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Method for denitrogenation and phosphorus-removal of town sewage through efficient immobilized algae bacterial symbiosis system

A technology for the symbiosis of urban sewage and algae and bacteria, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Dissolution and other problems, to achieve the effect of good engineering application prospects, easy implementation, and improved removal efficiency

Active Publication Date: 2015-02-25
XIANGTAN UNIV
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to provide a sewage biological denitrification and phosphorus removal method that is easy to be applied in engineering, in order to solve the problems of complex immobilization process of algal bacteria, easy dissolution of carrier, high treatment cost and engineering problems in the process of treating urban sewage with immobilized algal bacteria It provides technical support for the energy saving and emission reduction of urban sewage treatment

Method used

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  • Method for denitrogenation and phosphorus-removal of town sewage through efficient immobilized algae bacterial symbiosis system
  • Method for denitrogenation and phosphorus-removal of town sewage through efficient immobilized algae bacterial symbiosis system
  • Method for denitrogenation and phosphorus-removal of town sewage through efficient immobilized algae bacterial symbiosis system

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Experimental program
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Effect test

Embodiment 1

[0025] Water samples were taken from the secondary sedimentation tank of a sewage treatment plant, and the biological communities in the sewage were analyzed according to the polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) molecular biology method. The results showed that there were dominant algae in the sewage : Filamentous algae of the genus Coleopsis—Oedogonium brevicingulatum and Chlamydomonas asymmetrica.

[0026] Evaluation of the immobilization effect of the two kinds of algae: Take 4 2L beakers, fill each beaker with elastic three-dimensional filler, the volume filling rate of the filler is 60%, add 0.5g dry weight of breveenella to two of the beakers respectively , add 0.5g of Chlamydomonas asymmetrical dry mass in the other two beakers, add 1.5L tap water to each beaker, place the beaker in a shaker, control the water flow rate to 30-60cm / s, light intensity 4000lx, light and dark The time ratio is 12h:12h. After 24 hours, take out 1000ml ...

Embodiment 2

[0034] In this embodiment, the identification of dominant algae in the sewage, the screening of algal sources, the determination of the dry weight of algae and the setting of the experimental group are all the same as in Example 1. Each beaker is added with simulated sewage water quality NH 4 -N: 12±0.5mg / L, TP: 2±0.2mg / L, COD Cr : 250±5mg / L, pH: 7.44, water temperature: 25±5℃. After 3 days of treatment, the range of dry weight of algae: dry weight of bacteria in the experimental group was 1:5-5:1, and the NH in the treated simulated sewage 4 -N, TP, COD Cr , pH, and SS all meet the first-level A standard of the urban sewage treatment plant pollutant discharge standard (GB18918-2002).

[0035] The data comparison of the initial content of each substance in the above-mentioned embodiment, the water quality after the treatment of each experimental group and the pollutant discharge standard (GB18918-2002) of urban sewage treatment plants (GB18918-2002) is as follows:

[0036] ...

Embodiment 3

[0040] In this embodiment, the identification of dominant algae in the sewage, the screening of algae sources and the determination of the dry weight of algae are the same as in Example 1. The initial total biomass is controlled to 0.3g / L, and the dry weight of algae: the dry weight of bacteria is 1:5. , 1:1, 5:1 set up the experimental group, the volume filling rate of the elastic three-dimensional filler is 50% to 80%, the light intensity is controlled to 4000-6000lx, the light-to-dark time ratio is 12h:12h, and the influent of a sewage treatment plant is used as the experimental object , the whole process is magnetically stirred, and the rotor speed is controlled at the bottom of the beaker without algae and bacteria precipitation. After 2d treatment, NH in the experimental water 4 -N, TN, TP, COD Cr , pH, and SS all meet the first-level A standard of the urban sewage treatment plant pollutant discharge standard (GB18918-2002).

[0041] The data comparison of the waste wa...

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Abstract

The present invention discloses an efficient town sewage denitrogenation and phosphorus-removal biological treatment method, and belongs to the technical field of sewage treatment. According to the method, the dominant algae variety identified from the municipal wastewater treatment plant is selected as the algae source, active sludge is adopted as the bacterial source, an elastic three-dimensional filler is adopted as the immobilized filler, and the sewage is treated according to an algae bacterial dry weight mass ratio of 1:5-5:1, an illumination intensity of 4000-6000 lx, and a hydraulic detention time of 2-3 d. According to the present invention, the algae and bacteria immobilization way is simple, the town sewage treatment effect is good, the indexes of ammonia nitrogen (NH4-N), total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (CODCr) and suspended solids (SS) in the treated town sewage achieve the first grade A standard of the municipal wastewater treatment plant pollutant discharge standard (GB18918-2002). .

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a highly efficient biological treatment method for denitrification and phosphorus removal of urban sewage. Background technique [0002] With the increasingly serious problems such as water eutrophication, sewage discharge and treatment have received extensive attention. During the 12th Five-Year Plan period, my country raised the discharge standard of urban sewage water quality, that is, the pollutant discharge standard for urban sewage treatment plants (GB18918-2002) was upgraded from Class B to Class A. The total nitrogen discharge standard is reduced from 20mg / L to 15mg / L, the ammonia nitrogen discharge standard is reduced from 8mg / L in summer to 5mg / L, and the winter 15mg / L is reduced to 8mg / L, and the total phosphorus discharge standard is reduced from 1mg / L to 0.5mg / L. [0003] Biological nitrogen and phosphorus removal technology has been widely used due to its a...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/32
CPCC02F3/325C02F3/34C02F2301/00
Inventor 葛飞曾小双苏肖玲唐斐陈彪刘娜许银
Owner XIANGTAN UNIV
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