Universitas Pembangunan Nasional Veteran Jawa Timur

According to PP 101 Year 2014, aluminum slag is classified as BTS waste in code B313-2 and thus, will bring chronicle effects. This research aimed at investigating the potentials of aluminum slag by analyzing the waste characteristics, solidification process, compressive strength, and TCLP of BTS waste solidification product. The results of research demonstrated that the slag contained BTS elements and based on PP 101 Year 2014, they must be managed, one of which is through stabilization/solidification. The process of using aluminium slag waste solidification in this research was conducted by crushing, grinding, sorting from aluminium dross and recovering metal via smelting. Slag has potentials for construction materials such as geopolymer concrete, concrete brick, pressed brick, and paving block. The best composition for using aluminium slag with solidification is less than 20% because the product will get leaching. The highest compressive strength of slag by 36.8 Mpa at X Ltd in Jombang was for paving block of parking area. In addition, TCLP test toward aluminium slag has fulfilled USEPA standard and it is safe for the environment in the long period. Keywords: aluminium slag aluminium, solidification, compressive strength, TCLP

PREDIKSI STATUS MUTU AIR KALI SURABAYA DENGAN METODE SYSTEM DINAMIC DI STASIUN MONITORING BENDUNGAN GUNUNG SARI SURABAYA Rachmad Hermawan; Mohammad Razif
Envirotek : Jurnal Ilmiah Teknik Lingkungan Vol 13 No 1 (2021): Envirotek : Jurnal Ilmiah Teknik Lingkungan
Publisher : Program Studi Teknik Lingkungan, Universitas Pembangunan Nasional Veteran Jawa Timur

Humans need water for survive, one of which is for drinking. Before used for drinking purposes, it is require treatment first. In Surabaya, there is a Drinking Water Processing Installation that serves drinking water for the people of the city of Surabaya. This research aimed at predicting the quality status and water quality of Surabaya River by employing dynamic system and pollution index. The research used the water quality of the Surabaya river (Gunung Sari monitoring station) in 2014-2016, and prediction of water quality using the dynamic system method (stella) for 2017-2021. Based on the prediction results, it is known that the predicted values of BOD, TSS, DO, PO4 and COD do not exceed the standard except for NO3. Based on the Pollution Index, the water quality of Surabaya River from 2017-2021: TSS is in the heavily polluted category; BOD, DO, and PO4 in the lightly polluted category; COD and NO3 in the safe category.

Consumer Insight During Covid-19: Understanding the Influence of Price Saving Benefits, Time Saving Benefits, and Food Safety Risk Perception To Consumer Intention On Online Food Delivery Nadlifatin, Reny; Rahmanqa, Alifio; Razif, Mohammad; Persada, Satria Fadil
Jurnal Manajemen Teknologi Vol. 22 No. 3 (2023)
Publisher : Unit Research and Knowledge, School of Business and Management, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12695/jmt.2023.22.3.1

