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All Journal GEA, Jurnal Pendidikan Geografi PELS (Procedia of Engineering and Life Science)
Handoko, Muhammad
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Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering

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Spatial and Temporal Analysis of Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) Concentrations in Rawa Pening Lake, Semarang Regency Handoko, Muhammad; Sutrisno, Alfred Jansen
Jurnal Pendidikan Geografi Gea Vol 21, No 1 (2021)
Publisher : Indonesia University of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v21i1.32330

Abstract

Rawa Pening Lake are the waterbody which it waters comes from a swamp spring, besides that several rivers empty into Rawa Pening, including Galeh River, Torong River, Panjang River, Muncul River, Parat River, Legi River, Pitung River, Praginan River, and Rengas River. Three problems cause damage to the Rawa Pening Lake ecosystem, namely damage to the water catchment area, damage to the lake border, and water pollution. This study aims to analyze Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) spatially and temporally due to damage to the lake ecosystem. The method used was Inverse Distance Weighted (IDW), where 12 sample point locations were taken, 10 sample points representing each village (lake inlet and utilization), and 2 sample points representing the center and outlet of the lake. The average DO yield in September 2020 was 6.8 mg / L, then in October 2020 it was 4.65 mg / L and in November 2020 it was 3.04 mg / L. Then the average BOD in September 2020 was 3.16 mg / L, then in October 2020 it was 2.6 mg / L and in November it was 1.53 mg / L, so it can be seen that the DO variable and BOD both decreased from September to November 2020.
Experimental Study of an Aquaponic System with Leeks and a Fish Pond: Effectiveness and Productivity: Studi Experimental Sistem Aquaponik dengan Daun Bawang dan Kolam Ikan: Efeksitas dan Produktivitas Handoko, Muhammad; Miftakhurrohmat, A.
Procedia of Engineering and Life Science Vol. 8 No. 2 (2025): Proceedings of the 8th Seminar Nasional Sains 2025
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/pels.v8i2.2905

Abstract

The growth of shallot plants using conventional soil methods is often constrained by the limited efficiency of water use and uneven nutrient availability. This study aims to analyze the effectiveness of an aquaponic system with various growing media (gravel, charcoal, cocopeat, and hydroton) compared to conventional soil cultivation. The experimental method was conducted by observing leaf length (cm) and the number of leaves over 15 days in each growing medium. The results showed that the aquaponic system significantly enhanced shallot growth compared to the soil method. Hydroton medium provided the best results, with leaf length reaching 28 cm and 7 leaves within 15 days, outperforming other media. Growth efficiency in hydroton reached 84.21% at the 5-day observation. The study concludes that the aquaponic system is more efficient in supporting shallot growth than the soil method, offering better water savings, more consistent nutrient availability, and supporting the concept of sustainable agriculture.  
Co-Authors Alfred Jansen Sutrisno Miftakhurrohmat, A.