Reading guidance：With Beijing municipal sewage treatment facilities increased, treatment rate and improve the treatment level of deepening, sewage treatment plant sludge yield increased dramatically. In 2008, the Beiji

    With Beijing municipal sewage treatment facilities increased, treatment rate and improve the treatment level of deepening, sewage treatment plant sludge yield increased dramatically. In 2008, the Beijing municipal sludge yield reached 103.5 million T (moisture content 80%). Among them, 86.6 million tons of urban, suburban 16.9 million tons. According to the < Beijing City Master Plan (2004 - 2020) >, is expected by 2020, Beijing City, the annual sludge production will reach 200 million tons (80% moisture content).
    At present, Beijing only Daxing District Panggezhuang composting plant, Changping District composting plant, Fangzhuang lime drying plant, Qinghe thermal drying plant, Beijing cement plant and five seat sludge treatment plant, due to limited by some factors, such as the concept and capital, Beijing City have been built or built most of the sewage treatment plants are not designed to complete the sludge treatment system, commonly used is concentration, dehydration and a simple treatment can only achieve limited reduction, and cannot effectively stabilize, harmless. In sludge disposal taken by the majority of stacked, basically without considering resource issues. In sludge disposal most take is piled up, basically does not take into account the water. Beijing City Drainage Group, Beijing city water conservancy science research the the Beijing city sewage treatment plant sludge were sampling and test data analyses show that the Beijing municipal sludge containing heavy metals, pathogens, parasite eggs and other hazards to human health, such as processing is undeserved, will pollute the soil and water; also reflects the sludge in N, P, K and organic matter content is higher, there high exploitation and utilization value.
Technical explore of sludge disposal plants in Beijing city
   Sludge treatment and disposal technology route, mainly from the security environment, resources, resource output and income than other considerations, taking into account the ecological environment, the balance between social benefit and economic benefit. Beijing as the country's capital, from the geographical environment and economic and social development, with high population density, developed economy, land resources are relatively tight, energy shortage, the shortage of water resources, the large amount of waste water characteristics.
1. Land utilization and composting technology of sludge
   Sludge contains large amounts of organic matter and plant essential nutrients, the use of sludge as fertilizer can promote soil aggregate structure formation, accelerate the ripening of soil, enhances soil fertility, and water retention, fertilizer, improve soil temperature. Beijing's urban sewage treatment plant gradually transformed mainly to domestic sewage, treatment process to biological treatment is given priority to, sludge nitrogen, phosphorus, potassium and organic matter content is high, and heavy metals and toxic and harmful substances content is low, very suitable for composting. Whether it is from the economic factors, or from the fertilizer use factor of, sludge land utilization and sludge compost is a suitable disposal method. Sludge compost can be divided into sludge compost alone; sludge and municipal solid waste compost; sludge and leaves, fly ash, animal manure, straw and other conditioner for aerobic composting organic fertilizer into; sludge added mixed fertilizer and nutrients to produce organic compound fertilizer, and so on.
   From the soil organic matter of lack of analysis, according to every 1 hm2 application 3 000 kg of organic fertilizer the calculation, the city about application of 33.165 million T, in city greening area increased by a large margin, on the green planted ridging demand huge increase. Thus, sludge compost in agriculture, forestry and urban landscape greening land utilization has great development value and broad market demand.
2. Sludge drying incineration disposal technology
  In sludge landfill covers an area of large, and harmful substances in the sludge is not easy to control, the soil, groundwater and the environment will cause pollution, so to the municipal sludge implement large-scale landfill is unlikely. The sludge incineration is a kind of sludge disposal method which can realize best reduction aim.
  

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