Lakes restoration approaches

Alhamarna, Mohammed Z.; Tandyrak, Renata

doi:10.2478/limre-2021-0010

Cited by 10 publications

(8 citation statements)

References 78 publications

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“…In the case of shallow lakes, selecting the optimal restoration method is very difficult due to the strong coupling between sediments and water [40,41]. According to literature data [42][43][44], restoration methods dedicated mainly to shallow, polymictic lakes include flushing, removal of bottom sediments, isolation of bottom sediments, biomanipulation, and phosphorus inactivation. The optimal solution for Lake Mielenko was the phosphorus inactivation method with an innovative solution consisting of the sequential application of two types of coagulants, i.e., iron (PIX 111) and aluminum (PAX 18).…”

Section: Discussionmentioning

confidence: 99%

Sequential Application of Different Types of Coagulants as an Innovative Method of Phosphorus Inactivation, on the Example of Lake Mielenko, Poland

Grochowska,

Łopata,

Augustyniak-Tunowska

et al. 2023

Sustainability

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The process of accelerated eutrophication forces the search for innovative, effective methods to restore the quality of surface waters. This study was conducted on shallow, urban Lake Mielenko (Maximum depth 1.9 m; Mean depth 1.3 m) in the context of implementing a new, sustainable method of lake restoration, i.e., phosphorus inactivation by sequential application of two types of coagulants. Approximately 9.9 tons of polyaluminium chloride (trade name PAX 18) were introduced into the profundal zone of Lake Mielenko, and 9.0 tons of iron chloride (trade name PIX 111) in the coastal area. The applications were divided into two spring and two autumn stages. Before restoration, the mean Pmin. concentration in Lake Mielenko water was 0.031 mg P/L, and TP was in the range of 0.091 to 0.346 mg P/L. After restoration, the average content of Pmin. was 0.007 mg P/L (a decrease of 80%), and the average value of TP was 0.096 mg P/L (a decrease of 72%). The obtained results indicate that phosphorus inactivation does not change nitrogen compounds’ content. However, due to the application of coagulants, P content decreased, i.e., the main factor limiting photosynthesis, which resulted in a significant decrease in primary production in Lake Mielenko. Before restoration, the average content of N-NH4 was 0.100 mg N/L, N-NO3—0.145 mg N/L, Norg. 1.70 mg N/L, and TN—1.86 mg N/L. After restoration, the average content of N-NH4 was 0.096 mg N/L, N-NO3—0.123 mg N/L, Norg. 1.28 mg N/L, and TN—1.50 mg N/L. This also resulted in a reduction in the Norg. content, as well as a reduction in the amount of chlorophyll a (from 30.51 to 13.41 mg/m3), organic compounds (BOD5 from 8.9 to 4.6 mg O2/L), and an increase in water transparency to the bottom (up to 1.45 m on average). The results obtained in Lake Mielenko indicate that the innovative method of phosphorus inactivation, which involves the sequential application of two types of phosphorus-binding preparations, is an excellent solution that ensures higher ecological safety in the coastal areas of the reservoir and also allows for a significant reduction in restoration costs.

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Section: Discussionmentioning

confidence: 99%

Sequential Application of Different Types of Coagulants as an Innovative Method of Phosphorus Inactivation, on the Example of Lake Mielenko, Poland

Grochowska,

Łopata,

Augustyniak-Tunowska

et al. 2023

Sustainability

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“…Among the ichthyofauna, there is the common bream (Abramis brama), crucian carp (Carassius), perch (Perca fluviatilis), common roach (Rutilus rutilus), pike (Esox lucius), crayfish (Astacidea) (Ozero Tuchne, 2023). The experience of assessing the impact of sapropel extraction on lake ecosystems of various types and research on the processes of restoring their functioning after the completion of such a procedure (Shevchuk, 1996;Baksiene, 2015;Alhamarna & Tandyrak, 2021) give reason to be optimistic about the future of lakes suitable for sapropel extraction.…”

Section: Methodsmentioning

confidence: 99%

“…Sometimes dredging work has short-term positive effects on the lake ecosystem (Jing et al, 2019). Therefore, concerning the restoration of lakes, most researchers support complex methods and technologies, including the mechanical extraction of sapropel sediments (Klapper, 2003;Alhamarna & Tandyrak, 2021;Sellergren et al, 2023). There is also growing interest in the use of sapropel resources in medicine, including cosmetology and peloid therapy 2022) deal with the geo-ecological aspects of the bottom sediments of lakes, in particular the accumulation and migration of heavy metals in lake sapropel, to the assessment of the impact of anthropogenic factors on lake sediments.…”

Section: Introductionmentioning

confidence: 99%

The geoecological analysis of Lake Tuchne (Volyn Polissia) and assessment of sapropel reserves in it

Martyniuk,

Kovalchuk,

Zubkovych

et al. 2024

Journ. Geol., Geogr., and Geoec..

