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Short-cut denitrification method to promote the removal of total nitrogen in wastewater

A technology of short-range denitrification and short-range nitrification, which is applied in the field of wastewater treatment and can solve problems such as failure to meet discharge standards

Active Publication Date: 2021-09-14
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in theory, the short-cut nitrification-anammox process can only remove 89% of the total nitrogen. For the anaerobic treatment effluent with high nitrogen and low carbon, after the short-cut nitrification-anammox process, it still contains Higher concentration of total nitrogen, mainly nitrate nitrogen, cannot meet the increasingly stringent discharge standards and needs further treatment

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  • Short-cut denitrification method to promote the removal of total nitrogen in wastewater

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Embodiment 1

[0037] A method for short-range denitrification to promote the removal of total nitrogen from wastewater, comprising the steps of:

[0038] (1) High ammonia nitrogen wastewater enters the pre-treatment unit for anaerobic digestion to remove organic matter and generate biogas;

[0039] (2) The effluent from anaerobic digestion enters the short-range nitrification-ANAMMOX denitrification unit, and ammonia nitrogen and most of the total nitrogen are removed in the short-range nitrification-ANAMMOX denitrification unit;

[0040](3) The effluent from the short-cut nitrification-ANAMMOX denitrification unit enters the sulfur reduction short-cut denitrification unit from the top of the reactor. The unit is inoculated with sludge, and biogas is introduced from the bottom of the reactor to control the volume of biogas and the unit’s influent water Compare;

[0041] (4) Part of the effluent from the sulfur reduction short-range denitrification unit is returned to the short-range nitrif...

Embodiment 2

[0060] The high ammonia nitrogen wastewater biological denitrification system involved in the present invention is composed of a pretreatment unit, a short-range nitrification-ANAMMOX denitrification unit, a sulfur reduction short-range denitrification unit, and a post-treatment unit. After the treatment unit removes organic matter to produce biogas, it enters the short-range nitrification-ANAMMOX denitrification unit. After the ammonia nitrogen and most of the total nitrogen are removed in the short-range nitrification-ANAMMOX denitrification unit, the effluent enters the sulfur reduction short-range denitrification unit, and the sulfur reduction Part of the effluent from the short-range denitrification unit flows back to the short-range nitrification-ANAMMOX denitrification unit, and the remaining effluent enters the post-treatment unit for advanced treatment. The effluent from the post-treatment unit is discharged after reaching the discharge standard. The denitrification un...

Embodiment 3

[0077] This embodiment further illustrates the present invention in conjunction with the accompanying drawings.

[0078] The high ammonia nitrogen wastewater biological denitrification system consists of a pretreatment unit 1, a short-cut nitrification-anammox denitrification unit 2, a sulfur reduction short-range denitrification unit 3 and a post-treatment unit 4 connected in sequence.

[0079] (1) High-nitrogen and high-concentration organic wastewater enters the pre-treatment unit 1 for anaerobic digestion to remove organic matter and generate biogas.

[0080] (2) The effluent from anaerobic digestion enters the short-cut nitrification-anammox denitrification unit 2, and the short-cut nitrification and anammox sludge are cultivated. footwork. Under the action of nitrifying microorganisms, O 2 oxidized NH 4 +generate NO 2 - , under the action of anammox microorganisms, NO 2 – oxidized NH 4 + Nitrogen (N 2 ) and NO 3 - .

[0081] (3) The effluent from the short-...

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Abstract

The invention discloses a method for short-range denitrification to promote the removal of total nitrogen in wastewater. High-ammonia nitrogen wastewater passes through a pretreatment unit to remove organic matter to produce biogas, and then enters a short-range nitrification-anammox denitrification unit to remove ammonia nitrogen and most of the total nitrogen. The effluent enters the sulfur reduction short-range denitrification unit, and feeds biogas to convert nitrate nitrogen into nitrite nitrogen. Part of the effluent from the sulfur reduction short-range denitrification unit flows back to the short-range nitrification-anammox denitrification unit to continue the anammox reaction The total nitrogen is further removed, and the remaining effluent enters the post-treatment unit for advanced treatment. The effluent of the post-treatment unit meets the discharge standard and is discharged. The advantages of the present invention are: high removal rate of total nitrogen in anaerobic digestion effluent, simultaneous denitrification of wastewater and biogas desulfurization, complete autotrophic denitrification, biogas desulfurization without oxygen addition, and operating costs of the entire wastewater denitrification and biogas desulfurization system Low.

Description

technical field [0001] The invention relates to a short-range denitrification method using hydrogen sulfide in biogas as an electron donor to promote the removal of total nitrogen in wastewater, which belongs to the field of wastewater treatment and is suitable for livestock and poultry breeding wastewater, high-nitrogen and high-concentration industrial organic wastewater, landfill leachate, Denitrification and biogas desulfurization of biogas slurry produced by anaerobic digestion of excess sludge in urban sewage plants. Background technique [0002] Livestock and poultry breeding wastewater, high-nitrogen and high-concentration industrial organic wastewater, landfill leachate, and residual sludge from urban sewage plants generally use anaerobic digestion to remove organic matter and produce biogas. Denitrification treatment is required before. For high-nitrogen and low-carbon wastewater, traditional biological denitrification mainly adopts nitrification-denitrification m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/28B01D53/84B01D53/52C02F101/16C02F101/38
CPCB01D53/52B01D53/84B01D2258/05C02F3/286C02F3/307C02F2101/16C02F2101/38Y02W10/10Y02A50/20
Inventor 邓良伟陈子爱
Owner BIOGAS SCI RES INST MIN OF AGRI
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