scholarly journals Concentration and composition of hydrocarbons in the river Ural mouth zone in the period of high water

2019 ◽  
Vol 46 (3) ◽  
pp. 303-307
Author(s):  
I. A. Nemirovskaya ◽  
B. V. Konovalov
Keyword(s):  
Surface Water ◽  
Organic Compounds ◽  
River Runoff ◽  
Caspian Sea ◽  
Suspended Solids ◽  
High Water ◽  
The North ◽  
Hydrocarbon Content ◽  
Mouth Zone ◽  
High Concentrations

High concentrations of hydrocarbons were detected in the surface water suspended solids of the near-mouth zone of the river Ural during periods of high water level. On average, 198 and 270 μg/l suspended solids were detected in 2016 and 2017, respectively. Weathered oil alkanes were prevalent in the composition of hydrocarbons. The hydrocarbon content was low in sands with an average of 7.8–14.6 μg/g. Terrigenous high-molecular mostly stable alkanes predominated in their composition. The interannual variability of the content of organic compounds is connected with the river runoff and the supply of oil contaminants is connected with the flood water. The Ural River’s runoff during high-water periods is expected to significantly affect the ecological conditions of the North Caspian Sea.

scholarly journals Superabsorbent polymers in slurry gelling

2020 ◽  
Vol 15 (7) ◽  
pp. 1
Author(s):  
Luiza Fernanda dos Santos Pereira ◽  
Marcos Roberto Furlan ◽  
Paulo Fortes Neto
Keyword(s):  
Heavy Metals ◽  
Electrical Conductivity ◽  
Organic Compounds ◽  
Suspended Solids ◽  
Summer Season ◽  
Liquid Volume ◽  
Distilled Water ◽  
Superabsorbent Polymer ◽  
High Concentrations ◽  
Negative Impacts

Disposal of solid waste in landfills causes negative impacts on the environment, caused by emissions of greenhouse gases and the release of dark-colored leachate. It’s composition includes high concentrations of suspended solids, heavy metals, salts and organic compounds. Given the above, this study evaluated the use of superabsorbent polymer in the treatment of leachate. Slurry samples were collected at the Taubaté landfill in two seasons to determine electrical conductivity, pH, turbidity, oils and greases. Other samples were submitted to the following treatments: 3.5 g of polymer with 500 g of distilled water, and doses of 3.5; 7.0; 10.5; 14.0; 17.5; 21.0; 24.5; and 28.0 g of polymer with 500 g of slurry, with 4 repetitions each. Other steps, in sequence, were: transformation of the material into gel (gelation), obtaining the liquid volume of water and slurry, and after 0, 12, 24, 48 and 72 h, measurements of polymer dehydration were obtained. The efficiency of doses was determined by the volume of leachate remaining after each treatment. Gelation was more efficient in the summer season, a season with lower values of electrical conductivity, pH, suspended solids, and oils and greases. The most efficient doses in gelation were 10.5 g in summer and 14.0 g in autumn. In conclusion, superabsorbent polymer can be used in the treatment of leachate because it allows its gelling, but the recommended doses vary with the seasons.

Detection of semi-volatile organic compounds (SVOCs) in surface water, soil, and groundwater in a chemical industrial park in Eastern China

2015 ◽  
Vol 73 (5) ◽  
pp. 1175-1189 ◽  
Author(s):  
Benhua Liu ◽  
Yuehua Li ◽  
Jianfeng Ma ◽  
Linxian Huang ◽  
Liang Chen
Keyword(s):  
Surface Water ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Eastern China ◽  
Industrial Park ◽  
Chemical Production ◽  
The North ◽  
Detection Frequency ◽  
Volatile Organic ◽  
Chemical Industrial Park

