First evaluation of iron and manganese concentrations in coastal aquaculture water in Giao Thuy district, Nam Dinh province

Aquaculture in the coastal zone has contributed significantly to economic development in Giao Thuy district, Nam Dinh province. Therefore, water quality for aquaculture plays a vital role in sustainable aquaculture production. In this paper, iron (Fe) and manganese (Mn) concentrations in aquaculture coastal water of Giao Thuy district were analyzed during the rainy season (September 2017, August 2018) and dry season at low tide. The results showed that Fe concentration varied from 0.09 mg/L (at VT5) to 2.42 mg/L (at VT4), averaging 1.12 ± 0.71 mg/L, which exceeded the critical value of the national technical regulation on marine water quality in Vietnam for coastal aquaculture water (QCVN 10:2015/BTNMT) from 1.5 times (at VT4) to 3.0 times (at VT1). Mn concentrations ranged from 0.02 mg/L (at VT9) to 0.10 mg/L (at VT1), averaging 0.05 ± 0.02 mg/L, which was lower than the critical value in the QCVN 10:2015/BTNMT. The results showed that no apparent seasonal variation was observed for both Fe and Mn concentrations. In the dry season, the Fe and Mn concentrations averaged 1.10 mg/L and 0.05 mg/L respectively, whereas they were 1.15 mg/L and 0.05 mg/L in the rainy season. The monitoring results showed that Fe was polluted in the study area and may affect aquaculture productivity. Therefore, helpful measures should be taken to minimize Fe pollution to protect water quality and develop sustainable aquaculture in Giao Thuy district, Nam Dinh province.

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Aquatic Macro-invertebrates as Bio-indicators: An Approach for Wetland Water Quality Assessment of Rampur Ghol, Chitwan, Nepal

Journal of Institute of Science and Technology ◽

10.3126/jist.v19i2.13853 ◽

2015 ◽

Vol 19 (2) ◽

pp. 58-64

Author(s):

Birendra Gautam ◽

Rejina Maskey ◽

Ramesh Prasad Sapkota ◽

Dharma Raj Dangol

Keyword(s):

Water Quality ◽

Rainy Season ◽

Diversity Index ◽

Water Quality Assessment ◽

Class Ii ◽

Dry Season ◽

Class Iii ◽

Quality Class ◽

Evenness Index ◽

Index Value

The present research was conducted to study seasonal limnological parameters and record composition pattern of aquatic macro-invertebrates of the Rampur Ghol. GRS-BIOS/ASPT index was used to calculate the water quality class, Shannon Weiner diversity index (H’) and Piélou evenness index (e) were used to determine taxa richness of the macroinvertebrates. Altogether 281 individuals of 14 families and 313 individuals of 18 families were recorded in dry season and rainy season, respectively. Similarly, diversity index and evenness index values were recorded 0.98 and 0.85 in dry season; 1.075 and 0.86 in rainy season. On the basis of different aquatic macro-invertebrates, GRS-BIOS/ASPT Index value of four sampling sites fall in class II (moderately polluted), four sampling sites belong to water quality class IIIII (critically polluted) and remaining two sampling sites belong to water quality class III (heavily polluted). Similarly, in rainy season seven sites fall in water quality class II (moderately polluted) and three sampling sites belong to water quality class II-III (critically polluted).Journal of Institute of Science and Technology, 2014, 19(2): 58-64

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Spatio-Temporal Variations of Hydrochemical and Microbial Characteristics in Karst Water in Samcheok, South Korea

Water ◽

10.3390/w12123407 ◽

2020 ◽

Vol 12 (12) ◽

pp. 3407

Author(s):

Han-Sun Ryu ◽

Heejung Kim ◽

Jin-Yong Lee ◽

Jiwook Jang ◽

Sangwook Park

Keyword(s):

