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Membrane electroflocculation device and method for microalgae harvesting by utilizing same

An electro-flocculation and microalgae technology, applied in chemical instruments and methods, single-cell algae, energy and wastewater treatment, etc., can solve the problems of destroying algal cells, reducing yield, and high cost of electrodes, improving flocculation rate and improving cleanliness. degree of effect

Active Publication Date: 2015-02-25
TIANJIN INST OF IND BIOTECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anode loss electroflocculation technology is still in the immature stage, and there are many defects: high energy consumption, about 2-4kWh/kgbiomass; anode iron/aluminum plate is continuously corroded and lost, and then the cost of the electrode is huge; flocculation substances such as iron and aluminum salts enter the algae mud The

Method used

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  • Membrane electroflocculation device and method for microalgae harvesting by utilizing same
  • Membrane electroflocculation device and method for microalgae harvesting by utilizing same
  • Membrane electroflocculation device and method for microalgae harvesting by utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1L-scale Microalgae Membrane Electroflocculation Harvesting

[0056] Materials and methods: The membrane electroflocculation device used in this example was figure 1 and figure 2 and formulate. Use plexiglass to prepare the fixed frame. The outer dimensions of the finished product are: 17*4*14cm (length*width*height). The device was placed in an algae pond 7 with an inner dimension of 13.5*6.5*17.5 (length*width*height). Place 100mL of 0.1M Na in anode zone 3 2 SO4 solution; 50 mL of artificial seawater with a salinity of 3% is placed in the acid chamber 6 . 1L Nannochloropsis oculata algae liquid was placed in the algae pool 7, and the biomass of the algae liquid was about 1.4g / biomass. The stainless steel mesh is used as the cathode electrode 4 , and the DSE oxygen evolution electrode is used as the anode electrode 1 . 0.5A constant current electrolysis was performed for 10min, 15min, 20min, 25min, 30min, and 35min respectively. After the electrolysis, the algal...

Embodiment 2

[0070] 150L runway pond scale microalgae membrane electroflocculation harvesting

[0071] Materials and methods: A membrane electroflocculation device was fabricated as in Example 1, and the external dimensions were: 30*5*20cm (length*width*height). The device is placed in the raceway pond algae pond 7 and is radially parallel to the water flow. A 0.1M Na2SO4 solution is placed in the anode area 3 until it is the same height as the algal liquid level; artificial seawater with a salinity of 3% is placed in the acid chamber 6 until the same level as the algal liquid level. The algae pool 7 is Nannochloropsis oculata algal fluid, and the algal fluid biomass is about 1.4g / biomass. The stainless steel mesh is used as the cathode electrode 4 , and the DSE oxygen evolution electrode is used as the anode electrode 1 . Electrolysis was performed at a constant current of 10A for 20min, 40min, 60min, 80min, 100min, 120min, 140min, and 160min, respectively. After the electrolysis, the a...

Embodiment 3

[0077] Example 3 The washing effect of membrane electroflocculation device on algae

[0078] Materials and Methods:

[0079] As in Example 1, N. oculata was harvested by electroflocculation of microalgal membranes on a 1 L scale. Using stainless steel mesh as cathode electrode 4, DSE oxygen evolution electrode as anode electrode 1, electrolysis with 2A constant current for 5min, 10min, 15min respectively, the voltage of 1L algae solution is stable between 9.9 and 10.5. After the electrolysis was completed, the pH of each part was measured. Then, the acid chamber 6 liquid and the algae liquid were mixed, the other group was not mixed, centrifuged at 10,000 rpm for 6 min, the supernatant was taken, and the calcium and magnesium ion concentrations and pH were determined by EDTA.2Na titration method. Similarly, the algal mud with two different treatments, washed and unwashed, was taken for the determination of pigment concentration, and oil extraction and determination were carr...

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Abstract

The invention discloses a membrane electroflocculation device and a method for microalgae harvesting by utilizing the same. An anode area is formed by bipolar membranes, a positive electrode is placed in the anode area, cathode membranes and negative electrodes are connected to form cathodes, the cathodes are arranged around the anode area at a certain interval, and space formed between the cathodes serves as acid chambers; an algae pool is taken as a cathode area, the membrane electroflocculation device allows positive and negative ions to selectively penetrate, the memberane electroflocculation device is placed in algae liquid, calcium and magnesium ions in the algae liquid form a flocculatant under action of electric field force, and the algae liquid is enabled to be in an alkali-induced flocculation reaction, so that flocculation rate of the algae liquid is increased greatly. By the membrane electroflocculation device, flocculation rate can be ensured to be larger than 90% while concentration ratio is larger than 15 times after 2 hours when hydrolysis is finished. By the membrane electroflocculation device, acid liquid containing nutrient mineral elements in a culture medium substrate can be synthesized in the acid chamber, the mineral elements adhered in algae mud can be recycled by utilizing the acid liquid to clean the algae mud, and repeated culturing of microalgae can be realized.

Description

technical field [0001] The invention relates to the field of microalgae harvesting, in particular to a membrane electric flocculation device and a method for microalgae harvesting by using the device. Background technique [0002] With the depletion of non-renewable fossil energy and increasingly severe environmental problems, the world is facing global problems such as energy crisis, climate warming, food shortage, land shortage, environmental pollution and so on. Therefore, more and more natural scientific research focuses on the development and utilization of new energy, the bioremediation of the environment, and the development and utilization of recyclable materials. [0003] In the development and utilization of new energy and the bioremediation of the environment, microalgae have become a hot research material because of their unique characteristics. These features include: (1) Microalgae are widely distributed in oceans, lakes, tidal flats and other waters, with a w...

Claims

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Application Information

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IPC IPC(8): C02F1/463C12N1/12
CPCY02W10/37
Inventor 刘晨风陈方见陈树林侯余勇刘智永
Owner TIANJIN INST OF IND BIOTECH CHINESE ACADEMY OF SCI
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