Articles & Case Studies

Siemens to provide a BNR system for improving effluent quality at one of the largest municipal wastewater treatment plants in China

Posted: Friday 5th February 2010

Siemens Water Technologies & Engineering (Tianjin) Co., Ltd. (SWTE) signed a 42 million Renminbi (approx. 4.2 million Euro) contract with Tianjin Capital Environmental Protection Group Co., Ltd. in China (TCEPC) to provide a Biological Nutrient Removal (BNR) system for upgrading and retrofitting the facilities of Tianjin Xianyang Road Wastewater Treatment Plant (Xianyang Road WWTP) in Tianjin, China. The BNR system will be designed to treat 450,000 m3 per day and to significantly improve the effluent discharge standard of Xianyang Road WWTP from the national standard of Class II to Class I. The project is scheduled for start up in April 2010.

The Verticel process is part of the Siemens solution at the Tianjin Xianyang Road Wastewater Treatment Plant.

As one of six main drainage systems in Tianjin, the Xianyang Road WWTP serves an area of 6806 hectares. The WWTP upgrade is one of the key sewage treatment projects for pollution control of the Hai River. The project was awarded to Siemens following a successful BNR pilot study conducted for TCEPC in June 2009. The BNR system uses an aerated anoxic reactor, where simultaneous nitrification and de-nitrification occurs, followed by two aerobic reactors to increase the efficiency of total nitrogen removal when compared to conventional processes. With the BNR process, the biological reaction tank footprint is minimized, and therefore the capital cost is significantly reduced. TCEPC will not need to construct additional basins that otherwise would be required for conventional activated processes. In addition, the dissolved oxygen profile of 0/1/2 mg/l maintained in the three respective reactors greatly reduces oxygen demand, thereby reducing energy usage. The unique “Smart BNR” automation system allows optimal operation of the whole system. Not only can the BNR be easily retrofitted into existing plants, but is also ideal for new plants. Water treatment technologies and solutions are an important feature of Siemens’ environmental portfolio. In 2008, revenue from the products and solutions of Siemens’ environmental portfolio was nearly EUR19 billion, which is equivalent to around a quarter of Siemens’ total revenue. In 2008, Siemens China announced that more than half of its EUR 1 billion mid-term investment will go to energy-saving and environmentally friendly technologies and solutions.

Siemens to provide waste-to-energy wastewater treatment system for Pearl Valley Cheese

Siemens has been awarded the contract to provide process equipment, design and start-up services for a wastewater treatment system at the Pearl Valley Cheese, Inc. production facility in Fresno, Ohio. The system will be designed to convert waste material generated during cheese production into a reusable biogas generated in the wastewater treatment process. This renewable energy approach allows Pearl Valley Cheese to receive a state funding grant, and reduces the amount of natural gas required to operate the facility’s boilers, which are used for providing steam for the cooking, cleaning and pasteurizing processes. The 50,000-gallon-per-day (GPD) (189,000 LPD) system, which will be able to handle a variety of waste streams and still meet effluent requirements, is scheduled for start up in the summer of 2010.

Siemens will provide an influent screen, neutralization equipment, anaerobic contact process (AnCP) reactor, an Agar moving bed reactor (MBBR) for aerobic polishing and a Dystor Biogas Storage system. Pearl Valley Cheese considered other wastewater treatment technologies, but chose Siemens based on its experience, as well as system cost and installation time. The AnCP is a low-rate anaerobic process that incorporates an anaerobic bioreactor and a clarification step in series. The methane gas by-product of anaerobic treatment, with a heat value of approximately 650 BTU/FT2, offers a return on the capital investment in the form of “green” energy. The AnCP is used in conjunction with the Dystor Biogas Storage system, an engineered dual membrane storage technology that provides flexibility in biogas availability to meet the plant’s production demands for energy. The DAF system removes suspended solids, fats/oils/grease and other insoluble materials, and typically produces sludge concentrations several times that of conventional gravity filters. The Agar MBBR process provides for final polishing of wastewater through the use of suspended biomass carriers, which provide a large surface area for biofilm growth, enhancing the biological wastewater treatment process without increasing plant footprint. On this project, Siemens worked closely with its design partner, Applied Technologies (ATI) of Brookfield, Wisconsin, in developing this cost-effective, environmentally sound treatment solution. Pearl Valley Cheese, Inc., of Fresno, Ohio, manufactures a variety of award winning Swiss and Colby style cheeses, distributed to grocers, specialty retail markets in Ohio, West Virginia, Pennsylvania, Maryland, Virginia and Florida

Sinopec selects Siemens wet air oxidation technology for wastewater treatment at two new ethylene facilities

Siemens Water Technologies will provide Zimpro wet air oxidation technology to treat wastewater at Sinopec’s Zhenhai and Tianjin ethylene plant projects in the Zhenhai District, Ningbo, Zhejiang Province, and in Tianjin, China. The systems will be used to treat sulfidic spent caustic wastewater streams generated in the production of ethylene. The energy-efficient wet air oxidation systems will destroy odorous sulfide pollutants and generate a biodegradable effluent that can be discharged to conventional biological wastewater treatment. The Zhenhai system will treat approximately 18.2 m3/hr of wastewater; the Tianjin system will treat 14.5 m3/hr.

Zimpro wet air oxidation system installed in China.