Water Quality ◽

Rainy Season ◽

Temporal Variations ◽

Dry Season ◽

Quality Analysis ◽

Dominant Factor ◽

Karst Water ◽

Seasonal Characteristics ◽

Microbial Characteristics ◽

Spatio Temporal

This study analyzed the hydrochemical characteristics and microbial communities of karst water in Samcheok, Korea, and compared water quality results to identify the seasonal characteristics and hydrogeological connectivity of the study areas of Hamaengbang-ri, Gyogok-ri, Yeosam-ri, and the downtown area of Samcheok. Field survey and water quality analysis were performed in July 2019, February 2020, and April 2020. Hydrochemical analysis of karst water (groundwater and surface water) showed that most samples were comprised of Ca-HCO3 and that water–rock interactions were a dominant factor compared to precipitation and evaporation (crystallization). For seasonal characteristics, water–rock interactions appeared more active in the dry season than in the rainy season. Calcite weathering was dominant in the dry season, whereas dolomite weathering dominated the rainy season. Moreover, the saturation indexes for the dry and rainy seasons were less than and greater than 0, respectively, corresponding to an unsaturation (oversaturation) state; thus, white precipitate distributed in the study areas was deposited in the rainy season. Finally, as a result of analyzing the hydraulic characteristics between regions, hydrogeological similarities were identified between Hamaengbang-ri and Yeosam-ri, and between Gyogok-ri and downtown Samcheok, which suggested hydrogeological connectivity between each of the pairs.

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ĐẶC ĐIỂM PHÂN BỐ CÁC MUỐI DINH DƯỠNG TRONG NƯỚC ĐẦM Ô LOAN, TỈNH PHÚ YÊN (2012-2014)

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/19/1/9632 ◽

2019 ◽

Vol 19 (1) ◽

pp. 57-66

Author(s):

Le Thi Vinh ◽

Nguyen Hong Thu ◽

Pham Huu Tam ◽

Le Trong Dung

Keyword(s):

Water Quality ◽

Rainy Season ◽

Average Concentration ◽

Dry Season ◽

Increasing Trend

The results of three surveys in the O Loan lagoon in the dry season (April 2013) and the rainy season (December 2012 and December 2014) showed that in the rainy season the average concentrations of nutrients in waters (ammonium: 76.8 μgN/l, nitrite: 13.9 μgN/l, nitrate: 55 μgN/l and silicate: 4021 μgSi/l) tended to be higher than those in the dry season (ammonium: 6.0 μgN/l, nitrite: 2.6 μgN/L, nitrate: 35 μgN/l and silicate: 1973 μgSi/l) while phosphate concentraiton did not differ between the two seasons with an average concentration of 66.8 μgP/l in rainy season and 60 μgP/L in dry season. By space, the concentrations of nutrients except nitrate in the lagoon, especially in the southern part, were usually higher than those in the canal connected to the sea. At O Loan lagoon waters, only ammonium (mainly in the southern part of the lagoon) and nitrate (mainly in the canal and southern part of the lagoon) concentrations were higher than the criteria values in the rainy season (December 2014) with pollution coefficient of about 1.2. However, the water quality of O Loan lagoon regarding nutrients always still needs to be monitored because from 1992 to the surveyed time, the concentrations of nutrients containing nitrogen and phosphate had the increasing trend in both seasons.

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Spatial arrangement of well and latrine and their influence on water quality in clayey soil – a study in low-income peri-urban neighborhoods in Lichinga, Mozambique

Journal of Water Sanitation and Hygiene for Development ◽

10.2166/washdev.2021.137 ◽

2021 ◽

Author(s):

Beni Jequicene Mussengue Chaúque ◽

Carlos Miguel Chicumbe ◽

Virgílio Carménia Cossa ◽

Marilise Brittes Rott

Keyword(s):

Water Quality ◽

Low Income ◽

Rainy Season ◽

Clayey Soil ◽

Spatial Arrangement ◽

Urban Neighborhoods ◽

Dry Season ◽

Fecal Coliforms ◽

Colony Forming Units ◽

Shallow Wells

Abstract In this study, the influence of the spatial arrangement of shallow wells and pit latrines on water quality was evaluated in clayey soil during dry and rainy seasons, using 123 randomly selected wells. The distance between well and the nearest latrine was measured and the location of the well in the yard was characterized. The colony forming units (CFU/100 mL) of fecal coliforms were quantified, and pH, electrical conductivity (CE) and turbidity were measured. 100% of the wells were located less than 25 m from the latrine, 74.8% were located in the middle of the yard. In the dry season, 42.4% of the samples presented up to 12 CFU/100 mL, and in the rainy season, 84.4% presented up to 139 CFU/100 mL. 56.9% had pH values between 6.5 and 8.5, and 63.4% presented EC values between 50 and 571 μS/cm. In the dry season, 40.7% of the samples had values below 5 NTU, and 59.3% up to 50 NTU. In the rainy season, 86.6% had values between 6 and 300 NTU. Pearson's correlation between all variables was weak. The wells are susceptible to high fecal contamination, although, the clayey soil seems to mitigate the expected high levels of microbial contamination.

