Aerobic granular sludge stable operation process based on F/M regulation and control

An aerobic granular sludge, stable operation technology, applied in water/sludge/sewage treatment, biological water/sewage treatment, water treatment parameter control, etc. and other problems, to achieve the effect of excellent sedimentation, rich functional flora and stable characters

Active Publication Date: 2017-08-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the aerobic reactor is easy to lose stability and cause the disintegration of granular sludge in the prior art, and to provide a stable operation process of aerobic granular sludge based on F / M regulation

Method used

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  • Aerobic granular sludge stable operation process based on F/M regulation and control
  • Aerobic granular sludge stable operation process based on F/M regulation and control
  • Aerobic granular sludge stable operation process based on F/M regulation and control

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This example is recorded as R1: the reactor is inoculated with a sludge concentration of 2000 mg L -1 , the initial COD is 330mg·L -1 (organic load is 1kgCOD m -3 d -1 ) conditions to start. During the whole operation, the F / M of the system is always maintained at 0.4-0.5kgCOD·kgMLSS -1 d -1 In the range of , the influent load varies with the sludge concentration.

Embodiment 2

[0025] This embodiment is recorded as R2: compared with this embodiment, the only difference is that the F / M of the system is always maintained at 0.1-0.3kgCOD kgMLSS during the entire operation process -1 d -1 within the range, the rest are consistent.

Embodiment 3

[0027] This embodiment is marked as R3: compared with this embodiment, the only difference is that the F / M of the system is always kept at 0.6-0.9kgCOD·kgMLSS during the whole operation process -1 d -1 within the range, the rest are consistent.

[0028] The effects of Examples 1-3 are compared and described below.

[0029] 1. Comparison of sludge concentration

[0030] Such as figure 2 As shown, the MLSS in R1 and R2 has been increasing and the MLSSR1 is higher than that in R2, but the MLSS in R3 began to decline on the 25th day. Mud leads.

[0031] 2. MLVSS / MLSS (representing the proportion of biomass), SVI 5 / SVI 30 (It characterizes particle stability, the larger the value, the worse the sludge stability).

[0032] Such as image 3 As shown, the MLVSS / MLSS in R3 decreased to 0.67 from the 15th day, and the SVI from the 30th day 5 / SVI 30 rose to 1.43. It shows that the settling property of R3 becomes worse.

[0033] 3. Pollutant removal rate

[0034] Such as ...

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Abstract

The invention relates to an aerobic granular sludge stable operation process based on F/M regulation and control. A sequencing batch type bioreactor (SBR) is adopted as a testing device body, the height-diameter ratio ranges from 5 to 10, the volume interchange rate ranges from 30% to 70%, the operation cycle ranges from 4 h to 6 h, and the surficial gas velocity ranges from 1.0 cm.s<-1> to 2.5 cm.s<-1>. The F/M specific value of aerobic granular sludge in a reactor is controlled, the aerobic granular sludge even in size, excellent in sedimentation velocity, stable in structure and rich in flora is formed, long-term efficient and stable operation of the aerobic granular sludge process is achieved, and the problems that the structure of the aerobic granular sludge is prone to unstability in the long-term operation process, and functional bacteria are prone to running off are solved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a stable operation process of aerobic granular sludge based on F / M regulation. Background technique [0002] In the early 1990s, researchers discovered aerobic granular sludge in an aerobic upflow reactor. Granular sludge formed by self-coagulation of functional flora. Compared with activated sludge, aerobic granular sludge has regular shape and compact structure, good settling performance, rich functional flora and high concentration of biomass, and has strong resistance to shock load and toxic substances. Resistance is a new technology with great potential for wastewater biological treatment. However, in long-term operation, aerobic granular sludge is prone to disintegration due to the proliferation of filamentous bacteria, loss of functional bacteria, changes in EPS components, and anaerobic hydrolysis of the core, resulting in reactor instability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/1263C02F2209/005Y02W10/10
Inventor 朱亮吴迪
Owner ZHEJIANG UNIV
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