High-efficiency culture method of urban domestic sewage nitrosation granule sludge

Abstract

The invention relates to a high-efficiency culture method of urban domestic sewage nitrosation granule sludge, and the high-efficiency culture method comprises the following steps of: adding ammonia nitrogen to domestic sewage through a nitrosation starting stage at 17-25 DEG C by adopting a columnar intermittent sequencing batch reactor with the height-diameter ratio of 5-15 to domesticate the nitrosation property of active sludge; a granule sludge culture stage: basically forming the granule sludge by taking the domestic sewage as intake water and controlling sedimentation time to gradually shorten the sedimentation time from 14 minutes to 6 minutes by taking 2 minutes as a gradient; a granule sludge intensifying stage: controlling the sedimentation time for 4 minutes, and continuously operating till a granular average particle diameter exceeds 0.4 mm; a processing capacity intensifying stage: adding the ammonia nitrogen to the domestic sewage, controlling the sedimentation time for 4 minutes, operating till ammonia oxidation loads exceed 0.5 kgN / m<3> / d, restoring the domestic sewage as the intake water, and finally culturing the high-efficiency nitrosation granule sludge with the ammonia oxidation loads exceeding 0.4 kgN / m<3> / d and the granular average particle diameter exceeding 0.5 mm. The nitrosation granule sludge prepared through the high-efficiency culture method disclosed by the invention has the characteristics of stability in nitrosation property, high sludge concentration, high processing capacity, and the like.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and resource utilization, and in particular relates to a high-efficiency cultivation method of nitrosation granular sludge. Background technique [0002] The 2011 "China Environmental Status Bulletin" pointed out that among the main pollution indicators of the top ten water systems in the country, indicators such as ammonia nitrogen, biochemical oxygen demand and total phosphorus rank in the forefront, especially in the densely populated Yellow River and Yangtze River basins, where ammonia nitrogen pollution is even more serious. Occupied the 1st and 2nd places respectively; among the 26 nationally controlled key lakes (reservoirs) monitored, the proportions of lakes (reservoirs) in mesotrophic state, mild eutrophic state and moderate eutrophic state were 46.2% and 46.1% respectively. % and 7.7%, most lakes have eutrophication caused by nitrogen and phosphorus. Sewage treatment plan...

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Problems solved by technology

[0006] At present, although the nitrosation granular sludge cultivated has good nitrosation performance, the degree of sludge granulation is not high, and there are a large amount of flocculent sludge; the sludge load is not high, and the treatment capacity is poor, and the load is generally 0.10-0.25kgN / m 3 / d; the particle size is small, generally 0.2-0.5mm, and a more efficient nitrosative granular sludge cultivation method needs to be proposed

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