Process for starting anaerobic ammonia oxidation through AB-ASBRs

Abstract

The invention discloses a process for starting anaerobic ammonia oxidation through AB-ASBRs. The process includes the following steps that firstly, urban sewage treatment plant returned sludge serves as inoculated sludge and is injected into the ASBRs on the front section and the rear section of a device for starting anaerobic ammonia oxidation through the AB-ASBRs for an adsorption and degradation reaction; after the sludge is granulated, NH4+-N and NO--N are added to the ASBR on the front section, the initial concentrations are 50 mg / L and 40 mg / L respectively and are gradually increased, increase gradients are 50 mg / L and 20 mg / L respectively, the concentrations of NH4+-N and NO--N are increased to 550 mg / L and 320 mg / L respectively, and finally anaerobic ammonia oxidation is achieved; after anaerobic ammonia oxidation starting is completed, organic wastewater containing ammonia nitrogen is subjected to anaerobic treatment, and effluent obtained after treatment and excess sludge are drained through a water outflow pipe and a sludge valve. By means of the process, ammonia nitrogen in the wastewater can be removed while high-concentration organic matter is removed, sewage treatment efficiency is remarkably improved, and treatment cost is reduced.

Description

technical field [0001] The invention relates to a process for starting anaerobic ammonium oxidation in an AB-ASBR reactor, and belongs to the technical field of biological treatment of sewage sludge. Background technique [0002] Ammonia nitrogen reduction processes are mainly divided into two categories: physicochemical and biochemical. Physicochemical treatment has high investment costs, high operating costs, and is likely to cause secondary pollution. Biochemical treatment has low cost and less secondary pollution. The ammonia nitrogen removal rate of the traditional biological denitrification process can reach 70%-80%. If the operation and debugging are proper, the ammonia nitrogen removal rate still has a large room for improvement. [0003] The existing domestic sewage biological treatment system often supplements the carbon source demand by adding external carbon sources, which not only increases the treatment cost, but also exacerbates the CO2 in the water plant. ...

AI Technical Summary

Problems solved by technology

The ASBR process also has the following disadvantages: 1. The dominance of the bacterial flora is unstable and the processing efficiency is not high

Intermittent fermentation is carried out in ASBR. As the initial substrate is continuously transferred to the intermediate product, the composition and dominant population of microorganisms in the reactor are also constantly replaced, making it difficult for Methanosarcina and Methanothrix in the ASBR reactor to stabilize. , their respective biochemical advantages cannot be fully utilized

2. The economic potential needs to be further explored, and the operating cost is relatively high

Since most of the anaerobic granular sludge formed in the ASBR reactor is methanothrix as the dominant bacteria, the function of high substrate utilization rate of Methanosarcina is sacrificed, which limits the increase of organic load of ASBR

In order to ensure the normal operation of the ASBR reactor, measures to reduce the design load are often adopted to ensure that the reactor can easily maintain the balance between acid-producing bacteria and methanogenic bacteria under a relatively low load, thus limiting the volume load of the reactor. improve

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