scholarly journals Limnology of wastewater treatment lagoons at Pagla, Narayanganj

1970 ◽  
Vol 40 (1) ◽  
pp. 35-40
Author(s):  
Md Ataul Gani ◽  
Md Almujaddade Alfasane ◽  
Moniruzzaman Khondker
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Population Density ◽  
Water Temperature ◽  
Significant Positive Correlation ◽  
Secchi Depth ◽  
Gradual Improvement ◽  
Mean Values ◽  
Chl A ◽  
Suspended Matters

Limnology of two wastewater treatment lagoons, (Lagoon numbers 1 and 10 are treated as L-1 and L-2, respectively) at Pagla, Narayanganj considering 15 water quality variables had been carried out for 10 months. Air and water temperature did not vary significantly. Secchi depth (Zs) showed gradual improvement from the lagoon 1 to lagoon 10 due to low loading of suspended matters. Improvement of water quality from L-1 to L-2 has also been observed in respect to alkalinity, conductivity and TDS. Similar trends were also seen for SRS and SRP. In L-1 anoxia occurred three times whereas it was absent in L-2. In the present study, improved DO prompted NO3-N and TDS concentration. However in L-2, mean values of SRP dropped by about 13% than L-1. A significant positive correlation between the density of phytoplankton and SRP in L-2 at 5% level was obtained. A total of 105 species of phytoplankton belonging to 6 different algal classes were recorded from the lagoons. Highest number of species was obtained from Chlorophyceae followed by Euglenophyceae, Bacillariophyceae, Cyanophyceae, Cryptophyceae and Dinophyceae. The population density of phytoplankton and that of zooplankton in L-1 was low compared to L-2. Higher number of genera and species occurred in L-2 than L-1. Chl a and pheopigment concentrations were also higher in L-2. Results indicated that water quality has increased in the treatment pond number 10. Key words: Limnology; Wastewater treatment lagoons; Pagla; Bangladesh DOI: http://dx.doi.org/10.3329/bjb.v40i1.7995 Bangladesh J. Bot. 40(1): 35-40, 2011 (June)

scholarly journals Effects of water quality on phytoplankton biomass in Balu river, Dhaka, Bangladesh

2021 ◽  
Vol 6 (1) ◽  
pp. 37-46
Author(s):  
MAH Bhuiyan ◽  
MR Islam ◽  
SA MS Islam ◽  
A Kowser ◽  
M Mohid ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Phytoplankton Biomass ◽  
Secchi Depth ◽  
Soluble Reactive Phosphorus ◽  
Co2 Concentration ◽  
Quality Parameters ◽  
Total Density ◽  
Chl A ◽  
Reactive Phosphorus

The Balu River is a peripheral river of Dhaka Metropolis and like other rivers its water quality is also highly vulnerable towards pollution. In the present study, effects of water quality parameters on the phytoplankton biomass have been studied for six climatic seasons of the year. The results obtained were compared with two other rivers of Dhaka Metropolis namely, Buriganga and Turag. Balu River showed water quality characters almost comparable with two other rivers. The phytoplankton biomass as chlorophyll a (chl-a) was found to be correlated directly with air and water temperature and alkalinity of the water. However, a weak positive correlation was obtained between chl-a and Secchi depth and free CO2 concentration. Nitrate nitrogen showed weak negative correlation with chl-a and phaeopigment and phytoplankton total density. High fluctuation was observed in the concentration of DO (0.20 - 4.50 mg/l) and free CO2 (0.06 - 2.90 mg/l) throughout the seasons. Soluble reactive phosphorus ranged from 30 - 1248 μg/l and chl-a ranged from 6.77 - 32.60 μg/l. Phytoplankton density ranged 1178 - 7409×103 ind./l over the study year. Water color ranged from light blue to dark black. The depth of visibility as Secchi depth varied from 15.24 - 81.28 cm whilst the water depth of the studied station Paschim Gaon of Balu River ranged from 4.57 - 7.92 m. Air and water temperature ranged from 25.4 - 36.5°C and 23.4 - 32.3°C, respectively. J. Biodivers. Conserv. Bioresour. Manag. 2020, 6(1): 37-46

scholarly journals Relationship between water quality assessment and phytoplankton community structure of M River in Shijiazhuang City

2021 ◽  
Vol 267 ◽  
pp. 01026
Author(s):  
Ziqi Zhang ◽  
Lei Yang ◽  
Zemeng Duan ◽  
Hongyan Shen
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Water Temperature ◽  
Significant Positive Correlation ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Pearson Correlation ◽  
Phytoplankton Community Structure ◽  
Positive Correlation ◽  
Quality Indexes

