Ecotoxicological assessment of flocculant modified soil for lake restoration using an integrated biotic toxicity index

Wang, Zhibin; Zhang, Honggang; Pan, Gang

doi:10.1016/j.watres.2015.08.033

Cited by 31 publications

(24 citation statements)

References 51 publications

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“…Although flocculants or modifiers could have detrimental impacts, the combined used has been shown to reduce the clay loading resulting in overall lower environmental impact (Wang et al . ,b). Notwithstanding, application methods should be carefully considered as cultured fish could be sensitive to these substances.…”

Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

“…The operation principle is similar to Phoslock ® , but with the advantage to use local soil supplemented with a biopolymer as chitosan (Wang et al . ,b). In China, its implementation in the natural environment at mesocosm scale showed a change in microplankton community, with an increase in diversity (multi‐algae coexistence) together with a decrease of nutrients in the water column and diminished release of nutrients from the sediments (Dai et al .…”

Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

“…At larger scale in the same lake, the impact was similar, showing restoration of submerged vegetation (Macrophyte) suggesting that nutrient limitation can be manipulated using the MLS technology and secondarily that ecological recovery can be promoted (Wang et al . ,b). However, successful manipulation of biogeochemical processes requires a comprehensive understanding of physical, chemical and biological conditions, which could lead to contrasting results (Spears et al .…”

Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

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A critical review on control methods for harmful algal blooms

Gallardo

Astuya-Villalón

Llanos-Rivera

et al. 2018

Reviews in Aquaculture

104

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The impacts of harmful algal blooms on human health, tourism, fisheries and ecosystems have increased in recent decades. Eutrophication and the feared climate change are believed to further challenge authorities and those whose activity depends on coastal resources. While in most of the affected countries, regulatory steps have been taken to protect consumers of contaminated food, there has been an unequal focus on management systems. Some countries such as EEUU and Canada have focused on monitoring and prediction programs, whereas others (e.g. Korea, China) have relied on direct control of blooms in the sea. Here, we review current control methods for HABs including their fundamentals and the last scientific advances. A thorough revision of all considered approaches so far has been included. Ecological studies of the impact of the countermeasures were also considered.

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Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

Section: Chemical and Physical–chemical Methodsmentioning

confidence: 99%

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A critical review on control methods for harmful algal blooms

Gallardo

Astuya-Villalón

Llanos-Rivera

et al. 2018

Reviews in Aquaculture

104

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“…The biodegradability and the flocculation effect of CS make it possible to be used at low dosage together with soil particles for natural bloom water treatment. When combined with soil particles, the biotic toxicity of cationic starch can be significantly reduced, which was specifically studied in another study (Wang et al, 2016). However, the longterm effect on aquatic ecological system even at low dosage is unclear.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Removal of Microcystis aeruginosa using cationic starch modified soils

et al. 2016

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a b s t r a c tA cheap and biodegradable modifier, cationic starch (CS), was used to turn local soils into effective flocculants for Microcystis aeruginosa (M. aeruginosa) removal. The isoelectric point of soil particles was remarkably increased from pH 0.5 to 11.8 after modification with CS, which made CS modified soil particles positively charged and obtain algal flocculation ability. At the soil concentration of 100 mg/L, when the CS modifier was 10 mg/L, 86% of M. aeruginosa cells were removed within 30 min. Lower or higher CS dosage led to limited algal removal. About 71% and 45% of M. aeruginosa cells were removed within 30 min when CS was 5 mg/L and 80 mg/L, respectively. This is because only part of algal cells combined with CS modified soil particles through charge neutralization at low dosage, while flocs formed at high CS dosage were positively charged which prevents further aggregation among the flocs. The floc stability was quantified by a floc breakage index under applied shear force. Algal flocs formed at acid and alkaline conditions were more prone to be broken than those at the neutral condition. The cost and biodegradability concerns may be largely reduced through the use of CS modified local soils. For field applications, other practical issues (e.g., re-suspension) should be further studied by jointly using other methods.

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“…8a and 9a). The flocculation and sedimentation after MLS treatment may largely inhibit the division and proliferation of algae cells (Li and Pan, 2013;Wang et al, 2016). In the mid-term (Mar.…”

Section: Nutrient Threshold Of Phytoplankton Growthmentioning

confidence: 99%

Manipulating nutrient limitation using modified local soils: A case study at Lake Taihu (China)

et al. 2016

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a b s t r a c tThe effect of geo-engineering materials of chitosan modified local soil (MLS) on nutrient limitation was studied in comparable whole ponds in Lake Taihu in October 2013. After 20 kg MLS were sprayed in the whole water pond (400 m 2 ), the chlorophyll-a (Chl-a) concentration was decreased from 42 to 18 mg L À1 within 2 h and remained below 20 mg L À1 in the following 15 months, while the average Chl-a was 36 mg L À1 in the control pond throughout the experiment. In situ nutrient addition bioassay experiments indicated that the nutrient limitation was shifted from nitrogen (N) and phosphorus (P) co-limitation to P limitation after MLS treatment from October 2013 to March 2014 compared to the control pond. In the cyanobacterial bloom season of June 2014, N and P co-limitation remained and N was the primary limiting nutrient and P was a secondary one in the control pond where phytoplankton biomass showed significant increase by N addition and further increase by N þ P additions, while both N and P became the limiting nutrient for phytoplankton growth where only combined N and P additions showed significant Chl-a stimulation in the treatment pond. In the next summer (June 2014), a cyanobacteria-dominated state still remained in the control pond but chlorophytes, bacillariophytes and cyanophytes distributed equally and submerged vegetation was largely restored in the treatment pond. Meanwhile, the upper limiting concentration of DIN was enhanced from 0.8 to 1.5 mg L À1 and SRP from 0.1 to 0.3 mg L À1 compared to the control pond. This study indicates that nutrient limitation can be manipulated by using MLS technology.

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Ecotoxicological assessment of flocculant modified soil for lake restoration using an integrated biotic toxicity index

Cited by 31 publications

References 51 publications

A critical review on control methods for harmful algal blooms

A critical review on control methods for harmful algal blooms

Removal of Microcystis aeruginosa using cationic starch modified soils

Manipulating nutrient limitation using modified local soils: A case study at Lake Taihu (China)

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