Chemical Oxygen Consumption Research Articles

Changes in physicochemical parameters of the alpine/mountain stream influenced by summer flash flood in Tatra Mountains (Western Carpathians)

taChanges to the physicochemical parameters of water in alpine/mountain streams can provide evidence of ongoing natural and anthropogenic processes in their catchment. In this study, we analysed a mountain stream (Javorinka) on the north-eastern side of the Tatra Mountains (Western Carpathians), which is minimally influenced by human activity. The stream was monitored weekly for 5 years (2017–2021) and evaluated for its seasonal variations in physicochemical parameters. These seasonal variations were influenced by the large summer flash flood in July 2018. We hypothesise that floods are essential for the oligotrophic profile of alpine/mountain streams. To support this idea, our main objective was to compare the seasonal trends of the main physicochemical parameters in the stream before and after floods or periods of high flow. We found evidence to support our hypothesis. For example, there was a significant decrease in the chemical consumption of oxygen and ammonia, and, conversely, an increase in the ratio of saturated oxygen and nitrate concentrations. Stream bed erosion also resulted in increased phosphates (over the next 2 years) and high enrichment of the water by dissolved solids in the spring. Interestingly outside of the main objectives, we observed a significant decrease in sulphates, especially in the summer and autumn of 2020 and 2021, which may be related to suppressed emissions due to the restriction of the COVID-19 lockdown. The observed trends and their changes therefore support the idea that alpine/mountain streams are excellent indicators of ongoing environmental processes, and that occasional summer flash floods support the oligotrophic profile of the stream system.

STUDY OF THE SAFETY OF GRAIN POST-ALCOHOLIC GRAIN

Introduction. When producing alcohol, only the starch is extracted from the grain; the remainder of the grain containing various biologically active substances (BAS): proteins and amino acids, reducing substances, uronides, flavonoids, lipids, vitamins and provitamins, with added enzymes is called post-alcohol grain grains, its volume is 12-13 times greater than the volume of alcohol and practically not used. To substantiate the prospects for the pharmaceutical use of grains, two areas of processing have been proposed: to obtain total biologically active substances (“Biobardins”) and in-dividual betaine hydrochlorides with different pharmacological properties. The assumption that the cause of grains spoilage is labile biologically active substances, the isolation of which will determine the stability of grains, requires experimental confirmation. The purpose of the work is to study the chemical and microbiological safety of grains (wheat, corn, barley, millet) before and after its processing (after obtaining Biobardins and betaines). Material and methods. The object of the study is various types of grain grounds (wheat, corn, barley, millet) produced in 2021–2022 by distilleries in the Stavropol Territory. We studied the chemical safety of industrial waste according to the integral and most informative indicator of anthropogenic environmental pollution - the indicator “chemical oxygen consumption” (COC), determined by dichromatometry. Microbiological quality control of grain grounds was carried out in accordance with the requirements of general pharmacopoeial monograph GPM.1.2.4.0002.18 “Microbiological purity” of the State Pharmacopoeia of the Russian Federation XIV. Results. The indicator of “chemical oxygen consumption” (COC), which characterizes the chemical safety of waste and determined by dichromatome-try, decreased by 4.1 times (by 75.6%) when obtaining Biobardinov from stillage (from 54503 to 13205 mg O/l), and when obtaining betaines - 3.5 times (by 71.4%) (from 54503 to 15490 mg O/l). In both options, the recycled grains corresponds to non-hazardous industrial waste. According to the results of specific qualitative reactions, the processed grains contains no biologically active substances characteristic of the original grains: proteins and amino acids, reducing sugars, uronides. Microbiological control of the processed grains also confirmed its microbiological safety in terms of the content of aerobic bacteria, enterobacteria, fungi and the absence of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Salmonella. Conclusion. Thus, the use of various types of post-alcohol grain grains as pharmaceutical raw materials for the production of total and individual medicines made it possible to solve 2 problems: to use grains as a medicinal raw material and to reduce the technogenic impact of grains on the en-vironment.

