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Device and method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater

An advanced treatment and bio-oil technology, which is applied in the preparation of liquid hydrocarbon mixtures, energy wastewater treatment, sustainable biological treatment, etc., can solve the problems of difficult sludge treatment, poor removal effect of nitrogen and phosphorus nutrients, and high cost of chemical agents. Achieve the effects of increasing the removal rate of nitrogen and phosphorus, increasing the density of algae cells, and reducing the risk of algal blooms

Inactive Publication Date: 2010-07-07
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies at home and abroad have shown that although conventional sewage treatment processes can remove most of the organic and inorganic pollutants in sewage, the removal effect on nitrogen and phosphorus nutrients is poor.
The phosphorus removal effect of the chemical method is good, but the cost of the chemical agent is high, and the generated sludge is difficult to treat

Method used

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  • Device and method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater
  • Device and method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater
  • Device and method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To the artificially configured medium (total nitrogen and total phosphorus were 15mg·L -1 and 1.5mg·L -1 , the rest of the components were inoculated with Scenedesmus LX1 in the same diluted 50% BG11 medium), and the initial inoculation density was about 6×10 5 pcs mL -1 , cultured under the conditions of white light and different ratios of LED red and blue light (light-to-dark ratio 14h:10h, light intensity 1400lux).

[0030] Chlorophyll in algae cells mainly absorbs red and blue light in natural light for photosynthesis. Therefore, under the same light intensity, the growth rate of Scenedesmus LX1 can be significantly accelerated by using LED red and blue light as the light source. From the first day after inoculation, the algal cell density of Scenedesmus LX1 was significantly higher than that of white light as the light source until the algal cell growth entered a stable period. With white light as the light source, Scenedesmus LX1 enters the stable period when i...

Embodiment 2

[0032] The culture conditions and light conditions of Scenedesmus LX1 are the same as those in Example 1.

[0033] Since the growth rate of Scenedesmus LX1 is accelerated under the LED red and blue light source (Example 1), the rate of removal of nitrogen and phosphorus by algal cells will also be significantly improved. Under the LED red and blue light source, the total nitrogen content in the medium was significantly lower than that under the white light source from the first day after inoculation until the total nitrogen in the medium was almost completely removed. Using white light as the light source, the removal rate of total nitrogen can reach 97% until the 12th day of cultivation; using LED red and blue light as the light source, the removal rate of total nitrogen can reach 97% after the 9th day of cultivation ( figure 2 (a)).

[0034] Under the red and blue LED light source, Scenedesmus LX1 promoted the removal of total phosphorus similarly to that of total nitrogen...

Embodiment 3

[0036] Using the effluent of the secondary sedimentation tank of a certain urban domestic sewage treatment plant as the medium, Scenedesmus LX1 was cultivated directly (the effluent of the secondary treatment was not filtered or sterilized). The water quality conditions of the effluent of the secondary treatment are shown in Table 1. The culture conditions are : White light intensity 1400lux, light-to-dark ratio 14h:10h, temperature 25°C, relative humidity 75%. The initial inoculation density of Scenedesmus LX1 was 5×10 6 pcs mL -1 .

[0037] Table 1

[0038]

[0039] Water quality index Index value

[0040]

[0041] Total nitrogen (mg·L -1 ) 22.2±0.2

[0042] Ammonia nitrogen (mg·L -1 ) not detected

[0043] Total phosphorus (mg·L -1 ) 0.48±0.02

[0044] COD Cr (mg·L -1 ) 15.6±3.2

[0045] Suspended matter (mg·L -1 ) 6.2±0.8

[0046] pH 7.04

[0047] Turbidity (NTU...

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Abstract

The invention discloses a device and a method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater, which belongs to the technical field of water pollution control. The device is arranged after secondary wastewater treatment, and nutrient elements of nitrogen, phosphorus and the like can be absorbed by the photosynthesis of algae cells, and thus, the nitrogen and phosphorus concentration in secondary wastewater treatment effluent can be further reduced, thereby lowering the risk of water bloom eruption because the sewage plant effluent is discharged behind scenic water; the device can be applied to the deep treatment of the wastewater. The growth rate of the algae cells and the nitrogen and phosphorus removal rate can be increased by taking Scenedesmus sp.LX1 as a nitrogen and phosphorus removal dominant algae by adopting an LED red and blue light source; and the algae density in a reactor and the nitrogen and phosphorus removal can be increased by adopting a membrane separation mode and a dense algae liquid reflux mode. Meanwhile, grease can be further extracted by separating the obtained dense algae liquid, and the wastewater is taken as the resource to produce the biological oil. The method has the advantages of good nitrogen and phosphorus removal effect, high economic benefit and the like.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a device and a method for coupling production of bio-oil by utilizing microalgae for advanced treatment of sewage. Background technique [0002] With the development of human economic activities, a large amount of nutrients such as nitrogen and phosphorus are discharged into the water body, and accumulate and enrich, causing eutrophication of the water body, resulting in abnormal reproduction of algae (mainly blue-green algae and green algae), and rapid deterioration of water quality. Controlling the entry of nitrogen and phosphorus into water bodies is the fundamental measure to prevent water eutrophication. A large number of studies at home and abroad have shown that although conventional sewage treatment processes can remove most of the organic and inorganic pollutants in sewage, the removal effect on nitrogen and phosphorus nutrients is poor. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C10G1/00C02F1/30C02F1/44C02F3/12C02F3/34
CPCY02W10/10Y02W10/37
Inventor 胡洪营李鑫苏贞峰野口勉稻垣靖史
Owner TSINGHUA UNIV
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