Method for hanging membrane in sludge internal circulation biological filter

A technology of biofilter and film-hanging method, which is applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., and can solve the problems of sludge deposition and uneven distribution of biofilm

Inactive Publication Date: 2009-11-18
SHANDONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method of adding internal circulation to improve the efficiency of biofilter film formation in view of technical problems such as sludge deposition and biofilm distribution in the process of biofilter stuffy exposure and film formation.

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  • Method for hanging membrane in sludge internal circulation biological filter

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Embodiment Construction

[0018] The test volume is 4.55m 3 The pilot-scale upflow biological aerated filter treats the secondary effluent of urban sewage. Experimental device such as figure 1 As shown, the diameter of the filter column is 1.0m, the height is 6.5m, the filler is ceramsite, the filling height is 4.0m, and there is a 30cm pebble supporting layer underneath. A water outlet pipe is set at a height of 40 cm from the top of the packing layer, and the pipe is connected with a booster pump. The outlet pipeline of the booster pump is divided into 3 branches leading to different filter material height levels respectively, and the water distribution pipes 21, 22, 23 are respectively 1.0, 2.2 and 3.5m away from the top of the packing layer (from top to bottom). Flowmeters and ball valves are installed on the three branch pipes, the reaction temperature is 16.7-26.5°C, and the pH value of the wastewater is 7.0±0.1.

[0019] The activated sludge is taken from the aeration tank of the urban sewage...

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Abstract

The invention provides a method for hanging a membrane in a sludge internal circulation biological filter. The method comprises the following steps: mixing acclimated sludge and wastewater, adding nutrition, and injecting into the biological filter for aeration; at the same time, stepwise starting internal circulation from bottom to top along the height direction of the filter, and making microorganisms fully contacted with a filter material and attached to the filter material for growth; after a period of culture, discharging mixed liquor, adding high concentration wastewater to continue aeration culture, and exciting the activity of the attached microorganisms; and after a membrane is formed, discharging the high concentration wastewater, continuously introducing water, and making the hydraulic load from low to high until forming a stable biological membrane. The method utilizes current disturbance action formed by the internal circulation of the sludge and water mixed liquor in the biological filter to overcome sludge deposition, strengthens the adhesive ability of the microorganisms on the surface of the filter material, improves local membrane hanging effect, and improves the whole membrane hanging efficiency of the filter and the shock load resistance of the biological membrane.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental engineering water treatment and is applicable to various biofilter water treatment processes. 2. Background technology [0002] Film formation is a key link in the rapid start-up of the biofilm treatment process, and efficient film formation can greatly shorten the start-up period of the process. At present, the literature reports on the research on biofilm-hanging methods in biofilters mainly include "closed circulation method" and "suffocating exposure method". In 2003, Volume 21, No. 2, "Environmental Engineering" published a paper "A New Method for Bioaerated Filter Reactor" to point out that the closed cycle method generally takes 2-3 weeks to complete. It takes a long time and needs to set up a circulating pool, which is inconvenient to operate. The stuffy exposure method can shorten the film-hanging time to 3-4 days, and the biofilm is firmly attached and is not easily damaged by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/10C02F3/34
CPCY02W10/10
Inventor 裴海燕胡文容蒋波刘倩辉
Owner SHANDONG UNIV
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