Analysis of trends in water quality: constructed wetlands in metropolitan Taipei

2011 ◽  
Vol 64 (11) ◽  
pp. 2143-2150 ◽  
Author(s):  
B.-Y. Cheng ◽  
T.-C. Liu ◽  
G.-S. Shyu ◽  
T.-K. Chang ◽  
W.-T. Fang
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Constructed Wetlands ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Kendall Test ◽  
Base Flow ◽  
Riparian Wetlands ◽  
Mann Kendall Test ◽  
Improve Water Quality

Meandering through the most densely populated metropolitan areas of Taipei, Taiwan, the Danshui River and its tributaries have undergone the construction of 14 wetlands since 2004, as a means to improve water quality. This study was conducted to examine the functional capabilities associated with treating non-point source pollution through these riparian wetlands. Trend analysis was used to differentiate dissolved oxygen, biochemical oxygen demand, suspended solids, ammonia, and Escherichia coli, among 13 sampling sites using both functions of a Mann–Kendall test and a seasonal Mann–Kendall test. The results show that water quality in Taipei metropolitan rivers has been improving since increasing the number of constructed wetlands and connecting households to the public sewage system. The concentration of pollutants such as those influencing biochemical oxygen demand have gradually declined in drought seasons because riparian wetlands contribute a base flow to dilute riverine pollutants. This paper indicates that the creation of treatment systems influences dissolved oxygen conditions at the municipal scale, suggesting that constructed wetlands could stabilize water quality during extreme hydrological events and improve water quality particularly in times of drought.

scholarly journals Artificial floating islands for water quality improvement

2017 ◽  
Vol 25 (3) ◽  
pp. 350-357 ◽  
Author(s):  
Yueya Chang ◽  
He Cui ◽  
Minsheng Huang ◽  
Yan He
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Constructed Wetlands ◽  
Oxygen Demand ◽  
Key Factors ◽  
Water Quality Improvement ◽  
Factors Influencing ◽  
Wetland Treatment ◽  
Improve Water Quality

Artificial floating islands (AFIs) are a variation of wetland treatment systems for water quality improvement. This paper provides a review concerning AFIs in terms of their development, classification, and applications in the removal of nutrients, heavy metals, and chemical oxygen demand on waterways. The role of microorganisms, aquatic plants, and aquatic animals in AFIs for water decontamination and purification was also discussed. Additionally, some key factors influencing the AFIs’ performances were discussed and comparisons between AFIs and constructed wetlands were reviewed. Finally, further perspectives of artificial floating islands were identified to possibly improve their performances. The understanding of the mechanisms in AFIs that drive removal of various contaminants to improve water quality is crucial, and is also highlighted in this paper.

scholarly journals Assessment of the Water Quality Characteristics of Kaduna River Receiving Wastewater Discharges

2019 ◽  
Vol 3 (1) ◽  
pp. 56-61
Author(s):  
H. Garba ◽  
C. A. Elanu
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Quality Characteristics ◽  
Chemical Characteristics ◽  
Mean Concentration ◽  
Concentration Levels

An assessment of the chemical characteristics of industrial and domestic wastewater discharges on seven parameters into Kaduna River on a bimonthly basis was carried out. PH, dissolved oxygen (DO), chloride, nitrite, chemical oxygen demand (COD), biochemical oxygen demand (BOD) and iron were analyzed to determine their concentration levels. From the analysis, the highest mean concentration of the parameters were 8.24 of pH, 7.7 mg/l of DO, 233.4 mg/l of chloride, 55.68 mg/l of COD, 27.95 mg/l of nitrite, 122.22 mg/l of BOD, and 17.05 mg/l of iron. After comparing with prescribed standards, it can be concluded that there is evidence of organic and inorganic accumulation of contaminants into River Kaduna.

Linear stochastic optimization applied to biochemical oxygen demand – dissolved oxygen modelling

1986 ◽  
Vol 13 (2) ◽  
pp. 249-254 ◽  
Author(s):  
Donald H. Burn ◽  
Edward A. McBean
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
Lognormal Distribution ◽  
Water Quality Management ◽  
Oxygen Demand ◽  
Simulation Modelling ◽  
Chance Constrained Programming ◽  
Management Problem ◽  
Transfer Coefficients

A methodology for reflecting stochastic considerations in an optimization model is presented. The technique, which uses chance-constrained programming, is applied to a water quality management problem wherein concern is with the interaction between biochemical oxygen demand (BOD) and the dissolved oxygen (DO) concentration in a river. The uncertainty in the problem is considered to be embodied in transfer coefficients for which a lognormal distribution is derived from moment estimates provided by first-order uncertainty analysis. The appropriateness of the lognormal distribution is confirmed by results from a simulation modelling exercise. Key words: water quality, optimization, uncertainty, mathematical modelling.

