Hollow fibre membrane contactors for ammonia recovery: Current status and future developments

Darestani, Mariam; Haigh, Victoria; Couperthwaite, Sara J.; Millar, Graeme J.; Nghiem, Long D.

doi:10.1016/j.jece.2017.02.016

Cited by 146 publications

(82 citation statements)

References 79 publications

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“…Thus, the weight of the acidic solution was more than 6-fold higher after 50 days of experimentation compared to the initial weight (Figure 4). Darestani et al [29] pointed out that the transfer of water vapor may occur during the TAN removal process using hydrophobic membranes due to differences in vapor pressure between both sides of the membrane (i.e., osmotic distillation or OD). This process could have a great impact on the economy of the process.…”

Section: Characterization Of the Acidic Solution Containing The Concementioning

confidence: 99%

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

et al. 2019

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Gas-permeable membrane technology is a new strategy to minimize ammonia losses from manure, reducing pollution and recovering N in the form of an ammonium salt fertilizer. In this work, a new operational configuration to recover N using the gas-permeable membrane technology from swine manure was tested in a semi-continuous mode. It treated swine manure with a total ammonia nitrogen (TAN) concentration of 3451 mg L−1. The system was operated with low aeration rate (to raise pH), and with hydraulic retention times (HRT) of seven days (Period I) and five days (Period II) that provided total ammonia nitrogen loading rate (ALR) treatments of 491 and 696 mg TAN per L of reactor per day, respectively. Results showed a uniform TAN recovery rate of 27 g per m2 of membrane surface per day regardless of the ALR applied and the manure TAN concentration in the reactor. TAN removal reached 79% for Period I and 56% for Period II, with 90% of recovery by the membrane in both periods. Water capture in the acidic solution was also uniform during the experimental period. An increase in temperature of 3 °C of the acidic solution relative to the wastewater reduced 34% the osmotic distillation and water dilution of the product. These results suggested that the gas-permeable membrane technology operating in a semi-continuous mode has a great potential for TAN recovery from manure.

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Section: Characterization Of the Acidic Solution Containing The Concementioning

confidence: 99%

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

et al. 2019

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“…An acid on the other side of the membrane drives the NH3 extraction by lowering the NH3 concentration (Amaral et al 2016, Bernal et al 2016, Dube et al 2016, Ulbricht et al 2013, Vanotti et al 2017. Hollow fiber configurations are commonly used because a large membrane surface area improves ammonia extraction rates and efficiencies (Darestani et al 2017). A combination of (microbial) electrochemical or fuel cells with column or membrane stripping units has the advantage to produce caustic in situ, eliminating the need for chemicals, which are a concern, not only for their costs, but also in terms of a safe and reliable supply (Arredondo et al 2017, Christiaens et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Membrane stripping enables effective electrochemical ammonia recovery from urine while retaining microorganisms and micropollutants

et al. 2019

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Ammonia recovery from urine avoids the need for nitrogen removal through nitrification/denitrification and re-synthesis of ammonia (NH3) via the Haber-Bosch process. Previously, we coupled an alkalifying electrochemical cell to a stripping column, and achieved competitive nitrogen removal and energy efficiencies using only electricity as input, compared to other technologies such as conventional column stripping with air. Direct liquid-liquid extraction with a hydrophobic gas membrane could be an alternative to increase nitrogen recovery from urine into the absorbent while minimizing energy requirements, as well as ensuring microbial and micropollutant retention. Here we compared a column with a membrane stripping reactor, each coupled to an electrochemical cell, fed with source-separated urine and operated at 20 A m-2. Both systems achieved similar nitrogen removal rates, 0.34 ± 0.21 and 0.35 ± 0.08 mol N L-1 d-1 , and removal efficiencies, 45.1 ± 18.4 and 49.0 ± 9.3%, for the column and membrane reactor, respectively. The membrane reactor improved nitrogen recovery to 0.27 ± 0.09 mol N L-1 d-1 (38.7 ± 13.5%) while lowering the operational (electrochemical and pumping) energy to 6.5 kWhe kg N-1 recovered, compared to the column reactor, which reached 0.15 ± 0.06 mol N L-1 d-1 (17.2 ± 8.1%) at 13.8 kWhe kg N-1. Increased cell concentrations of an autofluorescent E. coli MG1655+prpsM spiked in the urine influent were observed in the absorbent of the column stripping reactor after 24 h, but not for the membrane stripping reactor. None of six selected micropollutants spiked in the urine were found in the absorbent of both technologies. Overall, the membrane stripping reactor is preferred as it improved nitrogen recovery with less energy input and generated an E. coli-and micropollutant-free product for 3 potential safe reuse. Nitrogen removal rate and efficiency can be further optimized by increasing the NH3 vapor pressure gradient and/or membrane surface area.

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“…Membrane-based process units have a compact size, high efficiency, low maintenance, low-energy consumption, low capital investment, ease of operation, and high flexibility. [18][19][20][21][22][23][24][25][26][27][28] Membrane modeling can be done for a better material selection, adjusting the operating conditions and design of the membrane modules. The first H 2 /nitrogen (N 2 ) membrane separation unit in a large-scale industrial plant was implemented by Monsanto in the ammonia purge gas unit in 1980.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, many studies have been conducted in modeling and simulation of HFMCs by considering the influence of various parameters such as gas and liquid flow rates, absorbent types, fluid velocities, and pressure. [18][19][20][21][22][23][24][25][26][27][28] Membrane modeling can be done for a better material selection, adjusting the operating conditions and design of the membrane modules. Moreover, simulation of HFMs can help to predict optimum operating conditions for minimization of economic costs.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen recovery from ammonia purge gas by a membrane separator: A simulation study

Maarefian¹,

Bandehali

Azami

et al. 2019

Int J Energy Res

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Summary In this study, a two‐dimensional mathematical model is proposed for modeling the hollow fiber membrane (HFM) separators for hydrogen (H2) recovery unit implemented in the Razi Petrochemical Company (Imam Khomeini Port, Iran) to capture hydrogen from ammonia (NH3) purge gas. In this regard, computational fluid dynamics is applied to solve the equations of momentum and mass transfer in the laminar flow conditions. Axial and radial diffusion for mass transfer inside the membrane fibers and axial diffusion within the shell side of separator were considered. The distributions of concentration, velocity, and mass transfer fluxes were achieved by the model. As the new insights, the effects of feed flow rate and feed gas concentration on mass transfer of H2 were investigated. Moreover, fluid velocity profile and H2 fluxes in the tube (fiber), membrane, and shell sides of the HFM separator were studied. The results of simulation were compared with the industrial data and showed that the present developed model has excellent agreement with the experimental data with a low mean deviation value of 3.5%.

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Hollow fibre membrane contactors for ammonia recovery: Current status and future developments

Cited by 146 publications

References 79 publications

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

Membrane stripping enables effective electrochemical ammonia recovery from urine while retaining microorganisms and micropollutants

Hydrogen recovery from ammonia purge gas by a membrane separator: A simulation study

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