Electrochemical Oxidation of Ethylene Glycol in Aqueous Media Using Lead Dioxide Titanium Anode

Experiments on the electrochemical oxidation of ethylene glycol (EG) have been carried out in laboratory conditions using lead dioxide titanium anode (LDOTA) in electrochemical cell. It has been found that the chemical oxygen consumption in the solution on LDOTA at a current density of 5.5 A/dm2 and processing time of 120 min is reduced to the values that allow its further bio-purification. It has been concluded that the efficiency of the electrochemical oxidation process, leading to further destruction of the EG molecule, is explained by both direct oxidation, in which the hydroxyl radicals arise that oxidize EG on the anode surface, and indirect oxidation, accompanied by the formation of strong oxidizing agents, for example, peroxodisulfuric acid anions capable of oxidizing the organic matter in the solution volume.

Development of a model for controlling chemical oxygen consumption in pulp production

An approach to the development of a model for controlling chemical oxygen consumption in pulp production based on fuzzy logic is proposed. Since it is not satisfactory to formalize the pulp cooking process strictly mathematically due to the presence of a large number of random factors causing dynamic disturbances of the continuous process, a class of models has been selected that are intuitive to humans and the use of which is not difficult to teach.

Dynamic changes in the microbiota of the middle Volga: a three-year study

The Volga River is one of the largest rivers in Russia, which plays an important role in the life of many plants, animals and humans. Annual research of the river microbiota is an integral part of the work to preserve the river ecosystem and ensure its sustainable development. The work analysed the composition of the microbiota using high-throughput sequencing methods, as well as physicochemical indicators over a three-year period from 2017 to 2019. A stable microbiota community and changes in chemical oxygen consumption and microbial diversity of the Volga River community were revealed.

Wet air oxidation of HTL aqueous waste

Hydrothermal Liquefaction (HTL) provides a pathway to reducing wet waste volumes and producing biofuels such as SAF or sustainable diesel. However, 20–30% of the carbon in wet-waste feed is converted to low molecular weight, water-soluble organic compounds resulting in an aqueous product requiring treatment before disposal. Extraction of fuels or chemicals from the aqueous product is an appealing but challenging route due to the low concentrations and the wide variety of the organic compounds. Herein, we report on wet air oxidation treatment of the HTL aqueous stream to reduce its complexity and increase the concentration of acetic acid in the aqueous product stream.Catalyst screening was carried out at small scale followed by batch reactor studies of selected catalysts. Oxidized products were analyzed to determine the impact of wet air oxidation on chemical oxygen demand (COD), nitrogen content, oxygen consumption and intermediate by-product formation. Batch reactor studies found that metal catalysts including WO3 and ZrO2 increased the concentration of acetic acid in the product stream by at least 10–20% compared to non-catalytic wet air oxidation. Under increasingly intense reaction conditions, COD was further reduced and acetic acid concentration increased. For example, using WO3 at 225 °C increased the concentration of acetic acid in the product stream by 72%, along with significant increases in formic acid. A continuous flow trickle bed reactor with a CeZr catalyst at temperatures ≥200 °C reduced the COD of the aqueous stream by 50% and increased acetic acid concentration by 40% (200 h run).

ENVIRONMENTAL POLLUTANTS OF THE RAINWATER DRAINAGE SYSTEM OF MYKOLAIV

The article is devoted to the study of the chemical composition and quantitative volume of pollutants entering the Bug Estuary with the rainwater sewage of Mykolaiv. It is known that sewage from industrial and municipal enterprises poses a threat of a significant additional burden on limited regional water resources. First and foremost, uncontrolled stormwater runoff is a major concern. In Mykolaiv, there are 49 registered stormwater drains, of which 19 are directly discharged into open water bodies. The purpose of the study was to investigate the chemical composition and volume of urban stormwater runoff into the Bug Estuary. The study was based on the results of chemical analyses of water samples from four storm sewers in Mykolaiv, performed in 2022. The materials of chemical analyses of water samples from five storm sewers of Mykolaiv in 1997 were also included. It was proved that phosphates, oil products, and nitrite nitrogen are present in the stormwater runoff from Mykolaiv to the Bug Estuary. The multiplicity of exceedances of the maximum permissible concentrations is: for biological oxygen consumption - 14-37 times; nitrite - 10-39 times; chemical oxygen consumption - 7-18 times. It has been shown that lead, nickel, iron, copper, chromium, and zinc are released into the Bug estuary with rainwater runoff. Excessive pollution of rainwater with suspended solids is associated with contamination of territories with dust, soil, clay, etc. Excessive pollution with oil products and heavy metals is associated with the operation of motor vehicles and industrial enterprises. It has been shown that unauthorized connections of domestic and industrial sewage systems are mostly responsible for some of the substances that pollute stormwater (phosphates, nitrates). Prospects for further research are the study of the sorption capacity of bottom sediments for the retention of pollutants and the assessment of the ecological capacity of the bottom sediments of the Bug estuary..

