RECOGNITION OF AN IMPORTANT WATER QUALITY ISSUE AT ZOOS: PREVALENCE AND POTENTIAL THREAT OF TOXIC CYANOBACTERIA

2014 ◽  
Vol 45 (1) ◽  
pp. 165-168 ◽  
Author(s):  
Enrique Doster ◽  
Michael F. Chislock ◽  
John F. Roberts ◽  
Jack J. Kottwitz ◽  
Alan E. Wilson
Keyword(s):  
Water Quality ◽  
Potential Threat ◽  
Quality Issue ◽  
Toxic Cyanobacteria ◽  
Water Quality Issue

scholarly journals Building partnerships

2017 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Richard Byrne
Keyword(s):  
Water Quality ◽  
Landscape Conservation ◽  
Sustainable Change ◽  
North West ◽  
The North ◽  
Quality Issue ◽  
The United Kingdom ◽  
Peat Deposits ◽  
The Uk ◽  
Water Quality Issue

Water is generally plentiful in the United Kingdom; however, there is an emerging water quality issue driven by agricultural intensification. Poor land management over generations has contributed to the degradation of upland peat deposits leading to discolouration of potable water and the loss of valuable habitats. Employing agri-environmental schemes operated by the UK Government and private Capital One water company in the North West of England is achieving water quality gains as well as landscape, conservation and habitat benefit at the same time as supporting tenant farm incomes. We describe the pressures on the uplands and how innovative partnerships are achieving sustainable change.

scholarly journals Perceptions of Local Communities on Water Quality in Pagbanganan River, Baybay City, Leyte

2013 ◽  
Vol 10 (1) ◽  
pp. 98-120 ◽  
Author(s):  
Eunice Kenee Labonite ◽  
◽  
Moises Neil Seriño ◽  
Beatriz Belonias ◽  
◽  
...  
Keyword(s):  
Water Quality ◽  
Public Awareness ◽  
River System ◽  
Biological Resources ◽  
Quality Issue ◽  
The People ◽  
The Many ◽  
The City ◽  
Superstitious Beliefs ◽  
Water Quality Issue

Pagbanganan River is a river system that traverses several barangays in the city of Baybay. The river is important to the communities because of its various ecological uses. At this time, however, it is facing major threats which affect its water quality. This study was conducted to find out how the people living near the river utilize the water resources and to determine some economically important biological resources derived from the river. River-related problems, tradtional practices, superstitious beliefs and their perception on water quality were assessed. Personal interviews were conducted to gather data on household charateristics, water usage and assessment of water quality. The communities residing near the river for food and other services. Fish, shrimps, crabs and snails are among the many biological resources derived from the river. Most residents considered the river as important to them. Respondents generally believed that the river's water quality has been slowly deterioration. Overall findings suggest the need to raise public awareness on water quality issue to increase people's understanding and encourage them to adopt practices that can sustain the river's health.

Eutrophication—A Worldwide Water Quality Issue

2021 ◽  
pp. 1-21
Author(s):  
Vasileios C. Kapsalis ◽  
Ioannis K. Kalavrouziotis
Keyword(s):  
Water Quality ◽  
Quality Issue ◽  
Water Quality Issue

scholarly journals Construction, Operation And Evaluation Of A Compact Upright Bioreactor For The Elimination Of Nutrients (CUBEN)

2021 ◽  
Author(s):  
Maryam Reza
Keyword(s):  
Phosphorus Removal ◽  
Nitrate Removal ◽  
Biological Nutrient Removal ◽  
Economic Losses ◽  
Removal Process ◽  
Quality Issue ◽  
Property Price ◽  
Removal Processes ◽  
Construction Operation ◽  
Water Quality Issue

Eutrophication is reported as the most important water quality issue around the world. The potential death of Lake Winnipeg, the world's ninth largest lake, is a dramatic exampe of this ecological disater in Canda. Property price devaluation, tourist repulsion, and toxicity due to eutrophication cause the annual economic losses over $3 billion in Europe, South and North America. The objective of this thesis is to develop an efficient biological nutrient removal reactor to be commercialized and used in the water/wastewater treatment industry. This bioreactor has a unique configuration which is filed as a US patent technology called "Compact Upright Bioreactor for the Elimination of Nutrients", invented by M. Alvarez Cuenca and M. Reza. It consists of four stages including Deaeration, Anoxic, Anaerobic and Aerobic where Do removal, denitrification and phosphorus removal processes take place respectively. The bioreactor performs very well obtaining 100% Do removal and 98% nitrate removal efficiency. The phosphorus removal process requires much longer operational period to reach steady state. The phosphorus removal process shows variable results having a maximum of 60% removal success.

