Marine Sewage Treatment Plant For 20 Persons

● Series: SWCB
● Rated capacity: 6~400p
● Auto-control
● Inside "MBR" technology

Description

Marine sewage treatment plant is applicable to treat the sewage from the toilets on ships to satisfy international standards for effluent discharge. The plant can be used for sterilizing grey water on ships as well.

● Marine sewage treatment plant principle

The plant adopts the principle of traditional aeration and contact oxidization biochemical treatment and chlorine disinfection, using activated sludge and soft stuffing medium, Due to the air pump stop and start occasionally, it can solve the nitration problem and overcome the sludge expansion caused by thread-like bacteria, which is also called “cancer” in traditional continuous aeration treatment plant.

● Main feature

1. Adopting horizontal circular design, ellipse closures on both ends, pressure resistance and compact structure, for 6 to 10 persons use it can be designed of square type.

2. The device is adopted auto-control, and compliance with the requirement of 24-hours unattended cabin.

3. Adopting the "MBR" technology, devices allow to the narrow size, and solve the conflict of small space of cabin, but big volume of device.

4. The intermittent aeration in bio-membrane tank and hollow fiber membrane tank, form the process of "aerobic - anoxic", and resolve the problem of "nitrogen and phosphorus removal".

5. The device is adopting the principle of “air-lifting” to transfer the sludge from sediment tank and membrane tank to aeration tank, meantimes the “pump stops and air never stopped”, so as the scale on the membrane surface comes down. Due to back flushing and clean the membrane “online” usd technology patent.

6. "On-line" cleaning technology, making the dirt on membrane off automatically, recover membrane flux. It can be solved the problem of opening the cleaning or replacement of membrane difficultly caused by the small space in cabin.

7. The effluent after further treatment can be reached at the requirement of “water recovery”.

● Standard of Ship Sewage Water Treatment Plant

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.

● Discharge standard for SWCM sewage treatment plant

Convention	IMO	IMO	USCG	Alaska
Discharge	Old standard	New standard
Standard
TSS (mg/l)	<50	<35	<150	<30
BOD5 (mg/l)	<50	<25	N/A	<30
COD (mg/l)	N/A	<125	N/A	N/A
Coliform (pcs/100ml)	<250	<100	<200	<20
PH	6~9	6~8.5	N/A	6~9
Remaining Cl (mg/l)	N/A	<0.5	N/A	10
Type test (days)	10	10	10	30

● Principle Descriptions:

The SWCB series unit has four parts: aeration tank, contact oxidizing tank, sediment tank and disinfection tank.

In the 1st stage aeration tank, the activated sludge mainly consisting of aerobic bacteria form sticky flock to absorb the organic substance, break it into carbon dioxide and water under the condition of aerating and produce new activated sludge in the meantime. Soft film stuffing is hanged in the 2nd stage contact oxidizing compartment, the organic substance is further digested. The active sludge sediment accumulated in the setting tank is to be returned to the aeration tank for reproducing seeds and retreating.

The clear liquid is then led into the chlorination tank, and the remaining bacteria is killed by chlorine, the resulting harmless liquid is discharged overboard by discharge pump

● Technical parameter

Model		SWCM
Model		6	10	15	20	25	30	40	50	60	80	100	150	200	250	300
Load	Average load	490	840	1190	1540	1890	2310	3080	3780	4480	6020	7700	11200	14700	18200	23100
	Peak load	62	105	149	193	237	289	385	473	560	753	963	1400	1838	2275	2888
	Organic load	0.245	0.42	0.595	0.77	0.945	1.155	1.54	1.89	2.24	3.01	3.85	5.6	7.35	9.1	11.55
Rated capacity (Persons)		6	10	15	20	25	30	40	50	60	80	100	150	200	250	300
Max capacity(P)		7	12	17	22	27	33	44	54	64	86	110	160	210	260	330
Electricity		AC 380V50Hz3φ/AC 44060Hz3φ
Power (KW)		1.5	1.5	1.5	1.5	1.5	1.5	1.5	2	2	2.5	2.5	3	3	3	3
		1000	1300	1450	1500	1550	1650	1750	2000	2100	2500	2800	3200	3500	3800	4300
External dimensions		×	×	×	×	×	×	×	×	×	×	×	×	×	×	×
Lengthwidth height		1170	1170	1320	1420	1470	1570	1670	1770	1920	2020	2200	2350	2750	2850	3150
		×	×	×	×	×	×	×	×	×	×	×	×	×	×	×
		1250	1380	1430	1480	1530	1680	1880	1850	1880	1930	2080	2250	2250	2250	2250
Weight	Dry weight	900	1050	1150	1200	1250	1350	1500	1750	1950	2150	2900	3800	4050	5000	6000
	(Kg)	900	1050	1150	1200	1250	1350	1500	1750	1950	2150	2900	3800	4050	5000	6000
	Wet weight	1580	2100	2600	2933	3210	3928	4689	5665	6486	8100	10400	14680	18330	22100	28172
	(Kg)	1580	2100	2600	2933	3210	3928	4689	5665	6486	8100	10400	14680	18330	22100	28172
Discharge standard		BOD550mg/LSS50mg/LColiform250/100mlPH6∼9