摘要:
In this disclosure, a process of recycling acid, base and the salt reagents required in the Li recovery process is introduced. A membrane electrolysis cell which incorporates an oxygen depolarized cathode is implemented to generate the required chemicals onsite. The system can utilize a portion of the salar brine or other lithium-containing brine or solid waste to generate hydrochloric or sulfuric acid, sodium hydroxide and carbonate salts. Simultaneous generation of acid and base allows for taking advantage of both chemicals during the conventional Li recovery from brines and mineral rocks. The desalinated water can also be used for the washing steps on the recovery process or returned into the evaporation ponds. The method also can be used for the direct conversion of lithium salts to the high value LiOH product. The method does not produce any solid effluent which makes it easy-to-adopt for use in existing industrial Li recovery plants.
摘要:
In this disclosure, a process of recycling acid, base and the salt reagents required in the Li recovery process is introduced. A membrane electrolysis cell which incorporates an oxygen depolarized cathode is implemented to generate the required chemicals onsite. The system can utilize a portion of the salar brine or other lithium-containing brine or solid waste to generate hydrochloric or sulfuric acid, sodium hydroxide and carbonate salts. Simultaneous generation of acid and base allows for taking advantage of both chemicals during the conventional Li recovery from brines and mineral rocks. The desalinated water can also be used for the washing steps on the recovery process or returned into the evaporation ponds. The method also can be used for the direct conversion of lithium salts to the high value LiOH product. The method does not produce any solid effluent which makes it easy-to-adopt for use in existing industrial Li recovery plants.
摘要:
Provided is a microbial fuel cell including a cathode and an anode, wherein the cathode includes a waterproof gas diffusion layer including a siloxane and a catalyst layer including a binder, wherein a surface of the gas diffusion layer opposite the catalyst layer contacts air, and the anode includes electrogenic bacteria. Also provided is a method for making a microbial fuel cell, including fabricating a cathode, wherein fabricating includes disposing a siloxane solution onto a surface of a substrate, wherein the siloxane solution includes a siloxane and a solvent, drying the siloxane solution to form a waterproof gas diffusion layer, and placing the gas diffusion layer on a catalyst layer including a binder, and facing an anode with the cathode whereby the gas diffusion layer faces away from the anode and contacts air.
摘要:
A ballast water electrolytic apparatus for treating ballast water comprising a ballast water electrolytic chamber and an oxygen supply chamber, the ballast water electrolytic chamber including an anode for producing chlorine oxides by electrolyzing ballast water and an oxygen cathode for separating the ballast water electrolytic chamber and the oxygen supply chamber and for producing water by reacting hydrogen ions in the ballast water electrolytic chamber with oxygen flowing into the oxygen supply chamber.
摘要:
A low-voltage, low-energy electrochemical system and method of removing protons and/or producing a base solution using a gas diffusion anode and a cathode electrolyte comprising dissolved carbon dioxide, while applying 2V or less across the anode and cathode.
摘要:
Provided herein are methods and systems for sequestering carbon dioxide from a multi-component gaseous stream, such as flue gas from natural gas-burning power plant to produce a protonated carbonate. Also provided herein are methods and systems for electrochemically producing proton-removing agents to form a deprotonated carbonate from the protonated carbonate. The electrochemical process may consume less energy than the amount of energy generated during production of the multi-component gaseous stream.
摘要:
A ballast water electrolytic apparatus for treating ballast water comprising a ballast water electrolytic chamber and an oxygen supply chamber, the ballast water electrolytic chamber including an anode for producing chlorine oxides by electrolyzing ballast water and an oxygen cathode for separating the ballast water electrolytic chamber and the oxygen supply chamber and for producing water by reacting hydrogen ions in the ballast water electrolytic chamber with oxygen flowing into the oxygen supply chamber.
摘要:
A reactor apparatus and method for removing chemical and biological contaminants from a contaminated fluid while minimizing disinfection by-products, sludges, and harmful residue. The reactor has a sequential, multi-stage, reaction vessel with an upper end region and a lower end region. The vessel has a liquid inlet port into which the contaminated fluid may pass. Treated liquid may exit the reactor through a liquid outlet port. A gas inlet port and a gas outlet port are provided. A plurality of stacked reaction chambers have a sieve tray and flange assembly, the sieve tray having holes up through which a gaseous phase may pass. A gas phase electrode, an electrical power supply capable of producing pulsed electrical discharges connected thereto, and a liquid phase electrode are provided. The electrodes create therebetween a pulsed corona discharge for generating reactive species in situ and destroying bacterial contaminants in the liquid. A weir-downcomer tube has an upper portion situated above a level of liquid in the associated chamber. The lower portion is situated below a level of liquid in a reaction chamber next below. The weir-downcomer tube minimizes or prevents back flow of liquid from a reaction chamber to an upstream reaction chamber.
摘要:
Electrochemical apparatus and methods that support periodic, non-steady state, or discontinuous operation without suffering degradation of materials or loss of efficiency. The invention provides a means for positioning one or more electrodes into contact with electrolyte and means for retracting the one or more electrodes out of contact with the electrolyte. The means for positioning and means for retracting may be the same device or different devices. The means for positioning and means for retracting may be designed to provide automatic, passive, or fail-safe retraction of the electrode upon a given shutdown condition, such as a voltage of less than one Volt being applied between the first and second electrodes, expiration of a time period, an ozone concentration greater than a setpoint ozone concentration, contact pressure of less than 5 psig, and combinations thereof.
摘要:
A photovoltaic driven electrolytic water desalination process is disclosed herein. The process utilizes electrical energy provided by a photovoltaic device, such as a triple junction amorphous silicon solar cell, to induce a water splitting reaction in brackish water. The photovoltaic device provides an electrical potential across an anode and a cathode in contact with the brackish water and the electrical potential induces the water splitting reaction. The water splitting reaction liberates oxygen gas and hydrogen gas from brackish water. Collection and subsequent recombination of the oxygen gas and hydrogen gas in a reaction chamber provides for the spontaneous formation of purer, non-brackish water. The recombination reaction of oxygen gas and hydrogen gas to form water is an exothermic process that liberates energy in the form of thermal energy and/or electrical energy. The energy produced may be provided as power to other processes or used to supplement the photovoltaic energy used in the water splitting reaction. In another embodiment, the hydrogen gas and oxygen gas formed from brackish water may be separately collected and utilized without recombination to form water. The instant invention thus provides a method for forming hydrogen gas from brackish water.