A device and method for enriching nitrite-denitrifying polysaccharide bacteria

Abstract

The invention provides an apparatus and method for enriching nitrite denitrifying glycogen accumulating organisms, belonging to the technical field of environmental protection. According to the method, synthetic wastewater 1 is pumped into a denitrifying glycogen accumulating organism enriching SBR reactor, then anaerobic stirring is carried out, and denitrifying glycogen accumulating organisms decompose glycogen under an anaerobic condition so as to provide energy and reducing power NADH2 for synthesis of PHAs; a carbon source is absorbed, synthesized PHAs are stored in cells, but phosphorus is not released; after completion of an anaerobic phase, settling and water discharging are carried out, then synthetic wastewater 2 free of phosphorus and a carbon source and containing nitrite nitrogen is added, and anoxic stirring is carried out; PHAs in the oxidation cells of the glycogen accumulating organisms are used for regeneration of glycogen and growth and propagation of microbes; nitrite nitrogen is converted into nitrogen gas through the process of denitrification and discharged out of a system, thereby achieving the purpose of removing nitrogen from the system; settling and water discharging are carried out after completion of an anoxic phase; and the concentration of sludge is maintained in a range of 2500 to 4000 mg / L. The method can realize rapid and high-efficiency enrichment culture of the denitrifying glycogen accumulating organisms.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for enriching denitrifying polysaccharide bacteria by adjusting the operation mode of the enrichment device and controlling the reaction conditions by using excess sludge from an urban domestic sewage treatment plant. Background technique [0002] Water eutrophication has become one of the important environmental problems faced by my country's sustainable development. Excessive nitrogen and phosphorus are the main factors causing water eutrophication. At present, the more economical and effective phosphorus removal method is the enhanced biological phosphorus removal method (enhanced biological phosphate removal, EBPR) based on the excessive phosphorus uptake of phosphorus accumulating organisms (PAOs). Enhanced biological phosphorus removal refers to the purpose of reducing the concentration of phosphorus in sewage by enriching phosphorus ac...

AI Technical Summary

Problems solved by technology

In the EBPR system, in addition to phosphorus accumulating bacteria, there is another type of microorganisms—glycogen accumulating organisms (GAOs) that can also absorb carbon sources and synthesize polyhydroxyalkanoates (PHAs) in an anaerobic environment. ) is stored in the cell, but does not release phosphorus, decomposes PHAs to synthesize glycogen under aerobic conditions without accumulating phosphorus, and does not contribute to phosphorus removal

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