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 process will oxidize odorous reduced sulfur species such as sulfides and mercaptides. The system will also break down complex organic contaminants, such as phenols, to either carbon dioxide and water, or biodegradable organics. The two Sinopec projects are the sixth and seventh spent caustic WAO systems installed in China by Siemens Water Technologies. Sinopec Tianjin Company (TPCC) is a petrochemical complex of oil refining, ethylene, chemical and chemical fiber production. It is located in the District of Tianjin and has 13 oil refining units, eight chemical production units and five chemical fiber units. Annual crude oil handling capability is about 18 million tons. Sinopec Zhenhai Refining & Chemical Company (ZRCC) is the largest base for crude oil processing, for imported crude oil processing and sour crude oil processing, an oil products export base as well as one of the major crude oil distribution bases in China. Zimpro WAO systems are a component of the Siemens environmental portfolio. In 2008, revenue from products and solutions of Siemens’ environmental portfolio was nearly EUR19 billion, which is equivalent to around a quarter of Siemens’ total revenue, making Siemens the largest provider of environmentally friendly technology.

Siemens to equip Jeddah sewage treatment plant with one of largest odor control systems in Saudi Arabia

Siemens Water Technologies will supply a nine-piece odor control system at the 250,000 m3/d North Jeddah Sewage Treatment Plant (STP) in the Kingdom of Saudi Arabia. As the STP is located next to the King Abdullah Aziz Airport in Jeddah, the Ministry of Water and Electricity requested that odor control equipment be installed. Valued at more than US$2 million, the system will consist of three different technologies located at five areas throughout the plant. Once completed by year’s end, this will be one of the largest odor control installations in all of Saudi Arabia.

Multiple technologies allow Siemens to offer the most efficient odor control solution

The Ministry selected Siemens for its odor control experience and number of installations in the Kingdom. Siemens is one of the few bidding companies that was able to provide a multitude of odor control solutions, including a combination of biological, chemical, and activated carbon. Siemens will also guarantee the overall system’s efficiency. Two two-stage bio-trickling filters will remove the bulk of hydrogen sulfide (H2S) in the aerated grit chambers and bio-phosphorus tanks, followed by a LO/PRO two-stage chemical scrubber to reduce overall odors. A three-stage chemical scrubber will remove 99.9% of H2S and other odors in the sludge thickener and tanks area. Three additional scrubbers will be installed in the sludge dewatering building to treat ammonia and amines, H2S, and organic sulfur compounds in three separate stages. A ZABOCS biofiltration unit installed in the return and excess sludge pumping station will remove H2S and various other odorous compounds. A single-stage packed tower chemical scrubber in the aeration tanks rounds out the system, treating a high volume of air and a range of odors and concentrations in a small footprint. For this project, Siemens again teamed up with Riyadh-headquartered project manager Aziz. Siemens Water Technologies has a number of odor control installations in the Kingdom of Saudi Arabia, including a chemical scrubber in Wady Al Dawasir; six carbon systems in Riyadh; seven biological systems and four carbon systems in Dhahran; and two biological systems in Taif.

High quality effluent helps Chinese city to restore water quality in Taihu Lake - Siemens commissions MBR system at Wuxi Xincheng waste water treatment plant

Siemens Water Technologies has commissioned a wastewater treatment system for the Wuxi Xincheng Plant in China´s Jiangsu Province. An upgrade to the existing wastewater treatment plant, the system includes a Siemens advanced Membrane Biological Reactor (MBR) system. It is producing of 30,000 cubic meters per day of high quality effluent that meets or exceeds the national discharge standard of Class I-A, allowing the treated water to be safely discharged to Taihu Lake.

Siemens commissions MBR waste water treatment system at Wuxi Xincheng, China

The MBR system at Wuxi Xincheng integrates the conventional biological treatment process with membrane filtration using Siemens’ Memcor membranes. It can significantly reduce both nitrogen and phosphorus in the treated effluent by breaking down the organic nutrients and filtering the solids. Compared with conventional technology, the MBR system requires about 75% less footprint to install, which is important for existing plants with limited space. The proven MBR technology from Siemens has been applied to more than 70 facilities around the world. Siemens completed this MBR project within 12 months after signing the contract. “I am very proud of our success with the Wuxi Xincheng project,” said Dr. Henrik Alt, General Manager of Siemens Water Technologies in Beijing, China, “More and more existing wastewater treatment plants in China are facing added pressure to meet stricter requirements for water treatment. Our broad portfolio and integrated solutions can help customers meet this challenge.“ Located in the highly developed and densely populated Yangtze River Delta, the Taihu Lake has been increasingly polluted in recent years. As part of its efforts to clean up the Lake, Jiangsu province set out to improve sewage treatment capacities in cities surrounding the lake area. The MBR system will allow the Xincheng plant to better serve over 100 high tech enterprises in the Wuxi New District’s industrial park, which has experienced a 20 to 25 percent annual increase in wastewater. “The availability of enough safe water and the effective treatment of wastewater is an increasingly complex challenge in China,” comments Mr. Tim Dawidowsky, General Manager of Siemens Industry Solutions Division. “As a world leading solutions integrator, we’re committed to contribute not only solutions but more importantly our know-how and expertise to help China realize the goal of sustainable development.” Memcor membrane systems are part of Siemens’ Environmental Portfolio. In fiscal 2009, revenue from the Portfolio totaled about €23 billion, making Siemens the world’s largest supplier of ecofriendly technologies. In the same period, our products and solutions enabled customers to reduce their CO2 emissions by 210 million tons.

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