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Early warning and control method of sludge floating in secondary settling tank of sewage treatment system

A technology of sewage treatment system and control method, which is applied in the direction of water treatment parameter control, biological water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problems of high cost, inconvenient operation control, and affecting the amount of sludge in the aeration tank and other problems, to achieve good treatment effect, reduce operating costs and investment, and reduce the probability of sludge floating

Active Publication Date: 2017-01-04
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it will make the separation effect of mud and water worse, and the concentration of organic matter and suspended solids in the effluent will increase. On the other hand, it will affect the normal amount of sludge required in the aeration tank, which will bring great difficulties to the operation and control of the sewage treatment plant.
[0003] There are many reasons for the sludge to float up, and it takes a long time to analyze the reasons, which brings a lot of inconvenience to the operation control
At present, the activated sludge flotation control method is adopted after a large amount of activated sludge flotation occurs, which has obvious hysteresis effect, not only high investment cost, but also unsatisfactory effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1, a sewage treatment system secondary sedimentation tank sludge floating warning and control method, the steps are as follows:

[0070] (1) Establish an early warning classification for sludge floating in the secondary settling tank in the sewage treatment system; according to the ratio of the floating sludge covering area of ​​the secondary settling tank to the surface area of ​​the tank, that is, the coverage, the proportion of black and brown in the color of activated sludge The ratio and the number of filamentous microorganisms are used as the basis for classification, and are divided into three levels; of which:

[0071] When the coverage of floating sludge in the secondary settling tank is less than 30%, the amount of black in the color of activated sludge accounts for more than 70% (inclusive), and the number of filamentous microorganisms is small, it is a first-level warning, which is the initial stage of sludge floating;

[0072] When the coverage o...

Embodiment 2

[0092] Embodiment 2, a kind of sewage treatment system secondary settling tank sludge floating warning and control method described in embodiment 1, its steps are as follows:

[0093] (1) Establish the early warning classification of sludge floating in the secondary sedimentation tank in the sewage treatment system; the method is the same as that in Example 1;

[0094] (2) According to the early warning classification, the following methods are adopted for control:

[0095] At Level 1, the following control methods are used:

[0096] ① Increase the nitrification liquid return pump to maintain the nitrification liquid return ratio at 3:1;

[0097] ② Increase the sludge return pump in the secondary settling tank to maintain the sludge return ratio at 1:1;

[0098] ③Reduce the biological aeration rate of the aerobic tank to maintain the dissolved oxygen concentration at 4mg / L;

[0099] In the second level of alert, the following control methods are adopted:

[0100] ① Increas...

Embodiment 3

[0111] Embodiment 3, a kind of sewage treatment system secondary settling tank sludge floating warning and control method described in embodiment 1, its steps are as follows:

[0112] (1) Establish the early warning classification of sludge floating in the secondary sedimentation tank in the sewage treatment system; the method is the same as that in Example 1;

[0113] (2) According to the early warning classification, the following methods are adopted for control:

[0114] At Level 1, the following control methods are used:

[0115] ① Increase the nitrifying liquid return pump to maintain the nitrifying liquid return ratio at 1.5:1;

[0116] ② Increase the sludge return pump in the secondary settling tank to maintain the sludge return ratio at 0.6:1;

[0117] ③ Reduce the amount of biological aeration in the aerobic tank to maintain the dissolved oxygen concentration at 2.5mg / L;

[0118] In the second level of alert, the following control methods are adopted:

[0119] ① I...

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Abstract

The invention discloses a secondary sedimentation tank sludge floatation alarming and controlling method for a sewage treatment system and belongs to the technical field of environmental wastewater treatment. Through awarning classification of the secondary sedimentation tank sludge floatation in the sewage treatment system is built and based on the proportion of the cover area of the secondary sedimentation tank floated sludge in the tank surface area, namely, cover degree, the occupied ratio of the black number and the dark brown color number in the activated sludge, the number of the filamentous microorganism as classifying basis, the secondary sedimentation tank floated sludge is divided into three stages and is controlled by adopting a method according to the alarming classification. According to the invention, alarming is carried out at the initial stage of the sludge floatation, the floatation of the sludge is eliminated at the initial stage by respectively adopting different strategies, so as to greatly reduce the probability of sludge floatation, and the method disclosed by the invention is a feasible, economic and effective method. Through three-stage alarming system, different control measures are adopted for sludge flotation, so that the operation cost and expense input of a sewage treatment plant are greatly reduced, and treatment effect is good.

Description

technical field [0001] The invention belongs to the technical field of environmental wastewater treatment, and in particular relates to an early warning and control method for sludge floating in a secondary settling tank of a sewage treatment system. Background technique [0002] Activated sludge method is the most widely used sewage biological treatment technology in sewage treatment plants and has great potential for development. Due to its own reasons or external reasons, the relative density of the activated sludge is less than 1, and it floats up to the surface of the secondary sedimentation tank, causing the sludge to float up. On the one hand, the sludge-water separation effect will be deteriorated, and the concentration of organic matter and suspended solids in the effluent will increase. On the other hand, it will affect the normal amount of sludge required in the aeration tank, which will bring great difficulties to the operation and control of the sewage treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCC02F3/1205C02F2209/40C02F2303/04Y02W10/10
Inventor 张彬彬田凤蓉陈克雷郭志涛杨志林云干刘德敏王开春
Owner BLUESTAR LEHIGH ENG INST CO LTD
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