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Heavy Metals Assessment of Abattoir Effluent on Surface Water Quality of River Katsina-Ala of Benue State, Nigeria

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.49.90 ◽

2015 ◽

Vol 49 ◽

pp. 90-98 ◽

Cited By ~ 2

Author(s):

Addy Jose Vershima ◽

Kabough Jonathan Terkimbi ◽

Azua Terese ◽

Aliyu Ibrahim

Keyword(s):

Heavy Metals ◽

Water Quality ◽

Heavy Metal ◽

Surface Water ◽

Rainy Season ◽

Metal Content ◽

Surface Water Quality ◽

Dry Season ◽

Heavy Metal Content

Water samples of six sampling sites (two downstream, two abattoir sites and two upstream sites) were analyzed using standard methods to determined and assessed heavy metal content of abattoir effluent on surface water quality of River Katsina-Ala, Benue State, Nigeria for rainy and dry seasons. Rainy season heavy metals results were; Cr6+ (0.032+0.06mg/l); Mn2+ (0.16+0.034mg/l); Cu2+ (0.86 +0.46mg/l); Pb2+(0.006+0.002mg/;Cd2+(0.0023+0.004mg/l) and the dry season results were: Cr6+(0.028+0.007mg/l); Mn2+(0.07+0.05mg/l); Cu2+(0.85+0.16mg/l); Pb2+(0.0030+0.014mg/l); Cd2+(0.0021+0.012mg/). Most heavy metals for both seasons were within the maximum permissible limit set by Federal Ministry of Environment, Nigeria (1991). The mean concentrations of Zn2+(1.70+0.29 mg/l) for rainy season and Zn2+(1.33+0.23mg/l) dry season were above the control and standard safe limits of < 1mg/l FMEnv (1991) for surface water quality. There was no significance difference (p<0.05) between the means from upstream and downstream sites for both seasons; though significance difference (p<0.05) existed at the abattoir sites. River Katsina –ala is slightly polluted. Heavy metal content from effluents from abattoir contributed to upset the physicochemical balance of the river. Bioaccumulation and bio-magnification of heavy metals may occur from prolong usage of the river water for drinking. It is suggested that the abattoir effluent be treated before discharge into the river to reduce environmental and health hazards.

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Effects of white shrimp (Litopenaeus vannamei) and tilapia nilotica (Oreochromis niloticus var. Spring) in monoculture and co-culture systems on water quality variables and production in brackish low-salinity water earthen ponds during rainy and dry seasons

Spanish Journal of Agricultural Research ◽

10.5424/sjar/2019173-14938 ◽

2019 ◽

Vol 17 (3) ◽

pp. e0605

Author(s):

Jorge Juárez-Rosales ◽

Jesus T. Ponce-Palafox ◽

Alma D. Román-Gutierrez ◽

Elena M. Otazo-Sánchez ◽

Griselda Pulido-Flores ◽

...

Keyword(s):

