Method for increasing matrix impact resistance of ANAMMOX granules

Abstract

The invention discloses a method for increasing the matrix impact resistance of ANAMMOX granules, and belongs to the field of wastewater treatment. The method comprises the following steps: carrying out impact of 1500 to 2500 mg / L of total nitrogen for 12 to 48 hours during a matrix impact period of an ANAMMOX reactor which is in stable running, and adding 0.1 mg / L to 1.5 g / L of pig kidney acylaseI into the reactor every hour until finishing the matrix impact; enabling not to add an AHLs (Acylated Homoserine Lactones) inhibitor-the pig kidney acylase I into the reactor any more after finishing the matrix impact. According to the method disclosed by the invention, the activity of an ANAMMOX granule group induction system under the matrix impact can be inhibited by adding the AHLs inhibitor-the pig kidney acylase I in lower concentration, so that the release amount of granular AHLs can be reduced, excessive release of LB-EPS (Loose Binding-Extracellular Polymeric Substance) can be controlled, and the stability and the sedimentation capacity of granules under the matrix impact can be increased; meanwhile, adverse effect to activity of the granules cannot be caused when the concentration of an inhibitor is lower.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to an anammox denitrification technology in the waste water treatment process, and in particular to a method for improving the impact resistance of anammox granules. Background technique [0002] Anaerobic ammonium oxidation (ANAMMOX), as a new biological denitrification process, has many advantages such as low energy consumption, low operating cost and high denitrification efficiency. However, the doubling time of ANAMMOX bacteria is long, the cell yield is low, and it is highly sensitive to environmental changes. For example, the impact of the matrix will deteriorate the performance of ANAMMOX particles, and the concentration of suspended solids (SS) in the effluent will increase, resulting in unstable reactor performance, which limits ANAMMOX. Wide application of technology. Research by Zhang et al. [1] It shows that the 24-hour high-concentration total nitrogen shock will ...

AI Technical Summary

Problems solved by technology

Normally, the higher the amount of AHLs signal molecules released by the particles, the better for the sludge to maintain a good granulation structure and excellent sedimentation performance. Inhibiting the release of AHLs signal molecules will lead to poor sedimentation performance of the particles, or even disintegration and loss. [6]

Although related reports [1] It has been pointed out that high-concentration total nitrogen shock causes ANAMMOX particles to excessively release loosely bound extracellular polymers (LB-EPS). LB-EPS is a key factor determining particle stability and sedimentation performance. The denitrification performance of the system is unstable, but the mechanism of excessive release of LB-EPS from ANAMMOX particles under matrix impact has not been explored and studied

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