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System for treating sewage and producing biological oil by using microalgae and method

A bio-oil and sewage technology, applied in the fields of energy and wastewater treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of limited development of photobioreactors, achieve an excellent algal cell growth environment, good effect, well-structured effect

Active Publication Date: 2013-11-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although microalgae have high environmental and economic value, the real realization of industrialized economic utilization of microalgae is still limited by the development of photobioreactors for the industrial scale cultivation of microalgae

Method used

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  • System for treating sewage and producing biological oil by using microalgae and method
  • System for treating sewage and producing biological oil by using microalgae and method
  • System for treating sewage and producing biological oil by using microalgae and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The f / 2 medium (pH 7.0) common to green algae was used for the seed liquid culture in the shake flask, and the sewage medium (pH 7.0) was used for both the seed tank culture and the photobioreactor 1 culture. Sewage culture medium is the secondary effluent of municipal sewage and industrial sewage treated by sewage treatment plant after filtering and removing impurities or algae (total nitrogen is 30.0-50.0mg / L, ammonia nitrogen is 10.0-16.0mg / L, total phosphorus The culture medium formed with a concentration of 2.0 to 4.0 mg / L) is added to the photobioreactor 1 through the feeding port / inoculation port 19 and sterilized, and the initial seeding density is 6.0×10 7 cfu / ml, stirring speed is 120rpm, light intensity is 15000lux, light cycle is 16h:8h, culture temperature is 30℃, pH is 7.0, CO 2 gas CO 2 The concentration is 30% (v / v), and the ventilation rate is 0.1VVm. Before dividing the culture, the algae concentration in the photobioreactor 1 is as high as 2.0×10 aft...

Embodiment 2

[0084]The continuous fermentation method is adopted and the municipal sewage and industrial sewage after filtering and removing impurities or algae are the secondary effluent treated by the sewage treatment plant as the medium, and the medium is inoculated with Chlorella C9-JN2010. The contact density is 3.5×10 7 cfu / ml, the light cycle is 14h:10h, the light intensity is 5000 lux, the culture temperature is 25°C, the pH is 8.5, and the CO 2 gas CO 2 Concentration of 25.0% (v / v), ventilation volume of 0.2VVm, continuous culture for 480h, nitrogen and phosphorus removal effect, CO 2 See the relationship between the conversion rate (%(v / v)) and oil accumulation of Figures 7A-7B shown.

[0085] Depend on Figure 7A The analysis shows that in the early stage of continuous culture, with the extension of culture time, its effect on nitrogen, phosphorus and CO 2 utilization is accelerated. The utilization rate of nitrogen was accelerated in 0~120h, and then the removal rate rea...

Embodiment 3

[0088] The batch fermentation method is adopted and the municipal sewage and industrial sewage after filtering and removing impurities or algae are the secondary effluent of the sewage treatment plant as the culture medium, and the culture medium is inoculated with Chlorella C9-JN2010. Density is 1.0×10 7 cfu / ml, the light cycle is 10h:14h, the light intensity is 7500 lux, the culture temperature is 20 °C, the pH is 6.5, and the CO 2 The concentration of 15.0% (v / v), the ventilation rate of 0.01VVm, batch culture for 480h, nitrogen and phosphorus removal effect, CO 2 See the relationship between the conversion rate (%(v / v)) and oil accumulation of Figures 8A-8B shown.

[0089] Depend on Figure 8A The analysis shows that in the early stage of cultivation, with the extension of cultivation time, its effect on nitrogen, phosphorus and CO 2 utilization is accelerated. In 0-168h, the nitrogen utilization rate was accelerated and the removal rate was as high as 98.0% (W), and...

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Abstract

The invention provides a system for treating sewage and producing biological oil by using microalgae. A first light source device and a second light source device of the system are respectively arranged in a photo-biological reactor and an oil accumulating tank; a CO2 gas supply device is respectively connected with the photo-biological reactor and the oil accumulating tank through air passages; a sewage sedimentation tank is connected with the oil accumulating tank through a pipeline and connected with the photo-biological reactor via a pipeline through a microalgal liquid mixing tank; the photo-biological reactor is respectively connected with the microalgal liquid mixing tank and the oil accumulating tank via pipelines through a first microalgal liquid separating device; and the oil accumulating tank is connected with a second separating device through a pipeline. The invention further provides a method for using the system to treat sewage and produce biological oil. Through the use of the invention, the production of biological energy sources and other byproducts (such as protein, cosmetic raw materials, animal feed and the like) is realized while sewage is treated, so that the production cost is lowered, and the comprehensive utilization of waste resources and the energy-saving and emission-reducing green production are achieved. The invention is suitable for cultivating microalgae from a laboratory to a factory, is skillful and unique in design, and is applicable to large-scale promotion and application.

Description

technical field [0001] The present invention relates to the technical field of environmental engineering and biological energy, and more particularly, to the technical field of photobioreactors, in particular to a system and method for treating sewage and producing biological oils by using microalgae. Background technique [0002] Today, energy shortage, environmental pollution and food shortage are three major world problems. Microalgae play a very important role in solving the above problems. [0003] Microalgae are photoautotrophic microorganisms with efficient light utilization and rapid and efficient absorption of nutrients (such as CO2) from the environment. 2 , nitrogen, phosphorus, etc.) and the ability to convert into organic compounds, is the primary producer in the ecosystem, plays a huge role in the entire material cycle, has high production efficiency, and has attractive development prospects. Microalgae culture only needs some simple nutrients, ammonium or ni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C12P7/64
CPCY02W10/37
Inventor 杨海麟张玲夏小乐辛瑜王武李昌灵李宇佶
Owner JIANGNAN UNIV
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