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All Journal Jurnal Inovasi Teknik Kimia
Abdul Hadi
Agroekoteknologi, Fakultas Pertanian Universitas Malikussaleh, Reuleut, Aceh Utara 24351
Chemical Engineering, Chemistry & Bioengineering

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Sintesis Dan Karakterisasi Struvite Dari Limbah Ikan Dengan Pelapis Kitosan Sebagai Pupuk Lepas Lambat Raudhatul Ulfa; Kezia Agustina Br Panjaitan; Tinasyah Fitri; Muhammad Erik Syahputra; Abdul Hadi; Firda Tirta Yani
Jurnal Inovasi Teknik Kimia Vol. 11 No. 3 (2026): JULY | INTEKA - Jurnal Inovasi Teknik Kimia
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v11i3.15645

Abstract

Fish waste is organic biomass that may cause environmental pollution; however, its nitrogen and phosphorus contents can serve as nutrient sources for struvite synthesis. This study aimed to synthesize and characterize struvite derived from fermented fish waste and coated with chitosan for use as a slow-release fertilizer. Fish waste was anaerobically fermented using EM4 and molasses. The resulting filtrate was reacted with Mg²⁺:NH₄⁺:PO₄³⁻ molar ratios of 1:1:1, 1:1:2, and 1.2:1:1 under pH conditions ranging from 8 to 10. The resulting struvite was coated with chitosan extracted from shrimp-shell waste and characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Fertilizer effectiveness was evaluated on pak choi plants based on plant height, leaf number, and leaf width. The optimum condition was achieved at pH 9 and a molar ratio of 1.2:1:1, yielding 83.03% phosphate-removal efficiency and 2.40 g of product. FTIR spectra confirmed the presence of P–O and Mg–O bonds and interactions between chitosan functional groups and struvite. SEM revealed orthorhombic prismatic struvite crystals with an amorphous coating. Plant tests indicated that chitosan-coated struvite gradually released nutrients and supported stable pak choi growth. These findings demonstrate its potential as an environmentally sustainable slow-release fertilizer.
Co-Authors Firda Tirta Yani Kezia Agustina Br Panjaitan Muhammad Erik Syahputra Raudhatul Ulfa Tinasyah Fitri