Discharge sewage is the drainage and other wastes from any form of toilet or driller or any other waste water when mixed with such drainages incorporated with this description, the term sewage includes human faces wastes, sewage does not include grief water. I waste water from showers and sinks unless it is mixed with any of the above
However, any discharge from vessel will be either the following categories
– Treated sewage
– Untreated sewage
Treated swage : This has passed through on board treat let system and has
three distaste grades grade A, B andC
C: Lowest level
B: Higher level
A: Highest level
Macerated sewage is an untreated sewage
Untreated (raw sewage): It has non passed Through treatment system. This sewage that is discharge directly into the water way in areas where discharge is permitted or contained in on board holding tank. Any unrelated sewage that is discharged, in areas where it is permitted, must first pass through a macerator
Since Melbourne services limited separates with a declared ship ( A class one Commercially registered carrying vessel fitted with a toilet)
The vessel have fitted sewage holding tank after storing disposed off on shore according to ship board sewage management plan.
The process of excessive deposition of chemical nutrients in water is termed eutrophication . This is one of the problems caused by sewage polluted H2o
Toxins released in rivers through sewage water are consumed by fish and other organisms, the possibility of toxins entering the food
It degrades water quality
Reduces the number of fishes
Increases biological oxygen demand (BOD)
SEWAGE TREATMENT MEANS
Firstly primary treatment through grinding mechanism and then pasted through the setting several chamber chambers and neutralized with lime, up to this stage .
The sewage will still certain a large number of pathogenic and non pathogenic organisms and also sufficient organic matter . The neutralized effluents are sent to UASBC up flow anaerobic sludge blanket). It is a reactor in this, the anarchic bacteria degrades the biodegradable materials present in the waste l water. This release mouse foul odour and releases methane, which can be used else where . in this system, the pollution load is reduced up to 85% , after this, water is sent to aeration tank where it is mixed with air and bacteria
And the bacteria digests the organic waste materials this is called biological or secondary treatment . Even after the treatment, water is still until for drinking. The harmful microorganisms needs to be called
TERTIARY TREATMENT
HOUSEKEEPING/ HYGIENE
This means the orderly arrangement and to placement of equipment, too is and materials both raw and finished and wastes Good house keeping improves the hygienic condition of it work and reduces potentials for accident, fire essentials for all sites
PROCEDURE
– Daily cleaning of work places
– Designation of areas for water materials
– Proper receipt and storage of raw materials in designated areas
– Clearing of floors remove duties can
– Storage of flammable materials in safe place separate from non flammable materials . also applicable of some toxic and corrosive materials
– Proper dispersal of rags and a loose materials
– Proper arrangement of tools, by removing from and storing in a appropriate toxic box
– Extension cables on flexible power supply and hand tools should be collected approximately
Materials should be stacked to block emergency exists or fire fighting equipping
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