Method for resource utilization of wastewater by utilizing graphene quantum dots

A technology of graphene quantum dots and recycling, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., to enhance flexibility, improve photosynthesis efficiency, and realize treatment and recycling The effect of using

Active Publication Date: 2019-08-16
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its application in the field of microbial technology still needs further development.

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  • Method for resource utilization of wastewater by utilizing graphene quantum dots
  • Method for resource utilization of wastewater by utilizing graphene quantum dots
  • Method for resource utilization of wastewater by utilizing graphene quantum dots

Examples

Experimental program
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Embodiment 1

[0037] 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;

[0038] 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 with a 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 circulating liquid flow meter 19, a pressure gauge, a flow control valve 20 and a circulating fluid buffer room 21;

[0039] An ultraviolet lamp 18 is placed at the section where the silicone tube connects to t...

Embodiment 2

[0043] Embodiment 2 photosynthetic bacteria optimization test

[0044] 1) Using the equipment of Example 1, pump 1L of organic waste water into the reactor body from the waste water inlet 12 through the water pump, add 9L of distilled water, NH 4 Cl 14.6g, KH 2 PO 4 3.7g, the final COD was 8407.2mg / L, the TN was 420.3mg / L, and the TP was 84.1mg / L;

[0045] 2) Three groups of photosynthetic bacteria test: add a single strain (Rhodobacterium sphaeroides), mixed bacteria solution 1 (Rhodobacterium capsulata, Rhodobacter colloidus, Crimson red snail, Rhodobacter sphaeroides) to the treated wastewater Bacteria, Rhodopseudomonas palustris mixed in equal volume), mixed bacteria liquid 2 (capsulated rhodobacter, colloidal rhododendron, crimson red snail, rhodobacter sphaeroides, rhodopseudomonas palustris five kinds The volume ratio is 1:2:2:3:4).

[0046] Mix until the dry weight of photosynthetic bacteria is 0.35g / L, the total liquid volume is two-thirds of the volume of the ma...

Embodiment 3

[0050] Example 3 Wastewater carbon-nitrogen ratio optimization test

[0051] Based on the results of Example 2, the volume ratio of five kinds of rhodobacter capsularis, rhododendron colloidus, crimson red snail, rhodobacter sphaeroides and rhodopseudomonas palustris is 1:2:2:3:4 photosynthetic bacteria. Different carbon-nitrogen ratios are set, and other operations are the same as in Example 2.

[0052] see image 3 , the wastewater C / N / P ratio is 20:5:1, 100:5:1 and 500:5:1, the biomass after 60 hours of treatment is 2714.7, 3420.4, 2493.9mg / L, and the COD removal rate is respectively 71.9%, 82.9%, 63.9%. Comprehensive biomass and pollutant removal effect, choose the appropriate C / N / P as 100-200:5:1.

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Abstract

The invention provides a method for resource utilization of wastewater by utilizing graphene quantum dots. The method comprises: 1) adding a nitrogen source and a phosphorus source to wastewater, andadjusting a carbon-nitrogen-phosphorus ratio in the wastewater; 2) inoculating photosynthetic bacteria in a logarithmic growth phase in the wastewater according to an inoculating amount of 200-500 mg / L dry heavy; 3) continuously irradiating a graphene quantum dot solution by using ultraviolet light as excitation light, and irradiating the wastewater inoculated with the photosynthetic bacteria by using the flowing graphene quantum dot solution; and 4) after the growth of the photosynthetic bacteria reaches a plateau phase, carrying out bacterial-water separation by using a filtering membrane. According to the present invention, with the wastewater resource treatment method, the traditional incandescent lamp is replaced with the fluorescence in the solution, such that the economic cost is saved while the light energy utilization rate of the photosynthetic bacteria is increased, and the adjustment of the illuminance of the emitted light can be achieved by changing the solution concentration so as to improve the biomass accumulation and enhance the flexibility of the operation.

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] According to statistics, the discharge of organic wastewater in my country has reached 300 million m 3 At present, SBR, CASS, UASB and other processes are commonly used for treatment. The process is long, resulting in a large amount of excess sludge, and the beneficial substances in it cannot be effectively recycled. Photosynthetic bacteria treatment can effectively treat pollutants in organic wastewater, and can convert useful substances in them into bacteria, recover high-value nutrients, and is an effective way to recycle organic wastewater. Photosynthetic bacteria is a widely distributed microorganism that integrates all metabolic methods in the world (including photoautotrophy, photoheterotrophy, chemoautotrophy, chemoheterotrophy); its growth rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34
CPCC02F3/34C02F2203/004C02F2203/006
Inventor 卢海凤徐虹何仕超韩挺张源辉李保明王常洁
Owner CHINA AGRI UNIV
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