Berta Kinga M, Kurdi Róbert, Lukács Pál, Penk Márton, Somogyi Viola
University of Pannonia, Sustainable Solutions Research Laboratory, Veszprém, Hungary.
University of Pannonia, Centre of Competence for Sustainability and Circular Economy, Veszprém, Hungary.
J Environ Manage. 2021 Jun 1;287:112311. doi: 10.1016/j.jenvman.2021.112311. Epub 2021 Mar 19.
Despite efforts to utilise bauxite residue, the amount of red mud stored in reservoirs is increasing. This paper aims to evaluate the potential of red mud and other sludge waste types as a soil substitute by monitoring plant development. Pot experiments were carried out testing two types of mixtures: dredging sludge from Lake Balaton mixed with garden soil and the sewage sludge and soil blend. These were then treated with red mud (15 and 30% w/w). The plants were under-, while the roots were more developed in the sewage sludge mix than the dredging sludge blend and the control soil. In the sewage amendment, the phosphorous content increased while the calcium content was lower than in the other soil types and the optimum. The metals uptake of the plants was a factor of the red mud quantity. Lead, nickel, titanium and silicon had elevated concentrations parallel to higher red mud content, but only the nickel exceeded the threshold of the Hungarian legislation. Silicon and titanium were beneficial for plant growth, compensating for the potentially toxic effects of lead and nickel. Results suggest that the red mud in a mixture with either sewage sludge or dredging sludge can act as catalysts for the growth rate of test plants, allowing their utilisation as secondary raw materials.
尽管人们努力利用铝土矿残渣，但水库中储存的赤泥量仍在增加。本文旨在通过监测植物生长情况来评估赤泥及其他类型污泥废弃物作为土壤替代品的潜力。进行了盆栽试验，测试了两种混合物：巴拉顿湖疏浚污泥与花园土壤的混合物以及污水污泥与土壤的混合物。然后用赤泥（15%和30%重量/重量）对这些混合物进行处理。地上部分植物生长欠佳，而在污水污泥混合物中，植物根系比疏浚污泥混合物和对照土壤中的根系发育得更好。在添加污水污泥的情况下，磷含量增加，而钙含量低于其他土壤类型及最佳值。植物对金属的吸收量是赤泥用量的一个影响因素。铅、镍、钛和硅的浓度随着赤泥含量的增加而升高，但只有镍超过了匈牙利法规的阈值。硅和钛对植物生长有益，可补偿铅和镍的潜在毒性作用。结果表明，与污水污泥或疏浚污泥混合的赤泥可作为受试植物生长速率的催化剂，使其能够作为二次原料加以利用。