Identification of high oxygen-consuming substances in stormwater drainage systems illicitly connected with sewage system

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment, and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological environment. When a water body is anoxic, the activity of anaerobic microorganisms increases and organic matter is decomposed to produce a large number of blackening and odorizing substances, resulting in black and odorous water bodies, which is a very common and typical phenomenon in China. Presently, there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urban drainage pipe network in China, which makes oxygen-consuming substances be directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water bodies, resulting in an oxygen deficiency of the water. This induces seasonal or year-round black and stink phenomena in urban rivers. Hence, identifying high oxygen-consuming substances, which lays the foundation for the subsequent removal of oxygen-consuming substances, is essential. Through a series of comparisons of water quality indicators and analysis of organic characteristics, it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study, and the oxygen-consuming substances of domestic sewage were small molecular amino acids. By comparing 20 conventional free amino acids, it was found that seven of them consumed oxygen easily, and compared with chemical oxygen consumption, biological oxygen consumption was in a leading position.

Conversion of polyphenolic polymers in aerobic biochemical treatment

Polyphenols are organic substances commonly involved in a wide variety of industrial processes. They are prone to polymerize with other organic chemicals during production and subsequent wastewater treatment section, which yields various persistent and recalcitrant organic chemicals. To better understand the behavior of polyphenolic polymers in wastewater treatment processes and the effect on the biodegradability of wastewater, we explored the conversion of polyphenolic polymers during aerobic biochemical treatment and their relationship with extracellular polymeric substances (EPS). The CODCr (chemical oxygen consumption measured using potassium dichromate) removal efficiency of the polyphenolic polymers with high concentration was only 29.66% with CODCr of 437.5 mg/L, which was far from the wastewater discharge standard (60–100 mg/L, first class standard of GB 8978–1996). In the activated sludge system with stabilized organic matter as the substrate, the effluent had the highest degree of humification with the maximum SUVA value of 6.87 L/(mg∙m). The polyphenolic polymers caused a component variation in EPS, further affecting wastewater's humification degree and degradability. In particular, the content of humic acid-like substances in loose bound EPS (LB-EPS) was up to 4 times more than control, indicating higher aromatization and humification degree and of the waste. On the contrary, the content of polysaccharides in LB-EPS decreased by about 46.2–87.7% in treatments with different concentration of polyphenolic polymer. The high-concentration polyphenol polymers somehow stimulated the microbial production like proteins and humic-like substances. The direct conversion of polyphenol polymers also contributed to the increased humification of wastewater.

Spatial and temporal assessment of surface water quality in municipal water bodies of the city of Tyumen

The purpose of the study is a spatio-temporal assessment of the quality of surface water for water bodies of municipal importance in Tyumen in the current conditions of urban economy. A grouping of 16 municipal ponds and waterlogged quarries was carried out according to the results of the water quality assessment. The period of water sampling for the study: 2018–2021; spring, summer and autumn dates of each year of study, a total of 12 observation dates. Analyzed indicators: biochemical oxygen consumption (BOD5), chemical oxygen consumption (COD), dry residue, General, Zn, Na, chloride-anions. The results of the study: all municipal reservoirs of Tyumen during the study had repeatedly exceeding the established values of the maximum permissible concentrations for water bodies of fishery significance in three or more indicators. Most municipal facilities are included in the group of highly hazardous reservoirs, characterized by fixing the excess of the MPC value in water for several indicators, including the heavy metal Zn. The group of reservoirs of the background concentration of pollutants includes the watered quarry “Willow”, in which exceedances were recorded for BOD5, COD and Fe, which is typical for Tyumen natural conditions. The waterlogged quarry “Chistye” and the pond “On Dambovskaya” are classified as extremely dangerous reservoirs, they are characterized by the presence of exceeding the values of the MPC in the water for all indicators, with the exception of the dry residue. The waterlogged quarry “Maisky” is classified as a group of extremely dangerous degraded reservoirs, since during the analyzed time period it recorded exceedances of the MPC values in the water for all indicators. On the example of bottom sediments of the pond “Yuzhny”, a partial section of the ratio of pollutant content at 2 sampling points within the boundaries of the municipal reservoir is shown. Based on the results of the study, recommendations are given for the city authorities to conduct a differentiated approach to the organization of water use for water bodies from different groups.

