Untung Sudadi

Department of Soil Science and Land Resource, IPB University, Bogor, Indonesia

Syaiful Anwar

Department of Soil Science and Land Resource, IPB University, Bogor, Indonesia

Rendy Anggriawan

Department of Agrotechnology, Muhammadiyah University of Jember, Jember, Indonesia

Didik Utomo Pribadi

Alumni of Land Resource Management Study Program, IPB University, Bogor, Indonesia

DOI: https://doi.org/10.19184/j-agt.v13i02.15327

ABSTRACT 

Land application of liquid waste containing palm oil mill effluent (LW-POME) as soil ameliorant can cause water contamination due to its high content of nitrate if improperly treated. Indonesia is rich with volcanic tuff materials that contain variable charged soil clay minerals. This study was aimed at to extract nanoclays (fraction sized <200 nm) from volcanic tuffs of Mt. Salak, West Java, Indonesia, and evaluate their potential use as adsorbent of nitrate in LW-POME. By applying dispersion, ultrasonication, centrifugation, and dialysis separation techniques, it could be extracted positively charged nanoclays nc3 and nc4 from the respectively tuff materials tv3 and tv4. Their potential use as natural adsorbent of nitrate as anionic contaminant was evaluated using Langmuir isothermal adsorption model. After 48 h equilibration, it could be extracted 4.33 mg nc3/g tv3 and 7.73 mg nc4/g tv4 with nitrate adsorption maxima of 48.3 and 40 mg/g for nc3 and nc4, respectively. The removal of nitrate in the LW-POME from 62 to 20 mg/L as to comply with the Indonesian liquid waste quality standard required 29.81 mg nc3/L or 39.34 mg nc4/L. The extracted nanoclays were considered prospective to be utilized as natural adsorbent for nitrate removal in LW-POME.      

Keywords: anionic contaminant, natural adsorbent, nitrate adsorption, volcanic tuff  

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