Studies on Nile Water Quality Before and After the High Dam and its Effects on Soil Fertility

1980 ◽  
pp. 335-345 ◽  
Author(s):  
B.S. Zikri ◽  
M.S. El-Sawaby
Keyword(s):  
Water Quality ◽  
Soil Fertility ◽  
Nile Water ◽  
Before And After

scholarly journals Integrated Hydraulic Modelling, Water Quality Modelling and Habitat Assessment for Sustainable Water Management: A Case Study of the Anyang-Cheon Stream, Korea

2021 ◽  
Vol 13 (8) ◽  
pp. 4330
Author(s):  
Byungwoong Choi ◽  
Seung Se Choi
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Water Quality Index ◽  
Habitat Suitability ◽  
Quality Index ◽  
Stream Restoration ◽  
Restoration Project ◽  
Before And After ◽  
Habitat Simulation ◽  
Canadian Council

Recent ecological stream restoration projects have focused on expanding the water-friendly space of streams, promoting the health of aquatic ecosystems, and restoring various habitats, which raise the need for relevant research. Applying integrated environmental analysis, this study quantifies the change in hydraulic characteristics before and after the restoration projects through physical habitat simulation and links the results of physical impacts to estimate benefits of increase in water quality and aquatic ecosystem health due to the implementation of the project. For this, the study area is a 3.3 km long reach of the Anyang-cheon Stream, Korea. Field monitoring revealed that five fish species are dominant and sub-dominant, and account for 76% of the total fish community. To assess the change of before and after ecological stream restoration project, the River2D and Coastal Modelling System (CMS)-Flow 2D models were used for hydraulic and water quality simulations, respectively. For the habitat simulation, the HSI (Habitat Suitability Index) model was used. In addition, the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI) was used to calculate changes in water quality index and to examine changes in habitat areas with an integrated quantitative index, the methodology of Zingraff-Hamed et al. was adopted. It was found that the ecological stream restoration project significantly increased for the eco-friendly area. In addition, the changes in water quality and habitat suitability grades before the ecological river restoration project were improved to two stages and one stage, respectively. This study applied the integrated analytical framework as a policy/project assessment tool and the results of this study will be useful for the integrated water management policy.

scholarly journals Declining bacteria, lead, and sulphate, and rising pH and oxygen in the lower Mississippi River

AMBIO ◽  
2021 ◽  
Author(s):  
R. Eugene Turner
Keyword(s):  
Water Quality ◽  
Mississippi River ◽  
Pollution Abatement ◽  
National Policy ◽  
Quality Improvements ◽  
Sulfur Dioxide Emissions ◽  
Dramatic Decline ◽  
Before And After ◽  
Lower Mississippi River ◽  
The 1960S

AbstractVarious air and water pollution issues in the US were confronted in the last 60 years using national policy legislation, notably the Clean Water Act and the Clean Air Act. I examine changes in the concentrations of bacteria, oxygen, lead, and sulphate at the terminus of the Mississippi River before and after these pollution abatement efforts. Microbial concentrations increased or were stable from 1909 to 1980 but decreased about 3 orders of magnitude after the 1970s, while the average oxygen content increased. A large decline in lead concentration occurred after the 1960s, along with a less dramatic decline in sulphate concentrations. The pH of the river dropped to a low of 5.8 in 1965 as sulfur dioxide emissions peaked and averaged 8.2 in 2019 after emissions declined. Decades of efforts at a national scale created water quality improvements and are an example for addressing new and existing water quality challenges.

scholarly journals Plankton and water quality variability in an estuary before and after the shrimp farming effluents: possible impacts and regeneration

2017 ◽  
Vol 65 (3) ◽  
pp. 495-508
Author(s):  
William Bauer ◽  
Paulo Cesar Abreu ◽  
Luis Henrique Poersch
Keyword(s):  
Water Quality ◽  
Quality Parameters ◽  
Pacific White Shrimp ◽  
Shrimp Farming ◽  
Water Quality Parameters ◽  
White Shrimp ◽  
Zooplankton Abundance ◽  
Patos Lagoon ◽  
Short Period ◽  
Before And After

