Biological treatment technology is the use of microbial adsorption, oxidation and decomposition of organic matter in sewage treatment methods, including aerobic biological treatment and anaerobic biological treatment. In water use more aerobic biological treatment technologies, including activated sludge process, contact oxidation method, rotating biological and other treatment methods. These methods or alone, or some combination of biological treatment methods, such as contact oxidation + biological filter; bio-filter + activated carbon adsorption; dial sand filtration and other processes. But as the center of the biological treatment process of the following drawbacks: 1) The sedimentation tank solid-liquid separation efficiency is not high, difficult to maintain the aeration tanks to a higher concentration of the sludge, resulting in low volume load handling devices, covers an area large; 2 ) Efficiency of the treated effluent by sedimentation, water quality is not ideal, and instability; 3) low oxygen transfer efficiency, high energy consumption; 4), sludge yield, sludge disposal costs; 5) managing complex operation; 6) resistance Water quality, quantity and toxic shock load capacity very weak, unstable operation.

 Based on physical chemical coagulation (flotation) technology and the combination of activated carbon as the basic way, compared with the conventional secondary treatment, improved water quality. However, large amount of sludge produced coagulation technology, the high cost of sludge disposal. Although activated carbon in water reuse in the application of more extensive, but with the increased water pollution and increasing the amount of sewage back, its application will be limited.

Therefore, in an efficient, practical, adjustable, energy saving and simple process known membrane technology came into being.
 Membrane separation technologies include microfiltration, nanofiltration, ultrafiltration, dialysis, reverse osmosis, electrodialysis, gas separation, and its to good effect, low energy consumption, small footprint, easy operation and management characteristics and much attention. Microfiltration can remove the sediment can not be removed, including bacteria, viruses, including suspended solids, but also phosphorus; ultrafiltration has been used to remove humic acid and other macromolecules; reverse osmosis has been used to reduce salinity and Removal of total dissolved solids (T DS); use of reverse osmosis for the secondary effluent from municipal sewage treatment plants more than 90% of desalination, water recycling rate of 75%, COD and BOD removal rate of 85% (UF> 50%), more than 90% removal of bacteria, the nitrogen compounds, chlorides and phosphorus removal is also relatively good performance; nanofiltration reverse osmosis and ultrafiltration range between the working pressure of 015 ~ 1MPa, can intercept more than 200 to 400 dalton molecule, water production is large, such as 827 kPa and up to 1 020 L / (m2? d).Nano-filtration can remove all viruses, bacteria and parasites, while dramatically reducing the dissolved organic matter (disinfection by-product precursors), it can be THMs (trihalomethanes) and HAAs (Haloacetic Acids substances) precursor Removal of 90%, 85% hardness removal of 95%, a value greater than 70% of the ion removal rate (operating pressure of 482 ~ 689 kPa), the reduction in the softened water while dissolved solids, low voltage and high water makes the nano-filtration Greatly reduced running costs. To reduce the disinfection by-products and dissolved organic carbon, nano-filtration than traditional treatment and the use of ozone plus activated carbon is more expensive.

Membrane separation technology can be seen in terms of dealing with water or from the economic aspects of water reuse will have a profound impact on development.

 Efficient in water treatment equipment:

 Description: Water is a precious resource, with the rapid development of the four modernizations, the people's living standards, increasing the amount of water, many water resources has become increasingly tense and water shortages have become common in many major cities in the world today Issues, develop small and medium sized water treatment technology to achieve on-demand on urban water quality, quality of water supply, the water quality standards and the intended use of the water. Full use of urban small and medium water resources, urban water supply can ease the tension, the device sets water-saving, energy saving, pollution control one, is ideal for today's pollution control dealing with one of the devices.

 Process Description:
    (1) Hair Aggregator: can remove large suspended solids, played the role of pretreatment to ensure the normal operation of the follow-up device, the device can be cleaned regularly, easy to operate;
    (2) Adjusting the aeration tank: the bottom of the head with aeration, water regulation play, both of water, cooling deodorant, and other training activities of microorganisms in water, can effectively remove more than 20% BOD5;
   (3) Contact oxidation tank: tank equipped with a new packing, on the inflow load, changes in environmental conditions have a greater ability to adapt the scope, is operating normally, no need to align the amount of sludge and air, due to fall off less sludge, Does not produce the active sludge in the operation of the sludge bulking phenomenon, for low concentration organic wastewater treatment;
   (4) Fast filter: porosity, interception ability of the new fiber filter balls, the maximum filtration rate of up to 300m / h;
   (5) Activated carbon adsorber: the device play a role in ensuring water quality, according to the requirements different set of water use;
   (6) In the clear water tank: storage of treated water, so to maintain a certain residence time, so that effective disinfectants to kill microorganisms in water.