Power generation with salinity gradient by pressure retarded osmosis using concentrated brine from SWRO system and treated sewage as pure water

Saito, Keiichiro; Irie, Morihiro; Zaitsu, Shintaro; Sakai, H.; Hayashi, H.; Tanioka, Akihiko

doi:10.1080/19443994.2012.664696

Cited by 171 publications

(95 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Energy savings of 30% in total, including energy savings of 20% with the SWRO of the "Mega-ton Water System" described in Section 2.3 are possible in the comparison with conventional seawater desalination system at technology 2010 ( Figure 18) [5,[22][23][24]. The calculation results of the demonstration operational results showed that installing a SWRO-PRO system reduces electricity consumption per unit necessary to produce water by 10% at megaton class (1,000,000 m 3 /d scale) water desalination facilities.…”

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

“…The prototype plant achieved 13.3 W/m 2 of the maximum membrane power density per surface area using 10-inch membrane modules. On the other hand, the lab-scale plant showed 17.1 W/m 2 with a five-inch module, as shown in Figure 16 [22][23][24].…”

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

“…In addition, as a result of a long-term operation test, various investigations into the operational conditions meeting both fouling control and reduction of associated required power proved that the combination of the ultrafiltration (UF) membrane and chemical treatment enables stable operation. The SWRO-PRO system flow is shown in Figure 15 [22][23][24].…”

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

See 2 more Smart Citations

SWRO-PRO System in “Mega-ton Water System” for Energy Reduction and Low Environmental Impact

Kurihara

Takeuchi

2018

Water

View full text Add to dashboard Cite

Reverse osmosis (RO) membranes have been widely applied in seawater desalination (SWRO) and wastewater reclamation as the main desalination technology since 2000. SWRO plants face challenges to reduce energy consumption and brine disposal to lessen marine pollution. To tackle these challenges, a SWRO-PRO (Pressure Retarded Osmosis) System was proposed in the "Mega-ton Water System" project under the Japanese national project of the "Funding Program for World-Leading Innovative R&D on Science and Technology" (FIRST Program). To reduce the energy consumption of the main SWRO plant, an innovative low-pressure SWRO membrane and a next generation energy recovery device (ERD) were developed by the "Mega-ton Water System" project. In addition to this research and development, a new membrane process has been proposed and confirmed as a low-pressure multi-stage SWRO (LMS). A brine conversion two-stage SWRO system was invented 20 years ago, and has been in operation for over 15 years. Application of the SWRO membrane process to actual commercial plants was an important research theme. The low-pressure multi-stage SWRO System (LMS) was an innovative method of introducing a low-pressure membrane and the membrane element in the pressure vessel was designed to avoid heavy fouling of lead elements. As a result of these developments at mega-ton scale SWRO plants, a 20% energy reduction was possible in the SWRO system of the "Mega-ton Water System". In the development of the PRO process, a PRO hollow fiber membrane module with a maximum 13.3 w/m 2 of membrane power density using a 10-inch module was established at a prototype PRO plant. Thus, a 30% energy reduction was possible using the SWRO-PRO System in the "Mega-ton Water System" at mega-ton scale SWRO plants. The brine disposal problem was also solved by this system.

show abstract

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

Section: Swro-pro System Of "Mega-ton Water System"mentioning

confidence: 99%

See 1 more Smart Citation

SWRO-PRO System in “Mega-ton Water System” for Energy Reduction and Low Environmental Impact

Kurihara

Takeuchi

2018

Water

View full text Add to dashboard Cite

show abstract

“…These salinity values account for the concentration polarization as shown in Eqs. (26) and (27), respectively [49]:…”

Section: Pressure-retarded Osmosismentioning

confidence: 99%

“…Some researchers have studied coupling PRO to a desalination system [26,27], but their analyses were limited to the salinity range of seawater reverse osmosis (SWRO) (brine salinity of about 70 g/kg). Prante et al [28] considered a wide range of salinities, but their PRO model was set up in parallel flow configuration, which is always less efficient than the counterflow configuration [29], and the analysis used an average flux, which results in an inaccurate representation of the variations actually found in a module-scale system.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of brine management methods: Zero-discharge desalination and salinity-gradient power production

et al. 2017

View full text Add to dashboard Cite

Growing desalination capacity worldwide has made management of discharge brines an increasingly urgent environmental challenge. An important step in understanding how to choose between different brine management processes is to study the energetics of these processes. In this paper, we analyze two different ways of managing highly saline brines. The first method is complete separation with production of salts (i.e., zero-discharge desalination or ZDD). Thermodynamic limits of the ZDD process were calculated. This result was applied to the state-of-the-art industrial ZDD process to quantify how close these systems are to the thermodynamic limit, and to compare the energy consumption of the brine concentration step to the crystallization step. We conclude that the brine concentration step has more potential for improvement compared to the crystallization step. The second brine management method considered is salinity-gradient power generation through pressure-retarded osmosis (PRO), which utilizes the brine's high concentration to produce useful work while reducing its concentration by mixing the brine with a lower salinity stream in a controlled manner. We model the PRO system coupled with a desalination system using a detailed numerical optimization, which resulted in about 0.42 kWh/m 3 of energy saving.

show abstract

Pressure‐Retarded Osmosis

Childress¹,

Achilli²

2013

Encyclopedia of Membrane Science and Technology

View full text Add to dashboard Cite

There is a natural tendency for salt solutions to be diluted by freshwater. This natural force appears as osmotic pressure. One process of capturing the energy released from the mixing of freshwater with saltwater is pressure‐retarded osmosis (PRO). In PRO, water from a low salinity solution permeates through a membrane into a pressurized, high salinity solution; effectively transforming water chemical potential into hydraulic head (i.e., potential energy). The combination of increased interest in renewable and sustainable sources of power production and the recent progress in membrane science has led to a spike in PRO interest in the past decade. This interest culminated in the first experimental “river‐to‐sea” PRO installation, which opened in Norway in 2009. Additional applications of PRO, including reverse osmosis (RO)–PRO systems and osmotic heat engines have since gained attention. Although river‐to‐sea PRO has the potential to be a reliable source of base‐load power, the higher salinity gradient available for power production in RO–PRO systems is likely to make them a more promising component of an alternative energy portfolio. While RO–PRO systems are in the early stages of development, the possibility of PRO to enable significant energy reductions in RO energy costs are driving interest in these systems. For all applications, development of optimized and inexpensive PRO membranes is necessary. This article will provide the theoretical foundation of the PRO process as well as the state of the art of the membranes used in this process. It will also outline the development of the river‐to‐sea PRO, RO–PRO, and osmotic heat engine systems and discuss their capabilities, limitations, and future as alternative energy sources.

show abstract

Power generation with salinity gradient by pressure retarded osmosis using concentrated brine from SWRO system and treated sewage as pure water

Cited by 171 publications

References 11 publications

SWRO-PRO System in “Mega-ton Water System” for Energy Reduction and Low Environmental Impact

SWRO-PRO System in “Mega-ton Water System” for Energy Reduction and Low Environmental Impact

Thermodynamic analysis of brine management methods: Zero-discharge desalination and salinity-gradient power production

Pressure‐Retarded Osmosis

Contact Info

Product

Resources

About