Hamworthy sewage treatment plants ordered last year are destined for a variety of ship types in the cruise, offshore, merchant shipping and military sectors.

“These orders demonstrate our strength in the market for supplying sewage treatment plants,” said Joe Oatley, Chief Executive of Hamworthy. “Hamworthy has a leadership position by providing innovative technological solutions to meet our customers’ needs.”

The Hamworthy Super Trident sewage treatment plant is fully compatible with gravity and vacuum collection systems. It operates on the activated sludge/suspended aeration system, accelerating natural biological processes to produce a clean and safe effluent suitable for discharging at sea.

The most popular model is Hamworthy’s Super Trident ST2A, certified for up to 3,120 litres/day of black water, of which 326 units have been ordered.

Thirty-eight Trident units have been ordered as ‘Retrofits’ which are sectionalised units that can be split into three parts to ease installation on existing ships.

Forty-two units are for a newly enhanced design of sewage treatment plant that meets more demanding standards required in 2010. Hamworthy has recently received both EC Marine Equipment Directive (‘Wheelmark’) certification from the UK Marine & Coastguard Agency and type-approval certification from Lloyd’s Register for these enhanced requirements. These standards conform to the MARPOL Annex IV related guidelines that apply to equipment installed on existing ships on or after 1 January 2010 and new ships whose keels are laid on or after this date. The new plant has been specified by shipbuilders Samsung and Hyundai in South Korea.

IMO’s Marine Environment Protection Committee adopted revised guidelines on effluent standards and performance tests for sewage treatment plant in October 2006. These new MEPC 159(55) guidelines will supersede the existing MEPC 2(VI) guidelines, adopted in 1976, and specify tougher standards for all effluent quality parameters.