Method for multiphase catalytic ozone treatment of residual activated sludge

A technology for residual activity and ozone treatment, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of long treatment process and secondary pollution, and achieve low operating cost and no secondary pollution Second pollution, best ozone utilization effect

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this invention, ozone oxidation is only a means of pretreatment of sludge. Although it can destroy the cell wall and cell membrane of sludge, it needs anaerobic digestion to completely reduce the sludge. The treatment process is long and easy to cause Secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Solid aluminum chloride was added to distilled water while heating and stirring until dissolved to obtain solution (a). Add an appropriate amount of distilled water to the concentrated ammonia water and dilute it into about 10wt% dilute ammonia water (b). Add the powdered coconut shell charcoal to the glucose aqueous solution and mix evenly, the liquid-solid volume ratio is 3:1, then add water and make a slurry to obtain the slurry (c). After adding (a) into the gelling tank and stirring and heating to 60°C, open the valve of the container containing (b), and control the system in the tank to drop to pH=4.0 within 10 minutes, then add (c), continue to add (b) dropwise, and control the dropwise addition of the tank system to pH=8.0 within 30 minutes. Keep the temperature at 60°C, pH=8.0, age for 1 hour, filter the material in the tank, wash until there is no chloride ion, filter, dry the filter cake at 110°C for 10 hours to obtain carrier material A-1, and then Calcined...

Embodiment 2

[0031] Solid aluminum sulfate was added to distilled water while heating and stirring until dissolved to obtain solution (a). Add an appropriate amount of distilled water to the concentrated ammonia water and dilute it into about 10wt% dilute ammonia water (b). Add the powdered coconut shell charcoal into the sucrose aqueous solution and mix evenly, the liquid-solid volume ratio is 3:1, then add water and make a slurry to obtain the slurry (c). Take a glue tank, put 2L of deionized water into it, stir and heat it to 60°C, then add the slurry (c), open the valve of the container containing (a) and (b) at the same time, control the pH of the system to 8.0, and control it for 45 minutes After dripping (a) inside, close the valve. Keep the temperature at 60°C, pH=8.0, age for 1 hour, filter the material in the tank, wash until there is no sulfate ion, filter, and dry the filter cake at 110°C for 10 hours to obtain carrier material A-2, then in Calcined at 550° C. for 5 hours und...

Embodiment 3

[0035] Solid aluminum chloride was added to distilled water while heating and stirring until dissolved to obtain solution (a). Add an appropriate amount of distilled water to the concentrated ammonia water and dilute it into about 10wt% dilute ammonia water (b). Add powdered coconut shell charcoal to glucose aqueous solution and mix evenly, the volume ratio of liquid to solid is 3:1, then add water to make a slurry to obtain activated carbon slurry (c). After adding (a) into the gelling tank and stirring and heating to 60°C, open the valve of the container containing (b), and control the system in the tank to drop to pH=4.0 within 10 minutes, then add (c), continue to add (b) dropwise, and control the dropwise addition of the tank system to pH=8.0 within 30 minutes. Keep the temperature at 60°C, pH=8.0, age for 1 hour, filter the material in the tank, wash until there is no chloride ion, filter, dry the filter cake at 110°C for 10 hours to obtain carrier material A-3, and the...

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Abstract

The invention discloses a method for multiphase catalytic ozone treatment of residual activated sludge, wherein the method comprises the steps: (1) adding an ozone catalyst into a sludge concentration tank, wherein the ozone catalyst comprises a carrier and active metal components loaded on the carrier, a transition metal and a rare earth metal are used as the active metal components, the transition metal is selected from non-noble metals of fourth and fifth periods of the periodic table of elements, the carrier takes 150-300 mesh activated carbon as a core and amorphous alumina as a shell, the amount of the activated carbon accounts for 10%-70% of the weight of the carrier, and the amount of alumina accounts for 30%-90% of the weight of the carrier; (2) introducing ozone into the sludge concentration tank of the step (1), and making the sludge decomposed; and (3) carrying out solid-liquid separation of the sludge after treatment in the step (2), and removing water. By adding the ozone catalyst into the conventional sludge concentration tank, uniform mixing is performed, then ozone is introduced, organic matters in the sludge can be quickly destroyed and decomposed, and the sludge quality and volume are effectively reduced; and the method is economical and practical, and easy to operate and manage, and has no secondary pollution.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a method for treating excess activated sludge by utilizing the combined action of ozone and a catalyst. The method can be widely used in the treatment of surplus activated sludge in sewage treatment plants. Background technique [0002] The activated sludge process is by far one of the most widely used sewage biological treatment technologies in the world, but the surplus activated sludge it produces will cause direct or potential pollution to the environment, so the treatment and disposal of surplus activated sludge is of great significance. Strong necessity. The output of excess activated sludge is relatively large, generally accounting for 0.5wt%-1wt% of the sewage treatment volume (based on water content of 99.5wt%). At the same time, the investment and operating costs of activated sludge treatment are huge, accounting for 25%-65% of the investment and opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 马宁张蕾蒋广安郭宏山李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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