Institute of Agricultural Environmental Science, Hankyong National University, Anseong, 17579, Republic of Korea.
Department of Bioresources and Rural System Engineering, Hankyong National University, Anseong, 17579, Republic of Korea.
J Environ Manage. 2024 Nov;370:122763. doi: 10.1016/j.jenvman.2024.122763. Epub 2024 Oct 5.
Cadmium (Cd), a carcinogen, is released from industrial activities like metal refineries and battery runoff, with significant contamination reported near zinc smelters in Korea. This study addresses the issue using an efficient, economical adsorption process with waste-derived biochar-based adsorbents known for high Cd removal. Poultry manure (PM), typically used as fertilizer, can lead to environmental pollution if mismanaged; therefore, it was pyrolyzed to produce biochar. The resulting poultry manure biochar (PMBC) was produced on a large scale (15 ton/day), demonstrating feasibility for large-scale implementation. The effectiveness of PMBC as an adsorbent for Cd was evaluated using wastewater discharged from a zinc smelter. The Cd adsorption capacity of PMBC (60.39 mg/g) was lower than that (302.0 mg/g) of hen manure biochar produced at a laboratory scale in our previous study but was comparable to other biochars reported in the literature. Response surface methodology analysis indicated that reaction time, dose, and agitation significantly influenced Cd removal by PMBC, whereas pH had a negligible impact. Notable contributions to Cd adsorption include the release of K from PMBC and the presence of O-containing functional groups. Under continuous flow conditions with real wastewater, Cd was not detected in the effluent for the initial 8 h, and PMBC sustained a removal efficiency of 40.77% until saturation was reached. The results from wastewater treatment and large-scale biochar production offer valuable insights into the potential of biochar as a medium for addressing environmental issues in real-world applications.
镉（Cd）是一种致癌物质，它会从金属精炼厂和电池废水等工业活动中释放出来，韩国锌冶炼厂附近的报道显示存在严重的镉污染。本研究使用高效、经济的吸附工艺，使用以高镉去除率而闻名的基于废生物质的吸附剂来解决这个问题。家禽粪便（PM）通常用作肥料，如果管理不善，可能会导致环境污染；因此，它被热解制成生物炭。由此产生的家禽粪便生物炭（PMBC）是大规模生产的（15 吨/天），证明了其在大规模实施方面的可行性。使用从锌冶炼厂排放的废水来评估 PMBC 作为镉吸附剂的效果。PMBC 的镉吸附容量（60.39 mg/g）低于我们之前在实验室规模生产的鸡粪生物炭（302.0 mg/g），但与文献中报道的其他生物炭相当。响应面法分析表明，反应时间、剂量和搅拌对 PMBC 去除镉有显著影响，而 pH 的影响可以忽略不计。对镉吸附有显著贡献的包括 PMBC 中 K 的释放和含氧官能团的存在。在实际废水中的连续流动条件下，最初 8 小时内出水中未检测到镉，并且 PMBC 保持 40.77%的去除效率，直到达到饱和。废水处理和大规模生物炭生产的结果为生物炭作为解决实际应用中环境问题的介质提供了有价值的见解。
