scholarly journals Water quality in Lake Xochimilco, Mexico: zooplankton indicators and Vibrio cholerae

2015 ◽  
Author(s):  
Sarma Nandini ◽  
Pedro Ramirez García ◽  
S.S.S. Sarma
Keyword(s):  
Water Quality ◽  
Vibrio Cholerae ◽  
Chlorophyll A ◽  
Local Population ◽  
Secchi Depth ◽  
Treatment Plant ◽  
Nitrogen And Phosphorus ◽  
Physico Chemical ◽  
Eutrophic Water ◽  
Depth Water

<p>Lake Xochimilco is a eutrophic water body in Mexico City used by the local population for aquaculture and agriculture. Water level is maintained with inputs of partially treated waste water from the Cerro de la Estrella treatment plant. In this study we analysed the water quality at two sites of Lake Xochimilco, Lake Xaltocan and the Santa Cruz Canal using various indicators such as zooplankton diversity, saprobic indices, bacterial concentrations and physico-chemical variables. Eighty litres of water was filtered from Lake Xochimilco from each site, once a month from March to October of 2012, and the rotifers, cladocerans and copepods were enumerated and identified. Physico-chemical parameters such as temperature, pH, Secchi depth, water depth, nitrogen and phosphorus and chlorophyll a concentrations, and bacterial densities were measured. During the study we recorded 33 species of rotifers, the most abundant being <em>Brachionus angularis</em>, <em>B. calyciflorus</em> and <em>B. havanaensis</em>.  Among the microcrustaceans the most abundant were the cladoceran <em>Moina micrura</em> and the copepods <em>Acanthocyclops americanus</em> and <em>Arctodiaptomus dorsalis</em>. The species diversity was around 2 bits/ind. and the saprobic index between 1.5-2.0, indicating that both sites were β meso-saprobic.  At both sites nitrogen was &lt;1 mg/L and phosphorus ranged between 2.5-7.8 mg/L. Chlorophyll a concentrations were between 66-136 µg/L. The toxigenic (<em>Vibrio cholerae </em>No-O1/No-O139) and the non-toxigenic (<em>Vibrio cholerae </em>No-O135) strains of the bacterium were recorded, closely associated with littoral rotifers and cladocerans particularly <em>Brachionus quadridentatus</em> and  <em>Alona</em> sp. All variables indicate that these sites in Lake Xochimilco are eutrophic and highly contaminated and that the water quality needs to be improved.<strong></strong></p>

scholarly journals Assessment of Anthropogenic Impact of Surface Water Quality, South Africa

2018 ◽  
Vol 6 (2) ◽  
pp. 12
Author(s):  
Dipitseng Manamela ◽  
Omotayo Awofolu
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Surface Water ◽  
Anthropogenic Activities ◽  
Treatment Plant ◽  
Surface Water Quality ◽  
Total Coliform ◽  
Mean Values ◽  
Physico Chemical ◽  
The Impact

This article investigates the impact of anthropogenic activities on an important surface water from physico-chemical, chemical and microbial perspectives. The surface water, referred to as Blesbokspruit is in the West Rand District of South Africa. Potential impactors include wastewater treatment plant, mines, farmlands and informal settlements. Water samples were collected from nine purposively selected sampling points and analysed in 2014. The mean values of analysed variables across sampling sites and periods ranged from pH: 7.4-8.4; EC: 93.0 - 146.6 mS/m; TSS: 11.3 – 39.0 mg/L; TDS: 590.3 - 1020.3 mg/L; COD: 15.6- 34.8 mg/L. Those for anions varied from NO3-: 0.2- 2.1 (mg/L) N; PO43- : 0.4-0.9 mg/L and SO42-: 118.6 - 379.5 mg/L. The metallic variables ranged from As: 0.01-0.06 mg/L; Cd: 0.02-0.06 mg/L; Fe: 0.04-0.73 mg/L; Cu: 0.02 – 0.05 mg/L and Zn: 0.05 – 0.15 mg/L. The Faecal coliform varied from 15.9-16878.5 cfu/100 ml; Total coliform: 92.9-430294 cfu/100 ml and HPC from 4322.5-39776 cfu/1ml. Detection of toxic metals and pathogenic organisms above target safety limits indicate unsuitability of the water for domestic use with impact on the health of aquatic ecosystem. The study generally revealed the impact of anthropogenic activities on the surface water quality.

