Geoengineering in lakes: welcome attraction or fatal distraction?

Mackay, Eleanor B.; Maberly, Stephen C.; Pan, Gang; Reitzel, Kasper; Bruere, Andy; Corker, Nicholas; Douglas, Grant; Egemose, Sara; Hamilton, David P.; Hatton-Ellis, Tristan; Huser, Brian; Li, Wei; Meis, Sebastian; Moss, Brian; Lürling, Miquel; Phillips, Geoff; Yasseri, Said; Spears, Bryan M.

doi:10.5268/iw-4.4.769

Cited by 79 publications

(37 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Source-oriented measures principally targeting the phosphorus inflow and internal loading remain essential in reducing eutrophication [32]. However, in situations where source-oriented measures are not easy achievable, cost-effective end-of-pipe solutions might be an alternative, but these should have proven efficacy in situ.…”

Section: Discussionmentioning

confidence: 99%

Effects of Commercially Available Ultrasound on the Zooplankton Grazer Daphnia and Consequent Water Greening in Laboratory Experiments

Lürling

Tolman

2014

Water

Self Cite

View full text Add to dashboard Cite

Abstract:We tested the hypothesis that ultrasound in controlling cyanobacteria and algal blooms is "environmental friendly" by exposing the non-target zooplankton grazer Daphnia magna to ultrasound produced by commercially available ultrasound transducers. In populations of 15 Daphnia (~2 mm body size) exposed in 800 mL of water to ultrasound supplied at 20 kHz, 28 kHz, 36 kHz or 44 kHz, all animals were killed between 10 min (44 kHz) and 135 min (20 kHz). Differently sized Daphnia (0.7-3.2 mm) were all killed between 4 and 30 min when exposed to 44 kHz. Increasing water volumes up to 3.2 L and thus lowering the ultrasound intensity did not markedly increase survival of Daphnia exposed to 44 kHz ultrasound. A tank experiment with six 85 L tanks containing a mixture of green algae, cyanobacteria and D. magna was performed to study the effect of ultrasound over a longer time period (25 d). In controls, when Daphnia flourished, algal biomass dropped and the water became clear. In contrast, in ultrasound treatments, Daphnia abundance was extremely low releasing phytoplankton from grazing control, which resulted in high phytoplankton biomass. Hence, we conclude that ultrasound from commercially available transducers sold to clear ponds, aquaria and small reservoirs, OPEN ACCESSWater 2014, 6 3248 should not be considered environmentally friendly and cannot be viewed as efficient in controlling phytoplankton.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of Commercially Available Ultrasound on the Zooplankton Grazer Daphnia and Consequent Water Greening in Laboratory Experiments

Lürling

Tolman

2014

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the demand of society and the governments for good water quality is urgent. Some countries have set compulsory goals for water quality improvement within short period of time and large amount of funds were attached (Mackay et al, 2014). In-lake measures of geo-engineering may be useful to meet this urgent need, although long term ecological safety must be taken into consideration.…”

Section: Discussionmentioning

confidence: 99%

“…Since the natural restoration processes are far slower than the time scale of these management targets, ecological safe/ effective and environmentally friendly in-lake technologies for quick control of internal nutrient loads are required. Recently, geoengineering in lakes has caused much interest for eutrophication control, which can offer the promise of rapid effects (Mackay et al, 2014;Spears et al, 2013). Some conventional geo-engineering materials, such as aluminum-/iron-salts and solid-phase P sorbents (aluminum, iron and lanthanum modified soils/clays etc.)…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The frequent outbreak of cyanobacterial blooms in eutrophic waters is a global issue, posing serious threats to aquatic ecosystem and human health Liu and Le, 2015;Lu et al, 2013;Wang et al, 2013c). Modified soils (MSs) have triggered great interest as geo-engineering materials for cyanobacterial bloom control in recent years (Lürling and van Oosterhout, 2013;Mackay et al, 2014;Spears et al, 2014;Tian et al, 2014). Although many studies on algal removal using MSs have been reported (Li and Pan, 2013;Pan et al, 2011a;Shi et al, 2015;Zou et al, 2005), little is known about its potential impacts on the receiving waters.…”

Section: Introductionmentioning

confidence: 99%

Effect of algal flocculation on dissolved organic matters using cationic starch modified soils

Shi

Pan

2016

Journal of Environmental Sciences

Self Cite

View full text Add to dashboard Cite

Modified soils (MSs) are being increasingly used as geo-engineering materials for the sedimentation removal of cyanobacterial blooms. Cationic starch (CS) has been tested as an effective soil modifier, but little is known about its potential impacts on the treated water.This study investigated dissolved organic matters in the bloom water after algal removal using cationic starch modified soils (CS-MSs). Results showed that the dissolved organic carbon (DOC) could be decreased by CS-MS flocculation and the use of higher charge density CS yielded a greater DOC reduction. When CS with the charge density of 0.052, 0.102 and 0.293 meq/g were used, DOC was decreased from 3.4 to 3.0, 2.3 and 1.7 mg/L, respectively.The excitation-emission matrix fluorescence spectroscopy and UV 254 analysis indicated that CS-MS exhibits an ability to remove some soluble organics, which contributed to the DOC reduction. However, the use of low charge density CS posed a potential risk of DOC increase due to the high CS loading for effective algal removal. When CS with the charge density of 0.044 meq/g was used, DOC was increased from 3.4 to 3.9 mg/L. This study suggested, when CS-MS is used for cyanobacterial bloom removal, the content of dissolved organic matters in the treated water can be controlled by optimizing the charge density of CS. For the settled organic matters, other measures (e.g., capping treatments using oxygen loaded materials) should be jointly applied after algal flocculation.

show abstract

Geoengineering in lakes: welcome attraction or fatal distraction?

Cited by 79 publications

References 49 publications

Effects of Commercially Available Ultrasound on the Zooplankton Grazer Daphnia and Consequent Water Greening in Laboratory Experiments

Effects of Commercially Available Ultrasound on the Zooplankton Grazer Daphnia and Consequent Water Greening in Laboratory Experiments

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

Effect of algal flocculation on dissolved organic matters using cationic starch modified soils

Contact Info

Product

Resources

About