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Method for improving pH impact resistance of anaerobic ammonia oxidation particles

A technology of anaerobic ammonium oxidation and impact capacity, applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of not being able to improve the ability of ANAMMOX particles to resist acidic or alkaline pH impact, Restricting the wide application of ANAMMOX technology and the long doubling time of ANAMMOX bacteria to achieve the effect of low cost, easy implementation and remarkable effect

Active Publication Date: 2020-01-24
BEIJING UNIV OF TECH
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Problems solved by technology

However, ANAMMOX bacteria have a long doubling time and are highly sensitive to environmental changes. For example, acidic or alkaline pH shocks will seriously reduce the stability and activity of ANAMMOX particles, resulting in unstable operation performance of the reactor and deterioration of denitrification performance, which greatly limits Wide application of ANAMMOX process
However, there is currently no effective method to improve the ability of ANAMMOX particles to resist acidic or alkaline pH shocks
Most of the current research restores the performance of ANAMMOX particles and system denitrification performance after pH shock by reducing the concentration of ammonia nitrogen and nitrous nitrogen in the influent, but this method is not suitable for extreme acidic and alkaline pH shocks, and for general acids or alkalis It takes a long time to recover the properties of granules due to pH shock, and it is not easy to restore the original stability and activity of granules after alkaline pH shock

Method used

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  • Method for improving pH impact resistance of anaerobic ammonia oxidation particles

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Effect of E-D-EPS on particle strength and activity under extreme acid pH shock

[0037] Set up two sets of UASB reactors, after inoculating ANAMMOX granular sludge, conduct continuous flow experiment (divided into 3 stages). During the stable operation period, in the stable operation stage (pH 7.0-7.5), the operating temperature is 33±2°C, the influent pH is 7.0-7.5, the dissolved oxygen in the influent is below 0.5mg / L, and the ammonia nitrogen concentration in the influent is 46mg / L, the concentration of nitrous nitrogen is 54mg / L, the ratio of ammonia nitrogen to nitros nitrogen concentration in the influent is 1:1.32; in the pH shock stage, 15 days of extreme acidic pH5.5 shock is carried out, and the reactor is added daily during the pH shock 2mg / L ED-EPS, until the end of the impact, other environmental conditions are consistent with the stable phase; in the recovery phase (operating for 30 to 60 days), the pH returns to the stable phase level, and the environmenta...

Embodiment 2

[0040] During the pH shock stage, an extreme alkaline pH 9.0 shock was performed for 15 days. During the pH shock, 2 mg / L E-D-EPS was added to the reactor every day until the shock was over. The other experimental procedures were the same as in Example 1.

[0041] results and analysis:

[0042] 1. Example 1

[0043] As attached figure 1 As shown, when ED-EPS is not added, during the stable operation period, the particle structure is compact, stable (high strength) and high activity (particle strength and activity are as high as 0.70F·S and 0.97kg N / (kg VSS d) )). However, after 15 days of acidic pH shock, the stability and activity of ANAMMOX particles can be significantly reduced (the particle strength and activity are as low as 0.26F·S and 0.68kg N / (kg VSS d) respectively), and the system denitrification efficiency is also significant reduce. And even if the pH returns to the stable phase level, the stability and activity of the particles are difficult to recover in a short time...

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Abstract

The invention relates to a method for improving pH impact resistance of anaerobic ammonia oxidation particles, and belongs to the field of wastewater treatment. According to the method, a denitrification sludge extracellular polymeric substance (EPS) subjected to nutrition enhancement in a starvation period is added to a reactor, and the enhanced denitrification EPS (E-D-EPS) has high flocculationefficiency and contains a large number of acyl-homoserine lactone signal molecules (AHLs), so that particle stability and activity under adverse pH impact are greatly improved, and thus the system can maintain stable and has high denitrification efficiency even under extreme acidic or extreme alkaline pH impact.

Description

Technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to an anammox denitrification technology in the wastewater treatment process, and specifically relates to a method for improving the anti-pH impact ability of anammox particles. Background technique [0002] As a new type of biological nitrogen removal process, ANAMMOX has many advantages such as low energy consumption, no additional organic carbon source, and high nitrogen removal efficiency. However, ANAMMOX bacteria have a long multiplication time and are highly sensitive to environmental changes. For example, acidic or alkaline pH shocks will seriously reduce the stability and activity of ANAMMOX particles, resulting in unstable reactor performance and deterioration of denitrification performance, which greatly limits Wide application of ANAMMOX process. However, there is no effective method to improve the resistance of ANAMMOX particles to acid or alkaline pH shocks....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/282C02F3/2846C02F2101/16
Inventor 李军张晶周荣煊韩浩
Owner BEIJING UNIV OF TECH
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