Microorganism enrichment system and enrichment method for degrading refractory organic matters

Abstract

The invention provides a microorganism enrichment system and an enrichment method for degrading refractory organic matters, industrial sewage enters an anaerobic tank, an anoxic tank, an aerobic tank, a first sedimentation tank, a coagulation stirring tank and a second sedimentation tank which are connected in sequence through a water inlet pipeline, and then is discharged through a water outlet pipeline; the first sedimentation tank is connected with the anaerobic tank through a first reflux pipeline, and the second sedimentation tank is connected with the anoxic tank through a second reflux pipeline. According to the enrichment method based on the enrichment system, suspended microorganisms and slowly-growing autotrophic microorganisms such as ammonia oxidizing bacteria and nitrifying bacteria for degrading refractory organic matters are recycled, so that the COD of final effluent is reduced by more than 30-50% on the basis of original biological treatment, the ammonia nitrogen of the effluent is also greatly reduced, an advanced oxidation treatment section and an adsorption treatment section of some wastewater can be omitted, and the chemical cost of the subsequent advanced oxidation treatment or adsorption treatment section is saved.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a microbial enrichment system and enrichment method for degrading refractory organic matter. Background technique [0002] Based on the traditional activated sludge treatment process, after biochemical treatment, the sludge and water are separated in the sedimentation tank, the supernatant enters the physical and chemical treatment, and the sludge is refluxed or discharged as excess sludge. Due to the comprehensive nutrition of municipal sewage, the organic matter contained in it is easy to degrade. After biological treatment, the microorganisms grow well and have good flocculation characteristics. For sewage plants with a large proportion of wastewater, due to the large amount of refractory organic matter, the growth of microorganisms is slow, especially for microorganisms that degrade refractory organic matter, the flocculation effect is extremely poor. After sedimentation in th...

AI Technical Summary

Problems solved by technology

Due to the comprehensive nutrition of municipal sewage, the organic matter contained in it is easy to degrade. After biological treatment, the microorganisms grow well and have good flocculation characteristics. For sewage plants with a large proportion of wastewater, due to the large amount of refractory organic matter, the growth of microorganisms is slow, especially for microorganisms that degrade refractory organic matter, the flocculation effect is extremely poor. After sedimentation in the sedimentation tank, the supernatant contains a large number of suspended microorganisms, which is difficult To achieve clarity, the required discharge can only be achieved after adding flocculant to settle, resulting in a large amount of so-called physicochemical sludge, and because the physicochemical sludge contains chemicals, it is generally discharged from the system as excess sludge, but in the proportion of industrial wastewater In large sewage plants, this part of the so-called physicochemical sludge has a large output. If it is directly discharged into the system, it will seriously make it difficult to maintain a certain sludge concentration in the activated sludge tank. At the same time, because this part of the physicochemical sludge is mainly composed of Composed of suspended sludge, it contains a large number of microorganisms that degrade refractory organic matter and autotrophic ammonia oxidizing bacteria and nitrifying bacteria with a long generation cycle. The discharge system will reduce the number of refractory microorganisms and nitrifying bacteria in the system, which is not conducive to refractory The removal of degraded organic matter and ammonia nitrogen will make it difficult to control the effluent index, and at the same time affect the stable discharge of COD and ammonia nitrogen. At the same time, a large number of bacteriophages will also be discharged from the system, resulting in an increase in the proportion of conventional microorganisms, which is not conducive to the enrichment and degradation of refractory organic matter. Microorganisms and autotrophic microorganisms with a long generation cycle, so that the final effluent can only be treated by subsequent advanced oxidation, which increases treatment costs, causes waste of resources and introduces secondary pollutants

Images