Reading guidance：At present, sludge treatment is mainly achieved by reducing the rate of sludge water. Disposal of sludge mainly rely on sludge sludge landfill and incineration to achieve. However, the methods of treat

    At present, sludge treatment is mainly achieved by reducing the rate of sludge water. Disposal of sludge mainly rely on sludge sludge landfill and incineration to achieve. However, the methods of treatment and disposal of the sludge still exist some shortcomings, the world of technicians and experts and scholars research the new technology to achieve sludge effective treatment and disposal.
Sludge melting
    In order to reduce the volume of sludge and the use of the heavy metal bonding, Japan had carried out sludge melting technology research, but is not very deep. Sludge melting treatment and sludge thermo-chemical processing method of a. Sludge melting technology is the sludge is heated to 1300 to 1500 DEG C, so that the organic matter in the sludge combustion, the residual substances can be used to make glass, iron and steel, building materials and so on.
Two phase digestion
    At present, new sewage sludge treatment process - temperature methanation of two-phase anaerobic digestion to emerge, and gradually be applied. The sewage sludge two-phase anaerobic digestion process, the acid production phase and methanogenic phase are respectively arranged in each reactor, the formation of the respective relative advantages of microbial community, improve the treatment effect of the digestive process and the stability of.VSS (volatile suspended solids) removal rate than in the traditional process of temperature increase more than 50%, than the traditional high temperature process to increase about 35%. High temperature acidification 0.5d, mesophilic methane 8.5d, treatment effect can be achieved in the traditional method of temperature 20d, saving time. In addition, the traditional method is superior in sterilization temperature buffer capacity, methanogenic reactor to maintain a high, volatile acid accumulation and resist strong impact resistance capacity.
Use sludge to make oil  
    Sludge of oil is the moisture content for 65% of the dry mud in under the condition of air isolation, heating 450 DEG C, in the catalyst under the action of the sludge organic matter into hydrocarbons, the maximum conversion rate depending on the sludge composition and catalyst species and normal per ton dry sludge could be changed about the 200~300l oil yield, its nature and diesel is similar to. Pilot tests being carried out in Canada, in Perth, Australia also is built by chemical methods of sludge oil factory.
Wet-type oxidation of sludge
    Wet air oxidation at high temperature (125 DEG C to 320 DEG C) and high pressure (0.5~20mpa) conditions, to the oxygen in the air as the oxidant, in the liquid phase will be organic matter decomposition into carbon dioxide, water and other inorganic or small organic molecules of chemical process. Due to the residual sludge in the material structure and high concentration organic waste water is very similar, so this method can also be used for excess sludge treatment, sludge wet oxidation process is the wet oxidation method is the most successful application areas, currently has more than 50% of wet oxidation device used in sludge treatment.
Reduction of ozone residual sludge
    Sludge digestion and sewage treatment in the same aeration tank at the same time. The process was divided into two stages, one is the ozone oxidation process, the other is the bio degradation process. From two heavy down in a pool of sludge, part directly back into the aeration tank, the other part is the first ozone treatment and then returned to the aeration tank. The sludge after ozone treatment, can improve its biodegradability, in the aeration tank and sewage biological treatment. At the same time and in the ozone treatment, there will be a part of the sludge (1/3) is inorganic. Therefore, as long as the proper operation, can increase the sewage sludge in the process and the amount of inorganic sludge is equal to the amount, which can be reached without surplus sludge.
Use ultrasonic to dispose residual sludge
    Using ultrasonic technology to reduce sludge is very mature in developed countries. At 90s of last century, Germany and other developed countries have installed and applied this kind of technology which provides convenient condition to sludge reduction. In recent years, many researches are based on real condition of sewage disposal plants.     
   Barber and his colleagues regard German Pentax sewage factory ultrasonic treatment facilities as the experimental environment, explored in conditions of full application of ultrasonic treatment on sludge biological and chemical properties. The results show that: after ultrasonic treatment of digested sludge bio gas production have contributed to significant, sludge viscosity decreases with increased by 20% to 50%, sludge hydrolysis performance improves the 3% - 7%, which based on the study of the application of explores the ultrasonic sludge reduction technology in the application, and can be used directly for the improvement of sewage treatment plant of this technology.
High-rate bio-reactor
   It is developed on the basis of utilizing soil to dispose sludge. Take advantage of microbes in soil to dispose sludge; because of open environment, this system will be affected by temperature and soil moisture content, which will make the utilization time and zone restrained.
    SWEC company of the United States in 80s the last century began to research and develop the high-speed bio reactor, the sludge dehydration technology, digestion and dry combination, the whole process will be placed in the indoor soil treatment of a closed circulation system of.Texaco after nearly 20 years of research and development, the high speed bio reactor with mature technology and promote. The core part of the operating system of the biological reactor, it consists of two zones: the upper part is mixed sludge and soil area Domain, the sludge load reaches the homogenization, organic part of the sludge bio degradation in this area; the lower part is a gas and liquid separation, the liquid does not stay in the soil, in order to increase the oxygen transfer rate. High loading rate sludge treatment through the system, the organic component of sludge the degradation of 70% to 80%, the concentration of suspended solids removal rate reached 45% to 60%. directly into the system from the settling tank discharge concentration of 5000~30000mg/l sludge can, without any pretreatment. Compared to other biological treatment technology, the system requires less energy, can be in continuous operation, and can maintain the optimum temperature for microbial the degradation, especially suitable for the limitation of natural conditions or soil moisture in sludge treatment.
 
 

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