Chinas First Deep Sea Gas Field to Use Severn Trent De Nora Electrolytic Treatment Technology

Severn Trent De Nora has received a contract to provide its electrolytic disinfection treatment solutions for biofouling control and wastewater treatment to the China Offshore Oil Engineering Corporation for its Liwan 3-1 deep sea gas field project in the South China Sea. The Liwan 3-1 gas field is the first deep sea gas field in China and will begin production in 2013.

Severn Trent De Nora will be supplying the SEACLOR® 23 kg/hr seawater electrochlorination system and the OMNIPURE™ Series 55 sewage treatment system, which is capable of treating up to 38,153 liters/day. Process water used on the rig requires disinfection treatment to alleviate biofouling concerns. In addition, a sewage treatment system is required to safely and effectively treat the black and gray water produced onboard.

The SEACLOR system utilizes a proven electrolytic treatment process to generate a sodium hypochlorite disinfectant solution on site using only electricity and seawater. When injected into the cooling water circuits of deep sea gas production facilities, the on-site-generated solution prevents biofouling and marine growth in order to protect the equipment.

OMNIPURE Series 55 sewage treatment systems are the only marine sewage treatment systems that oxidize sewage in an electrochemical cell as well as generate sodium hypochlorite for the disinfection of the sewage streams. The OMNIPURE Series 55 systems offer effective electrolytic treatment of both black and gray water while providing a safe and sanitary method of handling solids. The systems have received Bureau Veritas certification for IMO Resolution MEPC.159(55) and USCG Certificate of Approval to MEPC.159(55).