scholarly journals A Small RO and MCDI Coupled Seawater Desalination Plant and Its Performance Simulation Analysis and Optimization

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 944 ◽  
Author(s):  
Shouguang Yao ◽  
Mengting Ji
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Water Pressure ◽  
Specific Energy Consumption ◽  
Feed Water ◽  
Seawater Desalination ◽  
One Stage ◽  
Coupling System ◽  
Parameter Matching ◽  
The One

To solve the problems of high specific energy consumption and excessive harmful ions in the water production of a small reverse osmosis (RO) plant, a desalination system coupling RO and membrane capacitive deionization (MCDI) is proposed in this study. Aiming at producing two cubic meters per day of fresh water with a salt concentration of less than 280 mg L−1, parameter matching optimization was carried out on two desalination system schemes of one-stage two-section RO and one-stage three-section RO coupled with MCDI. The results were compared with the parameter matching optimization results of the one-stage one-section RO and the one-stage two-section pure RO desalination system. The results show that compared with the pure RO desalination mode, the seawater desalination mode coupled with RO and MCDI reduces the specific energy consumption under the same effluent salt concentration. Moreover, it decreases the feed water pressure in front of the RO membrane, which can reduce the standard of high-pressure pump in a small seawater desalination plant. The energy consumption of the one-stage three-section RO and MCDI coupling system is lower than that of the one- stage two-section RO and MCDI coupling system, and the feed water pressure is also lower.

scholarly journals Evaluation of environmental indicators of RO seawater desalination: case study coastal strip of Hormozgan province, Iran

2020 ◽  
Vol 69 (7) ◽  
pp. 694-703
Author(s):  
Somayeh Mohammadi Jouzdani ◽  
Mohammad Mahdi Zerafat ◽  
Peyman Daneshkar Arasteh ◽  
Hassan Vagharfard
Keyword(s):  
Energy Consumption ◽  
Water Supply ◽  
Environmental Sustainability ◽  
Supply And Demand ◽  
Specific Energy Consumption ◽  
Water Shortage ◽  
Environmental Indicators ◽  
Water Withdrawal ◽  
Feed Water ◽  
Seawater Desalination

Abstract In recent years, desalination has been turned into a fresh water supply as a solution in some areas which suffer from water shortage. Desalinated water as an industrial product causes environmental problems. The objectives of this study are investigating environmental sustainability indicators related to seawater desalination via reverse osmosis (SWRO) on the coastline of Hormozgan province to provide a better insight for current and future water and energy demands related to this alternative. The selected indicators are specific energy consumption, seawater withdrawal, and brine volume in desalination, fuel consumption, carbon emission and water withdrawal in electric power generation. Using a solution-diffusion model, the direct indicator of energy consumption was obtained as used to calculate indirect indicators from the energy generation sector. Analysis of results indicates that desalination can lead to out-of-area side effects resulting from fuel type consumed and the practical power of the power plant, in addition to the regional environmental effects that are mostly affected by total dissolved solids of feed water. Based on the results, the environmental issues should be considered for the regions where desalination was planned as the most feasible alternative for water supply. This result can help policymakers to manage water supply and demand for sustainable development appropriately.

scholarly journals Energy efficiency of staged reverse osmosis (RO) and closed-circuit reverse osmosis (CCRO) desalination: a model-based comparison

2020 ◽  
Vol 20 (8) ◽  
pp. 3096-3106
Author(s):  
Simeng Li ◽  
Karla Duran ◽  
Saied Delagah ◽  
Joe Mouawad ◽  
Xudong Jia ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Reverse Osmosis ◽  
Specific Energy ◽  
Numerical Models ◽  
Specific Energy Consumption ◽  
Closed Circuit ◽  
Two Stage ◽  
One Stage ◽  
Multi Stage

Abstract Reverse osmosis (RO) technologies have been widely implemented around the world to address the rising severity of freshwater scarcity. As desalination capacity increases, reducing the energy consumption of the RO process per permeate volume (i.e., specific energy consumption) is of particular importance. In this study, numerical models are used to characterize and compare the energy efficiency of one-stage continuous RO, multi-stage continuous RO, and closed-circuit RO (CCRO) processes. The simulated results across a broad range of feed salinity (5,000–50,000 ppm, i.e., 5–50 g kg−1) and recovery (40%–95%) demonstrate that, compared with the most common one-stage continuous RO, two-stage and three-stage continuous RO can reduce the specific energy consumption by up to 40.9% and 53.6%, respectively, while one-stage and two-stage CCRO can lead to 45.0% and 67.5% reduction, respectively. The differences in energy efficiencies of various RO configurations are more salient when desalinating high-salinity feed at a high recovery ratio. From the standpoints of energy saving and capital cost, the simulated results indicate that multi-stage CCRO is an optimal desalination process with great potential for practical implementation.

