Abstract
The paper discusses investigation into uncleaned storm wastewater pollution with heavy metals in Vilnius Žirmūnai district. The goal is to determine the dependency of storm wastewater pollution with heavy metals on transport intensity. After determining this dependency, sweeps from street points is experimentally studied with the most intensive transport flows. As the street sweeps together with storm wastewater are both outflow from streets and through outflow pipes directly to the Neris, heavy metals in the outflow pipe sludge are also studied for each pool. The following heavy metals have been experimentally studied: Pb, Mn, Cr, Zn, Cu, Ni. The flame atomic absorption spectrometry method was used. The process of analysis is explained in short and its results are provided. A mathematical model by Phoenics 3.5 version program showing the distribution of heavy metals in the Neris river stream is made on the basis of the results received. Santrauka Nagrinejama nevalomu lietaus nuoteku tarša sunkiaisiais metalais Vilniaus Žirmūnu rajone. Siekiant nustatyti ryši tarp lietaus nuoteku užterštumo sunkiaisiais metalais nuo transporto eksperimentiškai tiriamos sašlavos nuo gatviu, kuriuos su lietumi išplaunamos i upe. Taip pat tiriami sunkieji metalai iš lietaus ištekamuju vamzdžiu i Neri. Eksperimentiškai nagrinejami šie sunkieji metalai: Pb, Mn, Cr, Zn, Cu, Ni. Tam panaudotas liepsnos absorbcijos spektrometrinis metodas. Trumpai aptariamas analizes procesas ir pateikiami tyrimu rezultatai. Remiantis gautais rezultatais sudaromas matematinis teršalu sklaidos modelis Neries upes tekmeje taikant Phoenics 3.5 programa. Резюме Исследуется загрязнение неочищаемых дождевых стоков тяжелыми металлами в районе Жирмунай г. Вильнюса. Для определения степени загрязнения дождевых стоков тяжелыми металлами от транспорта экспериментально исследовался мусор с улиц, вымываемый с дождем в реку. Также исследовались тяжелые металлы в дождевых стоках, попадающих в реку Нерис. Экспериментально с применением абсорбционно-спектрометрического метода исследовались тяжелые металлы Pb, Mn, Cr, Zn, Cu, Ni. Рассмотрен процесс анализа и результаты исследований. На основе полученных результатов составлена математическая модель распределения загрязняющих веществ в течении реки.
Highlights
Urban environment is a complicated system, because 70– 90% of all the soil lies under the streets, pedestrian paths, buildings and its natural environmental recovery takes a lot of time, a natural energy and material circulation are destroyed
The main goal of the investigation is to determine through experiment, the pollution of uncleaned storm wastewater, outflowing into the Neris river through outflow pipes, with heavy metals starting from Žirmūnai district and make a model for pollutant spread in the river stream
For acquiring the relation between storm wastewater outflow and those of heavy metals from the vehicles, the street sweeping samples from the street points having the greatest amount of vehicle flows and sludge samples from the outflow pipes in Žirmūnai district are taken
Summary
Urban environment is a complicated system, because 70– 90% of all the soil lies under the streets, pedestrian paths, buildings and its natural environmental recovery takes a lot of time, a natural energy and material circulation are destroyed. Street surface could protect soil from pollution like a filter, natural filtration disappears and in this way, pollutants , heavy metals in this case (zinc, copper, lead, manganese, nickel, chrome) from the streets flow to the waste pipes and directly to the rivers (German et al 2002]). Large amounts of transport pollutants go directly on the streets and around the driving part of the road (Jucevičienė 2003; Csereklye 2010). Most of the heavy metals from transport spread through flue gas, oils (during accidents), wearing tires and brakes, deteriorating street surface (Davis et al 2001; Sorme et al 2002). The main goal of the investigation is to determine through experiment, the pollution of uncleaned storm wastewater, outflowing into the Neris river through outflow pipes, with heavy metals starting from Žirmūnai district and make a model for pollutant spread in the river stream
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