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<p>Wastewater management nowadays targets simultaneously contaminant removal and further utilization while the operation needs to be affordable and comprehensible. This study investigates the adsorption of pristine human urine and the secondary effluent wastewater onto rice husk biochar and subsequently producing hydroponic nutrients using desorption for growing <i>Ocimum basilicum</i> L. (<i>O.basilicum </i>L.). SEM, BET, EDS, XRD, and FTIR were employed to characterize the adsorbent. The results demonstrated that rice husk biochar exhibited excellent adsorption performance, with total organic carbon adsorption efficiency ranging from 60 to 80%, depending on the type of wastewater. Also, 50% of total nitrogen, 70% of phosphorus, and about 80% of potassium were adsorbed onto the biochar. Desorption from human urine–adsorbed biochar produced a solution with 236.5 mg/L N, 256.73 mg/L P, and 4.6 mg/L K, which was then used to grow <i>O. basilicum </i>L<i>.</i> in comparison with the Hoagland solution. The growth indexes of the plants were slightly lower but comparable in statistical perspectives. Nevertheless, the nutritional profile was better and the economic efficiency was superior, thanks to the low costs in nutrient preparation. A potential mass production of hydroponic nutrients based on human urine adsorption–desorption, which also resolves wastewater issue was subsequently asserted for future application.</p>

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Evaluation of adsorption and desorption of wastewater onto rice husk biochar on the course of hydroponic nutrient production

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Quang Van Nguyen,
  • Khai Manh Nguyen,
  • Hung The Nguyen,
  • Tuan Dinh Duong,
  • Mai Ngoc Thi Dong,
  • Hang Minh Thi Tran,
  • Hung Van Hoang

摘要

Wastewater management nowadays targets simultaneously contaminant removal and further utilization while the operation needs to be affordable and comprehensible. This study investigates the adsorption of pristine human urine and the secondary effluent wastewater onto rice husk biochar and subsequently producing hydroponic nutrients using desorption for growing Ocimum basilicum L. (O.basilicum L.). SEM, BET, EDS, XRD, and FTIR were employed to characterize the adsorbent. The results demonstrated that rice husk biochar exhibited excellent adsorption performance, with total organic carbon adsorption efficiency ranging from 60 to 80%, depending on the type of wastewater. Also, 50% of total nitrogen, 70% of phosphorus, and about 80% of potassium were adsorbed onto the biochar. Desorption from human urine–adsorbed biochar produced a solution with 236.5 mg/L N, 256.73 mg/L P, and 4.6 mg/L K, which was then used to grow O. basilicum L. in comparison with the Hoagland solution. The growth indexes of the plants were slightly lower but comparable in statistical perspectives. Nevertheless, the nutritional profile was better and the economic efficiency was superior, thanks to the low costs in nutrient preparation. A potential mass production of hydroponic nutrients based on human urine adsorption–desorption, which also resolves wastewater issue was subsequently asserted for future application.