Abstract. Technology has a significant impact on human existence, particularly in the phenomenon of online food delivery services. Every year, this makes online food shopping more appealing to the public. The study's goal is to compare consumers' willingness to use online meal delivery services during the Covid-19 pandemic to the new normal. The research methodology employed in the study was multivariate Structural Equation Modeling (SEM). Price savings benefits, time savings benefits, and food safety risk perceptions are all considered crucial and relevant in influencing customer intentions. The relevant data was acquired from online meal delivery customers by 299 data during the survey stage. A Google form was used to conduct the survey online. The Partial Least Square SEM approach will be utilized for the data analysis calculation stage. The findings of this investigation reveal three established hypothetical links. Data analysis revealed that Food Safety Risk Perception has a negative and significant impact on customer intentions. Customers' intentions are positively influenced by the Price Saving Benefit and the Time Saving Benefit is revealed to be the highest beta value. This study also discusses theoretical and practical contributions. Keywords: Online food delivery, price saving benefits, time saving benefits, food safety risk perceptions, consumer intention Abstrak. Teknologi memiliki dampak yang signifikan terhadap keberadaan manusia, khususnya dalam fenomena layanan pengiriman makanan. Setiap tahun, ini membuat belanja makanan online lebih menarik bagi masyarakat umum. Tujuan studi tersebut adalah membandingkan keinginan konsumen untuk menggunakan layanan pesan antar makanan online di masa pandemi Covid-19 dengan kenormalan baru. Metodologi penelitian yang digunakan dalam penelitian ini adalah multivariat Structural Equation Modeling (SEM). Manfaat penghematan harga, manfaat penghematan waktu, dan persepsi risiko keamanan pangan semuanya dianggap penting dan cukup relevan dalam memengaruhi niat pelanggan. Data yang relevan diperoleh dari pelanggan pengiriman makanan online dengan jumlah 299 data selama tahap survei. Formulir Google digunakan untuk melakukan survei online. Pendekatan SEM Partial Least Square akan digunakan untuk tahap perhitungan analisis data. Temuan penyelidikan ini mengungkapkan tiga hubungan hipotetis yang mapan. Analisis data mengungkapkan bahwa Persepsi Risiko Keamanan Pangan memiliki dampak negatif dan signifikan terhadap niat pelanggan. Niat pelanggan dipengaruhi secara positif oleh Price Saving Benefit dan Time Saving Benefit ditemukan sebagai nilai beta tertinggi. Studi ini juga membahas kontribusi teoritis dan praktis. Kata kunci: Pengiriman makanan online, manfaat penghematan harga, manfaat penghematan waktu, persepsi risiko keamanan pangan, niat konsumen

Operational Cost Efficiency and Profitability Effects on Companies Distribution Stock Prices During Covid-19 Putra, Raden Aditya Kristamtomo; Fadil Persada, Satria; Devi Kumalasari, Riesta; Mira Herdina, Ajeng; Sekardhani, Mufida; Razif, Mohammad
Jurnal Manajemen Teknologi Vol. 23 No. 1 (2024)
Publisher : Unit Research and Knowledge, School of Business and Management, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12695/jmt.2024.23.1.5

Abstract. This study was conducted to determine whether the efficiency of operating costs and profitability of companies listed on the Indonesia Stock Exchange in the banking sector on stock prices. Research design, data, and methodology: This study uses 35 banking companies from 2020 to 2021 as a sample in the study, with a total of 70 financial statements data. The analysis test was conducted to see the effect of operational cost efficiency and profitability on stock prices in banking companies during the covid-19 pandemic. Multiple linier regression is conducted to check the simultaneous test and partial test. As for the indicators in cost efficiencies are operating expenses on operating income. The profitability effects indicators are based on return on equity. Stock prices indicators are based on internal and external policies and abilities. The test results show that operational cost efficiency and profitability have a simultaneous effect on stock prices. However, it partially shows that operational cost efficiency has no significant effect. Meanwhile, profitability shows positive results and has a significant effect. Conclusions: Based on the table of the Coefficient of Determination (R²) test, the value of Adjusted R Square is 98.7%. This shows that the variables of Operational Cost Efficiency and Profitability affect the stock price by 98.7% and the remaining 1.3% is influenced by other variables. Practical perspectives are further discussed in the paper. Keywords: Operation cost efficiency, profitability effects, stock prices, multiple linier regression, banking sector Abstrak. Penelitian ini dilakukan untuk mengetahui apakah efisiensi biaya operasional dan profitabilitas perusahaan yang terdaftar di Bursa Efek Indonesia di sektor perbankan terhadap harga saham. Desain penelitian, data, dan metodologi: Penelitian ini menggunakan 35 perusahaan perbankan dari tahun 2020 hingga 2021 sebagai sampel dalam penelitian, dengan total 70 data laporan keuangan. Uji analisis dilakukan untuk melihat pengaruh efisiensi biaya operasional dan profitabilitas terhadap harga saham di perusahaan perbankan selama pandemi covid-19. Regresi linier berganda dilakukan untuk memeriksa uji simultan dan uji parsial. Adapun indikator dalam efisiensi biaya adalah biaya operasional pada pendapatan operasional. Indikator efek profitabilitas didasarkan pada pengembalian ekuitas. Indikator harga saham didasarkan pada kebijakan dan kemampuan internal dan eksternal. Hasil pengujian menunjukkan bahwa efisiensi biaya operasional dan profitabilitas berpengaruh simultan terhadap harga saham. Namun, sebagian menunjukkan bahwa efisiensi biaya operasional tidak berpengaruh signifikan. Sementara itu, profitabilitas menunjukkan hasil positif dan berpengaruh signifikan. Kesimpulan: Berdasarkan tabel uji Coefficient of Determination (R²), nilai Adjusted R Square adalah 98,7%. Hal ini menunjukkan bahwa variabel Efisiensi Biaya Operasional dan Profitabilitas mempengaruhi harga saham sebesar 98,7% dan sisanya 1,3% dipengaruhi oleh variabel lainnya. Perspektif praktis dibahas lebih lanjut dalam penelitian ini. Kata kunci: Efisiensi biaya operasi, efek profitabilitas, harga saham, regresi linier berganda, sektor perbankan

