scholarly journals Ecological assessment of water quality in an urban river replenished with reclaimed water: the phytoplankton functional groups approach

2021 ◽  
Author(s):  
Liying Zhu ◽  
Yuanyuan Chen ◽  
Yawei Wang ◽  
Chunrong Wang ◽  
Yuansong Wei
Keyword(s):  
Water Quality ◽  
Reclaimed Water ◽  
Ecological Status ◽  
Ecological Assessment ◽  
Dry Season ◽  
Urban Rivers ◽  
Wet Season ◽  
The North ◽  
Phytoplankton Functional Groups

Abstract Comprehensive water quality assessment plays a vital role in decision making for the sustainable management of urban rivers, and thus the exploration of integrated ecological assessment methods for water quality has become a major requirement. This study assessed the water quality of the North Canal River on the basis of its ecological status using the phytoplankton functional groups (PFGs) approach. The river runs through the megacities of the Beijing-Tianjin-Hebei region in China, and is mainly replenished with reclaimed water. The results showed that the PFGs approach is much better for evaluating the water quality of urban rivers than the conventional physicochemical index method and phytoplankton diversity metrics, because the PFGs approach is more sensitive to the spatiotemporal variations in the water quality of urban rivers. The average Qr index, for ecological status estimation in rivers, based on the PFGs of the North Canal River was 3.30, indicating “good” water quality. In the dry season, the dominant PFG upstream was group D (Cyclotella spp.), whereas the major downstream PFGs had changed to group Y (Glenodinium spp., Cryptomonas ovata, and Cryptomonas erosa) and W1 (Euglena spp. and Gonium pectoral). While the dominant PFG throughout the river changed to TB: Melosira spp. in the wet season. The Qr at each site was one to two grades lower during the wet season than the dry season, indicating that water quality was worse in the wet than the dry season.

scholarly journals EVALUATING FUTURE WATER QUALITY OF URBAN RIVERS IN HANOI UNDER EFFECT OF URBANIZATION AND CLIMATE CHANGE - THE APPLICATION OF WEAP MODEL FOR CAU BAY RIVER

2020 ◽  
Vol 58 (3A) ◽  
pp. 195
Author(s):  
Lan Huong Nguyen ◽  
Viet Nga Thi Tran
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Treatment Plant ◽  
Dry Season ◽  
Capital City ◽  
Master Plan ◽  
Urban Rivers ◽  
Water Drainage ◽  
Wet Season

Every day, up to 750,000 cubic meters of wastewater in Hanoi metropolitan areas is discharged directly into rivers and lake, of which only 10% is treated to the Vietnamese standards. According to the water drainage development master plan for the capital city of Hanoi until 2030, the government aim at dealing with flooding and improve environmental sanitation for local residents. With respect to the baseline and Master plan implementation scenarios, this study evaluates the future water quality of urban rivers in Hanoi under the effect of urbanization and climate change using Water Evaluation And Planning tool (WEAP) and take the Cau Bay catchment as the case study. The result shows that, without implementation of wastewater treatment plant, the water quality of Cau Bay River will be worse with the DO in dry season is 0.2-1.2 mg/l and BOD is 52.0-55.0 mg/l. With the implementation of Master plan, the level of DO and BOD would be 7.1-7.3 mg/l and 7.0-13.8 mg/l respectively in the dry season whereas the values are 3.7 mgO/l and 36.1-41.8 mg/l in the wet season. The degradation of wastewater during the wet season is results from the combine- overflow sewage system as designed in the master plan.

scholarly journals Environmental assessment of water quality in various lakes of the Volyn region, which is intensively used in recreation

2020 ◽  
Keyword(s):  
Water Quality ◽  
Environmental Assessment ◽  
Ecological Status ◽  
Ecological Assessment ◽  
Limiting Factors ◽  
Practical Significance ◽  
High Quality ◽  
Ecological Index ◽  
Quality Of Water

