An investigation of hybrid approaches combining ozonation and bubble technologies for algae treatment.

Harmful Algae Blooms (HABs) are increasingly prevalent due to climate warming, urbanization, and industrialization. Recently, the oxidation process has emerged as a crucial method when supplying water impacted by algal blooms. Various oxidants, such as chlorine, hydrogen peroxide, or potassium permanganate, are commonly introduced into the process to treat the water containing algae. However, there are several drawbacks; for example, chlorination can result in the formation of disinfection by-products. 

Ozone, a strong oxidizing agent with great potential for disinfection and leaving no harmful residual by-products, becomes an attractive choice for algae treatment. Compared to other oxidants, it can effectively remove a wide range of microorganisms, organic matter and even break down toxins produced by specific algae species, However, its low solubility and stability properties present key challenges in this research area. Consequently, further investigation is essential to optimize the ozonation process and unlock its full potential for algae treatment application. 

The aims of this project are:

a. To develop a comprehensive understanding of the kinetics and mechanisms of the ozonation technique on algae cell treatment.  

b. To evaluate the benefit of delivering ozone through micro- and nano- bubbles, with a focus on the influence of bubble size and ozonation efficiency for algae treatment.

c. To examine a hybrid approach using surface-modified microbubbles that combines oxidation and flotation in a single unit operation for improved algae cell treatment and separation.