Short-term hunger based method for denitrification and denitrification biofilter system

A biological filter and denitrification technology, applied in chemical instruments and methods, special compound water treatment, biological water/sewage treatment, etc., can solve problems such as chemical oxygen demand not up to standard, achieve strong consumption capacity, and improve denitrification Efficiency, the effect of solving the problem that the effluent COD cannot reach the standard stably

Active Publication Date: 2020-02-04
SUZHOU IND PARK QINGYUAN HUAYAN WATER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for denitrification based on short-term starvation and a denitrification biological filter system to solve the problem that the chemical oxygen demand (COD) does not reach the standard when the denitrification is complete during the denitrification process

Method used

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  • Short-term hunger based method for denitrification and denitrification biofilter system
  • Short-term hunger based method for denitrification and denitrification biofilter system
  • Short-term hunger based method for denitrification and denitrification biofilter system

Examples

Experimental program
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Effect test

Embodiment 1

[0052]The sludge from the aeration tank of a sewage treatment plant in Suzhou was used as the inoculation sludge, and the film was hanged according to step S1, wherein the dosage of sodium acetate and sodium nitrate was 621mL / d (4.6%) sodium acetate solution and 780mL / d respectively. (3.5%) sodium nitrate solution. Stable operation for 15 days after the completion of film formation, during which the TN concentration in the effluent was 1.09-1.55mg / L, and the removal rate was 83.0%-88.0%; the effluent NO 3 - The -N concentration is 0.26-1.11 mg / L, and the removal rate is 86.2%-97.7%.

[0053] Then close the first carbon pump 6 or the second carbon pump 7 in the denitrification biological filter system, so that the denitrifying bacteria are in a starvation state. After 48 hours, reopen the closed carbon pump and open the originally closed carbon pump. Still add sodium acetate solution according to the COD / TN ratio of 5, and then detect the change of COD and nitrogen in the inf...

example 2

[0056] The test conditions and process are the same as Example 1, the difference is that the dosage of sodium acetate is reduced after 48 hours of starvation, and the dosage is carried out according to the COD / TN of 3.5. The test results are as follows Figure 4 , Figure 5 and Figure 6 As shown, among them, Figure 4 It is a control chart of the change of chemical oxygen demand concentration before and after starvation; Figure 5 It is the control chart of the change of TN concentration in the effluent before and after starvation; Figure 6 It is the control chart of the change of nitrate nitrogen concentration before and after starvation. After short-term starvation, the same denitrification effect can still be obtained by reducing the dosage of organic matter by 30%. Depend on Figure 4 It can be seen that after the short-term starvation treatment, the dosage of organic matter is reduced, and the COD concentration in the effluent water is reduced by 3-8mg / L compared w...

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Abstract

The invention relates to the technical field of sewage treatment and provides a short-term hunger based method for denitrification and a denitrification biofilter system. The method comprises the steps: subjecting a first denitrification biofilter and a second denitrification biofilter to inoculated biofilm formation separately, and carrying out stable operation for a plurality of days after biofilm formation is completed; and connecting the first denitrification biofilter and the second denitrification biofilter in series, enabling sewage to enter the two denitrification biofilters in an alternate reversing manner, only supplying carbon to the denitrification biofilter, through which fluid firstly passes, and carrying out stable operation for a plurality of hours. According to the short-term hunger based method for denitrification, provided by the invention, the two filters are connected in series, and operation is carried out in an alternate water entering / exiting manner, so that alternate operating of a short-term hunger state and a nutrition recovering state is achieved; and activity of denitrifying bacteria is excited in the short-term hunger state, and higher consumption capability is shown after a carbon source is added again, so that the problem that COD of effluent cannot stably reach standards due to the fact that the carbon source is introduced excessively when denitrification is complete is settled.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a denitrification method based on short-term starvation and a denitrification biological filter system. Background technique [0002] Microorganisms in activated sludge or biofilm have evolved various starvation coping mechanisms in order to ensure the long-term maintenance of cells when faced with harsh starvation environments. Survival of the fittest, with the more resilient microbes surviving and multiplying in response to starvation. At the same time, adding nutrients after short-term starvation will stimulate the activity of microorganisms, so that microorganisms will show stronger consumption ability when they regain food. [0003] Denitrification biological filter is a common and effective three-stage denitrification process. Denitrifying bacteria use organic matter as electron acceptors, and nitrate nitrogen (NO 3 - -N) Synthesize energy needed in life activi...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16C02F101/30
CPCC02F3/286C02F2101/16C02F2101/30C02F2305/06
Inventor 叶星关永年刘玉红黄俊生马凯迪徐锡梅董晓晨
Owner SUZHOU IND PARK QINGYUAN HUAYAN WATER
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