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Method for starting half short-cut nitrification technology

A semi-short-cut nitrification and process technology, applied in the start-up field of the semi-short-cut nitrification process, can solve the problem of slow enrichment of ammonia oxidizing bacteria, and achieve the effects of good treatment, stable operation, and high ammonia nitrogen conversion load

Active Publication Date: 2013-08-28
HANGZHOU NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a start-up method for a semi-short-range nitrification process, which can solve the problem of slow enrichment of ammonia-oxidizing bacteria while providing a suitable influent substrate for the anaerobic ammonium oxidation process

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  • Method for starting half short-cut nitrification technology

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Embodiment 1

[0015] refer to figure 1 The bottom of the reactor body 1 is equipped with an air inlet and a water inlet, the air passes through the air compressor 2 and the flow rate is controlled by the air flow meter 3, and is introduced into the bottom of the reactor through the microporous gas distributor 4, and the ammonia nitrogen wastewater is collected by the reactor. The peristaltic pump 5 is pumped into the upflow zone 6 from the water inlet at the bottom. The specific steps for starting the semi-short-cut nitrification process are as follows: first, inoculate the aerobic activated sludge into the air-lift internal loop reactor with an effective volume of 3.8 L, and inoculate the sewage The mud concentration is 10g / L, and the simulated wastewater containing ammonia (the initial concentration of ammonia nitrogen is 70mg / L) is used as the reactor feed water, the water temperature of the reactor is maintained at 30°C, the dissolved oxygen concentration in the reactor is 3.0mg / L, and t...

Embodiment 2

[0018] refer to figure 1 , This embodiment adopts the reactor device identical with embodiment 1. The specific steps for the start-up of the semi-short-cut nitrification process are as follows: first, aerobic activated sludge was inoculated into an air-lift internal loop reactor with an effective volume of 3.8 L, the concentration of the inoculated sludge was 15 g / L, and simulated wastewater containing ammonia (ammonia nitrogen The initial concentration is 84mg / L) as the reactor feed water, the reactor water temperature is maintained at 35°C, the dissolved oxygen concentration in the reactor is 4.0mg / L, the hydraulic retention time is 24h, and the mass ratio of alkalinity to ammonia nitrogen in the feed water is 7.14:1, monitor the concentration of ammonia nitrogen in the effluent in real time, and increase the concentration of ammonia nitrogen in the influent when the conversion rate of ammonia nitrogen is greater than 80%; the method for increasing the concentration of ammon...

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Abstract

The invention discloses a method for starting a half short-cut nitrification technology, which comprises the following steps of: inoculating aerobic active sludge into an aerobic reactor, wherein the ammonia-containing wastewater is the fed water of the reactor, the ammonia nitrogen concentration of the initial fed water is 70-84mg / L, the water temperature of the reactor is kept at 30-35 DEG C, the concentration of the dissolved oxygen is 3.0-4.0mg / L, the hydraulic retention time is 20-24 hours, and the mass ratio of the alkalinity to the ammonia nitrogen of the fed water is 7.14:1; when the ammonia nitrogen conversion rate is greater than 80%, gradually increasing the ammonia nitrogen concentration of the fed water to 1,218-1,442mg / L to realize the enrichment culture of nitrification flora; when the nitrite accumulation rate of the yielding water is not less than 90%, maintaining the water temperature of the reactor at 30-35 DEG C, keeping hydraulic retention for 20-24 hours, adjusting the mass ratio of the alkalinity to the ammonia nitrogen of the fed water to 3.57:1, and reducing the concentration of the dissolved oxygen to 1.2-2.4mg / L; and when the molar ratio of nitrite nitrogen to ammonia nitrogen in the yielding water is (1.0-1.32):1, realizing the start of the half short-cut nitrification technology. The method disclosed by the invention can solve the problem of slow enrichment of ammonia oxidation bacteria; and the started half short-cut nitrification technology operates stably and is suitable for the pretreatment of an anaerobic ammonia oxidation technology.

Description

(1) Technical field [0001] The invention relates to a start-up method of a semi-short-range nitrification process. (2) Background technology [0002] Anaerobic ammonium oxidation is a new biological nitrogen removal process, which can reduce nitrite to nitrogen under anaerobic conditions with ammonia as an electron donor, and realize the simultaneous removal of two nitrogen pollutants. Compared with the traditional biological denitrification process, anaerobic ammonium oxidation has the advantages of good denitrification effect, no need for oxygen and external organic carbon source, less residual sludge output, low operating cost, etc., and has a good industrial application prospect. However, the content of nitrite in ammonia-containing wastewater is generally low, so the source of nitrite has become a bottleneck that limits the advantages of anammox. Semi-short-cut nitrification can convert 50-57% of ammonia into nitrite, which can meet the substrate requirements of anammo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/12
CPCY02W10/10
Inventor 金仁村邢保山秦天悦陈伸星张珏
Owner HANGZHOU NORMAL UNIVERSITY
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