Quick starting method and device for autotrophic nitrogen removal of low-concentration wastewater

Abstract

The invention discloses a quick starting method and device for autotrophic nitrogen removal of low-concentration wastewater. The quick starting method comprises the following steps of: (1) inoculating nitrification sludge into an anaerobic ammonia oxidation reactor, and continuously aerating the sludge; (2) introducing low-concentration wastewater into the anaerobic ammonia oxidation reactor, carrying out biofilm culturing and filling in the anaerobic ammonia oxidation reactor, starting operation, carrying out aeration control on the sludge in the anaerobic ammonia oxidation reactor, and carrying out biofilm culturing on nitrifying bacteria; and (3) continuously operating the anaerobic ammonia oxidation reactor, continuously feeding and discharging water, monitoring the concentrations of ammonia nitrogen and nitrite nitrogen in the fed and discharged water, controlling and shortening the hydraulic retention time of the anaerobic ammonia oxidation reactor according to the concentration of the nitrite nitrogen in the discharged water, and carrying out reflux treatment on sludge precipitated in the anaerobic ammonia oxidation reactor. The method for starting anaerobic ammonia oxidation by using low-concentration wastewater has the advantages of high proliferation rate, high treatment efficiency, short starting period and the like, and is simple and easy to operate and wide in engineering application prospect.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a quick-start method and device for autotrophic denitrification of low-concentration wastewater. Background technique [0002] The basic principle of anaerobic ammonia oxidation (ANAMMOX) is that under anaerobic conditions, microorganisms react with nitrite nitrogen as an electron acceptor and ammonia nitrogen as an electron donor to generate nitrogen gas, thereby achieving the purpose of denitrification. Compared with the traditional biological denitrification process, the anaerobic ammonium oxidation process does not require an external organic carbon source as an electron donor, saving about 40% of operating costs and preventing CO 2 Secondary pollution; the pre-reaction only needs half of the NH 4 + -N oxidation to NO 2 --N, saving oxygen supply; slow growth of anammox bacteria, reducing sludge production by 90%, saving sludge treatment costs. For low C / N...

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Problems solved by technology

Moreover, in view of the current situation of low influent concentration, large treatment capacity, high energy consumption at low temperature and high temperature rise of conventional urban domestic sewage, slow cultivation and acclimation of ammonia oxidizing bacteria, and easy loss of bacteria, how to quickly and stably realize the rapid proliferation of anammox bacteria It is the key to solve nitrification and denitrification and ANAMMOX and other processes applied to urban domestic sewage

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