Development of algae removal method based on positively charged bubbles

Kim, Tschung-il; Park, Hyun-Ju; Han, Myung Joo

doi:10.1007/s12205-017-0025-z

Cited by 10 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is widely used in drinking water treatment. However, because the surfaces of microbubbles (MBs) are negatively charged, problems such as poor adhesion of MBs to particles with negative charges on the surface and a small sweeping volume of MBs often exist in conventional DAF (Kim, Park, & Han, 2017). Because positive modification DAF (Posi‐DAF) can overcome the above problems, it has shown good application prospects in removing algae cells in drinking water in recent years.…”

Section: Introductionmentioning

confidence: 99%

The removal efficiency and mechanism of microplastic enhancement by positive modification dissolved air flotation

Wang

Tian

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

Microplastics (MPs) are widely distributed in freshwater and have the following characteristics: small size, strong hydrophobicity, difficult degradation, and easy adsorption of toxic substances. These characteristics pose a potential threat to the environment and human health. In this paper, three common MPs in freshwater were removed by conventional dissolved air flotation (DAF) and positive modification DAF (Posi‐DAF). The results showed that the optimal removal efficiency of MPs by conventional DAF was 32%–38% at 0.4–0.5 MPa. This indicated that the adhesion between microbubbles (MBs) and MPs was not ideal when the hydrophilic/hydrophobic interaction was the dominant mechanism. However, the removal efficiency of MPs was increased by 13.6%–33.7% compared with that of conventional DAF after two surface modifiers were used on MBs. This result indicated that in addition to the hydrophilic/hydrophobic interaction, both charge attraction and sweeping had positive effects. Practitioner points The removal efficiency and mechanism of MPs by posi‐DAF were investigated. The characteristics, particle number, and adhesion of microplastics were measured. Conventional DAF was dominated by hydrophilic/hydrophobic interactions. CTAB Posi‐DAF was dominated by charge attraction. PDADMAC Posi‐DAF was dominated by charge attraction and sweeping.

show abstract

Section: Introductionmentioning

confidence: 99%

The removal efficiency and mechanism of microplastic enhancement by positive modification dissolved air flotation

Wang

Tian

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…Although the removal of microalgae using the dissolved air flotation method has been reported by previous studies through the control of zeta potential, successful flotation relies on the efficiency of particle-bubble attachment (Henderson et al 2008;Kim et al 2017). The range of zeta potential between -8 and +2 mV provides optimum removal efficiency with respect to the combination of coagulant dose and pH adjustment for flotation (Henderson et al 2008).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, in order to enhance the collision efficiency between microalgal particles and bubbles, those values should be of opposite charges. Thus, low removal efficiency can be yielded when both bubbles and microalgal particles exhibit similar charges (Kim et al 2017). The addition of AFlok-BP1 caused a significant reduction of zeta potential value which enhanced the interaction between the bubbles and flocs.…”

Section: Effect Of Different Saturator Pressurementioning

confidence: 99%

“…Among the three different flotation approaches, DAF which can be subjected to large-scale application is being widely used for drinking water clarification and separation of microalgae from wastewater (Edzwald 2010;Gerardo et al 2015;Han et al 2007;Sharma et al 2013). However, the efficiency of DAF relies on several factors such as saturator pressure, recycle ratio, bubble or particle size, surface charge as well as initial algal concentrations (Kim et al 2017;Zhang et al 2014). Since flocculation is often applied as a pre-treatment method prior to DAF as mentioned earlier, suitable flocculant has to be selected to ensure effective flotation performance in order to enhance collision or adhesion between the bubbles and particles (Barros et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Since flocculation is often applied as a pre-treatment method prior to DAF as mentioned earlier, suitable flocculant has to be selected to ensure effective flotation performance in order to enhance collision or adhesion between the bubbles and particles (Barros et al 2015). Furthermore, several recent studies have reported on the positively charged bubble surface modification technique which is referred to as 'PosiDAF' to be effective in microalgae harvesting (Kim et al 2017;Laamanen et al 2016). This method eliminates the coagulation stage compared to the conventional DAF method where the chemicals are directly added into the saturator (Laamanen et al 2016).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Harvesting Marine Microalgae Nannochloropsis sp. using Dissolved Air Flotation (DAF) Technique

Fuad¹,

Omar²,

Kamarudin³

et al. 2021

JSM

View full text Add to dashboard Cite

The production of high-value bioproducts from microalgae biomass has been widely investigated. However, their production is hindered by the expensive harvesting process. To date, flocculation followed by DAF process has been accepted as one of the affordable harvesting approaches. In this study, the use of DAF technique was attempted to harvest marine microalgae Nannochloropsis sp. Batch DAF harvesting was carried out using fabricated DAF unit equipped with several compartments including separation column, product collecting vessel and rotary skimmer. Tannin-based biopolymer flocculant, AFlok-BP1 at pH 5 with a concentration of 160 mg/L was used to facilitate the flocculation of particles. The effects of different saturator pressure at 1.8, 2, and 2.2 bar were then evaluated at a constant volume of 6 L microalgae culture. The effects of different microalgae culture volumes (6, 8 and 10 L) were also evaluated at a fixed saturator pressure of 2.2 bar. The highest pressure at 2.2 bar yielded the best result with the highest total solid of 3.19 ± 0.01% and a maximum yield of 1.70 ± 0.05 g/g (wet basis). The microalgae concentration was the lowest (0.027 g/L) when 6 L of culture volume was used. However, the values were significantly higher when the culture volume was increased to 8 and 10 L to approximately 0.035 and 0.050 g/L, respectively. As a conclusion, the study provided evidence for the feasibility of DAF technique in harvesting marine microalgae Nannochloropsis sp.

show abstract

Influence of algal organic matter in the in-situ flotation removal of Microcystis using positively charged bubbles

Cheng,

Zhang,

Wang

et al. 2024

Bioresource Technology

View full text Add to dashboard Cite

Development of algae removal method based on positively charged bubbles

Cited by 10 publications

References 13 publications

The removal efficiency and mechanism of microplastic enhancement by positive modification dissolved air flotation

The removal efficiency and mechanism of microplastic enhancement by positive modification dissolved air flotation

Harvesting Marine Microalgae Nannochloropsis sp. using Dissolved Air Flotation (DAF) Technique

Influence of algal organic matter in the in-situ flotation removal of Microcystis using positively charged bubbles

Contact Info

Product

Resources

About