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Preparation method for biological membrane

A biofilm and sewage technology, applied in the field of water treatment, can solve the problems of long film-hanging period and easy shedding of biofilm, and achieve the effect of increasing growth rate, not easy to shed, and improving treatment effect

Active Publication Date: 2017-04-26
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of sewage treatment using the biofilm method in the prior art, the inventors found that since the formation process of biofilm relies on the natural growth of fungi, the film-hanging cycle generally required is about 20-40 days, and such a film-hanging cycle is relatively short. Long, naturally growing biofilms are prone to shedding

Method used

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preparation example Construction

[0025] The invention provides a method for preparing a biofilm, the method comprising the steps of:

[0026] Step 1: Add activated sludge and silk algae to sewage;

[0027] Step 2: Control the environment of the sewage to meet the film-forming conditions, and form a symbiotic film of algae and bacteria in the sewage. The film-forming conditions include: the temperature of the sewage is 15-35°C, the PH value of the sewage is 6-9, and the DO of the sewage (Dissolved oxygen) is 2-8mg / L.

[0028] The above steps 1 and 2 are just for the convenience of description, and do not limit the order of execution for the first time. For example, before adding activated sludge and silk algae to the sewage, the environment of the sewage can be controlled first. Satisfy the film-hanging conditions, and then add activated sludge and filamentous algae to form algae-bacteria symbiotic film; it can also be carried out in the order described in the above steps 1 and 2.

[0029] In order to accele...

Embodiment 1

[0041]Take the sewage of a certain sewage treatment plant that has been treated by grids and grit chambers as the sewage to be treated, and carry out sewage treatment according to the method provided by the embodiment of the present invention, put in activated sludge and silk algae, and cultivate the symbiotic film of algae and bacteria before draining Treatment, the characteristics of the water quality before the sewage treatment in this experiment are: chemical oxygen demand (Chemical oxigen demand, COD for short) 240-380mg / L, total nitrogen 25-40mg / L, total phosphorus 4-8mg / L, using this In the biofilm preparation method provided by the invention, the dry weight of the activated sludge containing active bacteria dropped in is 2.5-3.5g / L, and the silk algae uses a certain silk algae of the genus Tribonema in the microalgae according to the dry weight of 0.1-3.5g / L. The ratio of 0.15g / L, the amount of sunlight is maintained at 22-26MJ / ㎡·d, the air-water ratio of aeration durin...

Embodiment 2

[0043] The pretreated anaerobic effluent of a livestock and poultry wastewater treatment facility is used as the sewage to be treated, and the sewage is treated according to the method provided by the embodiment of the present invention, and the activated sludge and silk algae are put into it, and the symbiotic film of algae and bacteria is cultivated, and then drained Treatment, the characteristics of water quality before sewage treatment in this experiment are: COD 450-650mg / L, total nitrogen 10-30mg / L, total phosphorus 1.5-10mg / L, using the biofilm preparation method provided by the invention, input containing The dry weight of the activated sludge of the active bacteria is 4.0-6.0g / L, using a certain algae of the genus Tribonema in the microalgae according to the dry weight of 0.2-0.5g / L, and the amount of sunlight is 22- 26MJ / ㎡·d, the air-water ratio of aeration during the day is 15:1-12:1, the air-water ratio of aeration at night is 20:1-25:1, the design hydraulic retenti...

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Abstract

The invention discloses a preparation method for a biological membrane, relates to the technical field of water treatment and solves the problem of low efficiency of wastewater treatment. The preparation method for the biological membrane comprises the following steps: adding active sludge and ulothrix into wastewater; and controlling the environment of the wastewater to meet conditions of membrane formation so as to form an algae-bacteria symbiotic membrane in the wastewater, wherein the conditions of membrane formation are as follows: the temperature of the wastewater is 15 to 35 DEG C; the pH value of the wastewater is 6 to 9; and the DO of the wastewater is 2 to 8 mg / L. The preparation method provided by the invention can extremely improve membrane formation efficiency, and can rapidly form a zoogloea-adhered algae-bacteria symbiotic biological membrane with ulothrix as a skeleton.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a biofilm preparation method. Background technique [0002] With the continuous development of industry, water pollution continues to affect the living environment of human beings. In order to improve the living environment of human beings, it is necessary to treat various sewage. The commonly used sewage treatment technology in the prior art is the biofilm method, which uses microorganisms (ie, biofilm) attached to the surface of some solid objects to treat organic sewage. Biofilm is an ecosystem composed of highly dense aerobic bacteria, anaerobic bacteria, facultative bacteria, fungi, protozoa and algae, and the solid medium attached to it is called filter material or carrier. The biofilm first adsorbs the organic matter attached to the water layer, decomposes it by the aerobic bacteria in the aerobic layer, and then enters the anaerobic layer for anaerobic decomposit...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/12C02F3/34
CPCC02F3/1268C02F3/325C02F3/34Y02W10/10Y02W10/37
Inventor 李威程小雪徐凯张同董鹏
Owner ENN SCI & TECH DEV
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