G Tsadik Yordanos Kiros, Hailu Abrha Mulu, Asfaw Seyoum Leta, Mekonnen Yedilfana Setarge
Center for Environmental Science, College of Natural and Computational Sciences, Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.
Department of Chemistry, College of Natural and Computational Sciences, Aksum University, P.O. Box 1010, Axum, Ethiopia.
Heliyon. 2020 Dec 1;6(12):e05573. doi: 10.1016/j.heliyon.2020.e05573. eCollection 2020 Dec.
Biochar has gained an attention in reducing the bio-availability of toxic heavy metals and minimize threat of entering into food chain from contaminated soil. This study was aimed at evaluating the potential use of brewery sludge biochar (BSB) as a soil amendment for reducing cadmium bio-availability and uptake by in a pot experiment. In this pot experiment, artificially cadmium spiked, moderately fertile, and slightly basic silty-loam soil was used. The biochar was produced by pyrolyzing of the brewery sludge at 500 °C. The obtained biochar was sieved with 0.5 mm mesh size and applied at the rate of 4 % (w/w) on the grown cadmium spiked soil. The additions of BSB to the soil contributed a significant reduction of the bio-availability of cadmium in the soil and its accumulation in the shoot of by 86% and 93%, respectively. Besides, it remarkably increased the dry weight of the edible part of by 228% The results revealed that BSB is very effective additive in cadmium immobilization, in turn, significantly (p-value = 0.00) promoting vegetable () growth. Therefore, BSB can be used as agricultural soil remedy for cadmium contamination and as safe disposal of brewery sludge.
生物炭在降低有毒重金属的生物有效性以及减少受污染土壤中重金属进入食物链的威胁方面受到了关注。本研究旨在通过盆栽试验评估啤酒厂污泥生物炭（BSB）作为土壤改良剂降低镉生物有效性及镉吸收的潜力。在该盆栽试验中，使用了人工添加镉的、中等肥力且微碱性的粉质壤土。生物炭通过在500℃下热解啤酒厂污泥制备而成。将获得的生物炭过0.5毫米筛网，并以4%（w/w）的比例施用于添加了镉的种植土壤中。向土壤中添加BSB显著降低了土壤中镉的生物有效性及其在植株地上部分的积累，分别降低了86%和93%。此外，它使植株可食用部分的干重显著增加了228%。结果表明，BSB在固定镉方面是非常有效的添加剂，进而显著（p值 = 0.00）促进了蔬菜（）的生长。因此，BSB可作为镉污染农业土壤的改良剂以及啤酒厂污泥的安全处置方式。
