scholarly journals Research on Correction Method of Water Quality Ultraviolet-Visible Spectrum Data Based on Compressed Sensing

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Fengxiao Li ◽  
Bin Tang ◽  
Mingfu Zhao ◽  
Xinyu Hu ◽  
Shenghui Shi ◽  
...  
Keyword(s):  
Water Quality ◽  
Absorption Spectrum ◽  
Compressed Sensing ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Suspended Particles ◽  
Sodium Oxalate ◽  
Visible Spectroscopy ◽  
Mathematical Methods ◽  
Standard Solution

The turbidity interference caused by suspended particles in water seriously affects the accuracy of ultraviolet-visible spectroscopy in detecting water quality chemical oxygen demand. Based on this, the application of ultraviolet-visible spectroscopy to detect water quality chemical oxygen demand usually requires physical and mathematical methods to correct the spectral baseline interference caused by turbidity. Because of the slow response speed and unstable compensation effect of traditional correction methods, this paper proposes to use a compressed sensing algorithm to perform baseline correction and achieve good results. In the experiment, we selected formazin turbidity solution and sodium oxalate standard solution and carried out the research on the algorithm of turbidity correction for detecting chemical oxygen demand of water quality by ultraviolet-visible spectroscopy. The experiment obtains the absorption spectra of different concentrations of formazine turbidity solutions and the same concentration of sodium oxalate with different turbidity standard solutions at 210∼845 nm and analyzes the nonlinear effect of absorbance on turbidity. This article uses standard solution experiments to explore the compressed sensing theory for turbidity correction, and through the correction of the absorption spectrum of the actual water sample, it verifies the feasibility of the compression theory for turbidity correction. The method effectively corrects the baseline shift or drift of the water quality ultraviolet-visible absorption spectrum caused by suspended particles, while retaining the absorption characteristics of the ultraviolet spectrum, and it can effectively improve the accuracy and accuracy of the ultraviolet-visible spectroscopy water quality chemical oxygen demand detection.

Spatio-temporal Variations in Water Quality Parameter Trends in River Waters

2018 ◽  
Vol 69 (10) ◽  
pp. 2940-2952 ◽  
Author(s):  
Martina Zelenakova ◽  
Pavol Purcz ◽  
Radu Daniel Pintilii ◽  
Peter Blistan ◽  
Petr Hlustik ◽  
...  
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Quality Indicators ◽  
Water Resource Management ◽  
Oxygen Demand ◽  
Temporal Variations ◽  
Water Quality Parameter ◽  
Agricultural Activity ◽  
Water Quality Indicators ◽  
Nitrite Nitrogen

Evaluating trends in water quality indicators is a crucial issue in integrated water resource management in any country. In this study eight chemical and physical water quality indicators were analysed in seven river profiles in the River Laborec in eastern Slovakia. The analysed water quality parameters were biochemical oxygen demand (BOD5), chemical oxygen demand (CODCr), pH, temperature (t), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), and total phosphorus (TP). Data from the monitored indicators were provided by the Ko�ice branch of the Slovakian Water Management Company, over a period of 15 years from 1999 to 2013. Mann�Kendall non-parametric statistical test was used for the trend analysis. Biochemical and chemical oxygen demand, ammonium and nitrite nitrogen content exhibit decreasing trends in the River Laborec. Decreasing agricultural activity in the area has had a significant impact on the trends in these parameters. However, NO2--N was the significant parameter of water quality because it mostly exceeds the limit value set in Slovak legislation, Regulation No. 269/2010 Coll. In addition, water temperature revealed an increasing trend which could be caused by global increase in air temperature. These results indicate that human activity significantly impacts the water quality.

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.

Application of Molecular Topology to the Prediction of Water Quality Indices of Alkylphenol Pollutants

2013 ◽  
pp. 1-10
Author(s):  
Jorge Gálvez ◽  
Miriam Parreño ◽  
Jordi Pla ◽  
Jaime Sanchez ◽  
María Gálvez-Llompart ◽  
...  
Keyword(s):  
Water Quality ◽  
Regression Analysis ◽  
Mathematical Models ◽  
Chemical Oxygen Demand ◽  
Cross Validation ◽  
Oxygen Demand ◽  
Molecular Topology ◽  
Quality Indices ◽  
Randomization Tests ◽  
Internal Validation

In this paper, topological-mathematical models based on multilineal regression analysis have been built as a model of the degradability of 26 alkylphenols through the Chemical Oxygen Demand (COD) and Biochemical Oxigen Demand (BOD5). Two models with three-variable were selected (r2= 0.8793 and q2=0.8075 for log(1/COD) and r2= 0.8928 and q2=0.8327 for log(1/BOD5). The models were validated by cross-validation, internal validation and randomization tests. The results, which stand in good accordance with the obtained results, confirm the robustness of the method.