Long-Term Trends of Water Quality in Upstream of Daling River in China

2012 ◽  
Vol 599 ◽  
pp. 673-677
Author(s):  
Hui Xiu Wu ◽  
Cui Ling Jiang ◽  
Zhong Du
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
North China ◽  
Oxygen Demand ◽  
Main Stream ◽  
Significant Heterogeneity ◽  
Long Term Trends ◽  
Increasing Trends

Long-term trends and spatial patterns of water quality at 5 stations in the upstream of the Daling River basin of North China were examined for 5 parameters—pH, suspended sediment (SS), dissolved oxygen (DO), permanganate demand (CODMn) and biochemical oxygen demand (BOD5). Analysis determined the trends of parameters of each station between 1987 and 2007. The variations in permanganate demand and biochemical oxygen demand showed increasing trends and the variations in dissolved oxygen were decrease in 1990s. Multi-year average values of permanganate demand and dissolved oxygen in Chaoyang station and Jianping station were 2.8 mg/L, 37.6 mg/L and 9.6 mg/L, 6.1 mg/L, respectively. The parameter characteristics of water quality in flood and dry season showed significant heterogeneity at main stream and tributary. Correlations between parameters were analyzed using a regression analysis method. The correlations of each parameter determined there were linear negative correlation between dissolved oxygen and permanganate demand, dissolved oxygen and biochemical oxygen demand at Habaqi station, Dachengzi station and Chaoyang station. The permanganate demand and biochemical oxygen demand was significant positive correlation in 3 stations.

scholarly journals REDUÇÃO DA CARGA ORGÂNICA LANÇADA EM UM TRECHO DO RIO CAPIBARIBE PARA ATENDIMENTO À LEGISLAÇÃO AMBIENTAL (Reduction Of Organic Loading Launched In A Specific Area In The Capibaribe River To Comply With Environmental Legislation)

2019 ◽  
Vol 12 (3) ◽  
pp. 837
Author(s):  
Renato Alves Pereira ◽  
Diogo Henrique Fernandes Da Paz ◽  
Ioná Maria Beltrão Rameh Barbosa
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Specific Area ◽  
Point Sources ◽  
Environmental Legislation ◽  
Organic Loading ◽  
Pollution Effects ◽  
Sanitation Infrastructure

A bacia hidrográfica do rio Capibaribe apresenta sérios problemas de poluição. Isto se deve a falta de infraestrutura sanitária dos municípios que margeiam o rio atrelado às baixas taxas de vazões. Modelos matemáticos de qualidade da água são importantes ferramentas no estudo dos efeitos da poluição por fontes pontual e não pontual, bem como a avaliação de cenários, visando o cumprimento da legislação. Este artigo apresenta os resultados da modelagem matemática da qualidade da água, utilizando o modelo QUAL-UFMG, especificamente no trecho localizado entre o ponto da estação de monitoramento (39150000) e a (39188000), totalizando um trecho de 41,2 km, que compreende os municípios de Paudalho, São Lourenço da Mata e Camaragibe na bacia do rio Capibaribe, em Pernambuco. A pesquisa obteve os dados de entrada requeridos pelo modelo, efetuou-se a calibração dos parâmetros e, em seguida, realizou-se a validação para o ano de 2011 referentes ao Oxigênio Dissolvido e a Demanda Bioquímica de Oxigênio. Como conclusão, observou-se que o esgoto doméstico advindo dos municípios de Paudalho, São Lourenço da Mata e Camaragibe e do matadouro localizado em São Lourenço da Mata, contribuem consideravelmente para a poluição do rio Capibaribe neste trecho.  A B S T R A C TThe catchment area of the Capibaribe river presents serious water quality problems. This is due the lack of sanitation infrastructure in the municipalities bordering the Capibaribe river coupled up to low flows rate. Mathematical models of water quality are important tools in the study of pollution effects, specifically point and non-point sources, as well as on the scenarios evaluation, aiming to comply with the legislation. This article shows the results from a mathematical modeling of water quality using the QUAL-UFMG model in the Capibaribe river basin specifically the portion situated between the station (39150000) and (39188000), Totaling 41,2km (approximately 25,60mi), using techniques of Geographic Information Systems (SIG). The study obtained the input data required by the model and made the calibration parameters and then there was the validation for the year 2011 related to dissolved oxygen and biochemical oxygen demand. We conclude that the domestic sewage arising from the cities of Paudalho, São Lourenço da Mata and Camaragibe and the slaughterhouse located in São Lourenço da Mata contribute significantly to the pollution of the Capibaribe river in this area.Keywords: Pollution, QUAL-UFMG, dissolved oxygen and biochemical oxygen demand. 

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