Reading guidance：With the sewage treatment plant and a new, sludge treatment has attracted more and more attention. In sludge treatment process, the release of sludge microbial cell inclusions is an important step, whi

    With the sewage treatment plant and a new, sludge treatment has attracted more and more attention. In sludge treatment process, the release of sludge microbial cell inclusions is an important step, which requires first sludge was pretreated to follow-up to better treatment and disposal of sludge.
    Sludge pre processing purpose is to destroy the sludge structure and fine material make it easy for degradation of the material, which can not only promote microbial cryptic growth and reduce the sludge production and intracellular release of organic compounds as a carbon source to be use, improve the nitrogen removal effect of phosphorus removal, sludge minimization and resource. The sludge pretreatment and the number of methods for it?
     1. Pretreatment technology of ozone
     Ozone is a strong oxidant, reaction with the bacteria in the sludge, destruction of the cell wall, releasing cells within the cytoplasm and continue to macromolecular organic matter degradation for small molecule and improve the biodegradability of the follow-up system, reflux into the aeration tank can also as a carbon source, so as to improve the biological nitrogen removal efficiency.
     Ozone oxidation because of its high efficiency, simple, no secondary pollution and has attracted much attention. The future direction for further research: continue to study the mechanism and basis to further improve the efficiency of ozone oxidation technology to explore conditions on the impact of this technology and the scope of application and obtain the optimum operation parameters; further expand research scope, combined with the actual project, will be the extremely rich potential technological applications in practical engineering.
     2. Alkali pretreatment technology
    Alkali treatment mainly plays a role of oh-.oh- in addition to destroy the sludge floc structure, but also can be in a certain temperature, hydrolysis, the saponification of the cell wall and the cell membrane protein and lipopolysaccharide, destruction of microbial cell structure, the intracellular substances to the low concentration of extracellular environmental releases. With alkaline treatment as a simple and traditional processing methods have great potential.
    Alkali pretreatment can improve the hydrolysis rate of the sludge in the anaerobic digestion process for improving the performance of sewage sludge digestion. But the alkali treatment will increase the concentration of salt ions and subsequent processing difficulty, and easy to equipment corrosion caused by, cost is high. In addition, although NaOH thawing cell effect is the most ideal, but considering the effect and economic factors, studies have considered cheap and in other solid waste treatment widely used lime sludge treatment is also a good choice.
   3. Preheat process technology
  Heat treatment is by heating the sludge part of microbial cell body heat expansion and rupture and release proteins, minerals and cell membrane fragments. With increasing temperature, accelerate the hydrolysis rate of the sludge and the degree of hydrolysis increased, low molecular organic compounds and organic acid concentration increased. The method is currently more research, a wider application of a sludge pretreatment technology.
   In future studies, it should be in the mechanism of sludge heat treatment, reduce generation of material degradation and enhance the release efficiency of organic matter and further research. At the same time, attaches great importance to the research of efficient sludge heat treatment process and heat treatment and other processing methods combined with and develop the low consumption of sludge thermal treatment method and apparatus.
  4. Microwave pretreatment technology
   Microwave pretreatment is a very fast disintegration technology. Sludge organic solids in the microwave irradiation process through dissolution and hydrolysis. The first is discrete and disintegration of microbial floc, intracellular organic matter is released gradually dissolved, and dissolved organic matter continuous hydrolysis.
  The application of microwave technology in environmental engineering at present only in the research stage, the practical industrial application is not widespread. But along with the further understanding of microwave technology and related technical problems to solve and future of low energy consumption, environment friendly technology to improve, microwave technology in environmental pollution control engineering will play its due role.
  5. Supersonic wave pretreatment technology
    Ultrasonic is a kind of damage to the cells leads to the release of intracellular substances method and its principle are hydraulic action harmony reaction. Treatment of sludge with ultrasonic technology, is the use of ultrasound in liquid cavitation, the formation of extreme physical and mechanical conditions, sludge microbial cell wall busting, decomposition of sludge flocs, floc size becomes smaller.
    Ultrasonic cell lysis has a clean, safety, low power consumption and other characteristics, making the operation cost of this technology greatly reduced, is a new technology is worth popularizing. Although ultrasonic technique is applied to the actual engineering also need some time, but so far, at home and abroad has from different aspects of ultrasonic solution cell were a lot of research, I believe that ultrasonic technology in sludge treatment direction will play a more important role.
  6. Biological pretreatment technology
  Novel thermophilic heat solubilized enzyme (solubilization by thermophilicenzyme, referred to S-TE) technology, namely through the advantages of addicted to thermophilic bacteria in suitable conditions, secretion of extra-cellular enzyme activity of biological thawing cells reached on sludge short, efficient dissolved.
  7. United pretreatment technology
   With the sludge pretreatment processing technology research of deepening, people are no longer limited in application of a technology to promote cell dissolved, but to different technologies are combined, promote each other, to further improve the rate of sludge hydrolysis.
   Sludge pre processing method can effectively promote the release of sludge cell decomposition and intracellular substances, improve the performance of sludge digestion, accelerate the rate of digestion, enhancing the production of gas, but a variety of pre processing technologies have advantages and disadvantages. So choose different combination, developed a set of treatment programs in line with the actual situation is per unit of every enterprise to consider the problem.

 

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