Abstract: A method for treating wastewater treats wastewater. In an embodiment, the method for treating wastewater includes treating wastewater comprising a chemical oxygen demand. The method includes dissolving an iron compound in the wastewater. The method also includes adjusting the pH of the wastewater to reduce the chemical oxygen demand of the wastewater.

Abstract: A method and system remove hydrogen sulfide from a hydrocarbon containing fluid. In an embodiment, the method for removing hydrogen sulfide from a hydrocarbon containing fluid includes contacting a methylmorpholine-N-oxide solution with the hydrocarbon containing fluid. The method also includes allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide to remove the hydrogen sulfide.

Abstract: A method for decontaminating a liquid having sulfides includes preparing a stabilized sodium percarbonate solution. In an embodiment, the method includes decontaminating a liquid. The liquid comprises reactive sulfides. The method also includes preparing a stabilized sodium percarbonate solution, which includes adding sodium percarbonate to a liquid solution. The liquid solution comprises a peroxide stabilizer and an acid. The method further includes dosing the liquid into the stabilized sodium percarbonate solution to decontaminate the liquid by oxidizing at least a portion of the reactive sulfides.

Abstract: A system and method treat oilfield produced water by two-stages of hazardous sulfide treatments. In an embodiment, a two-stage oil and gas field produced water treatment system includes an oil removal vessel. The oilfield produced water is introduced to the oil removal vessel. The oil removal vessel removes a portion of the hydrocarbons from the oilfield produced water to provide a reduced oil produced water. In addition, the system includes an iron sponge. The reduced oil produced water is introduced to the iron sponge, and the iron sponge removes a portion of the hazardous sulfides from the reduced oil produced water to provide a reduced sulfide produced water. The system also includes a stabilized sodium percarbonate solution. The stabilized sodium percarbonate solution is mixed with the reduced sulfide produced water to remove a portion of the hazardous sulfides from the reduced sulfide produced water to provide a treated produced water.

Abstract: A method for treating wastewater treats wastewater. In an embodiment, the method for treating wastewater includes treating wastewater comprising a chemical oxygen demand. The method includes dissolving an iron compound in the wastewater. The method also includes adjusting the pH of the wastewater to reduce the chemical oxygen demand of the wastewater.

Abstract: A method for treating compounds which contain reactive sulfur is disclosed, wherein the treatment produces compounds which contain sulfur in a non reactive form. The method is based on the use of an oxidizing compound selected from the group consisting of water soluble inorganic persulfates, water soluble inorganic and organic adducts of hydrogen peroxide and mixtures thereof. The method is particularly useful in preventing stress corrosion cracking of stainless steel and in preventing auto-ignition of pyrophoric iron sulfide.

Abstract: This application discloses a composition for and a method of using the composition to disperse hydrocarbon based components into a liquid carrier. The composition is comprised of a lower alkyl ester of a fixed oil, such as a modified vegetable oil, in combination with at least one other compound which enhances the ability of the ester to form an aqueous emulsion which can separate and which can alter the wetting character of the ester. The method comprises contacting a material comprised of hydrocarbon based components with an effective amount of composition for a time and a temperature sufficient to disperse the material into a liquid carrier.

Abstract: An aqueous composition containing an amine oxide surfactant, and preferably containing an amine oxide surfactant and enzymes, is added to crude oil, preferably by injecting the composition into the oil well, or adding the composition to pipelines or tankage containing the oil. An acid can also be used in conjunction with the composition. The composition acts to remove hydrocarbon contamination, from the well bore and mechanical components and further serves to break up the oil/water/sludge emulsion being delivered from the well head to facilitate separation of the oil. When used with an acid, the composition increases the effectiveness of the acid in removing inorganic contamination.

Abstract: A method of cleaning contaminated industrial equipment. An aqueous solution containing an enzyme and a surfactant having the formula: ##STR1## where n is 6-20, is agitated in contact with the equipment to remove oil contamination and provide a water/oil dispersion. The water/oil dispersion is then permitted to stand in a quiescent state to form an oil phase separate from the water phase, and the oil phase is then separated from the water phase.

Abstract: A pressurized closed flow cleaning system for cleaning the interior surface of industrial processing equipment. The system includes a pressure vessel containing an aqueous cleaning solution including the combination of enzymes and a surfactant. A supply conduit connects the pressure vessel with equipment to be cleaned and serves to supply the cleaning solution to the equipment, while a return conduit connects the equipment to the pressure vessel and acts to return the cleaning solution to the pressure vessel, thus providing a closed flow system. The solution is circulated through the closed flow system by a pump located in the supply conduit and the aqueous solution is heated to a temperature, preferably in the range of about 220.degree. F. to 260.degree. F., by a heat exchanger which is located downstream of the pump. Flow of the heated cleaning solution through the equipment to be cleaned will remove oil and solid contaminants.