Abstract

Application of municipal biosolids in agriculture present a concern with potential uptake and bioaccumulation of pharmaceutical compounds from biosolids into agronomic plants. We evaluated the efficacy of biochar as a soil amendment to minimize uptake of antimicrobial agents (ciprofloxacin, triclocarban, and triclosan) in lettuce (Lactuca sativa) and carrot (Daucus carota) plants. Biochar reduced the concentration of ciprofloxacin and triclocarban in lettuce leaves and resulted in a 67% reduction of triclosan in carrot roots. There was no substantial difference in pharmaceutical concentrations in carrot and lettuce plant matter at low (2.0 g kg⁻¹ soil) and high (20.4 g kg⁻¹ soil) rates of applied biochar. The co-amendment of biochar and biosolids increased soil pH and nutrient content which were positively correlated with an increase in lettuce shoot biomass. Our results demonstrate the potential efficacy of using walnut shell biochar as a sorbent for pharmaceutical contaminants in soil without negatively affecting plant growth.

摘要

市政生物固体在农业中的应用引起了人们对从生物固体到农艺植物中药物化合物的潜在吸收和生物积累的关注。我们评估了生物炭作为土壤改良剂的功效，以最大程度减少生菜（Lactuca sativa）和胡萝卜（Daucus carota）植物中抗菌剂（环丙沙星，三氯卡班和三氯生）的吸收。Biochar降低了莴苣叶中环丙沙星和三氯卡班的浓度，并使胡萝卜根中的三氯生减少了67％。在低（2.0 g kg ^-1土壤）和高（20.4 g kg ^-1土壤）和胡萝卜和莴苣植物中，药物浓度没有实质性差异土壤）的生物炭施用率。生物炭和生物固体的共同修正增加了土壤的pH值和养分含量，这与生菜芽生物量的增加呈正相关。我们的结果证明了使用核桃壳生物炭作为吸附剂对土壤中的药物污染物的潜在功效，而不会负面影响植物的生长。