Dissolved oxygen automatically controlled MBR full-course nitrifying bacteria enriching device and method thereof

Abstract

The invention discloses a dissolved oxygen automatically controlled MBR full-course nitrifying bacteria enriching device and a method thereof. The device comprises a reactor, a water inlet barrel, a water bath pot and a control cabinet, wherein a reactor main body is a cylindrical tank body; a water inlet is formed below the tank body and dewaters through an internal membrane assembly; the tank body is filled with packing; a DO probe and a sampling port are formed above the tank body; a temperature-control jacket is arranged on the outer side of the tank body; an aerating disc is arranged in the bottom of the tank body to regulate the concentration of the dissolved oxygen in the reactor and meanwhile plays a stirring role and prevents the membrane assembly from being blocked. The device disclosed by the invention provides an environment with low dissolved oxygen and low nutritional matters for full-course nitrifying bacteria; the specific surface area of the packing filling the reactor is large, so that microorganisms are attached to grow; the membrane assembly is adopted for effluent, so that the biomass loss can be effectively prevented; the dissolved oxygen in the reactor is controlled at a relatively low level through a dissolved oxygen probe, an air pump and a nitrogen steel cylinder, so that full-course nitrifying bacteria are effectively enriched to obtain a high purity enriched culture.

Description

technical field [0001] The invention belongs to the field of environmental protection devices, and in particular relates to an MBR full-process nitrifying bacteria enrichment device and method thereof with automatic control of dissolved oxygen. Background technique [0002] For a long time, nitrification has been considered to be carried out in two steps. The first step is ammonia oxidizing bacteria (AOB) or ammonia oxidizing archaea (AOA). 4 + ) is oxidized to nitrite (NO 2 - ), the second step is to convert nitrite (NO 2 - ) is oxidized to nitrate (NO 3 - ), ammonia-oxidizing microorganisms, and nitrite-oxidizing bacteria (NOB) were unable to oxidize both substances simultaneously. However, energy analysis found that the whole process of nitrification can obtain more energy than the single-step oxidation reaction, and theoretically there are process nitrifying bacteria. Costa's team studied the mechanism of step-by-step nitrification ten years ago, and believed tha...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of easy loss of biomass in existing devices by adding membrane modules into the reactor, and provide an environment with low dissolved oxygen and low substrate concentration for the enrichment and cultivation of nitrifying bacteria in the whole process, and construct a dissolved oxygen Automatically controlled MBR full-process nitrifying bacteria enrichment device

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