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A biochemical tail water biological denitrification method to inhibit the expansion of non-filamentous bacteria

A technology of biological denitrification and filamentous bacteria, applied in chemical instruments and methods, sustainable biological treatment, special compound water treatment, etc., can solve problems such as turbid water quality, high water pressure, engineering paralysis, etc., and achieve effective COD degradation , biological denitrification synergistically COD degradation, the effect of avoiding the expansion of non-filamentous bacteria

Active Publication Date: 2020-07-24
江苏南大华兴环保科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sludge in the intermediate tank enters the subsequent denitrification / nitrification bioreactor with the hydraulic scouring and lifting pump, which further causes the filler in the reactor to further stick and agglomerate due to the adsorption of viscous bacterial micelles, resulting in high water pressure and the grid in the reactor. The local pressure was too high and then damaged, which caused the filling in the reactor to float up and the project was paralyzed
On the other hand, the factor of nutritional imbalance will run through the whole process, not only in the middle tank, there will be non-filamentous bacteria expansion, but also in the denitrification / nitrification biological filter effluent weir. The nitrification effluent only needs to carry sludge Scum caused by non-filamentous bacteria will be formed in the subsequent pool body, the water quality will be turbid, and the water quality cannot be guaranteed to meet the discharge standard

Method used

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  • A biochemical tail water biological denitrification method to inhibit the expansion of non-filamentous bacteria

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Experimental program
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Effect test

Embodiment 1

[0034] A biochemical tail water biological denitrification method for inhibiting the expansion of non-filamentous bacteria in this embodiment comprises the following steps:

[0035] 1. Enter the biochemical tail water (secondary sedimentation tank) into the inclined tube sedimentation tank to further remove SS (suspended solids); the water quality of the biochemical tail water (secondary sedimentation tank) is: CODcr (carbon content) ≤ 80mg / L, TN ≤ 120mg / L, of which NO 3 -N accounts for more than 90%; CODcr (carbon content) is: 69 among the present embodiment; TN is: 116; NO 3 -N is 101; TP is 1 mg / L.

[0036] 2. The effluent of the inclined tube sedimentation tank flows automatically to the nutrient balance tank, and phosphorus is added; according to the water quality, water quantity and NO 3 -N concentration calculation carbon source dosage is 303mg / L (taken=3), and potassium dihydrogen phosphate is added 6.6mg / L based on the total amount of carbon source (deducting the bo...

Embodiment 2

[0042] This embodiment is basically the same as embodiment 1, and the concrete steps are

[0043] 1. Enter the biochemical tail water (secondary sedimentation tank) into the inclined tube sedimentation tank to further remove SS (suspended solids); CODcr (carbon content) in this embodiment is: 56mg / L; TN is: 112mg / L; NO 3 -N is 98 mg / L; TP is 0.5 mg / L.

[0044] 2. The effluent of the inclined tube sedimentation tank flows automatically to the nutrient balance tank, and phosphorus is added; according to the water quality, water quantity and NO 3 -N concentration calculation carbon source dosage is 392mg / L (taking n=4), adding disodium hydrogen phosphate 8mg / L based on the total amount of carbon source (deducting the body value of phosphorus in water body 0.5mg / L).

[0045] 3. The effluent from the nutrient balance pool is pumped into the denitrification biological filter; the bottom of the filter is pumped into the supplementary carbon source through the pipeline mixer. The car...

Embodiment 3

[0050] 1. Enter the biochemical tail water (secondary sedimentation tank) into the inclined tube sedimentation tank to further remove SS (suspended solids); CODcr (carbon content) in this embodiment is: 62mg / L; TN is: 120mg / L; NO 3 -N is 115 mg / L; TP is 0.4 mg / L.

[0051] 2. The effluent of the inclined tube sedimentation tank flows automatically to the nutrient balance tank, and phosphorus is added; according to the water quality, water quantity and NO 3 -N concentration calculation carbon source dosage is 288mg / L (taking n=2.5), adding sodium dihydrogen phosphate 4.6mg / L based on the total carbon source calculation (deducting the body value of phosphorus in the water body is 0.4mg / L).

[0052] 3. The effluent from the nutrient balance pool is pumped into the denitrification biological filter; the bottom of the filter is pumped into the supplementary carbon source through the pipeline mixer. The carbon source is sodium acetate, methanol and other easily degradable small molec...

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Abstract

The invention discloses a biochemical tail water biological denitrification method for inhibiting non-filamentous bacterium expansion, and belongs to the technical field of industrial wastewater biochemical tail water denitrification treatment. The method comprises the following steps: precipitating nitrogen-containing wastewater, introducing the wastewater into a nutrition balancing tank, addinga phosphorus source, introducing the wastewater into a denitrification nitrogen removal reactor, and adding a carbon source into the nitrogen removal reactor for nitrogen removal. According to the method, the balance of nutritions can be ensured, so that non-filamentous bacterium expansion is not generated, the non-filamentous bacterium expansion caused by consumption of a carbon source by trace activated sludge in the nutrition balancing tank is effectively avoided, and meanwhile, the purpose of effective biological denitrification in cooperation with COD degradation is achieved.

Description

technical field [0001] The invention belongs to the technical field of biochemical tail water denitrification treatment of industrial wastewater, and more specifically relates to a biochemical tail water biological denitrification method for inhibiting the expansion of non-filamentous bacteria. Background technique [0002] In the area of ​​human activities, the nitrogen cycle has been seriously disturbed, resulting in an unprecedented increase of reactive nitrogen in the biosphere, resulting in nitrogen pollution, which poses a threat to humans and the environment. According to the 2017 Bulletin on the State of the Ecological Environment in China issued by the Ministry of Ecology and Environment in 2018, it can be seen that the proportion of monitoring points with poor and extremely poor groundwater quality in the country accounted for 66.6%, of which "three nitrogen" (NO 2 - -N, NH 4 + -N and NO 3 - -N) The pollution situation is serious. Excessive nitrogen content i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/12C02F9/14
CPCC02F1/52C02F1/5281C02F1/56C02F3/12C02F3/34C02F9/00C02F2001/007C02F2209/08C02F2209/10C02F2209/14C02F2209/15C02F2209/16C02F2209/22C02F2305/06Y02W10/10
Inventor 赵选英王智宁李栋潘兴华杨峰蔡国飞戴建军
Owner 江苏南大华兴环保科技股份公司