Abstract Water quality, chlorophyll a, phytoplankton, proto and mezo-zooplankton abundance were spatiotemporally evaluated in an estuary receiving effluents from a Pacific white shrimp Litopenaeus vannamei farm in Patos Lagoon estuary, Southern Brazil. Samples were taken before (BD) and; 1 day (1 PD) 5 days (5 PD), 10 days (10 PD), 20 days (20 PD) and 30 days (30 PD) after the effluents discharge. Some water quality parameters were affected by the effluents discharge; however, these changes were restricted to a distance of 20 m from the effluent discharge channel for a period of 5 days. The microbial community was dominated by chlorophyceae, followed by diatoms, cyanobacteria and ciliates. There was an increase in the abundance of different groups on the 1 PD sampling compared to BD. The zooplankton abundance was low in practically all sites, except for 30 PD sampling. The meso-zooplanktonic organisms were represented by copepods, mostly Acartia tonsa. Despite some effects on water quality and phytoplankton and protozooplankton abundance until 5 PD sampling, these alterations dissipated in a short period of time. We conclude that the environment quickly assimilated the effluents discharge, and the water quality parameters remained within the limits stipulated by standard guidelines.

scholarly journals PENGELOLAAN PUPUK TERPADU DALAM UPAYA MENINGKATKAN HASIL JAGUNG MANIS DAN KESUBURAN LAHAN PADA SISTEM TANAM JAJAR LEGOWO 2:1

EUGENIA ◽  
2016 ◽  
Vol 22 (1) ◽  
Author(s):  
Yefta Pamandungan ◽  
David S. Runtunuwu ◽  
Rinny Mamarimbing ◽  
Jemmy Najoan
Keyword(s):  
Soil Fertility ◽  
Sweet Corn ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Organic N ◽  
Fertilizer Management ◽  
Inorganic Fertilizers ◽  
Before And After ◽  
Planting System ◽  
Research Show

ABSTRACT This research aims to study the increase of the yields of sweet corn and soil fertility by applying integrated fertilizers management system in Jajar Legowo 2:1 planting system. The results of this research show that providing the 25% inorganic fertilizers plus 75% organic fertilizers as treatment has given better result for the yields of sweet corn than providing 100% inorganic fertilizers or 100% organic fertilizers as treatment. Chemical properties of the soil before and after the treatment of fertilizers, it is found out that the contents of C-Organic, N of soil, and K2O of the researched soil are categorized as low to very low. However, it is found out that the available content of P2O5 has increased by 4.29 ppm through the 25% inorganic fertilizers plus 75% organic fertilizers as treatment and has increased by 1.73 ppm through the 100% organic fertilizers as treatment. Keywords: integrated fertilizer management, sweet corn, jajar legowo

scholarly journals Evaluation of Physicochemical and Microbial Quality Control of Hemodialysis Machines Water in Hospitals

2021 ◽  
Vol 12 (1) ◽  
pp. 12-23
Author(s):  
Michael Abbaszadeh ◽  
Mohammad Mosaferi ◽  
Parisa Firouzi ◽  
Mohammad Ali Abedpour ◽  
Samira Sheykholeslami
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Reverse Osmosis ◽  
National Standard ◽  
Microbial Quality ◽  
Dialysis Patients ◽  
Significant Difference ◽  
Before And After ◽  
East Azerbaijan ◽  
Dialysis Water

