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The Effect of Oil Pollution of the Gray Soils on Revegetation in the South of Kazakhstan

Issayeva Akmaral, Mametova Akmaral, Baiduisenova Togzhan, Kossauova Akerke, Zhumakhanova Roza, Zhumadulayeva Alisa, Ashirbayeva Saltanat, Patashova Akerke

Journal of Ecological Engineering

2023

Vol. 24, nr 1

28--33

To assess the level of soil contamination with oil and petroleum products, the criterion of the cenotic level as the nature of the phytocenosisformation was used. It was found that the bioindication reaction of vascular plants to oil pollution is the deterioration of quantitative and qualitative indicators of the native phytocenosis with possible self-recovery of the plant community at the threshold concentrations of petroleum products 6.0±0.3–8.0±0.5 l/m2. Light fractions of oil products cause complete destruction of the existing plant community, and the new community is formed at the expense of the soil stock of seeds and drift ruderal plant species. Dark fractions of petroleum products cause structural changes in the species composition of the existing phytocenosis. The most resistant to oil pollution of the soil are the representatives of the Poaceae family, and the representatives of the families Solanacee and Malvaceae are eliminated from the phytocenosis. For 8 years of research, the projective cover of soil with vegetation is reduced to 92.6±6.3–99.6±0.4%.

FE2(SO4)3 and Bentonite Use to Reduce Cod Indicators in Wastewater Containing Detergents

Issayeva Akmaral, Abubakirova Azhar, Syzdykova Marzhan, Arystanova Saltanat, Anlamasova Gulnara, Zhumakhanova Roza, Leska Boguslawa

Journal of Ecological Engineering

2022

Vol. 23, nr 3

68--73

Wastewater pollution with detergents is one of the environmental problems associated with the rational use of water resources. The existing methods of physicochemical wastewater treatment, despite their efficiency, are open to secondary environmental pollution. Biological coagulation/flocculation methods are widely used with the plant waste. The aim of this research was the use of ferric iron obtained by means of the bacterial-chemical method and bentonite to reduce the chemical oxygen demand in the wastewater containing detergents. It was identified that the use of Fe2 (SO4)3 obtained using the bacterial-chemical method with thionic bacteria Acidithiobacillus ferrooxidans BIT 1 and bentonite as a clay material is promising. At the same time, it was found that the highest reduction degree in the chemical oxygen demand – 88.1 ± 7.9% in wastewater was noted in the variation where the bacterial-chemical ferric iron in the amount of 1.75 g/L was used in combination with bentonite in the amount of 600 mg/L.