Introduction. Assessment of the ecological status of lakes is important for their conservation and protection. Many lakes are intensively used in recreation in Volyn Region. The development of the resort and recreational facilities requires significant additional volumes of fresh water to maintain the depth of the reservoirs in the bathing area, certain sanitary and temperature regimes of the reservoirs. The limiting factors are the sanitary and hygienic indicators of water. First and foremost, high quality of water should be provided for the organization of contact types of recreation (bathing, diving, water skiing, etc.). The purpose of article. The purpose of the article is ecological assessment of water quality in various lakes of Volyn Region, which are most intensively used in recreation. Methods. Research methods are expeditionary, methods of mathematical statistics and environmental assessment of water quality, which were carried out in accordance with the methodology for assessing the quality of surface water in the respective categories. During the preparation of the article, materials from their own expeditionary studies of the natural-economic state of the lakes were used, as well as the results of chemical analysis of the water composition conducted by the Water and Soil Monitoring Laboratory of the Regional Water Resources Office in Volyn Region and the Complex Laboratory for Observation of the Environmental Environmental Center. Results. The analysis of the qualitative indicators of the lakes Svitiaz, Velyke Zgoranske and Somyn showed the high quality of water in the lakes. For the period of 2015–2019, water quality was classified as „good” class II, by degree of cleanliness „clean”, by category as „very good”, by degree of cleanliness „clean” on all lakes. The value of IE for the Lake Velyke Zgoranske varied in the range of 1.81–2.44, in the range of 1.66–2.07 for the Lake Svitiaz, and in the range of 2.56–2.96 for the Lake Somyn. Index І2 (ecological and sanitary indicators) has the most influence on the magnitude of the ecological index of water quality. The scientific novelty lies in establishing block and integral indexes of ecological assessment of water quality, classes and categories of water quality of the most recreationally-developed lakes of Volyn Region, as well as in assessment of the dynamics of indicators of water quality of lakes during the years of 2015–19. Practical significance is defined with the opportunity of development of a set of measures for the rational use and protection of lakes.

scholarly journals Assessment of heavy metal and physico-chemical pollution loadings of River Benue water at Makurdi using water quality index (WQI) and multivariate statistics

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Raphael Terungwa Iwar ◽  
Joseph Terlumun Utsev ◽  
Martina Hassan
Keyword(s):  
Water Quality ◽  
Heavy Metal ◽  
Water Quality Index ◽  
Quality Index ◽  
Dry Season ◽  
Pollution Monitoring ◽  
Total Variance ◽  
Wet Season ◽  
Physico Chemical

AbstractIn this work, the quality of River Benue water at Makurdi was assessed for its heavy metal load alongside seven other physico-chemical parameters using water quality index (WQI) and multivariate statistical tools. A total of 45 samples from three (3) different points along the River course were collected for five months (October 2018–May, 2019) spanning the dry and wet seasons. Samples were analysed  in accordance with standard methods. Most of the parameters evaluated were found to fall in the allowable limits of the World Health Organization (WHO) among others, except for colour, turbidity, total suspended solids, nickel, lead and cadmium. WQI analysis using the BISWQI, OWQI and CCMEWQI indicated that all indexing methods were suitable for estimating the WQI of River Benue as they all showed that the water corresponded to the classification as “poor water”. Heavy metal index of the river ranged from13.40–6080.00 and from 47.07–7240.00 for the dry and wet seasons, respectively, and was majorly influenced by high cadmium and lead pollution levels. Principal component analysis (PCA) revealed three rotated factor with respective communality levels for both the dry and wet seasons. Factor 1 was positively loaded with nine parameters which accounted for 32.3% of the total variance during the dry season, while it was positively loaded with 10 parameters in the wet season accounting for 25.9% of total variance. Hierarchical cluster analysis (HCA) revealed that the river was zoned into four clusters each for both dry and wet seasons. Sampling points 2 and 3 were the most polluted during the dry season, while sampling point 1 was found to be the most polluted in the wet season. It was concluded that the increasing and diverse nature of anthropogenic activities on the river course was responsible for the deteriorating quality of the water. The study recommended continuous pollution monitoring and local regulations to reduce the entrance of both diffuse and point source pollution into the river.

scholarly journals Benthic macroinvertebrates diversity as bioindicators of water quality of Nasarawa Reservoir Katsina State Nigeria

