Method for remedying filamentous expanded aerobic granular sludge

An aerobic granular sludge and granular sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve problems such as swelling, filamentous bacteria growth, etc. The effect of smooth, regular shape, good settling properties

Inactive Publication Date: 2012-09-19
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods are mainly aimed at how to prevent the occurrence of filamentous expansion and enhance the stability of granular sludge during the formation of aerobic granular sludge. However, during the long-term operation of ae

Method used

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  • Method for remedying filamentous expanded aerobic granular sludge
  • Method for remedying filamentous expanded aerobic granular sludge
  • Method for remedying filamentous expanded aerobic granular sludge

Examples

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Embodiment 1

[0018] (1) Granular sludge to be repaired: the influent COD is 500mg / L, and the organic load is 1.5g COD / m 3 ·d, C:N:P=100:5:1 glucose artificial wastewater culture, the average particle diameter is 3mm, SVI is 70ml / g, biomass is about 6g SS / L. The presence of black filamentous bacteria on the surface of the particles can be observed with the naked eye, and the filamentous swelling of granular sludge such as figure 1 as shown in a.

[0019] (2) Bioreactor: The reactor is made of plexiglass, with a height of 80 cm, an inner diameter of 6 cm, and an effective volume of 2.4 L. The air enters the reactor through the microporous aeration head installed at the bottom of the reactor by the air pump, and the airflow formed provides the oxygen required for the growth of microorganisms and the shear force that is beneficial to the separation of filamentous bacteria on the surface of the particles. The aeration volume in the whole repair process is about 7L / min. The water outlet is lo...

Embodiment 2

[0023] (1) Granular sludge to be rehabilitated: use influent COD of 250-300mg / L, ammonia nitrogen of 12-15mg / L in a certain urban domestic sewage, with an organic load of 0.9g COD / m 3 Cultivate in a sequencing batch reactor around d, the average particle diameter is 1.5mm, the SVI is 60ml / g, and the biomass is about 4g SS / L (2g SS / L is used as a blank control). White filamentous bacteria can be observed on the surface of the particles with the naked eye.

[0024](2) Bioreactor: The reactor is made of plexiglass, 25cm high, 5cm internal diameter, and 0.5L effective volume. The air enters the reactor through the microporous aeration head placed at the bottom of the reactor by the air pump, and the airflow formed provides the oxygen required for microbial growth and the shear force that is beneficial to the separation of filamentous bacteria on the surface of the particles. The aeration volume during the entire repair process is about 4L / min. The reactor adopts sequential batch...

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Abstract

The invention discloses a method for remedying filamentous expanded aerobic granular sludge in the wastewater treatment process in the technical field of environmental protection and resource integration - water pollution prevention and control. The method adopts feeding and specific operation conditions to selectively enrich zoogloeae to remedy filamentous expanded aerobic granular sludge. The method comprises the steps of: firstly providing culture conditions which facilitate the growth of zoogloeae in the granular sludge, i.e. improving inlet water concentration of an aerobic granular sludge reactor through feeding, so as to regulate inlet water chemical oxygen demand (COD) to 1000-1500mg/L and carbon to nitrogen ratio (C:N) to 6.7-10; then setting a sequencing batch mode with a certain operation cycle to guarantee sludge load to reach 1.0-1.5g COD/g SS.d; and finally using shearing force provided by high aeration intensity (4-7L/min) to strengthen the falling of filamentous bacteria on the surface of the granular sludge and draining the falling suspended filamentous bacteria out of the reactor at a water drainage stage. By adopting the method, the sludge volume index (SVI) of the filamentous expanded granular sludge can be decreased to 20-40ml/g from a value above 50ml/g, and the stable structure, the settling property and the wastewater treatment capacity of the granular sludge can be restored.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource integration-water pollution prevention and control, and relates to a method for solving the filamentous expansion of aerobic granular sludge in a new wastewater treatment technology. Specifically, it relates to a method for repairing aerobic granular sludge that has undergone filamentous expansion by using supplementary materials and a strategy of selectively enriching micellar bacteria under specific operating conditions. The method is widely applicable to the aerobic granular sludge process for treating various forms of domestic sewage discharged from cities or rural areas and other easily biodegradable organic wastewater. Background technique [0002] Biological treatment is the main technical means of water pollution control. The traditional activated sludge treatment system generally occupies a large area, the construction cost is high, the amount of residual sl...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李安婕李晓岩杨志峰全向春
Owner BEIJING NORMAL UNIVERSITY
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