On the basis of the “Environmental quality standard for surface water” (GB 3838-2002) in China, eight water quality indexes were measured in M River, including pH, water temperature (T), transparency (SD), dissolved oxygen (DO), chemical needs Oxygen (COD), ammonia nitrogen (NH3-N), total nitrogen (TN), total phosphorus (TP). Using the single factor index method, it is concluded that the water pollution of M River is serious and the water quality is beyond Grade V of water environment standard. Moreover some indexes of the water quality meet with the standard level, including COD, NH3-N, TN and TP. The Pearson correlation analysis is conducted between water quality indexes and phytoplankton community parameters. After phytoplankton qualitative and quantitative analysis, the phytoplankton community characteristics in Minxin River were analyzed by Dominance index (Y), Shannon-Wiener diversity index (H’), Margalef Species diversity index (d) and Pielou evenness index (J). H’ and TN was a significant positive correlation (r = 0.923, P <0.05); J and COD was a significant positive correlation (r = 0.918, P <0.05); There was a very significant negative correlation between d and water temperature (T), COD, NH3-N, TN (r =-0.881, P <0.01; r =-0.983, P <0.01; r =-0.893, P <0.01; r=-0.962, P<0.01). The result of the research indicates that T, COD, NH3-N and TN are main water quality indexes affecting phytoplankton community structure.

scholarly journals Impacts Assessment of Coastal Activities on Water Quality of Upper Segment of Qua Iboe River, Akwa Ibom State, South-South, Nigeria

2020 ◽  
Vol 24 (7) ◽  
pp. 1217-1222
Author(s):  
U.E. Jonah ◽  
E.S. Iwok ◽  
H.E. Hanson
Keyword(s):  
Water Quality ◽  
Impact Assessment ◽  
Water Temperature ◽  
Anthropogenic Activities ◽  
Water Quality Monitoring ◽  
Federal State ◽  
Human Consumption ◽  
Wet Season ◽  
Mean Values ◽  
Significant Difference

A study was carried out at the supper segment of Qua Iboe River from November, 2018 to August, 2019 in four sampling stations to assess the  impacts of coastal activities on water quality. Water samples were collected monthly and analyzed using standard procedures of Associations of Official Analytical Chemist and American Public Health Association. The stations comparisons and location of significant differences were carriedout using ANOVA and Least Significant Difference (LSD) test, while paired sample t-test were employed to compare the seasonal difference. The mean ranged values of water temperature were (25.03 – 25.330C), pH (5.8 –6.6 mg/l), DO(3.11 - 5.45 mg/l), TDS (18.63 – 32.53mg/l), EC  (8.33-13.16􀀁s/cm), Turbidity (7.61 – 18.32 NTU), TSS (90.80 - 165.63 mg/L), NO3 -1(33.02 – 78.33mg/l), P04 3-(4.44 – 7.39mg/l), Cl-(43.60 – 63.21mg/l), COD(35.96 – 113.05mg/l), NH3(0.33 – 0.62 mg/l). Mean values of TSS, EC, TSS, NO3, PO4 3-, NH3 and turbidity were higher in wet season, while water temperature, pH, DO, Cl- and COD values obtained were higher in dry season. Spatial variations in parameters were ascribed to levels of  anthropogenic activities and wastes discharged within the stations; the seasonal variations were emanated from influx of wastes, and dilution as result of surface run-offs during wet season. Based on the findings, the WQI values were poor for human consumption; especially from station 2 to4.These calls for urgent attention by Federal / State Ministry Health and Environment regards to its effects on human health and consistent water quality monitoring should be put into consideration. Keywords: Impact, Assessment, Coastal activities, Water Quality, Qua Iboe River Keywords: Impact, Assessment, Coastal activities, Water Quality, Qua Iboe River

scholarly journals Water Quality Properties Derived from VIIRS Measurements in the Great Lakes

2020 ◽  
Vol 12 (10) ◽  
pp. 1605
Author(s):  
Seunghyun Son ◽  
Menghua Wang
Keyword(s):  
Water Quality ◽  
Great Lakes ◽  
Lake Erie ◽  
Infrared Imaging ◽  
Seasonal Pattern ◽  
Secchi Depth ◽  
Phytoplankton Production ◽  
Quality Properties ◽  
Chl A ◽  
Freshwater Inputs

