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Beijing wastewater reuse of technical challenges

Publish Time:2015-2-2

"In the 36 major cities in the country, Beijing regeneration highest water use efficiency, up to 60%" in the "2013 (seventh) Environmental Technology Forum" - the municipal sewage water depth with the new forum, China Water Association Drainage Committee, former general manager of Beijing Drainage Group Yangxiang Ping pointed out that as a big city, along with economic development, within the limits of the total annual water consumption of 4.5 billion, Beijing in addition to rainwater harvesting and water diversion outside, the way water is fully compensated use of recycled water. 2015, Beijing regeneration treatment capacity will reach 5.13 million tons / day.
Various treatment processes to protect the water quality of reclaimed water
Recycled water as an important measure to relieve pressure on water resources in Beijing, and its use increased from the beginning of year 2004, as of 2012 reached 750 million m3 / year, treated effluent basically have achieved recycling. Yangxiang Ping said, mainly for Beijing renewable water treatment technology has three aspects, through these treatment processes, Beijing sewage treatment plant upgrade water facilities construction and renovation project targets to reach surface contaminants and Beijing Ⅳ class B emissions class standards.
First, "Sewage + advanced treatment." Including advanced treatment after disinfection direct supply agricultural methods, as well as in 2000 after the construction of the "coagulation and sedimentation (iron, aluminum or lime) - Filtration - Disinfection" and "UF - activated carbon adsorption - ozone - sterilization" process, ; recently carried out a large scale are the "BAF - or ultrafiltration - Disinfection" (1 + 1 mode) or "MBR- ozone - sterilization" (one-step) process, the most important of these processes is to meet recycling of water.
Second, the "gray water", mainly used for residential treatment facilities dispersed "coagulation sedimentation - filtration - sterilization" and "MBR- ozone - disinfection" technology.
Third, Beijing also has a dozen tons of water treatment plants, water contamination after processing and then returning to another river, the main use "MBR- ozone - disinfection" technology, and achieved good social and economic benefits.
Yang Xiangping example describes the treatment process typical recycling plant in Beijing.
Beijing wastewater recycling plant using technology
Recycling plant size (tons / day) process status
Gaobeidian 100 UF + ozone under construction
Xiaohongmen 60 UF + ozone under construction
Chia Village 8 BAF + ozone under construction
Marco Polo Bridge 10 BAF + ozone run
North Creek 10 MBR + ozone run
Fangzhuang 0.3 Lime Coagulation + filtration run
Qinghe 55 MBR + ozone (15) runs
Ultrafiltration + ozone (40) runs
Development of a number of technical challenges restricting trade promotion
Yangxiang Ping said that despite Beijing's renewable water conservancy amount increases every year, has formed a variety processing technology, but the practice of wastewater reuse is still facing a number of technical challenges.
The first is the transformation of the High-quality recycled water caused by heavy demand. Beijing due to the lack of water, all of the sewage treatment plant to be transformed into a recycling plant, which have led to a large-scale transformation problems.
Followed by different users different water supply scheme. Faced with the inner landscape of water, industrial water and so many users, sewage treatment facilities how to implement renewable water supply? "This will include network planning and water management, including a complex water system," said Yang Xiangping.
Third, the regenerative operation of water facilities safeguards new requirements. When the sewage treatment plant for the future transformation of reclaimed water facilities, running protection raised new demands: that is, to protect the stability of the water supply needs of the user, not because of changes in runoff and intermittent water supply.
Fourth scale renewable safety design requirements for water infrastructure improvement, sewage treatment plants in the past to change the dual-powered model to ensure stability of operation, in order to meet customer needs.
Fifth, excessive wastewater discharge upstream control more stringent.
Sixth, regeneration and utilization of rainwater. Especially during the rainy season a lot of water discharged sewage treatment plants, sewage treatment for a big impact, subsequent operation and management of reclaimed water also will be more difficult.
Beijing for the future development of renewable water technology systems, Yangxiang Ping pointed out, we must continue to develop and practice a stable, efficient, energy-saving new technology and recycled water processes, strengthen targeted depth technology (nitrogen, phosphorus), running stability and economy Research simplicity and economy management, application size, as well as water quality and other aspects of security; at the same time establish a sound early warning technology and recycled water monitoring system.