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All Journal Phi : Jurnal Pendidikan Fisika dan Terapan Pendas : Jurnah Ilmiah Pendidikan Dasar
Panggabean, Dwi Utami
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Earth & Planetary Sciences Education Engineering Physics Other

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Pengaruh Waktu Kontak Terhadap Penurunan BOD, COD, Dan Fe Pada Air Sungai Batang Toru Menggunakan Metode Elektrokoagulasi Masthura, Masthura; Husnah, Miftahul; Panggabean, Dwi Utami
Phi: Jurnal Pendidikan Fisika dan Terapan Vol 8, No 2 (2022)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v8i2.15956

Abstract

Sungai Batang Toru merupakan sungai yang menunjang kehidupan sebagian besar masyarakat Batang Toru. Akan tetapi, dampak dari olahan air limbah pertambangan emas Batang Toru mengakibatkan kualitas dan kuantitas air sungai Batang Toru mengalami penurunan. Penelitian ini tentang bagaimana pengaruh waktu kontak terhadap penurunan kadar BOD, COD, dan Fe menggunakan metode elektrokoagulasi. Adapun variasi waktu yang diberikan, yaitu 15 menit, 30 menit, dan 45 menit. Waktu kontak 15 menit merupakan waktu terbaik dalam penurunan kadar BOD dan COD. Nilai penurunan BOD mencapai 20 mg/L dengan efisiensi 66,67%  dan nilai penurunan COD mencapai 28,8% mg/L dengan efisiensi 54,54%. Untuk Fe waktu kontak 45 menit merupakan waktu terbaik dalam penurunan kadar, dengan nilai penurunan Fe mencapai 1,42 mg/L dengan efisiensi 99,39%.
Analisis Kemampuan Operasi Hitung Penjumlahan dan Pengurangan pada Siswa Kelas II SD di Batangtoru : Faktor Kesulitan dan Upaya Guru Panggabean, Dwi Utami; Caniago, Juliana Sari; Pefriani; Amir, Almira
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 Nomor 02, Juni 2026 Published
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.47666

Abstract

This study aims to analyze the addition and subtraction arithmetic skills of second-grade elementary school students, identify the factors causing learning difficulties, and describe teachers’ efforts to improve students’ numeracy skills. This study employed a qualitative approach with a descriptive method. Data were obtained through documentation study and analysis of relevant learning sources, including lesson documents, student evaluation results, and academic references. Data were analyzed through three stages: data reduction, data presentation, and conclusion drawing. The results showed that 71.4% of students (20 out of 28) were able to complete simple addition without the carrying technique, with an average score of 82.5. However, only 46.4% were able to correctly perform column addition with carrying, and only 39.3% could complete column subtraction with borrowing, indicating a significant gap between simple and column operations. The main difficulties stemmed from three interconnected factors: weak understanding of place value concepts, low learning motivation exacerbated by conventional teaching methods, and insufficient parental support at home. Teachers’ efforts included the use of concrete manipulative media, structured remedial programs that resulted in an average score improvement of 12 points, and interactive game-based learning activities. These findings suggest that innovative, student-centered, and sustainable learning strategies are essential to optimize elementary students’ arithmetic competence.
Co-Authors Almira Amir Caniago, Juliana Sari Masthura, Masthura Miftahul Husnah Pefriani