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Method for effectively controlling sludge bulking caused by chlorine resistant filamentous bacteria

A technology of sludge bulking and filamentous bacteria, which is applied in the fields of sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve the effect of restoring sludge settling.

Inactive Publication Date: 2013-08-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for effectively controlling sludge bulking caused by chlorine-resistant filamentous bacteria to effectively solve the sludge bulking caused by a class of Type021N filamentous bacteria that cannot be killed by chlorine

Method used

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  • Method for effectively controlling sludge bulking caused by chlorine resistant filamentous bacteria
  • Method for effectively controlling sludge bulking caused by chlorine resistant filamentous bacteria
  • Method for effectively controlling sludge bulking caused by chlorine resistant filamentous bacteria

Examples

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Effect test

Embodiment 1

[0017] Example 1: Malignant sludge bulking A / O reactor induced by low substrate concentration combined with low DO. At that time, the SVI of the sludge in the reactor was as high as 700mL / g, and there was obvious sludge loss in the secondary settling tank, and the MLSS concentration in the reactor showed an obvious downward trend. figure 1 The expansion state of the sludge in the A / O reactor and the time node of taking the sludge for the batch test of adding chemicals are given. Staining and FISH identification of filamentous bacteria showed that the dominant filamentous bacteria were mainly Type021N and S.natans, and the filamentous bacteria index was 4-5.

[0018] A part of the sludge was taken out from the bottom of the secondary sedimentation tank of the A / O reactor, and the supernatant was discarded after the sludge was centrifuged at 2000rmp for 2min. Finally, the sludge was divided into several parts according to the same amount, and put into 1.5L test device respectiv...

Embodiment 2

[0029] Low substrate concentration combined with low DO-initiated malignant sludge bulking A / O reactor. At that time, the SVI of the sludge in the reactor was as high as 700mL / g, and there was obvious sludge loss in the secondary settling tank, and the MLSS concentration in the reactor showed an obvious downward trend. Staining and FISH identification of filamentous bacteria showed that the dominant filamentous bacteria were mainly Type021N, and the filamentous bacteria index was 5. After passing the batch test adopted in Example 1, the results showed that the type 021N filamentous bacteria contained in the bulking sludge is a chlorine-resistant filamentous bacteria. Therefore, half a month after the sludge bulking in the A / O reactor, the CTAB agent was added in the influent anoxic zone of the A / O reaction at the dosage of 30mgCTAB / gMLSS, and only 1 Once, within 5 days, it was found that the SVI in the A / O reactor decreased to 200mL / g, and the filamentous bacteria index decre...

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Abstract

The invention discloses a method for effectively controlling sludge bulking caused by chlorine resistant filamentous bacteria and belongs to the field of crossing between the environment engineering technology and the environmental microbial technology. Cetyl trimethyl ammonium bromide (CTAB) is added to sludge containing chlorine resistant filamentous bacteria, wherein the CTAB is a cation sterilization agent which has excellent performances including surface activity, stability, sterilization property, biological degradability and the like; the agent can be sufficiently penetrated to the inner parts of cell walls of the filamentous bacteria, so that the sterilization effect is generated to the target filamentous bacteria. The added CTAB has a better sterilization effect on chlorine resistant Type021N; when the adding amount is bigger than 20mgCTAB / gMLSS, the chlorine resistant filamentous bacteria with filamentous bacteria index being higher than 3 can be quickly killed, so that the interference to the activity of bacteria micelle is small, and therefore, the problem that the sludge bulking caused by the Type021N filamentous bacteria, which cannot be killed by chlorine, can be effectively solved.

Description

technical field [0001] The invention belongs to the interdisciplinary field of environmental engineering technology and environmental microbial technology, and relates to the prevention and control of filamentous bacteria sludge bulking in activated sludge sewage treatment systems. In particular, a new filamentous bacteria biocide CTAB is proposed. Type021N with CTAB added against chlorine has a good bactericidal effect. When the dosage is greater than 20mgCTAB / gMLSS, it can quickly kill the chlorine-resistant filamentous bacteria with a filamentous bacteria index above 3, while the bacterial gel group The effect of the activity is small, and it effectively solves the sludge bulking caused by a type of Type021N filamentous bacteria that cannot be killed by chlorine. Background technique [0002] The methods for preventing and controlling sludge bulking can be divided into two categories: one is specific method with specific aim; the other is non-specific method with no speci...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 彭永臻郭建华王淑莹杨雄
Owner BEIJING UNIV OF TECH
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