Roller shutter type recycle-ratio-adjustable oxidation ditch device and operation method thereof

A circulation ratio and oxidation ditch technology, applied in chemical instruments and methods, aerobic and anaerobic process treatment, water/sewage multi-stage treatment, etc., can solve the problem of unadjustable circulation ratio, fixed flow area, and difficult nitrogen removal Phosphorus and other problems, to achieve the effect of saving oxygen consumption, saving construction costs, high removal rate

Inactive Publication Date: 2013-07-03
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the existing oxidation ditch process technology, there is an insert plate with a certain aperture in the circulation corridor, but the flow area of ​​the insert plate is fixed, so for such an oxidation ditch process, the circulation ratio cannot be adjusted. is also a fixed value
[0011] In summary, the following problems exist in the existing oxidation ditch technology: the circulation ratio has not become an effective controllable process operation parameter, so it is difficult to use the oxidation ditch technology that does not add chemicals and only relies on the microbial degradation of activated sludge. Nitrogen and phosphorus removal at the same time to achieve a higher removal rate

Method used

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  • Roller shutter type recycle-ratio-adjustable oxidation ditch device and operation method thereof
  • Roller shutter type recycle-ratio-adjustable oxidation ditch device and operation method thereof
  • Roller shutter type recycle-ratio-adjustable oxidation ditch device and operation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Water inflow 50L / h, hydraulic retention time HRT=12h, sludge reflux ratio RS=100%, sludge age SRT=12d, mixed liquor sludge concentration MLSS=4000mg / L, water quality and removal The effect is shown in Table 2.

[0040] Table 2 The decontamination effect of different opening degrees of the oxidation ditch device with adjustable circulation ratio of rolling gate

[0041]

Embodiment 2

[0043] Water intake 50L / h, hydraulic retention time HRT=12h, sludge return ratio R S =100%, sludge age SRT=12d, mixed liquor sludge concentration MLSS=4000mg / L, see Table 3 for the water quality and removal effect of the influent water of the device and the effluent water of the sedimentation tank.

[0044] Table 3 The decontamination effect of different opening degrees of the oxidation ditch device with adjustable circulation ratio of rolling gate

[0045]

Embodiment 3

[0047] Water intake 60L / h, hydraulic retention time HRT=10h, sludge return ratio R S =100%, sludge age SRT=12d, mixed liquid sludge concentration MLSS=4000mg / L, see Table 4 for the water quality and removal effect of the influent water of the device and the effluent water of the sedimentation tank.

[0048] Table 4 The decontamination effect of different opening degrees of the oxidation ditch device with adjustable cycle ratio of rolling gate

[0049]

[0050] In the test stage, the shutter is completely closed, and the mud-water mixture only passes through the bottom channel of the shutter. At this time, the minimum opening degree γ is 0.03. When the shutter is fully opened, the maximum opening degree γ is 1; Within the optimal adjustment range of 0.2≤γ≤0.6, the effluent water quality of the sedimentation tank can reach the first-class B standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002)". At this time, the effluent from the sed...

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Abstract

The invention discloses a roller shutter type recycle-ratio-adjustable oxidation ditch device and an operation method thereof. The device comprises an anaerobic tank (2), an oxidation ditch tank (3) and a sedimentation tank (4), wherein a stirrer (9) is arranged in the anaerobic tank (2), the oxidation ditch tank (3) is divided into an aerobic zone and an anoxic zone, a roller shutter type recycle ratio adjustment devices (12) is arranged at the starting end of each of the aerobic zone and the anoxic zone respectively, a high-speed rotary brush (11) is arranged in the aerobic zone, and a low-speed rotary brush (10) is arranged in the anoxic zone. The roller shutter type recycle-ratio-adjustable oxidation ditch device has the advantages that decontamination effect of an oxidation ditch canbe remarkably improved only by adjusting the recycle ratio without changing other running parameters and using chemical agents, and nitrogen and phosphorus removal can be achieved while the removal rate is high. Compared with other activated sludge processes capable of achieving the same processing effect, the roller shutter type recycle-ratio-adjustable oxidation ditch device can save oxygen consumption and power consumption.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in environmental engineering, and relates to a rolling shutter type oxidation ditch device with adjustable circulation ratio and an operating method thereof. Background technique [0002] In 1954, the world's first oxidation ditch sewage treatment plant was established in the Netherlands, after decades of development. At present, the circulation ratio (the ratio of the circulation flow through the section of the circulation corridor to the influent flow) is not used as a process design parameter in the oxidation ditch process design specifications or manuals. During the design process, design parameter values ​​such as sludge concentration, sludge load, and sludge age are often selected according to design specifications or manuals, and then the volume required for the oxidation ditch is calculated, and finally the corridor of the oxidation ditch is determined according to the requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 于静洁郑淑平王少坡
Owner TIANJIN URBAN CONSTR COLLEGE
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