Ppg Industries, Inc.

Bay Chemical and Supply Company

Thomas J Nier

Tosby L Linn

Charles K Edge

Merritt J Hummel

A method of controlling algae in a municipal water plant including the step of adding an algicide-flocculant solution including 25-50 wt % acidic flocculent, 0-10 wt % polymer flocculant aid, an algicide consisting essentially of copper having a concentration of 0.025-1.275 wt % in the form of a water soluble copper salt, balance water. The algicide-flocculant solution may be added to the water via a clarifier of the water plant, a basin of the water plant, or a mixing chamber. The mixing chamber may be located within the clarifier, adjacent to the basin, or upstream of the clarifier and/or the basin.

Water treatment process

An algicide-flocculant solution for use in treating raw water in a municipal water plant to control algae, the algicide-flocculant solution including 25-50 wt % of an acidic flocculant, 0-10 wt % of a polymer flocculant aid, an algicide of essentially copper having a concentration of 0.025-1.25 wt % in the form of a water soluble capper salt, and balance water. Uniform mixing of the flocculant into the raw water simultaneously uniformly mixes the algicide of the algicide-flocculant solution into the raw water. The acidic flocculant is preferably aluminium sulfate, iron sulfate, iron chloride or mixtures thereof. The water soluble copper salt is preferably copper sulfate, copper chloride, copper nitrate, copper acetate or mixtures thereof. Moreover, the flocculant aid is a high molecular weight quaternary amine such as diallyldimethylammonium chloride.

Water treatment composition

A water soluble copper salt, preferably cupric sulfate pentahydrate, is mixed with water. A small quantity of an acidic flocculant is added to the copper sulfate solution to acidify the water and promote dissolving of the copper sulfate in the water. A 25-50% water solution of an acidic flocculant, with or without a cationic polymeric flocculant aid, is prepared and pumped into a processing vessel or tank. The acidified copper sulfate solution is added to the tank and mixed with the acidic flocculant. The algicide-flocculant solution is transported to a municipal water plant and added to raw water in the clarifier to drop out particulates in the incoming water and control algae in the clarifier.

A glass forming chamber wherein glass is formed while floating on the surface of a pool of molten metal is provided with a submerged plate in the pool of molten metal, which plate is contoured to divert the flow of molten metal in a central portion of the pool beneath an advancing layer of glass and to cause the flow of molten metal from the central portion into marginal portions of the pool or vice versa.

Submerged plate for selective diversion of molten metal flow in a glass

A glass forming chamber wherein glass is formed while floating on the surface of a pool of molten metal is provided with submerged dam barriers in the pool of molten metal which dam barriers are contoured to inhibit the flow of molten metal in a central portion of the pool beneath an advancing layer of glass relative to the flow of molten metal in marginal portions of the pool including marginal portions between the edges of a floating layer of glass and side walls of the forming chamber.

Submerged dam barriers for selective diversion of molten metal flow in a

A method for forming flat glass of high optical quality on a bath of molten tin, in which the glass has a relatively short residence time, is disclosed. The method involves adding an oxidizing agent to the hotter regions of the molten tin bath which is believed to modify the bottom or tin-contacting surface of the glass while the glass is on the bath of molten tin so as to be able to produce glass substantially free of top surface distortion, a problem which is particularly severe for glass having relatively short residence times on molten tin.

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Corpus Christi, TX, United States of America

Thomas J Nier