The near-future integration of microbial desalination cells with reverse osmosis technology

2014 ◽  
Vol 7 (12) ◽  
pp. 3921-3933 ◽  
Author(s):  
Ahmed ElMekawy ◽  
Hanaa M. Hegab ◽  
Deepak Pant
Keyword(s):  
Energy Consumption ◽  
Reverse Osmosis ◽  
Fresh Water ◽  
Water Shortage ◽  
Water Desalination ◽  
Energy Depletion ◽  
Negative Effect ◽  
Near Future

The combined negative effect of both fresh water shortage and energy depletion has encouraged the research to move forward to explore effective solutions for water desalination with less energy consumption.

scholarly journals Continuous Cycle of Water Desalination Utilizing Hydrogel as Draw Agent.

2021 ◽  
Author(s):  
Alexander Fayer
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Low Power ◽  
Reverse Osmosis ◽  
Fresh Water ◽  
Duty Cycle ◽  
Water Desalination ◽  
Low Power Consumption ◽  
Seawater Desalination ◽  
Specific System

This document discusses operation of desalination system permanently extracting water from hydrogel draw agent by specially selected wicks. Due to its peculiarity the system combines advantages of both forward and reverse osmosis approaches such as, low power consumption, passive process of a freshwater extraction, continuous duty cycle and scaling possibility. While in modern systems an energy consumption of seawater desalination reaches of about 3 kWh/m 3, including pre-filtering and ancillaries [1], the same parameter for the specific system expected to be as low as for local fresh water supplyi.e., 0.2 kWh/m 3

Design Optimization of a Solar-Powered Reverse Osmosis Desalination System for Small Communities

2013 ◽  
Author(s):  
Jihun Kim ◽  
Karim Hamza ◽  
Mohamed El Morsi ◽  
Ashraf O. Nassef ◽  
Sayed Metwalli ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Fresh Water ◽  
Energy Resource ◽  
Production Capacity ◽  
Water Desalination ◽  
Battery Storage ◽  
Water Stream ◽  
Permeable Membrane ◽  
Small Communities ◽  
Solar Powered

Fresh water availability is essential for the economic development in small communities in remote areas. In desert climate, where naturally occurring fresh water is scarce, seawater or brackish water from wells is often more abundant. Since water desalination approaches are energy intensive, a strong motivation exists for the design of cost-effective desalination systems that utilize the abundant renewable energy resource; solar energy. This paper presents an optimization model of a solar-powered reverse osmosis (RO) desalination system. RO systems rely on pumping salty water at high pressure through semi-permeable membrane modules. Under sufficient pressure, water molecules will flow through the membranes, leaving salt ions behind, and are collected in a fresh water stream. Since RO system are primarily powered via electricity, the system model incorporates photovoltaic (PV) panels, and battery storage for smoothing out fluctuations in the PV power output, as well as allowing system operation for a number of hours after sunset. Design variables include sizing of the PV solar collectors, battery storage capacity, as well as the sizing of the RO system membrane module and power elements. The objective is to minimize the cost of unit volume produced fresh water, subject to constraints on production capacity. A genetic algorithm is used to generate and compare optimal designs for two different locations near the Red Sea and Sinai.

scholarly journals Analyzing the Energy Consumption, GHG Emission, and Cost of Seawater Desalination in China

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 463 ◽  
Author(s):  
Xuexiu Jia ◽  
Jiří Klemeš ◽  
Petar Varbanov ◽  
Sharifah Wan Alwi
Keyword(s):  
Energy Consumption ◽  
Water Supply ◽  
Reverse Osmosis ◽  
Process Integration ◽  
Ghg Emissions ◽  
Water Desalination ◽  
Heat Integration ◽  
Seawater Desalination ◽  
Ghg Emission ◽  
Product Cost

Seawater desalination is considered a technique with high water supply potential and has become an emerging alternative for freshwater supply in China. The increase of the capacity also increases energy consumption and greenhouse gases (GHG) emissions, which has not been well investigated in studies. This study has analyzed the current development of seawater desalination in China, including the capacity, distribution, processes, as well as the desalted water use. Energy consumption and GHG emissions of overall desalination in China, as well as for the provinces, are calculated covering the period of 2006–2016. The unit product cost of seawater desalination plants specifying processes is also estimated. The results showed that 1) The installed capacity maintained increased from 2006 to 2016, and reverse osmosis is the major process used for seawater desalination in China. 2) The energy consumption increased from 81 MWh/y to 1,561 MWh/y during the 11 years. The overall GHG emission increase from 85 Mt CO2eq/y to 1,628 Mt CO2eq/y. Tianjin had the largest GHG emissions, following are Hebei and Shandong, with emissions of 4.1 Mt CO2eq/y, 2.2 Mt CO2eq/y. and 1.0 Mt CO2eq/y. 3) The unit product cost of seawater desalination is higher than other water supply alternatives, and it differentiates the desalination processes. The average unit product cost of the reverse osmosis process is 0.96 USD and 2.5 USD for the multiple-effect distillation process. The potential for future works should specify different energy forms, e.g. heat and power. Alternatives of process integration should be investigated—e.g. efficiency of using the energy, heat integration, and renewables in water desalination, as well as the utilization of total site heat integration.

