scholarly journals ALGAL DYNAMICS OF RIVER PANDU IN RELATION TO AMBIENT ENVIRONMENT

2014 ◽  
Vol 20 ◽  
pp. 9-17
Author(s):  
Sunita Verma ◽  
Divya Tiwari ◽  
Ajay Verma
Keyword(s):  
Fly Ash ◽  
Aquatic Environment ◽  
Algal Growth ◽  
Current Status ◽  
Species Number ◽  
Anthropogenic Stress ◽  
Algal Population ◽  
Sharp Decline ◽  
Physico Chemical ◽  
Low Diversity

An investigation on river Pandu in the year 2009-2010 was carried out to explore its current status in terms of physico-chemical and phycological profile. The study revealed that algal spectrum of the river was connected with the intensity of pollution in the river. River, at present is a perturbed ecosystem due to heavy anthropogenic stress on it. Despite abundant nutrients and other factors responsible for propping algal growth, river had a meak algal population and low diversity as compared to other perennial rivers indicating the grossly polluted unhealthy condition of the river. Algae are natural inhabitants of aquatic environment; and act as natural purifiers due to their nutrient gleaning and oxygenating capabilities; they are more sensitive than animals to industrial and municipal wastes. Maximum number of species existed at station-1 followed by stations-4 and 6 and then at station-5. Lowest species representation has been noticed at stations-2 and 3. Species number and algal population too declined sharply at stations-2 and 3 as compared to station-I. Sharp decline in algal population at stations-2 and 3 may be attributed to certain obvious reasons such as low transparency and reduced illumination as a consequence of residual fly ash discharged by PTPP drain at station-2. Except station-1, all downstream stations show grossly polluted condition of the river.DOI: http://dx.doi.org/10.3126/eco.v20i0.11325Ecoprint: An International Journal of EcologyVol. 20, 2013Page : 9-17

EFFECT OF FLY ASH ON CROP YIELD AND PHYSICO-CHEMICAL, MICROBIAL AND ENZYME ACTIVITIES OF SODIC SOILS

2016 ◽  
Vol 15 (11) ◽  
pp. 2433-2440 ◽  
Author(s):  
Kripal Singh ◽  
Vimal Chandra Pandey ◽  
Bajrang Singh ◽  
Dharani D. Patra ◽  
Rana P. Singh
Keyword(s):  
Fly Ash ◽  
Crop Yield ◽  
Enzyme Activities ◽  
Sodic Soils ◽  
Physico Chemical

Airborne Algal growth on roofs of membrane-structured residences in cold area of Japan

2020 ◽  
pp. 174425912098003
Author(s):  
Makiko Nakajima ◽  
Daisuke Masueda ◽  
Shuichi Hokoi ◽  
Takayuki Matsushita
Keyword(s):  
Algal Growth ◽  
Residential Building ◽  
Growth Conditions ◽  
Building Structure ◽  
Transparent Film ◽  
Cold Region ◽  
Algal Population ◽  
Building Facades ◽  
Cold Area ◽  
Survey Results

The discoloration of building facades due to airborne algae is observed in our surroundings. The growth conditions of these algae are not yet fully understood, and efficient measures for preventing the growth of the algae are not presently available. The objective of this study was to investigate the effects of the ambient environment and building structure on algal growth. A residential building in a cold region of Japan was surveyed. The roof was a multi-layered structure comprising a semi-transparent film, an air layer, and a layer of insulation from the outside, supported by rafters. The soiled state was visually observed by taking photographs. On the northeast (NE) and northwest (NW) roofs, several black stripes appeared 4 months after cleaning. The soiling increased in the spring and autumn. The soiling first appeared on the film backed by the rafter and then extended to the film backed by the air layer. The condensation time during the day in the rafter part was longer than that in the air-layer part. Condensation occurred during the night, but its frequency exhibited no dependence on the orientation of the roof. Algae tend to die when exposed to an environment with a temperature higher than 45°C. The NE roof had the shortest period with a surface temperature of >45°C. These measurements agreed well with the survey results, which indicated that the soiling mainly occurred on the NE and NW sides of the roofs. The time for algal growth was estimated under the assumption that algae can grow at surface temperatures ranging from 0 to 45°C, in agreement with the observed soiling. The observed soiling changes were well explained by the algal population calculated via a growth predictive model according to the algal temperature and relative humidity.

scholarly journals Thermal, Physico-Chemical, and Mechanical Behaviour of Mass Concrete with Hybrid Blends of Bentonite and Fly Ash

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 60 ◽  
Author(s):  
Muhammad Ahad ◽  
Muhammad Ashraf ◽  
Rabinder Kumar ◽  
Mukhtar Ullah
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Thermal Stresses ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Pozzolanic Reaction ◽  
Pulse Velocity ◽  
Mass Concrete ◽  
Gravimetric Analysis ◽  
Physico Chemical

