Improving the performance of shipboard rotary drum filters in the removal of cyanobacterial blooms by cationic polyacrylamide flocculation

Wang, Chunbo; Cai, Qijia; Feng, Bing; Feng, Shouhua; Tian, Cuicui; Jiang, Xiaoming; Wu, Xingqiang; Xiao, Baihua

doi:10.1016/j.seppur.2019.01.009

Cited by 30 publications

(14 citation statements)

References 35 publications

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“…Flocculation is a low-cost method that is commonly used in wastewater treatment. Flocculation is often combined with other steps, such as filtration or dissolved air flotation for microalgal biomass harvesting (Branyikova et al, 2018;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The charge of the polymer can also impact the effectiveness of the flocculation (e.g. higher cationic degree leads to better flocculation) (Wang et al, 2019). Changes in operating conditions can have an effect on the optimal dosage or final flocculation efficiency of synthetic flocculants, which in turn can alter the overall cost savings that might be achieved (Fasaei et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting

Labeeuw

Commault

Kuzhiumparambil

et al. 2021

Science of The Total Environment

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting

Labeeuw

Commault

Kuzhiumparambil

et al. 2021

Science of The Total Environment

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“…Directly removing widely accumulated cyanobacteria from lakes is a simple method. For example, a combination of cationic polyacrylamide (CPAM) (1-2 mgÁL À1 ) and a shipboard rotary drum filter (RDF) with a 35 μm screen was investigated, and Chl-a concentration and turbidity in the effluent were reduced to less than 20 μgÁL À1 and 12 NTU, respectively, from Lake Dianchi (Kunming, China) (Wang et al, 2019). It should be noted that monomer acrylamide of PAM-based coagulant is neurotoxic and has been classified as a carcinogenic, mutagenic and reprotoxic compound.…”

Section: Pam Application In Lake Dianchimentioning

confidence: 99%

Coagulation as an effective method for cyanobacterial bloom control: A review

Yang,

Wang,

et al. 2024

Water Environment Research

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Eutrophication, the over‐enrichment with nutrients, for example, nitrogen and phosphorus, of ponds, reservoirs and lakes, is an urgent water quality issue. The most notorious symptom of eutrophication is a massive proliferation of cyanobacteria, which cause aquatic organism death, impair ecosystem and harm human health. The method considered to be most effective to counteract eutrophication is to reduce external nutrient inputs. However, merely controlling external nutrient load is insufficient to mitigate eutrophication. Consequently, a rapid diminishing of cyanobacterial blooms is relied on in‐lake intervention, which may encompass a great variety of different approaches. Coagulation/flocculation is the most used and important water purification unit. Since cyanobacterial cells generally carry negative charges, coagulants are added to water to neutralize the negative charges on the surface of cyanobacteria, causing them to destabilize and precipitate. Most of cyanobacteria and their metabolites can be removed simultaneously. However, when cyanobacterial density is high, sticky secretions distribute outside cells because of the small size of cyanobacteria. The sticky secretions are easily to form complex colloids with coagulants, making it difficult for cyanobacteria to destabilize and resulting in unsatisfactory treatment effects of coagulation on cyanobacteria. Therefore, various coagulants and coagulation methods were developed. In this paper, the focus is on the coagulation of cyanobacteria as a promising tool to manage eutrophication. Basic principles, applications, pros and cons of chemical, physical and biological coagulation are reviewed. In addition, the application of coagulation in water treatment is discussed. It is the aim of this review article to provide a significant reference for large‐scale governance of cyanobacterial blooms.Practitioner Points Flocculation was a promising tool for controlling cyanobacteria blooms. Basic principles of four kinds of flocculation methods were elucidated. Flocculant was important in the flocculation process.

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“…The potential physical harms caused by cationic polymers were observed in all the tested trophic levels, including algal clumping, adhesion effects on Daphnia, and blocking oxygen exchange on gills. , An acute toxicity study was conducted on rainbow trout using a cationic flocculant with the ingredients of poly(dimethyldiallylammonium chloride). By the end of the 48-h exposure period, rainbow trout showed an LC 50 response of approximately 0.3 mg/L and a reduction in conventional metabolic oxygen consumption of >50%–60% .…”

Section: Biological Consequencesmentioning

confidence: 99%

Water-Soluble Synthetic Polymers: Their Environmental Emission Relevant Usage, Transport and Transformation, Persistence, and Toxicity

Wang

Zheng

Deng

et al. 2023

Environ. Sci. Technol.

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Water-soluble synthetic polymers (WSPs) are distinct from insoluble plastic particles, which are both critical components of synthetic polymers. In the history of human-made macromolecules, WSPs have consistently portrayed a crucial role and served as the ingredients of a variety of products (e.g., flocculants, thickeners, solubilizers, surfactants, etc.) commonly used in human society. However, the environmental exposures and risks of WSPs with different functions remain poorly understood. This paper provides a critical review of the usage, environmental fate, environmental persistence, and biological consequences of multiple types of WSPs in commercial and industrial production. Investigations have identified a wide market of applications and potential environmental threats of various types of WSPs, but we still lack the suitable assessment tools. The effects of physicochemical properties and environmental factors on the environmental distribution as well as the transport and transformation of WSPs are further summarized. Evidence regarding the degradation of WSPs, including mechanical, thermal, hydrolytic, photoinduced, and biological degradation is summarized, and their environmental persistence is discussed. The toxicity data show that some WSPs can cause adverse effects on aquatic species and microbial communities through intrinsic toxicity and physical hazards. This review may serve as a guide for environmental risk assessment to help develop a sustainable path for WSP management.

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Improving the performance of shipboard rotary drum filters in the removal of cyanobacterial blooms by cationic polyacrylamide flocculation

Cited by 30 publications

References 35 publications

A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting

A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting

Coagulation as an effective method for cyanobacterial bloom control: A review

Water-Soluble Synthetic Polymers: Their Environmental Emission Relevant Usage, Transport and Transformation, Persistence, and Toxicity

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