The forward osmosis-pressure retarded osmosis (FO-PRO) hybrid system: A new process to mitigate membrane fouling for sustainable osmotic power generation

Cheng, Zhen Lei; Xue, Li; Chung, Tai‐Shung

doi:10.1016/j.memsci.2018.04.036

Cited by 68 publications

(24 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To alleviate the membrane fouling issue, Cheng et al (2018) have proposed to install FO as a pretreatment step prior to the PRO process (Fig. 5) [87]. In this context, wastewater retentate from a municipal water recycling plant was used as the feed solution while the draw solution was NaCl solution.…”

Section: Energy Generation and Resources Recoverymentioning

confidence: 99%

See 1 more Smart Citation

Unlocking the application potential of forward osmosis through integrated/hybrid process

Ang

Mohammad

Johnson

et al. 2020

Science of The Total Environment

View full text Add to dashboard Cite

Study of forward osmosis (FO) has been increasing steadily over recent years with applications mainly focusing on desalination and wastewater treatment processes. The working mechanism of FO lies in the natural movement of water between two streams with different osmotic pressure, which makes it useful in concentrating or diluting solutions. FO has rarely been 2 operated as a stand-alone process. Instead, FO processes often appear in a hybrid or integrated form where FO is combined with other treatment technologies to achieve better overall process performance and cost savings. This article aims to provide a comprehensive review on the need for hybridization/integration for FO membrane processes, with emphasis given to process enhancement, draw solution regeneration, and pretreatment for FO fouling mitigation. In general, integrated/hybrid FO processes can reduce the membrane fouling propensity; prepare the solution suitable for subsequent value-added uses and production of renewable energy; lower the costs associated with energy consumption; enhance the quality of treated water; and enable the continuous operation of FO through the regeneration of draw solution. The future potential of FO lies in the success of how it can be hybridized or integrated with other technologies to minimize its own shortcomings, while enhancing the overall performance.

show abstract

Section: Energy Generation and Resources Recoverymentioning

confidence: 99%

“…Integrated FO-PRO process for power generation (adapted from[87]). Bioelectrochemical systems such as microbial fuel cells and microbial electrolysis cells have emerged as one of the multipurpose processes for renewable energy production and wastewater treatment.…”

mentioning

confidence: 99%

Unlocking the application potential of forward osmosis through integrated/hybrid process

Ang

Mohammad

Johnson

et al. 2020

Science of The Total Environment

View full text Add to dashboard Cite

show abstract

“…where ∆G (J/mol) of mixing is the change in Gibbs energy and G B , G S , and G FW are the Gibbs energies of the resultant brackish water, the feed solution which is a concentrated salt solution, and the dilute solution (J/mol), respectively. Assuming the solutions are ideal, the chemical potential (μi) of component i in the solution can be presented as [9]…”

Section: Theoretical Potential Of Osmotic Pressure Gradient Energymentioning

confidence: 99%

“…In idealized scenarios, the RO-PRO system demonstrates improved performance as compared to the one-stage RO system due to the use of impaired water and use of less energy [8].The FO-PRO hybrid yields mild fouling on membranes up to 50% recovery. This is due to the presence of a diluted interloop (draw) solution which while leaving FO could be a clean feed to the PRO unit at minimum fouling tendency [9]. By the application of reverse electrodialysis technology, energy can be harvested from the mixing of salt and freshwater reversibly which uses mainly ion exchange membranes (IEMs) to energize the chemical potential difference between water molecules through concentration gradient [10].…”

Section: Introductionmentioning

confidence: 99%

Blue Energy and Its Potential: The Membrane Based Energy Harvesting

Lanjewar¹,

Mukherjee²,

Rehman³

et al. 2020

Advances in Membrane Technologies

View full text Add to dashboard Cite

The present energy generation is largely dependent on fossil fuels which results in the emission of greenhouse gases and is also characterized by vulnerability and eminent scarcity. In order to meet the respective concerns, the energy supply should be based on (i) an environmental-friendly non-combustion energy conversion, (ii) a freely available alternative energy source, and (iii) a renewable energy source. In this chapter, the authors want to explore an alternative and the hardly known renewable energy source, i.e. salinity gradient energy. It is the most promising renewable energy source and also termed as 'blue energy'. Estimates from literature predicted coverage of over 80% of the current global electricity demand when applied in all river mouths. From thermodynamic calculations, it can be derived that each m 3 of river water can yield 1.4 MJ when mixed with the same amount of seawater. Two membrane-based processes are available to convert blue energy into electricity: Pressure retarded osmosis (PRO) and Reverse electrodialysis (RED). Blue energy along with its technical and economic potential would be the major focus of this chapter.

show abstract

“…The results showed that PRO-FO system has higher efficiency than FO-PRO system. It also was found that feed solution flow rate has a negligible Cheng et al [127] investigated model simulations of full-scale FO-PRO hybrid system by choosing the salinity of the inter-loop solution to PRO as 0.1 M ( Figure 2.15). The study showed that with this hybrid, it is possible to reach a power density greater than 5 Wm −2 that makes the process economically feasible.…”

Section: Fo-pro Hybrid Systemsmentioning

confidence: 99%

Modeling and simulation of the dual stage pressure retarded osmosis systems

Soltani

Struchtrup

2019

Desalination

View full text Add to dashboard Cite

Utilization of renewable energy sources, as an approach to reduce greenhouse gas (GHG) emissions, have been globally popular in the last few decades. Among renewable energy sources, pressure retarded osmosis (PRO) has been scrutinized by scientists since the mid 70's. However, even today, the existing river-sea PRO systems can only marginally meet the generally approved criterion of 5 W/m 2 power density, a threshold for an economically feasible PRO system. As an approach to increase the performance of PRO systems, multi-staging of PRO modules are investigated. A mathematical model of the scaled up PRO process is proposed with consideration for internal and external concentration polarization, reverse salt flux, and spatial variations along the membrane. A thermodynamic model is also developed with consideration for entropy generation and losses in the process. It predicts the percentile of each work loss source compared to the net work in the system. Several configurations of dual stage PRO system are presented and compared to single stage PRO. The comparison is based on three proposed target functions of power density (PD), specific energy (SE), and work per drawn freshwater (W drawn). Applied hydraulic pressures and flow rates of draw and feed solutions are optimized for maximizing the target functions. The results indicate that overall performance of the system could be improved by up to 8 % with a dual stage PRO in the case of SE. The system iv performance is not improved by depressurizing the draw solution before the second module in cases of SE and W drawn. The thermodynamic analysis demonstrate the contribution of each work loss and justify the reason of diminishing the net work over the losses. The effect of membrane area and membrane characteristics on the SE target function is also investigated. The distribution of membrane area in each module depends on the selected configuration and inlet draw solution. In the dual stage systems, the SE value increases up to 14% by improving the membrane characteristics. Reducing the salt rejection coefficient (B) is the most effective membrane characteristic in our configurations. Replacing seawater with RO brine in draw solution results in a significant improvement in SE values.

show abstract

The forward osmosis-pressure retarded osmosis (FO-PRO) hybrid system: A new process to mitigate membrane fouling for sustainable osmotic power generation

Cited by 68 publications

References 48 publications

Unlocking the application potential of forward osmosis through integrated/hybrid process

Unlocking the application potential of forward osmosis through integrated/hybrid process

Blue Energy and Its Potential: The Membrane Based Energy Harvesting

Modeling and simulation of the dual stage pressure retarded osmosis systems

Contact Info

Product

Resources

About