Page 88: of Maritime Reporter Magazine (September 1996)

Toward Environmentally Sound Warships collected and averaged for NATO navies in a manner similar to that for solids. Only volume data was developed, because volume man- agement is the important issue with liquid waste. Grey water dominated, followed by oily water, waste oil and black water.

Gaseous

Profiles

Waste Generation

For gaseous waste, the correlation between quantity of waste generat- ed and number of personnel was not strong; rather, a correlation was found between a 'ship's installed power' and 'quantity of waste generated.'

Gaseous waste was divided into two categories: engine and boiler 88 Circle 218 on Reader Service Card exhaust.

Other sources were comprise

VOCs discharged during fuel li ing or transfer; halons from extinguishing systems; and charge of ODSs, such as CFCs

HCFCs during maintenance ope tions, and vapors from the use solvents, varnish and cleaners.

Looking toward projected wa generation rates by the year 20t several trends were noted. T dominant trend regarding chang in waste generation is a gradu decrease in the number of sh personnel on each vessel throu£ increased automation and efficiei cy. Other trends include projecte improvements in waste treatmer technology, packaging enhance ments and changes in handling.

Technologies

A wide range of technologies exisl for waste treatment, some not yet demonstrated for naval use. The technologies considered in this study included the following:

Sterilization

Coalescence

Membrane separation

Evaporation

Vapor compression distillation

Electrocoagulation

Shredding / compaction + heat

Shredding / compaction

Water maceration

Shredding

Supercritical water oxidation

Biological treatment

Plasma combustion

Incineration (advanced)

Electrochemical oxidation

Wet oxidation

Catalytic oxidation

Catalytic reduction

Scrubbing

Shipboard installations are pro- jected to comprise several approaches rather than a single approach. These approaches will be formed into systems that will address waste separation, treat- ment, disposal and storage.

Based on an assessment of typical operational profiles and crew sizes, assessments were developed for small ships (e.g., corvettes), medi- um ships (e.g., frigates) and large ships (e.g., aircraft carriers). From the assessments, example designs were developed to illustrate how environmental technologies could be combined onboard ships to suc- cessfully meet the requirements of environmental regulations.

Maritime Reporter/Engineering News