scholarly journals Role of humic substances as refractory organic matter in sustainable water quality assessment and management

2019 ◽  
Vol 20 (2) ◽  
pp. 538-549
Author(s):  
Maoqing Duan ◽  
Xia Du ◽  
Wenqi Peng ◽  
Cuiling Jiang ◽  
Shijie Zhang
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Humic Substances ◽  
River Water ◽  
Anthropogenic Activities ◽  
Water Quality Management ◽  
National Development ◽  
Oxygen Demand ◽  
Study Results ◽  
The Impact

Abstract In northern China, river water originating from or flowing through forests often contains large amounts of oxygen-consuming organic substances, mainly humic substances. These substances are stable and not easily biodegradable, resulting in very high detection values of chemical oxygen demand. However, under natural conditions, the dissolved oxygen demand is not as high. Using experimental values to evaluate river water quality and the impact of human activities on water quality is thus unscientific and does not meet national development goals. In this study, the potential sources of high-concentration chemical oxygen demand in river water in two areas exposed to virtually no anthropogenic activities and strongly affected by humic substances, were analysed. The chemical oxygen demand contributed by humic substances (COD-HSs) was quantified using three methods. The results of water quality monitoring in 2017 and 2018 revealed that the chemical oxygen demand concentrations (5–44 mg/L) predominantly exceeded the standard (15 mg/L). The study results suggest that COD-HSs should be considered separately for objective evaluation and management of water quality, particularly in areas that are seriously affected by COD-HSs, to provide a scientific basis for formulating sustainable water quality management policies.

scholarly journals Community-based wastewater treatment systems and water quality of an Indonesian village

2013 ◽  
Vol 12 (1) ◽  
pp. 196-209 ◽  
Author(s):  
H. S. Lim ◽  
L. Y. Lee ◽  
S. E. Bramono
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Total Nitrogen ◽  
Oxygen Demand ◽  
Small Scale ◽  
Irrigation Canals ◽  
Community Based ◽  
E Coli ◽  
The Impact

This paper examines the impact of community-based water treatment systems on water quality in a peri-urban village in Yogyakarta, Indonesia. Water samples were taken from the wastewater treatment plants (WWTPs), irrigation canals, paddy fields and wells during the dry and wet seasons. The samples were tested for biological and chemical oxygen demand, nutrients (ammonia, nitrate, total nitrogen and total phosphorus) and Escherichia coli. Water quality in this village is affected by the presence of active septic tanks, WWTP effluent discharge, small-scale tempe industries and external sources. We found that the WWTPs remove oxygen-demanding wastes effectively but discharged nutrients, such as nitrate and ammonia, into irrigation canals. Irrigation canals had high levels of E. coli as well as oxygen-demanding wastes. Well samples had high E. coli, nitrate and total nitrogen levels. Rainfall tended to increase concentrations of biological and chemical oxygen demand and some nutrients. All our samples fell within the drinking water standards for nitrate but failed the international and Indonesian standards for E. coli. Water quality in this village can be improved by improving the WWTP treatment of nutrients, encouraging more villagers to be connected to WWTPs and controlling hotspot contamination areas in the village.

scholarly journals Water quality assessments and metagenomic analysis of the polluted river Apatlaco, Mexico

2019 ◽  
Author(s):  
Luz Breton-Deval ◽  
Katy Juárez ◽  
Alejandro Sánchez-Flores ◽  
Rosario Vera-Estrella
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Total Dissolved Solids ◽  
Quality Parameters ◽  
Freshwater Ecosystems ◽  
Dissolved Solids ◽  
The People ◽  
Nitrite Nitrate

ABSTRACTThe aim of this study is to analyze the water quality parameters and bacterial diversity and thereby understand the effect of water quality on the microbial population structure in the river. The following parameters: total coliforms, chemical oxygen demand, harness, ammonium, nitrite, nitrate, total Kjeldahl nitrogen, dissolved oxygen, total phosphorus, total dissolved solids, and temperature were analyzing along 17 sampling points in the river. The worst levels of pollution were 510 mg/L chemical oxygen demand, 7 mg/L nitrite, 45 mg/L nitrate, 2 mg/L dissolved oxygen, and 756 mg/L of total dissolved solids. Whole metagenome shotgun sequencing was performed at 4 key points along the river (P1,P7,P10 and P17), the first point had clean water and the other points were polluted, as a result of this pollution, the structure of microbial communities along the river have changed. Proteobacteria and Bacteroidetes were the most representative phyla with a relative abundance of 57 and 43% respectively for P1, 82 and 15% for P7, 69 and 27% for P10 and 87 and 10% for the last point P17. P1 is rich in microorganism such as Limnohabitans a planktonic bacterium very common in freshwater ecosystems. However, in P7, P10 and P17 are rich in opportunistic pathogens such as Acinetobacter Arcobacter and Myroides that endangers the health of around 1.6 million people which live around the area. These results elucidate the influence of the pollution on the microbial community and the likely effects on the health of the people around.

