Journal
CHEMICAL ENGINEERING JOURNAL
Volume 449, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137818
Keywords
Biochar; Constructedwetland; Hydrothermal; Inner-spherecomplexation; Lanthanum; Phosphorus
Categories
Funding
- Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2020CXGC011406]
- National Natural Science Foundation of China [51878388, 52170043]
- Natural Science Foundation of Shandong Province [ZR2020YQ42]
- Future Plan for Young Scholar of Shandong University
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The use of a novel La-A-HC modified substrate in constructed wetland (CW) can enhance phosphorus (P) removal performance. La-A-HC shows satisfactory P adsorption ability and can form La-O-P inner-sphere complexes, improving P removal efficiency. Additionally, the dissolved organic matter (DOM) in La-A-HC promotes microbial growth and enhances plant's ability to utilize light.
The defective phosphorus (P) removal performance of biochar (BC) inhibited its application in constructed wetland (CW). In this study, a novel Lanthanum-ammonia-modified hydrothermal biochar (La-A-HC) was pre-pared and used as a modified substrate for CW to enhance its P removal. Results showed that La-A-HC had satisfactory P adsorption ability (qm = 43.1 mg P/g) under various pH, ionic strength, and competing ions. TP removal rate of La-A-HC modified CW (i.e., La-CW) was 14.8% higher than CW modified with BC, which was mainly attributed to the formation of La-O-P inner-sphere complexation. Substrate adsorption accounted for 90.9% of P removal in La-CW. Furthermore, the dissolved organic matter (DOM) of La-A-HC promoted the growth of gamma-Proteobacteria and the proliferation of phosphate accumulating organisms (PAOs, 4.02 +/- 0.03 x 10(5) copy numbers g(-1)). The plants in La-CW also showed higher photosynthesize rate since La-A-HC enhanced its tolerance to stronger light.
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