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 isadopted 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 highernitrosation rate.

Description

A method for realizing stable biological nitrification of wastewater with low carbon-to-nitrogen ratio and high-concentration nitrogen technical field 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 Landfill leachate, sludge digestion supernatant, and some food processing plant waste water and other high-concentration nitrogen-containing wastewater, the concentration of organic pollutants (COD) can reach 1000~10000mg / L, and the concentration of ammonia nitrogen (NH4+-N) 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...

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Problems solved by technology

The inventor's actual test results show that if the nitrosation system of medium and low NH4+-N concentration wastewater is to maintain a sufficiently low sludge age required by the nitrosation system to achieve the selective accumulation of nitrous bacteria, the carbon and nitrogen loads of the system will Low, the sludge growth is lower than the loss, which will eventually cause sludge loss and system collapse

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