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Method for purifying water by killing algae by using micro-current and application thereof

A water purification and micro-current technology, applied in the direction of magnetic/electric field water/sewage treatment, etc., can solve the problems that explosive algae pollution cannot be quickly controlled, the water environment is complex and variable, and is not suitable for large-scale applications, etc., achieving low cost, The effect of controlling algae pollution and controlling algae bloom

Inactive Publication Date: 2012-07-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, the salvage method is to manually salvage the algae out of the water, which can directly kill the algae, and the effect is reliable. The disadvantage is that the workload is large and the cost is high; the membrane filtration method uses membrane treatment technology and corresponding devices to filter plankton and bacteria. etc. Although algae can be effectively removed, there is a problem that the cost is too high and it is not suitable for large-scale applications; ultrasonic algae killing uses mechanical vibration, acoustic flow and cavitation effects to cause damage, fracture or crushing of biological cell tissues, which has The advantages of convenient operation, high efficiency, no pollution or low pollution, the disadvantage is that it takes too long to act, sometimes as long as several months, and cannot quickly control the explosive algae pollution
[0006] Due to the shortcomings of existing methods and the complexity and variability of the water environment, domestic and foreign scholars have not stopped exploring new algicidal methods to achieve the goals of more obvious algicidal effect, more environmental friendliness, and lower cost.

Method used

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  • Method for purifying water by killing algae by using micro-current and application thereof
  • Method for purifying water by killing algae by using micro-current and application thereof
  • Method for purifying water by killing algae by using micro-current and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Electricity mode and algae killing effect

[0019] In a cylindrical container (height 36cm, bottom area 21cm 2 ), add 500ml of Microcystis aeruginosa culture medium (BG11 medium) with an algal cell concentration (chlorophyll a) of 500 μg / L, and the height of the algal cell suspension reaches 24 cm. Place a round carbon cloth with the same area as the bottom area of ​​the container at the bottom and liquid level of the container, and connect the upper and lower carbon cloths with copper wires and connect to the DC power supply. The connection methods include the liquid surface carbon cloth to the negative electrode and the bottom carbon cloth to the positive electrode (upper (Negative, lower positive) and liquid surface carbon cloth connected to the positive electrode, bottom carbon cloth connected to the negative electrode (upper positive and lower negative). Power on and adjust the current density between the upper and lower carbon cloth electrodes at 0.1~2.0mA...

Embodiment 2

[0022] Example 2: Electricity mode and water purification effect

[0023] Using the same method as in Example 1, the purifying effect of the upper-negative and lower-positive energization method on the algae water body was studied for 5, 30 and 60 minutes. The number of algae cells in the water body is 1.2×10 6 Pcs / ml, energize and adjust the current density between the upper and lower carbon cloth electrodes at 0.1~2.0mA / cm 2 Within the range, the number of algae cells in the water body was investigated 1 day after power on. The results are shown in Table 2. The number of algae cells in the water body decreased by 94.1%, 95.8%, and 98.1%, respectively, after 5, 30, and 60 minutes of electrification treatment for 1 day. It shows that this method has a good purification effect on algae polluted water.

[0024] Table 2. Purification effect of micro current treatment on algae polluted water

[0025]

Embodiment 3

[0026] Example 3: Algae density and algae killing effect

[0027] The same method as in Example 1 was used to study the algae-killing effects of different algae densities for 5, 30 and 60 minutes with upper-negative and lower-positive energization. The algae cell density (chlorophyll a) was 500μg / L (low) and 1000μg / L (medium), 1500μg / L (high). The results show (Table 3) that for the same energization time, as the concentration of algae cells increases, the algae killing rate decreases; in the case of low concentration, prolonging the energizing time cannot increase the algae killing rate, but in the case of high concentration If the power-on time is extended, the algae killing rate can be significantly improved.

[0028] Table 3. Algae killing rate (%) of three kinds of algae density for different micro-current treatment time

[0029]

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Abstract

The invention belongs to the technical field of water pollution control and particularly relates to a method for purifying water by killing algae by using micro-current and the application of the method. The method is characterized in that two electrodes are put in water with algae and connected with a direct-current motor so that the upper electrode and the lower electrode have a certain current density, and the alga cells are killed after a certain period of time and sunken to the bottom of the water so that the water is purified. The micro-current has the significant function of killing a variety of algae including microcystis, aphanizomenon, anabaena, quadrigula chodatii and scenedesmus and is suitable for lakes, ponds and other water environment.

Description

1. Technical Field [0001] The invention belongs to the technical field of water pollution control. Specifically, it relates to a method and application for purifying water by using microcurrent to kill algae. 2. Background technology [0002] The proliferation of algae cells in the water body seriously affects the quality of water, and then has harmful effects on the safety of aquatic animals and plants, drinking water, and irrigation water. Therefore, the control of algae pollution in water bodies has become one of the important contents of water environmental pollution control. There are three main types of algae control methods commonly used at present: chemical methods, biological methods and physical methods. [0003] The chemical method is to use copper sulfate, quaternary ammonium salt, potassium permanganate, ferrous sulfate and other chemicals to kill algae directly or through processes such as flocculation and sedimentation. However, large-scale and long-term use of ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48
Inventor 刘常宏郭利川朱明睿赵潭溪薛雅蓉
Owner NANJING UNIV
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