In:
PLOS ONE, Public Library of Science (PLoS), Vol. 18, No. 8 ( 2023-8-25), p. e0290714-
Abstract:
The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca 2+ -modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca 2+ -modified soybean straw biochar exhibited excellent adsorption performance for NH 4 + –N (103.18 mg/g) and PO 4 3− −P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0290714
DOI:
10.1371/journal.pone.0290714.g001
DOI:
10.1371/journal.pone.0290714.g002
DOI:
10.1371/journal.pone.0290714.g003
DOI:
10.1371/journal.pone.0290714.g004
DOI:
10.1371/journal.pone.0290714.g005
DOI:
10.1371/journal.pone.0290714.g006
DOI:
10.1371/journal.pone.0290714.g007
DOI:
10.1371/journal.pone.0290714.g008
DOI:
10.1371/journal.pone.0290714.g009
DOI:
10.1371/journal.pone.0290714.t001
DOI:
10.1371/journal.pone.0290714.t002
DOI:
10.1371/journal.pone.0290714.t003
DOI:
10.1371/journal.pone.0290714.t004
DOI:
10.1371/journal.pone.0290714.t005
DOI:
10.1371/journal.pone.0290714.t006
DOI:
10.1371/journal.pone.0290714.s001
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2023
detail.hit.zdb_id:
2267670-3
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