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Core Technology
Core technology
Advanced water treatment and reuse technology

Updatetime:2015-03-18 Click:

      According to the degree of secondary treatment of urban wastewater purification technology, generally the treated water also contains a significant amount of pollution. It can generate eutrophication if discharged into lakes, reservoirs and other slow-flow water. The water also isn’t suitable for reuse. To achieve the above objective, it need to advanced treatment which has the MBR, BAF and advanced oxidation.    
      1. Membrane bioreactor (MBR) is a relatively new sewage processing technology which is the combination of membrane separation technology and biological treatment process. The membrane module of MBR can retain all the creatures of sewage in the reactor, and remove organics from wastewater in the long sludge age and high suspended solid concentrations. Membrane used for MBR includes microfiltration membrane and ultrafiltration membrane.
      MBR technology mainly used in urban sewage treatment, purification and recycling, in combination with other methods can also deal with specific industries of highly concentrated organic wastewater. Suspended solids and turbidity in the treated effluent is close to zero, and the water quality is good and stable.
      Due to its ability to automatically control, easy operation and management, simple to reform of old technique, MBR have widely used in many countries, a number of cities and multiple water treatment field. 
      2. Biological aerated filters (BAF) is a new development of biological wastewater treatment technology in recent years. It is one kind of sewage treatment facilities which combined biodegradable and solid-liquid separation in one body. It combined the biological oxidation and filtration technology with no sedimentation tanks. It was through the backwash regeneration to achieve period operation of the fite.                                        
      The main features of BAF technology are as follows. Firstly, one-time investment is 1/4 times less than traditional method. Secondly, the covering area is 1/10~1/5 of the normal process covers and less 1/5 times operating costs. Thirdly, the effluent quality is good which can achieve Reclaimed Water Quality Standards or Miscellaneous Domestic Water Quality Standards. Fourthly, filtering speed is high and the processing load is much higher than conventional treatment process. Fifthly, Impact resistant capability is strong and subjected to small affect to climate, water quantity and water quality, particularly suitable for cold weather areas. It could operate intermittently. Sixthly, it can be built as closed plant to reduce the influence of odor, noise on the surroundings and to get good effect in visual sense. Seventhly, it is convenience to operate and management and ease of maintenance. Eighthly, all modular structure could facilitate post-renovation and expansion.
      BAF can be used in eutrophication, sewage, municipal sewage, domestic miscellaneous drainage, food processing, brewing, chemical, pharmaceutical, printing and dyeing and other biodegradable sewage and wastewater.
      3. Advanced oxidation technology of wastewater developed in recent years refers to wet air oxidation, catalytic oxidation, supercritical water oxidation and photochemical oxidation, which aim at the organics difficult to biodegrade in wastewater. It is a series of new technology using the super oxidative of oxygen-based oxidants under artificial special conditions to completely damage and decompose organic pollutants. It biggest characteristic is of widely use, high efficiency, responsive, small secondary pollution, recyclable energy and useful materials. The development and application of these new technologies is of great significance for a rich wastewater especially nonbiodegradable organic-rich wastewater. 
 (1)Chlorine dioxide oxidation 
      Chlorine dioxide is extremely effective oxidation disinfectant, whose ability to kill bacteria, viruses and fungi spore is very strong. The principle of chlorine dioxide to kill micro-organisms is as follows. Chlorine dioxide could better adsorb and through the cell walls, then could be effective to oxide the enzyme including sulfydry in cells. It can react with cysteine, tryptophan and free fatty acid and control biological protein synthesis rapidly to increase permeability of the membrane. It can also change the capsid protein and cause virus inactivated.
      The oxidation decoloring mechanism of chlorine dioxide is generated by releasing atomic chlorine and hypochlorous acid to decompose pigment.
 (2)Fenton chemical oxidation processing technology
      The main principle of Fenton chemical oxidation is that Fenton pharmacy which contains the oxidant H2O2 and catalyst Fe2+ generate hydroxyl radicals (OH·) at the appropriate pH(generally 2-3). The hydroxyl radical could react with organic matter in wastewater to reduce refractory organics.  Fenton method has incomparable advantages with general chemical oxidation in treatment of organic wastewater. It has been successfully applied in a variety of industrial wastewater treatment.