Reading guidance：With the development of industrial and urban sewage treatment rate increasing, the amount of sewage sludge will become increasingly large. Sludge is a solid waste, but it is different from the general

  With the development of industrial and urban sewage treatment rate increasing, the amount of sewage sludge will become increasingly large. Sludge is a solid waste, but it is different from the general industrial solid waste, its physical and chemical properties is very unstable, in storage, transport and handling process of change, if not properly treated, the bacteria in the sludge, heavy metals, as well as in the process of decay of exhaust gas can be through a variety of ways to human, animal and environmental harm.
   1. bio-film carrier packing
  The core of performance is formed on the filler in the sewage degradation of material formed on the filler in the carrier bio film waste water treatment of a kind of common method. Biological membrane method is that microorganisms attached to the solid filler surface reproduction, filler is microbial, microbial bio film, bio film in the metabolic process in the absorption of sewage, sewage water. Because of the biological membrane method is a common method. Biological membrane method is that microorganisms attached to the solid filler surface reproduction, the filler is microbial carrier, microbial bio film, bio film in the metabolic process in the absorption of sewage in the matter, to achieve waste water degradation. Therefore, the packing waste water bio film waste water treatment process.
The filler should be rich in surface, for microbes provide attached to the surface and interior space, with biological adhesion strong, hanging membrane with good performance, good flow pattern, back flush easily, sewage interception ability and strong advantages. Filler, inorganic filler, organic polymer filler.
 Biological membrane carrier, is the main raw material for dehydration of sludge from sewage treatment plant, additive fly ash fine powder is collected from pulverized coal furnace gas in thermal power plant, there is a small amount of clay. The filler material can reduce the production industry and agriculture for soil problems, but also to meet the reduced cost of water treatment and recycling. The purpose is, waste, waste utilization of green building materials. In the experiment of preparation of filler in sludge, factors affecting the performance of the major filling sludge, fly ash and clay dosage, sintering temperature and holding time. Through orthogonal test, determine the preliminary preparation of filler firing temperature of 1000 + 25 DEG C, sludge dosage 70%, fly ash and clay content was 15%, the holding time is 40min.
  2. The influence of sintering temperature to the compressive strength of the filler
The results show that under the conditions of low temperature, low strength filler, loose structure; with the increase of temperature, gradually increase the strength of filler, when reaching the maximum value when the temperature increases, the strength will no longer increase. This is because the particles in porous ceramic products depend on the adhesion formed in high temperature adhesive the firing temperature of glass phase bonding, high temperature binder during the sintering process on the surface of aggregate particles formed on a layer of glass, a network is formed in the aggregate, improve the mechanical strength of the filler. If the temperature is too high, the surface will melt haydite, destroy the micro-porous structure of ceramic surface, serious will stick together near the ceramsite, destroyed the grid structure caused by the decrease of strength.
3, the effect of sludge amount on the water absorption of sludge filler
The results show that the higher amount of sludge, clay and fly ash dosage reduction, bibulous rate is small. This is because on the one hand in clay generally contain calcium carbonate and magnesium carbonate. Calcium carbonate strong decomposition is 850 DEG C to 950 DEG C, magnesium carbonate between 500 DEG C to 600 DEG C, and producing gas; on the other hand, fly ash containing F C 2O3, in high temperature oxidation reduction reaction, gas release, increase the hole, increasing the pore, the filler of the water absorption rate increases.
4. the effect of sintering temperature on the removal rate of filler CODcr
  Different ratio, different sintering temperature of filler, the ability of the CODcr removal rate is a gap.
5. Best conditions
   The best test parameters of the preparation of the packing: 70%, additive clay 15%, fly ash 15%, firing temperature of 1000 to 25 degrees, the heat preservation time 40min. at this time, the internal porosity of the material particles is developed, the appearance is hard, the strength is better.
   Using sludge as main material making filler particles, provides a reasonable way for the disposal of sewage sludge, with certain environmental benefit, economic benefit and social benefit.
 
 
 
 
 
  
 

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