Normal temperature low-ammonia-nitrogen nitrosation starting method

Abstract

A normal temperature low-ammonia-nitrogen nitrosation starting method belongs to the field of urban sewage treatment and reclamation. Researches show that nitrosation starting can be achieved in short time by controlling condition of low dissolved oxygen (DO=0.30mg / L) and inoculating sludge with certain nitrosation effect. If whole course nitration sludge is inoculated, no accumulation of nitrite occurs within 30 days in a water distribution test, no accumulation of nitrite occurs in 30 days in a reactor which utilizes the A / O dephosphorization process processing water as a research object, and the nitrosation starting fails accordingly. Nitrite accumulation can occur by adopting the mode of high-low gradient oxygen limit culture, domesticating the sludge for 10 days under the condition that DO=0.70-0.80mg / L, then controlling condition of low dissolved oxygen (0.30-0.40mg / L) to enable the reactor to discharge water if the whole course nitration sludge is inoculated. Over 90% of nitrosation rate can be achieved within 38 days by continuously domesticating the sludge under the condition of the dissolved oxygen, so that nitrosation can be successfully started.

Description

technical field

[0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a rapid start-up method specially used for nitrifying sludge with different attributes under normal temperature and low ammonia nitrogen level. Background technique

[0002] At present, most urban sewage treatment plants use traditional processes, such as A 2 / O, oxidation ditch, biological aerated filter and other processes or their improved processes. Although it can achieve good results in the removal of organic matter, it has not been effective in the removal of nutrients nitrogen and phosphorus, especially the removal of nitrogen, which has always been a difficult point. These processes all adopt the traditional denitrification mechanism in denitrification, that is, the organic nitrogen and ammonia nitrogen in the water body are oxidized into nitrite nitrogen, and then further oxidized into nitrate nitrogen, and then reduced into nitrogen thro...

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