14. starptautiskā konference 2012 - Latvijas Jūras akadēmija

Concentration, mg/m 3Proceedings of 14th International conference „Maritime Transport and Infrastructure - 2012”calibrated every year by State limited liability company "Latvian Environment, Geology andMeteorology Centre".In the landing stages of tankers the company "Latvian West Terminal Ltd." is handling andtransferring only oil and liquid pyrolysis products, not chemicals. Total amount of transferred productsin period 1999-2011 (the period during which operates air monitoring station) reached maximum in2002/2003 (1.6 million tons annual) and is decreased to 0.62 million tons in 2011. Petroleum productassortment clearly changed since 2002 when the volatile petroleum products (gasoline, hexane,heptane fraction) were handled at very low amounts. The transport and handling of gasoline wasrestored from 2006. According to terminal reports in the 2011 th the terminal handled diesel (4.3thousand tons), spirits (180 thousand tons), jet fuel (110 thousand tons), pyrolysis and condensationresins (19.7 thousand tons), solvents and petroleum (total 298.4 thousand tons), absorbents - fuelimprovers - 613.7 thousand tons. Although the total volume of oil products handled at the terminal in2011 th is almost the same as last year, however, markedly increased handled light oil products(gasoline, solvents, crude oil), which are volatile and easily felt in the air as the bad smell. To transferheavy oil fractions, the rail tanks must be heated, and are therefore more additional resource ofmalodors.4. Analysis of results4.1 Concentrations of Benzene C 6 H 6Analysis of monitored benzene concentration in 2011 shows that there were number of highpollution episodes with increased benzene and toluene concentrations in Sarkandaugava region (seeFigure 2 with an episode of the 12 th August).Pollution episode in Tvaika Street August 12, 2011BenzeneToluene25020015010050000:00 02:03 04:07 06:11 08:15 10:19 12:23 14:26 16:30 18:34 20:38 22:42Fig. 2. Observed high concentrations of benzene and toluene in DOAS air pollution monitoring stationat Riga Harbour.It is observed that concentrations of benzene and toluene at the same time are rapidlyincreasing. It should be noted that there is no growth of sulphur dioxide or nitrogen dioxide pollutionat this time, what indicates that probably the source of contamination was leaking from the rail tanks.Weather in this day was hot with wind 4-6 m/s from Northeast. Probably train set with solvents in railtanks manoeuvre below the light beam of monitoring station.71