Refined empirical algorithms for chlorophyll-a (Chl-a) concentration, using the maximum ratio of normalized water-leaving radiance nLw(λ) at the blue and green bands, and Secchi depth (SD) from nLw(λ) at 551 nm, nLw(551), are proposed for the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) satellite in the Great Lakes. We demonstrated that water quality properties and phytoplankton production can be successfully monitored and assessed using the new regional Chl-a and SD algorithms, with reasonably accurate estimates of Chl-a and SD from the VIIRS-SNPP ocean color data in the Great Lakes. VIIRS-derived Chl-a and SD products using the proposed algorithms provide the temporal and spatial variabilities in the Great Lakes. Overall, Chl-a concentrations are generally low in lakes Michigan and Huron, while Chl-a data are highest in Lake Erie. The seasonal pattern shows that overall low Chl-a concentrations appear in winter and high values in June to September in the lakes. The distribution of SD in the Great Lakes is spatially and temporally different from that of Chl-a. The SD data are generally lower in summer and higher in winter in most of the Great Lakes. However, the highest SD in Lake Erie appears in summer, and lower values in winter. Significantly high values in Chl-a, and lower values in SD, in the nearshore regions, such as Thunder Bay, Saginaw Bay, and Whitefish Bay, can be related to the very shallow bathymetry and freshwater inputs from the land. The time series of VIIRS-derived Chl-a and SD data provide strong interannual variability in most of the Great Lakes.

scholarly journals Phytoplankton in relation to water quality of Tanguar Haor ecosystem, Bangladesh: I. Rauar station

2019 ◽  
Vol 28 (2) ◽  
pp. 131-138
Author(s):  
Mohammad Azmal Hossain Bhuiyan ◽  
SAM Shariar Islam ◽  
Abu Kowser ◽  
Md Rasikul Islam ◽  
Shahina Akter Kakoly ◽  
...  
Keyword(s):  
Water Quality ◽  
Air Temperature ◽  
Environmental Variables ◽  
Secchi Depth ◽  
Soluble Reactive Phosphorus ◽  
Organic Pollution ◽  
Quality Data ◽  
Water Quality Data ◽  
Chl A ◽  
Reactive Phosphorus

The water quality at Rauar station of Tanguar Haor, Sunamganj was assessed studying phytoplankton and associated environmental variables. The environmental variables were monitored over a period of one year, collecting samples at two months interval between March, 2017 and March, 2018. Air temperature, rainfall, and humidity ranged from 22.6 - 32.1°C, 48 - 76% and 8 - 930 mm, respectively. Air temperature showed a direct relationship with water temperature which varied from 22.4 - 31.0°C during the study period. The water transparency remained relatively constant throughout the year having a mean Secchi depth (Zs) value of 2.48 m. Total dissolved solids (TDS), conductivity, and pH of the water ranged from 51 - 85 mg/l, 60 - 110 μS/cm, and 7.2 - 9.7, respectively. In December, because of a temperature fall, the dissolved oxygen (DO) concentration of the water reached its maximum value of 6.09 mg/l. In the rest of the period, the concentration remained between 2.44 and 4.80 mg/l. The value of alkalinity ranged from 0.43 - 1.35 meq/l. Among the nutrients, soluble reactive phosphorus (SRP), soluble reactive silicate (SRS), and NO3-N ranged from 5.43 - 36.43 μg/l, 4 - 14.58 mg/l, and 0.06 - 0.31 mg/l, respectively. The concentration of NH4+ ranged from 238 - 1230 μg/l. The highest concentrations (905 and 1230 μg/l) occurred between September and December, 2017. This might be attributed to the higher density of migratory birds during that period. The phytoplanktonic biomass expressed as chlorophyll-a (Chl-a) ranged from 1.35 - 8.45 μg/l while its degraded product phaeophytin concentration ranged from 0.08 - 3.5 μg/l. The standing crop of phytoplankton ranged from 397 - 2480 × 103 individuals/l of haor water exhibiting its maximum abundance in September. This parameter showed a highly significant positive correlation with SRP. From the correlation analysis, the degradation of chl-a to phaeophytin was found to be temperature dependent. Considering the different physicochemical and biological water quality data, it could be said that the Tanguar Haor is still free from organic pollution. However, the range of soluble reactive phosphorus data (5.43 - 36.43 μg/l) show that the Haor has been passing a meso-eutrophic state. Dhaka Univ. J. Biol. Sci. 28(2): 131-138, 2019 (July)

scholarly journals Temporal and Vertical Relations between Various Environmental Factors in the Largest Lake of Łęczna-Włodawa Lake District (Eastern Poland)