2020 ◽  
Vol 12 (1) ◽  
pp. 449-456
Author(s):  
Zahraddeen Hassan Yusuf
Keyword(s):  
Water Quality ◽  
Benthic Macroinvertebrates ◽  
Working Party ◽  
Dry Season ◽  
Wet Season ◽  
Quality Of Water ◽  
Physico Chemical ◽  
Invertebrate Population ◽  
Number Of Individuals

This study was carried out to assess the water quality of Nasarawa using benthic macroinvertebrates as bioindicators. Biological monitoring working party (BMWP) scoring system was the index used to assess the ecosystem health of Nasarawa reservoir. A total of 4460 macrobenthic invertebrate comprising three phyla, three classes, six families and seventeen species were recorded. The overall macrobenthic population at the different stations revealed that the study area was dominated by Mollusca (41.18%), Oligochaetae (23.53%), Coleoptera and Diptera (11.77%), Mollusca (29.06%), Ephemerophtera and Odonata (5.89%). (BMWP) score of 65.7 was obtained for Nasarawa reservoir which classifies the reservoir as moderately polluted. Higher BMWP score of 65.7 was recorded in the wet season compared to the dry season value of 58.7. More macrobenthic invertebrate population was recorded in the dry season than in the wet season in Nasarawa reservoir. Simpson (1-D), Shannon (H) and evenness were higher during the dry season than in the wet season but dominance was higher in the wet season. Species richness as revealed by the Margaleff and Menhinick index was higher during the wet season than in the dry season. The variations in taxa and number of individuals during the months of sampling was not significantly different (P>0.05). It was found that agricultural activities, washing and bathing could alter physico-chemical parameters of the stream and hence changing the abundance of macroinvertebrates as well as the quality of water. This study, therefore, recommends that the source of pollutants should be controlled and the stream regularly monitored by the relevant authorities. Keywords: Benthic macroinvertebrates, Bioindicator, Water quality, Reservoir

scholarly journals ECOLOGICAL ASSESSMENT OF SURFACE WATER QUALITY OF ROSTAVYTSIA RIVER

2020 ◽  
pp. 86-92
Author(s):  
Pavlo Smilii ◽  
Mykhailo Melniychuk
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Quality Indicators ◽  
Environmental Assessment ◽  
Surface Waters ◽  
Ecological Status ◽  
Surface Water Quality ◽  
Ecological Assessment ◽  
Salt Composition

Purpose – perform ecological assessment of the surface waters of the Rostavytsia river within the Zhytomyr region. Method. Environmental assessment of the surface water of the Rostavytsia river was carried out using the system of classification of standards for the assessment of surface water quality of Ukraine. On the basis of common environmental criteria, the methodology makes it possible to compare the quality of water at different sites of water bodies, in water bodies of different regions. The calculation of the ecological assessment of water quality was carried out within three blocks: block of salt composition (І1), block of trophic-saprobiological (ecological-sanitary) indicators (І2) and block of indicators of content of specific substances of toxic action (І3). The results are presented in the form of a combined environmental assessment based on the final conclusions of the three blocks and based on the calculation of the integrated environmental index (IE). Results. Omprehensive studies on changing the water quality of the Rostavytsia river were conducted within the Zhytomyr region during 2016-2017. The water quality of the river according to the final values of the integral indicators of water quality of the three blocks varies within the II and III quality classes. The total environmental indices (IE) for the mean and worst indices are 3,2 and 3,3 respectively. In general, the water quality along the main channel of the Rostavytsia river within the Zhytomyr region corresponds to the second class, 3 categories, 3 subcategories according to the average quality indicators and 3(4) subcategories by worst performance. The total values of the integral surface water quality indicators of the Rostavytsia river indicate their contamination by trophic-saprobiological components. Scientific novelty. For the first time, on the basis of analytical studies and stock materials, an ecological assessment of the surface waters of the Rostavytsia river within the Zhytomyr region was carried out by three blocks of indicators: salt composition, trophic-saprobiological indicators and specific toxic substances. The integral ecological index is determined. The trends of pollutants accumulation in the surface waters of the Rostavytsia river have been established. Practical significance. The conducted researches allowed to analyze and evaluate the ecological status of the surface waters of the Rostavytsia river within the Zhytomyr region, which will allow to establish ecological standards of water quality and on this basis to determine the main directions for improvement of water resources and to substantiate the system of recommendations aimed at improving the ecological status of the studied basin.

