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A system and method for treating coal gasification wastewater using microalgae

A technology for coal gasification wastewater and treatment methods, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve energy consumption, high operating costs, long process flow, upstream phenol ammonia Problems such as the impact of recycling process, to achieve the effect of resource utilization and cost reduction

Inactive Publication Date: 2015-09-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochemical method is widely used, but it is significantly affected by the upstream phenol ammonia recovery process, the operation fluctuates greatly, the overall process is long, and it is difficult to meet the emission standards
The advanced treatment process mainly uses physical and chemical methods, advanced oxidation methods and other processes, which have problems such as high energy consumption and high operating costs

Method used

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  • A system and method for treating coal gasification wastewater using microalgae
  • A system and method for treating coal gasification wastewater using microalgae
  • A system and method for treating coal gasification wastewater using microalgae

Examples

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Effect test

Embodiment 1

[0051] This embodiment is used to illustrate the system and method for treating coal gasification wastewater using microalgae provided by the present invention.

[0052] Such as figure 1 As shown, the system for treating coal gasification wastewater using microalgae provided by the present invention includes a microalgae cultivation device 1, a microalgae conveying device 2 and a coal gasification wastewater treatment device 3 provided with an inlet and an outlet. One end is connected to the outlet of the microalgae cultivation device 1, the outlet of the microalgae cultivation device 1 is set at the bottom of the microalgae cultivation device 1, the microalgae cultivation device 1 is funnel-shaped; the microalgae transportation The other end of the device 2 is in communication with the coal gasification wastewater treatment device 3. The microalgae conveying device 2 is also provided with an aeration valve 4 and a conveying control valve 5; the system also includes a connection w...

Embodiment 2-4

[0058] This embodiment is used to illustrate the system and method for treating coal gasification wastewater using microalgae provided by the present invention.

[0059] The coal gasification wastewater was treated according to the system and method of Example 1. The difference is that the microalgae used were Fusarium falciparum, Lebnoceria leucocephala and Monofidophyta. In addition, the COD value of the coal gasification wastewater to be treated is 187mg / L, the ammonia nitrogen content is 23-25.5mg / L, the content of heavy metals mercury, cadmium, chromium, arsenic, lead, and nickel are all below 0.9mg / L, and the pH value is Is 7.0.

[0060] The above-mentioned microalgae after continuous domestication and cultivation of coal gasification wastewater were respectively sent to the coal gasification wastewater treatment system provided by the present invention for rapid treatment of coal gasification wastewater, and the ammonia nitrogen content in the coal gasification wastewater wa...

Embodiment 5

[0065] This embodiment is used to illustrate the system and method for treating coal gasification wastewater using microalgae provided by the present invention.

[0066] The coal gasification wastewater was treated according to the method of Example 1. The difference is that the COD value of the wastewater to be treated is 300 mg / L, the ammonia nitrogen content is 50-65 mg / L, and the heavy metals mercury, cadmium, chromium, arsenic, lead, and nickel are respectively The content is below 1mg / L, and the pH is 6.5. Scenedesmus tetracera can remove more than 95% of ammonia nitrogen in coal gasification wastewater with an ammonia nitrogen content of 50-65mg / L within 7-8 days (on the first day, the ammonia removal rate is 30-35%, the second day, the ammonia nitrogen removal rate 45-50%, on the 3rd day, the ammonia removal rate is 65-70%, on the 4th day, the ammonia nitrogen removal rate is 75-82%, on the 5th day, the ammonia nitrogen removal rate is 85-88%, on the 6th day, the ammonia ...

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Abstract

The invention provides a system and a method for treating coal gasification wastewater by using microalgae. The system for treating coal gasification wastewater by using microalgae comprises a microalgae breeding apparatus (1) provided with an inlet and an outlet, a microalgae conveying apparatus (2) and a coal gasification wastewater treating apparatus (3), wherein one end of the microalgae conveying apparatus (2) is communicated with the outlet of the microalgae breeding apparatus (1), the outlet of the microalgae breeding apparatus (1) is arranged at the lower part of the microalgae breeding apparatus (1), the other end of the microalgae conveying apparatus (2) is communicated with the coal gasification wastewater treating apparatus (3), and the microalgae conveying apparatus (2) is further provided with an air blowing valve (4) and a conveying control valve (5). With the system and the method for treating coal gasification wastewater by using microalgae provided by the invention, nitrogen, phosphorus and the like in coal gasification wastewater are purified, conversion, immobilization and emission reduction of carbon dioxide are realized, and resource utilization of coal gasification wastewater in culture of microalgae is realized.

Description

Technical field [0001] The invention relates to a system for treating coal gasification wastewater by using microalgae and a method for processing coal gasification wastewater by adopting the system. Background technique [0002] my country is a country rich in coal resources. To cope with the energy shortage caused by the declining oil and natural gas resources, stepping up the efficient and clean utilization of coal is very much in line with the needs of my country's national conditions. [0003] Coal-to-natural gas is an important way of efficient and clean utilization of coal. The coal-to-natural gas industry at home and abroad mainly adopts the crushed coal pressurized gasification process. The process is mature and the methane content in the synthesis gas is high, but the waste water produced by coal gasification is difficult to treat. This type of wastewater has complex components and contains high concentrations of phenol, ammonia nitrogen and other toxic and harmful pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
Inventor 于广欣卿人韦金阳汪乐霓纪钦洪丁一
Owner CHINA NAT OFFSHORE OIL CORP
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