China is suffering from serious water and soil pollution, especially in the North China Plain. This work investigated semi-volatile organic compounds (SVOCs) in surface water, groundwater and soil within a chemical industrial park in Eastern China, for which the volatile organic compound (VOC) results have been previously reported. A total of 20 samples were collected from the field, and analyzed in the laboratory. A 100% detection frequency of SVOCs in samples from this chemical industrial park was observed (same as VOCs). Moreover, the detection frequency of 113 SVOCs in each sample reached 15.93, 12.39 and 20.35% for surface water, groundwater and soil, respectively. The most detected SVOCs in the park included N-containing SVOCs, polycyclic aromatic hydrocarbons, phthalates, organic pesticides and polychlorodiphenyls. The elevated detecting frequencies and concentration levels of SVOCs identified in the groundwater were attributed to the intensive chemical production activities in the park. In addition, the agricultural activities in the area might also have contributed to the SVOCs to the groundwater. The results of VOCs and SVOCs from this and previous studies suggest that the groundwater in this industrial park has been severely contaminated, and the contamination likely spreads beyond the park. Imminent hydrogeological assessments and remedial actions are warranted to eliminate the source and mitigate the potential plume expansion beyond the park boundary.

scholarly journals Assessing changes in surface water quality and pollutant load in Dong Nai province

2016 ◽  
Vol 19 (4) ◽  
pp. 249-258
Author(s):  
Huong Thi Diem Bui ◽  
Tuan Ngoc Le
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Industrial Wastewater ◽  
Quality Index ◽  
Suspended Solids ◽  
Surface Water Quality ◽  
Current Status ◽  
Pollutant Loads ◽  
High Concentrations

This study aims at assessing changes in the surface water quality in Dong Nai province (2010- 2014). In addtion, the pollutant loads of wastewater sources were calculated till 2020–2030 with 03 wastewater treatment scenarios serving for the local environmental management. The water quality index (WQI) showed the surface water quality of Dong Nai Province to be gradually improved during the dry season but significantly declined in the rainy season in the last 5 years due to high concentrations of suspended solids (SS), Fe and microorganism - especially in the 3rd segment of Dong Nai river through Bien Hoa City. This current status certainly relates to pollutant loads from waste water sources in the province. Pollutant loads of domestic and industrial wastewater in Bien Hoa city are the highest (40 % per source), livestock activities in Xuan Loc district account for 20 %; aquaculture activities in Nhon Trach district contribute more than 75 % of the corresponding total loads, etc. in which loads of BOD5, COD and SS are significant, about 581,570 tons, 1,035,403 tons and 639,153 tons per year, respectively, and tend to increase in the future, requiring appropriate solutions.

scholarly journals QUANTITY AND DISTRIBUTION OF CASPIAN ROACH, BREAM AND PIKE PERCH UNDERYEARLINGS IN THE NORTH-WEST OF THE CASPIAN SEA IN CONDITIONS OF THE VOLGA HIGH WATER AND LOW WATER RUN OFF

2018 ◽  
pp. 74-82
Author(s):  
Ljubov’ Aleksandrovna Belogolova ◽  
Tatyana Anatolievna Solokhina
Keyword(s):  
Caspian Sea ◽  
High Water ◽  
Water Area ◽  
The Caspian Sea ◽  
Volga River ◽  
North West ◽  
The North ◽  
Run Off ◽  
Pike Perch ◽  
Caspian Roach

The article presents the comparative analysis of quantity and the distribution of Caspian roach, bream and pike perch underyearlings in western part of the northern Caspian in the current context of the Volga river high water and low-water run-off in 2013-2016. It has been shown that, depending on conditions of each year, the quantity of the three species underyearlings varies too much. The biggest number of Caspian roach and bream in the period under review was observed in 2013 and 2016, and the biggest pike perch quantity - in 2016. In spite of certain variability, the quantity of Caspian roach and pike perch underyearlings stays low today. Bream quantity in some years increased up to the level of middle yielding generations. In spite of low quantity, Caspian roach underyearlings almost completely developed feeding territories of western part of the north Caspian in both high water and in low-water years. The foraging area of bream and especially of pike perch underyearlings is smaller than Caspian roach one. They spread to the maximum upon the water area of the Caspian Sea in 2016, that year was the most favorable in salinity for generative freshwater fish for the last few years. Caspian roach underyearlings generally gained weight in waters with salinity over 8‰, bream - in desalinated areas with salinity up to 5‰. Pike perch underyearlings stayed in desalinated areas during the high water years; they were found across the studied spectrum with low (0-5‰), high (>10‰) and moderate water salinity (5-8‰) during the low-water years.

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