Method for eliminating organic pollutants and stabilizing heavy metals based on sludge hydrothermal treatment
A technology for organic pollutants and heavy metals, which is applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. It can solve the problems of involuntary discharge of waste liquid and harshness, and achieve good stability and treatment costs. The effect of reducing and reducing costs
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Embodiment 1
[0022] The dewatered sludge is taken from a sewage treatment plant in Shanghai. The moisture content of the sewage is 80.76%. The sludge is first stirred to make it homogenized, and the dewatered sludge is added to figure 1 In the high-pressure reactor, the material in the reactor is heated to 120°C to drive away the air in the reactor. During the reaction, the entire reactor is kept in a closed state, and electric heating is used to raise the temperature of the material to reach the set 270°C , keep warm for 45min, then pass in cooling water to cool down the system, release the material and carry out solid-liquid separation, and dry the obtained sludge hydrothermal charcoal, in which the degradation rate of polybrominated diphenyl ethers has reached more than 90%; the original dewatered sludge and sludge The leaching results of typical heavy metals in muddy hydrothermal charcoal are shown in Table 1. It can be seen that the leaching of typical heavy metals after sludge hydroth...
Embodiment 2
[0026] The soil taken from an electronic waste dismantling area in Zhejiang is mixed with the dewatered sludge of a sewage plant at a ratio of 1:1. The water added is pure water three times its own quality or filtered fresh water from rivers and rivers. Stir After evenly forming the sludge, soil / water mixture, add the mixed iron salt material mixed by green vitriol and ferric sulfate to the mixture, the addition of iron salt is to make the quality of iron be 5% of the solid waste quality, After stirring evenly to form a sludge and soil / water mixture, the mixture was added to the same high-pressure reactor as in Example 1, and the materials in the reactor were heated to 120°C to drive away the air in the reactor. During the reaction, Keep the whole reaction kettle in a closed state, use electric heating to heat up the material, reach the set 290 ° C for 45 minutes, stop the heat preservation, and then pass cooling water into the cooling coil in the reaction kettle to cool the sy...
Embodiment 3
[0028] The dioxin toxic equivalent in the semi-dry fly ash collected from a grate type waste incinerator filter bag filter in Suzhou is 0.6288ngI-TEQ / g, which is mixed with the dewatered sludge of a sewage plant at a ratio of 1:1 , the added water is pure water 3 times its own quality or filtered fresh water from rivers and rivers. After stirring evenly to form a sludge, fly ash / water mixture, add green vitriol and ferric sulfate to the mixture. The mixed iron salt material, the addition of iron salt is to make the quality of iron be 5% of solid waste quality, after stirring to form sludge, fly ash / water mixture, the mixture is joined to the high pressure reaction identical with embodiment 1 In the kettle, heat the material in the reactor to 120°C to drive away the air in the reactor. During the reaction, keep the entire reactor in a closed state, and use electric heating to raise the temperature of the material to reach the set 290°C for 45 minutes. Stop the heat preservation...
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