Method for realizing low carbon-nitrogen rate high concentration nitrogen-containing waste water steady biological hitrosation

Abstract

The invention discloses a method for realizing a stable biological nitrosation to a wastewater with low carbon nitrogen ratio and high nitrogen content. The method controls the aging of system sludge to 3 days and combines the operational methods of constant water-feeding and interval draining together. The method is carried out according to the following two phases: 1. sludge seeding and incubation phase: firstly the seeded sludge is put into a reactor and the incubation time is 20 days, and an activated-sludge SBR nitrosation process combining constant water-feeding and interval-draining is adopted as the beginning of incubation; 2. stable biological nitrosation operational phase: the activated-sludge SBR nitrosation process combining constant water-feeding and interval-draining which is successfully started is preserved, and the wastewater with low carbon nitrogen ratio and high nitrogen content is adopted as water supply, and the feeding-draining flow each week is a half of the volume of the reactor, the system sludge aging is preserved to be 3 days, and the DO concentration of the reactor is 1.5 to 2mg per L, and the operational cycle is 12 hours. The invention realizes a stable and constant biological nitrosation to the wastewater with low carbon nitrogen ratio and high nitrogen content, and the nitrosation system has better NH4 <plus> minus N degradation rate and higher nitrosation rate.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, and relates to a method for biological nitrosation of wastewater with low carbon-to-nitrogen ratio and high concentration of nitrogen, that is, a method for realizing stable and continuous nitrosation. Background technique [0002] Landfill leachate, sludge digestion supernatant, and some food processing factory wastewater and other high-concentration nitrogen-containing wastewater, the concentration of organic pollutants (COD) can reach 1000~10000mg / L, ammonia nitrogen (NH 4 + -N) concentration can reach 1000~8000mg / L. This kind of wastewater with low C / N ratio and high concentration of nitrogen is denitrified by the traditional complete nitrification and denitrification process, which will lead to poor denitrification effect due to insufficient carbon source required for denitrification. The emergence of nitrous acid-type biological denitrification process has solved t...

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Problems solved by technology

[0010] The inventor's actual test results show that medium and low NH 4 + If the nitrosation system of -N concentration wastewater is to maintain a sufficiently low sludge age required by the nitrosation system to achieve selective accumulation of nitrous bacteria, the sludge growth will be lower than the loss due to the low carbon and nitrogen loads of the system. , resulting in sludge loss and system collapse

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