Reading guidance：At present, domestic sludge is the main way to solve is landfill to municipal solid waste (MSW) in landfill due to the sludge into the MSW landfill landfill technology started late, lack of correspondi

    At present, domestic sludge is the main way to solve is landfill to municipal solid waste (MSW) in landfill due to the sludge into the MSW landfill landfill technology started late, lack of corresponding technical support and engineering experience, causing people blind to the height of the sludge and MSW landfill piled higher and higher. The more the gradient fill the steeper the sludge is wantonly poured into the MSW landfill phenomenon also common occurance, resulting in landfill engineering safety hidden clumps, engineering accidents occur frequently. It not only causes the heavy casualties and property losses, to the local brought enormous environmental disaster.
1. Present problems
   The sludge landfill technology, although some beneficial results were obtained, but still failed to solve the key technical problems of sludge landfill fundamentally. Although the above results showed that the sludge and solid waste landfill MSW city is a new idea, can improve the rheological properties of sludge, accelerate and accelerate sludge degradation of landfill stabilization process etc. The advantages, and the sludge and other waste landfill has mixed low compressibility, small settlement and other advantages, compared with the single sludge landfill, landfill has been widely used, but in Hongkong proved that many of China's landfill, has yet to solve many key technical problems of city sludge and solid waste landfill MSW mixed, mixed landfill sludge and garbage is difficult to implement. For the reason, one factor can not be ignored, the research and application of early work Mainly by the chemical environment and the scholars and the staff made, the emphasis of the study is the effect of sewage sludge on the surrounding environment, and directly influenced the sludge landfill operation, to ensure that the considered little sludge landfill safety the following key engineering problems:
  1. Determination of the sludge characteristics and the corresponding sludge MSW landfill height and the slope of the sludge entry, and the determination of the sludge entering the MSW landfill site and its optimization design method;
  2. the influence of sludge characteristics on the way of sludge landfill and the construction method of the sewage sludge entering the MSW landfill site;
  3. improve the rheological properties of sludge by MSW mixed landfill, and to accelerate the process of landfill degradation and stabilization;
 4. 4) to determine the sludge and MSW mixed landfill design parameters (sludge and MSW mixing ratio, the ply thickness, agent suitable type and number and construction main points and methods of operation requirements, in order to effectively improve sludge's rheological properties, degradation characteristics and control of sludge to landfill stability characteristics;
  5. Landfill safety monitoring method and engineering risk assessment and early warning analysis of sewage sludge MSW.
Development direction and trend  
   With the development of economy and the continuous improvement of the level of city, industrial waste water and domestic sewage emissions increase, a sharp increase in the output of sewage sludge. According to statistics, in 2006 China's city sewage treatment plant sludge (water content 80%) is as high as 15000 tons, garbage removal amount of 8%. by 2000, China sewage treatment rate is only 40%, but the sewage sludge production reached 5 million 320 thousand tons (dry weight), equivalent to 80% moisture content of sludge is 22 million 600 thousand tons, but also continue to grow at an annual rate of 8%-10%. In addition, China's neighboring city rivers and lakes have been seriously polluted, containing sediment high concentrations of heavy metals and toxic organic compounds (polluted sediments are attributable to the sludge) also need to mining, dredging and disposal.  Also, our close to urban rivers and lakes have been seriously polluted, containing high concentrations of heavy metals and toxic organic compounds in sediment by serious pollution of rivers and lakes sediments are attributable to the sludge) also need to mining, dredging and disposal. All these lead to sludge landfill disposal demand is increasing. Although foreign sludge landfill technology has been more mature, but because domestic urban rubbish are abroad than to much more complex, and foreign sewage treatment plant sludge solidification / stabilization pretreatment standards, funding and narrowing of the gap between our country and the too big. Therefore, the achievements of other countries cannot be applied directly in domestic.
   Although in recent years the disposal of the sludge has begun to be of concern to the people and has made some achievements, but in general, the research reserve in sludge disposal in China is not enough, as one of the main way of sludge disposal, sludge landfill technology is still very weak, sludge into the MSW landfill field technology still needs a breakthrough research support.
   Fundamentally stop the sludge "collapse", it is necessary to further broaden the thinking, from environmental engineering and geotechnical engineering in close combination with the angle, and further solve the sludge on the environment influence, comprehensive geotechnical characteristics of sludge, grasp the engineering mechanical properties of the sludge landfill, and give full play to advantages of sludge and MSW mixed landfill, open a new path for the safe disposal of sludge; at the same time, to explore the relationship between environmental engineering and geo-technical engineering methods, find a can meet the environmental requirements, and can satisfy the engineering operation and safety requirements of the sludge landfill theory system and technical scheme.
   Therefore, deeply carefully carry out the following research work, for the sludge landfill operation, sludge and MSW mixed landfill of rational design, construction, operation, and provide effective theoretical guidance, technical support and engineering experience and for sludge landfill specification and engineering safety standards to formulate a reasonable provided the theoretical and technical basis, the following research work will also become research hot-spot and development trend of sludge landfill engineering:
  1. for sludge geo-technical characteristics corresponding to landfill access conditions, explore the geotechnical characteristics and landfill sludge access conditions of pile height, slope, limit the amount of landfill sludge into related MSW landfill, in order to access conditions of sludge landfill optimization design are given to provide a theoretical basis to carry out research on the MSW soil. The mechanical properties of the sludge mixed filling effect on sludge landfill construction; investigation of various natural drying or artificial dehydration, content and the maximum dry volume and mixed landfill during the construction of the optimal rolling and rolling method of landfill function with the best curing stabilization method of pretreatment of sludge after sludge pretreatment methods, and then put forward landfill and reasonable and practical method, to solve the difficult problem of sludge landfill operation.
  2. In order to eliminate sludge landfill late effects of sludge MSW landfill field stability of two engineering problems: rheology and degradation problems and scientific research. In view of the problem of sludge rheology, the sludge and mixture of different proportion (mixed sludge and MSW) and different paving thickness, different kinds and quantities of change agent and landfill under different construction conditions heap the rheological characteristics were studied, the study of sludge and sludge landfill landfill body of pore water pressure and the pore air pressure generation and dissipation, to reveal the mechanism of sludge rheological and grasp the rheological law, which could effectively improve the sludge rheology of mixed landfill design parameters and construction points.
  3.  the development of sludge landfill site monitoring technology, the establishment of risk assessment and engineering safety early warning system of landfill sludge. To explore throughout the construction of sludge landfill operation, with a new real-time monitoring technology for convenient continuous non-destructive characteristics, guarantee engineering safety landfill; monitoring and numerical simulation in combination on the basis of the construction of landfill. The deformation and mechanical model of instability failure, safety analysis and evaluation of the project; for the engineering staff, the establishment of industrial sludge landfill has the advantages of simple operation, process risk assessment and engineering safety early warning system of high reliability and extended easily, the sludge landfill engineering and environmental safety assessment "prediction and warning. The failure accidents in advance rectification to provide technical support for the establishment of MSW landfill deformation; sludge characteristics evolution prediction model is proposed for the The design and calculation methods of various pretreatment sludge landfill sites "engineering stability measures, the reasonable scheme of the final closure of the landfill site to ensure the safety of the sludge landfill construction, operation and site re use.
 
 
   

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