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.

The present invention is directed toward a bioremediation product, its method of manufacture and method of use. A blend of microorganisms, cleansers and surfactants is disclosed which is non-toxic and solvent free, and which has the ability to accelerate the breaking down process of oils, materials such as benzene, toluene, and xylene (BTEX); petroleum hydrocarbon fractions F1-F4 (as defined by CCME2000), polycyclic aromatic hydrocarbons (PAH), paraffin waxes, volatile organics, molds, and the like; while simultaneously providing a biological component which is effective to reduce the total petroleum hydrocarbon levels to zero at an accelerated rate. The product is useful for bioremediation and as an oil dispersant composition useful in treating oil spills, and for cleanup of the shoreline, animals, plants, and equipment.

A method of visualizing the cleaning performance of a cleaning composition is provided.

A method for biotreating persistent organic waste water containing a higher fatty acid and a thickening polysaccharide without adding chemicals includes subjecting waste water to an oil-water separating process to separate it into aerobically treatable oil-containing waste water and anaerobically treatable polysaccharide-containing waste water. The anaerobically treatable polysaccharide-containing waste water is subjected to a reducing process in an anaerobic treatment to convert the polysaccharide in the waste water into a monosaccharide and to obtain monosaccharide water capable of aerobic treatment. The oil-containing waste water and the monosaccharide containing water are subjected to an aerobic bacteria treatment process to yield pretreatment water capable of aeration treatment. The pretreatment water is subjected to an aeration treatment process while controlling BOD density and is subjected to a solid-liquid separation by flocculating with activated sludge.

Methods to increase the efficiency and throughput of hydrocarbon stream cracking by inhibiting the formation of, or resolving an emulsion, in an ethylene production quench water system. The method includes contacting a non-alkoxylated branched or linear polyethylenimine (PEI) with a quench water composition from the quench water system under conditions suitable to prevent the formation of an emulsion or to resolve the quench water composition into two immiscible phases.

A composition for temporarily-hydrophobic and oil-absorbent powder. The present invention cleans and neutralizes oily and toxic substances from items in water of bodies of water such as ocean floors or along the surface of bodies of water. The present invention initially repels water or water-based substances and then absorbs oil-based substances. The composition includes a quantity of quicklime, a quantity of oil, a quantity of earthworm enzymes, a quantity of water, a quantity of detergent, and a quantity of rubbing alcohol. The quantity of quicklime, the quantity of oil, the quantity of earthworm enzymes, the quantity of water, the quantity of detergent, and the quantity of rubbing alcohol are heterogeneously mixed into an absorbent slurry blend.

Methods for mitigating produced water cooler fouling in steam assisted gravity drainage (SAGD) systems are disclosed. In addition, methods for reducing fouling in SAGD systems with a produced water cooler by injecting a production fluid with a reverse emulsion with a demulsifier prior to phase separation of the production fluid, where the separation of water from the reverse emulsion is at a temperature above about 100 C. to form a separated water phase for subsequent steam generation, are disclosed.

The present disclosure relates to demulsifier compositions and methods of resolving emulsions using the compositions. The demulsifiers include modified hydroxy-succinimide copolymers. For example, the demulsifiers may include ethoxylated or propoxylated hydroxy-succinimide copolymers. The demulsifier compositions are useful for resolving oil-in-water, water-in-oil, and complex emulsions of water and oil.

Compositions for water treatment are provided. In some embodiments, the composition comprises: a cationic polyacrylamide-type polymer having a charge density of about 10% to about 40% and a molecular weight of about 60010.sup.4 g/gmol to about 90010.sup.4 g/gmol; and a cationic surfactant, the surfactant comprising an alkyl quaternary ammonium salt. Also provided are related methods and kits for treating wastewater with dispersed and dissolved organic matters and oils. Embodiments of the compositions, methods, and kits can be used to treat oil-in-water emulsions, produced water, and process water containing dispersed and/or dissolved organic matter such as hydrocarbons from various process industries including Steam Assisted Gravity Drainage (SAGD) oil operations.