Method for handling heavy metal in sludge

A treatment method and technology for heavy metals, which can be used in dewatering/drying/concentrating sludge treatment, pyrolysis treatment of sludge, sewage/sludge fertilizer, etc. The effect of heavy metals

Inactive Publication Date: 2007-12-05
杨培根
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology and equipment of the incineration method are complicated, energy consumption is high, investment is high, and it is accompanied by air pollution problems; the landfill method is limited by land use; the method of throwing into the sea will pollute the ocean and pose a threat to the marine ecosystem and human food chain. International Convention It has been expressly banned; the composting method occupies a large area, the production cycle is long, t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Pyrolysis process:

[0026] 4 tons of pretreated mud cakes are injected into the pretreatment tank through the mud pump, and then 0.5 tons of straw are added, sent into the pretreatment tank through a conveyor, industrial sulfuric acid is added, and the pH value of the mud is adjusted to 3.05, and then Add 1 kg of nano-scale iron trichloride, after mixing and stirring, add it to the storage tank of the hydrolyzed material. After the feeding is completed, close the inlet and outlet valves, open the inlet valve, and make the pressure reach 1.1Mpa, and the temperature is 150°C. Press for 2 hours, stop stirring 30-45 minutes before discharging, and open the drain valve after the pressure keeping is over, so that the clarified liquid produced by pyrolysis can be directly discharged into the water storage tank. After the liquid discharge is completed, the vent valve can be opened, and the water in the tank at a temperature as high as 150 °C will quickly drop to below 100 °...

Embodiment 2

[0038] A. Pyrolysis process:

[0039] 4 tons of pretreated mud cakes are poured into the pretreatment tank through the mud pump, and then 0.8 tons of straw are added, sent into the pretreatment tank through a conveyor, industrial sulfuric acid is added, and the pH value of the mud is adjusted to 4.15. Add 2 kg of nano-scale iron trichloride, after mixing and stirring, add it to the hydrolyzed material storage tank. After the feeding is completed, close the inlet and outlet valves, and open the inlet valve to make the pressure reach 1.25Mpa and the temperature 190°C. Press for 3 hours, stop stirring 30-45 minutes before discharging, and open the water release valve after the pressure maintaining, so that the clarified liquid produced in the pyrolysis process can be directly discharged into the water storage tank. After the liquid discharge is completed, the vent valve can be opened, and the water in the tank, which is as high as 190°C, will quickly drop to below 100°C due to ev...

Embodiment 3

[0051] A. Pyrolysis process:

[0052]Put 4 tons of pretreated mud cake into the pretreatment tank through the mud pump, then add 1 ton of straw, send it into the pretreatment tank through the conveyor, and add industrial sulfuric acid according to the amount to adjust the pH value of the mud to 4.85 , and then add 5 kg of nano-level aluminum trichloride, after mixing and stirring, add it to the hydrolyzed material storage tank. After the feeding is completed, close the inlet and outlet valves, open the inlet valve, and make the pressure reach 1.25Mpa and the temperature 220°C , hold the pressure for 4 hours, stop stirring 30-45 minutes before discharging, and after the end of the holding pressure, open the drain valve, so that the clarified liquid produced by pyrolysis is directly discharged into the water liquid storage tank, and after the liquid discharge is completed, The vent valve can be opened, and the water in the tank, which is as high as 190°C, will quickly drop to be...

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PUM

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Abstract

The process of treating heavy metals in sludge includes pre-treatment and post-treatment, and the post-treatment includes a pyrolysis step, a spraying and aerating step, a dewatering step, a neutralizing and dewatering step, an ammonia fixing step and a fertilizer producing step. The neutralizing and dewatering step includes adding organic extractant into liquid from the pyrolysis step and the dewatering step until generating no precipitate, filtering, dewatering the filtered liquid to water content lower than 40 %, and feeding the concentrated liquid to the ammonia fixing step. Compared with available technology, the present invention has the advantage of selecting proper efficient extractant for desorbing heavy metals to produce harmless fertilizer.

Description

Technical field: [0001] The invention belongs to the technical field of sludge treatment methods, in particular to the technical field of heavy metal treatment methods in sludge. Background technique: [0002] The sewage treatment process of modern urban sewage treatment plants is divided into two parts: sewage treatment and sludge treatment, and sludge treatment is divided into pre-treatment and post-treatment. The water content is 75-80%, and the post-treatment methods include incineration, landfill, throwing into the sea and composting. The technology and equipment of the incineration method are complicated, energy consumption is high, the investment is high, and it is accompanied by air pollution problems; the landfill method is limited by land use; the sea throwing method will pollute the ocean and pose a threat to the marine ecosystem and human food chain. International Convention It has been expressly prohibited; the composting method occupies a large area, the produ...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C05F7/00
CPCY02A40/20Y02W10/40
Inventor 杨培根程张红陆际文姬亮昝向明荀小牛
Owner 杨培根
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