Can cutting fluid waste be treated biologically? Metal cutting fluid is an industrial fluid used in the process of metal cutting, grinding, and grinding. It mainly plays a role in lubrication, cooling, and rust prevention. With the development of my country's industrial enterprises, the amount of cutting fluid widely used in the machinery manufacturing industry is also increasing. Metal cutting fluid will produce metal chips and other waste slag during the use process, friction heat will be generated during the cutting process, and bacteria will grow in contact with environmental media during repeated use, which will cause the cutting fluid to deteriorate and lose its effectiveness. Generally, the cutting fluid deteriorates faster in summer and needs to be replaced more frequently, and the use cycle in winter is longer. Due to the above reasons, the deteriorating cutting fluid needs to be replaced in time and thoroughly to ensure the production quality and safety. Therefore, a large amount of waste cutting fluid will be generated. Waste cutting fluid contains mineral oil, surfactants, extreme pressure agents, rust inhibitors and other additives. Its COD can reach tens of thousands to hundreds of thousands, and its properties are relatively stable. It is a serious pollution and difficult to handle. Hazardous Waste.
Onsite Failure Case
The biological treatment method is a treatment method that is widely used in engineering. Its technology is mature and the treatment effect is good. The biological treatment method uses the metabolism of microorganisms to degrade the oil and other pollutants in the waste cutting fluid. Aerobic biological treatment Aerobic biological treatment is to use the metabolism of aerobic microorganisms to degrade pollutants. According to the different carriers of microorganism growth, it can be divided into activated sludge method and biofilm method. The function center of the aerobic activated sludge method is the bacterial micelle, and the function center of the aerobic biofilm is the biofilm adhered to the Filter Material or the turntable. Post-hydrolyzable bacteria decompose macromolecular organic matter into small molecules and synthesize its own substances. Dissolved organic matter is directly absorbed and decomposed. Finally, protozoa and micrometazoa absorb and swallow organic matter and free bacteria. At this time, wastewater purification treatment is completed. . The activated sludge method has good effluent quality and low operating cost. It is more flexible and easy to control in operation and management, but there are also many problems. Compared with the biofilm method, the activated sludge method consumes more power and covers a large area, and there is more surplus sludge. , The biofilm law is more impact resistant, the equipment occupies a small area, and the microorganisms with a long generation cycle can survive. At present, the two methods for treating oily wastewater have mature applications. In view of the high concentration of organic pollution and poor biodegradability of waste cutting fluid, biochemical methods are generally not used to treat them directly, and most of them are processed by physical and chemical methods to improve their After biochemical properties, it enters the biochemical treatment stage, and biochemical treatment is a very important and commonly used method in the treatment of waste cutting fluid, because the cost of purely using physical and chemical methods to treat high-concentration waste cutting fluid is high, and the amount of physical and chemical mud produced is large, and the water is discharged. The water quality is unstable, and the operating cost of the biochemical method is low, and no secondary pollution occurs. Generally, the water quality of aerobic biological treatment is better, and the effluent water quality is relatively stable. Anaerobic biological treatment Anaerobic biological treatment is the application of the metabolism of anaerobic microorganisms to remove pollutants. It can also be divided into activated sludge method and biofilm method. The anaerobic biological treatment method is adapted to high organic load and does not require oxygen supply, so it saves power consumption and has a small amount of remaining sludge. The methane gas produced is a good fuel, but anaerobic organisms are more sensitive to toxicity. Damaged, due to the long generation cycle of anaerobic bacteria, it is more difficult to recover.
