Algae separation from urban landscape water using a high density microbubble layer enhanced by micro-flocculation

Chen, Shuwen; Xu, Jiang; Liu, Jia; Wei, Qiaoling; Li, Guangming; Huang, Xin

doi:10.2166/wst.2014.258

Cited by 5 publications

(3 citation statements)

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“…The dense and thick micro-bubbles collide and adhere to micro-flocculants (40-60 µm) of algae and suspended matter, then are separated from the water. The best algae separation, as determined by Chl-a, was 88.46% with an outflow concentration of 13.84 mg m −3 , when hydraulic loading, flocculation dosage and the micro-bubble layer height were 5 m h −1 , 4 mg L −1 and 130 cm, respectively [42].…”

Section: Water Quality Maintenance Hab Early Warning and Emergency Mmentioning

confidence: 97%

Characteristics of Atmospheric Deposition during the Period of Algal Bloom Formation in Urban Water Bodies

et al. 2019

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Urban water bodies are limited by poor mobility, small surface areas, and little water supply; thus, they are sensitive to atmospheric nutrient inputs, especially during the optimal period of algae growth. This study investigated the impact of atmospheric deposition on the Quyang urban water body in Shanghai. Observations that coupled atmospheric organic matter, nitrogen and phosphorous and the actual urban water body (nutrient availability and Chlorophyll-a concentrations (Chl-a)) were conducted during spring and summer. Atmospheric total organic carbon (TOC), total nitrogen (TN), ammonia (N-NH4+) and total phosphorus (TP) deposition ranged from 35–81, 3–40, 0.79–20.40 and 0.78–0.25 mg m−2 d−1, respectively. The soluble N/P molar ratios of the bulk deposition (ranging from 56–636) were well above the Redfield ratio (N/P = 16). Nutrient inputs from atmospheric deposition have been suggested to be a strong factor for increasing the likelihood of P limitation in the water bodies. The actual loads to small, shallow urban water bodies were assessed and found to be ~50, 130, 130 (the N-fixation contributes to the atmospheric deposition inputs especially during the spring), and 80% of TOC, TN, N-NH4+, and TP, respectively, representing nutrients transferred into the water phase. The maximum primary production (evaluated as Chl-a) stock resulting in a 2-m-deep water column from the above inputs ranged from 2.54–7.98 mg Chl-a m−3. As a continuous source of nutrients, atmospheric deposition should not be underestimated as a driving force for urban water body eutrophication, and it potentially influences primary production, especially during the optimal algae growth period.

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Section: Water Quality Maintenance Hab Early Warning and Emergency Mmentioning

confidence: 97%

Characteristics of Atmospheric Deposition during the Period of Algal Bloom Formation in Urban Water Bodies

et al. 2019

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“…Also in this case the interest concentrates on identification of the least expensive harvesting of algae. In [33] is discussed separation from urban landscape water using a high density microbubble layer enhanced by micro-flocculation.…”

Section: Separation Techniquesmentioning

confidence: 99%

What can be done with microbubbles generated by a fluidic oscillator? (survey)

Tesař

2017

EPJ Web Conf.

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Abstract.Recently discovered possibility of generating sub-millimetre bubbles by means of pulsating the inlet gas flow by a fluidic oscillator has opened a way to many interesting and advantageous engineering applications. Some of them have been known before, but were too inefficient and nearly forgotten. Now they deserve discussing in the new perspective. Other, applications, new ones, appear now in literature at a rapid pace. This paper, by providing a survey of already existing possibilities and advantages, aims at providing the readers an inspiration for their own developments.

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“…The first is to remove algae using various physical and chemical methods including a waterwheel, chemical reagent, red clay, and ultrasonic waves. The other is to eliminate N and P elements causing eutrophication by several methods, such as the chemical coagulation and precipitation [13][14][15][16][17][18][19][20][21]. Even though various possible methods to treat eutrophication or eliminate algae have been suggested, due to some challenges in cost or efficiency, no best method has been proposed until now.…”

Section: Introductionmentioning

confidence: 99%

Effect by Alkaline Flocculation of Algae and Phosphorous from Water Using a Calcined Waste Oyster Shell

Nam

Choi²,

Lee

et al. 2017

Water

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Alkaline flocculation has been considered as a potential candidate to remove algae and eutrophic substances from water. A number of researches using low-cost and environmentally friendly methods have been suggested to optimize removal efficiency. In this study, a calcium-containing waste oyster shell, as an environmentally friendly substance, has been used to treat phosphorous, a eutrophic substance, and to remove algae from the fresh water simultaneously. The X-ray Fluorescence (XRF) analysis showed that CaO was a major phase in a raw oyster shell, which played an important role for flocculation of phosphorous as well as algae. In order to eliminate the algae or phosphorous effectively, oyster shell was calcined at 1000 • C and hydrated in water. The slurry of hydrated calcined oyster shell, from 5 g/L to 12.5 g/L, was utilized in this experiment, where the experimental results were compared with that of dolomite. A series of experimental investigations, such as pH and turbidity changes using the water quality analyzer and UV-Visible spectroscopy (UV-Vis), demonstrated that the algae were efficiently removed. In addition, total phosphorous (TP) and total nitrogen (TN) analyses at different amounts of slurries of the hydrated calcined oyster shell showed that almost all the phosphorous was removed at 7.5 g/L of hydrated oyster shell, but due to the high solubility of nitrogen compounds, no obvious effect for the removal of nitrogen was observed. Furthermore, powder X-ray diffractions (PXRD) showed that Ca(OH) 2 compounds were transformed to the phosphate compound, suggesting that the oyster shell caused flocculation by chemically forming with phosphorous ions.

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Algae separation from urban landscape water using a high density microbubble layer enhanced by micro-flocculation

Cited by 5 publications

References 0 publications

Characteristics of Atmospheric Deposition during the Period of Algal Bloom Formation in Urban Water Bodies

Characteristics of Atmospheric Deposition during the Period of Algal Bloom Formation in Urban Water Bodies

What can be done with microbubbles generated by a fluidic oscillator? (survey)

Effect by Alkaline Flocculation of Algae and Phosphorous from Water Using a Calcined Waste Oyster Shell

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