Water Quality ◽

Litopenaeus Vannamei ◽

Oreochromis Niloticus ◽

Rainy Season ◽

Dry Season ◽

White Shrimp ◽

Water Quality Variables ◽

Randomized Design ◽

Tilapia Nilotica ◽

Earthen Ponds

Aim of study: To determine the effects of white shrimp (Litopenaeus vannamei) and tilapia nilotica (Oreochromis niloticus var. Spring) in monoculture and co-culture on water quality variables and production in earthen ponds during dry and rainy seasons.Area of study: A shrimp farm (total area 20 ha) at Chiripa, San Blas Nayarit, Northwest coast of Mexico (21° 37' 34.53 " N; 105° 18' 16.31" W).Material and methods: Two production cycles were performed in a completely randomized design consisting of two treatments and three replications each during rainy season (September-December) and dry season (February-May). Shrimp was the main crop and tilapia the secondary species.Main results: White shrimp (10 org/m2) can be co-cultured with Nile tilapia at a stocking high density (4 org/m2), leading to improved water quality and better utilization of nutrients in dry season than in rainy season. However, the shrimp’ highest weight was recorded in the tilapia-shrimp co-culture ponds during rainy season due to higher water temperature and better quality of live food. The mean individual weight, biomass and survival of the shrimp, in co-culture ponds were greater than those of the shrimp monoculture, in the two seasons studied.Research highlights: There was a trend towards greater concentration of nutrients in the water of the monoculture ponds and, lower dissolved oxygen and higher BOD5 in co-culture ponds in the dry season than in the rainy season.

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Seasonal variations of water quality at Doreri Gulf, Manokwari, West Papua

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/890/1/012007 ◽

2021 ◽

Vol 890 (1) ◽

pp. 012007

Author(s):

L Sembel ◽

D Setijawati ◽

D Yona ◽

Y Risjani

Keyword(s):

Water Quality ◽

Standard Deviation ◽

Seasonal Variations ◽

Coastal Waters ◽

Rainy Season ◽

Field Work ◽

Dry Season ◽

Low Concentrations ◽

Seasonal Factors ◽

West Papua

Abstract The character of Manokwari City’s coastal waters is strongly influenced by activity on the mainland. The degradation in Sawaibu Gulf’s water quality has an impact on water quality nearby, as well as the waters of the Field Work Center (BLK), Lemon Island, and Tanjung Manggewa, which is part of Doreri Gulf. The purpose of this study was to determine the water quality in Doreri Gulf according on location and season. In February-April (rainy season) and August-October (dry season) 2020, the research was carried out within Doreri Gulf, Manokwari, West Papua. Turbidity, salinity, pH, temperature, and dissolved oxygen are amongst the variables analyzed. Its statistical analyses were performed descriptively using standard deviation and ANCOVA to correlate seasons and locations. Temperature, DO, and pH were highest at location 2; salinity showed highest at location 3; and turbidity were highest at location 1. Low concentrations of DO, pH, and salinity were measured at location 1; temperature showed highest at location 3; and turbidity were highest at location 1. The dry season would have the highest temperature, DO, pH, and salinity concentrations, meanwhile the rainy season had enough highest turbidity. The study confirms that there are no variations in water quality between location of each variable and that seasonal factors comprise the majority of differences in water quality.

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Spatio-seasonal variation of water quality influenced by land use and land cover in Lake Muhazi

Scientific Reports ◽

10.1038/s41598-021-96633-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Edovia Dufatanye Umwali ◽

Alishir Kurban ◽

Alain Isabwe ◽

Richard Mind’je ◽

Hossein Azadi ◽

...

Keyword(s):

Water Quality ◽

Land Use ◽

Seasonal Variation ◽

Land Cover ◽

Rainy Season ◽

Quality Parameters ◽

Dry Season ◽

Sustainable Land Use ◽

Water Quality Parameters ◽

Strong Positive Correlation

AbstractUnderstanding the influence of land use/land cover (LULC) on water quality is pertinent to sustainable water management. This study aimed at assessing the spatio-seasonal variation of water quality in relation to land use types in Lake Muhazi, Rwanda. The National Sanitation Foundation Water Quality Index (NSF-WQI) was used to evaluate the anthropogenically-induced water quality changes. In addition to Principal Components Analysis (PCA), a Cluster Analysis (CA) was applied on 12-clustered sampling sites and the obtained NSF-WQI. Lastly, the Partial Least Squares Path Modelling (PLS-PM) was used to estimate the nexus between LULC, water quality parameters, and the obtained NSF-WQI. The results revealed a poor water quality status at the Mugorore and Butimba sites in the rainy season, then at Mugorore and Bwimiyange sites in the dry season. Furthermore, PCA displayed a sample dispersion based on seasonality while NSF-WQI’s CA hierarchy grouped the samples corresponding to LULC types. Finally, the PLS-PM returned a strong positive correlation (+ 0.831) between LULCs and water quality parameters in the rainy season but a negative correlation coefficient (− 0.542) in the dry season, with great influences of cropland on the water quality parameters. Overall, this study concludes that the lake is seasonally influenced by anthropogenic activities, suggesting sustainable land-use management decisions, such as the establishment and safeguarding protection belts in the lake vicinity.

