This paper presents a detailed study carried out in order to predict the influence of various design parameters and operating conditions on the performance of the wet pit pumping station. The method is based on the use of physical and numerical models to reproduce and understand the flow conditions inside the wet pit and their effect on the air entrainment. The research starts with developing a representative model for the wet pit pumping station, goes through conducting the numerical and experimental studies as well as the validation of the results, and ends with providing a valuable easy-to-enforce preliminary design and operating recommendations.

This paper concerns the application of the Smoothed Particle Hydrodynamics (SPH) method for sewer hydraulics with a focus on free-surface flows and sediment flushing. SPH is the most popular mesh-free method and has been widely used in the field of fluid mechanics. Here, the previous studies in the last few years are summarized, which have investigated the application of the relatively new model for the simulation of solid transport, free-surface and multiphase flows.

The paper analyses the share of single SBR in the total energy consumption of the studied wastewater treatment plant. The analysis is based on a two sets of data measurements, gathered by an automated measuring installation and data archived manually by the plant’s operator. Energy consumption was also analyzed with reference to the archive data of daily flows. The paper is based on data collected from November of 2015 to January of 2016. This is a continuation of an ongoing research.

A removal of the antiepileptic drug carbamazepine is frequently observed under anaerobic redox conditions at managed aquifer recharge sites. The biological influence on this effect is widely unknown and therefore it is the focus of this study. Anaerobic degradation batch tests and long-term soil column experiments, conducted within this study, suggest a removal of 2 to 50% induced by microbiological processes. Transformation products and their molecular structures are suggested – one of them is clearly identified as 10,11-dihydro-carbamazepine. This study provides a deeper understanding regarding the biotic reduction of carbamazepine.

The paper presents the calculation rules for infiltration into the saturated zone using a simplified piston model. It has been indicated that recharge is the same as during free infiltration for unsaturated infiltration and that a new system of boundary conditions has been proposed for saturated infiltration and redistribution of moisture. The volumes of infiltration calculated for those cases have also been compared with the results obtained in a simulation based on the conductivity equation, showing convergence.

Humic substances (HS), including soluble fulvic acids (FA), are commonly occurring pollutants, particularly in surface waters. HS were considered as substances, which are harmless for humans until now. They were mainly removed from the water because of turbidity, color and as a source of odor. HS in the process oxidation and disinfection are precursors of carcinogenic and mutagenic substances. Because of this, an analysis has been conducted, discussing their construction, properties and methods used of their disposal.

Dried animal blood plasma, which is offered to the market as a feed product, should meet appropriate standards of quality and epidemiological safety. That is why blood drawing, its transportation, storage and processing must be performed with absolute observance of the principles of hygiene and sanitation. The paper discusses the possibilities of application of techniques used in the food industry for the pretreatment of animal blood plasma to ensure a high quality of the final product. Both the proper treatment of this by-product from the animal’s production as well as its recycling and re-use as a feed or food additives are examples of practical use of cleaner production methods.

The paper presents laboratory experiments on the influence of different hardness water samples collected from the municipal water supply system on the intensification of leaching pollutants from the internal cement mortar pipe lining to drinking water. The paper presents the analysis of water quality indices, such as pH, aluminum and selected heavy metals concentrations after contacting with cement coatings.

A refrigeration cycle modified using an Internal Heat Exchanger is presented. For different refrigerants, the net effect of using an IHX is either positive or negative due to refrigerant properties and working conditions. Wet refrigerant vapor at the inlet of IHX improves the cycle in various aspects. The evaporator performance is much better when not superheating the vapor. A “pure” effect of subcooling the refrigerant liquid at the inlet of the expansion valve results in an increased specific heat of evaporation. For zeotropic mixtures, increased subcooling results in lowering the evaporating temperature without lowering the pressure in the evaporator. The EER value can be improved for some refrigerants and for specific working conditions. Theoretical and experimental evaluations of this concept are presented. Commonly used refrigerants were evaluated theoretically and tested in a 10 kW (cooling capacity) test rig. R22 and R407C were analyzed.

The paper discusses the use of the thermo-hydraulic numerical model to verify the hypothesis of subsoil seepage and erosion development in a section of the Kozłówa Góra dam. This dam is provided with an innovative and advanced system for quasi-3D thermal monitoring of seepage and erosion, which was used for temperature measurements. The herein reported analysis of the measurements showed high applicability of the thermal monitoring method in determining the severity of erosion and seepage processes using numerical modelling.

The article presents the results of numerical calculations performed in a computer software. The simulations concern water flow through an intake screen. This kind of screen can be used in surface water intakes. Thanks to the small inlet velocities and a small mesh size, the screen does not pose a threat to ichthyofauna.

Antibiotics are the most commonly used group of pharmaceuticals used in human and animal treatment. The main sources are hospital and household sewage and waste from animal production. The paper is a review of the literature confirming the prevalence of antibiotics in wastewater influents and effluents, natural waters, sludge and sediments. Studies conducted around the world confirm that there is a risk of antibiotic accumulation in soil and their infiltration to drinking water despite advanced methods of water purification. The concentrations of several substances found in surface water samples exceed the levels considered as safe for the studied aquatic organisms several hundred times, which indicates a real threat to their lives.

The article’s subject is the presence of antidepressants in the wastewater and aquatic environment. The basic characteristics of selected antidepressants were presented. A review of the literature on the occurrence of these compounds in sewage influents and effluents, surface waters and sludge was made. As a general rule, drinking water should be free of any organic, especially pharmaceutical, contaminants. But according to data, the presence of antidepressants in source water for water purification plants poses a threat to their penetration to the water supply system and, eventually, to consumers of water intended for human consumption.

Examples of the use of a scanning electron microscope (SEM) to study organic matter in variable vacuum (VP) were presented. The organisms growing in water (e.g. Chironomidae), carried by water/wastewater (e.g. Protozoa, Amoebozoa) or inhabiting reservoirs (e.g. Algae), were investigated. The results indicate a good agreement between the predictions in source literature and the actual imaging quality in our VP-SEM experiments.

The study determined the method of obtaining UF membranes from cellulose, polyaniline and ionic liquid as the gelling agent. The impact of the applied coagulation agent and the conducting polymer (polyaniline) on the transport and separation properties of the obtained membranes was examined.