Multi-stage anoxic and aerobic series biochemical pools and its denitrification method for tannery wastewater

A technology of biochemical pool and level hypoxia, which is applied in animal processing wastewater treatment, aerobic and anaerobic process treatment, etc. It can solve the problem that the content of COD and ammonia nitrogen is difficult to meet the national water quality discharge standard, it is not suitable for leather sewage, and the effect is unstable, etc. problems, to achieve the effects of inhibiting growth and reproduction, facilitating promotion and implementation, and facilitating growth

Active Publication Date: 2015-08-12
河南迪诺环保科技股份有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing anoxic-aerobic biochemical pool has only one set of anoxic pool area and aerobic pool area. This structure has incomplete denitrification and unstable effect, especially in winter. Meet the national water quality discharge standards, so the single-stage anoxic-aerobic biochemical pool structure is not suitable for the treatment of leather sewage with high concentration and high ammonia nitrogen content

Method used

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  • Multi-stage anoxic and aerobic series biochemical pools and its denitrification method for tannery wastewater
  • Multi-stage anoxic and aerobic series biochemical pools and its denitrification method for tannery wastewater
  • Multi-stage anoxic and aerobic series biochemical pools and its denitrification method for tannery wastewater

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Embodiment 1

[0033] see Figure 1 to Figure 4 , in the figure, the multistage anoxic and aerobic series biochemical pool of the present invention is divided into a plurality of strip pools in the biochemical pool, and each strip pool is divided into anoxic pool area 1 and aerobic pool area 2, wherein in the anoxic At least one submersible mixer 3 is installed in the pool area, and a set of aeration pipeline systems with control valves are respectively installed in the anoxic pool area and the aerobic pool area to control the dissolution of different anoxic pool areas and aerobic pool areas. Oxygen content, the anoxic pool area and the aerobic pool area are multi-stage series pool areas, a communication hole 19 is provided between the aerobic pool area of ​​the upper level and the anoxic pool area of ​​the lower level, and the primary anoxic pool area A water inlet pipe 5 is provided on the pool area, and an outlet pipe 6 is provided on the final aerobic pool area. The outlet pipe communica...

Embodiment 2

[0038] The method for denitrification of tannery wastewater by using multi-stage anoxic-aerobic series biochemical pools in Example 1 includes four-stage series-connected anoxic and aerobic treatment, specifically comprising the following steps:

[0039] (1) Pass the wastewater into the multi-stage anoxic and aerobic biochemical pools in series, mix with the activated sludge in the pools, and control the aeration of the biochemical pools at all levels to make the dissolved oxygen reach: the first level anoxic pool area 0~0.3 mg / L, 0.3~0.7 mg / L in the aerobic pool area, 0.2~0.5 mg / L in the second anoxic pool area, 0.5~1.0 mg / L in the aerobic pool area, and the third anoxic pool area 0.3~0.5 mg / L, 0.5~1.2 mg / L in the aerobic pool area, 0.3~2.0 mg / L in the fourth anoxic pool area, 2.0~3.0 mg / L in the aerobic pool area; the control residence time is 48h, the activity The sludge settlement ratio of SV30 is 40%.

[0040] (2) Pass the upper nitrification treatment solution in the fi...

Embodiment 3

[0043] The method for denitrification of tannery wastewater by using multi-stage anoxic-aerobic series biochemical pools in Example 1 includes four-stage series-connected anoxic and aerobic treatment, specifically comprising the following steps:

[0044] (1) Pass the wastewater into the multi-stage anoxic and aerobic biochemical pools in series, mix with the activated sludge in the pools, and control the aeration of the biochemical pools at all levels to make the dissolved oxygen reach: the first level anoxic pool area 0~0.3 mg / L, 0.3~0.7 mg / L in the aerobic pool area, 0.2~0.5 mg / L in the second anoxic pool area, 0.5~1.0 mg / L in the aerobic pool area, and the third anoxic pool area 0.3~0.5 mg / L, 0.5~1.2 mg / L in the aerobic pool area, 0.3~2.0 mg / L in the fourth anoxic pool area, 2.0~3.0 mg / L in the aerobic pool area; the control residence time is 44h, the activity The sludge settlement ratio of SV30 is 43%.

[0045] (2) Pass the upper nitrification treatment liquid in the fina...

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Abstract

The invention belongs to the technical field of leather sewage treatment, and particularly relates to a multi-level anoxic-aerobic series-connection biochemical pool and a method for denitrifying tannery wastewater with the same. The biochemical pool provided by the invention is internally divided into multiple strip pools, and each strip pool is internally divided into an anoxic pool area and an aerobic pool area; the multiple levels of anoxic pool areas and aerobic pool areas are connected in series; communication holes are formed between the previous-level aerobic pool area and the next anoxic pool area; a water inlet pipe is arranged on the primary anoxic pool area, and a water outlet pipe is arranged on the last aerobic pool area and is communicated with a follow-up precipitation pool; a nitrification liquid backflow system is arranged between the last aerobic pool area and the primary anoxic pool area; a sludge backflow system is arranged between the follow-up precipitation pool and the primary anoxic pool area. The denitrifying method provided by the invention realizes thorough denitrification and a stable effect and is particularly suitable for treatment of tannery wastewater with high concentration and high ammonia nitrogen content.

Description

technical field [0001] The invention belongs to the technical field of leather sewage treatment, and in particular relates to a multi-stage anoxic-aerobic series biochemical pool and a method for denitrification of tanning wastewater. Background technique [0002] The existing anoxic-aerobic biochemical pool has only one set of anoxic pool area and aerobic pool area. This structure has incomplete denitrification and unstable effect, especially in winter. It meets the national water quality discharge standard, so the single-stage anoxic-aerobic biochemical pool structure is not suitable for the treatment of leather sewage with high concentration and high ammonia nitrogen content. Therefore, it is very necessary to study an anoxic and aerobic production pond that can be fully applied to leather sewage treatment. [0003] Chinese patent CN102126817B discloses an AO high-efficiency denitrification and phosphorus removal system. The biological pool is sequentially equipped with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F103/24
Inventor 范长华王万强郭俊李江伦范帅
Owner 河南迪诺环保科技股份有限公司
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