Seasonal Characterisation and Trends Study of Nutrient Concentrations in Surface Water from Catchments with Intensive Livestock Farming

Bērziņa, Laima; Sudars, Ritvars

doi:10.2478/v10145-010-0029-0

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…The overall mean value of DP concentration is 0·32 mg l −1 for the sampling points located on the four rivers. This average concentration is greater than 0·15 mg l −1 set for European rivers (Berzina and Sudars ) and very much greater than 0·02 mg l −1 set by USEPA () to avoid eutrophication during the growing seasons.…”

Section: Discussionmentioning

confidence: 62%

Spatial and Temporal Trends of Recent Dissolved Phosphorus Concentrations in Lake Tana and its Four Main Tributaries

Alemu

Geset

Mosa³

et al. 2017

Land Degrad Dev

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Rapid population growth and agricultural intensification have been directly associated with land degradation and with visible deterioration in water quality in the Ethiopian lakes. Assessing the extent and origin of pollution is cumbersome because of the lack of measurements for water quality parameters. This paper reports on the dissolved phosphorus (DP) concentrations in Lake Tana and its tributaries during 3 years from 2010 to 2012 and the four rainy months in 2014. Concentrations in the headwaters, at the gaging station, at the river mouth, near shore (littoral), and in the open lake (pelagic) were measured for the four major rivers. DP concentration in the rivers was on the average 0·32 mg l−1, and DP in the lake was much lower with an average concentration of 0·10 mg l−1. Temporally, DP concentrations were greater in the rainy phase of the monsoon than in the dry phase from November through March. Moreover, an upward trend in DP concentrations is coinciding with the area expansion of water hyacinths in the lake. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 62%

Spatial and Temporal Trends of Recent Dissolved Phosphorus Concentrations in Lake Tana and its Four Main Tributaries

Alemu

Geset

Mosa³

et al. 2017

Land Degrad Dev

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“…The TP concentrations in the Lake near Gumara, Rib and Gilgel Abay of 1.7 mg P/l (Table 4) were 30 times the lake water quality standard of the United States Environmental Protection Agency recommended level in streams entering lakes or reservoirs of 0.05 mg•P l −1 (USEPA US Environmental Protection Agency, 1986Agency, , 2000 and was 10 times the European standard (Berzina and Sudars, 2010). The average TP lake concentrations were 1.1 mg P/l in 2019 and an order of magnitude greater than the USEPA standard.…”

Section: Lake Water Qualitymentioning

confidence: 81%

Water Quality Characteristics of a Water Hyacinth Infested Tropical Highland Lake: Lake Tana, Ethiopia

Dersseh

Steenhuis

Kibret³

et al. 2022

Front. Water

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Nutrient enrichment from increased anthropogenic activities causes algal blooms and the proliferation of water hyacinth and other aquatic weeds. It is a recent phenomenon in developing nations where the link between water quality and water hyacinth infestation is not well studied. The objective of this study is to investigate the relationship between phosphorus, nitrogen, and chlorophyll-a on the distribution of water hyacinths in Lake Tana, located in the tropical highlands of Ethiopia. In this 3,000 km2 lake, water hyacinths have expanded from almost none to 25 km2 during the last 10 years. Water samples were taken near the four large rivers and at 27 nearshore stations. Samples were analyzed for total phosphorus, total nitrogen and chlorophyll-a. Our measurements were augmented with concentrations reported in the literature historically. Our results show that phosphorus concentration increased exponentially since the first measurements in 2003 from 0.01 mg P/l to near 1.8 mg P/l in 2020. Nitrogen concentrations increased from near zero at the end of the dry phase but remained nearly constant at around 2 mg total N/l after 2016. As a result, the ratio of nitrogen and phosphorus decreased in time, and the lake went from phosphorus to nitrogen limiting. Chlorophyll-a concentrations ranged from 0.3 to 104 μg/l. Water hyacinths appeared in the lake around 2010 after the nitrogen assimilation capacity of the lake was exceeded. They are found mainly in the northeastern part of Lake Tana, while nutrient concentrations are suitable for growing water hyacinths throughout the lake after 2010. Its location is mainly a consequence of lake circulation and wind direction. Minimum Chl-a concentrations were measured at locations with water hyacinths. Preventing future expansion of water hyacinth in Lake Tana is complicated but will require at minimum management practices that reduce the nitrogen and phosphorus loading from fertilizers applied in agriculture and prevent contributions from point sources.

