A device and method for enriching and separating nitrifying bacteria

Abstract

The invention discloses a device and method for enrichment and separation of nitrifying bacteria. The device includes a nitrification treatment tank, a partition plate is arranged in the nitrification treatment tank and divides the nitrification treatment tank into an enrichment tank and a separation tank. An aeration device is arranged at the bottom of the enrichment tank, a membrane module is arranged above the aeration device, the enrichment tank is internally filled with two fillers, the specific gravity of the first filler is 0.95-0.98 g / L, the particle size is 3-5 cm, the specific gravity of the second filler is 1-2.2 g / L, and the particle size is 0.15-0.3 mm. A filter screen for separating the first filler and the second filler is arranged at the lower portion of the separation tank, a first filler collecting port and a water draining port are formed above the filter screen, and a second filler collecting port is formed below the filter screen. A water draining sluice is arranged on the partition plate and located above the filter screen. The device can simultaneously achieve enrichment and separation of nitrifying bacteria and is high in nitrifying bacterium enrichment purity and large in enrichment amount.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a device and method for enriching and separating nitrifying bacteria. Background technique [0002] In the process of biochemical treatment, the removal of ammonia nitrogen mainly depends on nitrifying bacteria, and compared with heterotrophic bacteria in biological systems, digestive bacteria have a slow increase rate, are sensitive to dissolved oxygen, water temperature, and toxic substances, and are weak in resistance to occasional shocks, resulting in biochemical The nitrification function of the treatment system is unstable; therefore, ensuring that the effluent ammonia nitrogen reaches the standard is a major challenge for sewage treatment plants. [0003] Adding nitrifying bacteria directly is an effective means to quickly restore nitrification function. At present, the commercially available nitrifying bacteria agents have high purity and large quantity, but the ...

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Problems solved by technology

[0012] At the same time, the immobilized nitrifying bacteria can improve the effect of bioaugmentation. Currently, the addition of nitrifying bacteria is a one-time addition, which cannot be recycled, and the cost of adding is high (Herrero, M.; Stuckey, D.C., Bioaugmentation and its application in wastewater treatment: A review. Chemosphere 2015, 140, 119-28)

[0013] Therefore, in sewage treatment, there are still problems such as low enrichment purity and difficult separation of nitrification sludge to be solved.

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