Abstract: A method for removing negatively charged insoluble lead from water including contacting water containing negatively charged insoluble lead with an adsorption medium having a positive charge. The treated water has reduced levels of insoluble lead.

Abstract: A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least one reaction zone, and at least one source of hydroxide ions is provided into the at least one reaction zone in an amount sufficient to precipitate at least some of the mass of the at least one metal. The aqueous solution includes a mass of the at least one metal and a mass of at least one reducing agent. The at least one reducing agent includes at least ferrous iron from at least one source of the at least one reducing agent. A composition of tungsten ferrite or molybdenum tungsten ferrite may be formed. The method may be used for purifying water, for the refining of metals, or to facilitate a chemical analytical determination.

Abstract: A water-purification system is provided. The water-purification system includes a bacteriostatic filter including a bacteriostatic agent therein and a membrane filter fluidically coupled downstream of the bacteriostatic filter and configured to block the passage of cations and anions therethrough.

Abstract: A tubular fabric article is gripped at either end on gripping rings (24) which can be rotated and moved axially with respect to a fixed position D-D. A fixed needle mechanism (30) extends within the tubular article. A needle (36) is oscillated between a retracted and extended position and cooperates with a hook and bobbin mechanism to form stitches.

Abstract: System and method for purifying and recycling spent brine in a water softener are provided. The system may be made up of a cation exchange resin tank fluidly coupled for passing spent brine comprising monovalent and divalent ions. A fluid mixer valve is coupled to the resin tank and to a water tank to dilute the spent brine to a desired concentration of a regenerant salt, e.g., NaCl. An ion-separation device is fluidly coupled to the fluid mixer valve to receive the diluted spent brine and separate the diluted spent brine into first and second streams. The first of the streams comprises monovalent ions and the second of the streams comprises divalent ions.

Abstract: The present invention relates to a method and apparatus for removing contaminants from a solvent based cleaning fluid. An article cleaning apparatus comprises an ultrafiltration filter having a pore size of about 0.01 microns to about 0.2 microns. A method for performing a solvent based cleaning process using an article cleaning apparatus comprises passing a solvent based cleaning fluid through an ultrafiltration filter having a having a pore size of about 0.01 microns to about 0.2 microns.