Wastewater treatment at Indonesia gas processing plant to be enhanced with wet air oxidation system

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Abu Dhabi, Aug. 12, 2013 -- A wet air oxidation system from Siemen Energy is planned to be soon delivered to a gas processing plant in Gundih, Indonesia to treat wastewater contaminated during the gas production process.

The contract between Siemens and Southeast Asia's archipelago was awarded by a consortium consisting of PT Inti Karya Persada Tehnik and PT Adhi Karya (Persero) Tbk. As general contractors, both companies are working together to build the gas processing plant for the end customer, the state-owned Indonesian oil and gas PT Pertamina EP.

The Zimpro wet air oxidation system for spent caustic treatment (Photo courtesy of Siemens)

The Gundih gas processing plant is under construction in Blora in Indonesia's Central Java province. The facility will have a daily gas production capacity of 50 million standard cubic feet (1.4 million standard cubic meters) after start-up at the end of 2013. Siemens' Zimpro wet air oxidation system will treat a mixture of alkaline wastewater and wastewater generated during sulfur recovery by destroying odorous and high chemical oxygen demand (COD) pollutants and generating an effluent that meets the Indonesian environmental regulations for discharge.

Wet oxidation is the oxidation of soluble or suspended components in an aqueous environment using oxygen as the oxidizing agent. When air is used as the source of oxygen, the process is referred to as wet air oxidation (WAO). The system will oxidize odorous reduced sulfur species such as sulfides and mercaptides, and will also break down complex organic contaminants, such as phenols, to either carbon dioxide and water, or biodegradable organics.

"The Gundih project is the first wet air oxidation system that Siemens has delivered to Indonesia," says Mario Azar, Head of the Business Unit Oil & Gas Solutions at Siemens Energy Sector. "Our solution not only offers low energy consumption and minimal maintenance costs, but also features excellent reliability and efficiency."

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