6.14 Flashcards
What chapter of the NAVMED P-5010 deals with Wastewater Treatment and Disposal Ashore and Afloat?
Chapter 7
What does CHT stand for?
Collection, Hold, and Transfer
What are the Medical Department Responsibilities?
- Conduct visual inspections of marine sanitation devices (MSD) components as part of the routine habitability and sanitation inspection.
- Indoctrination of personnel concerning the potential health hazards associated with human wastes, proper personal hygiene necessary to reduce the risks associated with working with MSD systems, and the correct procedures for cleaning and disinfecting contaminated spaces. (a) Training is also provided periodically.
- Provide on-site advice, when requested in the event of major sewage leaks or spills.
- Medical Department Representative must be present during clean-ups and disinfection operations involving food service spaces, living spaces and medical spaces.
Collection Hold and Transfer System (CHT) operates in what 3 modes?
- Restricted waters
- At sea
- In port
What is CHT Type II-B?
Marine sanitation device
3 Functional elements of the CHT system
- Collection element
- Hold element
- Transfer element
Collection element
- Soil drains or sewage (from toilets and urinals)
- Gray water drains (from showers, laundries, and galleys)
- Diverter valves which direct the wastewater over the side or to the holding tanks
Tanks are normally sized for what holding period depending on individual ship constraints?
12 hour
What does SWOB stand for?
Ship Waste Off-Loading Barge
What poses the greatest danger to ships and personnel?
Hydrogen Sulfide (H2S)
Untreated sewage when held in tanks larger than how many gallons must be aerated?
2,000 gallons
What can happen to untreated sewage if it is not aerated?
Can become explosive
Never enter a CHT pump room if H2S odor is detectable unless
wearing a supplied airline respirator with full face mask
Pump rooms should have:
- Slight negative pressure (exhaust ventilation within 9 inches of deck).
- Ventilation indicator light mounted outside pump room
- 2 EEBDs
- Warning plates (outside pump rooms and near tank access)
EEBDs are good for how long?
10 min
MSD components must be regularly inspected for leaks by engineering personnel
- Paper towel test (pinpoint small leaks)
- All leaks, spills, or other sources of contamination must be reported: Engineering Officer,
Executive Officer, and SMDR.
4 Toxic or explosive gases associated with CHT
- Hydrogen sulfide
- Methane
- Ammonia
- Carbon Dioxide
Which toxic gas smells like rotten eggs?
H2S
Personnel who are in contact with wastewater must have what immunizations?
- Polio
- TDap
Required Personal protective equipment:
- Coveralls
- Rubber Boots
- Rubber Gloves
- Face Shields
- SCBA (when necessary)
CHT workers should adhere to the following:
- Movement of contaminated clothing/equipment must be minimized
- Contaminated clothing must be placed in a plastic bag
- Washed with hot soapy water
and treated with approved disinfectant solution. - No hand to mouth contact while in direct source of contamination
Disinfectants must be approved by who?
EPA
What are the 2 types of Germicides:
- Phenolic Type
- Iodine Type
Color coding for CHT systems ship’s interior color code is
Gold
Deck discharge stations must be
clearly labeled.
Exterior deck discharge must be same color as…
surrounding structure
Procedures for all ship to shore transfer facilities
NAVFAC Pub 340
The overboard discharge of untreated sewage within U.S. waters and territorial seas is prohibited within
3 NM of shore
CHT systems are designed to operate in three modes:
- At sea
- In port
- In Restricted waters
Wastewater Disposal Procedures At Sea:
Sewage and gray waters, including those stored in holding tanks are diverted or discharged overboard
Wastewater Disposal Procedures In port:
Sewage and gray water is collected in holding tanks and discharged into a sanitary sewer through sewer risers or Ship Waste Off Load Barges (SWOB)
Wastewater Disposal Procedures In restricted waters:
- Sewage is collected and stored in holding tanks.
- Gray water is discharged overboard via diverter valves.
