Application of magnetic particles for phosphorus removal from domestic wastewater

Name: Le Thi, Giang Truc

keyword: Phosphorus

; Magnetic particles

; Domestic wastewater

Abstract: Phosphorus is a major element presence in many areas of our lives, but excess phosphorus in surface water may lead to eutrophication and result in degradation of water quality. The aim of this study is to investigate the removal of phosphorus (P) from domestic wastewater employing magnetic particles (MP) that are inexpensively synthesized by a chemical co-precipitation method. This MP was explored for the phosphorus adsorption capacity, the regeneration and recovery using sodium hydroxide. In addition, other factors that may cause effect on the sorption process were also investigated, such as pH, contact time, temperature. Using Langmuir model, the maximum P adsorption capacity determined is 44.8 mg P/g MP with the correlation coefficient R2 of 0.98. The kinetics of removal is very fast and reaches equilibrium within 2 hours of contact time. It also performs well over wide pH range ; for the pH range of 2-6 and initial [P] of 10 ppm, the removal efficiency of this MP is more than 95%. In real wastewater, the amount of P that has been adsorbed is higher than in simulated P solution (4.5 mg/g in wastewater vs. 2.7 mg/g in simulated solution at initial [P] of ~10 ppm). It was found the presence of Ca or Mg may improve the P removal efficiency by the MP. Using simulated solution of Ca and P or Mg and P, the application of MP was found to be able to reduce both species synergistically since this MP acts as nucleating surface to accelerate the co-precipitation. The spent MP can be regenerated using NaOH or KOH, and still possesses greater than 90% removal efficiency after 5 cycles of regeneration. The desorption efficiency using NaOH as regenerant is more than 90% (g P desorbed/ g P adsorbed) compare with that of 50% when using DI-water. The highest concentration of P desorbed in KOH 1M is 230 mg P/L KOH. The ATR-FTIR spectra was also taken to represent the presence and absence of phosphate group onto the MP before and after regenerated, respectively

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Paiboon Sreearunothai

Role: advisor

Name: Rachnarin Nitisoravut

Role: co-advisor

Created: 2014

Modified: 2022-01-19

Issued: 2022-01-19

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2014.27

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Engineering Technology

Grantor: Thammasat University

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