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Method for rapidly starting up-flow reactor through denitrification

A rapid start-up and reactor technology, applied in anaerobic digestion treatment and other directions, can solve the problems of long start-up period, loss, and no granular sludge, and achieve the effect of eliminating sludge floating.

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the application of this technology, the start-up of the up-flow reactor is an important issue
The common start-up method is: use the anaerobic domesticated granular sludge as the seed sludge to start the upflow reactor, or start the denitrification reaction after the upflow reactor completes the anaerobic reaction start. The former method There is a defect that the source of seed mud is limited by the market supply, and the latter has a too long start-up period
[0004] Through laboratory experiments, it is found that in the process of directly starting the upflow reactor with flocculent sludge, there are problems of flocculent sludge agglomeration, floating, and loss with the effluent
[0005] 200910200765.9 also needs to pretreat the flocculent seed mud, but it is still necessary to add air blowing internal components to the upflow reactor and use the water inlet pipe to enter the air facility, so that it can be started smoothly, which may be mainly due to the upflow reactor or the plastic The degree of pretreatment in the shed is not enough to solve the problem of flocculent sludge floating
However, generally speaking, the granular sludge floats up and flows out with the water, mainly because there are air bubbles on the surface or inside of the particles, and the air bubbles are easily separated from the granular sludge in the water flow to become sludge that can sink, and the patent does not give how to cultivate it into a sludge that can sink. Granular sludge that has been floating
[0008] The above problems limit the application of upflow reactor in denitrification reaction in industry

Method used

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Examples

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Effect test

Embodiment 1

[0114] Use the dehydrated residual sludge of the municipal sewage treatment plant as the seed sludge of denitrification sludge, domesticate it into denitrification sludge through the wastewater containing nitrite nitrogen, and start the upflow reactor.

[0115] The volume of the stirred tank is 1 / 3 times the volume of the upflow reactor. Add the influent water used for acclimating the seed mud into the stirring tank, the pH is 6.5; turn on the stirrer, and the rated stirring power is 40W / m 3 , the stirring speed is set to 500 rpm; add sodium nitrite to the stirring tank; add the suspension containing ferric hydroxide; add the remaining sludge after dehydration in the municipal sewage treatment plant, and measure its moisture content in the range of 78-85 %, its addition method is: mix the residual sludge after dehydration that has been stored for no more than 3 days into the influent water used for the domesticated seed sludge, and pump it into the mixing tank through the slud...

Embodiment 2

[0119] The mixture of digester sludge of municipal sewage treatment plant and sludge discharged from anaerobic reactor is used as denitrification sludge seed sludge, which is domesticated into denitrification sludge by wastewater containing nitrate nitrogen, and the upflow reactor is started.

[0120] The volume of the stirred tank is twice the volume of the upflow reactor. Add the influent water used for the domestication seed mud into the stirring tank; add 8wt% sodium nitrate solution to the stirring tank; turn on the stirrer, and the stirring power is 30W / m 3 , the stirring speed is 100 rev / min; add the liquid mixture containing methanol and ethanol to the stirring tank; add the wastewater containing ferric chloride; add sodium bicarbonate solution to adjust its pH to 6.5; add the digester sludge of the municipal sewage treatment plant The mixture with the sludge discharged from the anaerobic reactor; after the mud water in the stirring tank is evenly mixed, the total unfi...

Embodiment 3

[0124] Use the mixture of residual sludge from municipal sewage treatment plants and sludge from aeration tanks of industrial wastewater treatment plants as denitrification sludge seed sludge to domesticate denitrification sludge through wastewater containing nitrate nitrogen and nitrite nitrogen, and start the upflow reactor .

[0125] The volume of the stirring tank is 3 times the volume of the upflow reactor, and the feed water used for domestication seed mud is added to the stirring tank; the stirrer is turned on, and the stirring power is 30W / m 3 , the stirring speed is 20 rpm; add a solid mixture containing sodium formate and sodium ethoxide to the mixing tank; add ferrous sulfate powder, add sodium carbonate solution to adjust its pH to 8; add residual sludge and industrial wastewater from municipal sewage treatment plants Sludge in the aeration tank of the treatment plant; after the mud and water in the mixing tank are evenly mixed, the total non-filterable residue in ...

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Abstract

The invention relates to a method for rapidly starting an up-flow reactor through denitrification, which is characterized in that seed sludge of denitrification sludge in a stirring pool outside the up-flow reactor is acclimated to the denitrification sludge, then the denitrification sludge is introduced in the up-flow reactor, the inlet water is introduced in the up-flow reactor, the up-flow reactor is rapidly started for a denitrification reaction; and the stirring pool is a mechanical stirring pool with a mixer. According to the invention, seed sludge of denitrification sludge in the stirring pool outside the up-flow reactor is acclimated to the denitrification sludge, then the denitrification sludge is introduced in the up-flow reactor, then the up-flow reactor is rapidly started, and the problems of floatation and loss of flocculent sludge generated at an initial stage for starting the up-flow reactor can be solved.

Description

technical field [0001] The invention relates to biological treatment of waste water or sewage, in particular to a method for quick start of denitrification in an upflow reactor. In particular, it refers to a method for quickly starting the denitrification reaction in the reactor when the biochemical wastewater containing organic matter is subjected to denitrification biological treatment in the upflow reactor. Background technique [0002] Upflow reactors (upflow anaerobic reactors) are generally used in the field of high-concentration organic matter treatment. In recent years, experiments have found that adding nitrate to the system will also cause denitrification reactions, so upflow reactors can be used Reactor for denitrification reaction. Denitrification reactions also occur in anoxic ponds that treat municipal sewage in anoxic-aerobic manner. [0003] However, in the application of this technology, the start-up of the upflow reactor is an important problem. The comm...

Claims

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Application Information

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IPC IPC(8): C02F3/28
Inventor 高凤霞程学文王珺张宾莫馗李海龙
Owner CHINA PETROLEUM & CHEM CORP
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