Reading guidance：Sludge landfill disposal due to projects by the local land prices continue to rise and the landfill field the difficulty of site selection effects, for the disposal of the sludge has received certain e

    Sludge landfill disposal due to projects by the local land prices continue to rise and the landfill field the difficulty of site selection effects, for the disposal of the sludge has received certain effect. At the same time, according to the relevant data shows, the landfill disposal of sludge also has certain risk of pollution, through landfill, sludge containing heavy metals and other toxic and harmful substances may into the soil, thus contaminating the groundwater. At present, sludge landfill disposal in China in the sludge disposal occupies a larger share, but there are also many problems.
   At present, some cities in our country will be treated sewage treatment plant sewage sludge city municipal solid waste disposal in a landfill, which has many problems.
  1. Problem of management mechanism
   At present, some cities in our country will be treated sewage treatment plant sewage sludge from municipal solid waste disposal in a landfill, garbage transfer station and landfill field distribution, design and investment is referring to < urban environmental sanitation facilities set standard > (cjj27) and other provisions, belonging to the management of environmental sanitation bureau, while the sewage treatment plant sludge treatment of municipal management system, design the waste landfill age and distribution distance did not consider to accept the sewage treatment plant sludge. Therefore, such as sewage treatment plant sludge city garbage to a landfill, transportation and management costs will increase. Has many problems.
  2. High moisture content of dehydrated sludge
   The sludge is transported to the landfill, the water content is not greater than 30%, and the water content of the sludge in the sewage treatment plant is from 80% to 70%.
  3. Influence normal running of landfill field
  Because landfill sludge bentonite and the strong water, low permeability, low shear strength, friction angle of close to zero, cohesion generally less than 20 kpa. if the landfill into artificial marsh, the subsequent landfill operation is unable to proceed, affecting landfill of normal operation.
  4. Process amount of percolate and increased cost
  Due to the sludge dehydration of fine particles, easily blocked leachate collection and drainage pipes, in the landfill area accumulated a large quantity of leachate and cleaning dredging costs will be greatly increased.
  5. Process amount of sludge buried reduced
  The national standard of mixed landfill, landfill sludge mixed with domestic waste ratio should not exceed 8%. Therefore, the mixing and landfill will affect the amount of sludge landfill disposal. Due to the dehydration of the sludge with rheological properties of the landfill body is easy to be deformed, landslide, becoming human "swamp", will bring a great security risk to the field. In addition, dehydration sludge with high moisture content and high viscosity, will also cause landfill to compaction leads to waste transport vehicles, bulldozers, excavators and other slip, car depression, resulting in difficult operation of the landfill.
  Sludge landfill field should take necessary anti-seepage engineering measures to prevent pollution of groundwater. Due to leachate processing standards more stringent, processing costs also on the rise; at the same time view of the city with the price and landfill environmental problems, the treatment of urban sewage plant near for sludge sanitary landfill site will be less and less.
 
 

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