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Process for realizing decrement of active sludge and removal of endocrine disrupting chemicals from sludge synergistically

An endocrine disruptor, activated sludge technology, applied in water/sludge/sewage treatment, oxidation treatment of sludge, biological sludge treatment, etc. Water ecology and human health threats, to reduce the load of organic micro-pollutants, enhance the effect of sludge reduction, and facilitate continuous automatic operation.

Inactive Publication Date: 2011-08-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the ozone reduction process of activated sludge, a large number of toxic and harmful organic micro-pollutants adsorbed in the sludge may not be fully degraded, and then released into the water phase with the disintegration of the sludge, increasing the cost of the sewage treatment system. load, leading to an increase in the concentration of organic micro-pollutants in the system effluent, posing a threat to water ecology and human health

Method used

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  • Process for realizing decrement of active sludge and removal of endocrine disrupting chemicals from sludge synergistically
  • Process for realizing decrement of active sludge and removal of endocrine disrupting chemicals from sludge synergistically
  • Process for realizing decrement of active sludge and removal of endocrine disrupting chemicals from sludge synergistically

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] We collected activated sludge from the secondary sedimentation tank of the sewage treatment plant. Due to the low concentration of endocrine disruptors E1, EE2, E3 and BPA in the sludge, we spiked the sludge. The concentrations of the interfering substances are shown in Table 1. The dosage of ozone is controlled at 30mg / g SS, and the ozonation time is 10 minutes. h 2 o 2 Batch addition is adopted, that is, one-time dosing at the beginning of ozonation, H 2 o 2 The dosage molar ratio with ozone is 1:1. The removal effects of each endocrine disruptor are shown in Table 1. Compared with individual ozonation, the removal rate of each endocrine disruptor has been significantly improved. In addition, in the single ozonation process, the concentration of phenolic endocrine disruptors in the sludge liquid phase will increase, because a large amount of these substances will dissolve into the liquid phase with the dissolution of the sludge. However, in the process of the pr...

Embodiment 2

[0020] Endocrine disruptors in activated sludge were spiked at the same concentrations as in the previous example. The dosage of ozone is controlled at 30mg / g SS, and the ozonation time is 10 minutes. In order to compare H 2 o 2 The possible impact of the dosing method, in this case H 2 o 2 Continuous dosing mode is adopted, that is, continuous dosing during the whole ozonation process, H 2 o 2 The dosage molar ratio with ozone is still maintained at 1:1. The removal effect of each endocrine disruptor is shown in Table 2. It can be seen that with different H 2 o 2 Dosing mode had little effect on the removal of endocrine disruptors. Overall, the continuous dosing mode is more conducive to the removal of refractory phenolic endocrine disruptors.

[0021] Table 2 The total removal effect of endocrine disruptors in sludge (solid phase and liquid phase)

[0022]

Embodiment 3

[0024] Endocrine disruptors in activated sludge were spiked at the same concentrations as in the previous example. The dosage of ozone is controlled at 30mg / g SS, and the ozonation time is 10 minutes. Increase H in this example 2 o 2 Dosage of H 2 o 2 The molar ratio of the amount of ozone and ozone increased to 1.5:1, H 2 o 2 Adopt batch feeding mode. The removal effect of each endocrine disruptor is shown in Table 3. The results showed that increasing the H 2 o 2 After adding the dosage, the sludge dissolution efficiency has been significantly improved, and the dissolution rate has reached 16%. In addition, with 1:1 H 2 o 2 / O 3 Compared with the dosage molar ratio, the removal of various endocrine disruptors is also greatly improved, and their removal rate increases by 6% to 13%.

[0025] Table 3 The total removal effect of each endocrine disruptor in sludge (solid phase and liquid phase)

[0026]

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Abstract

The invention relates to a process for realizing the decrement of active sludge and the removal of endocrine disrupting chemicals from sludge synergistically in a municipal sewage treatment plant, and belongs to the technical field of environmental protection and waste water treatment. The active sludge is oxidized under the combined action of ozone and H2O2 to be decomposed, and organic a large number of micropollutants (such as the endocrine disrupting chemicals) adsorbed in the sludge are removed simultaneously, so that the concentration of the micropollutants in the active sludge is reduced effectively, wherein for the addition dosage of the ozone, more than or equal to 30 milligrams of ozone is added into each gram of dried sludge, the H2O2 can be added in batch or continuously, and a molar dosage ratio of the ozone to the H2O2 is 1:1.5. In the process, a simple system structure is simple, continuous automatic running can be realized, and large-scale industrial application is easy realized.

Description

technical field [0001] The invention relates to a process for reducing the amount of activated sludge in an urban sewage treatment plant and synergistically removing endocrine disruptors in the sludge, and belongs to the technical field of environmental protection wastewater treatment. Background technique [0002] Activated sludge method is the most widely used and mature technology in sewage treatment technology. At present, about 90% of sewage treatment plants in the world use activated sludge method as the core treatment technology. However, an important technical bottleneck in the activated sludge process is the large amount of excess sludge that needs to be treated. At present, the disposal methods of surplus sludge mainly include landfill, soil improvement and incineration. Since surplus sludge may contain a large amount of heavy metals, pathogenic microorganisms and toxic and harmful organic pollutants, the application of soil improvement has been banned in some coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/06C02F3/12
CPCY02W10/10
Inventor 强志民聂亚峰张鹤清
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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