Suppression of nutrient release from freshwater lake sediments using granulated coal ash

2018 ◽  
Vol 18 (5) ◽  
pp. 1810-1824
Author(s):  
Takehiko Fukushima ◽  
Masako Okabe ◽  
Tadashi Hibino ◽  
Narong Touch ◽  
Kenji Nakamoto
Keyword(s):  
Thermal Power ◽  
Coal Ash ◽  
Nutrient Release ◽  
Chemical Effect ◽  
Phosphorus Concentration ◽  
Eutrophic Lakes ◽  
Power Stations ◽  
Incubation Experiments ◽  
Thermal Power Stations ◽  
Fall Experiment

Abstract In order to investigate the applicability of granulated coal ash (GCA), a by-product of coal thermal power stations, to freshwater lakes, two incubation experiments (fall and summer experiments) were conducted using large-volume vessels and sediments taken from eutrophic lakes. The phosphorus and nitrogen release fluxes in the vessels with GCA (up to 2.9 mg m−2 d−1 for total phosphorus and 23.9 mg m−2 d−1 for total nitrogen) were considerably smaller than those in the vessels without GCA (up to 8.9 mg m−2 d−1 and 56 mg m−2 d−1, respectively), except in the case of phosphorus in the fall experiment, and thus the phosphorus concentration released from the vessel without GCA under anoxic conditions in the summer experiment was extraordinarily higher (over 1.5 mg l−1) than those in the other vessels (less than 0.31 mg l−1). Supplementary experiments with smaller columns indicated that the chemical effect of GCA was on a similar level with its physical effect and that the threshold phosphorus concentration for removing it was lower in freshwater than seawater. The chromium level slightly exceeded the standard for drinking water and the development of technology to suppress its release is a future challenge.

Effects of Warm Wastewaters from Thermal Power Stations on Ecosystems of the Sava and the Velika Morava, Tributaries of the Danube

1990 ◽  
Vol 22 (5) ◽  
pp. 155-160 ◽  
Author(s):  
D. V. Janković
Keyword(s):  
Thermal Power ◽  
Coal Ash ◽  
Aquatic Communities ◽  
Negative Effects ◽  
Ambient Temperatures ◽  
Positive Effects ◽  
Power Stations ◽  
Thermal Power Stations ◽  
Nikola Tesla ◽  
Water Ecosystems

Investigations were conducted over several years, from 1977 to 1989, into the effects of warm wastewaters from thermal power stations on ecosystems of the Sava and the Velika Morava, tributaries of the Danube in Yugoslavia. The thermal power stations (TPSs) were the ‘Morava' TPS, situated near Svilajnac on the River Morava, and ‘Nikola Tesla A and B' TPSs near Obrenovac on the River Sava. These rivers also receive industrial and urban wastewaters along their whole length. The temperature differences between the river waters abstracted and the wastewaters returned to the rivers were from 8 to 15°C. In the areas influenced by these warm wastewaters, greater heterogeneity of ichthyofauna and faster growth and maturation of fish were observed. These were considered to be positive effects. Due to the periodic washing out of TPS coal ash repositories which are located in the riparian areas, concentrations of sulphates, phosphates, and nitrates have been increasing in the Morava, which may have negative effects on the aquatic communities. High ambient temperatures in the summer, during periods of low water and reduced oxygen content in the polluted river conditions, also had negative influences on the water ecosystems. The warm wastewaters from the thermal power stations could be used in aquaculture, which would decrease the thermal pollution of the rivers during summer lower water periods.

