Effect of corn pre-puffing on the efficiency of MgO-engineered biochar for phosphorus recovery from livestock wastewater: mechanistic investigations and cost benefit analyses
Yaru Peng , Yuan Luo , Yimeng Li , Muhammad Azeem , Ronghua Li , Chuchu Feng , Guangzhou Qu , Esmat F. Ali , Mohamed A. Hamouda , Peter S. Hooda , Jörg Rinklebe , Ken Smith , Zengqiang Zhang , Sabry M. Shaheen
Biochar ›› 2023, Vol. 5 ›› Issue (1)
Effect of corn pre-puffing on the efficiency of MgO-engineered biochar for phosphorus recovery from livestock wastewater: mechanistic investigations and cost benefit analyses
To improve the phosphorus (P) recovery efficiency from livestock wastewater, a novel MgO doped mildewed corn biochar with thermal pre-puffing treatment (Mg-PBC) and without pre-puffing (Mg-BC) was synthesized and tested. The thermal-puffing pretreatment improved the effectiveness of metal soaking and MgO dispersion. P recovery time with Mg-PBC (7 h) was significantly shorter than that with Mg-BC (12 h). Moreover, Mg-PBC showed significantly higher P recovery capacity (241 mg g−1) than Mg-BC (96.6 mg g−1). P recovery capacity of the Mg-PBC fitted to the Thomas model was 90.7 mg g−1, which was 4 times higher than that of Mg-BC (22.9 mg g−1) under column test conditions. The mechanisms involved in P recovery included precipitation, surface complexation, and electrostatic interaction. After adsorption, both Mg-BC and Mg-PBC showed relatively low regeneration abilities. The P loaded Mg-BC (Mg-BC-P) and Mg-PBC (Mg-PBC-P), the later particularly, obviously increased the available P content and promoted plant growth. The release of P increased with time in the Mg-PBC-P treated soil, while it decreased with time in the P fertilizer treated soil. A cost–benefit analysis revealed that thermal-puffing pretreatment greatly increased the profit of MgO doped biochar from −0.66 to 5.90 US$ kg−1. These findings highlight that biomass pre-puffing is a feasible treatment to produce MgO modified biochar and to recover P from livestock wastewater, and that the Mg-PBC-P can be used as a slow-release P fertilizer.
• MgO doped biochar with (Mg-PBC) and without (Mg-BC) pre-puffing used for P recovery
• Thermal puffing improved the efficiencies of metal soaking and MgO dispersion
• Mg-PBC showed higher P recovery capacity (241 mg g-1) than Mg-BC (96.6 mg g-1)
• Precipitation, complexation, and electrostatic attraction controlled P recovery
• Biomass pre-puffing improve P recovery by MgO doped biochar
Innovative Research Group Project of the National Natural Science Foundation of China(32172679)
/
| 〈 |
|
〉 |
PDF
