Method and device for removing algal toxin in water by hydroxyl radical
A technology of free radicals and algae toxins, applied in chemical instruments and methods, energy wastewater treatment, water/sewage treatment, etc., can solve the problems of differences in treatment efficiency, improve gas-liquid mass transfer efficiency, and optimize miscible process mode and the effect of the parameter
Active Publication Date: 2015-02-11
XIAMEN UNIV
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Problems solved by technology
However, these advanced oxidation technologies have their own advantages in removing algae toxins, and the treatment efficiency of MCs in different water sources is also different.
How to efficiently, quickly and stably remove algal toxins from high-algae water without secondary pollution remains is a challenge faced by water treatment technology at present
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[0045] Slightly polluted water 8 containing algal toxins was obtained from a certain reservoir by adding toxin-producing algal strains, and the algae density was 5.1×10 8 cells / L, microcystin-LR was 42.8μg / L. The water body is injected into the system by the pump 9, and the water flow rate is 4L / min. While passing through the high-pressure jet device 11, the gas-liquid miscible device 12, and the gas-liquid separator 13, an oxygen plasma solution mainly composed of hydroxyl radicals is rapidly generated. The total oxidant concentration TRO is 1.38mg / L. The algae density at 16 outlets is 4 cells / L, microcystin-LR is 0.1 μg / L. The algae removal rate of the treatment method is close to 100%, and the algae toxin can be reduced to within 1.0 μg / L of the drinking water safety range.
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Abstract
The invention provides a method and a device for removing algal toxin in water by hydroxyl radical, and relates to water treatment. The method comprises the steps: a power supply is started; raw material gas enters into an oxygen plasma generation source and is subjected to ionization and dissociation to generate oxygen plasma gas, then the oxygen plasma gas is exhausted from the oxygen plasma generation source, one part of the gas enters into an oxygen plasma gas concentration detector, and the rest enters into a high-pressure ejector; the to-be-treated water is pumped into the high-pressure ejector and is mixed with the oxygen plasma gas entering into the high-pressure ejector, then the to-be-treated water flows into a gas-liquid mixing device for further mixing, the oxygen plasma gas not dissolved in the water is resolved as O2 to be exhausted through a gas-liquid separator and a remain gas eliminator; the oxygen plasma gas generates the hydroxyl radical in a main pipeline, in the mixing process and the transporting process of the main pipeline, during generating the hydroxyl radical, the algal toxin is rapidly oxidized and degraded in 0.1ms-6s, remained OH is degraded as H2O and O2 which are harmless to environment.
Description
technical field [0001] The invention belongs to the technical field of free radical chemistry and water treatment application, and in particular relates to a method and a device for removing algal toxins in water by hydroxyl radicals. Background technique [0002] At present, the degree of domestic water pollution and eutrophication continues to intensify, resulting in the frequent occurrence of algae blooms in water bodies, which greatly increases the exposure risk of toxin-producing algae to animal and plant life and human health. When the cyanobacteria bloom is serious, a thick blue-green lake indigo is formed on the water surface, which emits an unpleasant smell, which not only destroys a healthy and balanced aquatic ecosystem, but also produces and releases a variety of algae toxins from algal cells, which are harmful to humans and animals. The safety of drinking water poses a serious threat and poses new challenges to traditional water treatment processes. [0003] At...
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IPC IPC(8): C02F1/72C02F1/58
CPCY02W10/37C02F1/72C02F1/305C02F2303/04C02F2305/023
Inventor 白敏冬李海燕李芳黄金良黄凌风
Owner XIAMEN UNIV
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