Factors leading to high concentrations of pollutants in surface waters

The dependence of the frequency of excess of hygienic standards in surface waters on individual substances and complex indexes is investigated. It was found that in some cases, there are significant dependencies on production-induced factors (water withdrawal, wastewater discharge, percentage of plowed lands), while in other cases natural factors (climatic humidity, geological structure of catchment areas) are the predominant ones. Technogenic factors are predominate in case of high values of biochemical oxygen consumption, concentrations of petroleum products and nitrogen compounds. Natural factors of high concentrations are more significant for metal ions, chlorides, sulphates and total salt concentrations. With regard to metals, especially copper and zinc, very strict standards have been adopted in Russia, which also contributes to a very high repeatability and multiplicity of their excess. As for phenols and chemical oxygen consumption, the role of natural or man-made factors is less unequivocal.

ОСОБЛИВОСТІ РОЗПОДІЛУ ЛЕГКООКИСНЮВАНИХ РОЗЧИНЕНИХ ОРГАНІЧНИХ РЕЧОВИН У ВОДІ РІЗНИХ ДІЛЯНОК ВОДОЙМ КИЄВА

The results of study of the easily-oxidizable dissolved organic substances distribution in different Kyiv water bodies are described and discussed. Especially such classes of organic matters as carbohydrates and protein-like substances are investigated. In comparative tables the main hydrochemical characteristics on both the pure water part of lakes and the aquatic overgrowth part of lakes are presented. In particular the indexes of pH, dissolved oxygen concentration, the values of the total dissolved organic substances content according to parameters of chemical oxygen consumption (COC) by permanganat and bihromate oxidizability methods, carbohydrates and protein-like substances concentrations are difined. Also the concentrations of organic carbon (Corg.) and mass parts of different organic compounds in the total dissolved organic substances content are calculated. Among the water bodies studied by us, we observed a slight advantage of the total content of easily-oxidizable dissolved organic substances in overgrowth of higher aquatic plants (an average of 13,0 mg/dm3) over those in pure water (an average of 11,6 mg/dm3). But as all investigated urban water bodies are under significant anthropogenic load, not only natural organic substances but also pollutants could be in the water. The carbohydrates and protein-like substances concentrations, on the contrary, was lower in overgrowth areas of water bodies (an average of 3,10 and 0,58 mg/dm3 respectively). This fact, together with the low content of oxygen dissolved in water (an average of 4,9 mg/dm3), may indicate on the high degree of assimilation by aquatic plants of these organic components necessary for their growth and, as a result, on the ability of the water bodies to self-clean.

Effects of Different Hydrolysis Methods on the Hydrolysate Characteristics and Photo-Fermentative Hydrogen Production Performance of Corn and Sorghum Straw

The effects of hydrolysis methods (hydrothermal, acid, alkali, hydrothermal-enzyme, acid-enzyme, and alkali-enzyme) on hydrolysate characteristics and photo fermentative hydrogen production (PFHP) of corn straw (CS) and sorghum straw (SS) were investigated. The optimum production of reducing the sugar of straw in different solvent environments was studied by one-step hydrolysis and co-enzymatic hydrolysis pretreatment through a 3,5-dinitrosalicylic acid method. The hydrogen production process by photolytic fermentation of hydrolysates of Rhodobacter sphaeroides HY01 was further analyzed through a gas chromatograph, including the differences in accumulated PFHP yield, chemical oxygen consumption (COD), and volatile fatty acid (VFA) composition. The results showed that the highest reducing sugar yield was obtained by the acid method among one-step hydrolysis. In contrast, acid-enzyme hydrolysis can further increase the reducing sugar yield, which reached 0.42 g·g−1-straw of both straws. Both CS and SS had the highest hydrogen yield from acid-enzyme hydrolysate, 122.72 ± 3.34 mL·g−1-total solid of straw (TS) and 170.04 ± 4.12 mL·g−1-TS, respectively, compared with their acid hydrolysates with 40.46% and 10.53% higher hydrogen yields, respectively. The use of enzymatic hydrolysis showed a significantly higher hydrogen yield for CS compared to SS, indicating that acid hydrolysis was more suitable for SS and acid-enzyme hydrolysis was more suitable for CS.

