Reading guidance：Different from residual sludge of domestic sewage, because of the different content of the different components in the process, the treatment and disposal of the sludge should have its own specific met

    Different from residual sludge of domestic sewage, because of the different content of the different components in the process, the treatment and disposal of the sludge should have its own specific methods.
   1. Composition and classification of paper making sludge
   In the paper making waste water treatment process will produce a lot of sediment, the sediment is called biological sludge, is generally divided the group: fine fiber, lignin and its derivatives and some organic substances. Application of peroxide pulping and paper making sludge components with different raw materials in chemical pulp, deinking and after activated sludge composition two the process is slightly different. The alkali recovery white mud from alkali recovery plant white mud recovery section, is a product of causticizing reaction, precipitation of calcium carbonate, mainly produced in the pulp and paper factories. The deinking sludge produced in waste paper deinking, deinking sludge composition is very complex, mainly cellulose fibers and the original paper fillers and coating, in addition to a number of short fiber, coarse slag and most of the ink particles.
   Paper industry sludge can be points into the following categories: a sludge -- produced raw wood pulp and paper making sludge; deinking sludge, secondary fiber using the sludge produced in the deinking process; two-stage sludge, produced through the secondary treatment of activated sludge; sludge, waste paper and activated sludge mixed with sludge.
2. Common disposal methods of paper making sludge
   Disposal methods of sludge treatment has undergone oceanic jettison, landfill, composting, incineration and deep processing, re-use etc., and gradually mature.
   3. Reclamation utilization of sludge
The disposal of sludge "harmless, reduction, resource-based" as a fundamental requirement. From waste in the extraction of useful material recycling, not only effectively solves the problem of environmental pollution, for social and economic development made a significant contribution. Paper making sludge due to the characteristics of the components themselves in a variety of ways to achieve the resources.
A. Use paper making sludge to make artificial permutite
   According to 2003 138 years, no14. reported, in Shizuoka, Japan. Annual produce paper mill sludge about 100 million tons, paper mill sludge mainly composed of existing in the original paper in calcite, talc and kaolin, the inorganic compounds in the calcination process into gelignite, meta kaolin, partial slip stone and lime.
   B. Use paper making sludge to produce building materials and cement plates
  Danish full cirdeproducts developed method of deinking sludge of high quality construction material and used directly in the construction and decoration industry, in this process does not require adhesive, cement or any harmful additives, the workshop is not solid waste, all the bits and pieces, sanding residue materials are in the production of recycling.
  C. Use paper making sludge to produce stuffing and coating pigment
  According to 2003 138 years, reported in the no14., Shizuoka, Japan Fuji industrial research that study the recycling paper mill sludge ash as paper making filler. Treatment sludge method including carbonization of paragraph 1 and paragraph 2 calcined incineration, the ash is easy to ground in a ball mill, and will not damage the structure formation; the whiteness of the ash is about 65%; pass into the carbon dioxide to the slurry can improve circulation packing in the hand sheets page retention rate.
   D. Use sludge to produce cement
   In Austria, the dry degree of 50% of the sludge is sent directly to cement plant kiln. A using hot flue gas dryer will dry sludge degree from 50% in Austria, the dryness for 50% of the sludge is sent directly to cement plant kiln. A the hot flue gas dryer to sludge drying degree from 50% to 70%, then the oil in the rotary kiln to burn. Around, then the oil combustion in the rotary kiln.
   E. Use paper making sludge to make waterproof roll materials
   Current research shows that paper-making waste mud (mud or deinking sludge) as filler instead of calcium carbonate, polyethylene chloride waterproofing coiled material can be made, and also can be used for manufacturing the original use of calcium carbonate as filler other waterproofing materials, including modified asphalt waterproofing membrane and high molecular waterproof coiled material. The waterproof coiled material not sticky can save coating anti adhesive process, thereby saving talcum powder and reduce production cost.
   F. Use sludge to make fertilizer
   Composting is the sludge fermentation process. In the sludge added a certain amount of leavening agent and conditioner (such as straw, straw, sawdust or garbage etc.), using the microbial communities in the humid environment of organic matter oxidation decomposition and transformed into humic substances.
  G. Use paper making sludge to improve soil
  Due to the sludge contains large amounts of organic matter and nitrogen, phosphorus, potassium and trace elements, as a slow-release organic fertilizer, to increase soil fertility, improve the yield and quality of crops.
  H. Use paper making sludge to recycle energy
  The main ingredients of paper sludge sludge is lignin, sugar and salt, have a certain degree of energy use value, especially lignin and carbohydrate. Experts according to it contains a certain amount of organic matter, use of biomass pyrolysis and gasification technology, the low grade slag transformation for high grade of combustible gas, for the use of the original factory boiler or furnace, to save fuel, reduce pollution, waste residue of paper mill seek new outlets.
 
   
   
 
 
 

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