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Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis

An anammox and quick-start technology is applied in the field of rapid start-up of anammox reactors, which can solve the problem of unfavorable anammox bacteria growth and proliferation, slow start of anammox reactors, and obstruction of anammox Oxidative bacteria amplification and other problems, to shorten the start-up time, accelerate hydrolysis and autolysis, and reduce the number and density

Active Publication Date: 2015-02-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When inoculating conventional activated sludge to start the anammox reactor, because it contains a large number of heterotrophic bacteria, it will compete for the matrix and living space of anammox bacteria, which is not conducive to the growth and proliferation of anammox bacteria
For example, heterotrophic denitrifying bacteria can preferentially use nitrite for denitrification, making it difficult for anammox to obtain substrate nitrite; in addition, the doubling time of heterotrophic bacteria is significantly shorter than that of anammox bacteria, and it is easier Obtaining a competitive advantage in the space hinders the expansion of anammox bacteria, resulting in slow start-up of the anammox reactor

Method used

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  • Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis
  • Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis
  • Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1L of anaerobic granular sludge was retrieved from the IC reactor of a wastewater treatment station in a paper mill. The measured particle size was 2.5±0.4mm, the density was 1.081±0.055g / mL, and the settling velocity was 36.7±3.8m / h. Wash the retrieved granular sludge three times with phosphate buffer (1mmol / L, pH 7), put it into a 2L container, add ammonia at a concentration of 120mg / L, and a nitrite concentration of 150mg / L (both in nitrogen Stir for 10 minutes, pass in argon gas for 30 minutes, seal it and let it stand in a dark place for 1 day. After it stinks and turns black, pour off the supernatant and continue to rinse with phosphate buffer for 3 times. The washed granular sludge is then repeated 2 times to complete the pretreatment. Inoculate the pretreated sludge into an anaerobic ammonium oxidation UASB reactor with a total volume of 2.5L and a reaction zone volume of 1.1L, and set the initial influent matrix ammonia and nitrite concentrations to 150mg / L, bo...

Embodiment 2

[0036]Anaerobic granular sludge was taken from a brewery wastewater treatment station. The average particle size was 1.7mm, the average density was 1.056g / mL, the sedimentation velocity was 26.4m / h, the concentration of ammonia added was 150mg / L, and the nitrite The concentration is 170mg / L; during the start-up process of the UASB reactor, the initial concentration of ammonia and nitrite in the influent substrate is set to be 180mg / L, both calculated as nitrogen, the initial hydraulic retention time is 5h, and the rising flow rate of the liquid surface in the reaction zone is 10.19 cm / h, during operation, slowly add 2.0g / L potassium bicarbonate solution from the bottom of the reactor through a peristaltic pump (the flow rate is 35mL / (L d)), slowly add 3.5mmol from the middle of the reactor / L dilute hydrochloric acid solution (flow velocity is 26mL / (L·d)).

[0037] All the other conditions are the same as in Example 1.

[0038] In the first 6 days of the reactor start-up proc...

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Abstract

The invention discloses a rapid starting method of an anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis. The rapid starting method is characterized by comprising the following steps: carrying out high-substrate concentration pre-treatment on inoculated sludge to accelerate heterotrophic bacteria to be dead of hunger and utilizing the inoculated sludge to an inoculating reactor; continually carrying out policies including high substrate concentration, low hydraulic retention time, high liquid surface ascending velocity, pH (Potential of Hydrogen) regulation and control to rapidly eliminate the heterotrophic bacteria and improve the density of the heterotrophic bacteria in the sludge, so as to finally realize the rapid starting of the anaerobic ammonia oxidation reactor. According to the rapid starting method, the quantity of the heterotrophic bacteria in the sludge can be obviously reduced in short time and the density of anaerobic ammonia oxidation bacteria is increased; the rapid starting method can observe an obvious and continuous anaerobic ammonia oxidation phenomenon of the reactor after the reactor is started for 32 days.

Description

technical field [0001] The invention relates to the technical field of wastewater biological denitrification, in particular to a quick start-up method of an anaerobic ammonium oxidation reactor. Background technique [0002] During the "Eleventh Five-Year Plan" period, chemical oxygen demand (chemical oxygen demand, COD) emissions were effectively controlled, and ammonia nitrogen rose to become the main pollutant in surface water. Exceeding the standard of ammonia nitrogen in surface water was common throughout the country, resulting in eutrophication of water bodies. serious. my country has incorporated ammonia nitrogen into the "Twelfth Five-Year Plan" total pollutant control system. Water nitrogen pollution control has become a major environmental protection issue to be solved urgently. [0003] Anaerobic ammonium oxidation is a process in which nitrite is used as an electron acceptor to oxidize ammonia to nitrogen and a small amount of nitrate. The volume efficiency o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
Inventor 唐崇俭柴立元闵小波杨志辉王海鹰彭兵
Owner CENT SOUTH UNIV
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