Abstract
At present, there are few studies on known bacterial species and even less on fungi in biological algae control technology. In this paper, the green eutrophic shallow water lake Scenedesmus quadricauda (Turpin) was used as the research object, and white rot fungi, which has a high removal effect on water pollutants, algae and biological toxins, was used for algae control. The extent of the removal effect, physiological characteristics and the internal functional groups of the algae cells in the white rot fungi solution, the supernatant of the white rot fungi solution after centrifugation and the sterilized white rot fungi solution were investigated. The results showed that the best algae solubilization effect of the algae control system was achieved at 250 mg/L, with 8 mg/L of dissolved oxygen and a hydraulic retention time of 48 h. The average algae lysis rate was 85.48%, the average dehydrogenase activity reduction rate was 59.23%, the average soluble protein reduction rate was 65.16% and the average malondialdehyde content increased to 0.128 umol/L. After treatment with the white rot algae control system, the spatial structure of the Turpin cells was severely disrupted, and significant lysis occurred within the algal cells, forcing the release of intracellularly soluble substances, and reducing the dehydrogenase activity of the Turpin cells, thus inhibiting the growth activity of the algae cells. A further reduction in the soluble protein content reduces the nutrients required for the growth of Turpin, exacerbating the rate of reduction in the physiological metabolic activity of the Turpin cells and, ultimately, the inhibition or killing of the algal cells. The results of this research may provide theoretical guidance for the microbial control of water eutrophication; however, whether there will be secondary pollution after the algae dissolution of this process is worthy of further study.
Highlights
With the influence of human and industrial activities, algal blooms, induced by water eutrophication, have become a serious threat to water ecology and human health around the world [1,2]
The results demonstrate that the algolytic effect of the white rot fungi liquid on Turpin is significantly better than that of the supernatant after centrifugation and the sterilized fungi liquid
According to the abo phenomena and results, it is speculated that the algae lysis method of white rot fungi may mentioned experimental phenomena and results, it is speculated that the algae ly initially be that white rot fungi directly lyses algae
Summary
With the influence of human and industrial activities, algal blooms, induced by water eutrophication, have become a serious threat to water ecology and human health around the world [1,2]. Physical and chemical methods are effective in controlling algae, they cannot fundamentally address the problem of algal recurrence, and are slightly less economically and environmentally sound than biological methods, with the risk of secondary pollution. It is, important to explore stable, efficient and safe biological algae control techniques. As a new type of green water treatment technology, without secondary pollution, plays a role in degrading inorganic salts in water, improving the quality of the water environment and inhibiting the growth of harmful algal blooms [4], which is incomparable to that of aquatic animals and plants, and is simple, efficient and ecologically compatible
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