STUDY OF HEAVY METALS IN WHEAT AND PADDY GRAINS

1999 ◽  
Vol 09 (03n04) ◽  
pp. 365-371 ◽  
Author(s):  
V. VIJAYAN ◽  
S. N. BEHERA ◽  
P. S. M. TRIPATHY ◽  
GULAB SINGH
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Large Fraction ◽  
Thermal Power ◽  
Combustion Process ◽  
Coal Ash ◽  
X Ray ◽  
Power Stations ◽  
Thermal Power Stations ◽  
Bulk Scale

A large fraction of coal extracted from the earth is burnt in thermal power stations. In the combustion process most of the mineral matters in the coal are fused into an fly ash. Fly ash has a great potential for use in agriculture as a provider of major and micro nutrients to plants. Concentrations of some elements in the soil may increase when fly ash is applied to the soil. This paper presents the results on analysis of heavy metals in crops of wheat and paddy grown over last two years on coal ash-applied soils of Bakreswar and Farakka sites as a part of Fly Ash Mission projects on bulk scale utilization of coal ash in agricultural lands by Particle Induced X-ray Emission(PIXE) and Energy Dispersive X-ray Fluorescence(EDXRF) techniques.

Adaptation of Algorithms for Diagnostics of Steam Turbine Unit Equipment to Specific Conditions at Thermal Power Stations

2020 ◽  
Vol 67 (11) ◽  
pp. 800-804
Author(s):  
K. E. Aronson ◽  
B. E. Murmansky ◽  
V. B. Novoselov ◽  
Yu. M. Brodov ◽  
A. Yu. Sosnovsky ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Turbine Unit ◽  
Thermal Power ◽  
Steam Turbine Unit ◽  
Power Stations ◽  
Thermal Power Stations

Small-waste technology of water desalination at thermal power stations

Desalination ◽  
1999 ◽  
Vol 126 (1-3) ◽  
pp. 261-266
Author(s):  
A.S. Sedlov ◽  
V.V. Shischenko ◽  
V.F. Ghidkih ◽  
R.M. Chasiachmetov ◽  
Y.I. Pichushkin
Keyword(s):  
Thermal Power ◽  
Water Desalination ◽  
Power Stations ◽  
Thermal Power Stations

The Latest Research in Mongolia on the Utilization of Coal Combustion By-Products

2021 ◽  
Vol 323 ◽  
pp. 8-13
Author(s):  
Jadambaa Temuujin ◽  
Damdinsuren Munkhtuvshin ◽  
Claus H. Ruescher
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Coal Combustion ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Power Stations ◽  
Thermal Power Stations ◽  
Coal Ashes ◽  
By Products

With a geological reserve of over 170 billion tons, coal is the most abundant energy source in Mongolia with six operating thermal power stations. Moreover, in Ulaanbaatar city over 210000 families live in the Ger district and use over 800000 tons of coal as a fuel. The three thermal power plants in Ulaanbaatar burn about 5 million tons of coal, resulting in more than 500000 tons of coal combustion by-products per year. Globally, the ashes produced by thermal power plants, boilers, and single ovens pose serious environmental problems. The utilization of various types of waste is one of the factors determining the sustainability of cities. Therefore, the processing of wastes for re-use or disposal is a critical topic in waste management and materials research. According to research, the Mongolian capital city's air and soil quality has reached a disastrous level. The main reasons for air pollution in Ulaanbaatar are reported as being coal-fired stoves of the Ger residential district, thermal power stations, small and medium-sized low-pressure furnaces, and motor vehicles. Previously, coal ashes have been used to prepare advanced materials such as glass-ceramics with the hardness of 6.35 GPa, geopolymer concrete with compressive strength of over 30 MPa and zeolite A with a Cr (III) removal capacity of 35.8 mg/g. Here we discuss our latest results on the utilization of fly ash for preparation of a cement stabilized base layer for paved roads, mechanically activated fly ash for use in concrete production, and coal ash from the Ger district for preparation of an adsorbent. An addition of 20% fly ash to 5-8% cement made from a mixture of road base gave a compressive strength of ~ 4MPa, which exceeds the standard. Using coal ashes from Ger district prepared a new type of adsorbent material capable of removing various organic pollutants from tannery water was developed. This ash also showed weak leaching characteristics in water and acidic environment, which opens up an excellent opportunity to utilize.

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