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Method for strengthening sludge reduction of aerobic-sedimentation-anoxic process

A sludge reduction and process technology, applied in aerobic and anaerobic process treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of large power consumption and high cost, and achieve gas consumption less, low operating cost, and increased sludge reduction effect

Inactive Publication Date: 2010-06-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ozone needs to be prepared on site, consumes a lot of power, and has high cost. It has not been applied in China at present.

Method used

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  • Method for strengthening sludge reduction of aerobic-sedimentation-anoxic process
  • Method for strengthening sludge reduction of aerobic-sedimentation-anoxic process
  • Method for strengthening sludge reduction of aerobic-sedimentation-anoxic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, whether the aeration operation of the present invention is carried out in the anoxic tank in the traditional OSA process is tested, and the influence on sludge reduction is tested.

[0046] The sludge is taken from the anoxic stage sludge in the normal operation of the traditional OSA process at 50 tons / day, and is divided into 2 groups:

[0047] One group is without aeration control, as the control group;

[0048] Another group adopts the aeration control of the present invention as an experimental group.

[0049]Both groups were sealed in Erlenmeyer flasks. The experimental group was aerated for 30s every 1.5h, and the control group was left without any operation. Then the ORP value and suspended matter concentration (MLSS) of the two groups were measured to determine the amount of sludge reduction. Enhanced effect.

[0050] from image 3 It can be seen from the figure that the initial ORP values ​​of the two groups of sludge were both +50mV, and a...

Embodiment 2

[0052] In this embodiment, the change of dissolved oxygen (DO) in sludge with time before and after the application of the aeration control technology of the present invention is studied.

[0053] This example is divided into two groups,

[0054] One group is the traditional OSA process, that is, the anoxic tank does not undergo aeration treatment, as the control group;

[0055] The other group is to perform the aeration operation of the present invention on the anoxic tank in the traditional OSA process. As an experimental group, the experimental group performs aeration every 1.5 hours, and each aeration is about 30s. The experiment continued for about 22 hours.

[0056] Table 1 has provided in the control group and the experimental group, the DO of the sludge in the anoxic pond changes with time, as can be seen from Table 1, because each aeration time is shorter, so adopt the aeration control of the present invention It will not increase the concentration of dissolved oxyg...

Embodiment 3

[0060] This example is divided into two groups,

[0061] One group is the traditional OSA process, that is, the anoxic tank does not undergo aeration treatment, as the control group;

[0062] The other group is to perform the aeration operation of the present invention on the anoxic tank in the traditional OSA process, as an experimental group.

[0063] The initial conditions of this embodiment are: the mixed liquor suspended solids concentration (MLSS) of the sludge in the anoxic tank is about 12 g / L, and the mixed liquor volatile suspended solids concentration (MLVSS) is about 6 g / L.

[0064] Table 2 provides the comparison result of sludge reduction before and after the application of aeration control of the present invention, as can be seen from table 2, adopting aeration control to the anoxic tank has improved the self-decomposition rate of sludge, the concentration of MLSS and MLVSS The concentration of the sludge was lower than the results of anoxic sludge treatment in...

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Abstract

The invention discloses a method for strengthening sludge reduction of an aerobic-sedimentation-anoxic process. In the method, the aeration control of an anoxic pond is increased at the anoxic pond of the conventional OSA process, and aeration parameters such as bubbles, time, gas-liquid ratio, oxidation-reduction potential and the like are controlled, so that the sludge reduction effect of the conventional OSA is improved obviously. For the aeration control of the anoxic pond, aeration equipment of an aerobic biological treatment unit of the conventional process is adopted to perform simple pipeline extension, and the sludge reduction effect of the OSA is improved obviously by controlling the parameters without changing the cost of processing sludge. The aeration control technology can realize automated operation without personnel. The aeration control technology has the advantages of low air consumption, short aeration time, no power consumption, and utilization of air generated by the conventional aeration equipment, and thus the operating cost is close to zero.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to sludge reduction technology, in particular to a method for strengthening sludge reduction in aerobic-precipitation-anoxic process. Background technique [0002] The Oxic-Settling-Anoxic (OSA) process is to provide a specific environment for microorganisms by forming an anaerobic section in the sludge reflux in the conventional activated sludge process, so that the sludge internal Source respiration rate by 0.012d -1 Improve to 0.07d -1 , the bacteria can die quickly and decompose into a matrix, so as to achieve the effect of sludge reduction. The specific process flow is shown as figure 1 shown. [0003] In the traditional activated sludge process, the sludge production increases with the increase of the sludge load, but in the OSA process, the sludge production decreases with the increase of the sludge load, and the OSA process also improves the dewatering performanc...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F3/12
CPCY02W10/10
Inventor 刘广立李适宇陈光浩王军伍珂
Owner SUN YAT SEN UNIV
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