An integrated autotrophic denitrification device and start-up method for treating high-ammonia-nitrogen wastewater

Abstract

The invention provides an autotrophic nitrogen removal integrated device for treating high ammonia-nitrogen wastewater and a starting method, wherein aeration sand heads are adopted for aeration and a gas-collecting hood in the shape of an inverted funnel is arranged above the aeration sand heads. When the device is used for aeration, sludge in the gas-collecting hood is pushed to flow upwards, and sludge outside the hood automatically enters into the hood, so as to form circulating flowing and reach a better mass transfer effect. According to the device, through inoculating a small amount of granule sludge, the aeration rate is gradually increased without accumulation of nitrosyl chloride, so as to culture more and larger granule sludge with higher load. Through 37d, ammonia nitrogen loading reaches 0.47Kg / (m3.d) and reaches the average ammonia nitrogen loading of the inoculated granules. The device is suitable for denitrogenation treatment of middle-high concentration ammonia-nitrogen wastewater, the structure is simple, the degree of automation is high, the denitrogenation effect is good, the running cost is low, and the device can be used for culturing and treating autotrophic nitrogen removal integrated starting of the high ammonia-nitrogen wastewater.

Description

technical field [0001] The invention relates to the fields of water supply and drainage engineering and environmental engineering, in particular to an integrated autotrophic denitrification device and a start-up method for treating high-ammonia-nitrogen wastewater. Background technique [0002] Nitrogen pollution is one of the important reasons for the frequent occurrence of eutrophication in water bodies, and it is also the key to sewage treatment and recycling. How to remove nitrogen pollutants in sewage economically and efficiently has become a topic of concern for experts and scholars at home and abroad. The research hotspot of government departments, my country's "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) promulgated in 2002 requires that the effluent quality of all sewage units should be less than 5mg / L for ammonia nitrogen and less than 15mg / L for total nitrogen. In the "Twelfth Five-Year Plan" national economic and social development pl...

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Problems solved by technology

[0004] The anammox process has many technical advantages, and it has been a research hotspot of domestic and foreign experts since the 1980s. However, how to popularize and apply the anammox technology has always been a difficult problem in the world. The generation growth time of anammox bacteria It is very long, about 11 days, and the sludge loss is serious at the initial stage of the anammox process, and the enrichment and cultivation of anammox bacteria is extremely difficult. The start-up period limits the rapid popularization and application of this technology. In order to shorten the start-up time of the anammox process, it is necessary to improve the retention capacity of the reactor for anammox bacteria so that the anammox bacteria can be quickly enriched. The latest The research results show that the formation of granular sludge in the reactor or the addition of new biological fillers can enhance the retention capacity of anammox bacteria, but there are still some technical problems in this technology, including: ① gas production capacity of anammox bacteria Stronger, so the granular sludge is not easy to settle, and it is easy to lose with the effluent; ②The simple biofilm process has a long time for the anammox bacteria to hang the film, the microbial biomass is low, the reactor processing capacity is difficult to improve, and the biofilm is easy to fall off , not easy to store and inoculate in new projects

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