scholarly journals Simultaneous Desalination of Sea water and Electricity Production with New Membrane Technology, Air-Cathode Microbial Desalination Cells

2015 ◽  
Vol 10 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Mahdi Asadi-Ghalhari ◽  
Nasser Mehrdadi ◽  
Gholamreza Nabi-Bidhendi
Keyword(s):  
Electrical Conductivity ◽  
Sea Water ◽  
Low Energy ◽  
Electricity Production ◽  
Synthetic Wastewater ◽  
Air Cathode ◽  
Middle Chamber ◽  
Microbial Desalination Cell ◽  
Voltage Generation ◽  
Maximum Voltage

Water and energy shortages, has increased the need for methods that can provide low energy for desalination of sea water. Microbial desalination cell is one of the most important of these methods. In this study we use air cathode MDC for desalination of seawater. The maximum voltage, power and current density was 607mV, 521mW/m2 and 858mA/m2 (25mM PBS) and 701mV, 695mW/m2 and 992mA/m2 (50mM PBS) respectively. During the period of the voltage generation in 50mM PBS was about 1.5 times of 25mM PBS. Under this situation, EC of seawater with initial electrical conductivity declined by 48.31±3% (25mM PBS) and 46.71±2.73% (50mM PBS). As well as decrease of salt from sea water in the middle chamber, EC in synthetic wastewater and catholyte slightly increased. So that Change percent of EC in synthetic wastewater was 44.20 ± 11.94(25mM PBS) and 27.94 ± 3 (50 mM PBS) and in catholyte was 211.66 ± 22.41(25mM PBS) and 119.24 ± 11.25 (50 mM PBS) respectively. These results show that the MDC can also be used as a pretreatment to reverse osmosis; simultaneously the energy required in this process is also partly meet.

scholarly journals An investigation on using MDCs for an efficient desalination process as pretreatment of reverse osmosis

2020 ◽  
Vol 69 (4) ◽  
pp. 322-331
Author(s):  
Avin Habibi ◽  
Madjid Abbaspour ◽  
Amir H. Javid ◽  
Amir H. Hassani
Keyword(s):  
Reverse Osmosis ◽  
Oxygen Demand ◽  
Electrical Energy ◽  
Synthetic Wastewater ◽  
Electrochemical Technique ◽  
Continuous Mode ◽  
Fed Batch ◽  
Nacl Concentration ◽  
Middle Chamber ◽  
Microbial Desalination Cell

Abstract Microbial desalination cell (MDC) is a new bio-electrochemical technique which converts chemical energy into electrical energy, and at the same time desalinates water and treats wastewater. In this study, MDC performance and water biofouling conditions were tested as an efficient pretreatment desalination process of reverse osmosis (RO). The experiments were designed in a three-chamber reactor to compare the performance of batch and continuous fed modes, using bio-cathode and synthetic wastewater in four different hydraulic retention times and 17 and 35 g/L NaCl concentrations. According to the results, maximum salt removal of about 52.3% was obtained in the continuously fed MDC at 35 g/L NaCl concentration. The maximum salt removal at 17 g/L NaCl was also observed in continuous mode. The anolyte pH in both batch and continuous modes dropped from 7 to 6.32, 6.47 and 6.37, 6.48 in 17 and 35 g/L NaCl concentrations respectively. The chemical oxygen demand (COD) removal values in the continuous mode were 61 and 65% in the anolyte and catholyte respectively, higher than those of fed-batch MDC. The biofouling of the middle chamber solution was confirmed by conducting bio-microbial tests. Our results suggest that the type of hydraulic flow can improve the performance of MDC in different concentrations of NaCl.

scholarly journals Proof of concept of wastewater treatment via passive aeration SND using a novel zeolite amended biofilm reactor

2018 ◽  
Vol 78 (10) ◽  
pp. 2204-2213 ◽  
Author(s):  
Liang Cheng ◽  
Raphael Marie-Guillaume Flavigny ◽  
Md Iqbal Hossain ◽  
Wipa Charles ◽  
Ralf Cord-Ruwisch
Keyword(s):  
Oxygen Supply ◽  
Energy Requirement ◽  
Operation Mode ◽  
High Energy ◽  
Biofilm Reactor ◽  
Low Energy ◽  
Treated Wastewater ◽  
Synthetic Wastewater ◽  
Bulk Solution ◽  
Nutrient Removal Efficiency

Abstract The current paper describes a novel passive aeration simultaneous nitrification and denitrification (PASND) zeolite amended biofilm reactor that removes organic carbon and nitrogen from wastewater with low-energy consumption. Next to the ammonium oxidizing bacteria (AOB), this reactor contained naturally enriched glycogen accumulating organisms (GAOs) and zeolite powder to initially adsorb BOD (acetate) and ammonium (NH4+-N) from synthetic wastewater under anaerobic conditions. Draining of the treated wastewater exposed the biofilm directly to air enabling low-energy oxygen supply by passive aeration. This allowed the adsorbed ammonium to be oxidized by the AOB and the produced nitrite and nitrate to be reduced simultaneously by the GAOs using the adsorbed BOD (stored as PHAs) as carbon source. Overall, with an operation mode of 1 h anaerobic and 4 h aerobic phase, the nutrient removal efficiency after single treatment was about 94.3% for BOD and 72.2% for nitrogen (NH4+-N). As high-energy aeration of the bulk solution for oxygen supply is completely avoided, the energy requirement of the proposed PASND biofilm reactor can be theoretically cut down to more than 50% compared to the traditional activated sludge process.

