Operational method for rapid restart of an anammox reactor contaminated with heavy metals

Abstract

The invention discloses a method for operating an anaerobic ammoxidation reactor capable of rapidly restarting the heavy metal pollution. According to the invention, a chelating cleaning solution is added in the anaerobic ammoxidation sludge subjected to heavy metal contamination, and then the obtained product is oscillated and washed in a shaking bath. The obtained supernatant is removed, and the low-storied sludge is oscillated and washed in an inorganic salt solution. The washed sludge is inoculated into a reactor, and simulated wastewater is pumped into the reactor, wherein the substrate initial concentration in the simulated wastewater is 50-70 mg / L. When the heavy metal concentration in the effluent water of the reactor is smaller than the heavy metal concentration in the inflowing water of the reactor, a growth activator is added into the inflowing water of the reactor. When the nitrate nitrogen concentration in the effluent water of the reactor is smaller than 10 mg / L and the three-day mean variation of the nitrate nitrogen concentration in the effluent water of the reactor is smaller than 15%, the substrate concentration in the simulated wastewater is gradually increased. When the total nitrogen removal rate is larger than 80% and the molar reaction stoichiometric ratio of the substrate is stable, the growth activator is no longer added into the inflowing water of the reactor. In this way, the restarting function is successfully realized. According to the invention, heavy metals remaining in the sludge can be efficiently removed. Meanwhile, the nitrogen removal performance of the reactor and the particle characteristics of the anaerobic ammoxidation sludge can be rapidly recovered.

Description

[0001] (1) Technical field [0002] The invention relates to an operating method for restarting an anaerobic ammonium oxidation reactor, in particular to an operating method for quickly restarting an anaerobic ammonium oxidation reactor polluted by heavy metals. [0003] (2) Background technology [0004] Nitrogen is an indispensable element of life, and its importance to human survival and development is self-evident. However, the excessive discharge of nitrogen-containing compounds in recent years has caused a series of serious hazards such as eutrophication of water bodies. Nitrogen in water often exists in the form of ammonia nitrogen. It has always been a difficult problem in the field of environmental engineering to achieve high-efficiency and low-consumption treatment of wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratio. [0005] The ANAMMOX process has become one of the most economical biological nitrogen removal processes due to its advantages of ...

AI Technical Summary

Problems solved by technology

When treating high-load wastewater containing heavy metals for a long time, heavy metals will accumulate in anaerobic ammonium oxidation sludge due to physical and chemical effects such as adsorption and precipitation, which will affect the operating performance of the reactor and even cause the reactor to collapse.

In addition, due to the unavoidable fluctuation of water quality in actual operation, it will cause heavy metal impact on the reactor

And there is currently a lack of targeted remediation and recovery (or restart) strategies

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