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A method for improving the pH impact resistance of anaerobic ammonia oxidation particles

A technology of anaerobic ammonium oxidation and impact capacity, which is applied in anaerobic digestion treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem of not being able to improve the acid or alkaline pH impact resistance of ANAMMOX particles and limit ANAMMOX Wide application of technology, long doubling time of ANAMMOX bacteria and other problems, to achieve the effect of low cost, easy realization and remarkable effect

Active Publication Date: 2021-11-26
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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  • A method for improving the pH impact resistance of anaerobic ammonia oxidation particles
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Examples

Experimental program
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Effect test

Embodiment 1

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

[0037]Two sets of UASB reactors were set up, and after inoculation with ANAMMOX granular sludge, the continuous flow experiment (divided into 3 stages) was carried out. During the stable operation period (pH 7.0-7.5), the operating temperature is 33±2°C, the pH of the influent is 7.0-7.5, the dissolved oxygen in the influent is below 0.5mg / L, and the concentration of ammonia nitrogen in the influent is 46mg / L L, the concentration of nitrite nitrogen is 54mg / L, the ratio of the concentration of ammonia nitrogen and nitrite nitrogen in the influent is 1:1.32; during the pH shock stage, an extremely acidic pH5.5 shock is carried out for 15 days, and the reactor is added to the reactor every day during the pH shock period 2mg / L E-D-EPS, until the shock is over, other environmental conditions are consistent with the stable stage; in the recovery stage (operating for 30d~60d), the pH returns t...

Embodiment 2

[0040] During the pH shock stage, 15 days of extreme alkaline pH9.0 shock was carried out. During the pH shock period, 2 mg / L E-D-EPS was added to the reactor every day until the shock was over. Other experimental procedures were the same as in Example 1.

[0041] results and analysis:

[0042] 1. Embodiment 1

[0043] as attached figure 1 As shown, when no E-D-EPS was added, in the stable operation period, the particle structure was dense, good stability (high strength) and high activity (particle strength and activity were 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 decreased significantly (the particle strength and activity were as low as 0.26F S and 0.68kg N / (kg VSS d) respectively), and the nitrogen removal efficiency of the system was also significant. reduce. And even if the pH returns to the level of the stable period, the stability and activity of the particles are difficu...

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Abstract

The invention discloses a method for improving the anti-pH impact ability of anaerobic ammonium oxidation particles, which belongs to the field of wastewater treatment. In this method, denitrification sludge EPS (referred to as E‑D‑EPS) after intensive cultivation is added to the reactor to utilize the high flocculation efficiency of the enhanced denitrification EPS (abbreviated as E‑D‑EPS) and the large amount of acyl homoserine it contains. Lactone signaling molecules (AHLs) greatly improve the particle stability and activity under adverse pH shocks, enabling the system to maintain stable and high nitrogen removal efficiency even under extreme acidic or alkaline pH shocks.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to an anammox denitrification technology in the wastewater treatment process, and in particular to a method for improving the pH impact resistance of anammox particles. Background technique [0002] Anaerobic ammonium oxidation (ANAMMOX), as a new biological denitrification process, has many advantages such as low energy consumption, no need to add organic carbon sources, and high denitrification efficiency. 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 resistance of ANAMMOX particles t...

Claims

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Application Information

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Patent Type & Authority Patents(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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