| Characteristic and assessment of solvent and Mg/Al-LDH adsorption-based recovery of phosphorus from municipal sludge |
| Rong Fan, Lihui Zhang†, and Feng Duan† |
| School of Energy and Environment, Anhui University of Technology, Maanshan 243002, Anhui Province, PR China |
Corresponding Author:
Lihui Zhang ,Tel: +86-189-4963-8788 (L.Z.), +86-189-4963-8715 (F.D.) , Email: zhang_lh81@126.com (L.Z.), ddffeng@126.com (F.D.)
Feng Duan ,Tel: +86-189-4963-8788 (L.Z.), +86-189-4963-8715 (F.D.) , Email: zhang_lh81@126.com (L.Z.), ddffeng@126.com (F.D.)
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Received: July 26, 2024; Accepted: October 9, 2024. |
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| ABSTRACT |
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In this study, a new strategy of enriching phosphorus by degradative solvent extraction of sludge and phosphorus recovery with low-cost adsorbents was introduced. The phosphorus recovery performance of three unmodified, low-cost adsorbents was compared, and the effects of the adsorbent dosage, phosphorus concentration, and pH of the extraction solution on the adsorption efficiency of Mg/Al-LDH were studied. The adsorption mechanism of phosphorus in acid leaching environment was also discussed. Results show that phosphorus-rich extraction residue is successfully separated from sludge. Compared to other adsorbents, Mg/Al-LDH has stronger adsorption capacity, and its adsorption efficiency is 8 times and 1.7 times higher than that of activated alumina and bentonite, respectively. The adsorption equilibrium time is 90 seconds, with phosphorus concentrations ranging from 528 to 145 mg/l in an acidic environment, achieving a phosphorus recovery rate of up to 99%. The influence of the pH value is not obvious. The interface phenomenon of Mg/Al-LDH for phosphorus adsorption involves many physical and chemical processes, including physical adsorption, anion exchange and surface complexation. The results show that the scheme is economic and feasible, which can obviously reduce environmental pollution and has considerable economic and environmental benefits. |
| Keywords:
Adsorption | Degradative solvent extraction | Ion exchange | Municipal sludge | Phosphate recovery |
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