scholarly journals Decline in Transparency of Lake Hongze from Long-Term MODIS Observations: Possible Causes and Potential Significance

2019 ◽  
Vol 11 (2) ◽  
pp. 177 ◽  
Author(s):  
Na Li ◽  
Kun Shi ◽  
Yunlin Zhang ◽  
Zhijun Gong ◽  
Kai Peng ◽  
...  
Keyword(s):  
Water Quality ◽  
Aquatic Vegetation ◽  
Water Quality Monitoring ◽  
Validation Dataset ◽  
Model Parameters ◽  
Potential Significance ◽  
Important Indicator ◽  
Quality Issue ◽  
Mean Square Errors

Transparency is an important indicator of water quality and the underwater light environment and is widely measured in water quality monitoring. Decreasing transparency occurs throughout the world and has become the primary water quality issue for many freshwater and coastal marine ecosystems due to eutrophication and other human activities. Lake Hongze is the fourth largest freshwater lake in China, providing water for surrounding cities and farms but experiencing significant water quality changes. However, there are very few studies about Lake Hongze’s transparency due to the lack of long-term monitoring data for the lake. To understand long-term trends, possible causes and potential significance of the transparency in Lake Hongze, an empirical model for estimating transparency (using Secchi disk depth: SDD) based on the moderate resolution image spectroradiometer (MODIS) 645-nm data was validated using an in situ dataset. Model mean absolute percentage and root mean square errors for the validation dataset were 27.7% and RMSE = 0.082 m, respectively, which indicates that the model performs well for SDD estimation in Lake Hongze without any adjustment of model parameters. Subsequently, 1785 cloud-free images were selected for use by the validated model to estimate SDDs of Lake Hongze in 2003–2017. The long-term change of SDD of Lake Hongze showed a decreasing trend from 2007 to 2017, with an average of 0.49 m, ranging from 0.57 m in 2007 to 0.42 m in 2016 (a decrease of 26.3%), which indicates that Lake Hongze experienced increased turbidity in the past 11 years. The loss of aquatic vegetation in the northern bays may be mainly affected by decreases of SDD. Increasing total suspended matter (TSM) concentration resulting from sand mining activities may be responsible for the decreasing trend of SDD.

scholarly journals Periods of Extreme Shallow Depth Hinder but Do Not Stop Long-Term Improvements of Water Quality in Lake Apopka, Florida (USA)

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 538 ◽  
Author(s):  
Gaohua Ji ◽  
Karl Havens
Keyword(s):  
Water Quality ◽  
Eutrophic Lake ◽  
Water Levels ◽  
Shallow Depth ◽  
Benthivorous Fish ◽  
Chl A ◽  
Lake Apopka ◽  
Toxic Cyanobacteria ◽  
Long Term Trends

We recently documented that during times of extreme shallow depth, there are severe effects on the water quality of one of the largest shallow lakes in the southeastern USA—Lake Apopka. During those times, total phosphorus (TP), total nitrogen (TN), chlorophyll-a (Chl-a) and toxic cyanobacteria blooms increase, and Secchi transparency (SD) declines. The lake recovers when water levels rise in subsequent years. In this paper, we determined whether extreme shallow depth events, particularly when they re-occur frequently, can stop the long-term recovery of a shallow eutrophic lake undergoing nutrient reduction programs. Apopka is an ideal location for this case study because the State of Florida has spent over 200 million USD in order to reduce the inputs of P to the lake, to build large filter marshes to treat the water, and to remove large quantities of benthivorous fish that contribute to internal P loading. We obtained data from 1985 to 2018, a period that had relatively stable water levels for nearly 15 years, and then three successive periods of extreme shallow depth, and we examined the long-term trends in TP, TN, Chl-a, and SD. There were significant decreasing trends in all of these water quality variables, and even though water quality deteriorated during periods of extreme shallow depth, and reduced the slope of the long-term trends, it did not stop the recovery. However, in the future, if climate change leads to more frequent shallow depth events, which in lakes such as Apopka, result in the concentration of water and nutrients, it is unclear whether the resilience we document here will continue, vs. the lake not responding to further nutrient input reductions.

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