真人做人爱试看一

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          Sludge disposal methods at home and abroad

          Author: Taida machine       Release time:2016-08-20
          Reading guidance:Chinas present situation of sludge sludge composition is complex, not only contains large amounts of nitrogen, phosphorus, organic matter and trace elements and other components can be used, also conta
             China's present situation of sludge sludge composition is complex, not only contains large amounts of nitrogen, phosphorus, organic matter and trace elements and other components can be used, also contain toxic, harmful and difficult to degrade organic compounds, heavy metals, pathogens and parasites (eggs) and other substances, and the type of pollutant is more complex, more content the more, if not properly handled, it will cause great harm to the ecological environment and human beings. Therefore, the realization of China's city sludge reduction, harmless and resource has become an imminent task. At present, the methods of sludge treatment and disposal are landfill, incineration, land use, marine disposal and comprehensive utilization of anaerobic digestion and some small scope (including sludge brick, Biochemical Sludge Fiberboard, sludge ceramsite etc.).
             1. Sludge disposal and treatment in foreign countries
             Foreign countries always adopt incineration, sanitary landfill and land utilization. According to our country’s current situation, different areas have different disposal focuses.
            2. Sludge disposal in our country
             our country lags behind on sludge disposal and treatment of sewage disposal. At early time, the production amount of sludge is low and composition is easy. After simple disposal, sludge is utilized as agricultural fertilizer. After 1990s, with the increase of sludge production amount, sludge production is increased sharply. Accordingly, china starts to research on sludge disposals. At present, we have many traditional disposal methods such as landfill and incineration. At present, China's urban sewage treatment plant sludge is mainly dominated by the sanitary landfill, less sludge to compost as fertilizer use. Through the survey showed that, in Fujian Province at present on sludge treatment or in sanitary landfill mainly. Xiamen sewage treatment plant and plant sludge small as landscaping with fertilizer, Xiamen City Xinglin sewage treatment plant sludge compost as fertilizer use, Putian City sewage treatment plant sludge composting and utilization of, the rest of the sewage plant sludge basic into the landfill sanitary landfill.
             3. Treatment of sewage sludge treatment and disposal in China started late, early low sludge production and simple components, later after simple treatment of manure as.20 in 90s, with the increase of the amount of sewage treatment, sludge production surge, China immediately launched a sludge disposal program of research, we have the sludge landfill, land use. Anaerobic digestion and incineration and other traditional disposal methods. At present, the city sewage treatment plant sludge in our country mainly in sanitary landfill, a small part of sludge after composting used as fertilizer. The survey shows that Fujian province is currently processing the sludge or in sanitary landfill. The Xiamen sewage treatment plant and two plant sludge a small amount of urban greening as fertilizer, Xiamen Xinglin sewage treatment plant to produce sludge compost as fertilizer use, Putian city sewage treatment plant is part of the sludge began to enter Row composting of the use of research, and the rest of the sewage sludge generated from the sewage plant is basically entered the landfill.
            3. Disposal and treatment direction
             At present, anaerobic fermentation methods has become a popular disposal methods to dispose sludge. Owing to high moisture content, and organic matter content and emission odor, disposal of sludge is very difficult. Its cost is very high and also will produce secondary pollution.   But the anaerobic fermentation treatment method can improve such properties. Such as improving dewatering characteristics, and can remove organic matter. Part of the sludge treatment by anaerobic fermentation, can produce hydrogen, methane and other energy sources. As the increasing demand for energy and resources, contained in the sludge of a large amount of organic matter and nutrients are it is important to the exploitation and utilization of resources, and the anaerobic fermentation of sewage sludge is the realization of sludge reduction, harmless, resources. The reasonable way of sludge anaerobic fermentation hydrogen production is the main problems of the hydraulic retention time is long, the digestion efficiency is low, the rate limiting step is the hydrolysis process in order to improve the efficiency of anaerobic sludge. Digestion, many scholars put forward the sludge pretreatment, such as heat treatment, acid treatment, ultrasonic treatment, its principle is to make the sludge pretreatment cell wall rupture, cell Organic matter dissolution, dissolution and hydrolysis, thus increasing sludge bio degradation ability and anaerobic digestion and shorten the hydraulic retention time. Lots of tests and literature shows that, the sludge pretreatment processing can not only enhance sludge disintegration effect, improve the sludge in the soluble organic matter composition. At the same time, it can inhibit the activity of methanogens, so as to effectively improve the sludge anaerobic fermentation hydrogen production efficiency.
              With the rate of development and industrial waste water treatment and the improvement of city, city sludge yield more and more inevitable. The sludge disposal method to choose reasonable and effective, should take into account the ecological benefits and economic benefits of environmental disposal costs, the balance between. Sludge is a potential resource utilization value, to make use of the resources, reduce the the pollution of the environment, many foreign countries are moving in the direction of the development of sludge utilization. Compared with other countries, the sludge treatment and disposal technology is still relatively backward, considering that China is a large agricultural country, after fermentation of stabilization, harmless sludge recycle land use, should be in China sludge to achieve an effective way of resource utilization.
           
            
             
           

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          真人做人爱试看一

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