发布时间：2015-06-06
In 36 major cities, Beijing regeneration highest water use efficiency, up to 60% "in the" 2013 (seventh) Environmental Technology Forum "- on municipal wastewater and new sources of water depth forum, China Water Association Drainage Committee, former Yangxiang Ping, general manager of Beijing drainage Group noted that as a large city, along with economic development, within the limits of 4.5 billion total annual water consumption of Beijing in addition to rainwater harvesting and water diversion outside, the compensation approach is to fully utilize water resources recycled water. By 2015, Beijing regeneration water treatment capacity will reach 5.13 million tons / day.
A variety of treatment processes guarantee reclaimed water quality
Reclaimed water as an important measure to relieve pressure on water resources in Beijing, and its use increased from 2004 year by year, as of 2012 to reach 750 million cubic meters / year, treated effluent basically achieved recycling. Yangxiang Ping said that the key for the Beijing regeneration water treatment technology has three aspects, through the treatment process, Beijing sewage treatment plant upgrade water indicators renovation and infrastructure construction projects to achieve pollutant surface and Beijing Ⅳ class B emissions standard.
First, "Sewage + depth treatment." Including the depth of treatment after disinfection direct supply agricultural methods, as well as in 2000 after the construction of "coagulation sedimentation (iron, aluminum or lime) - Filtration - Disinfection" and "ultrafiltration - 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.
The second is "gray water", mainly for cell dispersion treatment facilities "coagulation sedimentation - filtration - sterilization" and "MBR- Ozone - disinfection" technology.
Third, Beijing also has a dozen tons of water treatment plants, contaminated water after treatment and then returning to another river, the main use "MBR- Ozone - disinfection" technology, and achieved good social and economic benefits.
Yangxiang Ping example introduced renewable water treatment processes typical of Beijing.
Beijing sewage recycling plant using technology
Recycling plant scale (tons / day) process state
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 sedimentation + filtration operation
Qinghe 55 MBR + ozone (15) run
Ultrafiltration + ozone (40) run
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 of processing technology, but water reuse practice is still faced with 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 issues.
Followed by the different users of the water supply schemes vary. Faced with the inner landscape of water, industrial water and other kinds of users, sewage treatment facilities how 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 of safeguards new requirements. When a sewage treatment plant reclaimed water facilities for the future of the security operation put forward 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, renewable security requirements designed to scale to improve water facilities, sewage treatment plants in the past to change the dual-powered model, guarantee stability of operation, in order to meet customer needs.
Fifth, excessive wastewater discharge upstream of the control is more stringent.
Sixth, regeneration and utilization of early rain. Especially during the rainy season a lot of water discharged sewage treatment plants, sewage treatment big impact for subsequent operation and management of recycled water also will be more difficult.
Beijing water for the future development of renewable technology system, Yangxiang Ping pointed out that, to continue to develop and practice a stable, efficient and energy-saving new technology and recycled water processes, strengthen technology targeted depth (nitrogen, phosphorus), running stability and economy Research simplicity and economy of management, the application of the scale, as well as water quality and other aspects of security; at the same time establish a complete renewable water warning technology and regulatory systems.
