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All Journal Jurnal Solum Tropical Wetland Journal Agroekotek View Journal of Civil Engineering and Planning (JCEP) Journal of Infrastructure and Civil Engineering Acta Solum
Ahmad Kurnain, Ahmad
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Engineering Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Transportation Other

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MOISTURE RELEASE OF TROPICAL PEAT SOILS AS DECREASING WATER TABLE Kurnain, Ahmad
TROPICAL WETLAND JOURNAL Vol 1, No 1 (2015)
Publisher : The Journal is published by Graduate Programe of Lambung Mangkurat University

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Abstract

Hydro-physics of peat soils varied with their peat decomposition degree. One of the important hydro-physics is ability of the peat soil to release water as decreasing water table. Potential of water availabilty to crop growth is evidently related to this behaviour. The present study was conducted to understand modes of moisture release of peat soils as decreasing water table. Water tables were simulated using a hanging column method.  The water table was arranged at levels of 0, 10, 20, 30, 50, and 100 cm below peat column surfaces. Potential of moisture release or in oppositely potential of moisture retention could be modelled with the 3 parameter equation.  Highly decomposed peat characterized by higher bulk density and lower total porosity stored less water but retained more water.Key words: available water, bulk density, peat soil, porosity.
Performance of Activated Carbon Adsorption and Ultrafiltration Membrane Hybrid Process for Leachate Treatment Farah Diena, Nurin Nisa; Mahmud, Mahmud; Riduan, Rony; Kurnain, Ahmad
TROPICAL WETLAND JOURNAL Vol 4, No 1 (2018)
Publisher : The Journal is published by Graduate Programe of Lambung Mangkurat University

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Abstract

Leachate is wastewater that contains pollutants dominated by organic matter. Conventional leachate treatments have some disadvantages therefore alternative treatments are needed. One of that alternative treatments is ultrafiltration membrane and adsorption as pretreatment. The aims of this study are to analyze adsorption isotherm and kinetic model for UV254 (UV adsorbance at 254 nm wavelength) adsorption, the performance of powdered activated carbon (PAC) adsorption and ultrafiltration membrane hybrid process for UV254 of leachate removal, and the effect of pretreatment towards membrane fouling. The result of this study are Freundlich isotherm and pseudo second order kinetic model best fitted model for ultrafiltration membrane hybrid process condition for UV254 removal level are at pH 6; 120 minutes contact time; and 4 g/L PAC doses. Adsorption as pretreatment can reduce membrane ultrafiltration fouling.
CAPILLARY ACTION OF WATER ON PEAT SOIL APPLIED SWRT MEMBRANES IN DIFFERENT LAND USES Nugraha, Muhammad Imam; Kurnain, Ahmad
Jurnal Solum Vol 20, No 2 (2023)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jsolum.20.2.%p.2023

Abstract

Plants, water, and peat soil interact to form peatland ecosystems, which are composed of these three interrelated elements. The water balance of peatlands is significantly influenced by the capillarity of the peat soil. This study attempts to ascertain the impact of depth on applying subsurface water retention technology (SWRT) membrane on capillary action based on moisture of peat soil in different    land uses. A completely nested randomized design was utilized in this investigation to avoid bias of the different degree of decomposition between land uses. The type of land use—namely, shrubs (PL1) and agricultural land (PL2) was the first account. The position of the membrane (its depth), which was set at -20 cm (D1), -30 cm (D2), and -50 cm (D3) and in addition to a control treatment without membrane installation (D0), was the second account. Three times each experimental unit was repeated. The YL-100 soil moisture content sensor, which is powered by Arduino, presented the research results. Arduino can produce digital values with a range of 0 to 1023 by converting moisture values that were  output as analog signals into digital values using an analog to digital converter (ADC) with a resolution of 10 bits. The outcome revealed that soil moisture content increasing up to the peat soil layer of 5 to 10 cm until the fifth day of observation due to rainfall along our study that increased the flux of water flow into the peat soil. 
Pengaruh Pemberian Pupuk Urea, Zeolit dan Asam Humat Terhadap Pertumbuhan Bawang Daun (Allium fistulosum L.) dan Perubahan Beberapa Sifat Kimia Tanah Pada Lahan Gambut Ramadhani, Riko Putra; Ifansyah, Hairil; Kurnain, Ahmad
Agroekotek View Vol 7, No 1 (2024)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/agtview.v7i1.4081

