Unlock instant, AI-driven research and patent intelligence for your innovation.

A secondary settling tank with improved structure and its method for inhibiting the growth of filamentous bacteria

A secondary sedimentation tank, filamentous bacteria technology, applied in chemical instruments and methods, sedimentation tanks, biological treatment devices, etc., can solve the problem of the concentration and quality of return sludge, the difficulty of sewage treatment operation and control, and the impact on the pollution of aeration tank. Sludge volume and other issues to achieve the effect of avoiding sludge loss, preventing and inhibiting growth, and improving clarity

Active Publication Date: 2020-07-03
CHINA PETROLEUM & CHEM CORP +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The activated sludge settled in the secondary settling tank is usually at the bottom of the tank, and the concentration of dissolved oxygen is low, so it is prone to sludge swelling, and the expanded sludge will float to the surface of the secondary settling tank. (SS) concentration exceeds the standard; on the other hand, it reduces the concentration and quality of the return sludge, which affects the normal amount of sludge required in the aeration tank, and brings great difficulties to the operation and control of sewage treatment
However, this method uses the naked eye to observe the proportion of the floating sludge coverage area of ​​the secondary settling tank to the surface area of ​​the tank, the proportion of the black quantity and the brown quantity in the activated sludge color, which is easy to cause errors, and the method is very complicated to implement and needs to be constantly Changing process parameters such as reflux ratio is not economical and practical

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A secondary settling tank with improved structure and its method for inhibiting the growth of filamentous bacteria
  • A secondary settling tank with improved structure and its method for inhibiting the growth of filamentous bacteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The height of the secondary sedimentation tank used in this embodiment is 0.5m and the diameter is 1m. The diameter of the sleeve is 0.18m, the top of the sleeve is 0.4m higher than the highest liquid level of the secondary settling tank, the angle a between the bell mouth and the sleeve wall is 60°, the horizontal projection length of the bell mouth is 0.085m, and the distance between the bottom end of the bell mouth is 2 The vertical distance of the lowest point at the bottom of the sink is 0.1m. Four support frames are arranged at intervals around the water inlet pipe, the angle b between the support frame and the water inlet pipe wall is 60°, the horizontal projection length of the support frame is 0.072m, and the distance from the bottom end of the support frame to the bottom of the secondary settling tank is 0.1m . Two circles of aeration coils are fixed on the support frame. A dissolved oxygen meter is installed inside the sleeve to monitor and control the diss...

Embodiment 2

[0030] The height of the secondary sedimentation tank used in this embodiment is 0.5m and the diameter is 1m. The diameter of the sleeve is 0.25m, the top of the sleeve is 0.3m higher than the highest liquid level of the secondary settling tank, the angle a between the bell mouth and the sleeve wall is 30°, the horizontal projection length of the bell mouth is 0.1m, and the distance between the bottom end of the bell mouth is 2 The vertical distance of the lowest point at the bottom of the sink is 0.12m. Four supporting frames are arranged at intervals around the water inlet pipe, the angle b between the supporting frame and the water inlet pipe wall is 30°, the horizontal projection length of the supporting frame is 0.08m, and the distance from the bottom end of the supporting frame to the bottom of the secondary settling tank is 0.12m . Two circles of aeration coils are fixed on the support frame. A dissolved oxygen meter is installed inside the sleeve to monitor and contr...

Embodiment 3

[0033] The invention is used to improve the secondary sedimentation tank of a sewage treatment plant. The height of the secondary sedimentation tank is 0.5m and the diameter is 1m. The bottom of the water is fed from bottom to top and the water is discharged from all sides. A hollow cylindrical sleeve is set around the water inlet pipe. The diameter of the sleeve is 0.2m. The top of the sleeve is 0.5m above the highest liquid level of the secondary sedimentation tank. The angle a with the inlet pipe wall is 45°, the bottom end of the sleeve is a bell mouth, the horizontal projection length of the bell mouth is 0.1m, and the vertical distance between the bottom end of the bell mouth and the bottom of the secondary sedimentation tank is 0.1m. An inclined support frame is arranged around the bottom end of the water inlet pipe, and four support frames are arranged at intervals around the water inlet pipe. The angle b between the support frame and the wall of the water inlet pipe is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
heightaaaaaaaaaa
Login to View More

Abstract

The invention relates to a secondary sedimentation tank with an improved structure. The form of feeding water from bottom to top and draining water from periphery on the bottom part is adopted; a hollow cylindrical sleeve is arranged on the periphery of a water feeding pipe; a horn opening is formed at the bottom end of the sleeve; an inclined support frame is arranged on the periphery of the bottom end of the water feeding pipe; an aerating system is arranged on the support frame; a sludge discharging hole is located below the support frame; when filamentous bacteria are generated, the sleeve is used for stopping the filamentous bacteria to float toward the edge; when aeration is started, a local aerating space is formed in the sleeve and sludge floats following bubbles; after the aeration is stopped, settling sludge flows out from the horn opening of the sleeve and then is discharged from a sludge discharging pipe. According to the invention, an existing secondary sedimentation tank structure is modified, so that the growth of filamentous bacteria can be timely prevented and restrained, the sludge expansion and floating can be avoided, no drug is needed, the sludge loss can be avoided and the clarity of discharged water can be effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a secondary sedimentation tank with an improved structure and a method for inhibiting the growth of filamentous bacteria. Background technique [0002] Activated sludge process is a sewage biological treatment technology widely used in sewage treatment. The secondary sedimentation tank is an important part of the activated sludge system, and its main function is to separate the sludge, clarify, concentrate and return the activated sludge to the mixed liquid. Its working effect can directly affect the effluent quality and return sludge concentration of the activated sludge system. The secondary sedimentation tanks of large and medium-sized sewage treatment plants mostly use circular radial flow with mechanical suction, medium-sized sewage treatment plants also use multi-bucket advection flow, and small sewage treatment plants mostly use vertical flow. [000...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/02
CPCC02F1/24C02F1/52C02F3/1215C02F3/1221C02F2203/006C02F2209/22Y02W10/10
Inventor 赵胜楠高会杰孙丹凤郭志华
Owner CHINA PETROLEUM & CHEM CORP