The Effect of Land Use on Water Quality in Lam Takong Basin, Nakhon Ratchasima Province, Thailand

2014 ◽  
Vol 1030-1032 ◽  
pp. 641-647 ◽  
Author(s):  
Glinsukol Suwannarat ◽  
Pongthep Suwanwaree
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Surface Water ◽  
Chlorophyll A ◽  
Water Body ◽  
Treatment Plant ◽  
Water Quality Assessment ◽  
Industrial Area ◽  
Dry Season ◽  
Septic Tank

The water quality assessment of Lam Takong River and tributaries, from 20 stations, 6 times (October and December, 2008; February, April, June and August, 2009), revealed that overall water quality was in class 3 of Thailand surface water standard, except NH3-N, P and BOD. The maximum of NH3-N (12.6 mg/L), Phosphate 2.7 mg/L and BOD (8.7 mg/L) were found at Quartermaster Department Royal Thai Army Bridge, Nakhon Ratchasima Municipality pump in Lam Takong reservoir and Ban Ta Krasang, respectively, causing class 4 surface water standard in these areas. Moreover, trophic level of Lam Ta Khong River was mesotrophic; except they were meso-eutrophic after passing through Nakhon Ratchasima Municipality, Ban Ta Krasung, and Kan Pom dam before reaching Mool River. The season also affected on water quality. The value of pH, DO, BOD and NH3-N were significantly higher in dry season (p<0.01), while temperature, salinity and TSS were significantly lower in dry season (p<0.01). However, turbidity, TOC, NO3, NO2 and Chlorophyll-a in rainy season were higher than dry season but not statistically different. Pearson’s Correlation of 9 land use types on water quality showed that urban area was correlated with BOD, DO, NH3-N, PO4 and Chlorophyll-a (0.425, 0.380, -0.259, 0.445, and 0.339, respectively) higher than industrial area, scrub forest and water body. However, nitrate was mostly correlated with water body. Later, statistical models were developed from these results. WAPS was used to predict water quality in Lam Takong River. Three scenarios (present, 10 years, and 10 years with 25% BOD reduction) were simulated. The model predicts that water quality still decreases when flow through Nakhon Ratchasima Municipality. The minimum DO would reach 1 mg/L in ten years. However, if 25% BOD are reduced by future wastewater treatment plant and septic tank construction, the minimum DO would be 2.75 mg/L.

Nanofiltration: improvements of water quality in a large distribution system

2003 ◽  
Vol 3 (1-2) ◽  
pp. 193-200 ◽  
Author(s):  
S. Peltier ◽  
M. Cotte ◽  
D. Gatel ◽  
L. Herremans ◽  
J. Cavard
Keyword(s):  
Water Quality ◽  
Distribution System ◽  
Treatment Plant ◽  
System A ◽  
Physico Chemical ◽  
Before And After ◽  
Doc Concentration ◽  
Improved Stability ◽  
Microbiological Water Quality ◽  
Large Distribution

A nanofiltration (NF) treatment was introduced during the autumn of 1999 in the Méry-sur-Oise treatment plant which feeds the northern Parisian suburbs distribution system. A study was conducted over 4 years to compare the water quality before and after nanofiltration. The results confirmed that NF treatment produced a low DOC concentration in water (average 0.7 mg C/L). This reduction of DOC concentration levels enabled an improved stability of chlorine residual that has been reduced to 0.2 mg/L at the outlet of the plant. The formation of trihalomethanes was thus reduced by 50% in the network. Moreover, the reduction of BDOC enabled an improved biological stability in the water and enhanced the microbiological water quality during distribution. In addition, the NF treatment enhanced the physico-chemical water quality.

