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Siemens to provide system for treating FGD scrubber wastewater
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Industry news Filtration+Separation July/August 2009
Flue gas desulphurisation increases in China Chinese suppliers of flue gas desulphurisation systems have installed or have orders for plants with a total electrical capacity of over 500,000 MW. This compares to only 180,000 MW in the US, according to a plant-by-plant analysis by the McIlvaine Chinese Utility Plans database. The research also shows that China is operating 379,000 MW of scrubbers compared to only 130,000 MW in the US. China has these FGD scrubbers on 67% of its coal-fired plants which is a higher percentage than in the US. China is also the largest
supplier of many types of air pollution control equipment and several Chinese companies are the world’s leading suppliers of electrostatic precipitators. In recent years, suppliers of FGD systems have grown rapidly and ten of these companies are among the 20 largest FGD companies in the world. China is the world’s largest cement and steel maker. The McIlvaine report adds that its air pollution investments in these industries are significant and growing. China has embraced the waste-to-energy concept for
Final approval for Carlsbad desalination plant The Carlsbad desalination plant, California’s first large-scale desalination plant, has received final approval from regulators. Known as the Carlsbad desalination project, the plant will produce 50 million gallons of water per day, to be used in San Diego, California. It is thought that the approval for the plant will set a precedent for other desalination plants in California, as water supply and demand continue to be an issue in the state. The Carlsbad project is expected to break ground this year, and be operational in 2012. Scott Maloni of Poseidon Resources, the project’s developer, stated that the issues resolved by the regulators were reached unanimously, as the San Diego Regional Water Quality Control Board voted to approve the desalination plant’s flow, impingement and entrainment minimisation plan. This was a condition to the original permits issued by the Board in 2006. The plan is designed to avoid and/or mitigate the impact to marine life that could occur when the desalination plant is treating more water than is provided by the host power plant.
While there are lessons to be learned from the Carlsbad project, especially relating to the permitting of large-scale seawater desalination plants in the US, Maloni believes that the approval of this plant will not open the floodgates to more desalination plants - rather, every project will have to be developed on a site specific basis and Carlsbad can provide a road map for how to develop these projects. As part of the coastal development permit from the California Coastal Commission, a voluntary energy minimisation and greenhouse gas reduction plan was developed. This includes offsetting indirect carbon emissions, making the Carlsbad plant the first largescale infrastructure project in California to voluntarily neutralise its net carbon footprint. Poseidon Resources is also involved in permits for a second 50MGD desalination plant in Huntingdon Beach, California. This project is currently running a year behind the Carlsbad plant. www.poseidonresources.com
dealing with municipal garbage and has recently spent more on air pollution equipment for these plants than has the US. Despite a temporary slowdown, the Chinese economy is now gaining momentum. This is in contrast to Europe and the US where the recession continues. The relative size of the Chinese market for each equipment type is included in separate world market reports on fabric filters, electrostatic precipitators, NOx control, air monitoring and FGD. www.mcilvainecompany.com
Flue gas desulphurisation is now being employed widely in China.
Siemens to provide system for treating FGD scrubber wastewater One of the largest power producers in the US has selected Siemens Water Technologies to provide a system to treat wastewater from a Flue Gas Desulphurisation (FGD) scrubber being constructed at a power plant in the eastern US.
limestone-forced-oxidation (LSFO) scrubbers to convert SO2 in the flue gas to gypsum, which can be recycled and sold for wallboard manufacturing, cement additive, or agricultural applications - turning a waste stream into a usable resource.
Siemens Water Technologies explains that the installation of the wet scrubber will significantly reduce emissions of mercury and sulphur dioxide. The wastewater treatment system will remove suspended solids and heavy metals from the scrubber waste stream so the water can be safely discharged. Siemens’ scope of supply on the new physical/chemical wastewater treatment system for this project includes system design, equipment supply, project management, system start-up, staff training, and system commissioning. When completed in 2012, the system will be Siemens’ 14th FGD scrubber wastewater treatment system installed at a US power plant.
The system from Siemens will include an equalisation tank, reaction tank, chemical feed systems, clarifier, gravity sand filters, sludge holding tanks, and recessed chamber filter presses. The equalisation tank receives the waste stream and attenuates the flow to eliminate spikes in flow rates and concentration. The reaction tank’s purpose is to de-saturate the wastewater and prepare the wastewater for clarification. A chemical to enhance flocculation is added to the reaction tank. Next, the wastewater flows to a clarifier in which polymer is added to cause the suspended solids to coagulate and settle. Solids from the clarifier are directed to sludge holding tanks prior to dewatering in the filter presses. The treated water from the clarifiers flows to gravity sand filters for final treatment, and is then ready for discharge.