Treatment of seafood industrial wastewater coupled with electricity production using air cathode microbial fuel cell under saline condition

2020 ◽  
Vol 44 (15) ◽  
pp. 12535-12545
Author(s):  
Arulazhagan Pugazhendi ◽  
Afnan Eid Al‐Mutairi ◽  
Mamdoh T. Jamal ◽  
Rajesh Banu Jeyakumar ◽  
Kowsalya Palanisamy
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Industrial Wastewater ◽  
Electricity Production ◽  
Saline Condition ◽  
Air Cathode

Ligand mixed-valence and electrical conductivity in coordination complexes containing a redox-active phenalenol-substituted ligand

2019 ◽  
Vol 48 (23) ◽  
pp. 8053-8056 ◽  
Author(s):  
Sarah Dale ◽  
Nico M. Bonanno ◽  
Mark Pelaccia ◽  
Alan J. Lough ◽  
Atsuhiro Miyawaki ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Mixed Valence ◽  
Closed Shell ◽  
Coordination Complexes ◽  
Low Energy ◽  
Redox Active

Neutral Fe3+ and Co3+ complexes are reported featuring mixed-valent open- and closed-shell ligands, low energy IVCT bands and electrical conductivity.

scholarly journals New Combined Solution to Harness Wave Energy—Full Renewable Potential for Sustainable Electricity and Fresh Water Production

Proceedings ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 10
Author(s):  
Michael Henriksen ◽  
Simon Davide Luigi Piccioni ◽  
Massimo Lai
Keyword(s):  
Fresh Water ◽  
Wave Energy ◽  
Sea Water ◽  
Real Life ◽  
Water Desalination ◽  
Electricity Production ◽  
Combined Solution ◽  
Sustainable Electricity ◽  
Technology Solution ◽  
Roll Out

This paper is a first general dissemination of the H2020 Project Wave to Energy and Water (W2EW) started in January 2019. The joint vision of the W2EW consortium (Wavepiston, Ener.Med, Fiellberg, Vryhof) is to deliver a world-beating wave powered technology solution for electricity production and desalination. It relies on the innovative integration of wave energy and sea water desalination technologies, to produce zero-emission electricity and fresh water, with dynamic optimization of energy production and maximizing the available wave energy using fresh water as storage. The W2EW solution enables competitive cost of electricity and water. The present project is critical to demonstrate the W2EW solution in a real-life environment, to reduce the risk profile of the solution and to build the market to pave the way for broad market roll-out. The scope of the paper is to introduce the project W2EW and its expected results to a broader audience.

Modification of electrical conductivity in RF magnetron sputtered ZnO films by low-energy hydrogen ion implantation

2006 ◽  
Vol 6 (3) ◽  
pp. 495-498 ◽  
Author(s):  
J. Kennedy ◽  
A. Markwitz ◽  
Z. Li ◽  
W. Gao ◽  
C. Kendrick ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ion Implantation ◽  
Low Energy ◽  
Hydrogen Ion ◽  
Zno Films ◽  
Hydrogen Ion Implantation

SHORELINE CLEANSING BY INTERACTIONS BETWEEN OIL AND FINE MINERAL PARTICLES

1995 ◽  
Vol 1995 (1) ◽  
pp. 219-227 ◽  
Author(s):  
James R. Bragg ◽  
Edward H. Owens
Keyword(s):  
Potential Role ◽  
Sea Water ◽  
Field Studies ◽  
Low Energy ◽  
Oil Removal ◽  
Oil Droplets ◽  
Mineral Particles ◽  
Treatment Techniques ◽  
Oil In Water ◽  
Flocculation Process

ABSTRACT Interactions of fine mineral particles with oil stranded on shorelines following spills has been shown to be an important natural cleansing process, capable of accelerating oil removal in most environments, and particularly in low energy environments where wave action and abrasion are negligible. This process involves formation of solids-stabilized oil-in-water emulsions by flocculation of micron-sized mineral fines with oil droplets in the presence of water containing ions (such as sea water). Once flocculated, the oil droplets do not coalesce, and the oil no longer adheres strongly to shoreline sediments, facilitating its removal and dispersion by waves and tidal currents. The importance of the flocculation process to the rate of oil removal from sediments, the conditions needed for the process to occur, and the properties of the resulting floe have been studied in detail for the Exxon Valdez spill. Its potential role in shoreline cleansing also has been studied for other recent spills: Metula (1974, Chile), Arrow (1970, Nova Scotia), BIOS test spill (1981, Cape Hatt, Northwest Territories), Nosac Forest (1993, Tacoma, Washington), and Fred Bouchard (1993, Tampa, Florida). This paper summarizes the various laboratory and field studies and discusses the findings within the contexts of natural shoreline cleansing, and the use of certain treatment techniques.

Sign in / Sign up

Export Citation Format

Share Document