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A membrane electrocoagulation device and a method for harvesting microalgae using the device

A technology of electrocoagulation and microalgae, which is applied in chemical instruments and methods, single-cell algae, energy wastewater treatment, etc., can solve the problems of destroying algae cells, reducing yield, and high electrode cost, so as to improve flocculation rate and cleanliness degree of effect

Active Publication Date: 2016-03-02
TIANJIN INST OF IND BIOTECH CHINESE ACADEMY OF SCI
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  • 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 Therefore, it cannot be directly applied to industries such as food, medicine and fishery feed; the chlorine gas generated by the anode in electrocoagulation strongly destroys algae cells and reduces the yield; the composition of non-nutritive metal ions in the medium changes irreversibly, which is not conducive to the reuse of the medium

Method used

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  • A membrane electrocoagulation device and a method for harvesting microalgae using the device
  • A membrane electrocoagulation device and a method for harvesting microalgae using the device
  • A membrane electrocoagulation device and a method for harvesting microalgae using the device

Examples

Experimental program
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Effect test

Embodiment 1

[0055] 1L scale microalgae membrane electrocoagulation harvesting

[0056] Materials and methods: The membrane electrocoagulation device used in this example is according to figure 1 and figure 2 And formulate. Prepare the fixed frame with plexiglass. The outer dimensions of the finished product are: 17*4*14cm (length*width*height). Put the device into the algae pool 7 with an inner size of 13.5*6.5*17.5 (length*width*height). Place 100mL0.1MNa in the anode area 3 2 SO4 solution; 50 mL of artificial seawater with a salinity of 3% is placed in the acid chamber 6 . 1L of Nannochloropsisoculata algae liquid is placed in the algae pond 7, and the biomass of the algae liquid is about 1.4g / biomass. A stainless steel mesh is used as the cathode electrode 4, and a DSE oxygen evolution electrode is used as the anode electrode 1. Electrolyze at a constant current of 0.5A for 10min, 15min, 20min, 25min, 30min, and 35min respectively. After electrolysis, put the algae solution into ...

Embodiment 2

[0070] Microalgae membrane electrocoagulation harvesting in 150L raceway pool scale

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

Embodiment 3

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

[0078] Materials and Methods:

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

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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 electrocoagulation device and a microalgae harvesting method 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, and environmental pollution. Therefore, more and more natural science research focuses on the development and utilization of new energy sources, environmental bioremediation, 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 research hotspot because of some unique characteristics. These characteristics include: (1) Microalgae are widely distributed in oceans, lakes, tidal flats and other waters, and there are various types...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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