真人做人爱试看一

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          There are many problems in sludge disposal situation in Weihe basin

          Author: Taida machine       Release time:2016-08-20
          Reading guidance:Fewer average 55 years according to the relevant statistical data show that in 2011 the Weihe River Basin in Guanzhong section 55 of urban sewage treatment plant sludge generated 41.6 million T (accord
              Fewer average 55 years according to the relevant statistical data show that in 2011 the Weihe River Basin in Guanzhong section 55 of urban sewage treatment plant sludge generated 41.6 million T (according to the moisture content of 80% of the total, average, a ton of waste water and sludge production. 62kg.2011 Xi'an city 14 urban sewage treatment plant sludge generated 25. 9 million T, accounting for about Weihe River Basin in Guanzhong section of town sewage treatment plant sludge volume 62. 1%, Xianyang, Baoji, Weinan, Tongchuan and Yangling District of sludge produced accounted for total sludge volume ratio is relatively small, the main reason has two aspects: one is the urban sewage treatment plant sewage treatment capacity is small; the second is the town sewage treatment plant.
              Weihe River in Guanzhong 55 seat town sewage treatment plant a total water inlet in industrial waste water accounted for about 8. 4%, and Baoji and Xianyang proportion of industrial waste water is large (19. 5% and 24%, respectively). The sludge can be roughly divided into grid slag, sand sedimentation tank sludge, primary sludge, residual sludge, etc.. Guanzhong segment of Weihe River Basin 55 seat town sewage treatment plant in primary settling sludge production and excess sludge production accounted for the vast majority of the total sludge yield ratio. In the primary settling sludge and waste activated sludge from the total amount of primary settling sludge accounted for about 29%, surplus sludge volume accounted for 71%. The treated sludge or sludge products in the environment or use process to achieve long-term stability, and on human health and the environment does not produce harmful effects of final consumption satisfied way called for sludge disposal. At present, sludge disposal technology mainly includes sanitary landfill, land use, sludge incineration, the use of building materials. At present of Weihe River Basin in Guanzhong 55 urban sewage processing plant relates to sludge disposal technology mainly sanitary landfill and land use.
               Weihe River in Guanzhong 55 seat town sewage treatment plant in about 68% of urban sewage treatment plant after the sludge pretreatment (dehydration), sanitary landfill. Due to the disposal methods of sludge disposal method.
               In China at present there is no relevant standards in sanitary landfill sludge moisture content to make mandatory provisions, but due to the moisture content of the higher sludge directly into the sanitary landfill will cause a lot of problems, such as near the pollution of surface and underground water, sludge compaction machinery operation difficulty increases, the deformation of sludge of sanitary landfill field security threats increase, so with the our country of sanitary landfill approach material requirements continue to increase, the future will be on the approach of sludge water rate is made mandatory limit. At the same time, there have been a few towns sewage treatment plant reflecting some sanitary landfill began to receive moisture content high sludge.
              There are about 55 towns in Guanzhong region of the Weihe River Basin sewage treatment plant in 32% urban sewage treatment plants in the pretreatment of sludge (dehydration) after the land use, the urban sewage treatment plant in the land utilization of sewage sludge technology: there are roughly 4 routes: (the urban sludge dehydration the sewage treatment plant), production of earthworm vermicompost (earthworm farms), vermicompost land use (nursery, garden greening units, local farmers etc.); technical route two: sludge dehydration (sewage treatment plant), natural drying dry sludge (sewage treatment plant), dry sludge for land (by local farmers); technical route three: sludge dehydration(sewage treatment plant), sludge (aerobic fermentation of urban sewage treatment plants, composting, enterprises) after fermentation sludge used for soil Land use (nursery, landscaping units, local farmers, etc.); technical route four: sludge concentration and dehydration (urban sewage treatment plant), sludge for land use (local farmers).
              There existed some shortcomings (such as the fate of the four technical route include agricultural land, and heavy metals on the food chain system security threat is still limit the biggest obstacle to the land utilization of sewage sludge in according to < urban sewage treatment plant sludge treatment disposal technology guidelines (for Trial Implementation)  and  urban sewage treatment plant sludge treatment and disposal best available technologies of pollution prevention and control guidelines (for Trial Implementation) related land use conditions and application, the above four pollution soil using technical route; in addition, the technical route without using any harmless and stabilization measures), in practice to be continuously improved and perfected.
              At present, China's urban sewage processing plant sludge land use scope and scale is still very limited, limit the use of is a major factor in the toxic heavy metals may eventually enter the food chain, thus affecting the safety of mankind and the whole ecosystem. Reduce urban sewage treatment plant in the proportion of industrial waste water in the water source is to expand the land utilization of sewage sludge and improve the effective way of land utilization of sewage sludge volume.  
           
           
             

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          真人做人爱试看一

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