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1263 ◽  
Author(s):  
Beata Ferencz ◽  
Magdalena Toporowska ◽  
Jarosław Dawidek
Keyword(s):  
Water Temperature ◽  
Secchi Depth ◽  
Detrended Correspondence Analysis ◽  
Weather Conditions ◽  
Lake District ◽  
Chl A ◽  
Physico Chemical ◽  
Ordination Techniques ◽  
Components Analysis ◽  
Directional Relations

Due to global warming and increasing water eutrophication, understanding in-lake relationships is paramount to prevent excessive pollution and further negative changes in lakes. The physico-chemical and biological parameters, as well as nutrient variabilities, both temporal and vertical (in the water column), were studied in the largest Łęczna-Włodawa lake. The study was conducted during two consecutive water years, from November 2015 to September 2017. The non-parametric Kruskal–Wallis ANOVA, test H was used to detect variability between years, and among seasons and lake depths in water temperature, electrical conductivity, pH, ORP, concentration of dissolved oxygen as well as concentration of NO3−, PO43−, TP and chlorophyll a. One-way analysis of variance (ANOVA) was used to detect any differences in Secchi depth (SD) and concentration of NH4+, NO2−, and TN. Ordination techniques: Detrended correspondence analysis (DCA), and Principal Components Analysis (PCA) were used to describe the relationships among 13 environmental variables and distribution of samples. Results showed significant differences (P < 0.05) between two years of the study for most variables except of water temperature, visibility, concentration of PO43−, TN and TP, which corresponded with highly different weather conditions in both years. All of the tested variables, except for nutrients, differed significantly among seasons. Most parameters showed fluctuation in depth, especially in summer and in winter, despite the fact that no hypolimnion or long-lasting thermocline was observed in the study period. However, variability of Chl-a was statistically significant only. The results emphasized complex and multi-directional relations between tested variables, dependent on both external (catchment) and internal (in-lake) processes.

Spatiotemporal Variation of Chlorophyll a and its Relationship with other Water Quality Factors in the Tai Lake

2011 ◽  
Vol 183-185 ◽  
pp. 783-789
Author(s):  
Xing Cai Liu ◽  
Zong Xue Xu ◽  
Guo Qiang Wang
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Temporal Variations ◽  
Quality Factors ◽  
Mean Values ◽  
Chl A ◽  
Four Seasons ◽  
Tai Lake ◽  
Sample Data ◽  
Meiliang Bay

Algae bloom in the Tai Lake is a major issue and affects the water supply to the surrounding cities greatly. Chlorophyll a (Chl-a) is a common indicator that represent the trophic status in lakes. Spatial and temporal variations of Chl-a concentration are analyzed on the basis of sample data at 21 sites during the period of 2001 to 2005. Data at the sites located in the Meiliang Bay, Zhushan and Wulihu show greater fluctuations than that at other sites. A general trend showing that high values in northern part and low values in southern part of the Tai Lake is observed in seasonal mean values of Chl-a concentration for four seasons. Most high Chl-a concentrations occurred in summer (June to August) and autumn (September to November). Quantitative relationships between Chl-a and other water quality factors are investigated at all sites. Relative good relationships are obtained between Chl-a concentration and other water quality factors during 2001 to 2004 by using partial least squared regression. Prediction of Chl-a concentration in 2005 with above models produce worse results, which may be due to the occurrence of some extreme high values of Chl-a concentration in that year. Even though, acceptable predictions are obtained at several sites. Since the water quality in the lake is affected greatly by the inflow of nutrients from rivers, these relationships will be helpful for monitoring Chl-a variation with the combination of hydrological models that is able to simulate the inflow of nutrients.

scholarly journals Spatial and Temporal Variations of Water Quality and Trophic Status in Sembrong Reservoir, Johor

2018 ◽  
Vol 34 ◽  
pp. 02015
Author(s):  
Syarifah Intan Najla Syed Hashim ◽  
Siti Hidayah Abu Talib ◽  
Muhammad Salleh Abustan
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Conventional Treatment ◽  
Trophic Status ◽  
Secchi Depth ◽  
Lower Boundary ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
Reservoir Water

A study of spatial and temporal variations on water quality and trophic status was conducted to determine the temporal (average reading by month) and spatial variations of water quality in Sembrong reservoir and to evaluate the trophic status of the reservoir. Water samples were collected once a month from November 2016 to June 2017 in seventeen (17) sampling stations at Sembrong Reservoir. Results obtained on the concentration of dissolved oxygen (DO), water temperature, pH and secchi depth had no significant differences compared to Total Phosphorus (TP) and chlorophyll-a. The water level has significantly decreased the value of the water temperature, pH and TP. The water quality of Sembrong reservoir is classified in Class II which is suitable for recreational uses and required conventional treatment while TSI indicates that sembrong reservoir was in lower boundary of classical eutrophic (TSI > 50).