scholarly journals Estimation of chlorophyll-a concentration using Landsat 8 in the Cassaffousth reservoir

2019 ◽  
Vol 19 (7) ◽  
pp. 2021-2027 ◽  
Author(s):  
María Micaela Ledesma ◽  
Matías Bonansea ◽  
Claudia Rosa Ledesma ◽  
Claudia Rodríguez ◽  
Joel Carreño ◽  
...  
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Field Data ◽  
Warning System ◽  
Landsat 8 ◽  
Chl A ◽  
Physico Chemical ◽  
Regression Techniques ◽  
Remote Sensing Techniques

Abstract The physico-chemical and biological composition of a reservoir's effluents directly influences water quality. The values of variables such as high values of concentrations of chlorophyll-a (Chl-a) are indicators of pollution. The objective of this work was to monitor the trophic status and water quality of the Cassaffousth reservoir (Córdoba, Argentina) through the development of statistical models based on field data and satellite information. During 2016 and 2017, samples were taken bimonthly. Seven sampling sites were selected and physico-chemical and biological parameters were assessed. By using regression techniques, Landsat 8 information was related with field data to construct and validate a statistical model to determine the distribution of Chl-a in the reservoir (R2 = 0.87). The generated algorithm was used to generate maps which contained information about the dynamics of Chl-a in the entire reservoir. Remote sensing techniques can be used to expand the knowledge of the dynamics of the Cassaffousth reservoir. Moreover, these techniques can be used as baselines for the development of an early warning system for this and other reservoirs in the region.

Correlation of Water Quality Parameters in Tolo Harbour, Hong Kong

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2555-2558 ◽  
Author(s):  
K. W. Chau ◽  
Y. S. Sin
Keyword(s):  
Water Quality ◽  
Hong Kong ◽  
Chlorophyll A ◽  
Secchi Depth ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Phosphorus Concentration ◽  
Control Zone ◽  
Chlorophyll A Concentration ◽  
Tolo Harbour

In this paper, long-term biweekly measurements on the various water quality parameters in Tolo Harbour from year 1982 to 1990, subsequent to the declaration of the area as water control zone, were analyzed and correlated. Correlations have been demonstrated between surface chlorophyll-a concentration with secchi depth and with total nitrogen concentration (TN) in the three sub-zones of Tolo Harbour in Hong Kong with different water quality objectives. The correlation between chlorophyll-a concentration and total phosphorus concentration (TP) is less significant which can be explained by the TN/TP ratio. The correlations are useful for water management, planning and effective pollution control on the land-locked estuary.

Defining physico-chemical variables, chlorophyll-a and Secchi depth reference conditions in northeast eco-region lakes, China

2013 ◽  
Vol 71 (3) ◽  
pp. 995-1005 ◽  
Author(s):  
Shouliang Huo ◽  
Beidou Xi ◽  
Jing Su ◽  
Zhuoshi He ◽  
Fengyu Zan ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Secchi Depth ◽  
Reference Conditions ◽  
Physico Chemical

scholarly journals STUDY OF WATER QUALITY AND ITS HEALTH EFFECTS DUE TO INDUSTRIALIZATION IN NOAPARA AND CHHATIAIN UNION OF HABIGANJ, BANGLADESH

2020 ◽  
Vol 32 (3) ◽  
Author(s):  
Tanje Un Jenat ◽  
Md. Tariqul Islam ◽  
Md. Jahir Bin Alam
Keyword(s):  
Water Quality ◽  
Chemical Analysis ◽  
Health Effects ◽  
Water Samples ◽  
Treatment Plant ◽  
Health Problems ◽  
Dermal Absorption ◽  
Dry Period ◽  
Physico Chemical

In this paper, an attempt has been taken to assess the water quality and its impact on local inhabitants along with their health problems due to industrialization without treatment plant in Noapara and Chhatiain Union of Habiganj. To assess the water quality, physico-chemical analysis of water was carried out based on their importance in different usage. Water samples of different locations have DO in the ranges of 2.1mg/l to 9.8mg/l. According to WQI, during dry period, about 42% water samples are ranked as “Unsuitable” whereas 28.5% as “Excellent” during monsoon.CDI value from dermal absorption was evaluated using USEPA guidelines and found the highest amount as 140mg and 150mg for children and adult respectively for only elements related with nitrate and ammonia.

