Techniques and systems for neutralizing discharge waters from ballast and/or cooling water biocidal treatment and disinfection systems are provided. The systems utilize, inter alia, oxidation reduction potential control to regulate the dechlorination of an electrocatalytically generated biocidal agent to allowable discharge levels in ship buoyancy systems and ship cooling water systems

An electrolyzed water generation device is provided with a first flow passage delivering electrolyzed water generated in one of a first polar chamber and a second polar chamber of an electrolytic chamber, a second flow passage delivering electrolyzed water generated in the other one of the first polar chamber and the second polar chamber, a double autochange crossline valve in which a flow rate regulating valve 74 and a flow passage switching valve 85 are interlocked, a polarity switching unit 51 switching the polarities of a first power feeder 41 and a second power feeder 42, a current detection unit 44 detecting a current to be supplied to the first power feeder 41 and the second power feeder 42, a storage unit 55 storing a switching interval for the polarity switching unit 51 and the flow passage switching valve 85, and a switching control unit 52 switching the polarity and the flow passage switching valve 85 based on the switching timing. The switching control unit 52 changes the switching interval stored in the storage portion 55 based on an integrated value of currents after switching the polarity.

Techniques and systems for neutralizing discharge waters from ballast and/or cooling water biocidal treatment and disinfection systems are provided. The systems utilize, inter alia, oxidation reduction potential control to regulate the dechlorination of an electrocatalytically generated biocidal agent to allowable discharge levels in ship buoyancy systems and ship cooling water systems

The present invention discloses an electrocatalytic Fenton oxidation-electrochemical oxidation coupling process and apparatus for efficient treatment of chemical wastewater, and belongs to the field of sewage treatment. The process includes an electrocatalytic Fenton oxidation step, an electrochemical oxidation step, and a pH adjustment step. A spacing between a cathode and an anode in the electrocatalytic Fenton oxidation step is controlled, so that oxygen produced at the anode reacts at the cathode to produce H.sub.2O.sub.2. The treatment requirements can be met without external aeration or external addition of H.sub.2O.sub.2, and meanwhile, the efficiency of COD removal by electro-Fenton oxidation is effectively improved. Further, by connecting a pH adjusting tank with the electrocatalytic Fenton oxidation-electrochemical oxidation coupling apparatus in series, a coupling treatment process with near-zero production of iron sludge is realized.

Disclosed is a device for efficiently recycling nickel from wastewater and a method. The device includes a housing, and an extraction unit and an electro-deposition unit which are respectively arranged inside the housing. The device is reasonable in overall structural design. An oscillating and floating component and a rotating component in an extraction cavity are used to fully and uniformly mix a solution to maximize the extraction strength. A mixing component in an electro-deposition cavity is used to accelerate ion dispersion, to better recycle nickel. The device is easy to operate, low in cost and suitable for mass promotion.

Systems and methods for controlling desalting and dehydration of crude oil, one method including monitoring total dissolved solids (TDS) content at an outlet stream from a crude oil separation unit, the outlet stream comprising water; monitoring basic sediment and water (BS&W) content at an outlet stream from the crude oil separation unit, the outlet stream comprising processed crude oil; determining pounds per thousand barrels (PTB) salt content and volumetric water content of a dried, desalted crude oil product stream using the TDS content and BS&W content; and controlling a process input to the method from a comparison between the PTB salt content and volumetric water content of the dried, desalted crude oil product stream versus a maximum set value for PTB salt content and volumetric water content of the dried, desalted crude oil product stream.

A method and system for the remediation of the water of an aquatic facility using an integrated process control system to control a mixed halogen-based treatment including chlorine dioxide and a free halogen. The integrated process control system provides versatile control the chlorine dioxide concentration using accelerated side-stream generation of chlorine dioxide. The remediation can occur continuously, and/or intermittently using a daily remediation cycle or a rapid recovery shock.

A gas diffusion electrode includes a carbon fiber tube, a support layer, and a catalyst layer. The carbon fiber tube is straight and functions as a substrate. The support layer includes a carbon black-polytetrafluoroethylene (PTFE) coating, and is disposed on the substrate. The catalyst layer includes carbon black, anhydrous ethanol, and PTFE, and is disposed on the support layer. The gas diffusion electrode has a diameter of 3-20 mm and a length of 50-500 mm.

A chlorinator system includes a swimming pool chlorinator configured to perform chlorination operations of a salt water pool system. The swimming pool chlorinator includes an electrolysis cell configured to receive a flow of pool water and to electrolyze sodium chloride in the pool water to generate chlorine and control electronics configured to control operations of the swimming pool chlorinator. Additionally, the chlorinator system includes a power source coupler configured to receive alternating current power from an alternating current power source. Further, the chlorinator system includes a synchronous rectifier configured to convert the alternating current power to generate a direct current power source to provide power to the swimming pool chlorinator.

Systems and methods for electrolytic spa sanitation are provided which control electrodes in a manner that extends the use of electrodes, reducing the frequency of replacement of electrodes. The system also incorporates electrodes that can be easily replaced by a user, further reducing the need to maintenance by trained service personnel. Systems and methods use measurements from ORP, pH, and temperature sensors to determine the amount of sanitizer necessary to be produced from the electrodes. The electrodes are capable or acting as either an anode or a cathode.