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Didžiausiais paviršinių nuotekų teršalais laikomi naftos produktai ir skendinčiosios medžiagos. Pastarąsias galima nesunkiai pašalinti taikant tradicinius paviršinių nuotekų valymo metodus, tokius kaip nusodinimas, o naftos produktų šalinimui reikalingas antrinis nuotekų valymas. Vienas efektyviausių NP šalinimo iš nuotekų būdas yra filtravimas pro sorbuojančiosios medžiagos filtrą. Nors šiuo būdu valant nuotekas galima pasiekti didelio teršalų šalinimo efektyvumo, praktiškai dažnai susiduriama su problema, kai į eksploatuojamuosius valymo įrenginius nuotekos atiteka dideliais greičiais ir teršalai nėra iki galo pašalinami. Todėl šiame darbe buvo atliktas trijų skirtingų sintetinių sorbentų („Fibroil, „Duck“, „Reo-dry“) efektyvumo šalinti iš paviršinių nuotekų naftos produktus ekstremaliomis sąlygomis (esant dideliems greičiams) eksperimentinis tyrimas. Atlikus bandymus su dirbtinėmis ir realiomis paviršinėmis nuotekomis laboratoriniame stende, nustatyta, kad visų trijų sorbentų efektyvumas šalinti NP yra panašus ir skendinčiosios medžiagos bei nuotekų drumstumas neturi įtakos NP šalinimo efektyvumui. Tačiau „Fibroil“ sorbentą naudojant kaip filtro užpildą, 30 m/h greitį galima išlaikyti gerokai ilgiau nei su sorbentais „Duck“ ir „Reo-dry“ ir šį sorbentą naudoti ekonomiškiausia. Darbą sudaro 8 dalys: įvadas, darbo aktualumo aprašymas, literatūros apžvalga, tiriamojo darbo metodikos aprašymas, eksperimeto rezultatai, rekomendacijos ir išvados bei literatūros sąrašas. Darbo... [toliau žr. visą tekstą] / Suspended solids and oil products are considered as the most important pollutants in the storm water. As suspended solids can be easily retained from storm water by simple sedimentation, for oil products it is usually needed to have a secondary treatment: filtration through sorbents media. Although storm water filtration through a sorbent filter gives high treatment efficiency, it is usually impossible to ensure the right speed of storm water coming to the treatment facilities (it is usually too high to ensure an efficient sorption). For this reason the research and analysis of three different synthetic sorbents („Fibroil“, „Duck“, „Reo-dry“) were performed with artificial and real storm water in the laboratory under extreme conditions (filtration speed 30 m/h). According to the results of the experiment, all three sorbents have similar treatment efficiency and suspended solids and turbidity has no impact on oil products removal efficiency. But it is more efficient to use “Fibroil” and it is suitable for filtration under 30 m/h speed much longer than sorbents “Duck” and “Reo-dry”. Structure: introduction, relevance, methodology, results of the experiment, recomedations conclusions and references. Thesis consist of: 55 p. text without appendixes, 21 pictures, 8 tables, 39 bibliographical entries.

In the Master’s Thesis “Pre-investigation of Stormwater Quality at Metals Scrap Processing Plant” the literature review of 136 sources was performed with the focus on storm water pollution, physical and chemical properties of specific pollutants, origins of the pollution and pathways of the pollutants transport to the environment. Types of industrial storm water samples and sampling methodologies are described as well. Raprinfall data calculation are performed for the design of industrial storm water collection and treatment systems. The comprehensive analyses of storm water treatment are done. The experimental part of the work was carried out at the metal scrap processing industry with paved and unpaved aeries of the surfaces. During the research the industrial storm water screening characterisation was done at different locations of the whole territory. The treatment technology, including the sedimentation tank, retention tank and filtration trench was selected and calculated for the treatment of storm water of the investigated industry. The generalized conclusions and results of the work can be useful for state institutions, research institutions and the enterprises engaged in storm water management.