Industrial wastewater differs from municipal wastewater and requires different treatment approaches and processes. Carlo Zaffaroni will present on emerging technologies for wastewater treatment in the industrial sector during Singapore International Water Week, June 1-5.

By: Dr. Carlo Zaffaroni, CH2M HILL Industrial Water and Process Director—Europe

Carlo Zaffaroni will be presenting his paper, “Wastewater treatment challenges faced by the petrochemical and refinery industry and opportunities for water reuse,” co-authored by CH2M HILL’s Dr. Glen Daigger, Peter Nicol, and Tuck Wai Lee, on Wednesday, June 4 at 11 a.m. during the Singapore International Water Week (SIWW). He will also give a preview of this presentation on Tuesday, June 3 at 10 a.m. in the CH2M HILL Booth #J16.

Get the complete schedule of CH2M HILL’s participation in SIWW.

Industrial wastewater differs from municipal wastewater and requires different treatment approaches and processes, as refinery, chemical, and petrochemical wastewaters typically contain a variety of pollutants that require specialized treatment for removal. Due to increasingly stringent regulatory limits for discharge, many wastewater treatment plants are turning to available technologies and upgrading their existing facilities to accommodate industrial wastewaters.

A case study with one of our clients, Bahrain Petroleum Company (BAPCO), demonstrates how integrating wastewater treatment plants into existing wastewater management and re-use systems at BAPCO’s refinery can solve some of the most complex challenges associated with treating industrial wastewater.

BAPCO incorporated a $120 million wastewater treatment facility, which treats 24,000 m3/d of secondary wastewater, at the Bahrain Refinery in Sitra, located on the east coast of the main island of Bahrain. The refinery includes primary treatment facilities for process wastewater; oily wastewater is collected from process units and tank farms and stored in the Oily Water Sewer system, before being routed to oil water separators and further treated prior to being discharged into the Bahrain Sea.

In 2006, BAPCO began testing the refinery wastewater for secondary treatment and determined biological treatment would be necessary to meet the Bahrain Supreme Council for the Environment’s projected future wastewater treatment requirements. Although biological treatment of refinery wastewaters is a common practice, BAPCO’s wastewater presented several challenges including stringent discharge limits, especially for nitrogen; high salinity and temperature of the wastewater; and low degradable organic carbon concentration.

BAPCO enlisted the help of CH2M HILL to conduct a pilot testing phase in order to characterize the wastewater influent streams and to assess the performance of the membrane biological reactor (MBR) process. Results from the study were used to design the four-stage MBR process to treat water to industrial reuse standards—meeting the very stringent nitrogen and phosphorous discharge limits. The plant also includes an innovative double stage cooling of wastewater from 48 to 35°C, and the green and sustainable reuse of the spent caustic as a source of nutrients for the biomass. Reducing the use of brackish water and the volume of water discharged to the sea, as well as increasing water reuse for cooling towers was a priority of BAPCO’s.

BAPCO is the first refinery in the world with a plant that includes optimized process design based on the MBR system. The project has earned BAPCO recognition for being a leader in sustainability and environmental innovation—receiving an Award of Distinction for the Industrial Project of the Year at the Global Water Awards Summit in Paris, as well as the MEED Quality Project of the Year Award and the Sustainable Project of the Year Award.

We look forward to continuing our relationship with BAPCO by providing operations and maintenance on the WWTP for the next five years.

Dr. Carlo Zaffaroni, a senior principal technologist, serves as CH2M HILL’s Director for Europe and is the Technology Leader for MENAI, leading the industrial water and wastewater business. He joined CH2M HILL in 2005 and was responsible for developing the industrial sector of water and wastewater treatment in Italy Europe and MENA. In his current role, Carlo works with local and international clients, especially in the oil & gas and chemical sector to solve their water/wastewater challenges with a process-focused and integrated approach. Prior to joining CH2M HILL, Dr. Zaffaroni was Manager for Process, Technology, and Project Management at Pianimpianti-Lurgi a major Italian company specializing in turnkey design/construction of industrial treatment processes/systems, as well as waste-to-energy systems.