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p-Index From 2021 - 2026
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This Author published in this journals
All Journal Journal of Educational, Health and Community Psychology International Journal of Hydrological and Environmental for Sustainability
Wisnu Prayogo
Department of Civil Engineering, Universitas Negeri Medan
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Environmental Science Public Health

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Covid-19 Prevention Protocol Implementation in Construction Projects Rachmat Mulyana; Meuthia Fadila Fachruddin; Erni Rukmana; Wisnu Prayogo
Journal of Educational, Health and Community Psychology Vol 10 No 4 December 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/jehcp.v10i4.22348

Abstract

Abstract Construction work projects that are currently underway during the pandemic must implement a protocol to prevent the spread of COVID-19. The purpose of this study was to analyze the implementation of the prevention protocol in several construction work projects in North Sumatera. The data research was collected from the Indrapura–Kisaran highway, the Kuala Tanjung–Tebing Tinggi–Parapat highway, and the RIS Maduma–Dairi University Flats using questionnaire and interviews method. This study result is the contractor provides health measures in an effort to prevent the spread of COVID-19 as follows hand washing area (100%), body temperature check (100%), COVID-19 handling post (66.7%), supplementation (33.3%), provision of hand sanitizer (100%), and medical personnel (66.7%). The nutritional content needs of the workers are met to maintain their immunity (66.7%). The contractors, consultants, and project owners of the three construction projects have implemented the prevention protocol in accordance with the minister’s instructions. Keywords: construction, consumption, COVID-19 pandemic, projects, workers. 
Removal of COD, BOD, and Detergent from Laundry Wastewater Using Coconut-Shell Activated Carbon in Batch and Continuous Fixed-Bed Adsorption Alexander Tunggul Sutan Haji; Mujaroh Khotimah; Putri Setiani; Amelia Gultom; Ichi Fiaqi Hamada; Abentin Estim; Wisnu Prayogo
International Journal of Hydrological and Environmental for Sustainability Vol. 5 No. 2 (2026): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v5i2.1246

Abstract

Laundry wastewater contains high organic matter and detergent residues that may degrade the receiving water quality if discharged without treatment. This study investigated the performance of coconut-shell activated carbon for reducing chemical oxygen demand (COD), biochemical oxygen demand (BOD), and detergent concentration in laundry wastewater, using batch and continuous fixed-bed adsorption systems. Four activation treatments were evaluated at the batch stage: no activation, NaOH 0.2 N, HCl 0.1 N, and sequential NaOH 0.2 N–HCl 0.1 N. The best activator was then applied in a continuous upflow column with adsorbent thicknesses of 15, 20, and 25 cm. HCl 0.1 N produced the highest batch removal efficiencies, reaching 73.30% for COD, 71.53% for BOD, and 75.73% for detergent. Adsorption equilibrium for all parameters was better described by the Freundlich model than by the Langmuir model, indicating adsorption on a heterogeneous carbon surface. In the continuous system, the 25 cm bed showed the highest concentration-based removal, reaching 97.12% for COD, 97.03% for BOD, and 99.66% for detergent, and provided the longest breakthrough delay. However, the 20 cm bed yielded the highest average pollutant-load reduction, indicating a more balanced operational performance. Hydraulic conductivity decreased from 0.000058 to 0.000036 m/s during operation, suggesting progressive pore blockage and adsorbent saturation. These results demonstrate that coconut-shell activated carbon has good potential as a simple and practical adsorbent for decentralized laundry wastewater treatment.
Co-Authors Abentin Estim Alexander Tunggul Sutan Haji Amelia Gultom Erni Rukmana Ichi Fiaqi Hamada Meuthia Fadila Fachruddin Mujaroh Khotimah Putri Setiani Rachmat Mulyana