scholarly journals QUALIDADE DAS ÁGUAS URBANAS NO CÓRREGO VICENTE PIRES – DISTRITO FEDERAL

2021 ◽  
Vol 9 (1) ◽  
pp. 47
Author(s):  
Maria elisa Leite Costa ◽  
Sérgio Koide ◽  
Daniela Junqueira Carvalho ◽  
Jeremie Garnier
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Federal District ◽  
Water Quality Monitoring ◽  
Nitrogen And Phosphorus ◽  
Total Solids ◽  
Containment Measures ◽  
Distrito Federal

<p>Entre fevereiro de 2018 e janeiro de 2020, foi realizado o monitoramento hidrológico e de qualidade da água do Córrego Vicente Pires, localizado em uma zona urbana do Distrito Federal, a fim de avaliar as alterações na qualidade da água a partir da determinação de parâmetros físico-químicos, em eventos nos períodos seco e chuvoso. Foram elaborados polutogramas para os parâmetros de condutividade (elétrica), turbidez, pH, sólidos, demanda química de oxigênio e nutrientes (nitrogênio e fósforo), associados aos hidrogramas dos mesmos eventos, com vazões variando de 0,5 m³/s a 72,2 m³/s. O monitoramento dos eventos de cheia obteve concentrações de sólidos totais de até 7.583 mg/L, fosfato até 0,9 mg/L de PO<sub>4</sub><sup>3 </sup>e demanda química de oxigênio de até 958 mg/L. No período de estiagem, devido à menor disponibilidade de água no córrego, não há diluição de poluentes e  ressalta-se a concentração de nitrato (NO<sub>3</sub>até 9 mg/L)  em função dos lançamentos de esgotos domésticos no córrego. No período chuvoso, evidenciam-se os sólidos totais associados à lavagem da superfície e erosão do solo por grandes volumes gerados no escoamento superficial. Esses resultados expõem a necessidade de investimentos em infraestrutura de coleta de esgoto e drenagem urbana, inclusive, na adoção de medidas de contenção de sedimentos durante a realização de obras.</p><p><strong>Palavras-chaves:  </strong>Monitoramento hidrológico; Polutograma; Cheias.</p><p> </p><h2 align="center">URBAN WATERQUALITY IN THE VICENTE PIRES STREAM – FEDERAL DISTRICT</h2><p><strong>Abstract</strong></p><p>Between February 2018 and January 2020, hydrological and water quality monitoring of Vicente Pires Stream, located in the urban area of the Federal District, was carried out in order to assess the changes in water quality from the determination of physical-chemical parameters during events in the dry and rainy periods. Polutographs were prepared for parameters such as (electric) conductivity, turbidity, pH, solids, chemical oxygen demand and nutrients (nitrogen and phosphorus), associated with hydrographs of the same events, with flows that ranged from 0.5 m³/s to 72.2 m³/s. The monitoring of flood events showed concentrations of total solids up to 7,583 mg/L, phosphate up 0,9 mg/L PO43 and chemical oxygen demand up to 958 mg/L. During the dry season, due to the lower availability of water in the stream, there is no dilution of pollutants and the nitrate concentration stands out (NO3 up to 9 mg/L), due to discharges of domestic sewage into the stream. In the rainy season, the total solids associated with the washing of the surface and soil erosion by large volumes of runoff stand out. These results expose a need for investment in sewage collection and urban drainage infrastructures, including the adoption of sediment containment measures during the execution of construction.</p><p><strong>Keywords:</strong> Hydrological monitoring; Polutograph; Floods.</p>

scholarly journals Water Quality Distribution in Situ Gunung Putri Bogor Regency, Indonesia

2019 ◽  
pp. 1-8
Author(s):  
Zahidah Hasan ◽  
Thoriq Ilham ◽  
Yuli Andriani ◽  
Heti Herawati ◽  
Fachmijany Sulawesty
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Secchi Depth ◽  
Oxygen Demand ◽  
Aquatic Organisms ◽  
Quality Parameters ◽  
Survey Method ◽  
Optimal Range ◽  
Surface Level

