Bethlehem Steel Corporation

Isg Technologies Inc.

Richard T Sewald, Sr

Stewart T Herman

Charles J Sterner

Joseph Bartosh

James B Pfeiffer

Zachary J Lezoche

The present invention provides a water treatment apparatus and method for reducing toxicity in zinc containing acid stormwater runoff, the apparatus comprising a first filter layer of high calcium material a last filter layer comprising a drainpipe arrangement embedded within an aggregate; and at least one intermediate filter layer comprising a wood mulch material positioned between the first filter layer and said last filter layer.

Method for removal and detoxication of dissolved metals in a rainwater discharge

An industrial wastewater treatment method is described whereby heavy metals dissolved in the wastewater are precipitated as a slurry which, when allowed to settle, will form a sludge containing at least 10 weight percent solids. In the method, an aqueous suspension or solution of a neutralizing agent is introduced into a first reactor. A suspension containing particles of carrier agent is also introduced into the first reactor. A portion, if not all, of the neutralizing agent is adsorbed on the surface of the particles of the carrier, which are maintained in suspension in the first reactor. The carrier, with its adsorbed neutralizing agent, is passed to a second reactor and simultaneously the contaminated industrial wastewater is added to the second reactor. The pH of the wastewater is adjusted to a range between 8.4 and 10.6 by the neutralizing agent. Within such pH range, a substantial portion, if not all, of the heavy metals are precipitated in the form of a slurry. The mixture in the second reactor is passed to a solids separation device. The solids in the slurry settle to the bottom of the device to form a sludge which is removed therefrom. Purified water is removed as an overflow from the separation device. Optionally, a flocculant may be added to aid in settling the solids. Insoluble calcium salts may also be precipitated in the second reactor. Such insoluble salts are adsorbed on the surface of the carrier and/or the heavy metal slurry particles and become part of the sludge formed in the separation device.

Treatment of industrial wastewaters

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Bethlehem, PA, United States of America

Richard T Sewald, Sr