Aerobic biological nitrogen removal process for waste water containing high ammonia-nitrogen

An aerobic biological, high ammonia nitrogen technology, applied in the field of aerobic biological denitrification process, can solve the problems of inability to achieve complete denitrification, long time-consuming, and short start-up time, and achieve shortened start-up time, short start-up time, and engineering Practical effect

Inactive Publication Date: 2016-02-24
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the technical defects that the existing anammox denitrification process cannot achieve complete denitrification and takes a long time, an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The aerobic biological nitrogen removal process for high ammonia nitrogen wastewater in this example is to add zero-valent iron to the aeration reactor for treating high ammonia nitrogen wastewater. The molar ratio of zero-valent iron dosage to ammonia nitrogen concentration is 14.3:1, which will be good Aerobic or anaerobic sludge was added to the aeration reactor as inoculum sludge; the pH value of high ammonia nitrogen wastewater was adjusted to 7.5, at 35 o C, high ammonia nitrogen wastewater stays in the reactor for 3 days, and then enters the next treatment process.

[0025] Zero valent iron is iron powder. The inoculum sludge was nitrifying sludge. The ammonia nitrogen concentration of high ammonia nitrogen wastewater is 350mgN / L, the dosage of zero-valent iron is 20gFe / L, and the dissolved oxygen concentration is 0.3~0.5mg / L.

[0026] In this example, the removal rate of ammonia nitrogen can reach 87.53%, the removal rate of total nitrogen can reach 79.55%, an...

Embodiment 2

[0028] In this example, the inoculation sludge is nitrification sludge, the high ammonia nitrogen wastewater is pig farm wastewater anaerobic digestion solution, the ammonia nitrogen concentration is 500mgN / L, and the zero-valent iron is iron shavings. The molar ratio of zero-valent iron dosage to ammonia nitrogen concentration The ratio is 10:1, the dosage of zero-valent iron is 20gFe / L, the pH value of the high-ammonia nitrogen wastewater is 7.6, and the high-ammonia nitrogen wastewater stays in the reactor for 5 days before being discharged up to the standard. All the other are the same as embodiment one.

[0029] In this example, the removal rate of ammonia nitrogen can reach 98.47%, the removal rate of total nitrogen can reach 95.26%, and the volume removal load can reach 0.259kgN / (m 3 d).

Embodiment 3

[0031] In this example, the inoculation sludge is nitrification sludge and anammox sludge, high ammonia nitrogen wastewater is pig farm wastewater anaerobic digestion solution, ammonia nitrogen concentration is 400mgN / L, zero-valent iron is iron shavings, zero-valent iron is added The molar ratio of ammonia nitrogen concentration to ammonia nitrogen concentration is 12.5:1, the dosage of zero-valent iron is 20gFe / L, the pH value of high ammonia nitrogen wastewater is 7.4, and the dissolved oxygen concentration is 0.3~0.4mg / L. The rest are the same as in Example 2.

[0032] In this example, the removal rate of ammonia nitrogen can reach 95.14%, the removal rate of total nitrogen can reach 91.92%, and the volume removal load can reach 0.208kgN / (m 3 d).

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Abstract

The invention belongs to an aerobic biological nitrogen removal process for waste water containing high ammonia-nitrogen, and belongs to the field of sewage treatment. The process comprises the following steps: aerobic or anaerobic sludge used as inoculated sludge is added into an aeration reactor for treating waste water containing high ammonia-nitrogen; zero-valent iron is added into the aeration reactor, the mol ratio between the added zero-valent iron to the ammonia-nitrogen concentration is 2-20:1, pH value of the waste water containing high ammonia-nitrogen is adjusted to 6.5-8.0, the waste water containing high ammonia-nitrogen is kept in the reactor for 0.5-5 days at 20-35 DEG C, and the wastewater reaches the standard and is discharged or enters into a next treatment process. The problem of incomplete nitrogen removal in present anaerobic ammoxidation nitrogen removal process is overcome, the technology defect of long time consuming is overcome, the aerobic biological nitrogen removal process for waste water containing high ammonia-nitrogen is totally operated by autotrophy, the nitrogen removal efficiency is high, and the starting time consuming is short.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an aerobic biological denitrification process for high ammonia nitrogen wastewater. Background technique [0002] The biological denitrification technology of wastewater is an important way to prevent and control nitrogen pollution in water bodies, and has been widely used in the denitrification treatment of high ammonia nitrogen wastewater. Among many biological denitrification technologies, the anaerobic ammonium oxidation process has become a research hotspot due to its unique denitrification method. The principle of anammox denitrification is: under anaerobic or anoxic conditions, anammox bacteria use ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, and directly convert the two into N 2 , is a completely autotrophic process. However, some nitrate nitrogen will be generated in the anammox reaction, and complete denitrification ca...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/30C02F101/16
CPCC02F3/12C02F3/301C02F2101/16Y02W10/10
Inventor 郑丹邓良伟宋立
Owner BIOGAS SCI RES INST MIN OF AGRI
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