4.7 Article

Phosphorus recovery and reuse in water bodies with simple ball-milled Ca-loaded biochar

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SCIENCE OF THE TOTAL ENVIRONMENT
卷 860, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.scitotenv.2022.160502

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Ball milling; Modified biochar; Adsorbent; Phosphorus recovery; Slow-release fertilizer

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In this study, ball-milled Ca-loaded biochar (BMCa@BC) composites were successfully prepared for phosphorus recovery from water bodies. BMCa@BC exhibited a high adsorption capacity of 329 mg P/g and involved various mechanisms such as hydrogen bonding, electrostatic attraction, complexation, and surface precipitation. The phosphorus recovered by BMCa@BC had high bioavailability and low loss, and showed potential as a slow-release fertilizer. After regeneration cycles, BMCa@BC still maintained good adsorption recovery, and the P-enriched desorption solution could be recovered as Ca-P products with fertilizer value. Overall, BMCa@BC showed good cost-effectiveness and practical applicability in phosphorus recovery.
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) compos-ites were prepared with CaO and corn stover biochar as raw materials by a new ball-milling method to recover phos-phorus 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, complex-ation, 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.

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