An Investigation of Ammonia Extraction from Liquid Manure Using a Gas-Permeable Membrane

Mukhtar, Saqib; Majd, Amir Masoud Samani; Borhan, Saidul; Beseda, John Frank

doi:10.13031/2013.37764

Cited by 2 publications

(4 citation statements)

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“…The “base conditions” were a pH of 8.3, an initial TAN concentration of 1800 mg N-NH 3 L −1 , and room temperature (21–24 °C). Previous studies have found that pH of the liquid manure (or ammonium chloride) decreased as ammonia was captured and the TAN concentration decreased [7]. Within a continuously mixed AD, manure would consistently be added and removed at steady state, therefore maintaining near constant concentration and pH.…”

Section: Methodsmentioning

confidence: 99%

“…Increasing the flow rate of sulphuric acid throughout the GPM has shown to increase the ammonia capture concentration in the acid solution, with an approximately 30% increase from 5.6 mL·min −1 to 36 mL·min −1 [5]. Mukhtar et al [7] tested the surface area ratio of GPM to LM and found the optimal ratio to be 1:3.25 to achieve 50% ammonia extraction in less than 20 days. Over time, the pH of the acid solution increases as ammonium salt is formed, while the pH of the LM decreases [7].…”

Section: Introductionmentioning

confidence: 99%

“…Mukhtar et al [7] tested the surface area ratio of GPM to LM and found the optimal ratio to be 1:3.25 to achieve 50% ammonia extraction in less than 20 days. Over time, the pH of the acid solution increases as ammonium salt is formed, while the pH of the LM decreases [7]. Maintaining the recipient acid at pH of 2 (with an automated dosing pump and concentrated acid) resulted in the greatest removal of ammonia when compared to pH of 3, 4 and 5 [5].…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the Performance of Gas-Permeable Membranes as an Ammonia Recovery Strategy from Anaerobically Digested Dairy Manure

et al. 2017

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Capturing ammonia from anaerobically digested manure could simultaneously decrease the adverse effects of ammonia inhibition on biogas production, reduce reactive nitrogen (N) loss to the environment, and produce mineral N fertilizer as a by-product. In this study, gas permeable membranes (GPM) were used to capture ammonia from dairy manure and digestate by the diffusion of gaseous ammonia across the membrane where ammonia is captured by diluted acid, forming an aqueous ammonium salt. A lab-scale prototype using tubular expanded polytetrafluoroethylene (ePTFE) GPM was used to (1) characterize the effect of total ammonium nitrogen (TAN) concentration, temperature, and pH on the ammonia capture rate using GPM, and (2) to evaluate the performance of a GPM system in conditions similar to a mesophilic anaerobic digester. The GPM captured ammonia at a rate between 2.2 and 6.3% of gaseous ammonia in the donor solution per day. Capture rate was faster in anaerobic digestate than raw manure. The ammonia capture rate could be predicted using non-linear regression based on the factors of total ammonium nitrogen concentration, temperature, and pH. This use of membranes shows promise in reducing the deleterious impacts of ammonia on both the efficiency of biogas production and the release of reactive N to the environment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterizing the Performance of Gas-Permeable Membranes as an Ammonia Recovery Strategy from Anaerobically Digested Dairy Manure

et al. 2017

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“…This study investigates the use of an alternative technology based on expanded polytetrafluoroethylene (e-PTFE) gas-permeable passive membranes [3,8,9] that allows capturing NH 3 (g) in an acidic solution and recovering N in a concentrated and purified form, not dependent on intense air movement. This membrane material was selected as it is microporous, flexible, and hydrophobic, with a high permeability rate for low-pressure gas flow differentials between the inside and outside of the tube.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Ammonia Trapping Performance of Different Gas-Permeable Tubular Membrane System Configurations

et al. 2022

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The technology of gas-permeable tubular membranes (GPMs) is promising in reducing ammonia emissions from livestock manure, capturing NH3 in an acidic solution, and obtaining final products suitable for valorization as fertilizers, in line with the principles of the circular economy. This study aimed to evaluate the performance of several e-PTFE membrane systems with different configurations for the recovery of NH3 released from pig slurry. Ten different configurations were tested: only a submerged membrane, only a suspended membrane in the same chamber, only a suspended membrane in an annex chamber, a submerged membrane + a suspended membrane in the same chamber, and a submerged membrane + a suspended membrane in an annex chamber, considering in each case the scenarios without and with agitation and aeration of the slurry. In all tests, sulfuric acid (1N H2SO4) was used as the NH3 capture solution, which circulated at a flow rate of 2.1 L·h−1. The results showed that NH3-N removal rates ranged from 36–39% (for systems with a single submerged or suspended membrane without agitation or aeration of the slurry) to 70–72% for submerged + suspended GPM systems with agitation and aeration. In turn, NH3-N recovery rates were found to be between 44–54% (for systems with a single membrane suspended in an annex compartment) and 88–91% (for systems based on a single submerged membrane). However, when choosing a system for farm deployment, it is essential to consider not only the capture and recovery performance of the system, but also the investment and operating costs (ranging from 9.8 to 21.2 €/kg N recovered depending on the selected configuration). The overall assessment suggests that the simplest systems, based on a single membrane, may be the most recommendable.

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An Investigation of Ammonia Extraction from Liquid Manure Using a Gas-Permeable Membrane

Cited by 2 publications

References 0 publications

Characterizing the Performance of Gas-Permeable Membranes as an Ammonia Recovery Strategy from Anaerobically Digested Dairy Manure

Characterizing the Performance of Gas-Permeable Membranes as an Ammonia Recovery Strategy from Anaerobically Digested Dairy Manure

Comparison of the Ammonia Trapping Performance of Different Gas-Permeable Tubular Membrane System Configurations

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