Water quality assessment of the river Buriganga, Bangladesh

2018 ◽  
Vol 4 (1) ◽  
pp. 47-54 ◽  
Author(s):  
K Fatema ◽  
M Begum ◽  
M Al Zahid ◽  
ME Hossain
Keyword(s):  
Water Quality ◽  
Water Quality Assessment ◽  
Quality Parameters ◽  
Dry Season ◽  
River Ecosystem ◽  
Wet Season ◽  
Different Seasons ◽  
Water Quality Status ◽  
Quality Status

The present investigation was conducted to assess the water quality status of the river Buriganga. Water samples were collected from three selected stations in wet (June-August) and dry (November-January) seasons during the years 2017 and 2018. Temperature and Dissolved Oxygen (DO) of water varied from 22.80 to 31.40 °C and 0.22 to 2.74 mg/L, respectively. Electrical conductivity of water varied from 180 to 598 μS/cm while pH ranged from 7.61 to 8.97. This study showed that temperature, DO and Fe were higher in wet season than in the dry season, whereas pH, conductivity and phosphate were higher in dry season than in the wet season. But manganese did not vary in different seasons. It is found that the differences of water quality parameters were significant in seasons (p<0.05) except for Fe and insignificant for stations (p>0.05) except for DO. The results reveal that there were significant differences between sampling seasons (wet and dry) (p<0.05) except for temperature and manganese. A significant correlation (p<0.01) was also found among temperature and other parameters viz. DO, conductivity, pH, phosphate. According to the result obtained in the present study, it may be said that the water quality of the river Buriganga is not acceptable to declare the river-ecosystem as a sound one ecologically.J. Biodivers. Conserv. Bioresour. Manag. 2018, 4(1): 47-54

EFFECT OF GREEN ROOF AGE ON RUNOFF WATER QUALITY IN PORTLAND, OREGON

2018 ◽  
Vol 13 (2) ◽  
pp. 42-54 ◽  
Author(s):  
Jarrett Okita ◽  
Cara Poor ◽  
Jessica M. Kleiss ◽  
Ted Eckmann
Keyword(s):  
Water Quality ◽  
Urban Areas ◽  
Water Retention ◽  
Green Roof ◽  
Green Roofs ◽  
Dry Season ◽  
Rain Event ◽  
Wet Season ◽  
Runoff Water

Green roofs have become a common method to increase water retention on-site in urban areas. However, the long-term water quality of runoff from green roofs is poorly understood. This study evaluated the water quality of stormwater runoff from a regular (non-vegetated) roof, a green roof installed 6 months previously, and a green roof installed 6 years ago in Portland, Oregon. Samples of runoff were taken during every rain event for 10 months, and analyzed for total phosphorus (TP), phosphate (PO3-4), total nitrogen (TN), nitrate (NO-3), ammonia (NH3), copper (Cu), and zinc (Zn). Runoff from the green roofs had higher concentrations of TP and PO3-4 and lower concentrations of Zn compared to the regular roof. Average TP concentrations from the 6-year old roof and 6-month old roof were 6.3 and 14.6 times higher, respectively, than concentrations from the regular roof, and average PO3-4 concentrations from the 6-year old roof and 6-month old roof were 13.5 and 26.6 times higher, respectively, compared to the regular roof. Runoff from the 6-month old green roof had higher concentrations of TP and PO3-4 than the 6-year old green roof during the wet season, but lower concentrations during the dry season. The 6-month old green roof installations where receiving waters are sensitive or impaired may need additional treatment methods to reduce phosphorus levels. As green roofs age, water retention decreases and phosphorus leaching increases during the dry season.

scholarly journals Water quality assessment and spatial–temporal variation analysis in Erhai lake, southwest China