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The administrative-territorial reform in Ukraine, which began in 2015, opened up prospects for newly created territorial communities to determine the resource potential of local territories under control and develop strategies for balanced nature use and their progressive development. The lakes, which have a significant potential for sapropel resources, take an important place in the Polissia region of Ukraine. Given the above, there is a need for a comprehensive study of specific lakes and justification of recommendations for the rational use and protection of their water and sapropel resources. The object of our research is Lake Tuchne, Volyn Polissia. The catchment area of Lake Tuchne is 10.05 km2, and the reservoir itself is 0.39 km2. A bathymetric model of the lake was built with a depth interval of 0.5 m. The vegetation index (NDVI) for the reservoir over the past five years has been varying from -0.53 (12/02/2021) to +0.48 (07/15/2021). The research presents a stratigraphic section of the reservoir sediments. The area of accumulated sapropel is 20.5 hectares, the average thickness is 4.46 m, and the maximum is 10.0 m. The ash content of sapropel varies within 17.5-37.5% (on dry substance). The content of Fe2O3 in the core ranges from 2.53% to 7.26%. The distribution of CaO compounds in the samples ranges from 2.09 to 8.12%. The CO2 content varies from 1.97 to 9.72%. The concentration of Р2О5 in sapropel samples is 0.19-0.53%. The distribution of S in sapropel deposits ranges from 0.23 to 1.09%. The pH (salt extract) distribution in the core samples varies from moderately alkaline (7.63) to close to neutral – 5.97. A digital landscape map of the lake was constructed with the selection of the littoral and sublittoral-profundal aqua sub-areas and five types of aquafacies. A landscape-metric analysis of the natural and aquatic complex of the lake was carried out. The potential of water resources of Tuchne lake is 827.0 thousand m3. Sapropel reserves of category A are 914,000 m3, and based on a conditional 60.0% humidity, they are 155,000 tons. The species composition of sapropel is represented by zoogenic, organo-ferrous, and organo-limestone species. The total stock of sapropel in the lake basin is 52.5% of its volume. The reservoir is promising for extracting sapropel due to its quality characteristics and hydro-technical prerequisites for operation. Mined sapropel can be used in agriculture, medicine, recreation, etc. Implementing this task will improve the geoecological state of the lake and the quality of its water resources.

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“…In contrast to natural recovery, some restoration methods, such as hydrological, mechanical, and dredging, may harm biota or have other negative effects on the environment. (Wilcox' and Whillans, 1999;Amico et al, 2004;Alhamarna and Tandyrak, 2021).…”

Section: Introductionmentioning

confidence: 99%

Biota Interactions for Ecological Assessment of a Deteriorated Coastal Lake following a Brief Period of Restoration

Mitwally

Rashidy

Montagna

2023

Preprint

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The coastal lake, Maruit, was one of the most productive coastal ecosystems in Egypt until the 1960s. It experienced long-term deterioration due to continuous discharge of pollutants from Alexandria city into its basins. The Egyptian government started a restoration program in 2010 to divert pollution sources away from the lake. Samples were collected in November 2012 to assess the biological condition of Lake Maruit using parasitism and predation as biological linkages between pelagic and benthic communities. A preliminary survey of ectoparasites infesting tilapia fish was carried out during this study. Ectoparasites that were retained from 300 sampled tilapia fish were identified. Two groups of platyhelminth ectoparasites, Monogenea, Cichlidogyrus sp., and the parasitic-copepod, Ergasilus lizae, were detected. Ectoparasite Platyhelminthes infected the fish Oreochromis niloticus and O. aureus, whereas the crustacean parasitized Coptodon zillii. The parasitic prevalence was 15% and 3% for Cichlidogyrus sp., and Ergasilus lizae, respectively. Benthic biotas were similar among basins, which could indicate successful restoration. The lack of response of fish abundance to benthic biotic components indicates few direct trophic links. Phytoplankton and benthic microalgae were not the main fish diet. It was found that Halacaridae and fish data clustered, suggesting either Halacaridae are simply responding like fish or that fish are preying on them because they have a relatively large size. Unexpectedly, linear connections between the populations of biota and the parasite-infected fish were found, suggesting that parasites may control the behavior of their hosts. Organic matter concentration was the main driver of the lake ecosystem biota. While the low parasitism rate and lack of eutrophication is evidence of recovery, the low biota abundance, lack of fish and faunal diversity, and limited linkage among food web components indicate the restoration was incomplete or Lake Maruit was still suffering from degradation in 2012.

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Lakes restoration approaches

Cited by 10 publications

References 78 publications

Sequential Application of Different Types of Coagulants as an Innovative Method of Phosphorus Inactivation, on the Example of Lake Mielenko, Poland

Sequential Application of Different Types of Coagulants as an Innovative Method of Phosphorus Inactivation, on the Example of Lake Mielenko, Poland

The geoecological analysis of Lake Tuchne (Volyn Polissia) and assessment of sapropel reserves in it

Biota Interactions for Ecological Assessment of a Deteriorated Coastal Lake following a Brief Period of Restoration

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