scholarly journals Characterization of Pond Water Chemistry and Its Potability Status at South-West Coastal Region of Bangladesh

2018 ◽  
Vol 44 (2) ◽  
pp. 159-171
Author(s):  
SK Saha ◽  
Aminur Rahman ◽  
Krishna Rani Barai
Keyword(s):  
Water Chemistry ◽  
Source Rock ◽  
Rainwater Harvesting ◽  
Sea Water ◽  
Coastal Region ◽  
Pond Water ◽  
Chemical Constituent ◽  
Management Options ◽  
Water Pond ◽  
Source Rock Evaluation

Dacope Upazilla under Khulna district is one of the most affected safe water scarcity regions like any other part of southwest coastal region of Bangladesh. The demands for drinking and cooking water in the area are mostly met from rainwater harvesting and pond water. Pond water from different stations of Dacope Upazilla was analyzed for assessing the water chemistry, source rock evaluation and its potability status. Thirty one samples were collected by purposive sampling and analyzed following standard methods. The analysis reveals that the cations and anions of the ground water showed the order of abundance as Na+> Mg++>Ca++>K+ and Cl->SO4 -->HCO3 - , respectively. Source rock deduction suggests that the water is mostly carbonate weathering of sea water or brine intrusion. Piper diagram suggests that the water is in saline condition. Ionic ratios also justify the aforesaid relations. The chemical constituent of water is (Na++K+) and (Cl- +HCO3 -) type influenced by sea water, however, ponds are in transition zone influenced by tide. With reference to Bangladesh and WHO standards the research states that most pond water do not satisfy the potable quality, therefore management options need to be formulated for further exploitation. Asiat. Soc. Bangladesh, Sci. 44(2): 159-171, December 2018

Evaluation of a Reverse Osmosis Apparatus for Field Production of USP Grade Injectable Water from Sea Water, Pond Water, and Human Urine

1980 ◽  
Vol 145 (12) ◽  
pp. 831-835
Author(s):  
Frank DeVenuto ◽  
Ken R. Busse ◽  
Angelo I. Zenga ◽  
Carl C. Peck
Keyword(s):  
Reverse Osmosis ◽  
Human Urine ◽  
Sea Water ◽  
Pond Water ◽  
Water Pond ◽  
Field Production

Survival characteristics of Cercaria chackai (Digenea: Transversotrematidae)

1983 ◽  
Vol 57 (1) ◽  
pp. 21-26 ◽  
Author(s):  
A. Mohandas ◽  
M.S. Syed Ismail Koya
Keyword(s):  
Survival Time ◽  
Sea Water ◽  
Tap Water ◽  
Pond Water ◽  
Deionized Water ◽  
Digenetic Trematode ◽  
Two Factors ◽  
Water Pond ◽  
Survival Pattern ◽  
The Difference

AbstractThe survival characteristics of Cercaria chackai, the larval form of the curious ectoparasitic digenetic trematode Transversotrema chackai, in sea water, sea water diluted with deionized water in different proportions, deionized water, pond water and tap water were studied. Naturally shed, fresh cercariae had the maximum life span of 20 h 40 min in pond water at salinity 17·8‰, pH 6·45, O2 5·76ml/l and temperature 31·5°C. With increase in salinities beyond 17·8‰, survival time was drastically reduced and beyond 23·58‰,, was restricted to a few minutes. In sea water with a salinity of 38·3‰, the maximum survival time was only 8 min. Below 17·8‰ salinity, although the survival time was less, the difference was not very marked and even in tap water with no salinity, the cercariae lived up to 19 h 50 min. In deionized water the maximum survival time was only 3 h 15 min. Since pond water at pH 6·45 allowed maximum survival time, it is presumed that the cercariae preferred a slightly acidic medium. As temperature was maintained constant and oxygen was available, neither of these two factors, apparently, affected the survival pattern. It is concluded that C. chackai is a typical freshwater form showing considerable tolerance to fluctuations in salinity although the family Transversotrematidae is considered to have a marine origin.

scholarly journals Coastal Water: Wisdom, Destruction, Conflicts and Contestation. A Case of Southwest Coastal Region of Bangladesh

