Method and device for reduction treatment of residual sludge

A technology for excess sludge and treatment methods, applied in sludge treatment, biological sludge treatment, etc., can solve the problems of increasing the burden of nitrogen and phosphorus pollutants in the process system, affecting the activity of system sludge, and large volume of anaerobic reaction tanks. To achieve the effect of consolidating the effect of sewage treatment, low construction cost and long-term economic benefits

Active Publication Date: 2012-10-10
SUN YAT SEN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the current OSA process itself still has certain defects.
Since the OSA process is equivalent to inserting an anaerobic reaction tank in the aerobic sludge return section of the traditional activated sludge method, the sludge discharged from the sedimentation tank is treated in an anaerobic tank and then returned to the aeration tank, which substantially changes The living environment of microorganisms is changed, and the microbial population structure and sludge properties in the original aerobic activated sludge are also changed to a certain extent. This not only brings sludge reduction effect to the system, but also affects the system sludge Activity will bring adverse results to sewage treatment, such as the reduction of sludge yield, resulting i

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  • Method and device for reduction treatment of residual sludge
  • Method and device for reduction treatment of residual sludge
  • Method and device for reduction treatment of residual sludge

Examples

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Embodiment 1

[0031] Example 1 Excess sludge reduction treatment device and method for reducing excess sludge by using the device

[0032] Such as figure 1 As shown, a residual sludge reduction treatment device is composed of an aerobic biochemical reaction tank 2, a sedimentation tank 4 and an anaerobic reaction tank 7, wherein the outlet of the aerobic biochemical reaction tank 2 is connected to the entrance of the sedimentation tank 4, and the sedimentation tank The outlet of 4 is connected with the inlet of anaerobic reaction tank 7, and the outlet of anaerobic reaction tank 7 is connected with the inlet of aerobic biochemical reaction tank 2.

[0033] A method for reducing the amount of excess sludge of the present invention comprises the following steps:

[0034] (1) After the sewage 1 enters the aerobic biochemical reaction tank 2 for sufficient aeration and mixing, the outflow sludge mixture 3 of the aerobic biochemical reaction tank 2 is introduced into the sedimentation tank 4 fo...

Embodiment 2

[0037] Example 2 Effect Research of the Excess Sludge Reduction Treatment Method in Example 1

[0038] This embodiment further illustrates the effect of the method of the present invention through comparative experiments.

[0039] The excess sludge reduction treatment method of the present invention is based on the SBR-OSA (sequential batch activated sludge process-aerobic-sedimentation-anaerobic) process, without adding any devices, by returning to the anaerobic reaction tank 7. Settling the supernatant, returning to the anaerobic reaction tank every three days. 7. The operation mode of mixed sludge replaces the traditional operation mode of returning mixed sludge, forming a new SBR-OSA process, in order to pass the return of the static settling supernatant Liquid reduces the impact of reflux on the aerobic biochemical reaction tank 2, and improves the sewage treatment performance of the system; at the same time, it is also hoped that this improved operation mode will further s...

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Abstract

The invention discloses a method and a method for reduction treatment of residual sludge. After entering an aerobic biochemical reaction basin for aeration and mixing, a mixture of sludge and sewage is led to a settlement basin for settling, and supernate is extracted; the sludge in the settlement basin is periodically drawn into an anaerobic reaction basin for reacting and static settling; equivalent statically-settled supernate in the anaerobic reaction basin is drawn out to flow back to the aerobic biochemical reaction basin; and equivalent sludge in the anaerobic reaction basin is drawn out every three days to flow back to the aerobic biochemical reaction basin, so as to accomplish circulated exchange and flow of the sludge among settlement equipment, anaerobic equipment, aerobic equipment and the settlement equipment. The method of statically settling the supernate in the backflow anaerobic reaction basin is adopted, the concentration of the sludge in the anaerobic reaction basin is increased, the sludge reduction effect is good and stable, and the denitrogenation ability of a process system is improved; in addition, as the concentration of the sludge in the anaerobic reaction basin is increased, and the volume of the anaerobic reaction basin is reduced, constructing and transforming are easy, no reaction devices and equipments are required to be added, the construction cost is low, and the method and the device have a long-term economic benefit.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method and device for waste sludge reduction treatment. Background technique [0002] Municipal sludge is a by-product produced in the process of urban sewage treatment. As far as the nature of municipal sludge in my country is concerned, the content of organic matter in sludge exceeds 50%, and contains a large amount of nutrients such as N and P (N content of which is 1.5% to 7.0 %, P content 0.8% to 3%). According to the figures provided by the State Environmental Protection Administration of China, China currently discharges about 40.1 billion m of sewage every year. 3 , there are more than 400 urban sewage treatment plants that have been built and operated, with a daily treatment capacity of 25.34 million m 3 . Based on the calculation that the sludge output accounts for 0.3% to 0.5% of the treated water (calculated with a water content of 97%), the sludge output of China'...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 孙连鹏余小玉王腾蛟罗旺兴伍世嘉
Owner SUN YAT SEN UNIV
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