Phosphorus capturing from biogas slurry using different adsorbents: adsorption and mechanism
Mingda Li1, Mengfei Li1, Xin Li2
1College of Engineering, China Agricultural University (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), Beijing 100083, China.
Summary
Biomass power plant residues, particularly BPP-slag, effectively remove phosphorus from biogas slurry. This sustainable method prevents water pollution and recycles valuable nutrients.
Area of Science:
- Environmental Science
- Waste Management
- Materials Science
Background:
- Biogas slurry application can cause farmland pollution and water eutrophication.
- Phosphorus recovery from biogas slurry is crucial for environmental protection and resource utilization.
Purpose of the Study:
- To evaluate the efficiency of biochars and biomass power plant residues in adsorbing soluble phosphorus from biogas slurry.
- To identify the optimal adsorbent and understand the adsorption mechanism.
Main Methods:
- Systematic evaluation of adsorption efficiency using corn straw biochar (CSB), cherry wood biochar (CWB), cattle manure biochar (CMB), biomass power plant residues ash (BPP-ash), and slag (BPP-slag).
- Physicochemical characterization, kinetic and isotherm analyses (pseudo-second-order, Freundlich models), and X-ray diffraction (XRD) were employed.
- Quantitative analysis to determine the primary adsorption mechanism.
Main Results:
- Biomass power plant residues slag (BPP-slag) achieved the highest soluble phosphorus removal efficiency (92.17%) at a 30 g L-1 dosage.
- Adsorption followed pseudo-second-order kinetics and Freundlich isotherms, indicating chemisorption-dominated multilayer adsorption.
- Mineral precipitation was the primary mechanism, contributing over 70% to total phosphorus adsorption.
Conclusions:
- Biomass power plant residues are effective and cost-efficient adsorbents for phosphorus capture from biogas slurry.
- This study presents a sustainable approach for waste valorization and mitigation of environmental pollution.
- BPP-slag's high metal oxide content (Ca2+, Mg2+) contributes to its superior phosphorus removal capability.
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