According to the company, scrubbers are used in numerous US power plants to meet emissions standards set by the US Environmental Protection Agency (EPA) and/or state agencies. Flue gas systems frequently use
www.siemens.com/water
Industry news Filtration+Separation July/August 2009
Flue gas desulphurisation increases in China Chinese suppliers of flue gas desulphurisation systems have installed or have orders for plants with a total electrical capacity of over 500,000 MW. This compares to only 180,000 MW in the US, according to a plant-by-plant analysis by the McIlvaine Chinese Utility Plans database. The research also shows that China is operating 379,000 MW of scrubbers compared to only 130,000 MW in the US. China has these FGD scrubbers on 67% of its coal-fired plants which is a higher percentage than in the US. China is also the largest
supplier of many types of air pollution control equipment and several Chinese companies are the world’s leading suppliers of electrostatic precipitators. In recent years, suppliers of FGD systems have grown rapidly and ten of these companies are among the 20 largest FGD companies in the world. China is the world’s largest cement and steel maker. The McIlvaine report adds that its air pollution investments in these industries are significant and growing. China has embraced the waste-to-energy concept for
Final approval for Carlsbad desalination plant The Carlsbad desalination plant, California’s first large-scale desalination plant, has received final approval from regulators. Known as the Carlsbad desalination project, the plant will produce 50 million gallons of water per day, to be used in San Diego, California. It is thought that the approval for the plant will set a precedent for other desalination plants in California, as water supply and demand continue to be an issue in the state. The Carlsbad project is expected to break ground this year, and be operational in 2012. Scott Maloni of Poseidon Resources, the project’s developer, stated that the issues resolved by the regulators were reached unanimously, as the San Diego Regional Water Quality Control Board voted to approve the desalination plant’s flow, impingement and entrainment minimisation plan. This was a condition to the original permits issued by the Board in 2006. The plan is designed to avoid and/or mitigate the impact to marine life that could occur when the desalination plant is treating more water than is provided by the host power plant.
While there are lessons to be learned from the Carlsbad project, especially relating to the permitting of large-scale seawater desalination plants in the US, Maloni believes that the approval of this plant will not open the floodgates to more desalination plants - rather, every project will have to be developed on a site specific basis and Carlsbad can provide a road map for how to develop these projects. As part of the coastal development permit from the California Coastal Commission, a voluntary energy minimisation and greenhouse gas reduction plan was developed. This includes offsetting indirect carbon emissions, making the Carlsbad plant the first largescale infrastructure project in California to voluntarily neutralise its net carbon footprint. Poseidon Resources is also involved in permits for a second 50MGD desalination plant in Huntingdon Beach, California. This project is currently running a year behind the Carlsbad plant. www.poseidonresources.com
dealing with municipal garbage and has recently spent more on air pollution equipment for these plants than has the US. Despite a temporary slowdown, the Chinese economy is now gaining momentum. This is in contrast to Europe and the US where the recession continues. The relative size of the Chinese market for each equipment type is included in separate world market reports on fabric filters, electrostatic precipitators, NOx control, air monitoring and FGD. www.mcilvainecompany.com
Flue gas desulphurisation is now being employed widely in China.
Siemens to provide system for treating FGD scrubber wastewater One of the largest power producers in the US has selected Siemens Water Technologies to provide a system to treat wastewater from a Flue Gas Desulphurisation (FGD) scrubber being constructed at a power plant in the eastern US.
limestone-forced-oxidation (LSFO) scrubbers to convert SO2 in the flue gas to gypsum, which can be recycled and sold for wallboard manufacturing, cement additive, or agricultural applications - turning a waste stream into a usable resource.
Siemens Water Technologies explains that the installation of the wet scrubber will significantly reduce emissions of mercury and sulphur dioxide. The wastewater treatment system will remove suspended solids and heavy metals from the scrubber waste stream so the water can be safely discharged. Siemens’ scope of supply on the new physical/chemical wastewater treatment system for this project includes system design, equipment supply, project management, system start-up, staff training, and system commissioning. When completed in 2012, the system will be Siemens’ 14th FGD scrubber wastewater treatment system installed at a US power plant.
The system from Siemens will include an equalisation tank, reaction tank, chemical feed systems, clarifier, gravity sand filters, sludge holding tanks, and recessed chamber filter presses. The equalisation tank receives the waste stream and attenuates the flow to eliminate spikes in flow rates and concentration. The reaction tank’s purpose is to de-saturate the wastewater and prepare the wastewater for clarification. A chemical to enhance flocculation is added to the reaction tank. Next, the wastewater flows to a clarifier in which polymer is added to cause the suspended solids to coagulate and settle. Solids from the clarifier are directed to sludge holding tanks prior to dewatering in the filter presses. The treated water from the clarifiers flows to gravity sand filters for final treatment, and is then ready for discharge.
According to the company, scrubbers are used in numerous US power plants to meet emissions standards set by the US Environmental Protection Agency (EPA) and/or state agencies. Flue gas systems frequently use
www.siemens.com/water