CN112250196A

CN112250196A - Sewage denitrification process based on pseudomonas

Info

Publication number: CN112250196A
Application number: CN202011122107.5A
Authority: CN
Inventors: 宋晨; 张祥; 王晨; 何灵子
Original assignee: Nanjing Frontier Environmental Technology Co ltd
Current assignee: Nanjing Frontier Environmental Technology Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-01-22

Abstract

The invention discloses a sewage denitrification process based on pseudomonas, which is characterized by comprising the following steps: step S1, starting the biological filter reactor, and selecting pseudomonas as a functional microorganism to carry out biofilm formation operation, wherein the abundance of the pseudomonas is 30-50%; s2, after the biofilm formation is successful, injecting the sewage to be treated into the biological filter reactor for nitrification and denitrification treatment, and then adding a carbon source; step S3, discharging the qualified water; compared with the prior art, the invention can realize the sewage denitrification treatment in the anaerobic state in the whole course, ensure the stable nitrification-denitrification treatment, and has lower energy consumption and high denitrification treatment efficiency compared with the prior art.

Description

Sewage denitrification process based on pseudomonas

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a sewage denitrification process based on pseudomonas.

Background

Conventional biological denitrification is mainly achieved in two steps. Firstly, the microorganism reacts NH under aerobic conditions₃ ^-Stepwise oxidation of-N to NO₂ ^--N to NO₃ ^--N. Then under anaerobic condition, adding NO₃ ^-Reduction of-N to NO₂ ^--N to N₂. Finally realizing the denitrification of the sewage. The former step mainly depends on nitrifying bacteria to realize nitration reaction, and the latter step mainly carries out denitrification reaction through denitrifying bacteria.

The traditional nitrification-denitrification is a main measure for controlling the TN of the water body at present, but the problem of low treatment efficiency generally exists. The selection of functional microorganisms is a major factor in determining the efficiency of biological denitrification. At present, the nitrification and denitrification processes rely on two types of flora, namely nitrifying and denitrifying flora, respectively. The two groups of flora are gradually formed in a long-term anaerobic/aerobic environment, and corresponding flora can be added according to the working links in the sewage treatment operation. However, in the actual biological denitrification process, the water in the front-end aerobic nitrification tank can carry a large amount of O₂Entering a back-stage denitrification tank to carry O₂Even in a short time, the inhibitor can inhibit denitrifying bacteria, so that the denitrification process is unstable, and the denitrification efficiency is reduced. In addition, generally speaking, the nitrification reaction is achieved by the action of nitrifying bacteria under aerobic conditions, and a large amount of energy is required for aeration in the nitrification reaction stage.

Pseudomonas is widely present in the environment. Which is reactive to NH under anaerobic conditions₃ ^-The oxidation of-N is carried out, thereby realizing anaerobic ammonia oxidation without energy consumption for aeration.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a sewage denitrification process based on pseudomonas for NH under anaerobic conditions₃ ^-And oxidizing N to realize anaerobic ammonia oxidation and improve denitrification efficiency.

The invention provides a sewage denitrification process based on pseudomonas, which comprises the following steps:

step S1, starting the biological filter reactor, and selecting pseudomonas as a functional microorganism to carry out biofilm formation operation, wherein the abundance of the pseudomonas is 30-50%;

s2, after the biofilm formation is successful, injecting the sewage to be treated into the biological filter reactor for nitrification and denitrification treatment, and then adding a carbon source;

step S3, discharging the qualified water;

in the steps S1 and S2, the interior of the biofilter reactor is an anaerobic environment.

Preferably, in the step S1 and the step S2, the DO value in the biofilter reactor is maintained below 2 mg/L.

The invention has the beneficial effects that:

compared with the prior art, the invention can realize the denitrification treatment of the sewage in the anaerobic state in the whole course, ensure the stable nitrification-denitrification treatment, and has high denitrification treatment efficiency, and the invention can effectively reduce NH in the sewage₃ ^--N and TN, NH₃ ^-The removal rate of-N can reach more than 80 percent, and the removal rate of TN can reach more than 60 percent.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order that the invention may be better understood, the invention will now be further illustrated by the following examples, which are intended to be illustrative only and are not to be construed as limiting the invention in any way: the invention is not described in detail, but is well known to those skilled in the art.

Example 1

Referring to fig. 1, the present embodiment provides a sewage denitrification process based on pseudomonas, which specifically includes:

step S1, starting the biological filter reactor, and selecting pseudomonas as a functional microorganism to carry out biofilm formation operation, wherein the abundance of the pseudomonas is 30%;

s2, after the film is successfully formed, ensuring that the interior of the reactor is an anaerobic environment and the DO value is 1.2mg/L, and injecting the sewage to be treated into the biological filter reactor for nitrification and denitrification treatment; then adding a carbon source; the grade of the sewage to be treated is first grade B, namely NH in water₃ ^-N is 8mg/L, TN is 18 mg/L; in this process, the Pseudomonas bacteria preferentially oxidize NH₃ ^-N, and then carrying out denitrification treatment.

Finally, the treated water is discharged, and the treated water is tested for NH₃The removal rate of-N can reach 90 percent, the removal rate of TN can reach 60 percent, and NH in the final effluent₃ ^-N at 0.8mg/L, TN at 7.2 mg/L.

Example 2

The present example provides a sewage denitrification process based on pseudomonas, and differs from the example 1 in that:

in step S2, the DO value is 1mg/L and the grade of the sewage to be treated is first grade A, namely NH in water₃ ^-the-N is 5mg/L, the TN is 15mg/L, and a carbon source is added in the process of carrying out the nitrification and denitrification treatment.

Finally, the treated water is discharged, and the treated water is tested for NH₃ ^-The removal rate of-N can reach 80 percent, the removal rate of TN can reach 60 percent, and NH in the final effluent₃ ^-N is 1mg/L, TN is 6 mg/L.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. A sewage denitrification process based on pseudomonas is characterized by comprising the following steps:

step S3, discharging the qualified water;

in the step S1 and the step S2, the interior of the biological filter reactor is not aerated in the whole process and is in an anaerobic environment.

2. The Pseudomonas-based wastewater denitrification process as claimed in claim 1, wherein in step S1 and step S2, DO level in the biofilter reactor is maintained below 2 mg/L.