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Impact on ecosystem (gaseous effluents)

Impact on ecosystem (gaseous effluents)

1.      The effluents of wastewater treatment plants (WWTPs) include a complex mixture of nutrients and pollutants. Nutrients can subsidize autotrophic and heterotrophic organisms, while toxic pollutants (gaseous effluents) can act as stressors, depending, for instance, on their concentration and interactions in the environment. Hence, it is difficult to predict the overall effect of WWTP effluents on river ecosystem functioning.

2.      We assessed the effects of effluents on river biofilms and ecosystem metabolism in one river segment.

3.      The photosynthetic capacity and enzymatic activity of biofilms showed no change, with the exception of leucine aminopeptidase, which followed the pollution gradient most likely driven by changes in organic matter availability. The effluent produced mixed effects on ecosystem‐scale metabolism. It promoted respiration (subsidy effect), probably as a consequence of enhanced availability of organic matter. On the other hand, and despite enhanced nutrient concentrations, photosynthesis–irradiance relationships showed that the effluent partly decoupled primary production from light availability, thus suggesting a stress effect.

4.       effluents can alter the balance between autotrophic and heterotrophic processes and produce spatial discontinuities in ecosystem functioning along rivers as a consequence of the mixed contribution of stressors and subsidizers.

Coal utilization

The environmental impacts of increased coal utilization are mainly the result of the emission of air pollutants, arising from combustion processes or gasification or liquefaction plants. These pollutants may be distributed over a relatively large area, whose extent depends upon the design and mode of operation of the combustion or conversion process. Liquid and solid wastes, arising from coal utilization, generally represent more localized problems.

Impact on ecosystem (gaseous effluents)


Impacts on the atmospheric environment

It includes the deterioration of air quality, by particulate and gaseous emissions and modification of the climate. Impacts on the aquatic environment include disruption of surface and underground aquatic systems and thermal, particulate, and chemical contamination of waters. Impacts on the terrestrial environment include disruption of land, aquifers and natural drainage contours, soil erosion, flooding, subsidence, and contamination of land surfaces.

Impact on ecosystem (gaseous effluents)


The various impacts on air, land, and water

It can result in damage to plant and animal species and to their habitats, as well as the modification or elimination of ecosystems, damage to property or food resources, and modification of the aesthetic environment. The effects on human health and safety.

Gaseous industrial effluents

These are gases that originate from various processes as effluent gas from energy-intensive industries, such as power, chemical, steel, or cement. These gases represent a large range of substances, from which the ones with the largest volumes are CO2, CO, NOx and SO2.


Recovery of some gaseous effluents

Nitrogen oxides (NOx ) - Recovery and utilization of NOx using the LoTOx system uses large amounts of ozone, which results in unfavorable economic and environmental performance. - However, when abatement is required anyhow, this technology could provide additional benefits from reusing the NOx to produce chemical products.

• Sulphur oxides (SOx ) - Recovery and utilization of SOx is only possible with high concentrations and even then substantial energy required, resulting in high costs and high environmental impacts - However, when abatement is required anyhow, this technology could provide additional benefits from reusing the SOx to produce chemical products.

• Hydrogen (H2 ) - Various potential utilization with economic and environmental benefits of hydrogen is available at high concentrations and is used in combination with other gases, like CO2 and CO

Ukah, B.U., Ameh, P.D., Egbueri, J.C., Unigwe, C.O. and Ubido, O.E., 2020. Impact of effluent-derived heavy metals on the groundwater quality in Ajao industrial area, Nigeria: an assessment using entropy water quality index (EWQI). International Journal of Energy and Water Resources, pp.1-14.
Islam, R., Al Foisal, J., Rahman, M., Lisa, L.A. and Paul, D.K., 2016. Pollution assessment and heavy metal determination by AAS in waste water collected from Kushtia industrial zone in Bangladesh. African Journal of Environmental Science and Technology10(1), pp.9-17.

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