Method and system for treating ballast water

摘要

Ballast and/or cooling water biocidal treatment and disinfection systems and techniques are provided. The systems utilize oxidation reduction potential control to regulate addition, or concentration of an electrocatalytically generated biocidal agent to disinfection levels in ship buoyancy and to biofouling levels in ship cooling water systems. The disinfection and biofouling control systems provide suitable treatment while reducing the potential for corrosion of ship components and, in some cases, undesirable disinfection byproducts.

主权项

1. A shipboard water treatment system comprising:
a source of seawater in a sea chest; a ballast tank fluidly connected to the sea chest; a shipboard cooling water system fluidly connected to the sea chest; a first sensor disposed to measure and transmit a first measured signal representative of an oxidation reduction potential (ORP) of seawater in the sea chest; a second sensor disposed to measure and transmit a second measured signal representative of an ORP of seawater in the ballast tank; a biocide source that produces a biocide containing stream disposed to introduce a biocide into the seawater in the sea chest via a first flow path comprising a first line that delivers the biocide containing stream into the sea chest, to introduce the biocide into the seawater in the ballast tank via a second flow path split from the first flow path comprising a second line, and to receive seawater withdrawn from the cooling water system; and a controller disposed to receive the first measured signal from the first sensor and to receive the second measured signal from the second sensor, and configured to generate and transmit an output signal, based at least partially on the first measured signal, the second measured signal, and a target ORP value in a range of from about 200 mV to about 1000 mV, to the biocide source to regulate a rate of introduction of the biocide into the seawater in the ballast tank, and into the seawater in the sea chest to achieve a target biofouling control value in water introduced into the shipboard cooling water system.