Reading guidance：The sludge contains a large number of pathogens, microbial substances, heavy metals and organic pollutants, sludge is mainly solid waste generated in the sewage treatment plant sewage treatment process

     The sludge contains a large number of pathogens, microbial substances, heavy metals and organic pollutants, sludge is mainly solid waste generated in the sewage treatment plant sewage treatment process. According to the relevant data show that the landfill disposal of sludge in China at present and in the future period of time will be our main way of sludge disposal, sludge after pretreatment after processing into the landfill sludge disposal method is suitable for the current domestic situation in our country is biological, has a strong practical sludge treatment way. Through the results of the study, adding curing materials after the treatment of sewage sludge as landfill cover can meet the material and used as filling packing requirements, resources can be achieved use. Curing sludge is a kind of soil material modified with cement as curing material, the material properties of the alkaline stability mainly depends on the hydration products of cement To maintain. After solidification / stabilization treatment, sludge biochemical environment changed. microbial activity was inhibited, slow down degradation rate of organic matter. However, sewage sludge using solidification landfill engineering application and microbial action makes organic matter degradation exists the possibility and organics in anaerobic environment can be degraded for methane. Taking advantage of stabilization pretreatment to reduced the emission of methane from the landfill is still low-carbonization strategies in china.
     Landfill can be regarded as a huge biological reactor, the degradation process of sludge in landfill is dehydrated sludge dry fermentation process, namely dry anaerobic fermentation process of sludge. The sludge will produce a large number of CH 4 and a small amount of H 2 in the dry fermentation process, provides a way for sludge additives. It can significantly change the physical properties of the sludge and Leach ate Pollutants in sludge properties and transformation with additives has close relationship with lime stabilized sludge as landfill cover affect to waste degradation due to leach ate lime neutralization, when leach ate infiltration down after daily cover, the increase of pH, can stimulate methane according to the study. Shanghai city sewage treatment plant sludge treatment process and the physical and chemical characteristics, the sludge is divided into biochemical sludge and chemical sludge. Mixed landfill sludge can be accelerated the reaction of anaerobic gas production and degradation of organic matter, shorten the time of sludge stabilization. Solidification / stabilization of sludge landfill can reduce the risk of heavy metal leaching, but the activity of Thiobacillus in sludge heavy metal leaching may exist again. The sludge after solidification / stabilization treatment of landfill, landfill gas, liquid production characteristics is not clear. It will cause direct effect to the anti-seepage design of landfill place at present. The research of bioreactor landfill stabilization control from the macroscopic angle, from gas law and the gas-liquid conversion process of simulated landfill, especially the influence factors of solid sludge, organic matter degradation to produce gas and water change research less. On the basis of landfill field, construction of sludge landfill column simulation alone indoor gas and gas-liquid conversion mode of solidified sludge addition of different materials, solidification / stabilization, which will provides technical support for safe and stable of sludge landfill.
      In the stable and solidified process of sludge, the generation rules of gas and liquid can be summarized as following: 1. Moisture content of solidified sludge will increase with time going by. Accordingly, degradation rate of organic matters will reduce with the increase of solidified materials, which shows that solidified will restrain sludge degradation obviously; 2. In closed and stable environment, degradation process of raw sludge and solidified sludge makes the content of organic matters reduced constantly; then, content of gas and moisture content will increase constantly; when the content of solidified materials reaches to 25%, gas produced in water change process is less; degradation is restrained strongly; 3, the amount of solidified materials added is different; change rules of gas amount produced are different; gas production rules for raw sludge and solidified sludge are divided into two types: in early period, gas production speed increases in a linear way; after reaching to a highest speed, gas production speed will decrease in a linear way; gas production for solidified sludge with low added amount is divided into three stages: restrain stage, increase stage and decay stage; solidified sludge with high added amount only holds one gas production stage. Gas production speed will decrease with time going by; the amount of gas produced is less.
 

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