Abstract Background and Objectives: Water quality is important for preparation of dialysis solution due to its direct relationship with blood of patients with renal failure. The aim of this study was to evaluate the chemical and microbial quality of inlet and outlet water of dialysis devices in hospitals of East Azerbaijan province. Material and Methods: This study was a descriptive-analytical study in which the water of dialysis ward of three hospitals affiliated to East Azerbaijan University of Medical Sciences was investigated. The results of physicochemical (45 cases) and microbial (163 cases) of dialysis water were extracted from the relevant archives in two stages before and after reverse osmosis treatment during 2014-2016. Independent t-test and one-way ANOVA were used for statistical analysis while extracting descriptive statistical parameters. Data analysis was done using Excel and SPSS 23 software. Results: Evaluation of the efficiency of reverse osmosis system showed that there was a significant difference between water quality, before and after the system. Except for calcium, magnesium, fluoride and nitrate, the concentrations of other cations and anions in 100% of samples were lower than the European Pharmacopoeia standard. Incoming water samples to dialysis machine in 4.9% of cases had total coliform contamination and there was no fecal coliform in any of the samples. The frequency and frequency of tests in hospitals are not observed and despite the risk of heavy metals, heavy metals tests are not performed on dialysis water for the health of dialysis patients. Conclusion: The need to develop a national standard for controlling dialysis water, testing all quality parameters of dialysis water according to standards in regular times and timeframes, informing hospital managers and environmental health experts about the importance of dialysis water quality in health and increasing life expectancy of dialysis patients is felt.

Hydrogeochemical Mechanism of the Petroleum Hydrocarbon Pollution in Karst Fissure Groundwater System

2013 ◽  
Vol 295-298 ◽  
pp. 159-163 ◽  
Author(s):  
Zhen Min Ma ◽  
Yun Yun Luo ◽  
Yun Zhi Fang ◽  
Yu Song Hou
Keyword(s):  
Water Quality ◽  
Petroleum Hydrocarbons ◽  
Petroleum Hydrocarbon ◽  
Water System ◽  
Quality Parameters ◽  
Groundwater System ◽  
Hydrocarbon Pollution ◽  
Groundwater Environment ◽  
Before And After ◽  
Fissure Water

The research of hydrogeochemical mechanism of petroleum hydrocarbon in karst fissure groundwater system is important to predict the trend of petroleum hydrocarbons and the change of groundwater environment. We take the karst fissure water system as the research object, where there is a refinery. The variation of SO42-, HCO3-, NO3-, NO2-, HS- can be used as a hydrogeochemical sign of petroleum hydrocarbon pollution by analyzing the change of water quality parameters before and after karst fissure water contaminated by petroleum hydrocarbon. It has been also analyzed systematically that hydrogeochemical mechanism including desulfurization, denigration and ion exchange happen during the pollution process in the karst fissure water system. It is pointed out that the human activities have a great impact on the groundwater and changes of environment.

scholarly journals A Pilot Study Combining Ultrafiltration with Ozonation for the Treatment of Secondary Urban Wastewater: Organic Micropollutants, Microbial Load and Biological Effects

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3458
Author(s):  
Cátia A. L. Graça ◽  
Sara Ribeirinho-Soares ◽  
Joana Abreu-Silva ◽  
Inês I. Ramos ◽  
Ana R. Ribeiro ◽  
...  
Keyword(s):  
Water Quality ◽  
Estrogenic Activity ◽  
Biological Effects ◽  
Pilot Scale ◽  
Microbial Load ◽  
Organic Micropollutants ◽  
Urban Wastewater ◽  
Limit Of Quantification ◽  
Before And After ◽  
Nematode Eggs

Ozonation followed by ultrafiltration (O3 + UF) was employed at pilot scale for the treatment of secondary urban wastewater, envisaging its safe reuse for crop irrigation. Chemical contaminants of emerging concern (CECs) and priority substances (PSs), microbial load, estrogenic activity, cell viability and cellular metabolic activity were measured before and immediately after O3 + UF treatment. The microbial load was also evaluated after one-week storage of the treated water to assess potential bacteria regrowth. Among the organic micropollutants detected, only citalopram and isoproturon were not removed below the limit of quantification. The treatment was also effective in the reduction in the bacterial loads considering current legislation in water quality for irrigation (i.e., in terms of enterobacteria and nematode eggs). However, after seven days of storage, total heterotrophs regrew to levels close to the initial, with the concomitant increase in the genes 16S rRNA and intI1. The assessment of biological effects revealed similar water quality before and after treatment, meaning that O3 + UF did not produce detectable toxic by-products. Thus, the findings of this study indicate that the wastewater treated with this technology comply with the water quality standards for irrigation, even when stored up to one week, although improvements must be made to minimise microbial overgrowth.

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