Ammonia recovery from landfill leachate using hydrophobic membrane contactors

2016 ◽  
Vol 74 (9) ◽  
pp. 2177-2184 ◽  
Author(s):  
Míriam C. S. Amaral ◽  
Nátalie C. Magalhães ◽  
Wagner G. Moravia ◽  
Carolina D. Ferreira
Keyword(s):  
Sulfuric Acid ◽  
Flow Rate ◽  
Landfill Leachate ◽  
Hollow Fiber Membrane ◽  
Ammonia Removal ◽  
Solution Ph ◽  
Hydrophobic Membrane ◽  
Ammonia Content ◽  
Ammonia Recovery ◽  
Membrane Contactors

This article aims to evaluate membrane contactors capability to remove and recover ammonia from landfill leachate (LFL). A hydrophobic hollow fiber membrane module was used to achieve such purpose. A sulfuric acid diluted solution was used as extraction solution to speed up ammonia content removal. Several factors that have influence on ammonia removal and recovery capability such as ammonia solution pH, concentration of sulfuric acid solutions and flow rate of liquid phases have been examined. Microfiltration was the method used as pretreatment. The results have shown that membrane contactor operated with LFL (pH 10), 0.1 M acid solution and liquid flow rate up to 0.5 L min−1 achieved 99.9% of ammonia removal, which corresponds to 79.1% of ammonia recovery from the extraction solution, and it is capable to produce highly purified ammonium sulfate solutions (41.2%, wt wt−1) to be used as fertilizer. The concentration of total ammonia nitrogen (TAN) in the residual LFL complies with Brazilian law requirements of 20.0 mg L−1 of TAN, regarding the disposal of effluents.

scholarly journals CO₂ STRIPPING FROM DIETHANOLAMINE USING MEMBRANE CONTACTORS: MODEL VALIDATION AND MEMBRANE WETTABILITY

2019 ◽  
Vol 81 (6) ◽  
Author(s):  
H. N. Mohammed ◽  
Omar S. Lateef ◽  
Ghassan H. Abdullah ◽  
A. L. Ahmad
Keyword(s):  
Liquid Phase ◽  
Flow Rate ◽  
Polyvinylidene Fluoride ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co Stripping ◽  
Sweeping Gas ◽  
Membrane Contactors ◽  
The Impact

In the present work, CO2 desorption (stripping) from diethanolamine (DEA) solution using polyvinylidene fluoride hollow fiber membrane contactor is theoretically investigated. A comprehensive two dimensional mathematical model is developed to evaluate the membrane wettability when DEA solution is used at different operating conditions such as sweeping gas flow rate, initial CO2 loading and liquid phase temperature. In addition, the impact of flow rate of liquid phase on the CO2 stripping performance was theoretically investigated. The simulated results were compared with the experimental data obtained from literature. The results revealed that the PVDF membrane was suffered from wetting at studied operating conditions.

scholarly journals CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 496
Author(s):  
Sayali Ramdas Chavan ◽  
Patrick Perré ◽  
Victor Pozzobon ◽  
Julien Lemaire
Keyword(s):  
Hollow Fiber ◽  
Recovery Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Fiber Membrane ◽  
Residual Content ◽  
Membrane Contactors ◽  
Ph Swing

Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

scholarly journals Olefin/Paraffin Separation using Ceramic Hollow Fiber Membrane Contactors

2012 ◽  
Vol 44 ◽  
pp. 662-665 ◽  
Author(s):  
R. Faiz ◽  
M. Fallanza ◽  
I. Ortiz ◽  
K. Li
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Membrane Contactors

scholarly journals A polyethersulfone–bisphenol sulfuric acid hollow fiber ultrafiltration membrane fabricated by a reverse thermally induced phase separation process

RSC Advances ◽  
2018 ◽  
Vol 8 (14) ◽  
pp. 7800-7809 ◽  
Author(s):  
Sheng-Hui Liu ◽  
Min Liu ◽  
Zhen-Liang Xu ◽  
Yong-Ming Wei
Keyword(s):  
Phase Separation ◽  
Sulfuric Acid ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Ultrafiltration Membrane ◽  
Separation Process ◽  
Thermally Induced Phase Separation ◽  
Fiber Membrane ◽  
Thermally Induced ◽  
Phase Separation Process

A novel antifouling polyethersulfone (PES) hollow fiber membrane was modified by the addition of bisphenol sulfuric acid (BPA-PS) using a reverse thermally induced phase separation (RTIPS) process.

Mass transfer simulation of solvent extraction in hollow-fiber membrane contactors

Desalination ◽  
2011 ◽  
Vol 275 (1-3) ◽  
pp. 126-132 ◽  
Author(s):  
Farzad Fadaei ◽  
Saeed Shirazian ◽  
Seyed Nezameddin Ashrafizadeh
Keyword(s):  
Mass Transfer ◽  
Solvent Extraction ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Membrane Contactors

scholarly journals Stripping of CO2 in Post-combustion Capture with Chemical Solvents: Intensification Potential of Hollow Fiber Membrane Contactors

2017 ◽  
Vol 114 ◽  
pp. 1334-1341 ◽  
Author(s):  
David Albarracin-Zaidiza ◽  
Bouchra Belaissaoui ◽  
Denis Roizard ◽  
Eric Favre ◽  
Sabine Rode
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Membrane Contactors
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