Atlantic Richfield Company

Envirocorp Services & Technology, Inc.

Edward Malachosky

William N Wilson

Roger D Bradshaw

James B Bloys

Roger A Grey

Thomas K Perkins

Robert B Carpenter

Winton G Aubert

Walter H Stanton

Ronnie D Gordon

Fred Applegath

Donna M Lantero

Joseph P Sheldon

A process for treating acid wastewater containing heavy metals has been invented, the process including adding fly ash to the acid wastewater to reduce heavy metals content of the acid wastewater. In one aspect the acid wastewater contains soluble iron and adding fly ash reduces the level of soluble iron. In one aspect the acid wastewater contains sulfate ions and adding fly ash reduces the sulfate ion level. In one aspect solid silicate salts are added to the acid wastewater. Preferably undesirable very hydrous iron hydroxide precipitate is not formed. In certain aspects the pH of the acid wastewater is raised to an environmentally acceptable level. In one aspect the process is a batch process. In another aspect the process is a continuous process.

Acid wastewater treatement

The present invention, in certain embodiments, teaches a process for treating ammonia or ammonium-sulfate-containing waste effluent from an acrylonitrile, caprolactam or acetonitrile manufacturing facility. In one such process the effluent is fed to a deep well oxidizer, e.g. a water oxidizer vertical tube reactor (super critical or subcritical), to degrade organic contaminants. Certain embodiments of the deep well oxidizer have, according to this invention, an oxygen inlet tube movable by a coil tubing system. The output stream from the vertical tube reactor is, preferably, filtered, and then it is fed to an electrodialysis unit. In one aspect the electrodialysis unit produces an output stream at a pH of about 5 with a concentration of ammonium sulfate at least, preferably, of about 15% by weight, and most preferably between about 20% and about 26% by weight. This output stream may be neutralized and then further treated to remove ammonia and/or ammonium sulfate solids, e.g. by a downstream ammonia stripper, evaporator, and/or crystallizer system or combination thereof.

Production and purification of contaminated effluent streams containing

Liquid wastes and slurries of ground solids wastes are injected into earth formation zones which have a fluid content of fluid similar to the liquid wastes or slurry which is below the irreducible saturation level for the liquid wastes or slurry to be injected. The formation may be non-hydrocarbon bearing or a depleted hydrocarbon bearing reservoir which has been depleted by enhanced fluid recovery techniques below its ambient irreducible fluid saturation value.

Subterranean disposal of liquid and slurried solids wastes

A dispersant for drilling fluids, spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.

Dispersant compositions comprising sulfonated isobutylene maleic

A dispersant for spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.

Dispersant compositions for subterranean well drilling and completion

Drilling cuttings comprising usable gravel, silts, clays and spent drilling fluid are reclaimed and disposed of during or after the process of drilling a well by separating construction-grade gravel from the drilling fluid and washing the gravel, if necessary, prior to storage or placing it in use as construction material. Solids not reclaimed for construction use are formed as a slurry and conducted to an injection well by and through centrifugal pumps or mechanical agitators for dispersing the fine solids in the slurry to aid in the injection process. Gravel wash water may be used as a component of the waste slurry and the slurry may be conditioned for injection by the addition of surfactants and dispersants.

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Coppell, TX, United States of America

Edward Malachosky