2021 ◽  
Author(s):  
Hamidul Huq ◽  
Tahmid Huq Easher
Keyword(s):  
Coastal Zone ◽  
Crop Production ◽  
Large Scale ◽  
Driving Forces ◽  
Saline Water ◽  
Coastal Region ◽  
Pond Water ◽  
Water Canal ◽  
Water Pond ◽  
Drainage Congestion

The coastal zone of Bangladesh is full of opportunities and vulnerabilities. Water is the central source of these opportunities and vulnerabilities. Seawater, river water, canal water, floodplain water, wetlands water, pond water is the dominant source of livelihoods of coastal people. The propel of the coastal economy is dependent on this water. But salinity alone creates vulnerability of the economy and people dependent on this water. Tidal surge, storm surge, drainage congestion, waterlogging, saline water aquaculture are the driving forces of water crises. Water crises are the unsolved issues ever despite large scale interventions. A shortage of freshwater suffers coastal people ever in regards to crop production, drinking water, health, aquaculture, and so on. Uncertainties driven by cyclones, river erosion, outsiders’ interventions-led consequences are the big challenges of the coastal zone in managing water. Coastal people are challenging, resilient, adaptive, and strong in contestations in managing water resources for their livelihoods. They exploit the opportunities using their ability of reconstruction.

scholarly journals Sugar Palm Fibre-Reinforced Unsaturated Polyester Composite Interface Characterisation by Pull-Out Test

2011 ◽  
Vol 471-472 ◽  
pp. 1034-1039 ◽  
Author(s):  
Zulkiflle Leman ◽  
S.M. Sapuan ◽  
S. Suppiah
Keyword(s):  
Sea Water ◽  
Unsaturated Polyester ◽  
Fibre Surface ◽  
Pond Water ◽  
Single Fibre ◽  
Sewage Water ◽  
Natural Fibres ◽  
Pull Out ◽  
Polyester Composite ◽  
Sugar Palm Fibre

Polymer composites using natural fibres as the reinforcing agents have found their use in many applications. However, they do suffer from a few limitations, due to the hydrophilicity of the natural fibres which results in low compatibility with the hydrophobic polymer matrices. This paper aims to determine the best sugar palm (Arenga pinnata) fibre surface treatment to improve the fibre-matrix interfacial adhesion. Fibre surface modifications were carried out by water retting process where the fibres were immersed in sea water, pond water and sewage water for the period of 30 days. The test samples were fabricated by placing a single fibre in an unsaturated polyester resin. Single-fibre pull-out tests showed that freshwater-treated fibres possessed the highest interfacial shear strength, followed by untreated fibres, sewage water-treated fibres, and sea water-treated fibres. Further surface analyses of the samples were performed using a Scanning Electron Microscope (SEM) and an Energy Dispersive X-ray Spectroscopy (EDS) system.

scholarly journals Female reproductive biology and spawning periodicity of two species of king prawns, Penaeus longistylus Kubo and Penaeus latisulcatus Kishinouye, form Queensland's East Coast Fishery

1988 ◽  
Vol 39 (6) ◽  
pp. 729 ◽  
Author(s):  
AJ Courtney ◽  
MCL Dredge
Keyword(s):  
Egg Production ◽  
East Coast ◽  
Sea Water ◽  
Coastal Region ◽  
Ovary Development ◽  
Commercial Catch ◽  
Ovary Weight ◽  
Species Population ◽  
Spawning Periodicity ◽  
Catch Rates

In the coastal region of central Queensland female red-spot king prawns, P. longistylus, and the western or blue-leg king prawns, P. latisulcatus, had high mean ovary weights and high proportions of advanced ovary development during the winter months of July and August of 1985 and 1986. On the basis of insemination, both species began copulating at the size of 26-27 mm CL, but P. longistylus matured and spawned at a smaller size than P. latisulcatus. Abundance of P. longistylus was generally three to four times greater than that of P. latisulcatus but the latter was subject to greater variation in abundance. Low mean ovary weight and low proportions of females with advanced ovaries were associated with the maximum mean bottom sea-water temperature (28.5�C) for both species. Population fecundity indices indicated that peaks in yolk or egg production (a) displayed a similar pattern for both species, (b) varied in timing from year to year for both species and (c) were strongly influenced by abundance. Generally, sample estimates of abundance and commercial catch rates (CPUE) showed similar trends. Differences between the two may have been due to changes in targeted commercial effort in this multi-species fishery.

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