An oil-containing wastewater treatment method and equipment with creating and saving energy efficiency are disclosed. The method comprises the following steps of: providing the oil wastewater having a first COD value; performing the acidized demulsification treatment to the oil wastewater to separate the oil wastewater into upper layer solution and lower layer solution; performing the first coagulation sedimentation treatment to the lower layer solution to form the precipitate and upper clear solution; and performing the contact aeration treatment step to the upper clear solution by using the biological agent. Therefore, the inflow solution having a second COD value that meets the inflow standard can be obtained.

A method for producing an additive for reclaiming oil from a fluid product stream and a treated silica with controlled hydrophobicity are disclosed. The method includes the steps of providing silica or silicate with a particle size of between 3.0 m to 20 m, the silica or silicates having an agglomerate size of between 10 m to 100 m and being chosen to achieve the desired particle-size range and with a controlled level of hydrophobicity; treating the silica or silicate with a silicone or silane to make it hydrophobic; and controlling the hydrophobicity of the silica or silicate by varying the temperature and treatment time of the silica or silicate, amount of a treating material used to treat the silica or silicate, and the molecular weight of the treating material. The additive improves oil extraction and concentration from a fluid product stream.

A produced water treatment system includes a skim oil unit, a particulate removal unit, a liquid/liquid separation unit, and a flash concentration unit including a burner for providing hot flue gas into a bath vessel. One or more tubes extending into the bath vessel may be fed hot flue gas by the burner and provide a path for the hot flue gas to flow into the bath vessel. The one or more tubes may include a distribution tube comprising a plurality of ports for hot flue gas to exit the flow path into the bath vessel. At least a portion of a flow path for hot flue gas generated by the burner may extend above a waterline of a bath vessel. Portions flanking the portion of the flow path extending above the waterline may be positioned below the waterline to be thereby submerged during operation. The skim oil unit may include a heated dissolved air floatation system. The heat may be provided by the flash concentration unit. The heat may flash VOCs and dissolved organics from the produced water in a floatation tank of the skim oil. The VOCs and dissolved organics may be provided to the burner for use a fuel and/or incineration.

Metals, such as mercury, may be removed from aqueous, hydrocarbon, or mixed oilfield or refinery fluids by: applying a sulfur compound having the general formula HS-X, wherein X is a heteroatom substituted alkyl, cycloalkyl, aryl, and/or alkylaryl group either alone or in combination with or as a blend with at least one demulsifier, a buffering agent, a pour point depressant, and/or a water clarifier to chelate the at least one metal and form a chelate complex of the sulfur compound with the at least one metal and then separating the chelate complex from the fluid.

The present invention includes a method of controlling an oil spill through introduction of a plurality of magnetizable particles into the oil spill in an amount sufficient to form a colloidal mixture. An absorbent is, also introduced into the oil spill to form an absorbent mixture. A magnetic field can be applied to the system to move, manipulate, or otherwise control the absorbent mixture in response to movement of the magnetic field.

The present invention provides improved methods for purifying and/or removing multiply charged cations and suspended solids from water. In particular the process relates to an additive composition that has the appropriate surfactant characteristics for effectively removing multiply charged cations and suspended solids from an aqueous or oil/aqueous mixed phase via foam fractionation. According to the invention, a hydrophobically modified polymer that acts as an associative thickener is used in the presence of a source of alkalinity or anionic reactant as well as surfactant in appropriate ratios to facilitate multiply charged cation and suspended solids removal for water purification in any of a number of commercial, environmental and industrial applications.

A method for the separation and removal of organic and inorganic contamination in fluids where water is the continuous phase and oil contamination is present in the continuous phase, is described. Xanthan and/or Guar in the unsolved state dispersed in nonpolar solvent of de-aromatized aliphatic or a synthetic isoparaffine, immiscible with water and miscible with oil, is dosed into the fluid.

Embodiments of the present invention are generally related to a system and method to remove hydrogen sulfide from sour water and sour oil. In particular, hydrogen sulfide is removed from sour water and sour oil without the need for special chemicals, such as catalyst chemicals, scavenger chemicals, hydrocarbon sources, or a large scale facility. The system and method in the present invention is particularly useful in exploratory oil and gas fields, where large facilities to remove hydrogen sulfide may be inaccessible. The present invention addresses the need for safe and cost effective transport of the deadly neurotoxin. Particular embodiments involve a system and method that can be executed both on a small and large scale to sweeten sour water and sour oil.

An apparatus for reducing emulsions in kitchen effluent discharging to a FOG removal apparatus includes a pre-rinse sink, a tank positioned below the pre-rinse sink to receive effluent from the pre-rinse sink, an outlet from the tank and leading to a pipe, a valve in the outlet having an open position and a closed position, a dishwasher having a drain connected to the pipe, and a control for the valve to be in its closed position when the dishwasher is discharging to the pipe.

A single-phase microemulsion additive may be introduced to a stream containing mixtures of or emulsions of oil and water in an effective amount to separate oil from the water in the stream and/or separating water from the oil in the stream. The single-phase microemulsion additive is formed by combining at least one demulsifier, at least one water clarifier, at least one surfactant, and optionally at least one solvent.