scholarly journals Assessment of three different parameters of urban ponds at Rajshahi, Bangladesh

2012 ◽  
Vol 19 ◽  
pp. 59-63
Author(s):  
FA Flowra ◽  
JK Ghosh ◽  
AS Tumpa ◽  
SN Jahan
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Oxygen Demand ◽  
Mean Value ◽  
Ammonium Ion ◽  
Total Hardness ◽  
Mean Values ◽  
Physico Chemical ◽  
The Mean ◽  
Carbon Dioxide Co2

Context: Physico-chemical factors directly affect the water quality. Biological parameters varied from pond to pond according to the water quality. Objective: To assess the physico-chemical conditions and plankton abundance in the studied ponds. Materials and Methods: The study was carried out for a period of seven months from June, 2008 to December, 2008 in six ponds of Rajshahi Metropolitan area. Surface water samples were collected once a month at 10-11 am in black plastic bottle and analyzed for the estimation of different parameters. Water temperature, transparency, pH, dissolved oxygen (DO), free carbon dioxide (CO2), biological oxygen demand (BOD), nitrite nitrogen (NO2––N), nitrite (NO2), toxic ammonia, ammonium ion (NH4+) and total hardness were measured. The density of plankton was also estimated. Results: The mean values of water temperature varied from 28.73 ± 3.98 (Pond 6) to 29.56 ± 4.68°C (Pond 4) and the pH varied from 7.37 ± 0.26 (Pond 6) to 8.57±0.26 (Pond 4). The DO varied 1.66 ± 1.03 (Pond 1) to 4.68 ± 0.36 mg/l (Pond 6) and the mean value of free CO2 varied from 4.29 ± 0.37 (Pond 5) to 50.91 ±19.30 mg/l (Pond 3). The total hardness was 136.79 ± 20.28 (Pond 6) to 183.14 ± 51.17 mg/l (Pond 3) with NO2–varied from 0.003 ± 0.002 (Pond 5) to 2.08 ± 0.59 mg/l (Pond 4). The mean total phytoplankton was 28761.43 ± 2912.62 (Pond 2) to 63629.29 ± 20214.44 cells/l (Pond 4) and the mean total zooplankton was 13314.24 ± 3189.70 cells/l (Pond 5) to 18820.00 ± 932.51 cells/l (Pond 4). Conclusion: The deterioration in the physico-chemical quality and plankton population observed in this study is alarming, and periodic monitoring and preventative measures are required to save the aquatic system from eutrophication. DOI: http://dx.doi.org/10.3329/jbs.v19i0.13002 J. bio-sci. 19 59-63, 2011

scholarly journals Physico-chemical features of water in Betana wetland, Belbari, Morang, Nepal

2018 ◽  
Vol 2 ◽  
pp. 66-75
Author(s):  
Ganesh Bahadur Thapa ◽  
Joydeb Pal
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Significant Positive Correlation ◽  
Pond Water ◽  
Total Hardness ◽  
Total Acidity ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Permissible Range ◽  
Periodic Evaluation

Different physico-chemical parameters in Betana wetland pond water was studied for two years. Air temperature showed positive and significant correlation with water temperature (r =0.947, P<0.01) but it had inverse and significant correlation with free CO2 (r = -0.685, P<0.05), pH (r = -0 .653, P<0.05) and DO (r = -0.582, P<0.05). The water temperature showed positive and significant correlation with phosphate (r =0.635, P<0.05) but it showed inverse and significant correlation with pH (r = -0.692, P<0.05), DO (r = -0.576, P<0.05) and free CO2 (r = -0.798, 2 P<0.01). Free CO2 showed inverse and significant correlation with chloride (r = -0.596, P<0.05). BOD showed no significant positive correlation but it had inverse and significant correlation with pH (r = -0.613, P< 0.05). Total acidity (TA) showed positive and significant correlation with total hardness (TH) (r = 0.580, P<0.05) but inverse and significant correlation with water temperature (r = -0.623, P<0.05) and phosphate (r = -0.608, P<0.05). All physico-chemical parameters of Betana pond water were within permissible range for wild fish and fish culture. Outbreak of any fish diseases did not occur during Nov. 2008-Oct. 2010. Being ecotourism area, maintenance of water quality should be done by periodic evaluation of physico-chemical parameters of the pond water.

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