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Low-nutrition scenedesmus and application thereof in sewage deep treatment

A technology for advanced treatment of Scenedesmus, applied in biological water/sewage treatment, water/sludge/sewage treatment, single-cell algae, etc. Dealing with other issues to achieve the effect of reducing the risk of algal blooms

Inactive Publication Date: 2009-10-28
TSINGHUA UNIV
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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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  • Low-nutrition scenedesmus and application thereof in sewage deep treatment
  • Low-nutrition scenedesmus and application thereof in sewage deep treatment
  • Low-nutrition scenedesmus and application thereof in sewage deep treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Secondary effluent to urban sewage (total nitrogen TN is 26.6mg·L -1 , Total phosphorus TP is 3.9mg·L -1 ) Is inoculated with Scenedesmus species, the initial inoculation density is 1.5×10 5 A·mL -1 ,Under the conditions of light-dark ratio 14h:10h, temperature 25℃, relative humidity 75%, light intensity 800~1300lux, at the same time algae cells photosynthesize to absorb nitrogen and phosphorus nutrients. After 13 days of culture, high-speed centrifuge (10000rpm ×10min, 4°C) Centrifuge the Scenedesmus algae liquid, harvest Scenedesmus, and obtain the municipal sewage tertiary effluent with very low nitrogen and phosphorus concentration.

[0018] The removal rates of this strain of Scenedesmus on nitrogen and phosphorus in the secondary effluent of municipal sewage were 95.8% and 96.1%, respectively. The removal rate of Microcystis aeruginosa (Microcystis aeruginosa source: freshwater algae seed bank) under the same culture conditions was 95.8% and 96.1%. Respectively 93.6% ...

Embodiment 2

[0020] The initial inoculation density of Scenedesmus is 1.25×10 5 A·mL -1 , 1.25×10 6 A·mL -1 , 6.25×10 6 A·mL -1 And 1.25×10 7 A·mL -1 , In the artificially simulated secondary effluent of urban sewage (total nitrogen TN is 15.0mg·L -1 , Total phosphorus TP is 2.0mg·L -1 ) After culturing for 3 days, the removal rates of TN were 11.0%, 40.1%, 59.3% and 74.7%; 3 -N removal rates are 98%, >99%, >99% and >99%; the removal rates of TP are 47.5%, 98.9%, 98.9% and >99% ( figure 2 ). It can be seen that increasing the initial inoculation density can significantly enhance the water purification effect of this strain of Scenedesmus on urban sewage.

Embodiment 3

[0022] In the artificially simulated secondary effluent of urban sewage, the fixed initial total nitrogen TN is 11mg·L -1 , Control the initial total phosphorus TP to be 0.1, 0.2, 0.5, 1.0 and 2.0 mg·L respectively -1 . Inoculate Scenedesmus according to the method in Example 1, the inoculation density is 2.4×10 5 A·mL -1 . The removal of nitrogen and phosphorus in the secondary effluent of five artificial simulated urban sewage by Scenedesmus is shown in Figure 3(a) and Figure 3(b). After 13 days of cultivation, the removal rate of TP in the secondary effluent of five artificially simulated urban sewage basically reached 100% by Scenedesmus, indicating that the removal of TP by Scenedesmus was not greatly affected by the N / P ratio (relative content of nitrogen and phosphorus). The initial TP is 0.1, 0.2, 0.5, 1.0 and 2.0 mg·L, respectively -1 Under the conditions, the removal rate of TN by Scenedesmus vulgaris was 38.8%, 64.0%, >99%, >99% and >99%, respectively. It can be seen th...

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Abstract

The invention discloses low-nutrition scenedesmus sp. LX1 in the technical field of water pollution control and the application thereof in sewage deep treatment. Firstly, the scenedesmus is inoculated in second-grade effluent water of municipal sewage, and through the photosynthesis of algae cells, the scenedesmus absorbs nutrient elements in the second-grade effluent water such as nitrogen, phosphorus and the like in the process of growth, thus further reducing the concentration of nitrogen and phosphorus in the effluent water of a municipal sewage treating plant. As the scenedesmus can grow in low-nutrition environment, the nitrogen and phosphorus in the second-grade effluent water can be removed to a quite low level, thus reducing the risk of water bloom breakout to the maximum extent; the scenedesmus is used for removing the nitrogen and phosphorus from the second-grade effluent water of municipal sewage, which is a sewage deep treatment method with eco-friendliness, low cost, high economic efficiency and easy use, and the method has the advantages of easy cultivation of the algae cells, good effect of removing the nitrogen and phosphorus and the like.

Description

Technical field [0001] The invention relates to a low-nutrient Scenedesmus and its application in advanced sewage treatment, and belongs to the technical field of water pollution control. Background technique [0002] With the development of human economic activities, a large number of nutrients such as nitrogen and phosphorus are discharged into the water body, and accumulated and enriched, causing the eutrophication of the water body, causing the abnormal reproduction of algae (mainly cyanobacteria and green algae), and rapidly deteriorating water quality. Controlling the entry of nitrogen and phosphorus into water bodies is a fundamental measure to prevent eutrophication of water bodies. A large number of domestic and foreign studies have shown that although conventional wastewater treatment processes can remove most of the organic and inorganic pollutants in wastewater, they have poor removal effects on nitrogen and phosphorus nutrients. The chemical method has a good phospho...

Claims

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Application Information

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IPC IPC(8): C12N1/12C02F3/32C12R1/89
Inventor 胡洪营李鑫杨佳
Owner TSINGHUA UNIV
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