Simultaneous removal of chloride and hardness from groundwater by cassava peel biosorption: Optimization and sorption studies

IF 3 Q3 ENGINEERING, ENVIRONMENTAL
Magori Jackson Nyangi
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引用次数: 0

Abstract

Abstract In this study, activated carbon produced from cassava peel (CP) via carbonization at 400°C was utilized as a biosorbent for the removal of chloride (Cl − ) and total hardness (TH) from groundwater. A response surface methodology (RSM) employing a Box–Behnken design (BBD) was implemented to optimize process parameters, including pH (3–10), biosorbent dosage (1–10 g), contact time (10–60 min), initial Cl − concentration (50–2000 mg/L), and initial TH concentration (40–900 mg/L). The biosorbent was applied in a batch reactor setup to evaluate its performance in removing Cl − and TH from groundwater under the optimized conditions. The experimental data showed good agreement with the model predictions, exhibiting R 2 of 0.991 and 0.905 for Cl − and TH removal, respectively. The CP biosorbent removed Cl − (245 mg/L) and TH (321 mg/L) by 84% and 90%, respectively, under optimal conditions of 6.9 g CP dose, 19.6 min, and initial pH of 8.1. The sorption kinetics followed a pseudo‐second‐order, and the equilibrium data fit the Freundlich and Langmuir models to Cl − and TH, respectively. The removal of Cl − and TH exhibited maximum adsorption capacities ( q m ) of 31.25 and 6.57 mg/g for Cl − and TH, respectively. Overall, CP shows potential as an adsorbent for remediating groundwater containing Cl − and TH.
木薯皮生物吸附同时去除地下水中的氯和硬度:优化和吸附研究
摘要:本研究以木薯皮(CP)为原料,在400℃下碳化制备活性炭,作为生物吸附剂去除地下水中的氯离子(Cl−)和总硬度(TH)。采用Box-Behnken设计(BBD)的响应面法(RSM)优化工艺参数,包括pH(3-10)、生物吸附剂用量(1-10 g)、接触时间(10-60 min)、初始Cl−浓度(50-2000 mg/L)和初始TH浓度(40-900 mg/L)。在间歇式反应器中,考察了该生物吸附剂在优化条件下对地下水中Cl−和TH的去除效果。实验数据与模型预测吻合较好,对Cl−和TH的去除率r2分别为0.991和0.905。在CP用量为6.9 g、19.6 min、初始pH为8.1的条件下,CP生物吸附剂对Cl−(245 mg/L)和TH (321 mg/L)的去除率分别为84%和90%。吸附动力学服从准二级,平衡数据分别符合Cl -和TH的Freundlich和Langmuir模型。对Cl−和TH的最大吸附量(q m)分别为31.25和6.57 mg/g。总的来说,CP作为一种吸附剂有潜力修复含Cl−和TH的地下水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.50
自引率
21.10%
发文量
37
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