Reading guidance：At present, our country pay more and more attention to sludge disposal. From 2009, china has issued many standards to control and manage sludge in succession. These standards consist of many aspects, s

    At present, our country pay more and more attention to sludge disposal. From 2009, china has issued many standards to control and manage sludge in succession. These standards consist of many aspects, such as land utilization, landfill, building materials and incineration. Thanks to government’s fund and policy supports, sludge disposal accounts for a more and more market proportion. Sludge disposal technology has been developed to some extend.
  Combined with Sewage treatment plant sludge treatment and disposal and pollution control technology policy (for Trial Implementation) and 8 standards, it can be summarized that the final aims of sludge disposal focuses on land utilization, brick making, incineration and landfill. The indexes of sludge drying products were compared with the standard limits, and combined with the local climate, environment and economic characteristics. The main resources of the sludge products were analyzed.
Land utilization
    There are a great amount of nutrients which can benefit growth of plants. It can be used a kind of good fertilizer and improvement agent. A lot of field experiments show that sludge used for farmland, can improve soil physical and chemical properties, increase soil nutrients, improve soil cultivation. But due to the sludge in the presence of heavy metals, different crops on heavy metal accumulation ability is different. Therefore, we should strictly control the application amount, also the contents of heavy metals is decided whether sludge application on land use of the main factors.
    After comparing sludge treatment and heavy metal content in the product with related land use standards, we can find that heavy metal content could meet the standard requirements and can be used. However, considering the domestic sludge land use direction less monitoring data, for the sake of conservative, sludge products used in non food chain crops, or product sludge as a raw material for fertilizer use.
Incineration and power generation 
I    ncineration consists of two kinds, single incineration and auxiliary incineration. Single incineration is mainly applied to sludge with low moisture content. After being dried, sludge will be incinerated through incineration furnace. On one hand, power generated is used for normally running of incineration system. On the other hand, it can also be used for former drying disposal stage. Auxiliary incineration mainly relies on boiler burning system in existing thermal power plants. This incineration method will burn the mixture of sludge disposal products and coal. At present, there is no relevant standards on flue gas emission in sludge mixture incineration. In real operation, dioxin produced hasn’t got effective control. If our country want to issue the corresponding flue gas discharge standards and technology policy, is bound to greatly improve the the technology of flue gas processing investment and operating costs, the economy to bear. In addition, we use the sludge co firing, fly ash in flue gas in molten adhesive obstruction, flue gas of large displacement, large heat loss, the thermal efficiency of the boiler decreased reasons, but also restricts the application and popularity of the technology. Thermal power plant auxiliary incineration project implementation need coordination of related government policies, and comprehensive consideration of the sewage treatment plant, sludge treatment plant, thermal power plant in the distribution of the distance necessary factors.
    After detection, we found that Shenyang after biological drying sludge product dry low calorific value is about 1 600 kcal / kg, moisture content below 40%, for incineration power generation use. Preliminary estimates, if the direct burning of, with daily incineration 200t dry products, for example, daily about power 6.6 million kW / h, except for incineration system, and will be able to meet the biological sludge dry process system daily operation of the electricity consumption.
Cover soil for garbage landfill places
   When sludge product can not be applied to land utilization and incineration power generation. You can consider dispose sludge by using landfill. Due to the moisture content of the sludge product rate is low (40%), can be used as landfill cover soil Tim feeding. At the same time, research shows that the lower water content, sludge and soil mechanics strength index of the corresponding high, meet the requirements in the standard transverse shear strength is more than or equal to 25 kPa. In actual use should be strengthen the monitoring of soil strength index, when necessary can be appropriate additive, in order to ensure the stability of cover soil.
    In recent years, thanks to state’s policy guidance, sludge disposal projects have been put into establishment and utilization. Along with that, new problems appear which is how to dispose sludge products. If the product is not reasonable utilization or disposal, still will cause pollution to the environment. Only the sludge as the ultimate goal of sludge disposal, can effectively and completely solve the sludge problem. Therefore, paying more attention to product sludge outlet, strengthening of sludge resource utilization to study and perfecting sludge disposal industry policy support are particularly important. 

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