Deep denitrification system and method based on heterotrophic-autotrophic combined treatment

Abstract

The invention relates to the technical field of sewage treatment and denitrification, and discloses a deep denitrification system and method based on heterotrophic-autotrophic combined treatment. The system comprises an intelligent fed water analysis unit, a heterotrophic deep denitrification unit, an autotrophic deep denitrification unit, a self-adaptive nitrogen removal backwashing unit and an intelligent agent adding unit. According to the system, a plurality of sewage control means are applied, part of nitrate nitrogen is metabolized and reduced into nitrogen through heterotrophic denitrifying bacteria by means of organic matters in sewage, then residual nitrate nitrogen in the sewage is metabolized and reduced through autotrophic sulfur autotrophic bacteria, and finally dual combined denitrification of the sewage is completed. The system and the method can further remove total nitrogen in sewage deep treatment; on one hand, the residual carbon source in tail water is effectively utilized, on the other hand, autotrophic nitrogen removal is utilized, no organic carbon source needs to be added, and the system is an intelligent deep nitrogen removal system which is low in operation cost, stable in effluent TN control and small in occupied area.

Description

technical field

[0001] The invention relates to the technical field of denitrification of sewage treatment, and discloses a deep denitrification system and method based on combined heterotrophic and autotrophic treatment. Background technique

[0002] With the development of my country's agricultural production, the acceleration of industrialization, the continuous increase of the total amount of sewage discharge, and the wide application of chemical fertilizers, synthetic detergents and pesticides, the problem of environmental pollution has become increasingly serious, especially the problem of water pollution. Domestic sewage and some industrial wastewater contain a certain amount of nitrogen, especially coal pressurized gasification wastewater, coking wastewater, nitrogen fertilizer wastewater, etc. A large amount of untreated or improperly treated nitrogen-containing waste water discharged into rivers will cause serious damage to the environment, such as causing eutrophi...

Examples

Embodiment 1

[0037] Bacteria cultivation and acclimation stage: Heterotrophic deep denitrification unit and autotrophic deep denitrification unit are used for microbial culture, the microorganisms used are taken from strains, and nitrogen-containing wastewater is used to start the culture. The heterotrophic deep denitrification unit cultivates heterotrophic bacteria, which are used to consume the remaining degradable carbon-containing organic matter in the tail water; the autotrophic deep denitrification unit cultivates sulfur autotrophic bacteria, which are used for further denitrification.

[0038] After the sludge has been cultivated for about two weeks, sulfur is added to the autotrophic deep denitrification unit for enrichment culture, and denitrification sludge with autotrophic characteristics is domesticated and cultivated. During the cultivation period, the nutrient solution was added every two days and the supernatant was replaced once. The main component of the nutrient solution w...

Embodiment 2

[0046] The water treatment process steps of this system are: the sewage after the secondary biochemical treatment first enters the water inlet tank 1, when the intelligent water inlet analysis unit judges that the liquid level of the water collection tank is high, start the lifting pump to drive the sewage into the heterotrophic depth The denitrification unit stops until the liquid level of the water inlet tank 1 is lower again.

[0047] The sewage entering the heterotrophic deep denitrification unit and the effluent from the autotrophic deep denitrification unit after sulfur autotrophic denitrification enter the bottom of the heterotrophic deep denitrification unit according to the reflux ratio, first pass through the water distribution filter head at the bottom, and then evenly mix with the The biofilm on the filler is in contact, and the heterotrophic bacteria use the organic matter in the influent as a carbon source to convert part of the NO in the influent 3 - -N convert...

technical field

[0001] The invention relates to the technical field of denitrification of sewage treatment, and discloses a deep denitrification system and method based on combined heterotrophic and autotrophic treatment. Background technique

[0002] With the development of my country's agricultural production, the acceleration of industrialization, the continuous increase of the total amount of sewage discharge, and the wide application of chemical fertilizers, synthetic detergents and pesticides, the problem of environmental pollution has become increasingly serious, especially the problem of water pollution. Domestic sewage and some industrial wastewater contain a certain amount of nitrogen, especially coal pressurized gasification wastewater, coking wastewater, nitrogen fertilizer wastewater, etc. A large amount of untreated or improperly treated nitrogen-containing waste water discharged into rivers will cause serious damage to the environment, such as causing eutrophi...

Examples

Embodiment 1

[0037] Bacteria cultivation and acclimation stage: Heterotrophic deep denitrification unit and autotrophic deep denitrification unit are used for microbial culture, the microorganisms used are taken from strains, and nitrogen-containing wastewater is used to start the culture. The heterotrophic deep denitrification unit cultivates heterotrophic bacteria, which are used to consume the remaining degradable carbon-containing organic matter in the tail water; the autotrophic deep denitrification unit cultivates sulfur autotrophic bacteria, which are used for further denitrification.

[0038] After the sludge has been cultivated for about two weeks, sulfur is added to the autotrophic deep denitrification unit for enrichment culture, and denitrification sludge with autotrophic characteristics is domesticated and cultivated. During the cultivation period, the nutrient solution was added every two days and the supernatant was replaced once. The main component of the nutrient solution w...

Embodiment 2

[0046] The water treatment process steps of this system are: the sewage after the secondary biochemical treatment first enters the water inlet tank 1, when the intelligent water inlet analysis unit judges that the liquid level of the water collection tank is high, start the lifting pump to drive the sewage into the heterotrophic depth The denitrification unit stops until the liquid level of the water inlet tank 1 is lower again.

[0047] The sewage entering the heterotrophic deep denitrification unit and the effluent from the autotrophic deep denitrification unit after sulfur autotrophic denitrification enter the bottom of the heterotrophic deep denitrification unit according to the reflux ratio, first pass through the water distribution filter head at the bottom, and then evenly mix with the The biofilm on the filler is in contact, and the heterotrophic bacteria use the organic matter in the influent as a carbon source to convert part of the NO in the influent 3 - -N convert...

Images