Abstract: The present invention relates to methods of refining and recovering barium sulfate from contaminated water sources that include barium cation, such as hydrofracture wastewater. The methods of the present invention result in the formation of a refined and a recovered barium sulfate that has a density of at least 4.10 g/ml, and a content of calcium ion of less than or equal to 250 mg/Kg.

Abstract: The present invention relates to a method and apparatus (5) for determining a change in volume within a vessel (11) with regard to fluid (14) being added or removed from the vessel. The method involves measuring first and second surface levels (20, 20?) of fluid (14) within the vessel (11) (with regard to fluid being added or removed therefrom), first and second roll values (23, 23?) of the vessel, and first and second pitch values (26, 26?) of the vessel. From these measurements, and in conjunction with the known interior dimensions and known interior total volume of the vessel, there are calculated first and second fluid volumes that are compared to determine a change in fluid within the vessel.

Abstract: The present invention relates to a method and apparatus (5) for determining a change in volume within a vessel (11) with regard to fluid (14) being added or removed from the vessel. The method involves measuring first and second surface levels (20, 20?) of fluid (14) within the vessel (11) (with regard to fluid being added or removed therefrom), first and second roll values (23, 23?) of the vessel, and first and second pitch values (26, 26?) of the vessel. From these measurements, and in conjunction with the known interior dimensions and known interior total volume of the vessel, there are calculated first and second fluid volumes that are compared to determine a change in fluid within the vessel.

Abstract: The present invention relates to a self-propelled vessel assembly (3) that includes a self-propelled vehicle (11) that includes an open-box bed (14). The self-propelled vessel assembly (3) further includes, a vessel (50) that is reversibly received (and reversibly resides) within the open-box bed (14) of the self-propelled vehicle (11). The self-propelled vessel assembly (3) additionally includes, a pump assembly (59) that includes at least one pump (62) and at least one conduit (e.g., 71) that is in fluid communication with the interior volume (56) of the vessel (50). The pump assembly (59) resides on a support structure (47) that is reversibly attached to the self-propelled vehicle (11).

Abstract: The present invention relates to methods of refining and recovering barium sulfate from contaminated water sources that include barium cation, such as hydrofracture wastewater. The methods of the present invention result in the formation of a refined and a recovered barium sulfate that has a density of at least 4.10 g/ml, and a content of calcium ion of less than or equal to 250 mg/Kg.