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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Article number26
JournalBiochar
Volume5
Issue number1
DOIs
Publication statusPublished - Dec 2023

Keywords

  • Biomass pre-puffing
  • Cost–benefit analysis
  • Engineered biochar
  • Nutrient recovery
  • Wastewater engineering

ASJC Scopus subject areas

  • Biomaterials
  • Environmental Science (miscellaneous)
  • Soil Science
  • Pollution

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