Xinzhi freeze-drying technology assists sludge pretreatment
First, the background Sludge is a by-product of sewage treatment. It contains a mixture of various colloids, organic matter and inorganic substances. The untreated sludge has complex components. In addition to containing ash, it also contains a large amount of organic matter and refractory organic matter. A variety of trace elements, pathogenic microorganisms, parasitic eggs, heavy metals and salts. The sewage and sludge systems are complex and have many interference components, which brings certain difficulties to the analysis. Therefore, the method of removing impurities and other components is required to be reasonable and effective, and because the target compound content is low (usually at the trace or ultra-trace level), to ensure the sensitivity of the analytical method, the impurity-removing method is required for the target research group. The safety of the fractions is due to the fact that the conventional drying method has a certain destructive effect on some of the research components. Therefore, the vacuum freeze-drying technique is considered to be an effective method for drying sludge and is applied to such research. The material of this article was compiled from Mr. Yan Jiaxuan, the technical director of the Water Quality Monitoring Center of Beijing Urban Drainage Group Co., Ltd., and I would like to express my special thanks to Ms. Second, the advantages of freeze drying sludge treatment 1. The entire lyophilization process is carried out at low temperatures to avoid loss of volatile substances such as mercury; 2. The entire freeze-drying process is carried out under confined conditions to avoid environmental pollution; 3. After drying, the sludge is loose and porous, which is easy to grind; 4. The lyophilization method has high efficiency and can freeze more than 20 samples in 16 hours; Third, freeze drying method sludge pretreatment process introduction (1) Pre-freezing: When the product is freeze-dried, it needs to be filled into a suitable container and then pre-frozen to perform sublimation drying. The pre-freezing process is not only to protect the main properties of the material: but to obtain a reasonable structure for the sublimation of the water after freezing: there is also a proper capacity for future applications. The product is dispensed into the container to have a certain surface area to thickness ratio. The surface area is larger and the thickness is smaller. The large surface area is conducive to sublimation, and the thickness of the product is not conducive to sublimation. Generally, the thickness of the package is not more than 10mm. Pre-freezing can be carried out in an ultra-low temperature freezer. (2) The first stage is analytically dry. This stage is mainly sublimation drying. It is generally believed that the proper pressure of the freeze-drying box is between 0.1 and 0.3 mbar. In this pressure range, it is beneficial to the transfer of heat and the sublimation. (3) The second stage is dry. Once the product has been sublimed, the drying of the product enters the second stage. At this stage, although there is no frozen ice in the product, there is still about 10% of water in the product. In order to make the product reach the qualified residual moisture content, the product must be further dried. At this stage, the temperature of the product is rapidly increased to the maximum allowable temperature of the product and maintained at this temperature until the end of lyophilization. Rapidly increasing the temperature of the product helps to reduce the residual moisture content of the product and shorten the time for desorption drying. The allowable temperature of the product depends on the type of product. Fourth, the conclusion 1. Freeze-drying method can greatly shorten the sample detection cycle without causing loss of volatile elemental mercury. 2. After lyophilization, the uniformity of the sludge is better and the sample is more representative. 3. Determination of heavy metals after lyophilization of sludge can avoid deviation of results caused by water content 4. For wet sludge, no additional moisture content is required, which can reduce the workload. Five, Xinzhi frozen product introduction Performance characteristics √ This machine adopts the international famous brand Secop (formerly Danfoss) compressor, which has rapid cooling and low temperature of cold trap; √ ARM9 core control circuit design, 32M memory 128M FLASH; √ The control system automatically saves the freeze-dried data and can view it in the form of real-time curves and historical curves; 干燥 The drying room adopts colorless and transparent one-time injection molding polycarbon drying chamber, which is corrosion-resistant, non-fragile, non-adhesive, high in transparency, strong in airtightness, clear and intuitive in sample, and can observe the whole process of lyophilization; 真空 The vacuum pump is connected to the host computer with international standard KF quick connector, which is simple and reliable; √ The temperature of the cold trap can be set. When the temperature is lower than the set value, the vacuum pump is turned on to protect the life of the vacuum pump.  Application field  冷冻 Freeze drying of soil and sludge samples 冷冻 Freeze preservation of blood, bacteria and various organs 脱水 Dehydration and preservation of food 脱水 Dehydration preservation of Chinese and Western medicines 脱水 Dehydration protection of unearthed cultural relics and archive books  Technical Parameters references The material of this paper is organized from Mr. Yan Jiaxuan, Technical Director of Water Quality Monitoring Center of Beijing Urban Drainage Group Co., Ltd. Fruit juice drinks is a beverage made of fruit juice products obtained by physical methods such as pressing, centrifugation and extraction. Fruit juice retains most of the nutrients in the fruit, such as vitamins, minerals, sugar and pectin in dietary fiber. Often drinking fruit juice can help digestion, moisten the intestines and supplement the lack of nutrients in the diet. 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5. The lyophilization operation step is simple, the lyophilization process does not require personnel to be on duty, and can be carried out at night without affecting the daily inspection work. 
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