Method and device for treating wastewater and producing nutrients

A technology for treating waste water and nutrients, which is applied in the field of waste water recycling, and can solve problems such as large power consumption, short service life, and low luminous efficiency of incandescent lamps

Active Publication Date: 2021-05-28
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the incandescent light source cannot maintain long-term stability and decays quickly, and the luminous efficiency of the incandescent lamp is low, the service life is short, and the power consumption is large

Method used

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  • Method and device for treating wastewater and producing nutrients
  • Method and device for treating wastewater and producing nutrients
  • Method and device for treating wastewater and producing nutrients

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see figure 1 , a device for treating wastewater using graphene quantum dots, comprising a photosynthetic bacteria photobioreactor 13, a quartz tube 14, a silica gel tube 22, and an ultraviolet lamp 18;

[0048] The photosynthetic bacteria photobioreactor 13 is a cuboid container made of plexiglass, and the quartz tube 14 is vertically arranged in the photosynthetic bacteria photobioreactor 13 center, and the lower end of the quartz tube is the inlet of the graphene quantum dot solution, and the upper end is the graphene quantum dot solution. The outlet of the dot solution, the inlet and the outlet are connected to the silica gel tube 22 to form a circulation loop of the graphene quantum dot solution; the circulation loop is provided with a peristaltic pump 17, a liquid flow meter 19, a flow control valve 20 and a circulation fluid buffer chamber 21;

[0049] An ultraviolet lamp 18 is placed at the section where the silicone tube connects to the inlet; a shading cloth 16...

Embodiment 2

[0053] Embodiment 2 Comparison test of different light conditions

[0054] 1) Adjust the concentration of wastewater so that COD is 6500mg / L; add nitrogen and phosphorus sources to adjust the carbon-nitrogen-phosphorus ratio in wastewater to 200:5:1 (according to the optimal carbon-nitrogen ratio of traditional wastewater biological treatment method as a basis );

[0055] 2) Inoculate Rhodopseudomonas palustris (single species) in the logarithmic growth phase with an inoculation amount of 200-500mg / L dry weight in the wastewater, and adjust the pH value to 6.8-7.0;

[0056] 3) Use ultraviolet rays with a wavelength of 365nm as excitation light to continuously irradiate the graphene quantum dot solution, so that the graphene quantum dots in it absorb energy, and the electrons transition from a high energy level back to the ground state and emit fluorescence with a wavelength of 550-620nm as a light source for the growth of photosynthetic bacteria ; The wastewater inoculated wi...

Embodiment 3

[0060] Embodiment 3 quantum dot concentration optimization test

[0061] Based on the results of Example 2, quantum dots were used as light sources, and different quantum dot concentrations were set, and other operations were the same as in Example 2. image 3 Experimental results are processed for different quantum dot concentrations (abscissa is quantum dot concentration).

[0062] The biomass of 1860.5mg / L and the COD removal rate of 70.3% were obtained in the group whose quantum dot concentration was 8mg / L. In addition, the production of carotenoids increased by 27.6% and 53.9% compared with the other two groups; the production of bacteriochlorophyll increased by 28.3% and 46.6%.

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Abstract

The present invention provides a method and equipment for treating waste water and producing nutrients, said method comprising the steps of: 1) adjusting the concentration of waste water to wherein COD is 6000-8000 mg / L; adding nitrogen source and phosphorus source to adjust carbon in waste water Nitrogen-phosphorus ratio; 2) inoculating photosynthetic bacteria in the logarithmic growth phase in the wastewater; 3) continuously irradiating the graphene quantum dot solution with a wavelength of 365nm ultraviolet rays for the excitation light, and irradiating the wastewater with the flowing graphene quantum dot solution; 4 ) When the growth of photosynthetic bacteria reaches the plateau stage, the filter membrane is used to separate bacteria from water. The present invention proposes a sewage resource utilization method for the production of high-value photosynthetic bacteria, which is a wastewater treatment and resource utilization method that combines the treatment of beer wastewater with the output of high-value nutrients, which can realize the removal of pollutants in wastewater In addition, the generated biomass can extract high-value nutrients, which has multiple functions of environmental protection, cost saving, and resource recovery.

Description

technical field [0001] The invention belongs to the technical field of waste water recycling, and in particular relates to a method and equipment for treating waste water by using quantum dots. Background technique [0002] Most of the wastewater discharged from the food industry is high-concentration organic and non-toxic wastewater, but it is easy to corrupt and cause harm to the water environment. At present, SBR, CASS, UASB and other processes are commonly used for treatment. The process is long, and a large amount of excess sludge is generated, and the beneficial substances in it cannot be effectively recycled. The use of photosynthetic bacteria to treat beer wastewater can effectively treat pollutants, and can convert useful substances into bacteria and recover high-value nutrients. Photosynthetic bacteria is a widely distributed microorganism that integrates all metabolic methods in the world (including photoautotrophy, photoheterotrophy, chemoautotrophy, chemohetero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P23/00C12P1/04C02F3/34C12M1/00C12M1/02C12R1/01
CPCC02F1/30C02F3/348C02F2101/30C02F2103/32C12M21/02C12M27/02C12M29/18C12P1/04C12P23/00
Inventor 卢海凤徐虹韩挺李保明张源辉胡顺帆
Owner CHINA AGRI UNIV
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