Design Optimization of Batteryless Photovoltaic-Powered Reverse Osmosis Water Desalination in Remote Areas

2014 ◽  
Author(s):  
Jihun Kim ◽  
Karim Hamza ◽  
Mohamed El-Morsi ◽  
Ashraf O. Nassef ◽  
Sayed Metwalli ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Fresh Water ◽  
Water Desalination ◽  
Operating Pressure ◽  
Battery Storage ◽  
Outer Loop ◽  
Loop Optimization ◽  
Remote Areas ◽  
Desalination Plant ◽  
Real Coded Genetic Algorithm

Reverse osmosis (RO) is one of the main technologies for water desalination, which can be used in locations with water resources that have high salinity content (such as saline ground water or seawater) to produce fresh water. Energy requirement for RO is less than other desalination processes, but is in the form of electric power, which can be scarce as fresh water in in remote areas not connected to the grid. Fortunately, many areas with fresh water shortage due to lack of rainfall have abundant sunshine. The combination of solar power and RO desalination is attractive, but remote areas usually requires small modular units, which favors photovoltaic (PV) solar energy harvesting. It is important to consider the net cost-effectiveness of the system when designing the PV-RO desalination plant. Adding battery storage to a PV-RO system has the advantage of steadier operation, but is an additional cost whose real benefit is only realized with a larger PV array that can harvest more energy during daytime. This paper compares the net unit cost of fresh water for realistic scenarios of PV-RO systems with and without battery storage. A multi-level optimization approach previously developed by the authors for time-variant power PV-RO systems is adopted; a “sub-loop” optimization determines the operating pressure and flow rate given a fixed system configuration and instantaneous power input, while an “outer loop” optimizes the configuration of the desalination plant. The sub-loop optimization is done via an enumeration approach, while the outer loop is optimized via a mixed real-coded genetic algorithm (GA). A demonstration study shows a batteryless system being approx. 30% more expensive per unit fresh water production than a fully optimized battery-backed system. However, most of the cost of a batteryless system is in initial investment, which with 7% less annual operating cost, can present a plausible design choice for remote areas.

scholarly journals Modeling of environmental aspects related to reverse osmosis desalination supply chain

2020 ◽  
Vol 7 (1) ◽  
pp. 31-40
Author(s):  
Mohammad Reza Mehrgan ◽  
Hannan Amoozad Mahdiraji ◽  
Shahab Binaee ◽  
Vali Alipour ◽  
Seyyed Hossein Razavi Haji Agha
Keyword(s):  
Power Plant ◽  
Reverse Osmosis ◽  
Cooling Water ◽  
Research Problem ◽  
Water Desalination ◽  
Production Flow ◽  
Negative Effect ◽  
Carbon Dioxide Co2 ◽  
Desalination Plants ◽  
Reverse Osmosis Desalination

Background: This study aimed to model optimization of strategic environmental management decisions in the operation of reverse osmosis desalination, emphasizing the costs required for the environmental protection during the production of freshwater using reverse osmosis technology. Methods: This analytical research was conducted in five cities of Hormozgan province in Iran for 18 months from February 2018 to September 2019. The research includes eight phases of defining the research problem, data collection, preliminary data analysis and decision criteria, mathematical modeling, model validation, information preparation, analysis and finally discussion, conclusions and suggestions. The main environmental issues were the carbon dioxide (CO2 ) release rate due to power demand and rejected brine water (RBW) were entered the mathematical model. Results: The desalination plants of Abu Musa, Bandar Abbas, Qeshm, Sirik, and Hormoz with water production flow rate of 2100, 89 000, 5300, 3300 and 1500 m3 /d can generate 2360.82, 100053.80, 5958.260, 3709.86 and 1686.30 tons/year of CO2 emissions respectively. This output requires 1.35, 57.47, 3.42, 2.13 and 0.97 million USD for controlling the process, respectively. For reduction of the negative effect of RBW 0.75, 22.79, 1.78, 1.15 and 0.55 million USD respectively, is needed. Conclusion: Recommendations for environmental impacts protection of RBW, for desalination capacity up to 50 000 m3 /d, are; (a) for desalination capacity up to 50 000 m3 /d; dilution the RBW using raw water before entering into the sea, (b) for capacity of 50 000-100 000 m3 /d; dispersing RBW in sea using diffuser, and (c) for capacity more than 100 000 m3 /d; hybrid water desalination plants and power plant. Application of power plant cooling water to dilute RBW may reduce cost.