2021 ◽  
Vol 13 (1) ◽  
pp. 1643-1655
Author(s):  
Xuekai Chen ◽  
Xiaobo Liu ◽  
Bogen Li ◽  
Wenqi Peng ◽  
Fei Dong ◽  
...  
Keyword(s):  
Water Quality ◽  
Temporal Variation ◽  
Dry Season ◽  
Quality Data ◽  
Erhai Lake ◽  
Wet Season ◽  
Northern Area ◽  
Southern Area ◽  
Better Than

Abstract For the implementation of lake ecological protection, understanding the water pollution status and spatio–temporal variation of water quality has become the most important thing for water safety in the basin. To analyze the water quality in recent years, water quality data in Erhai lake from 2013 to 2017 were first collected from typical nine monitoring stations. Based on the comprehensive water quality index (WQI) method, the temporal and spatial variation characteristics of water quality in Erhai lake were analyzed, and the main factors affecting water quality in Erhai lake were explored. The results indicated that the water quality of Erhai lake was worse than its target water quality, and total nitrogen (TN) and total phosphorus (TP) exceeded the Class Ⅱ standards (TN: 0.5 mg L−1, TP: 0.025 mg L−1) of China’s Environmental Quality Standard for Surface Water (GB3838-2002). In terms of changes across seasons, the overall lake water quality in the dry season was better than that in the wet season, and TN and TP reached the peak value in September. In terms of spatial distribution, water quality of the northern area was better than that of the southern area in the dry season, whereas water quality of the southern area was better than that of the northern area in the wet season. At present, Erhai lake is at a critical turning point of water eutrophication, and its nutrition status is mainly affected by both nitrogen and phosphorus. The pollution load from the land area is the main factor affecting the deterioration of Erhai lake. Our results can provide a scientific basis for the treatment of the water environment of Erhai lake.

scholarly journals ECOLOGICAL ASSESSMENT OF THE SURFACE WATER QUALITY OF THE GUYVA RIVER

2020 ◽  
pp. 52-57
Author(s):  
Pavlo Smilii
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Quality Indicators ◽  
Environmental Assessment ◽  
Surface Waters ◽  
Ecological Status ◽  
Surface Water Quality ◽  
Ecological Assessment ◽  
Salt Composition

Method. Environmental assessment of the surface water of the Guyva River was carried out using the system of classification of standards for the assessment of surface water quality of Ukraine. On the basis of common environmental criteria, the methodology makes it possible to compare the quality of water at different sites of water bodies, in water bodies of different regions. The calculation of the ecological assessment of water quality was carried out within three blocks: block of salt composition (І1), block of trophic-saprobiological (ecological-sanitary) indicators (І2) and block of indicators of content of specific substances of toxic action (І3). The results are presented in the form of a combined environmental assessment based on the final conclusions of the three blocks and based on the calculation of the integrated environmental index (IE). Results. omprehensive studies on changing the water quality of the Guyva River were conducted within the Zhytomyr region during 2016-2017. The water quality of the river according to the final values of the integral indicators of water quality of the three blocks varies within the II and III quality classes. The total environmental indices (IEs) for the mean and worst indices are 2,9 and 3,1 respectively. In general, the water quality along the main channel of the Guyva River within the Zhytomyr region corresponds to the second class, 3 categories, 3(2) subcategories according to the average quality indicators (in the state of "good" with a slope to "very good", in terms of purity bias to "clean") and 3 subcategories by worst performance (good for good, clean enough). The total values of the integral surface water quality indicators of the Guyva River indicate their contamination by trophic-saprobiological components. Scientific novelty. For the first time, on the basis of analytical studies and stock materials, an ecological assessment of the surface waters of the Guyva River within the Zhytomyr region was carried out by three blocks of indicators: salt composition, trophic-saprobiological indicators and specific toxic substances. The integral ecological index is determined. The trends of pollutants accumulation in the surface waters of the River Guyva have been established. Practical significance. The conducted researches allowed to analyze and evaluate the ecological status of the surface waters of the Guyva River within the Zhytomyr region, which will allow to establish ecological standards of water quality and on this basis to determine the main directions for improvement of water resources and to substantiate the system of recommendations aimed at improving the ecological status of the studied basin.

Sign in / Sign up

Export Citation Format

Share Document