Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; Center of Wastewater Resource Recovery, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; International Magnesium Institute, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; Center of Wastewater Resource Recovery, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
J Hazard Mater. 2022 Apr 15;428:128213. doi: 10.1016/j.jhazmat.2022.128213. Epub 2022 Jan 5.
Pretreatment is widely used in sludge dewatering, however, its potentially impact on the subsequent sludge agricultural applications is often neglected. Here, the potential benefits and risks of the sludge with no pretreatment and with four most commonly used pretreatment methods in sludge agricultural applications were assessed using potted lettuce, an experimental crop. The results show that sewage sludge pretreatment methods can greatly affect its agricultural applications. The application of different pretreatment methods can potentially reduce the harm caused by pathogens. At low dosage (0.2 g kg), different sludge fertilizers promoted an increase in crop yield of 14.6% to 49.1%, and the concentrations of heavy metals in the crop and soil were controlled within safe ranges. At high dosage (8 g kg), crop yield using pretreated sludge (except anaerobic digestion) decreased by between 32.7% and 57.5%, but heavy metal pollution of both crop and soil increased. In terms of promoting crop growth and reducing heavy metal accumulation, untreated sludge was better than pretreated sludges and sludge with physical pretreatments was better than that with chemical pretreatments. Overall, this study clearly shows that the introduction of pretreatment in sludge dewatering can inevitably impact its agricultural land application.
预处理广泛应用于污泥脱水，但往往忽视了其对后续污泥农业应用的潜在影响。在这里，使用盆栽生菜这一实验作物，评估了未经预处理以及污泥农业应用中最常用的四种预处理方法对污泥的潜在益处和风险。结果表明，污泥的预处理方法会极大地影响其农业应用。应用不同的预处理方法可以潜在地减少病原体造成的危害。在低剂量（0.2 g/kg）下，不同的污泥肥料促进了作物产量增加 14.6%至 49.1%，且重金属在作物和土壤中的浓度控制在安全范围内。在高剂量（8 g/kg）下，除厌氧消化外，经预处理污泥的作物产量下降了 32.7%至 57.5%，但作物和土壤中的重金属污染增加。就促进作物生长和减少重金属积累而言，未经处理的污泥优于经预处理的污泥，而物理预处理的污泥优于化学预处理的污泥。总的来说，本研究清楚地表明，在污泥脱水过程中引入预处理不可避免地会影响其农业土地应用。