Effectiveness Assessment of the Electrophysical and Acoustic Methods of Water Purification and Wastewater Treatment in the Food Industry

The thesis concerns the study results of the water acoustic treatment influence on its physico-chemical properties. Besides, the authors present the wastewater treatment results of food industry enterprises using superadditive pulse discharge technology with the acoustic treatment. The obtained results demonstrated that the studied technology had a bactericidal effect, reduced the biochemical oxygen consumption rate and the content of fats, nitrites, nitrates, phosphates, ammonium ions in wastewater significantly. The chemical oxygen consumption did not change compared to the control sample, apparently due to the electrode system elements (iron and copper) migration into water. The superadditive pulsed discharges technology of wastewater treatment using electroacoustic and acoustic methods also has great potential for application in the food industry, but the metal erosion problem is a factor limiting the industrial technology implementation currently.

Research of Modern Technologies of Wastewater Treatment of Food Products Combined with Ozonation and Hydrogen Peroxide

The paper presents studies of the process of purification of model wastewater, which contained high concentrations of animal proteins, fats and hydrocarbons. The model wastewater solution was treated by biosorption treatment in a bioreactor; with pre-ozonation (O3) and biosorption purification in the bioreactor and in the variant with pre-treatment with ozonation and hydrogen peroxide – by the method of AOPs (O3/H2O2) or the process «Peroxon». The efficiency of cleaning by chemical oxygen consumption when using the AOPs method reached (97-98) %, disinfection – up to 100 %.

Processing of after-alcohol vinasse for environmentally friendly environment

One of the industrial sources of intoxication polluting the environment is vinasse – a secondary raw material formed during the alcoholic processing of grain in 12 times the volume of alcohol produced. Due to the low content of dry substances (up to 8%), low shelf life (up to 2 days), seasonality of consumption in livestock, the transportation, especially the liquid phase of vinasse, is not economically profitable, which causes the need for its disposal or processing and determines the relevance of this study. Based on the chemical composition of vinasse, the purpose of the study is to study the possibility of obtaining pectins from it as biologically active compounds, which would reduce the volume of vinasse released into the environment thus ensuring its protection. The purpose of the study was fulfilled by solving the following tasks: development of a method of pectins release from vinasse, assessment of their physicochemical and biological properties, determination of chemical and microbiological safety of vinasse wastes. The study included technological, physicochemical, chemical, biological methods. Vinasse fractions were obtained according to the developed method of vinasse processing based on vortex extraction, concentration of extractions, alcohol release of the end products, pectins from liquid (yield 3.1%) and solid (yield 2.9%), which ensured a 20-fold reduction in the volume of vinasse. The characteristics of pectins were established: authenticity, loss in mass during drying, pH, molar mass, content of pectic acid, functional groups, binding properties. The safety and gastroprotective activity of pectins was established. Mother solutions after the release of pectins were estimated to be less than 3.9 times the chemical consumption of oxygen and satisfactory microbiological purity, which made it possible to evaluate them as safe industrial waste.

PRODUCTION OF BIODEGRADABLE POLYMERIC PACKAGING MATERIALS BASED ON POLYOLEFINS AND WOOD FLOUR

The paper presents the results of a comparative study of the physics and mechanical, rheological and biodegradation characteristics of composite materials based on a mixture of polyethylenes of low (LDPE 273-83) and high (HDPE 15303-003) pressure in a ratio of 1 : 1. The composite was also filled with finely ground wood flour with a particle size of less than 200 microns (5-30% by weight) and 10% compatibilizer (functionalized by the alkaline alcoholysis splitting method of sevilene (EVA 12206-007) and a processing additive of 1% polyethylene glycol (PEG-115 (4000). It has been found that with an increase in the content of wood flour (up to 20%), the modulus of elasticity and ultimate strength practically have not changed. The tensile elongation of the composite exceeds 100% (if the content of wood flour is up to 15% by weight). The complex viscosity and shear modulus of the considered melts with different filler contents are practically at the same level. At the same time, the introduction of wood flour up to 30% and a compatibilizer (10%) promotes a slight increase in the viscosity and elasticity of melts, which practically does not affect the change in the manufacturability of the compositions in comparison with LDPE 273-83. For a comparative assessment of the ability of composites to biodegradation, moisture absorption, chemical oxygen consumption, and weight loss of composites in laboratory soil during exposure for 12 months were studied. It has been shown that as the filler content increases, the biodegradability of composites increases.

