The technical scope of sludge treatment and utilization and chamber filter press

      The knowledge of belt filter press will talk to you about the technical scope of sludge treatment and utilization and the chamber filter press

1. General technology for sludge treatment and utilization (1) sludge composting technology (2) sludge building material technology (3) sewage treatment sludge fuel technology (4) sludge anaerobic digestion (production Biogas) technology 2. Ionizing radiation sludge drying technology for sludge treatment 3. Application of microwave technology in sludge treatment (1) Microwave irradiated sludge treatment technology (2) Microwave chemical analysis technology 4. Ultrasonic treatment of sewage Sludge technology 5. Bioavailability of heavy metals and plant removal technology 6. Microbial treatment technology of sludge (1) Microbial leaching technology (2) Microbial adsorption treatment (3) Microbial deodorization technology 7. Emerging sludge thermochemical treatment Technology (1) Wet Oxidation Technology (2) Activated Sludge as Binder (3) Degradable Plastics from Excess Sludge (4) Activated Carbon from Sludge (5) O3/H2O2 Oxidation Technology (6) UV/O3 Oxidation Technology ( 7) UV/H2O2 oxidation process (8) Introduction to other thermochemical treatment technologies. New technologies for sludge treatment and disposal. With the strengthening of environmental protection and people’s further understanding of the limitations of existing sludge treatment and disposal technologies, countries all over the world are investing heavily Research and develop new technologies and strive to find a more economical and reasonable sludge treatment plan. The sludge dewatered by the lime dosing technology enters the hopper, and lime and aminosulfuric acid are added to the hopper. The lime dosage is 10%-15% of the wet mud amount, and the aminosulfuric acid dosage is about 1% of the lime dosage.

The water content of the sludge in the municipal sewage plant is too high (about 98%), and the amount of production is extremely large, making sludge dewatering a necessary link for reduction and subsequent treatment. The main sludge dewatering technology currently in use, the water content of the mud cake is as high as About 80%, not only the reduction effect, but also the technical scope of sludge treatment-sludge treatment and the chamber filter press
Since aminosulfuric acid generates ammonia gas during the reaction, the sterilization effect of the entire process is enhanced and the reaction temperature is reduced. After the sludge, quicklime and aminosulfuric acid are stirred in the hopper, they are pushed into the feed port of the plunger pump by the double screw feeder, and then sent to the reactor through the plunger pump. They stay at 70°C for 30 min. The output product can be It meets the CLASS A standard of US EPA PART503 reclaimed water. The reacted sludge is pumped to the silo, and the gas generated in the sealed container is treated by the scrubber and discharged. The characteristics of the process: pH>12, long duration, complete sterilization; high pH precipitates most of the metal ions, reducing their solubility and activity; the solid content of sludge can be increased to 30% sludge concentration; Odor in the sludge, the system is fully sealed, and there is no environmental pollution; the system is fully automatic, and the operation and maintenance are simple: adding a small amount of aminosulfuric acid reduces the amount of lime and the reaction time, and reduces the operating cost. Sludge carbonization technology. The so-called sludge carbonization is a process in which the water in the sludge is released through certain means, while at the same time the carbon value in the sludge is retained to a large extent, so that the carbon content in the final product is greatly increased. (Sludge Carbonization o In the world, there are three main types of sludge carbonization. (1) High-temperature carbonization. No pressure is applied during carbonization, and the temperature is 649-982°C. First, the sludge is dried to a moisture content of about 30%. Then enter the carbonization furnace for high-temperature carbonization and granulation. The carbonized particles can be used as low-grade fuels, and their calorific value is about 8 360-12 540 kJ/kg (Japan or the United States). Technically mature companies include Japan’s Ebara, Mitsubishi Heavy Industries, Pakistani Industry and IES in the United States, etc. This technology can achieve sludge reduction and resource utilization, but due to its complex technology, high operating cost, and low calorific value in the product, it has not yet been applied on a large scale. The scale is 30% wet sludge. (2) Intermediate temperature carbonization. The temperature is 426-537°C without pressure during carbonization. First, the sludge is dried to a moisture content of about 90%, and then it is decomposed in a carbonization furnace. Produced in the process Oil, reaction water (steam condensate), biogas (uncondensed air) and solid carbides. The representative of this technology is Australia ESI Company. The company has built a 100t/d treatment plant in Australia. This technology can be realized. The reduction and resource utilization of sludge are difficult to use because the final products of sludge are too diversified. In addition, this technology carbonizes the sludge after drying, and its economic benefits are not obvious. Outside the treatment plant, there are currently no other potential users. (3) Low-temperature carbonization. There is no need to dry before carbonization. During carbonization, it is pressurized to 6-8 MPa, and the carbonization temperature is 315℃. After carbonization, the sludge becomes liquid and after dehydration The water content of the sludge is below 50%, and it can be used as low-grade fuel after drying and granulation. Its calorific value is about 15 048-20 482 kJ/kg (U.S.). This technology makes the biomass in the sludge by heating and pressurizing All pyrolysis, 75% of the water in the sludge can be removed only by mechanical methods, which greatly saves energy consumption during operation. All sludge pyrolysis ensures the complete stability of the sludge. The sludge carbonization process retains absolute The calorific value of most of the sludge creates conditions for the reuse of energy after cracking 14t. The sludge hydrolysis thermal drying technology sludge hydrothermal drying technology heats the sludge to make the sludge in a certain temperature and pressure The viscous organic matter is hydrolyzed to destroy the colloidal structure of the sludge, which can improve the dehydration performance and anaerobic digestion performance at the same time. With the increase of the hydrothermal reaction temperature and pressure, the particle collision increases, and the collision between the particles leads to the destruction of the colloidal structure. Separation of bound water and solid particles. The water content of mechanically dewatered sludge after hydrothermal treatment is greatly reduced without adding flocculants. The hydrolysis of sludge is macroscopically manifested as a reduction in the concentration of volatile suspended solids and COD, BOD and ammonia nitrogen Equal concentration increases. The hydrothermal drying technology adopts a slurry reactor, which improves the performance of the system by flashing exhausted steam back-mixing and preheating the slurry, steam and mechanical stirring. In the hydrothermal reactor, the direct mixing and heating method of steam countercurrent flow is adopted to enhance the mass and heat transfer process and avoid local overheating, coking and carbonization: in the continuous flash reactor, the effective recovery of system energy is realized old.

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