School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
Sci Total Environ. 2023 Feb 20;860:160502. doi: 10.1016/j.scitotenv.2022.160502. Epub 2022 Nov 25.
The demand to control eutrophication in water bodies and the risk of phosphorus scarcity have prompted the search for treatment technologies for phosphorus recovery. In this study, ball-milled Ca-loaded biochar (BMCa@BC) composites were prepared with CaO and corn stover biochar as raw materials by a new ball-milling method to recover phosphorus from water bodies. Experimental results demonstrated that BMCa@BC could efficiently adsorb phosphorus in water bodies with an excellent sorption capacity of 329 mg P/g. Hydrogen bonding, electrostatic attraction, complexation, and surface precipitation were involved in adsorption process. In addition, phosphorus recovered by BMCa@BC had high bioavailability (86.7 % of TP) and low loss (3.3 % of TP) and was a potential slow-release fertilizer. P-laden BMCa@BC significantly enhanced seed germination and growth in planting experiments, proving that it could be used as a substitute for P-based fertilizer. After five cycles of regeneration, BMCa@BC still showed good adsorption recovery and the P-enriched desorption solution could be recovered as Ca-P products with the fertilizer value. Overall, BMCa@BC has good cost-effectiveness and practical applicability in phosphorus recovery. This provides a new way to recover and reuse phosphorus effectively.
水体富营养化的控制需求和磷资源短缺的风险促使人们寻求磷回收的处理技术。在这项研究中，以 CaO 和玉米秸秆生物炭为原料，采用新型球磨法制备了负载 Ca 的球磨生物炭（BMCa@BC）复合材料，用于从水体中回收磷。实验结果表明，BMCa@BC 可有效吸附水体中的磷，具有 329mg P/g 的优异吸附容量。吸附过程涉及氢键、静电吸引、络合和表面沉淀。此外，BMCa@BC 回收的磷具有较高的生物有效性（TP 的 86.7%）和较低的损失（TP 的 3.3%），是一种潜在的缓释肥料。负载磷的 BMCa@BC 显著促进了种植实验中的种子发芽和生长，证明它可用作磷基肥料的替代品。经过五次再生循环，BMCa@BC 仍表现出良好的吸附回收性能，富磷解吸液可回收为具有肥料价值的 Ca-P 产品。总体而言，BMCa@BC 在磷回收方面具有良好的成本效益和实际适用性。这为有效回收和再利用磷提供了一种新途径。
