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Method for fixing epiphyte in sewage treatment process

A technology for sewage treatment and fixation, which is applied in biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., and can solve problems such as poor sedimentation performance, sludge bulking, and difficulty in solid-liquid separation. achieve good results

Inactive Publication Date: 2011-03-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the biggest difficulty of fungi in sewage treatment is that their sedimentation performance is extremely poor, which makes solid-liquid separation difficult and even sludge bulking, which makes it difficult for fungi to be retained as dominant bacteria in the sewage treatment process. Therefore, the current common practice is either Either a membrane separation device is used in the bioreactor, or the method of embedding with resin and other materials allows the fungus to grow in the reactor without flowing out with the effluent, resulting in the loss of the fungus. This process is called fungal immobilization
Although the above two methods can prevent the loss of fungi, there is a problem of high cost in the above two methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ①Put the activated sludge with a concentration of 3000mg / l inoculated in the existing sewage treatment plant into a cylindrical reactor (the diameter of the reactor is 5cm, and the height is 100cm), and the volume of the sludge is 50% of the working volume;

[0020] ②The reactor is fed with water for 5 minutes (the volume of the water is 50% of the total volume), after aeration (the aeration rate ensures that the dissolved oxygen in the water is 6-8mg / L, and the gas rising speed is 3cm / s), the initial static settling In 15 minutes, the upper part of the liquid after the precipitation in the reactor after the static settling was discharged (the volume of the drained liquid water accounts for 50% of the total volume); repeat the previous steps, and the static settling time shortens by 1 minute every 2 days in the above-mentioned repetition process, until shortened to 5 minutes and no longer changed;

[0021] ③When sludge in the form of particles with a diameter of about 0...

Embodiment 2

[0023] ①Put the activated sludge with a concentration of 4000mg / l inoculated in the existing sewage treatment plant into a cylindrical reactor (the diameter of the reactor is 5cm, and the height is 100cm), and the volume of the sludge is 50% of the working volume;

[0024] ②The reactor is fed with water for 5 minutes (the volume of the water is 50% of the total volume), after aeration (the aeration rate ensures that the dissolved oxygen in the water is 6-8mg / L, and the gas rising speed is 3cm / s), the initial static settling In 15 minutes, the upper part of the liquid after the precipitation in the reactor after the static settling was discharged (the volume of the drained liquid water accounts for 50% of the total volume); repeat the previous steps, and the static settling time shortens by 1 minute every 2 days in the above-mentioned repetition process, until shortened to 5 minutes and no longer changed;

[0025] ③When sludge in the form of particles with a diameter of about 0...

Embodiment 3

[0027] ①Put the activated sludge with a concentration of 4000mg / l inoculated in the existing sewage treatment plant into a cylindrical reactor (the diameter of the reactor is 5cm, and the height is 100cm), and the volume of the sludge is 50% of the working volume;

[0028] ②The reactor is fed with water for 5 minutes (the volume of the water is 50% of the total volume), after aeration (the aeration rate ensures that the dissolved oxygen in the water is 6-8mg / L, and the gas rising speed is 2.5cm / s), the initial static Sink for 10 minutes, discharge the upper half of the liquid after the precipitation in the reactor after the static settling (the volume of the drained liquid water accounts for 50% of the total volume); repeat the previous steps, and the static settling time shortens by 1 minute every 2 days in the above-mentioned repetition process, No change until shortened to 10 minutes;

[0029] ③When sludge in the form of particles with a diameter of about 1.0mm is observed ...

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Abstract

The invention discloses a method for immobilizing fungi during sewage treatment process, which comprises the steps of adding activated sludge into a reactor, performing cyclical operation according to the sequence of water intake, aeration, settling and drainage, adding table salt in the intake water when sludge particles of diameter about 0.2-1.0 mm are observed in the reactor, performing cyclical operation according to the sequence of water intake, aeration, settling and drainage, and gradually increasing salt concentration in the intake water during the cyclical process until large scale fungi propagation is observed. The inventive method realizes fungi self-immobilization with granular state by regulating fungi growth environment, so that the fungi become predominant flora during treatment process, thereby bringing good effect for decolorization and cellulose degradation of paper making wastewater and treatment of heavy metal wastewater.

Description

technical field [0001] The invention relates to a method for immobilizing fungi, in particular to a method for realizing the immobilization of fungi through the formation of granular sludge in the sewage treatment process. Background technique [0002] So far, the biological treatment technology of wastewater has been applied for more than 100 years. It is already an indisputable fact that bacteria are the quantitative and functional subject in traditional activated sludge and biofilm systems, but fungi are also their main components. Fungi have specific effects on the removal of pollutants in sewage, such as for decolorization and cellulose degradation of papermaking wastewater, have strong resistance to heavy metal toxicity and heavy metal adsorption capacity, and can be used for heavy metal wastewater treatment; the same fungus can also be used To synchronize nitrification and denitrification without the synergy of multiple species, it can efficiently remove nitrogen-con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李志华王晓昌
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY