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All Journal Jurnal Rekayasa Lingkungan Cerdika: Jurnal Ilmiah Indonesia
Rita Dewi Triastianti
Institut Teknologi Yogyakarta
Humanities Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Public Health Social Sciences

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IDENTIFIKASI POTENSI LIKUIFAKSI BERDASARKAN ANALISIS DATA MIKROTREMOR DI DESA TRIMURTI, SRANDAKAN, BANTUL Heru Bagus Hermawan; Dimas Taufiq Ridlo; Nasirudin; Rita Dewi Triastianti
Jurnal Rekayasa Lingkungan Vol. 22 No. 2 (2022)
Publisher : Institut Teknologi Yogyakarta

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Abstract

Telah dilakukan penelitian untuk mengidentifikasi potensi terjadinya likuifaksi berdasarkan analisis data mikrotremor di Desa Srandakan, Trimurti, Bantul yang terletak di pesisir pantai Selatan Yogyakarta dan di bantaran sungai Progo. Metode analisis yang digunakan adalah metode Horizontal to Vertical Spectral Ratio (HVSR) yang akan memberikan informasi mengenai nilai Frekuensi Dominan (f0), Amplifikasi (A0), Indeks Kerentanan Seismik (Kg), dan Ketebalan Lapisan Sedimen (h) di daerah penelitian. Berdasarkan hasil analisis data diperoleh nilai Frekuensi Dominan (f0) antara 1,60 – 9,94 Hz, Amplifikasi (A0) antara 2,35 – 4,43, Indeks Kerentanan Seismik (Kg) antara 4,01 x 10-6 – 4,45 x 10-5 s2/cm, dan Ketebalan Lapisan Sedimen (h) antara 6,54 – 46,25 m. Potensi likuifaksi ditentukan berdasarkan sebaran nilai-nilai tersebut, sehingga dapat disimpulkan bahwa di beberapa lokasi di Desa Trimurti memiliki potensi terjadinya likuifaksi yaitu di sekitar titik S04 dan S12. Selain itu menurut pengamatan di lapangan, lapisan tanah permukaan Desa Trimurti didominasi oleh tanah berpasir.
Utilization of Domestic Sewon Bantul Sewage Sludge as Raw Material for Granular Organic Fertilizer (GOF) Ryan Bazaliel Alexandro Timpua; Warsiyah Warsiyah; Endah Ayuningtyas; Rita Dewi Triastianti
Cerdika: Jurnal Ilmiah Indonesia Vol. 6 No. 6 (2026): Cerdika: Jurnal Ilmiah Indonesia
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/cerdika.v6i6.3566

Abstract

Domestic wastewater treatment plant (WWTP) sludge still contains organic matter and nutrients, indicating its potential for beneficial reuse. This study aimed to analyse the physicochemical characteristics of dried sludge from Sewon WWTP, Bantul Regency, and to evaluate its potential as a raw material for granular organic fertilizer through physical stabilisation without active composting. Dried sludge obtained from the sludge drying bed was formulated into four treatments: 100% sludge (F1), sludge combined with cattle manure (F2), sludge combined with fermented organic fertilizer mijongan (F3), and sludge combined with rice husk (F4), each at a 1:1 ratio. The processing stages included crushing, mixing, manual granulation using starch as a binder, and laboratory analysis of pH, moisture content, organic carbon, total nitrogen, total phosphorus, total potassium, and C/N ratio, with results compared against national solid organic fertilizer standards. The results showed that all formulations met the requirements for pH and organic carbon content. Variations were observed in moisture content, total nitrogen, and C/N ratio. Total phosphorus and potassium did not meet the minimum standard of ?2% across any of the formulations. The F4 formulation (sludge combined with rice husk) demonstrated the most balanced physicochemical quality, with a moisture content of 7.77%, total nitrogen of 2.15%, and a C/N ratio of 16.96. Overall, Sewon WWTP sludge shows potential as a raw material for granular organic fertilizer; however, further formulation optimisation is required to meet the minimum standards for phosphorus and potassium content.
Co-Authors Ayuningtyas, Endah Dimas Taufiq Ridlo Heru Bagus Hermawan Nasirudin Ryan Bazaliel Alexandro Timpua Warsiyah Warsiyah