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Immobilized-cultivation method for aerobic granular sludge

An aerobic granular sludge and immobilized culture technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. The factors and conditions affected are the same and uncertain, and the organic wastewater load fluctuates strongly, etc., to achieve the effect of shortening the start-up time, small footprint, and less residual sludge

Active Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Since the first discovery of aerobic granular sludge, the research time in this field is only 20 years. The research on the influencing factors and operating conditions of the aerobic granular sludge cultivation stage is not deep enough, and there are still great controversies in many aspects.
Moreover, there are few reports on the rapid cultivation of aerobic granular sludge that can withstand load fluctuations, and it is not certain whether the factors and conditions that affect it are the same as those at the start of the cultivation.
[0010] Therefore, in view of the existing problems such as long cultivation time of granular sludge and strong fluctuation of organic wastewater load, it is necessary to develop a rapid cultivation of aerobic granular sludge that requires short cultivation time and is suitable for load fluctuation environment. method

Method used

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  • Immobilized-cultivation method for aerobic granular sludge
  • Immobilized-cultivation method for aerobic granular sludge
  • Immobilized-cultivation method for aerobic granular sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Cultivate aerobic activated sludge:

[0051] Take the activated sludge from the secondary sedimentation tank of a sewage treatment plant, inoculate it in the first reactor with a height-to-diameter ratio of 15:1 and an effective volume of 4L according to the amount of 5g / L, and cultivate it with no-load aeration at an aeration rate of 25L / h , after 72 hours of aeration, settling for 30 minutes, and discharging the supernatant to obtain aerobic activated sludge.

[0052] (2) Preparation of culture medium

[0053] Prepare simulated wastewater with BOD: TN: TP = 100: 50: 1, wherein COD is 100 mg / LBOD is 90 mg / L, TN content is 45 mg / L, and TP content is 0.9 mg / L.

[0054] The nutrient element solution was prepared, and its composition is shown in Table 2.

[0055] Table 2

[0056]

[0057] (3) Cultivate aerobic activated sludge seed particles

[0058] Get the aerobic activated sludge that 25wt% step (1) makes, put into aspect ratio 15: 1, in the second reactor of...

Embodiment 2

[0070] The difference between embodiment 2 and embodiment 1 is: no step (4), and

[0071] Step (1) The activated sludge is inoculated into the first reactor with an aspect ratio of 4:1 and an effective volume of 6L according to the amount of 9g / L; the aeration rate is 1750L / h, the aeration is 60h, and the sedimentation is 40min.

[0072] Step (2) Prepare simulated wastewater with BOD:TN:TP=100:25:31, wherein COD is 300mg / L, BOD is 270mg / L, TN content is 67.5mg / L, and TP content is 2.7mg / L.

[0073] Step (3) Take 40wt% of the aerobic activated sludge obtained in step (1), put it into a second reactor with an aspect ratio of 4:1 and an effective volume of 3L, and add 1.05L of simulated wastewater and 10.5ml of nutrients. No flocculant is added, aluminum sulfate crosslinking agent is added according to the amount of 20 mg / L, and sodium alginate hydrogel particle carrier is added according to the amount of 40 mg / L.

[0074] The aeration rate of the aeration process is 1750L / h, th...

Embodiment 3

[0080] The difference between embodiment 3 and embodiment 1 is: no step (4), and

[0081] Step (1) The activated sludge is inoculated into the first reactor with an aspect ratio of 6:1 and an effective volume of 8L according to the amount of 7g / L; the aeration rate is 300L / h, the aeration is 70h, and the sedimentation is 45min.

[0082] Step (2) prepare simulated waste water of BOD:TN:TP=100:5:3, wherein COD is 500mg / L, BOD is 450mg / L, TN content is 90mg / L, TP content is 54mg / L.

[0083] Step (3) Add 2.8L of simulated wastewater and 28ml of nutrient elements into the second reactor with an aspect ratio of 6:1 and an effective volume of 4L, and add polyferric sulfate chloride flocculant according to the amount of 30mg / L. The amount of glutaraldehyde cross-linking agent was added, and the sodium alginate hydrogel particle carrier was added according to the amount of 20mg / L.

[0084] The aeration rate of the aeration process is 300L / h, the surface gas velocity in the reactor is ...

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Abstract

The invention relates to a rapid cultivation method for aerobic granular sludge in waste water with higher organic load fluctuation. In the method, through a special cultivation technology that at first, the immobilized-cultivation is conducted on multiple microbes in activated sludge so as to obtain early-stage seed grains of sludge, and then the grains are promoted to further grow rapidly with the addition of an agglomerator and / or a dominant consortium, the aerobic granular sludge with high activity and strong load fluctuation tolerance is obtained successfully in objective waste water. The aerobic granular sludge is suitable for various kinds of organic sewage with higher organic load fluctuation.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment, and relates to a rapid cultivation method of aerobic granular sludge used for wastewater with strong organic load fluctuation. Background technique [0002] Since the last century, with the rapid increase of the global population and the rapid development of industrial production, the increasingly serious water pollution has gradually threatened the survival and development of human beings. Therefore, water pollution prevention and treatment technologies have emerged in response to the situation. is also becoming more widespread. The biodegradation method is the most economical and effective method to remove organic matter in wastewater. Among them, the activated sludge method is the most widely used, but the further development is restricted due to the following main shortcomings: 1. Due to the poor settling performance of flocculent activated sludge , the sludge concentration and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 苏海佳刘鑫代雅洁谭天伟
Owner BEIJING UNIV OF CHEM TECH
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