Evaluation and minimisation of energy consumption in a medium-scale reverse osmosis brackish water desalination plant

2020 ◽  
Vol 248 ◽  
pp. 119220 ◽  
Author(s):  
Alanood A. Alsarayreh ◽  
M.A. Al-Obaidi ◽  
A.M. Al-Hroub ◽  
R. Patel ◽  
I.M. Mujtaba
Keyword(s):  
Energy Consumption ◽  
Reverse Osmosis ◽  
Brackish Water ◽  
Water Desalination ◽  
Medium Scale ◽  
Desalination Plant

scholarly journals Experimental versus theoretical study of reverse osmosis pilot scaling: The case of Algerian brackish water desalination

2019 ◽  
Vol 42 (1) ◽  
pp. 49-58
Author(s):  
Abderrezak Bouchareb ◽  
Mehdi Metaiche ◽  
Hakim Lounici
Keyword(s):  
Water Quality ◽  
Ground Water ◽  
Reverse Osmosis ◽  
Brackish Water ◽  
System Analysis ◽  
Sea Water ◽  
Rejection Rate ◽  
Water Shortage ◽  
Water Desalination ◽  
Ground Water Quality

Abstract In recent years, the increasing threat to ground water quality due to human activities has become a matter of great concern. The ground water quality problems present today are caused by contamination and by over exploitation or by combination of both. Reverse osmosis (RO) desalination is one of the main technologies for producing fresh water from sea water and brackish ground water. Algeria is one of the countries which suffer from the water shortage since many years, so desalination technology becomes inevitable solution to this matter. In this study, a comparison is provided of results of reverse osmosis desalination for three different qualities of brackish water from the central-east region of Algeria (Bouira and Setif Prefectures), wherein they cannot use it as human drinking or in irrigation systems. The main objective of our study is to establish a comparison of the reverse osmosis membrane TW30-2540 performances in the term of (permeate flow, recovery rate, permeate total dissolved solids – TDS and salts rejection) under different operation pressures (each one takes a time of 720 second for pilot scaling). In order to make an overview comparison between the experimental and the simulated results we used ROSA (Reverse Osmosis System Analysis) software. At the end of this study we noted that, the simulated results are lower than the pilot scaling values and the most removed salts are the sodium chlorides with 99.05% of rejection rate.

Studies on the Design of Reverse Osmosis Water Desalination Systems for Cost and Energy Efficiency

2010 ◽  
Author(s):  
Karim Hamza ◽  
Mohammed Shalaby ◽  
Ashraf O. Nassef ◽  
Mohamed F. Aly ◽  
Kazuhiro Saitou
Keyword(s):  
Optimal Design ◽  
Reverse Osmosis ◽  
Fresh Water ◽  
Unit Cost ◽  
Minimum Cost ◽  
Water Desalination ◽  
Salt Ions ◽  
Cost Of Energy ◽  
Flow Through ◽  
The Cost

This paper explores optimal design of reverse osmosis (RO) systems for water desalination. In these systems, salty water flows at high pressure through vessels containing semi-permeable membrane modules. The membranes can allow water to flow through, but prohibit the passage of salt ions. When the pressure is sufficiently high, water molecules will flow through the membranes leaving the salt ions behind, and are collected in a fresh water stream. Typical system design variables include the number and layout of the vessels and membrane modules, as well as the operating pressure and flow rate. This paper presents models for single and two-stage pressure vessel configurations. The models are used to explore the various design scenarios in order to minimize the cost and energy required per unit volume of produced fresh water. Multi-objective genetic algorithm (GA) is used to generate the Pareto-optimal design scenarios for the systems. Case studies are considered for four different water salinity concentration levels. Results of the studies indicate that even though the energy required to drive the RO system is a major contributor to the cost of fresh water production, there exists a tradeoff between minimum energy and minimum cost. An additional parametric study on the unit cost of energy is performed in order to explore future trends. The parametric study demonstrates how an increase in the unit cost of energy may shift the minimum cost designs to shift to more energy-efficient design scenarios.

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