Abstract

Management and utilization of turf soil for cultivation faces several problems such as pH conditions that quite high acidic, and also the fertility in turf soil is quite low. The mixing of Urea Fertilizer with the addition of ameliorant materials such as Zeolite, and Humic Acid was expected to improve the N nutrient status in turf soils to achieve optimal conditions for plants growth to be cultivated on turf soils. The goals of this study was to determine the effect ofapplied Urea Fertilizer, Zeolite and AH-90 on changes in pH, N-Mineral (NH4+    and NO3-),soluble Fe, dry weight, N absorption of Onion plants (Allium fistusolum L.) that planted on turf soils. This study used a completely randomized design (CRD). The experimental factor that applied in this study was Urea Fertilizer within the level 0 kg/ha, 75kg/ha and 100 kg/ha. Zeolite within the level 0 tons/ha and 10 tons/ha. And Humic Acid (AH-90) within the level 0 kg/ha and 10 kg/ha. The result of this study showed that the interaction of treatment (Urea, Zeolite and Humic Acid) had no impact on parameter changes in the pH value of turf soils, N Plant Tissue,and dry weight of onion plants. The addition of Urea was able to increase the Nitrate (NO3-)content in the soil. And Zeolite application can reduce the Ammonium (NH4+) and iron solubilityin turf soil.
Analisis Perbandingan Parameter Model Mock dan Nreca Dalam Prediksi Aliran Rendah (Studi Kasus: DAS Siak Bagian Hulu) Husaini, Rizki Ramadhan; Ningrum, Puspa; Alputra, Giya Naufal; Kurnain, Ahmad
Journal of Infrastructure and Civil Engineering Vol. 4 No. 3 (2024)
Publisher : Program Studi Teknik Sipil Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/jice.v4i3.63

Abstract

Analisis aliran rendah (low flow) merupakan salah satu aspek penting dalam pengelolaan sumber daya air, terutama untuk menjaga keberlanjutan pasokan air pada musim kering dan mengelola dampak kekeringan. Beberapa model hidrologi untuk analisis aliran rendah dapat digunakan termasuk Metode Mock dan NRECA. Penelitian ini bertujuan untuk membandingkan dua metode tersebut dalam analisis debit lapangan guna mendapatkan hasil yang terbaik. Uji model Mock dan NRECA dilakukan menggunakan tiga parameter utama dan dievaluasi berdasarkan berbagai kriteria penilaian kinerja model. Pada DAS Siak Bagian Hulu, hasil uji dengan menggunakan Metode Mock menunjukkan koefisien korelasi (R) sebesar 0,405, volume error (VE) sebesar 3,735 %, dan koefisien efisiensi (CE) sebesar -1,106. Sementara itu, hasil untuk Metode NRECA memberikan koefisien korelasi (R) sebesar 0,456, volume error (VE) sebesar 4,866 %, dan koefisien efisiensi (CE) sebesar -2,462. Secara keseluruhan, hasil analisis debit lapangan terbaik di DAS Siak Bagian Hulu ditunjukkan oleh metode Mock dibandingkan dengan NRECA
Pekanbaru Town Square Development With Concept Mix Use Building (Shopping Mall, Hotel, Condotel, Convention, Sport Centre) Kurnain, Ahmad; Bambang Supeno; Muhammad Yazid; Rahmat Tisnawan; Rizki Ramadhan Husaini
Journal of Civil Engineering and Planning (JCEP) Vol. 6 No. 1 (2025)
Publisher : Program Studi Sarjana Teknik Sipil Universitas Internasional Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/jcep.v6i1.10106

Abstract

This study assesses the financial feasibility of a privately financed infrastructure project under a Build-Operate-Transfer (BOT) scheme with a total investment of USD 76 million. The investment is distributed over a three-year construction phase, followed by a 30- to 60-year operation period generating annual net profits of USD 8.64 million. Key financial metrics including Net Present Value (NPV) and Internal Rate of Return (IRR) are utilized to evaluate the project. The results indicate a negative NPV of approximately USD -14.85 million for a 30-year operation, suggesting the project is not viable under a conservative time horizon. However, extending the operation to 60 years yields a positive NPV of USD +23.8 million and an estimated IRR of 11.7%, surpassing the assumed discount rate of 10%. These findings highlight the importance of operational duration in BOT projects and suggest that long-term operation is essential to achieve financial sustainability. Recommendations include extending the concession period and optimizing cost structures to enhance investment attractiveness.
Kemasaman Tanah, C-Mikroorganisme dan Pertumbuhan Bawang Daun di Lahan Gambut Berdasarkan Perbedaan Jarak Dari Saluran Air Maulidi, Muhammad Daud; Kurnain, Ahmad; Hadi, Abdul
Acta Solum Vol 3 No 2 (2025): Maret 2025
Publisher : Department of Soil, Faculty of Agriculture, Lambung Mangkurat University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/actasolum.v3i2.2636

Abstract

This research aims to determine differences in soil acidity, C-microorganisms and the growth of spring onion (Allium fistulosum L.) on peatlands based on the difference in distance from waterways. The study will be conducted from February 2022 to May 2022. The implementation of the research is located in the Greenhouse and in the Laboratory of Physical Chemistry and Biology, Department of Soil Science, Faculty of Agriculture, Lambung Mangkurat University, Banjarbaru. This research method is quantitative research with a survey approach using exploratory descriptive methods. The data analysis used was by paired T-Test analysis to find out the differences in parameters observed over a period of five days. The result of this study was that there was a difference in soil acidity and growth of spring onion plants, while C-microorganisms was not.
Co-Authors Abdul Hadi Alputra, Giya Naufal BAMBANG SUPENO Farah Diena, Nurin Nisa Hairil Ifansyah Husaini, Rizki Ramadhan Mahmud Mahmud Maulidi, Muhammad Daud Muhammad Imam Nugraha Muhammad Yazid Puspa Ningrum Rahmat Tisnawan Ramadhani, Riko Putra Rizki Ramadhan Husaini Rony Riduan