The aeration step is the most energy consuming process in the wastewater treatment plant, i.e. making the energy usage in this step more efficient is of great concern both in Sweden and world wide. There are some examples of previous studies investigating ways to make the ae- ration control more efficient, though most of these have focused on for example ammonium feedback control rather than blower control which is the main focus of this study. Bromma wastewater treatment plant installed three new blowers in december 2016 functioning as suppliers of air to the aeration step in the bioreactor. Since there are still three old blowers operating at the WWTP, there is a need to control two different types of blowers efficiently. This is challenging since the two blower types have different capacities, efficiency and maxi- mum/minimum air flows and a control strategy that optimizes the operation of these two blower types combined needs to take this into account. Operational data for the blowers was used to generate a second grade polynome for each blower type which gives the efficiency as a function of produced air flow. These polynomes were further utilized to build a script in MATLAB that chooses the most efficient number of blowers operating and at what air flows for a certain total aeration need. The least square method was used to calibrate a model for calculating energy consumption for the simulated control strate- gy. Calculations for energy consumption from the current control strategy and another strategy proposed by the blower deliverer Sulzer were made in order to decide whether the optimized control strategy was an improvement or not. The simulation results and the calculations for energy consumption indicates that the current control strategy at Bromma WWTP is almost as effective as the optimized control strategy. Both strategies sets the new blowers at the first places in the queue. The optimized strategy appears to be more efficient for flows that requires both new and old blowers operating. From the calculations of energy consumption, it was shown that the control strategy from Sulzer de- mands an energy consumption on levels in between the one for the current control strategy and the optimized control strategy. / Luftningssteget är den mest energikrävande processen i ett avloppsreningsverk. Det finns därför incitament till att effektivisera energianvändningen då en minskad elförbrukning är positivt både ur ett ekonomiskt perspektiv och ur ett resursmässigt perspektiv. Energibesparingar från luftningssteget har undersökts tidigare genom att främst studera optimering av syreregleringen och luftregulatorn. Det här projektet syftar till att uppnå en minskad effektförbrukning på Bromma reningsverk genom att optimera blåsmaskinsregulatorn, ett mer outforskat forskningsfält.  På Bromma reningsverk installerades den 16 december 2016 tre nya blåsmaskiner som ska försörja luftningssteget i den biologiska reningen med luft. Det innebär att det finns två olika typer av blåsmaskiner som är i drift på Bromma: den gamla modellen (HST9000) och den nya modellen (HST40). Då dessa två olika typer av blåsmaskiner har olika kapacitet och verkningsgrad är det viktigt att blåsmaskinsregulatorn använder en styrstrategi som ställer dessa maskiner i kö på ett optimalt energieffektivt sätt. Det är även viktigt att i så stor utsträckning som möjligt låta maskinerna generera luftflöden nära sin högsta verkningsgrad.  Driftinformation för blåsmaskinerna användes för att med hjälp av beräkningar i MATLAB kunna välja ut det effektivaste antalet maskiner i drift, avgöra vilken typ av maskiner som ska användas samt vilket luftflöde respektive maskin ska generera vid ett specifikt luftflödesbehov. Målet var att hitta en optimal styrstrategi för Bromma reningsverk, samt att undersöka om det fanns möjligheter till energibesparingar jämfört med nuvarande implementerade styrstrategi. Effektförbrukningsberäkningar gjordes för både den simulerade optimerade styrstrategin och den nuvarande. Ytterligare en styrstrategi, föreslagen av blåsmaskinsleverantören Sulzer, undersöktes också ur ett energiförbrukningsperspektiv för jämförelse.  Resultatet av simuleringen och effektberäkningen indikerar att den nuvarande styrningen i princip är lika energieffektiv som den simulerade optimala styrningen. I båda fallen kopplas de nya maskinerna in i första hand. Dock visar resultatet på att den simulerade styrningen är effektivare vid flöden där det krävs att de gamla blåsmaskinerna sätts i drift. Sulzers föreslagna styrstrategi är mer energieffektiv än nuvarande styrning, men inte lika effektiv som den optimerade styrstrategin.