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“…Dānija, Somija, Zviedrija, Baltijas valstis, Polija, Krievija, Baltkrievija un Vācija ir atbildīgas par piesārņojuma līmeni Baltijas jūrā, jo ir izvietotas Baltijas jūras sateces baseinā (2000/60/EC, 2000). Piesārņojošās vielas jūrā nonāk no lauksaimniecības zemēm un nosusināšanas sistēmām (Berzina & Sudars, 2010), neattīrītiem vai nepietiekami attīrītiem pilsētu sadzīves kanalizācijas sistēmu ūdeņiem, piesārņotu rūpniecības notekūdeņu veidā un pat lietus notekūdeņu veidā (European Commission 91/271/EEC, 1991), jo tie satur putekļus un nesadegušus naftas produktus no autoceļiem un automašīnu stāvvietām (Jansons & Grinberga, 2012).…”

Section: Tabulu Sarakstsunclassified

“…Novērtēt piesārņojošo vielu samazināšanas efektivitāti divu dažādu tipu mākslīgajos mitrājos, ņemot vērā nozīmīgākos mitrāju darbību ietekmējošos ģeogrāfiskos un fizikālos faktorus. 4.…”

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Ūdeņu kvalitātes uzlabošanas efektivitāte un risinājumi mākslīgajos mitrājos Latvijā = The Efficiency and Solutionsfor Water Quality Improvementin Constructed Wetlands in Latvia

Grinberga¹

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Grinberga L. The Efficiency and Solutions for Water Quality Improvement in Constructed Wetlands in Latvia: dissertation to receive scientiffic doctoral degree (Ph. D.). Jelgava, Latvia University of Life Sciences and Technologies, 2022. 118 p, 72 pictures, 6 tables, 96 inform. souces. The dissertation prepared by Linda Grinberga “The Efficiency and Solutions for Water Quality Improvement in Constructed Wetlands in Latvia” is based on the topicality to examine the environmentally oriented and nature-based biological method for water quality improvement. Constructed wetlands are well known in different countries and include widely used method for water treatment, but in Latvia wetlands haven`t been proved as surely effective. Constructed wetlands are the wastewater treatment method based on physical, biological and biochemical processes and doesn’t require electricity. The first chapter of the dissertation provides an overview of the possibilities of using constructed wetlands in treating different types of wastewater. Various constructive solutions of wetlands are provided according to the conditions and needs in Latvia. The research is based on the data from two objects in study site Mezaciruli, were two separate constructed wetlands were designed, built and operated, and one monitoring object with constructed wetland in the study site Zante. All the information of the study sites, monitoring data and methods are described in the second chapter of the dissertation. In the chapter of results and discussion the efficiency of nutrient removal in study sites is analysed and the impact of climate, maintenance and conditions of Latvia on the removal efficiency is investigated. The average reduction of concentrations of ammonia nitrogen, nitrate nitrogen and total nitrogen was observed by 17%, 67% and 54%, respectively, in the subsurface flow constructed wetland. During the study period in the surface flow constructed wetland in Mezaciruli the average concentrations of nitrate nitrogen, ammonia nitrogen and total nitrogen were reduced by 10%, 24% and 9%, respectively. The median and average concentrations of nitrogen compounds showed an increase in the surface flow constructed wetland in Zante. The average concentrations of orthophosphate phosphorous and total phosphorus were reduced by 67% and 72% in the subsurface flow constructed wetland, and decreases by 5% to 27% in the surface flow wetlands in Mezaciruli, and with no changes in Zante. The concentrations of suspended solids were reduced on average by 62% at the subsurface flow wetland and by 11% at the surface flow constructed wetland in Mezaciruli, and by 8% in Zante. The median value for biochemical oxygen demand and chemical oxygen demand concentrations decreased by 91% and 83%, respectively. Based on the efficiency of constructed wetlands observed during this study at the monitoring sites, the methodology for calculations of the dimensions of constructed wetlands has been approbated and a calculation algorithm model for dimensions has been developed. The aim of the study Based on the empirical observations at the study sites, to approbate the technical solutions and develop dimensioning methodology of constructed wetlands in Latvia in order to reduce water pollution caused by economic activities. Research objectives 1. To evaluate the possibilities of application of different design constructed wetlands in Latvia according to origin, composition and volume of various wastewaters. 2. To determine and analyse the reduction of pollutants including nitrogen and phosphorus compounds, suspended solids, biochemical and chemical oxygen demand after wastewater treatment in constructed wetland. 3. To evaluate the efficiency of pollutant reduction in two different types of constructed wetlands considering the most significant geographical and physical influencing factors 4. To develop and apply a calculation methodology and tool for the constructed wetlands to improve the quality of different types, volume and content of wastewater. Research hypotheses Properly designed and dimensioned constructed wetlands improve water quality by reducing the concentrations of one or several pollutants in the water. Key words: Constructed wetland, wastewater treatment, water quality.

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Seasonal Characterisation and Trends Study of Nutrient Concentrations in Surface Water from Catchments with Intensive Livestock Farming

Cited by 4 publications

References 4 publications

Spatial and Temporal Trends of Recent Dissolved Phosphorus Concentrations in Lake Tana and its Four Main Tributaries

Spatial and Temporal Trends of Recent Dissolved Phosphorus Concentrations in Lake Tana and its Four Main Tributaries

Water Quality Characteristics of a Water Hyacinth Infested Tropical Highland Lake: Lake Tana, Ethiopia

Ūdeņu kvalitātes uzlabošanas efektivitāte un risinājumi mākslīgajos mitrājos Latvijā = The Efficiency and Solutionsfor Water Quality Improvementin Constructed Wetlands in Latvia

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