Tributyltin in Wastewater: Influence on the Performance of Suspended Growth Biological Processes

The aim of this study was to evaluate the potential effect of tributyltin (TBT) on the performance of suspended-growth biological processes. The influence of TBT was evaluated for (i) the endogenous and exogenous respirations of heterotrophic micro-organisms in laboratory-scale batch reactors, taken from a municipal wastewater treatment plant and (ii) chemical oxygen demand (COD) removal, sludge production and oxygen consumption of a pilot-sale membrane bioreactor (MBR) system inoculated with heterotrophic micro-organisms taken from a MBR system. The batch experiments showed that the presence of TBT was likely to modify the activity of bacterial populations in endogenous conditions. The increase in endogenous oxygen needs suggested an increase in the maintenance requirements, essentially to manage the chemical stress induced by the presence of TBT. If the addition of TBT did not perturb COD removal in an MBR system, it limited sludge production and increased oxygen requirements; it is assumed that these modifications were linked with the necessity for the biomass to adapt in this stressful environment, as reflected by an increase in the maintenance requirements. These results emphasised that the respiratory activity of the bacterial cultures was modified by the presence of TBT, in the sense that an excess of oxygen was required to adapt to this chemical stress.

Development and performance evaluation of a novel environmentally friendly adsorbent for waste water-based drilling fluids

Abstract Adsorbent is an important waste water-based drilling fluid treatment agent, which can adsorb and settle heavy metal ions, high polymer organics, and other soluble harmful substances in the waste drilling fluid. Traditional adsorbents such as polyaluminum chloride and polyacrylamide will produce other metal ions or toxic monomers after hydrolysis, which cannot fully meet the requirements of safety and environmental protection. Therefore, a new environmentally friendly waste water-based drilling fluid adsorbent, named RH-β-CD, was prepared by the Wilson etherification reaction, which was initiated by epichlorohydrin and ceric ammonium nitrate, and successfully grafted rhamnolipid and amine strong adsorption groups onto β-cyclodextrin. The adsorption effect and environmental protection performance of RH-β-CD on the organic matter and chromium ion in waste sulfonated water-based drilling fluid were evaluated and compared with commonly used adsorbents such as activated carbon, PAM, and polyaluminum chloride. The results show that RH-β-CD can effectively adsorb the organic matter in the filtrate of waste water-based drilling fluids, reduce its chemical oxygen consumption, and reduce the concentration of heavy metal ions in the filtrate. The effect is better than PAM, activated carbon, and polyaluminum chloride, with the BOD5/CODcr >20% and EC50 >1,000,000 mg·L−1, which is environmentally friendly.

Dynamics of indicators of chemical and biochemical oxygen consumption in the Southern Bug river for 2016–2020

The analysis of modern ecological problems of the Southern Bug river basin is carried out, which allows to reveal the most painful ecological threats. Ways to solve these problems and optimize the management of environmental safety of water resources of Vinnytsia region are proposed. The article examines the dynamics of chemical and biochemical oxygen consumption in the Southern Bug basin and its main tributaries, starting in 2016 and ending in 2020. There is a tendency to increase the value of BOD5 annually in drinking water intakes of the Southern Bug basin in Kirovohrad region, which indicates an increase in water pollution of the rivers Ingul, Sukhoklia and Chorny Tashlyk organic compounds. It is shown that a significant part of organic pollution, estimated by BODp, is formed by the three largest cities: Vinnytsia, Khmelnytsky and Kropyvnytskyi. The total share of these cities among the studied point sources reaches 74% of the total amount of discharged organic matter identified by monitoring. Also, the pollution of the Southern Bug River with organic compounds is a consequence of their entry into surface waters from peatlands and swamps. The share of industry in surface water pollution, compared to utilities; industrial wastewater contains almost nine times less organic matter. The main sources of industrial pollution are Ladyzhyn TPP, Ingul and Smolin mines, JSC BOD in Voznesensk.