Impacts of Upstream Input and Local Pollution Loads on the Water Quality of Suzhou Creek Based on Mathematical Models

2008 ◽  
Vol 25 (4) ◽  
pp. 507-518 ◽  
Author(s):  
Zhenliang Liao ◽  
Zuxin Xu
Keyword(s):  
Water Quality ◽  
Mathematical Models ◽  
Local Pollution ◽  
Suzhou Creek ◽  
Pollution Loads

Modeling of eutrophication and strategies for improvement of water quality in reservoirs

2016 ◽  
Vol 74 (6) ◽  
pp. 1376-1385 ◽  
Author(s):  
Mojtaba Shourian ◽  
Ali Moridi ◽  
Mohammad Kaveh
Keyword(s):  
Water Quality ◽  
Thermal Regime ◽  
Thermal Stratification ◽  
Present Situation ◽  
The State ◽  
Nitrogen Loads ◽  
Quality Of Water ◽  
Pollution Loads

The purpose of this study is to survey the thermal regime and eutrophication states in Ilam reservoir in Iran as the case study. For this purpose and to find solutions for improving the water's quality in the reservoir, two general strategies for reducing the entering pollution loads and water depletions from the reservoir's outlets were analyzed by use of the CE-QUAL-W2 model. Results of the simulation of the present situation show the existence of thermal stratification during summer, which results in the qualitative stratification in the reservoir. According to the qualitative criteria, the Ilam reservoir's state is between mesotrophic and eutrophic. Results of the scenarios of reduction of the nutrients show that in the scenario of 50% reduction of the phosphorus and nitrogen loads into the reservoir, the state of the reservoir would recover from eutrophic to semi-eutrophic. Also, release of water from the reservoir during September, October and November would cause the restoration of the quality of water in the reservoir. To avoid the occurrence of critical eutrophication in the reservoir, reducing the ponding time in the reservoir by fast depletion, preventing entrance of the upstream villages' sewage and agricultural drained waters, which are sources of nitrate and phosphate contamination into the rivers, and also management of the usage of agricultural fertilizers have been suggested.

Impact of Municipal Wastewater on the Quality of the River Sava

1990 ◽  
Vol 22 (5) ◽  
pp. 275-280
Author(s):  
S. Tedeschi
Keyword(s):  
Water Quality ◽  
Oxygen Saturation ◽  
Municipal Wastewater ◽  
Treatment Process ◽  
Fish Kills ◽  
The Past ◽  
Heavy Pollution ◽  
Zagreb Area ◽  
Pollution Loads

The River Sava is very polluted in certain sections. At times, the dissolved oxygen is completely exhausted (1.0 to 3.0 mg O2/l) resulting in frequent massive fish kills. The water quality has significantly deteriorated during the past few decades, due to the industry developed in the watershed and the increased population in the area. Especially heavy pollution loads come from the greater Zagreb area (153 t BOD5/day). Treating the wastewater from Zagreb could upgrade the water quality of the Sava, and 68 to 72% oxygen saturation could be achieved even under the most unfavourable conditions. Particular attention should be given to the choice of the treatment process, due to the planned construction of multi-purpose reservoirs along the Sava.

Accounting for water quality effects of future urbanization: diffuse pollution loads estimates and control in Mantua's Lakes (Italy)

2003 ◽  
Vol 47 (7-8) ◽  
pp. 291-298 ◽  
Author(s):  
A.G. Capodaglio ◽  
A. Muraca ◽  
G. Becchi
Keyword(s):  
Water Quality ◽  
Industrial Area ◽  
Environmental Consideration ◽  
Development Plans ◽  
The 1960S ◽  
Substantial Decline ◽  
And Control ◽  
The City ◽  
Pollution Loads

The three shallow lakes of Mantua (Upper, Middle and Lower) formed by the Mincio River are today classified by Italian water authorities as sensitive areas, after, in the second half of the 20th century, the hydrologic regime of the lakes was heavily modified, and the influence of industrial activities operating in the 1960s - without much environmental consideration - created a substantial decline in the water quality of the lakes. The City of Mantua is one of the most vital industrial centers of Northern Italy, and development plans are under way, that should approximately double the extension of the urban and industrial area within the next 20 years. This paper deals with estimating the effects of the aforementioned urbanization on the future water quality of the three lakes.

scholarly journals Mathematical modeling in the Urumari micro-watershed using Streeter-Phelps mathematical models and the enhanced Do-Bod model

2020 ◽  
Vol 11 (6) ◽  
pp. 332-345
Author(s):  
Lucinewton Silva de Moura ◽  
Ruy Bessa Lopes ◽  
Joseph Simões Ribeiro ◽  
Graciene Do Socorro Taveira Fernandes ◽  
Rodolfo Maduro Almeida ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Water Quality ◽  
Mathematical Models ◽  
Surface Waters ◽  
Nonlinear Function ◽  
Absolute Deviation ◽  
Recovery Mechanism ◽  
Photosynthesis And Respiration

When a certain load of pollutants is dumped in urban surface waters, the natural hydrological parameters are altered and a consequent dispersion of a contaminant occurs. Water self-purification is a natural recovery mechanism that aims to restore the natural parameters of water quality. In the municipality of Santarém, the Urumari micro-watershed, one of the main urban streams and a tributary of the Amazon river, suffers from increasing degradation. Thus, it is necessary to systematically monitor the water quality of the micro-watershed, through mathematical modeling, in order to identify environmental impairment and propose mitigating tools that facilitate self-purification capacity. The aim of this work was to evaluate the degree of disturbance of the Urumari micro-watershed using Streeter-Phelps mathematical models and the Enhanced DO-BOD model. The software Curve Expert 1.4 was used to adjust the coefficients of the mathematical models, using the Levenberg-Marquardt nonlinear function adjustment method. The complete mathematical model of DO and BOD considered the parcels of punctual deficit, microbial BOD, nitrification, sediment demand, photosynthesis and respiration. Three coefficients of the Streeter-Phelps model and six coefficients of the Enhanced DO-BOD model were adjusted according to the experimental data of dissolved oxygen and water travel time. The mathematical models satisfactorily correlated the experimental data. The values of the correlation coefficient, mean absolute deviations and quadratic deviations are for the Streeter-Phelps model and the Enhanced DO-BOD model, respectively. The Streeter-Phelps model presented the best correlation to the experimental data with the values of R2 equal to 0.83; mean absolute deviation equal to 0.56 and quadratic deviations equal to 4.98.

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