Water quality characteristics of Densu River basin in south-east Ghana

2010 ◽  
Vol 61 (6) ◽  
pp. 1467-1477 ◽  
Author(s):  
J. Amoako ◽  
A. Y. Karikari ◽  
O. D. Ansa-Asare ◽  
E. Adu-Ofori
Keyword(s):  
Water Quality ◽  
Sea Water ◽  
Background Level ◽  
Water Quality Monitoring ◽  
Natural Background ◽  
Nitrogen And Phosphorus ◽  
Background Values ◽  
Physico Chemical ◽  
Ph Range ◽  
Dominance Pattern

Water quality of the Densu River was studied by determining the levels of various physico-chemical parameters including trace metals for planning of the basin. The pH range (7.40–8.22) fell within the natural background level 6.5–8.5. The river was moderately hard with high turbidity due to poor farming practices, which result in large quantities of topsoil ending up in the river after rains. The river waters were well oxygenated with a mean DO concentration of 6.3 mg/l. Nitrogen and phosphorus levels were below their natural background values. The Densu River showed an overall ionic dominance pattern of Na &gt; Ca  &gt; K &gt; Mg and Cl &gt; HCO3 &gt; SO4, a pattern which is an intermediate between fresh and sea water systems. The mean concentrations of metals for the basin followed the order: Fe &gt; Mn &gt; Zn &gt; Pb &gt; Cu &gt; Cd. 84.6% of the sampling sites exceeded the background values of 0.3 mg/l and 0.1 mg/l for Fe and Mn respectively. Other metals Zn, Pb, Cu and Cd were all below their background levels indicating the river is unpolluted with respect to these metals. Water Quality index performed on the data depicted that River Densu is of poor to fairly good water quality. Regular water quality monitoring is recommended.

Spatial and temporal variations of water quality in an artificial urban river receiving WWTP effluent in South China

2015 ◽  
Vol 73 (6) ◽  
pp. 1243-1252 ◽  
Author(s):  
Di Zhang ◽  
Yi Tao ◽  
Xiaoning Liu ◽  
Kuiyu Zhou ◽  
Zhenghao Yuan ◽  
...  
Keyword(s):  
Water Quality ◽  
Reclaimed Water ◽  
Treatment Plant ◽  
Organic Pollution ◽  
Temporal Variations ◽  
Urban River ◽  
Spatial And Temporal Variations ◽  
Pollution Load ◽  
Nitrogen And Phosphorus ◽  
Wwtp Effluent

Urban wastewater treatment plant (WWTP) effluent as reclaimed water provides an alternative water resource for urban rivers and effluent will pose a significant influence on the water quality of rivers. The objective of this study was to investigate the spatial and temporal variations of water quality in XZ River, an artificial urban river in Shenzhen city, Guangdong Province, China, after receiving reclaimed water from WWTP effluent. The water samples were collected monthly at different sites of XZ River from April 2013 to September 2014. Multivariate statistical techniques and a box-plot were used to assess the variations of water quality and to identify the main pollution factor. The results showed the input of WWTP effluent could effectively increase dissolved oxygen, decrease turbidity, phosphorus load and organic pollution load of XZ River. However, total nitrogen and nitrate pollution loads were found to remain at higher levels after receiving reclaimed water, which might aggravate eutrophication status of XZ River. Organic pollution load exhibited the lowest value on the 750 m downstream of XZ River, while turbidity and nutrient load showed the lowest values on the 2,300 m downstream. There was a higher load of nitrogen and phosphorus pollution in the dry season and at the beginning of wet season.

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