Design and Development of Instrumentation and Data Acquisition for a Photovoltaic Driven Community Scale RO Desalination System and its Performance Studies

2014 ◽  
Author(s):  
Naseer Ahmad ◽  
Anwar Khalil Sheikh ◽  
Mostafa Elshafie ◽  
Hussain Al-Qahtani
Keyword(s):  
Energy Consumption ◽  
Data Acquisition ◽  
Flow Rate ◽  
Specific Energy ◽  
Water Flow Rate ◽  
Specific Energy Consumption ◽  
Feed Water ◽  
Design And Development ◽  
Pv System ◽  
High Pressure Pump

This work is related to the design and development of instrumentation, data acquisition and graphical user interface of Photovoltaic driven Reverse Osmosis system for monitoring and performance evaluation purposes. Installed PV system comprises of 12 PV panels, trackers, batteries and inverter whereas RO system is equipped with pre filters, pumps, energy recovery devices and filtration membranes. Proper instrumentation is carried out in PV system to measure the irradiation, temperatures, voltage and current at various points. Moreover various sensors are used to measure the pressures, flows, salinities at RO unit. Signal conditioning circuits are designed to adjust sensor output signals for computer interface. A simple moving average filter is used to suppress the measurement noise. The experimental investigation of PVRO system is carried out by using LabVIEW interface capabilities. The developed system reveals and stores the pronounced impact of measured variables on the PV output power and specific energy consumption of the RO filtration system. The online data display in multi-scale window frame is very informative for system operation and analysis. During the experimental run of PVRO system using the developed DAQ system, the PV system generated 7.5kWh of energy during the whole day operation. Feed water having 7100ppm salinity and its flow rate was set to 850 lit/hour by adjusting the RPM of the high pressure pump. Clean water flow rate is recorded to be at 465 lit/hour having salinity of 115 ppm during the RO operation. Specific energy consumption of RO system comes out to be 2.083kWh/m3 for 7100ppm salinity of feed water.

Determination of grinding parameters of fenugreek seed

1970 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
S Balasubramanian ◽  
Rajkumar Rajkumar ◽  
K K Singh
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Moisture Content ◽  
Specific Energy ◽  
Feed Rate ◽  
Average Particle Size ◽  
Specific Energy Consumption ◽  
Average Particle ◽  
Fenugreek Seeds ◽  
Fenugreek Seed

Experiment to identify ambient grinding conditions and energy consumed was conducted for fenugreek. Fenugreek seeds at three moisture content (5.1%, 11.5% and 17.3%, d.b.) were ground using a micro pulverizer hammer mill with different grinding screen openings (0.5, 1.0 and 1.5 mm) and feed rate (8, 16 and 24 kg h-1) at 3000 rpm. Physical properties of fenugreek seeds were also determined. Specific energy consumptions were found to decrease from 204.67 to 23.09 kJ kg-1 for increasing levels of feed rate and grinder screen openings. On the other hand specific energy consumption increased with increasing moisture content. The highest specific energy consumption was recorded for 17.3% moisture content and 8 kg h-1 feed rate with 0.5 mm screen opening. Average particle size decreased from 1.06 to 0.39 mm with increase of moisture content and grinder screen opening. It has been observed that the average particle size was minimum at 0.5 mm screen opening and 8 kg h-1 feed rate at lower moisture content. Bond’s work index and Kick’s constant were found to increase from 8.97 to 950.92 kWh kg-1 and 0.932 to 78.851 kWh kg-1 with the increase of moisture content, feed rate and grinder screen opening, respectively. Size reduction ratio and grinding effectiveness of fenugreek seed were found to decrease from 4.11 to 1.61 and 0.0118 to 0.0018 with the increase of moisture content, feed rate and grinder screen opening, respectively. The loose and compact bulk densities varied from 219.2 to 719.4 kg m-3 and 137.3 to 736.2 kg m-3, respectively.  

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