News | October 23, 2014

Xylem Supplies Multiple Wastewater Treatment Denitrification Systems In China

Source: Leopold -- A Xylem Brand
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Xylem Inc., a leading global water technology company dedicated to solving the world’s most challenging water issues, has supplied wastewater treatment denitrification systems to three wastewater treatment plants in eastern China as part of a national strategy to improve wastewater treatment by 90 percent over five years. Xylem’s Leopold elimi-NITE denitrification system will significantly support the improvement of wastewater quality for approximately ten million inhabitants in three provinces in the region, enabling plant operators to exceed national water effluent regulations.*

The World Health Organization estimates that nearly 100,000 people die annually from water pollution-related illnesses in China and 75 percent of disease is linked to poor water quality.** The installation of these Xylem solutions is part of a significant programme involving the construction of 1,200 new municipal wastewater treatment plants and approximately 160,000 kilometres of new piping.

Xylem’s Leopold elimi-NITE system, incorporating Xylem’s Leopold Type S Underdrain and FilterWorx Control System, is already operational at the Jingkaiqu Third Wastewater Treatment Plant in Hefei, the capital of the Anhui Province. Treating 100,000 tonnes of wastewater per day, this is one of the most important plants in the region. The Yangzhou Liuwei Wastewater Treatment Plant in Jiangsu Province, where Xylem has also provided denitrification technology, is situated at the centre of the densely populated Yangzhou metropolitan area and plays a vital role in treating effluent from the surrounding cities. The third installation at the Jingjiang Huahui City Wastewater Treatment Plant in the Jiangsu Province is also situated in a heavily populated region.

Discharge from wastewater treatment plants frequently contains high levels of nutrients which feed algae blooms. The Leopold elimi-NITE system uses a patented process control programme which harnesses the advantages of deep-bed, mono-media filters to remove nutrients in the wastewater by converting nitrate-nitrogen to harmless nitrogen gas, leading to reduced impact on aquatic life. It also removes phosphorus and total suspended solids (TSS) from wastewater. In addition, the system is engineered for use in plants where space is limited, as is the case with these plants.

“China is currently embarking on a programme of improving wastewater quality and Xylem is in a strong position to support this effort. Our advanced wastewater solution, the first application of the Leopold denitrification filter process in eastern China, will enhance people’s living standards as well as provide a sustainable wastewater system that will benefit the local environment,” explained Steve Scheidler, business director of Xylem Leopold.

In addition to its environmental benefits, the Leopold elimi-NITE denitrification system is a highly cost effective solution. The system uses a patented process during denitrification which reduces operational costs by increasing the filter run time. A patented methanol feed system further reduces operational costs by optimising methanol dosing while maintaining effluent requirements.

* Chinese Environmental Quality Standard for Surface Water (GB3838-2002).
**Pacific Environment organisation

About Xylem
Xylem (XYL) is a leading global water technology provider, enabling customers to transport, treat, test and efficiently use water in public utility, residential and commercial building services, industrial and agricultural settings. The company does business in more than 150 countries through a number of market-leading product brands, and its people bring broad applications expertise with a strong focus on finding local solutions to the world’s most challenging water and wastewater problems. Xylem is headquartered in Rye Brook, N.Y., with 2013 revenues of $3.8B and more than 12,500 employees worldwide. Xylem was named to the Dow Jones Sustainability Index for the last three years for advancing sustainable business practices and solutions worldwide.

The name Xylem is derived from classical Greek and is the tissue that transports water in plants, highlighting the engineering efficiency of our water-centric business by linking it with the best water transportation of all -- that which occurs in nature. For more information, visit

Xylem’s Leopold elimi-NITE denitrification system is particularly effective when nitrogen is predominantly in the form of nitrate, as is the case with these plants. The system reduces nitrate levels to less than 1.0 milligram per litre. In addition, the system removes suspended solids, including precipitated phosphorous, eliminating the need for downstream filtration or clarification units required of other denitrification systems. In the case of the Hefei plant, the system will reduce Total Suspended Solids (TSS) in the wastewater to less than 5.0 milligrams per litre and total phosphorus will fall to less than 0.3 milligrams per litre. Biological Oxygen Demand will be lowered to less than 10 milligrams per litre.

SOURCE: Leopold -- A Xylem Brand