Method for improving biofilm forming efficiency of packing in water treatment reactor

A technology of reactor and membrane efficiency, applied in chemical instruments and methods, special compound water treatment, biological water/sewage treatment, etc. The effect of reducing operating costs and low operating costs

Active Publication Date: 2018-11-27
NANJING JIANGDAO INST OF ENVIRONMENT RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can improve the efficiency of film hanging to a certain extent, they are difficult to be widely promoted in practice due to factors such as cost, safety and operational complexity.

Method used

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  • Method for improving biofilm forming efficiency of packing in water treatment reactor
  • Method for improving biofilm forming efficiency of packing in water treatment reactor
  • Method for improving biofilm forming efficiency of packing in water treatment reactor

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Embodiment 1

[0019] The reactor adopts a cylindrical structure, the diameter of the reaction zone is 5cm, the height is 100cm, and the volume of the reaction zone is 2L. The hydraulic retention time of the sequencing batch reactor is 4 hours, the volume exchange ratio of each cycle is 50%, and the composition of each cycle is: water inflow for 5 minutes, aeration for 111 minutes, standing for 2 minutes, and water outlet for 2 minutes. The organic load is 6g / (L·d), and the air flow rate is 2.4cm / s (the air flow rate in the reactor is controlled by aeration). The reactor inoculation sludge was collected from the aeration tank of the urban sewage treatment plant, and the initial sludge concentration of the reactor was 6000mg / L. Sodium acetate was used as an organic carbon source, and the COD concentration was 1000 mg / L. The reactor was operated at room temperature and the pH was maintained at 6.5-8.5. Add filler on the second day of reactor operation, the filling ratio of the filler is 20%,...

Embodiment 2

[0021] The reactor adopts a cylindrical structure, the diameter of the reaction zone is 5cm, the height is 100cm, and the volume of the reaction zone is 2L. The hydraulic retention time of the sequencing batch reactor is 4 hours, the volume exchange ratio of each cycle is 50%, and the composition of each cycle is: water inflow for 5 minutes, aeration for 111 minutes, standing for 2 minutes, and water outlet for 2 minutes. The organic load is 12g / (L·d), and the air velocity is 2.4cm / s. The reactor inoculation sludge was collected from the aeration tank of the urban sewage treatment plant, and the initial sludge concentration of the reactor was 6000mg / L. Sodium acetate is used as an organic carbon source, and the COD concentration is 2000mg / L. The reactor was operated at room temperature and the pH was maintained at 6.5-8.5. Filler was added on the second day of reactor operation, the filling ratio of filler was 20%, and the thickness of biofilm reached 2mm on the second day a...

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Abstract

The invention discloses a method for improving the biofilm forming efficiency of packing in a water treatment reactor. The method comprises the following implementation steps that activated sludge isinoculated in the reactor, the reactor is operated in a sequencing batch, the hydraulic retention time is 4 h, and according to each rotary group, water is fed for 5 min, aeration is performed for 108-111 min, standing settling is performed for 2-5 min, and water is drained for 2 min, wherein organic loads of water feeding are 6-12 g / (L d), and the air flow rate is 1.6-2.4 cm / s; when the reactor is operated at the second to fourth days, aerobic granular sludge containing a large number of film forming microorganisms is formed inside the reactor, and the packing is put into the reactor; 2-5 d after the packing enters the reactor, film forming is completed. Compared with other film forming methods, the film forming method has the advantages that no high-cost special microorganisms or substrate needs to be added, and the film forming cost is low; meanwhile, the operation cost is lowered, the film forming time of the packing is shortened to 2-5 d, and the film forming efficiency of a biofilm method is greatly improved.

Description

technical field [0001] The invention relates to a method for improving the film-hanging efficiency of fillers in water treatment reactors, belonging to the technical field of sewage treatment. Background technique [0002] Sewage biological treatment technology is mainly divided into activated sludge method and biofilm method. Compared with the activated sludge method, the biofilm method has many advantages, such as: high microbial diversity, rich biomass; less sludge output; strong impact resistance; easy management, low operating costs, etc. In view of the above advantages, the biofilm method has been widely used in the field of sewage treatment. The biofilm is formed by the attachment and growth of microorganisms on the surface of the filler. When the biofilm grows to a certain thickness, the mass transfer of oxygen is limited. The outer layer of the biofilm is in an aerobic state, while the inner layer is in an anaerobic state. From the outside to the inside, it is com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/12C02F3/1263C02F2305/06Y02W10/10
Inventor 叶林孙浩浩张徐祥任洪强黄开龙任仁
Owner NANJING JIANGDAO INST OF ENVIRONMENT RES CO LTD
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