Comparison of four flocculants for removing algae in Dianchi Lake

Ma, Xiaowei; Wang, Yuanan; Feng, Shuqing; Wang, Shoubing

doi:10.1007/s12665-015-4093-4

Cited by 25 publications

(3 citation statements)

References 34 publications

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“…Alum was most effective at pH 5-9, while lime with magnesium could effectively flocculate algae at pH 10-11 (Friedman et al, 1977). Comparing the efficacy of four coagulants in removing M. aeruginosa in water from Lake Dianchi (China) yielded that alum and iron sulfate were effective in a pH range from 6 to 8, while PAC and polymeric iron sulfate (PFS) were effective in pH range of 5 to 8 (Ma et al, 2015). At pH 9, alum still removed 70% and the other three coagulants removed 78-82% of the M. aeruginosa (Ma et al, 2015).…”

Section: Figmentioning

confidence: 99%

Coagulation and precipitation of cyanobacterial blooms

Lürling

Kang

Mucci

et al. 2020

Ecological Engineering

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Eutrophication is the prime water quality issue in inland waters. Eutrophication and its key symptom, harmful cyanobacterial blooms, is expected to further increase in the future, which highlights the importance of managing the issue. The reduction of external nutrient load is crucial but might not bring fast relief to eutrophic waters due to ongoing diffuse pollution and legacy nutrients in the sediment. In this context, in-lake measures are needed to speed-up recovery. In this review, we discuss different in-lake measures based on coagulation and precipitation of cyanobacteria and/or phosphate for different lake categories (e.g., shallow or deep, mainly external or internal nutrient load, occurrence of perennial or summer blooms). In deep lakes with an external nutrient load higher than the internal load, a "Floc and Sink" method could be used in which a coagulant (e.g. aluminium salts, Al-salts; chitosan) combined with a ballast (e.g. soil, clay) removes a cyanobacterial bloom out of the water column. In case the deep lake suffers from high internal load, a phosphate (P)-fixative (e.g. lanthanum modified bentonite or Al-salts) can be used to "Lock" the legacy P, possibly combined with a coagulanta "Floc and Lock" technique. The latter approach will target both the particulate P in a bloom and the internal P load. A shallow lake that suffers from summer blooms and in which the internal load is higher than the external load, a "Lock" strategy of winter application of a P-fixative is proposed to prevent bloom development. In shallow lakes with perennial blooms, an agent to damage the cells (such as H 2 O 2 ) is required together with a coagulant and a ballast to avoid recolonization of the water column due to resuspension -a "Kill, Floc and Sink/ Lock" method. The selection of the most promising in-lake measures and materials should be based on a proper system diagnosis and tests prior to a full-scale intervention. These methods can be effective, but evidently reduction of external nutrient loads, both from point-and non-pointed sources, is an absolute necessity to restore aquatic ecosystems in a holistic sense. recyclable sediment phosphorus (P) pool (Moss, 2010). The most notorious symptom of eutrophication is a massive proliferation of cyanobacteria (Paerl et al., 2011). Blooms of cyanobacteria are viewed problematic as they may produce nasty odours, cause fish kills due to hypoxia/anoxia, and may impair ecosystem services, such as drinking water production, irrigation, recreation, aquaculture and fisheries (Paerl and Paul, 2012). Eutrophication is expected to further increase in the upcoming decades because of human population growth, intensified

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Section: Figmentioning

confidence: 99%

Coagulation and precipitation of cyanobacterial blooms

Lürling

Kang

Mucci

et al. 2020

Ecological Engineering

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“…In a research on the effects of various flocculants for algae removal in Dianchi Lake (China), a polymeric iron sulphate-based flocculant was found to be the most effective. The researchers characterized this inorganic flocculant as efficient, safe and economical (Ma et al 2015).…”

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Flocculation-based methods of microalgae removal from the eutrophic pond enrichment culture

et al. 2021

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The method of flocculation of biomass from the water depth to the bottom can be applied in case of local algae blooms. In our research, the combined application of FeCl3 and Polyethyleneoxide-based cationic flocculant was applied for the first time for the harvesting of the enrichment culture obtained from the reservoir during eutrophication. The effects of coagulant (FeCl3·6H2O), various flocculants based on polyacrylamide (PAA), polyethylenoxide (PEO) and flocculated biomass as ballast agent, dosage and sedimental time on flocculation efficiency of harvesting enrichment culture obtained from Pond Chernoistochinsky during eutrophication have been studied. The results show that the flocculation efficiency achieved about 90% after 5 min of sedimentation when adding of coagulant and flocculant mixture (FeCl3 30 mg/L + PEO based Sibfloc-718 2.5 mg/L) or flocculant with ballast agent (FeCl3 30 mg/L + Sibfloc-718 2.5 mg/L + 1,7% flocculated biomass). PAA, PEO and FeCl3·6H2O did not demonstrate a sufficient flocculation capacity with enrichment culture containing different types of microalgae.

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“…In order to report the latest researching results on lake water pollution and eutrophication, and promote the prevention and treatment of Lake water pollution, supported by the ''National Water Pollution Control and Treatment'' programme, this thematic Issue of 26 articles took Dianchi and Erhai Lakes as examples to focus on the process and mechanism of aspects such as their water quality and evolution, sediment contamination (Li et al 2015a, c;Wang et al 2015c;Xue and Lu 2015;Zhang et al 2015b), plankton (Ma et al 2015b) and algae blooms (Ma et al 2015a;Yang et al 2015), fishery industry structure and aquatic plants . It systematically analysed the pollution process, stages characteristics and major biological group changes of Dianchi and Erhai Lakes (He et al 2015a).…”

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confidence: 99%