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Cutting fluid biological treatment technology

Number of visits: Date:2015年12月16日 17:42

  With the rapid development of modern machinery manufacturing industry. There are cooling, cleaning, rust and lubricating the four functions of cutting fluid has been widely used in machining, only shortcomings that will deteriorate after a period of circulation cycle, hair smelly, failure. Consequent waste, can not be directly discharge standards, there are some ingredients that must be addressed environmental pollution. Such waste water containing an emulsifier, mineral oil, preservative and metal shavings, etc., is a high concentration of refractory organic wastewater. Due to its high degree of emulsification, chemical stability, biodegradability and poor, just very difficult to degrade treated by conventional water treatment technologies.
  In response to these problems, Tarrant Biological Engineering Co. selective membrane treatment technology and biochemical process of combining routes for waste processing, to achieve a better treatment effect.


  First, we choose for easy cleaning and a long service life of tubular organic membrane filtration treatment waste cutting fluid, the membrane pore size of 0.03 microns, the waste to the presence of emulsified oils and organic molecules are trapped to concentrate filtrate mainly low molecular weight organic compounds, their biochemical properties significantly increased. After the dope after repeated filtered and concentrated, the concentrate volume can be reduced to 5 to 10% of the original volume, a substantial increase in its oil content, reusable thermal separation or chemical separation method proposed oil or incineration.


  The filtrate was filtered through a membrane pretreated COD can be reduced typically from 50 to 90%, oil content of less than 10mg / L, although the biodegradability significantly increased, but because the filtrate still contains various components of complex organic compounds, such as surfactants and the like refractory material, typically ranging from a few thousand to tens of thousands of COD, conventional biochemical (activated sludge process, contact oxidation method, etc.) treatment is difficult to meet emission standards, conventional biochemical systems can not effectively degrade microbial population of each filtrate kind of organic components.


  Tarrant Biological Engineering Co., Ltd. R & D engineers filtrate organic component according to the type of bacteria in the company-specific library, select the appropriate main component degradation filtrate efficient microbial strains to filtrate water samples for the experiment and added general sludge by anaerobic and aerobic aeration COD degradation experiments performed. Anaerobic process, in addition to the inherent sludge microorganisms, adding efficient microbial strains targeted filtrate refractory organics will open loop, chain scission, etc., to break down into easily absorbed by the small molecules; aerobic phase, and efficient microbial strains continue to play its specific degradation capability, the degradation of various organic filtrate into CO2, H2O and synthesize their own reproduction for all kinds of cell walls, cell membranes and other substances.


  In Tarrant own a cutting fluid waste be tested, for example, the waste liquid COD about 50000mg / L, after the organic film processing equipment once the filtrate COD about 8000mg / L, accounting for about 8% of the concentrate, Mixed coal burning. The filtrate was added 5% of normal sludge (from sewage treatment plants) and adding efficient microbial agents, through anaerobic + 24h 24h after Aeration culture COD was reduced to 450mg / L, reached (GB8978-1996) Integrated Wastewater Discharge The second highest standard pollutants allowable emission concentrations (after 1 January 1998, the construction unit) in three standard (other emission units).


  The above process is characterized by simple, easy to operate, cost savings, and environmental protection. Compared to the commonly used chemical method saves a lot of agents, while producing less sludge, in addition to concentrated liquid organic extract oil recycling or incineration, most organic matter is decomposed by microorganisms for the environment-friendly inorganic (CO2, H2O, etc. ), it is a highly efficient method of processing the waste cutting fluid. Its technical key point is acclimated efficient screening and agents, and are able to get to the filtrate, the effective use of refractory material related to whether microbial strains can meet emissions standards.


  Cutting fluid on the environment and human pollution and cause some damage, so the use of cutting fluids and waste treatment has been constrained increasingly stringent environmental regulations. Research and promotion of cutting fluid waste treatment technology has become an important topic of modern cutting fluid studies. "Film + biological agents" in the field of sewage treatment technology uses mainstream biochemical basis, by a membrane treatment to reduce the processing load on the cutting fluid waste COD, targeted and efficient agents added to ensure that their treatment effect, its simplicity The process and low cost advantages worth further research, promotion.

 

Membrane filtration filtrate

 

Efficient agents

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