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Sewage denitrification process based on bacillus

A bacillus and sewage technology, which is applied in the field of sewage denitrification technology based on bacillus, can solve the problems of denitrification efficiency reduction and denitrification process instability, so as to avoid the instability of bacterial group structure, realize denitrification, The effect of stabilizing denitrification

Pending Publication Date: 2021-01-22
NANJING FRONTIER ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual biological denitrification process, the water in the front-end aerobic nitrification tank will contain a large amount of O 2 Entering the denitrification tank in the back stage, the O 2 Even in a short period of time, it will inhibit the denitrification bacteria, causing the denitrification process to be unstable, resulting in a decrease in denitrification efficiency

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  • Sewage denitrification process based on bacillus

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Embodiment 1

[0020] like figure 1 As shown, this embodiment provides a Bacillus-based sewage denitrification process, which is applied to upgrade the tail water of sewage plants in summer, and upgrade the tail water of grade B to grade A standard.

[0021] The process specifically includes:

[0022] Step S1, hang the bacillus in the first-level aerated biological filter, the second-level anoxic biological filter and the third-level anaerobic biological filter. In this embodiment, the bacillus is Bacillus licheniformis, and each biological The abundance of Bacillus in the filter was 40%.

[0023] Step S2, after successful film formation, the sewage to be treated is pumped into the primary aerated biological filter for nitrification reaction, specifically, the NH in the sewage to be treated 3 -N is 8mg / L, TN is 18mg / L, which is NH 3 - -N and TN are first-level B; specifically, in this embodiment, it is necessary to ensure that the DO value in the first-level biological aerated filter is ...

Embodiment 2

[0028] This embodiment provides a process for denitrification of sewage based on bacillus. The same process is applied to upgrade the tail water of sewage plants in summer, and upgrade the tail water of Class A to Class IV water standard.

[0029] This embodiment is different from implementation 1 in that:

[0030] In step S2, the NH in the sewage to be treated 3 -N is 5mg / L, TN is 15mg / L, which is NH 3 - -N and TN are first-level A initially, and the DO value in the first-level biological aerated filter is 4mg / L; at this time, the nitrification reaction is mainly carried out, and the NH 3 -N removal rate can reach 80%.

[0031] In step S3, the DO values ​​in the secondary anoxic biological filter and the tertiary anaerobic biological filter are 1 mg / L, and carbon sources are added to the secondary anoxic biological filter.

[0032] In step S4, the treated water is discharged, and the NH in the water finally discharged after detection 3 - -N at 1mg / L, TN at 6mg / L, NO 3 ...

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Abstract

The invention discloses a sewage denitrification process based on bacillus. The process comprises the following steps: S1, carrying out biofilm formation on bacillus in a primary biological aerated filter, a secondary anoxic biological filter and a tertiary anaerobic biological filter with abundance of 30-50%; s2, after the biofilm formation is successful, inputting the sewage to be treated into the primary biological aerated filter for nitration reaction; s3, sequentially inputting the sewage subjected to the nitration reaction into the secondary anoxic biofilter and the tertiary anaerobic biofilter for denitrification reaction; meanwhile, adding a carbon source into the secondary anoxic biological filter; and S4, discharging the qualified water after treatment. Compared with the prior art, the functional microorganisms adopted by the invention are bacillus, and the facultative characteristic of the functional microorganisms can be utilized to avoid the problem of unstable flora structure caused by the inhibition effect of residual O2 on denitrifying flora in the aerobic and anaerobic condition switching process, thereby finally realizing the stable denitrification effect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a bacillus-based sewage denitrification process. Background technique [0002] Traditional biological denitrification is mainly achieved through two steps. First, microorganisms convert NH under aerobic conditions 3 -N gradually oxidized to NO 2 - -N to NO 3 - -N. Then under anaerobic conditions, the NO 3 - -N reverts to NO 2 - -N to N 2 . Finally, denitrification of sewage is realized. The former step mainly relies on the nitrifying bacteria to realize the nitrification reaction, and the latter step mainly uses the denitrifying bacteria to carry out the denitrification reaction. [0003] Traditional nitrification-denitrification is currently the main measure to control TN in water bodies, but there is a common problem of low treatment efficiency. The selection of functional microorganisms is the main factor determining the efficiency of biological nitrogen...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C02F101/16C02F101/38
CPCC02F3/305C02F3/303C02F3/34C02F2101/16C02F2101/38
Inventor 宋晨闫杰王晨马俊
Owner NANJING FRONTIER ENVIRONMENTAL TECH