Duwiejuah Abudu Ballu, Adjei Emmanuel Frimpong, Alhassan Elliot Haruna
Department of Biotechnology and Molecular Biology, Faculty of Biosciences, University for Development Studies, Tamale, Ghana.
Department of Aquaculture and Fisheries Sciences, Faculty of Biosciences, University for Development Studies, Tamale, Ghana.
Heliyon. 2024 Sep 20;10(18):e38189. doi: 10.1016/j.heliyon.2024.e38189. eCollection 2024 Sep 30.
The discharge of wastewater into ground and surface waters can cause human and ecological health problems, hence eco-friendly, sustainable and cost-effective methods for removing toxic metals from wastewater are required. The study employed coconut husk biochar and spent impra ginseng flavoured green tea to adsorb cadmium (Cd), chromium (Cr) and lead (Pb) from greywater. The adsorption capacity of coconut husk biochar ranged from 88.70 % to 98.20 % for cadmium, 78 %-96 % for chromium and 95.71 %-99.29 % for lead whilst the spent impra ginseng flavoured green tea ranged from 94.03 % to 96.87 % for cadmium, 52 %-74 % for chromium and 98.52 %-99.48 % for lead. The maximum adsorption capacity (Q) of coconut husk biochar ranged from 235.64 to 1132.40 mg/g for Cd, 1.31-8.80 mg/g for Cr and 58.85-415.80 mg/g for Pb. Lead demonstrated the highest affinity for the binding of coconut husk biochar and spent impra ginseng flavoured green tea adsorbent with a trend of Pb > Cd > Cr. Coconut husk biochar and spent impra ginseng flavoured green tea adsorbent were suitable for the toxic metals adsorption in the greywater. Cr showed different removal efficiencies where coconut husk biochar showed more effective removal than spent impra ginseng flavoured green tea. The application of coconut husk biochar and spent impra ginseng flavoured green tea in wastewater treatment is a green technology means and can lead to zero pollution of freshwater.
将废水排放到地下水和地表水中会引发人类健康和生态问题，因此需要采用环保、可持续且具有成本效益的方法来去除废水中的有毒金属。该研究采用椰壳生物炭和废弃的人参风味绿茶来吸附灰水中的镉（Cd）、铬（Cr）和铅（Pb）。椰壳生物炭对镉的吸附容量为88.70%至98.20%，对铬的吸附容量为78% - 96%，对铅的吸附容量为95.71% - 99.29%；而废弃的人参风味绿茶对镉的吸附容量为94.03%至96.87%，对铬的吸附容量为52% - 74%，对铅的吸附容量为98.52% - 99.48%。椰壳生物炭对Cd的最大吸附容量（Q）为235.64至1132.40mg/g，对Cr为1.31 - 8.80mg/g，对Pb为58.85 - 415.80mg/g。铅对椰壳生物炭和废弃的人参风味绿茶吸附剂的结合表现出最高的亲和力，其趋势为Pb > Cd > Cr。椰壳生物炭和废弃的人参风味绿茶吸附剂适用于灰水中有毒金属的吸附。Cr表现出不同的去除效率，其中椰壳生物炭的去除效果比废弃的人参风味绿茶更有效。椰壳生物炭和废弃的人参风味绿茶在废水处理中的应用是一种绿色技术手段，可实现淡水零污染。
