hamworthy - stp retrofit sta-c and st-c series
DESCRIPTION
HamworthyTRANSCRIPT
Technical Data Sheet: Water Systems
Retrofit STA-Cand ST-C Series
Super Trident SewageTreatment Plant
Hamworthy is the world’s leading manufacturer of marinesewage treatment plants. For over three decades our SuperTrident sewage treatment plants have been widely regardedas standard specification on all vessels.
Hamworthy’s STA-C/ST-C Super Trident sewage treatmentplants were the first plants in the market to be granted typeapproval in meeting the new IMO MEPC.159(55) standard,which employs more stringent black water effluent qualitytreatment guidelines. All sewage treatment plants installed onexisting ships on or after 1 January 2010, and on new shipswhose keels are laid on or after this date, must meet the newMEPC.159(55) guidelines.
The retrofit range has been specifically designed to reducethe cost of installing sewage treatment equipment intoexisting vessels. Each size in the retrofit range is built up fromthree separate water tight tanks connected by external piping,aiding installation. The dimensions of each component hasbeen arranged to permit its transportation through standardvessel access ways.
Standard features� IMO & MED certified and authorised by Lloyds Register EMEA� Modular construction� Single power supply input point� Minimal maintenance requirement� Solids handling Hamworthy centrifugal discharge pump
Optional features� Standby compressor� Standby discharge pump
Operating Principle
Aeration compartmentsRaw sewage enters the plant via the sewage inlet and passes througha coarse screen before entering the aeration compartments.Aerators located at the bottom of the tanks are fed by a rotarycompressor with air, producing fine bubbles which thoroughly mixand aerate the sewage. Feeding off the oxygen in the bubbles, theaerobic bacteria and micro organisms present in raw sewage breakdown organic waste material into carbon dioxide, air and watervapour. Feeding off both the air and organic waste, organismsmultiply and new bacteria cells are produced. Plant aerators are easilyremovable through the side or end of the tank for maintenance.Following the aeration process only effluent plus inorganic materialremains which is then displaced by raw sewage into the settlingcompartment.
Settling compartmentThe settling compartment has been designed to flocculate allinorganic material to the bottom of the hopper as activated sludge,which is then returned by air lift to the aeration compartments whereit is mixed with the incoming raw sewage for further treatment. Theclear supernatant liquid at the top of the settling compartment isthen displaced into the contact compartment. An outlet weir issituated at the centre of the settling compartment controlling theflow of supernatant into the contact compartment.
Contact compartmentAll remaining effluent minus organic/inorganic material displaced intothe contact compartment is dosed with sodium hypochlorite fordisinfection. Once the contact compartment reaches capacity, floatswitches connected to the discharge pump activate discharge. Duringdischarge, sodium bisulphite is added via a dosing pipe in order toneutralise any residual chlorine, producing clean, safe, effluent,suitable for discharging at sea. All dosing is fully automated.
Standard
MEPC.159(55)01/01/2010(new)
100 Geom meanMPN/100ml
35 Geom mean 25 Geom meanmg/l
125 Geom meanmg/l
6~8.5 Best Tech Practice<0.5 ppm
Coliform Suspended solids BOD (5) COD pH Residual Chlorine
0038/YY
Model
No.
ST2A-C (R)
ST4A-C (R)
ST6A-C (R)
ST8A-C (R)
ST2A-C (R)
ST4A-C (R)
ST6A-C (R)
ST8A-C (R)
IMO Cert.
Litres/Day
3260
5960
9200
12200
21
41
65
86
C
1398
1847
1937
2037
D
1900
2100
2550
2850
B
1678
1835
2035
2135
E
1174
1624
1724
1824
F
1265
1415
1615
1715
G
1290
1415
1765
2015
ref:
HW
S007
201
11
Retrofit STA-C and ST-C Series Water Systems
DISCHARGE(SETTLING COMPARTMENT)
SETTLING COMPARTMENT
EMERGENCY OVERFLOW
VENT TOATMOSPHEREFOR REMOVAL OF
LEVEL SWITCH
STANDBY COMPRESSOR
AIR COMPRESSORCOMPLETE WITHRELIEF VALVE &FILTER
LIFTING LUGS CONTROL PANEL
COMBINED HIGH LEVEL,LOW LEVEL & HIGHLEVEL ALARM FLOATSWITCH
180
DISCHARGE FORAERATION ANDCONTACT TANKS
C
E
DFG
CONTACT COMPARTMENT
RAW SEWAGE INLET
PRIMARY AERATION COMPARTMENT
SECONDARYAERATION COMPARTMENT
A
B
Size of aperture through which unit willpass when separated into three parts with
panel, transfer tubes, chlorine tabletmagazine and vent tubes attached.
Size of aperture through which unit will pass whenseparated into three parts with panel, transfer tubes and
studs, chlorine tablet magazine andvent tubes and covers removed.
Dimensions (mm)
Hamworthy Water Systems Limited
Fleets Corner, Poole, Dorset BH17 0JT. England.
tel: +44 (0)1202 662600. fax: +44 (0)1202 668793.
e-mail: [email protected]
website: www.hamworthy.com/sewagetreatment
a subsidiary of Hamworthy plc
The manufacturers reserve the right to alter thespecification and data to incorporate improvements in design.Certified drawings will be issued on request.
© All details copyright Hamworthy plc.
655 x 1220
730 x 1670
830 x 1770
880 x 1870
867 x 1371
942 x 1821
1042 x 1921
1092 x 2021
No. of people(under normal gravitycollection conditions) A
2318
2518
3024
3324