Mass concrete has been commonly known for its thermal stresses which arise due to the entrapment of hydration temperature susceptible to thermal cracking. The utilization of mineral additives is a promising and widely adopted technique to mitigate such effects. This paper presents the thermal, physico-chemical, mechanical, and morphological behaviour of mass concrete with blends of bentonite (BT) and fly ash (FA). Apart from the rise in temperature due to hydration, the compressive strength, ultrasonic pulse velocity (UPV), differential thermal analysis (DTA), thermo-gravimetric analysis (TGA), X-ray diffraction (XRD) analysis, and microstructure were studied. The results of this study revealed that the substitution of BT and FA significantly improved the compressive strength and development rate of UPV in the mass concrete samples. The FA concrete (FC) specimen presented the lowest temperature during the peak hours compared to all other concrete mixes studied in this research. Bentonite concrete (BC) was also found to be more effective in controlling the escalation of temperature in mass concrete. Scan electron microscopy (SEM) micrographs presented partially reacted FA particles in a mix. XRD and DTA analysis indicated that the concentration of calcium hydroxide (CH) declined by substituting FA and BT, specifically in ternary blends, which was due to the dilution effect and consumption of CH through the pozzolanic reaction.

scholarly journals Temporal and Bathymetric Variation of Epiphytic Microalgae on Posidonia oceanica (L.) Delile Leaves in Gökçeada (North Aegean, Turkey)

2020 ◽  
Vol 20 (10) ◽  
pp. 727-737
Author(s):  
Aysu Guresen ◽  
Sedat Ozan Guresen ◽  
Yelda Aktan
Keyword(s):  
Leaf Surface ◽  
Environmental Parameters ◽  
Posidonia Oceanica ◽  
Filamentous Cyanobacteria ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Low Diversity ◽  
North Aegean ◽  
Benthic Ecosystems ◽  
Surface Improvement

Epiphytic microalgae attached to Posidonia oceanica leaves play a significant role through primary production, nutrient cycling and trophic fluxes in benthic ecosystems. Due to their sensitivity, epiphytic microalgae respond to environmental alterations more quickly than their host. The aim of this study is therefore to evaluate the ecological quality in Gökçeada Underwater Park (North Aegean) using epiphytic microalgal composition and abundance. In this respect, P. oceanica shoots are collected at 6m, 15m and 28m in May, July, October 2009 and January 2010 to estimate the microalgal composition and abundance. Also, P. oceanica descriptors and physico-chemical parameters in the water column of the meadow lower limit are measured. Leaf surface improvement through greater depths, have provided a convenient substratum for epiphytic colonization. A total of 56 taxa belonging to epiphytic microalgae are composed of Bacillariophyceae (91%), Cyanophyceae (7%) and Dinophyceae (2%). Temporal and bathymetric dynamics of the epiphytic community structure and abundance depend on the environmental parameters; such as leaf surface, nutrients and turbidity. Also, a mucilage phenomenon, resulted in a low diversity due to the dominancy of filamentous cyanobacteria. Necessary data is supplied for a less evaluated region affected by agricultural activities and urbanization in the recent years.

scholarly journals Synthesis and sintering of high-temperature composites based on mechanically activated fly ash

2012 ◽  
Vol 44 (2) ◽  
pp. 135-146 ◽  
Author(s):  
A. Terzic ◽  
Lj. Pavlovic ◽  
N. Obradovic ◽  
V. Pavlovic ◽  
J. Stojanovic ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Fly Ash ◽  
Mechanical Activation ◽  
Power Plants ◽  
Sem Analysis ◽  
Fly Ashes ◽  
Physico Chemical ◽  
Fly Ash Utilization ◽  
And Behavior

Amount of fly ash which is and yet to be generated in the coming years highlights the necessity of developing new methods of the recycling where this waste can be reused in significant quantity. A new possibility for fly ash utilization is in high-temperature application (thermal insulators or/and refractory material products). As such, fly ash has to adequately answer the mechanical and thermal stability criteria. One of the ways of achieving it is by applying mechanical activation procedure on fly ash. In present study, fly ashes from two different power plants were mechanically activated in a planetary ball mill. Mechanically treated fly ashes were cemented with two different binders: standard Portland cement and high-aluminates cement. Physico-chemical analysis and investigation of mineralogical components of composites are emphasized, due to the changes occurred in fly ash during mechanical activation and sintering of composites. Macro-performance of the composites was correlated to the microstructure of fly ash studied by means of XRD and SEM analysis. Thermal stability of crystalline phases was investigated with DTA. Highlight was placed on determination of relationship between mechanically activated fly ash and obtained composites microstructure on one side and behavior of sintered composites on the other side.

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