Sludge is the product of sewage treatment. The main characteristics of sludge are high water content (up to 99% or more), high organic content, and easy to decompose and smell. This requires sludge drying treatment. The current sludge treatment process among them, the drying method of sludge treatment still ranks first. The following summarizes some technical answers about sludge drying for your reference.
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1. What does the product temperature mean in the sludge drying process?
Sludge is a kind of ultra-fine powder with high organic content. The purpose of sludge drying is to reduce and sanitize. Regardless of the disposal method, sludge drying itself does not change the properties of sludge, that is, temperature does not cause degradation of sludge products or quality problems. In view of this, whether from the perspective of the quality of the sludge product or the efficiency of the dryer, the higher the temperature, the better. However, due to safety issues, most sludge drying processes tend to lower the temperature of the product as much as possible, that is, reduce the ignition energy of the so-called dust explosion. However, according to research, the ignition energy of sludge dust is very low. When the concentration of oxygen and dust reaches a certain level, the ignition energy is as low as a few to a dozen millijoules at a temperature of about 100 degrees. When the ignition energy reaches 1 joule, 70-80 degrees is also sufficient to form a combustion. When the dust concentration is higher, even the environment of 20-30 degrees may be at risk. The spontaneous combustion and explosion of many silos belong to this situation. In order to ensure a certain treatment efficiency in the sludge drying process, the temperature must exist, and it will not be very low, the typical value is between 105-125 degrees. The safety of the process can only start from reducing the dust concentration and suppressing the combustion atmosphere. It is incorrect to simply rely on lowering the product temperature to ensure safety.
2.Why is sludge composition analysis necessary for sludge drying?
Based on experience, a certain analysis of the sludge composition is necessary for determining the sludge drying process, obtaining suitable design parameters, and confirming working conditions. The content of wet sludge testing related to the sludge drying process includes: moisture content, viscosity, fat content, acid-base corrosivity, sand content, etc. The content of dry sludge testing related to sludge includes: heavy metal content, organic matter content, calorific value, bacterial content, etc.
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3. What is the solid recovery rate of the cyclone separator?
In many thermal convection systems, all or part of the products must be collected by cyclone separation for sludge drying. Due to the different air volume and pressure of each process, the particle size and ratio of the particles recovered by this method are different, resulting in the design The difference is huge. Generally speaking, the solid recovery rate of the cyclone separator is between 95-98%. The higher the solid content, the smaller the particle size of the product, and the difficulty of capturing will also increase.
Tag'Sludge Dryer, sludge drying process, questions about Low Temperature Sludge Dryer
Mintek's focus is chemical solutions. Our lime-based products include quicklime and Calciment® LKD, which effectively dry sludge and are often used as a final conditioning step to further improve handling characteristics.
When determining the best drying method, waste minimization should be considered. Many techniques can add significant weight or volume which increases the overall sludge disposal cost. Since both quicklime and Calciment® LKD 'consume' water, they can provide an effective drying solution and can also be used to complement mechanical dewatering processes.
One of the most effective techniques to dry sludge is using the proper chemical reagent. Chemical drying is often simpler, faster and less costly than other drying options. Lime-based reagents from Mintek will chemically combine with the water in sludge to dry the waste into a manageable material. An additional benefit of sludge drying with quicklime and Calciment® LKD is that the chemical reaction creates enough heat to drive off additional moisture contained in the sludge. This, coupled with reducing the overall sludge volume and weight, often leads project owners and engineers to consider lime-based products to simplify the process. Additionally, Mintek's products can be more cost-efficient and easier to implement in an operation; this is especially the case for temporary systems or field remedial applications when compared to the more complex mechanical systems.
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