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This plant 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 to overboard. It is also applicable to treat galley & shower drainage which is called “grey water” on condition that the “grey water” should be pretreated and should select a bigger capacity model to match with.

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). The MEPC.2 (VI) resolution adopted on 3 December 1976 is the present guidelines on implementation of effluent standards and performance tests for STP, which is called “old standards”. This device is according to the MEPC.159(55) resolution enacted on 13 October 2006, which is called “new standards”. The convention (MARPOL 73/78) provides that all STPs installed on board on or after 1 January 2010 should meet the MEPC.159(55) resolution.

Summary all the rules and effluent standards as followings:

IMO
Old standard
IMO
New standard
USCG
Alaska
TSS (mg/l)
50
35
150
30
BOD5 (mg/l)
50
25
NR
30
COD (mg/l)
NR
125
NR
NR
coliform (per 100ml)
250
100
200
20
PH
6~9
6~8.5
NR
6~9
Residual chlorine (mg/l)
NR
＜0.5
NR
10
Duration of type approval test (days)
10
10
10
30

The SWCM type marine sewage treatment plant uses activated sludge, contact oxidizing and principle of biologic membrane to digest the organic pollutant, which can treat sewage effectively and reach at the IMO new effluent standard or other stricter requirements.
The device is patent product, provided with independent innovation intellectual property.