Reading guidance：Our country is still among one of developing countries. We still emphasize much on agriculture. Therefore, there are three methods for disposal sludge: used as fertilizer and modifying agent for farm l

    Our country is still among one of developing countries. We still emphasize much on agriculture. Therefore, there are three methods for disposal sludge: used as fertilizer and modifying agent for farm land or forest, grass, municipal greening seedling breeding base. Sludge is rich in nutrient matters such as nitrogen and phosphorus which can reduce soil density and promote the formation of micro aggregate. These nutrient matters can also improve the composition, performance, porosity, water conductivity and structure of soil. The effect of sludge utilization is to improve moisture content and water-holding capacity of sludge soil.
Utilization of forest and greening
    In addition to agricultural sludge, sludge is also widely used in agriculture. Sludge can also be used for the improvement of forest soil, because sludge contains abundant nutrients and trace elements which can supply nutrients in forest soil, enhance the soil fertility and improve the growth condition of trees.
    At the same time, if apply fertilizers made from sludge, lawn soil endothermic, water absorption and water retention and heat preservation ability will be increased due to the performance of sludge.  Accordingly, the grass germination rate gets increased. Xue Chengze and some other researchers, aiming at the application of expressway greening belt composite composting made from combination of sewage sludge and straw on express highway, in use can be proved for soil improvement with obvious fertile field and, in application in the highway to the green belt of the test point out that by taking advantage of high organic content in compound fertilizers which can improve of fertilizer land and land soil. In the test of express highway, it is proved that sludge can promote the growth of trees and lawns.
    With the development of sludge research and test, sludge will be applied to garden greening, forest, grass, express highway isolation strip, municipal greening, seedling breed, golf course and lawn. The application of sludge will provide a better living environment for human.
 Land restoration and sludge’s function
     Land restoration can be fulfilled by taking advantage of chemical quality and compositions of sludge. Land restoration is mainly applied to land which has been damaged severely in order to change the quality and composition of land.
    Land which has been damaged severely refers to residual mine field, waste pits, forest cutting field, garbage landfill site and land whose surfaces have been damaged severely. These lands, owing to destruction of surface layer, have lost good qualities. These lands are not suitable for planting trees and grass. But we can apply sludge, which can not only add nutrients of soil, but also can promote the growth of plants. In addition, this method avoid food chain process and leads to less threaten to human’s life. This disposal method can not only well dispose sludge, but also can restore ecological environment. Obviously, it is a good application worth of advocating.
    In the restoring system of mining resources, the application of sludge can also be used. It can provide organic carbon for land of mine and improve soil’s fertility in order to improve physicochemical property of waste land and prevent water and soil loss. Using sludge can restore plants of mines rapidly and effectively. It can also increase activity of microorganism waste land. Especially, sludge can be applied to planting area of lead and zinc tailing. The composition of sludge can reduce ZN, PB and CD in tailing matrix. At the same time, it will cause great influence to extraction of DTPA. In this way, it can affect plants on absorption and accumulation of Zn, Pb and Cd. It is beneficial for restoration of land.
Sludge applied to farm land as fertilizer
    When municipal sludge is used as fertilizer,  there are some pollutant matter contained in sludge such as the heavy metal ions, organic pollutants, bacteria, virus and worm eggs. If the content of these harmful matter is high, sludge will influence to environment. As a result, these matters should be controlled at a proper range. After harmless and stable disposal for sludge by using chemical or physical methods, the sludge should meet existing agricultural regulations and rules of local or state government.
     It is demonstrated in results of sewage and sludge survey in china. With the development of economy and market, the tertiary industry in china gets rapidly developed. the proportion of daily sewage accounts more and more in total sludge amount. Owing to the increase of daily sludge, the content of P, N and other organic matters get continuously increased. In this way, sludge can be disposed into fertilizers. Therefore, compared with conventional sludge landfill process and incineration disposal process, this disposal process is a more proper way.
    Although sludge will cause pollution to environment, sludge is also a kind of resources. As long as it is disposed properly, the pollution caused by harmful matters in sludge can be controlled. So, it is advised by experts that relevant departments should draft pollution control plans which should include following information: carry out plans and measures of industrial clean for sludge production factories; control pollution emission well of sludge factories; improve the sludge disposal technology and management; strengthen research on disposal technology and effective use of measures in order to reduce harmful matters contained in sludge and protect safety of public.
     While carrying out land use of sludge, sludge disposal should be paid much attention to. Only when the harmless and stable aims for sludge disposal are achieved, sludge can be applied to land. Zhenghzou taida drying equipment co,. Ltd is a company which specializes in sludge disposal.
 

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