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Quality Assessment of Drinking Well Water near Dumpsite at Ogidi-Oloje Ilorin, Kwara State, Nigeria

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v24i2.19 ◽

2020 ◽

Vol 24 (2) ◽

pp. 323-328

Author(s):

K.O. Yusuf ◽

I.B. Sadiku ◽

O.S. Abioye

Keyword(s):

Water Quality ◽

Drinking Water ◽

Physicochemical Properties ◽

Water Samples ◽

Rainy Season ◽

Dry Season ◽

Well Water ◽

Cadmium Lead ◽

And Control

This study was conducted to determine the quality of drinking well water near dumpsite at Ogidi-Oloje, Ilorin, Kwara State. Open wells near dumpsite could be polluted due to percolation of chemicals from the decomposition of refuse and scraps of electronic boards having potential of causing diseases to man. Most people at Ogidi-Oloje Ilorin depend on open wells near dumpsite for drinking water during dry season. Water samples were collected from seven open wells (W1 - W6) 9.2 - 18.2 m away from dumpsite and the control well W7 was 45.0 m away from the dumpsite. Physicochemical and bacteriological properties were determined from the water samples during dry season (March, 2019) and rainy season (July, 2019). Phosphate, Cadmium, Lead, Feacal coliform were not detected during dry season but only Feacal coliform was not detected in the water during rainy season. All the values of physicochemical properties of the water were within WHO permissible limits except Iron and Cadmium that above the limits which could cause diseases to mankind. Values of Iron during dry season for six well sources were 3.61, 4.02, 4.26, 3.25, 5.14 and 7.24 mg/L while values for rainy season and control were 0.715, 1.410, 0.650, 0.049, 0.780, 1.110 and 0.775 mg/L(control) but WHO limits is 0.03mg/L. Concentrations of Cadmium in the water during rainy season were 0.010, 0.015, 0.015, 0.020, 0.015, 0.015 and 0.02mg/L(control) but WHO limit is 0.003 mg/L. This study revealed that the water is suitable for consumption during dry season but unsuitable during rainy season. Keywords: well water quality, groundwater pollution, water diseases, dumpsite

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Application of GIS and Multi-Criteria Statistical Techniques in Assessing Water Quality in the Coastal Province of Vietnamese Mekong Delta

Applied Environmental Research ◽

10.35762/aer.2021.43.3.2 ◽

2021 ◽

pp. 17-33

Author(s):

Nguyen Thanh Giao ◽

Huynh Thi Hong Nhien

Keyword(s):

Water Quality ◽

Rainy Season ◽

Mekong Delta ◽

Surface Water Quality ◽

Water Quality Monitoring ◽

Temporal Analysis ◽

Dry Season ◽

Quality Monitoring ◽

Monitoring Data ◽

Coastal Province

The study was conducted to evaluate the quality and spatial distribution of surface water quality in Soc Trang, a coastal province using Geographic information system (GIS) and multivariate statistical analysis. Water monitoring data was collected from 19 sampling locations with 19 parameters were analyzed from February 2019 to August 2020. The results indicated that water quality was contaminated with organic matters, nutrients, coliforms and salinity. Water quality index (WQI=22–73) indicated that water quality was from poor to medium level. Cluster analysis (CA) classified 19 monitoring sites into 7 groups and 19 months into 3 seasons including rainy season, rainy season-early dry season, dry season-early rainy season. CA results showed that the location and frequency of water quality monitoring could be significantly reduced, saving up to 75% the monitoring costs. The maps of the polluted parameters (TSS, DO, BOD, COD, TOC, NH4+-N, NO2--N, Coliform, Fe, Cl-) illustrated that the areas located in the interior fields and near the sea had poorer water quality compared to the areas adjacent to the Hau River. The combination of multivariable statistics and GIS was very useful for spatial and temporal analysis of water quality monitoring data.

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