Optimization of adsorbent dose and contact time for the production of jackfruit waste nutrient-enriched biochar

Waste Disposal & Sustainable Energy Pub Date : 2023-01-27 DOI:10.1007/s42768-022-00123-1

Denis Nsubuga, Isa Kabenge, Ahamada Zziwa, Vianney Andrew Yiga, Yusufu Mpendo, Mawejje Harbert, Ronald Kizza, Noble Banadda, Kerstin D. Wydra

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引用次数: 3

Abstract

Raw biochar can be enriched with nutrients from digestates through adsorption producing nutrient-enriched biochar. The nutrient-enriched biochar can be used as a soil amendment to support sustainable agriculture. This study assessed the effect of adsorbent dose and contact time on the jackfruit waste biochar adsorption of essential nutrients of nitrogen, phosphors and potassium from the digestate. Response surface methodology (RSM) using central composite design (CCD) was utilized to optimize the adsorbent dose and contact time during the adsorption process. An adsorbent dose of 20–70 mg/g and contact time range of 48–120 h were used in this study. The optimal adsorbent dose and contact time were found to be 20 mg/g and 114.6 h, respectively. The corresponding optimum nitrogen, phosphorus and potassium adsorbed were 17.44, 20.94, and 21.36 mg/g, respectively. Models for the prediction of these values for nitrogen, phosphorus and potassium had R² values of 0.9801, 0.9804 and 0.9843, respectively, and non-significant lack of fit (p<0.05). This indicates the suitability of the models in predicting the adsorption conditions of adsorbent dose and contact time to produce high-quality nutrient-enriched biochar.

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吸附剂用量及接触时间的优化制备菠萝蜜废弃物富营养化生物炭

生生物炭可以通过吸附产生富营养化生物炭来富集消化液中的营养物质。富含营养的生物炭可以作为土壤改良剂来支持可持续农业。研究了吸附剂剂量和接触时间对菠萝蜜废弃物生物炭吸附消化液中氮、磷、钾等必需营养物质的影响。采用响应面法(RSM)和中心复合设计(CCD)对吸附过程中的吸附剂剂量和接触时间进行了优化。吸附剂的剂量为20 ~ 70 mg/g，接触时间为48 ~ 120 h。最佳吸附剂剂量为20 mg/g，接触时间为114.6 h。相应的最佳氮、磷、钾吸附量分别为17.44、20.94、21.36 mg/g。氮、磷、钾预测值的R2分别为0.9801、0.9804、0.9843，拟合不显著(p<0.05)。这表明该模型在预测吸附剂剂量和接触时间的吸附条件以生产优质富营养化生物炭方面具有适用性。图形抽象

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Waste Disposal & Sustainable Energy

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