Method for removing nitrogen and phosphorus by MBBRs (Moving Bed Biofilm Reactors) with sectionalized water inflow

Abstract

A method for removing nitrogen and phosphorus by MBBRs (Moving Bed Biofilm Reactors) with sectionalized water inflow belongs to the field of sewage treatment. The MBBRs at first, second and third sections are divided into three sections, a sand disc aerator is arranged at the bottom of each MBBR, a bearing layer is arranged above each sand disc aerator, and a filling area is arranged above each bearing layer; hollow spheres are adopted as fillers, and the specification specific surface area of the hollow sphere ranges from 400m<2> / m<3> to 500m<2> / m<3>; and the filling volume of the fillers ranges from 15% to 45%. According to the method, the improved sectionalized water inflow technology is combined with fluidized bed biofilms, and the technology has the advantages of resisting shock load, strengthening SND (Shortcut Nitrification and Denitrification) denitrification, saving energy and reducing consumption by combination of activated sludge and the fluidized bed biofilms. Therefore, the method is applicable to the field of deep nitrogen and phosphorus removing on domestic sewage and industrial sewage in large, middle and small cities and towns.

Description

technical field [0001] The invention relates to an improved segmental influent biological denitrification and phosphorus removal process, which belongs to the technical field of biochemical sewage biological treatment. It combines the improved segmental influent process with MBBR, and the combined use of activated sludge and fluidized bed biofilm makes the process At the same time, it has the advantages of anti-shock load, enhanced SND denitrification, energy saving and consumption reduction, and is suitable for deep denitrification and dephosphorization of domestic sewage and industrial wastewater in large, medium and small cities. Background technique [0002] The continuous flow segmental water inflow process is an efficient sewage biological denitrification process. It is a newly developed biological denitrification process at home and abroad in recent years. It couples the traditional AO process and UCT process. The influent water in the zone and anoxic zone is a biolog...

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Problems solved by technology

The biological contact oxidation method has many advantages and is an efficient biochemical treatment structure, but there are also some disadvantages: the thickness of the biofilm increases with the increase of the load, and if the load is too high, the biofilm will be too thick, causing plugging of the filler. With anti-clogging flushing measures

The activated sludge method has many advantages such as simple and flexible operation, wide adaptability, etc. However, problems such as large output of excess sludge, easy to be affected by the external environment, and low treatment efficiency have prompted researchers to continue to explore and develop new processes.

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