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This thesis is written due to the poor quality of the stream Sudický potok and the fish kills in nearby ponds supplied by the stream. The goal is evaluating the results of the water samples obtained from the four local spots. Polluted quality in the stream in the Sudice town then proceed to design three various solutions of the sewage collection systems. The first option is designing the municipal wastewater treatment plant and the draining wastewater by single sewerage or sanitary sewerage. The second choice designs the domestic waste water treatment plants. The third solution is designing the sanitary sewerage and effluent sewerage to the nearby waste water treatment plant in Šebetov town. All variants are economically evaluated. In conclusion the first solution, municipal waste water treatment plant with the single sewerage, is recommended.

This diploma thesis deals with the assessment of the technical condition of the raw water supply Dnipro-Mykolaiv for water treatment plant Inhulets in Ukraine and the reconstruction proposal of the section of this supply. Specifically, it is a 300 m long section of the steel pipeline DN 1 400 of the first row of the sypply near the Myrné village in Bilozerka Raion (district), Kherson Oblast (province), Ukraine, which is in a state of disrepair. As part of this work is an an evaluation of the current technical condition of the pipeslines of the first and second rows of the suplly. Subsequently, the design of the reconstruction of the section is then carried out using selected remediation technology.

This diploma thesis deals with Bisphenol A, especially with its impact on the aquatic ecosystem. Information about its properties, production and current use are summarized here. Its harmful impact on the environment, especially on the aquatic ecosystem and the human body is characterized. Also the methods of its degradation within the aquatic environment have been described. A summary of the options of a determination of Bisphenol A in water samples is incorporated and the method of gas chromatography with mass spectrometry (GC/TOF MS) and comprehensive two-dimensional gas chromatography with mass spectrometry (GCxGC/TOF-MS) is compared in the experimental part. Analytical determination precedes the isolation of the analyte from the water samples by solid phase extraction (SPE) using SupelcleanTM ENVITM - 18 and derivatization using the silylation reagent, N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA). The result of this work is the analysis of a series of real samples from wastewater treatment plants Brno Modřice and Luhačovice by a two-dimensional gas chromatography with mass spectrometry (GCxGC/TOF-MS).

Synthetic musk compounds are artificial organic substances commonly used as fragrant constituents of personal care products as parfums, cosmetics, detergents, in-house cleaning and washing agents. Given their large area of applications and their ability to be persistent, they leaked into all parts of ecosystem, especially aquatic one. There have been a big focus on studiyng these compounds, their properties and fate in the different parts of ecosystems in the last years. The aim of master's thesis was carry out the determination of five representatives (habanolide, exaltolide, ambrettolide, musk MC4 and ethylene brassylate) of macrocyclic musk compounds in waste water samples from influent and effluent of three water treatment plants (WWTP Brno-Modřice, WWTP Lednice and WWTP Mikulov). One of the main tasks was to perform a method optimisation for the determination of selected musk compounds in waste water and evaluation and interpretation of the results. Solid phase microextraction (SPME) technique was used for the extraction of analytes, consequently gas chromatography-mass spectrometry was used for analysis of selected analytes. Following evaluation the removal efficiency of musk compounds in the waste water treatment plant was assessed.

Main intention of the thesis is to name and explain budgeting methods of building constructions with main focus on creating budget for water management and engineering structures. The practical part presents itemized budgets for a wastewater treatment plant and a bicycle trail. After that the price determined of the itemized budget is compared to the price determined by budget indicator.

This diploma thesis explores treatment options of wastewater with a low presence of organic pollution produced by minor pollution sources. The research part describes objects with a low presence of organic pollution in wastewater and possible treatment methods in dependence of pollution source's size. The practical part contains the design of technological options of treatment of wastewater with a low presence of organic pollution for a specific object.

Objectives of this master's thesis are to process review of technologies used to treat wastewater in alpine environment in Slovakia and in foreign countries. Thesis also includes mapping of situation of chosen alpine cottages in High Tatras. For cottages with unsuitable technology will be suggested more suitable solution.

This master’s thesis is focused on the business risk protection in construction projects. The first part is dedicated to an interpretation of theoretical knowledge which defines and describes the risk, acquaints readers with principles of the risk management and presents commonly used forms of the business risk protection in practice. The second part deals with a practical use of the protection tools and proposes their effective adjustment in the selected public works contracts.