초록 ▼

A method for reducing or preventing the formation of scale in a municipal or industrial waste water treatment facility comprising introducing an antiscalent composition which comprises:A) A water soluble polymer of molecular weight below 20,000 and containing anionic groups, andB) A sequesterant com

A method for reducing or preventing the formation of scale in a municipal or industrial waste water treatment facility comprising introducing an antiscalent composition which comprises:A) A water soluble polymer of molecular weight below 20,000 and containing anionic groups, andB) A sequesterant compound, selected from the group consisting of phosphonates, phosphates, metaphosphates and orthophosphates including derivatives and salts thereof. Preferred antiscalent compositions include a blend of A) a polymer of acrylic acid and/or maleic acid and B) diethylentriamine penta (methylenephosphonic acid) or salts thereof. The invention is of particular value for the treatment of struvite scale in sewage treatment works.

대표청구항 ▼

1. A method for reducing or preventing the formation of scale or removal of scale including struvite in a municipal or industrial waste water treatment facility comprising introducing an effective amount of an antiscalent composition that removes struvite scale which comprises:A) a water soluble pol

1. A method for reducing or preventing the formation of scale or removal of scale including struvite in a municipal or industrial waste water treatment facility comprising introducing an effective amount of an antiscalent composition that removes struvite scale which comprises:A) a water soluble polymer of molecular weight below 20,000 and containing anionic groups, and B) a sequesterant compound containing at least one phosphonate group and salts thereof, wherein component (A) is a partially or fully neutralized homopolymer of acrylic acid, wherein the antiscalant composition comprises 25 to 75% by weight of component A and 25 to 75% by weight of component B.