Method and system for separating biomass from activated sludge and application

A technology for activated sludge and biomass, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve the problems of difficulty in balancing alkali-heat conditions, reduction of total nitrogen in filtrate, and numerous equipment. Achieve the effect of effectively killing harmful microorganisms, reducing alkaline concentration and reducing energy consumption

Pending Publication Date: 2021-05-25
杨山林 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its current obvious disadvantages: (1) The reaction mechanism is single, completely dependent on alkali-thermal reaction, the efficiency is low, and because of the low temperature difference, the effect of flash breaking the wall is not obvious; (2) The alkali-thermal conditions are difficult to balance, lime and Sludge is added to the reaction vessel separately, completely relying on anchor type or anchor slurry type stirring (low speed) mixing, the uniformity of alkalinity and temperature is restricted; (3) The reaction time is long, after reaching the design temperature, the reaction time reaches 240 minutes, and the reaction The cost and energy consumption of the container are high; (4) the mass percentage of CaO is between 5% and 5.5%, and the nitrogen content in the filtrate is low, which is 2000-2300mg / L. After the solid-liquid separation, excessive lime enters In the mud cake, on the one hand, the pH value of the filtrate is too high, which will damage the crops; on the other hand, the Ca(OH) in the mud cake 2 (5) The reacted material is quenched by "flash evaporation", which has a good quenching effect, but it will cause a large amount of ammonia nitrogen to be released, The formation of odor pollutes the environment and reduces the total nitrogen in the filtrate
In addition, the current flash evaporation process can only quickly reduce the reacted material from 140°C to 100°C, and cannot completely prevent organic nitrogen from continuing to be converted into ammonia nitrogen; (6) The existing process chain is long, the equipment is numerous, and the investment is high , Occupy a large area, relatively complex maintenance and management

Method used

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  • Method and system for separating biomass from activated sludge and application
  • Method and system for separating biomass from activated sludge and application
  • Method and system for separating biomass from activated sludge and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] After the slaked lime thick slurry is filtered through the filter screen, it is pumped into the reaction kettle with a thick slurry pump, and then the slaked lime thick slurry is stirred by a vertical anchor or anchor paddle agitator; after the sludge to be treated is filtered through the filter screen, Use a screw pump to pump into the reaction kettle, and continue to use a vertical anchor or anchor paddle stirrer to stir the mixture to make the stirring more uniform; wherein, the Ca content in the mixture is 3.5% by mass percentage in terms of CaO, and the reaction is heated before Reactor for 90 minutes, so that after the material inside the reactor reaches 140°C, react for 240 minutes. After the reaction is completed, the high-temperature sludge after the reaction is discharged into the rapid-cooling heat exchanger for rapid cooling treatment, and the activated sludge mixture after the high-temperature reaction is cooled to 90°C within 100 seconds for storage and slo...

Embodiment 2

[0071] After the slaked lime thick slurry is filtered through the filter screen, it is pumped into the reaction kettle with a thick slurry pump, and then the slaked lime thick slurry is stirred by a vertical anchor or anchor paddle agitator; after the sludge to be treated is filtered through the filter screen, Use a screw pump to pump into the reaction kettle, and continue to use a vertical anchor or anchor paddle stirrer to stir the mixture to make the stirring more uniform; wherein, the Ca content in the mixture is 3.5% by mass percentage in terms of CaO, and the reaction is heated before Reactor for 90 minutes, so that after the material inside the reactor reaches 140°C, react for 240 minutes. After the reaction is completed, discharge the reacted high-temperature sludge into the quench heat exchanger for quenching treatment, and cool the activated sludge mixture after the high-temperature reaction to 85°C for storage and slow cooling within 110 seconds. The cooled mixture ...

Embodiment 13

[0079]The slaked lime thick slurry is filtered through the filter screen and the activated sludge to be treated is filtered through the filter screen, and then pumped to the mixing port by the thick slurry pump and the screw pump at the same time, and then sent to the static mixer, and the static mixed material enters the The reaction kettle is heated by steam in the jacket of the reaction kettle, wherein the Ca content in the mixture is 2.5% in terms of CaO mass percentage, and the reaction kettle is heated for 90 minutes before the reaction, so that after the internal materials of the reaction kettle reach 140 ° C, the vortex Stir continuously and react for 150min with the linear velocity of the pan stirrer at 0m / s. After the reaction is completed, the high-temperature sludge after the reaction is discharged into the quenching heat exchanger and cooled to 70°C for storage and slow cooling. Finally, the cooled activated sludge is separated from solid and liquid by plate and fr...

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PUM

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Abstract

The invention discloses a method and system for separating biomass from activated sludge and application. The method comprises the following steps: carrying out high-temperature reaction on alkaline thick slurry and activated sludge to be treated, and rapidly cooling the activated sludge mixture after the high-temperature reaction to 60-90 DEG C. Compared with an existing 'flash evaporation' cooling mode, the method has advantages that the temperature after cooling is greatly reduced, and the phenomenon that after the 'flash evaporation' cooling mode is adopted, the materials are further decomposed to generate a large amount of ammonia nitrogen after the reaction is completed, and the ammonia nitrogen is volatilized and separated out to form odor is avoided. Meanwhile, the use of alkaline thick slurry is reduced from the source, so that the alkaline concentration in the mud cake and the filtrate is reduced, the application of the mud cake is expanded, and the damage of the filtrate with overhigh pH to plants is avoided. The low reaction temperature is adopted, and energy consumption is reduced while it is guaranteed that harmful microorganisms are effectively killed. In addition, due to the reduction of the reaction temperature, a large amount of active nitrogen is preserved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method, system and application for separating activated sludge biomass. Background technique [0002] The sludge produced by urban sewage treatment plants has not been effectively treated for a long time, and the problem of environmental pollution has become increasingly prominent; the sanitary landfill and dry incineration treatment methods adopted in recent years not only consume a lot of land and energy, but also still have the risk of polluting the environment. At present, emerging technologies for sludge treatment aimed at improving the efficiency of "recycling" have been produced. For example, using hot alkali hydrolysis method supplemented by flash evaporation to extract substances containing proteins and polypeptides by breaking the wall of microbial cells, and preparing liquid raw materials for use as Agricultural fertilizers. The prior art is described as fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/122
CPCC02F11/00C02F11/122
Inventor 杨山林杨杰周建宁
Owner 杨山林
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