Speaking of sewage treatment, it is natural to think of the large urban sewage treatment plant complex
 equipment and all kinds of chemicals, does not know that deal with sewage best way is to use the natural
 elements around us, soil, plants, sand, stone ... with The advanced technology will be the most common
 natural substances combined to form a "clear drainage network. Recently, Fudan University, Department
 of Environmental Science and Engineering, Professor Zheng Forward reporter show he belongs team
invented a "composite tower biofilter sewage treatment device always reflect the natural factors, of its
governance sewage efficacy equivalent three times China's urban sewage treatment plants.Ecological
 physical collaborative water managementZheng is introduced, the composite tower biofilter has built
more than 300 seats, and all over the rural areas of Jiangsu, Henan, Guizhou and other places. In
appearance, these biofilter everybody like a nondescript building, scattered on the field, and its interior
 is quite an art. It is divided into four layers, the top layer is a plant, the second layer is the soil, and
 the third layer of sand, the fourth layer is gravel, soil, there are many animals, including some insects
 and earthworms. Sewage into the system after biological role, especially in the action of microorganisms,
 plants role, the co-processing of biological and ecological physical chemistry, sewage treatment reached
 the magical effect Finally, every drop of water are crystal clear, up to the national two to four standards.
The earth device than foreign equipment"This device is available for the inhabitants of entire villages,"
Zheng is further explained that it is not any management, as long as there is a farmers take care on the
 line, do not let the children to unplug the grass, or damage to water pipes , will be able to operate as
usual; and sewage treatment equipment is integrated into the surrounding countryside. Zheng Zheng
device similar devices with Japan, the United States had a "contest" result set "soil device" is better
than "foreign equipment, water parameters were significantly higher than a chip.Zheng is admitted,
of course, the "composite tower biofilter is not suitable for use in large cities to make the best of it in
the rural areas, more suitable for" growth "in rural areas. According to the National Environmental
Communique, more than 90% of rivers and lakes in China are facing the threat of deterioration of
water quality, pollution control lies the source of governance, and now, in addition to the pollution
caused by the metropolitan industrial pollution, rural life and agricultural production is also important
causes of water pollution.Zheng is heard fertilization of agricultural production per unit area is five
times that of the United States, according to 2012 data, has become an important pollutants. Zheng
Zheng said he hoped that this device can be promoted in rural areas, if each village in the basin of
carrying incoming flow of pollutants to be highly purified, then it is discharged into rivers, lakes, and
will be able to address watershed pollution control problem.Residential district can useZheng is introduced
 at the same time, the composite tower biofilter use some of the new residential district in Shanghai Rural
 If you have not yet sewage pipe, using this equipment.However, with some regret, due to the existence
 of a "vicious circle", low prices but can not enter the market, the inventions of the scientists have not
yet settled on a local, "because the offer was too low in our bidding, cost just others 1/10 this can not
 enter the Shanghai market.