BOD, COD, and TSS Predictions from DO measurement results for the Surabaya River, Indonesia Razif, Mohammad
Journal of Civil Engineering, Planning and Design Vol 1, No 1 (2022): May
Publisher : Faculty of Civil Engeneering and Planning - ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jcepd.2022.v1i1.3047

The fluctuation of water quality of Surabaya river requires anticipation of online monitoring of major pollution parameters of BOD, COD, TSS for input in the drinking water treatment process. The sustainability of long-term river water quality is also very important for the sustainability of the operation of Water Treatment Installation. The purpose of this study is modelling water quality parameters to find empirical equations to calculate the value of BOD, COD, TSS from DO values with regression method and test the sustainability of Surabaya river water quality parameters using a control chart. This study developed an empirical relationship to estimate BOD, COD, TSS based on DO which has been validated statistically. The results showed that BOD, COD and TSS decreased with increasing DO and among them COD parameters decreased at a higher level compared to BOD or TSS for each increase in DO. Research data with control charts and boxplot methods also show similarities in Surabaya river water quality data characteristics for BOD, COD, TSS and DO between 2014 and 2015 which can still be tested again for the next few years to ensure the sustainability of raw water quality for drinking water treatment plants in the city of Surabaya and has great potential to be tested on rivers where raw water is used for drinking water sources in many cities in Indonesia.

Optimization of District Metered Areas for Reducing Non-Revenue Water Swantara, Dewa Made Indra Widnyana; Razif, Mohammad; Pramitasari, Yantri Novia
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Article in Press 2025 (For Upcoming Issue)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v0i0.%p

Non-revenue water (NRW) is a significant issue for water supply in Indonesia, with a national NRW rate of 33.7% in 2022 and even higher at PT Air Minum Giri Menang (PT AMGM) at 36.21%. Although District Metered Areas (DMA) were implemented in 2018, their effectiveness has been limited due to poor monitoring. This study evaluates the current DMA conditions by creating a water balance and using EPANET 2.2 software for analysis, along with formulating optimization strategies through technical, financial, and institutional assessments. The research identifies fifteen DMAs, with five being well-established. Two DMAs were chosen for optimization. Simulations showed that many pipes in these DMAs did not meet flow speed standards. Water pressure in DMA Graha Permata Kota was fully satisfied at 100%, while DMA Elit Kota Mataram achieved 84.5%. The study noted a significant NRW reduction by an average of 27.26% in the selected DMAs. The total repair cost was Rp 14,725,300, leading to additional annual revenue of Rp 128,747,424 and a positive feasibility analysis. Institutional performance was rated as "good," but an increase of 14 field staff for water loss control is needed.

Co-Authors ABDUL HAMID Devi Kumalasari, Riesta Fadil Persada, Satria H Poernomo, Moerdiyanto Hermawan, Rachmad Ida Dwi Maharani Komang Ardya Putri Saraswati Mahirul Mursid Mansur, Anang Mas Agus Mardyanto Mira Herdina, Ajeng Muzakky, Achmad Nieke Karnaningroem Persada, Satria Fadil Pramitasari, Yantri Novia Putra, R. Aditya Kristamtomo Rachmat Ridho Permata Putra Siregar Rahmanqa, Alifio Reny Nadlifatin Sekardhani, Mufida Swantara, Dewa Made Indra Widnyana

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