Marine Sewage Treatment Plant
1. The Importance to Install a Sewage Treatment Plant
With the continuous development of the shipping industry and marine development, the pollution of the marine environment has become more and more serious, and human beings have paid more and more attention to marine environmental protection. The marine sewage treatment device is a special treatment device installed on the ship in order to prevent the sewage generated by the ship from polluting the waters. Marine Sewage Processors are mainly divided into black water(sewage containing fecal matter) and black gray water(All sewage including black water) types.
Marine Sewage Treatment Plant belongs to the key devices for prevention of pollution form ships in seas and oceans according to the revised Annex IV of the International Convention of the Prevention of Pollution (MARPOL 73/78).This device is applicable to treat the sewage, which means human body wastes and the wastes from the toilets on vessels and which is also called “black water”, to meet the effluent standards of IMO. MEPC.159（55), and discharge the effluent overboard . This device is according to the resolution MEPC.159(55) enacted on 13 October 2006.The convention (MARPOL 73/78) provides that all STPs installed on board on or after 1 January 2010 should meet the resolution MEPC159(55) and MEPC.227(64).
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Main Products
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The device adopts activated sludge, contact oxidizing and principle of biologic membraneto digest the organic pollutant, which can treat sewage effectively and meet the IMO new effluent standard or other stricter requirements.
The treatment procedures of the plants are shown as following:
In 1st stage aeration tank, the activated sludge which mainly are aerobic bacteria, will become gossypine organic matter with adsorptivity. And then become harmless carbon dioxide and water though eliminate organic matter in the aerobic conditions.And the activated sludge will breeding in the meantime. The bacteria will die as the persistent ganic pllutants become less which eat cenobium. The dead bacterium is digested by the protozoa and the metazoan, which attached in the active sludge. 95% of the effluent is easy-disgusted organic substance, they are oxidized entirely.
Soft bio-membrane stuffing is hanged in the 2nd stage contact oxidation compartment. The biomembrane, which can digest organic substance, floated in water. Greater part of the metazoan live in the fiber biomembrane. The organic substance is further digested. The active sludge sediment accumulated in the setting tank is to be returned to the 1st stage aeration tank for reproducing of aerobe medium.
To restart the plant in a long time is much faster, because there are much bacterial spores living in the biomembrane.
The settling treated sewage will flow to disinfection cabinet for sterilizing by chlorine drugs. Then discharge to sea though discharge pump.
The sludge usually should be discharged every three months which depands on the sewage quality and load
Summary all the rules and effluent standards as followings:
Picture of Marine Sewage Treatment Plant
IMO MEPC.159(55)
IMO MEPC.227(64）
USCG
Alaska
TSS (mg/l)
35
≤35Qi/Qe
150
30
BOD5 (mg/l)
25
≤25Qi/Qe
NR
30
COD (mg/l)
125
≤125Qi/Qe
NR
NR
coliform (per 100ml)
100
100
200
20
PH
6~8.5
6~8.5
NR
6~9
Residual chlorine (mg/l)
＜0.5
＜0.5
NR
10
Ammonia Nitrogen (mg/l)
NR
NR
NR
10
Total Nitrogen (mg/l)
NR
≤20Qi/Qe (or 70% scalage at least)
NR
NR
Total Phosphorus (mg/l)
NR
≤1.0Qi/Qe (or 80% scalage at least)
NR
NR
IACS Certificate Options: BV, CCS, NK, DNV, GL, IRS, ABS, LR, RMRS, RINA
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