In: Business and Management

Submitted By Shakes01
Words 1574
Pages 7
Greywater or sullage is defined as wastewater generated from wash hand basins, showers and baths.
Blackwater is a term used to describe wastewater from toilets, urinals and medical facilities. It is also known as foul water.

Terms used in ship sewage disposal

Treatment options onboard ships
Sewage can be processed with three principal methods: mechanical, chemical and biological. The treatment of sewage includes the following stages

1. Waste water accumulation and management
2. Waste water pre-treatment
3. Waste water oxidation
4. Waste water clarification and filtration
5. Waste water disinfection
6. Sludge treatment.
The sewage treatment is usually a combination of the three principal methods, such as mechanical-chemical, mechanical-biological and chemical-biological.
The shipboard sewage treatment plant should be small, simple, and reliable and have moderate running costs. The treatment plant should function well in all waste water concentrations and during flow peaks. The plant should be also easy to maintain and operate, and fulfill current purification requirements. The plant operation highly depends on the technical personnel and the sewage being cleaned.

− BOD5: 50 mg/l
− TSS: 100 mg/l (shipboard test)
− Faecal coliforms: 250 cfu/100 ml.

Waste water pre-treatment
Wastewater pre-treatment protects the other phases of the purification process. Sewage contains a lot of solid waste and grease that may cause problems in the later stages of the process. The pre-treatment process reduces the amount of solids in the waste water.
Effective wastewater pre-treatment also reduces the need for oxidation. The pre-treatment is mechanical and consists of sieving and sedimentation units. The large particles pass through a shredding pump before sieving.
The mechanical filtering results in a maximum of 50% reduction in organic load. The remaining organic…...

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