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Article

Removal of Phosphate from Wastewater with a Recyclable La-Based Particulate Adsorbent in a Small-Scale Reactor

School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
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Academic Editor: Laura Bulgariu
Water 2022, 14(15), 2326; https://doi.org/10.3390/w14152326
Received: 22 June 2022 / Revised: 15 July 2022 / Accepted: 22 July 2022 / Published: 27 July 2022
(This article belongs to the Section Wastewater Treatment and Reuse)
It is crucial to develop an effective and easily recoverable phosphate absorbent for the control of eutrophication problems in polluted rivers. In this study, a stable particulate adsorbent with a diameter of 5 mm synthesized from lanthanum, activated carbon, and zeolite (La-CZ) was developed, characterized, and tested for the removal of phosphate from wastewater in a small-scale reactor, which was designed to easily recycle La-CZ with a basket. Batch studies showed that La-CZ could reach adsorption equilibrium within 2 h and the maximum phosphate sorption capacity was 18.2 mg g−1. The experimental data showed good compliance with the Langmuir isotherm model and pseudo-second-order kinetic model, implying that chemisorption dominates the phosphate uptake process. La-CZ exhibited a stable adsorption capacity over a wide pH range (3–7), while the adsorption capacity decreased slightly under alkaline conditions. Although Nitrates (NO3) and Carbonate (CO32−) had some effects, normal coexisting ions such as Chloride (Cl), Sulfate (SO42−), and Fluorine (F) had no significant effects on the phosphate adsorption capacity of La-CZ. The main form of phosphate removed from the reaction system was HCl-P (77.68%), as determined through phosphorus fractionation. In particular, this study designed a replaceable filler-type reactor integrating a reflux and aeration system, 98.8% of phosphorus could be removed from actual wastewater, and La-CZ could be reclaimed easily. This work provides an excellent reference for particulate adsorbents that can efficiently remove phosphate in practical applications in the future. View Full-Text
Keywords: particulate adsorbent; lanthanum; practical application; adsorption mechanism; reactor independently developed particulate adsorbent; lanthanum; practical application; adsorption mechanism; reactor independently developed
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MDPI and ACS Style

Zhang, Y.; Yang, K.; Fang, Y.; Ding, J.; Zhang, H. Removal of Phosphate from Wastewater with a Recyclable La-Based Particulate Adsorbent in a Small-Scale Reactor. Water 2022, 14, 2326. https://doi.org/10.3390/w14152326

AMA Style

Zhang Y, Yang K, Fang Y, Ding J, Zhang H. Removal of Phosphate from Wastewater with a Recyclable La-Based Particulate Adsorbent in a Small-Scale Reactor. Water. 2022; 14(15):2326. https://doi.org/10.3390/w14152326

Chicago/Turabian Style

Zhang, Yinan, Kexin Yang, Yuxin Fang, Jiafeng Ding, and Hangjun Zhang. 2022. "Removal of Phosphate from Wastewater with a Recyclable La-Based Particulate Adsorbent in a Small-Scale Reactor" Water 14, no. 15: 2326. https://doi.org/10.3390/w14152326

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