Reading guidance：Generally refers to the sludge is refers to the use of physical method, chemical method, physical and chemical method and biological method in the treatment of waste water produced precipitate particle

    Generally refers to the sludge is refers to the use of physical method, chemical method, physical and chemical method and biological method in the treatment of waste water produced precipitate particles and suspended matter. Sludge between liquid and solid between thick, but it is difficult to through sedimentation solid-liquid separation. Sludge composition is very complex, the moisture content of sewage sludge. The water is broadly divided into four categories: gap water, adsorbed on the surface of the water, capillary bound water inside the particles of water. Also contains the hard to degradation of organic matter, heavy metal salts and small amount of pathogenic microorganisms and parasites eggs, and often accompanied by stench smell, such as without processing any emissions, on the environment causing serious secondary pollution. 
Choose proper sludge dehydration process according to local conditions
Design practical process technology according to local conditions
  1. For users without heat source, we should adopt chemical modification of drying technology. The technology is through to the sludge adding lime and sludge can be quickly heated to 100 DEG C, short time in large quantities of water vapor evaporation and achieve the drying, dehydration and sterilization purposes.
  2. For those users who have heat source, adopt steam drum, belt and paddle dehydration technology;
  3. The flue gas heat users, should use the rotary drum, spouted bed, fluid granulation drying tower or mesh belt type drying technology.
  4. For new projects, in energy conservation, economic operation principle, recommended cold mechanical pressing dehydration process and utilization technology of flue gas heat process of dehydration process of combining. Because the sludge concentration to 60% water 75% water, this stage is mainly water form free water, easy to use mechanical dehydration and cooling process and should not be used thermal dehydration process, such as the use of heat dehydration, need to consume a large amount of heat, less effective, contrary to the principle of conservation of energy, the operation of economy; sludge concentration to 30% water 60% water, this stage is mainly water surface water, internal water form, also contain a small amount of free water, the sludge mechanical dehydration is cold the process can not be completed, should adopt the thermal dehydration process.
Comprehensive utilization methods of sludge dehydrated particles
  1. There is a certain value of dry granular sludge mixed with Coal Co firing. Sludge drying according to a certain percentage of incorporation in Coal Co firing has been running in a paper company good and stable, according to the statistics of the user, 55% of the water content of sludge, the whole control of PLC system, saving a lot of manpower, material, 11 degrees of tons of raw materials consumption, monthly coal saving 48 million yuan, not only to achieve the to waste waste to protect the environment, and has considerable economic benefits.
  2. Low calorific value sludge for making light energy-saving brick and producing cement pressing product
   For the lower calorific value of sludge, primary dry sludge solidification technology of sludge with 60% water content, according to the scientific ratio of heavy metal solidification is not lost, for the production of lightweight bricks and cement products and other building materials production pressure. This product conforms to China's "energy conservation, protection of farmland, according to local conditions, local materials development of building materials policy, in line with the State Council had forwarded" strict restrictions Huitianshaozhuan actively promote the reform of the wall, the Ministry of Finance in accordance with national opinion "document" on the part of the comprehensive utilization of resources products continue to implement value-added tax preferential policies of the notice ", the product is free of VAT building materials. Because of the high strength materials, durable good, standard size, shape, Kizawa Junchi, has a natural rustic appearance, do drywall can make any decoration. It is a substitute of the clay brick pole The technology has the advantages of no two pollution, high safety, low investment, and then the product can be realized.
  3. Make sludge into fertilizer
    Paper making sludge and municipal sludge due to its containing organic matter is good agricultural organic fertilizer raw materials, comprehensive utilization, the fat to treasure, to achieve circular economy. The project is will sludge with additives (strain, straw, fly ash and N, P, K nutrient elements, etc.) is prepared by mixing can be conducive to the spread of organic and inorganic compound fertilizer. This type of fertilizer products, organic and inorganic fertilizer, to increase the yield of crops and soil conservation has obvious effect, has great potential for development of agricultural fertilizers.
Fertilizer project of this system is to achieve the sludge harmless, resources, stabilization, and realize the value of the regeneration of the, the market prospect is considerable. The project has the following characteristics: (1) so raw materials and additives for industrial and domestic waste, low cost; (2) the product is granular, easy to realize mechanization sowing and fertilizing; (3) the product can according to different soil conditions, through the conditioner for adjusting pH value, meet the requirements of different crops on the soil conditions. Technology of the product has good adaptability, by adjusting the additive and a process recipe, of a wide range of organic and inorganic fertilizer.
  
 
  

：Traditional disposal technologies for sludge ：Tell sludge disposal from sludge treatment clearly Learn from foreign experience