Nalco Chemical Company

Pek L Choo

Kristine S Siefert

Kristine S Salmen

David A Picco

Michio Kobayashi

Wayne M Carlson

Bruce A Keiser

John H Collins

John W Sparapany

Maureen B Nunn

A method for the manufacture of paper comprising the steps of:

Colloidal silica/polyelectrolyte blends for pulp and paper applications

This invention relates to the clarification of natural waters containing turbidity-causing components. This method comprises the addition of a stable colloidal silica suspension and water based polymeric coagulant to the turbid water. The components of the invention may be added independently, or blended together so that addition is simultaneous. The colloidal silica may also be conditioned by passing over a cationic exchange resin prior to addition of cationic polymer.

Colloidal silica/polyelectrolyte blends for natural water clarification

This invention relates to a composition of matter of a silica sol/water soluble cationic polymer mixture. The colloidal silica may also be conditioned by passing over a cationic exchange resin prior to addition of cationic polymer.

A wastewater treatment system and method for chemical precipitation and removal of metals from wastewater in a continuous or batch treatment process includes an ion-selective sulfide electrode and a reference electrode disposed in a precipitation tank for measuring an electrochemical potential therebetween in a predetermined range. A controller unit is provided which is responsive to the electrochemical potential in the predetermined range and is connected to a precipitant feed unit for automatically controlling the chemical precipitant fed into the precipitation tank.

Sulfide ion-selective electrodes for control of chemical feed of organic

A method is provided for removing metals from a fluid stream containing these metals. The method involves treating the fluid stream with a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 that contains at least 5 mole percent of dithiocarbamate salt groups to form a complex with the metals. Then, the fluid stream is passed through a filtering device to remove the complexes from the fluid stream.

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Naperville, IL, United States of America

Pek L Choo