The purpose of this study was to determine water quality distribution in Situ Gunung Putri. This research was conducted from February to March 2019, carried out in Situ Gunung Putri and at the Limnology Research Center of the Indonesian Institute of Sciences, both located in Bogor, West Java. The method used was the survey method. The results showed that, at the surface level, the temperature ranged between (28.14±0.52 and 30.61±1.76)°C, transparency between (0.38±0.12 and 0.65±0.06) m, dissolved oxygen (DO) was between 1.92±1.10 and 5.7± 2.55 mg / L, chemical oxygen demand (COD) was between 42.22±9.86 and 54.09±15.89, nitrate between (0.047±0.009 and 0.05±0.015) mg / L, phosphate of (0.015±0.002 and 0.022± 0.004) mg / L and pH was between 7.11± 0.27 and 7.33 ±0.34. Meanwhile at the Secchi depth values of the temperature ranged between (2.93±0.71 and 29.96 ±1.71)°C, DO was 1.14 ±0.90 and 3.37±1.63  mg / L, nitrate was 0.045±0.008 and 0.056±0.019 mg / L, phosphate was 0.016±0.003 and 0.035± 0.043 mg / L and pH was between 6.68± 0.33 and 7.11 ±0.28.  Based on these values water quality parameters except COD in  Situ Gunung Putri is still at the optimal range  for aquatic organisms.

scholarly journals ANALISIS KUALITAS AIR DAN BEBAN PENCEMARAN AIR PADA SUB DAS BOENTUKA KABUPATEN TIMOR TENGAH SELATAN

2019 ◽  
Vol 23 (1) ◽  
pp. 56 ◽  
Author(s):  
Umbu A Hamakonda ◽  
Bambang Suharto ◽  
Liliya Dewi Susanawati
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Chemical Oxygen Demand ◽  
River Water ◽  
Fecal Coliform ◽  
Oxygen Demand ◽  
Pollution Index ◽  
Biological Oxygen Demand ◽  
Pollution Load ◽  
River Water Pollution

Rivers in the Boentuka Sub-watershed of Timor Tengah Selatan Regency have been shown to experience pollution caused by domestic and agricultural activities. This study aims to assess water quality and identify river water pollution loads based on water quality according to Government Regulation Number 82 of 2001 concerning water pollution management and control. The parameters analyzed were physical, chemical, and biological, the length of the river in the Boentuka Sub-watershed was 15km. The method of river water pollution index from upstream to downstream in 6 sampling points with test parameters such as the biological oxygen demand, chemical oxygen demand, fecal coliform and total coliform in the downstream has exceeded the criteria of class I water quality standards according to PP No. 82 of 2001. Pollution index of 1.11 to 4.62. This shows that the quality of river water has been polluted with mild pollution status. While the pollution load of domestic waste dumped into the river is on the biological oxygen demand parameter of 6297,584 kg / day and chemical oxygen demand of 7871.98 kg / day, fecal coliform pollution load of 458.0108 MPN / day and totalcoli 1210.121 MPN / day

scholarly journals Total Maximum Allocated Load of Chemical Oxygen Demand Near Qinhuangdao in Bohai Sea: Model and Field Observations

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1141 ◽  
Author(s):  
Zhichao Dong ◽  
Cuiping Kuang ◽  
Jie Gu ◽  
Qingping Zou ◽  
Jiabo Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Carrying Capacity ◽  
Bohai Sea ◽  
Water Environment ◽  
Oxygen Demand ◽  
Pollutant Emission ◽  
Optimization Approach ◽  
Environment Management ◽  
Total Maximum

Total maximum allocated load (TMAL) is the maximum sum total of all the pollutant loading a water body can carry without surpassing the water quality criterion, which is dependent on hydrodynamics and water quality conditions. A coupled hydrodynamic and water quality model combined with field observation was used to study pollutant transport and TMAL for water environment management in Qinhuangdao (QHD) sea in the Bohai Sea in northeastern China for the first time. Temporal and spatial variations of the chemical oxygen demand (COD) concentration were investigated based on MIKE suite (Danish Hydraulic Institute, Hørsholm, Denmark). A systematic optimization approach of adjusting the upstream pollutant emission load was used to calculate TMAL derived from the predicted COD concentration. The pollutant emission load, TMAL, and pollutant reduction of Luanhe River were the largest due to the massive runoff, which was identified as the most influential driving factor for water environmental capacity and total carrying capacity of COD. The correlation analysis and Spearman coefficient indicate strong links between TMAL and forcing factors such as runoff, kinetic energy, and pollutant emission load. A comparison of total carrying capacity in 2011 and 2013 confirms that the upstream pollutant control scheme is an effective strategy to improve water quality along the river and coast. Although, the present model results suggest that a monitoring system could provide more efficient total capacity control. The outcome of this study establishes the theoretical foundation for coastal water environment management strategy in this region and worldwide.

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