Application of betaine in relieving inhibition of activity of anammox sludge by high-concentration free ammonia

Abstract

An embodiment of the invention provides an application of betaine in relieving inhibition of activity of anammox sludge by high-concentration free ammonia. High-concentration free ammonia is in the range of 20-35 mg / L. By adopting betaine as an additive, anammox activity of an anammox process can be recovered rapidly under inhibition of high-concentration free ammonia, and nitrogen removal rate (NRR) and total nitrogen (TN) removal rate are increased. The method has the advantages that the sewage treatment process is simplified, capital investment and operation cost are saved, anammox sludge acclimatization time is shortened effectively, and time cost is saved. Meanwhile, the method has better stability in coping with free ammonia concentration fluctuation when used for wastewater treatment. Besides, production cost of betaine is low, raw materials are easily available, by use of betaine, treatment cost is saved, and the purpose of ecological environmental protection is achieved.

Description

technical field [0001] The invention relates to the technical field of anaerobic ammonium oxidation, in particular to the application of betaine in alleviating the inhibition of high-concentration free ammonia on the activity of anaerobic ammonium oxidation sludge. Background technique [0002] The anammox process plays an important role in the nitrogen cycle and has been extensively studied in various anoxic ecosystems such as oceans, groundwater, and even in Antarctica. Compared with the traditional nitrification and denitrification process, the application of the anammox process reduces the demand for external carbon sources, reduces the sludge production, and has low operating costs. This process has been increasingly used to treat landfill seepage Filtrate and other high ammonia nitrogen wastewater and urban sewage. Nevertheless, the application of the ANAMMOX process is still limited by the complexity of real wastewater (e.g., fluctuations in composition and load) and...

AI Technical Summary

Problems solved by technology

[0005] FA easily penetrates the cell membrane, and FA entering the cell may change the intracellular pH and neutralize the transmembrane potential, and may even cause cell death

Studies have shown that in short-term tests (batch tests), a 50% reduction in anammox activity was observed when the FA concentration was 38 mg / L, while in long-term tests, the system operated when the FA concentration exceeded 20-25 mg / L It shows obvious instability; when the anammox sludge is exposed to the environment with FA concentration exceeding 35-40mg / L for a long time, its performance becomes extremely unstable, and the nitrogen removal efficiency drops to zero

[0006] Although, by reducing the influent NH 4 + -N concentration and increasing hydraulic retention time can effectively restore the denitrification performance of anammox sludge to a certain extent, but when severely inhibited by FA, ​​the tolerance of anammox bacteria to FA will decrease significantly , after long-term inhibition, FA will affect the microbial population structure of the anammox system

And this method is difficult to realize in practice due to the limitation of the reaction tank capacity of the structure in the engineering scale

Although the method of gradual domestication can save costs to a certain extent, it often takes too long and is not efficient

In addition, substrate concentrations in many types of wastewater, such as industrial wastewater, leachate, and sludge digestate, often fluctuate, adding to the difficulty of dealing with FA inhibition

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