Method for inhibiting sludge bulking in secondary sedimentation tank

A technology of sludge bulking and secondary settling tanks, which is applied in chemical instruments and methods, water/sludge/sewage treatment, feeding/discharging devices of settling tanks, etc., can solve problems such as uneconomical, practical, and complicated, and achieve Effects of improving clarity, inhibiting sludge bulking and floating, and inhibiting viscous expansion

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

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  • Method for inhibiting sludge bulking in secondary sedimentation tank
  • Method for inhibiting sludge bulking in secondary sedimentation tank

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The height of the secondary settling tank adopted 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 liquid level of the secondary sedimentation tank, the angle a between the bell mouth and the water inlet pipe 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 from the bottom of the settling tank is 0.1m. Set 4 support frames 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 sedimentation tank is 0.1m . Two rings of aeration coils are fixed on the support frame. A dissolved oxygen meter is installed inside the sleeve to monitor and control the dissolved oxygen...

Embodiment 2

[0028] Process and operating conditions are the same as in Example 1. The difference is: when the measured SVI value is 200mg / L, take another sample for measurement after 10 minutes, and the SVI value is 280mg / L. At this time, the sewage in the sleeve is B:N=100:3, B:P=100:0.3, and additional Potassium dihydrogen phosphate makes B:P=100:0.6. At this time, the aeration system is turned on, and after repeating 6 groups, the dissolved oxygen concentration in the sleeve is stable at about 2.5mg / L, and the SVI value of the sewage is 120mg / L. Compared with the treatment effect of Example 1, the sludge quality is better, the treatment effect is also improved, and the number of aeration groups can be reduced.

Embodiment 3

[0030] The height of the secondary settling tank adopted 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 liquid level of the secondary sedimentation tank, the angle a between the bell mouth and the water inlet pipe wall is 30°, the horizontal projection length of the bell mouth is 0.1m, and the distance from the bottom of the bell mouth is 2 The vertical distance at the bottom of the settling tank is 0.12m. Set 4 support frames at intervals around the water inlet pipe, the angle b between the support frame and the water inlet pipe wall is 30°, the horizontal projection length of the support frame is 0.08m, and the distance from the bottom of the support frame to the bottom of the secondary sedimentation tank is 0.12m . Two rings of aeration coils are fixed on the support frame. A dissolved oxygen meter is installed inside the sleeve to monitor and control the dissolved oxygen concentration...

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Abstract

The invention relates to a method for inhibiting sludge bulking in a secondary sedimentation tank. Water flows in from the bottom of the secondary sedimentation tank along a direction from bottom to top and flows out from the periphery of the secondary sedimentation tank; a hollow cylindrical sleeve is arranged around a water inlet pipe; and the bottom end of the sleeve is a bell mouth. Sewage tobe discharged into the secondary sedimentation tank enters from the bottom of the secondary sedimentation tank, flows out from the periphery of the top of the water inlet pipe, then downwardly passesthrough the bell mouth of the sleeve, diffuses towards the outer upper part and the periphery of the sleeve, and is finally discharged from a water outlet in the top of the secondary sedimentation tank; when sludge swells, the sleeve is used for preventing the expanded sludge from floating towards the top and the edges of the secondary sedimentation tank; an inclined bracing frame is arranged at the periphery of the bottom end of the water inlet pipe and provided with an aeration system which is used for alternate exposure to air and chlorine and suppression of sludge bulking; and after aeration is stopped, settled sludge flows out from the bell mouth and is discharged from a sludge discharging pipe. The method provided by the invention employs the secondary sedimentation tank with an improvement structure, eliminates non-filamentous bacteria and toxic substances, utilizes filamentous bacteria as a skeleton to promote the growth of zoogloea on the filamentous bacteria, effectively suppresses sludge bulking and floating and guarantees the clarity of yielding water.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for inhibiting sludge expansion in a secondary settling tank. Background technique [0002] Activated sludge process is a sewage biological treatment technology widely used in sewage treatment. The secondary settling tank is an important part of the activated sludge system. Its main function is to separate the sludge, clarify the mixed solution, concentrate and return the activated sludge. Its working effect can directly affect the effluent water quality and return sludge concentration of the activated sludge system. The secondary sedimentation tanks of large and medium-sized sewage treatment plants mostly adopt the circular radial flow type of mechanical suction mud, medium-sized sewage treatment plants also adopt the multi-bucket advection type, and small sewage treatment plants mostly adopt the vertical flow type. [0003] The activated sludge s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/02B01D21/24C02F3/12
CPCB01D21/02B01D21/24C02F3/1215C02F2203/002C02F2303/20Y02W10/10
Inventor 赵胜楠高会杰孙丹凤郭志华
Owner CHINA PETROLEUM & CHEM CORP
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