Sepideh Khatib Haghighi; Hojjat Khodaparast
Volume 10, Issue 3 , September 2012, , Pages 57-68
Abstract
For this survey, eight stations were selected in the Anzali Lagoon based on vicinity to the urban area, agricultural fields, in lets and out lets of the rivers. Sampling was carried out seasonally and in each season triplicate water samples were taken from surface layer of each station. Totally 96 water ...
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For this survey, eight stations were selected in the Anzali Lagoon based on vicinity to the urban area, agricultural fields, in lets and out lets of the rivers. Sampling was carried out seasonally and in each season triplicate water samples were taken from surface layer of each station. Totally 96 water samples were collected during one year period in sterile condition.Samples were transferred to the laboratoray at 4ºC temperature using ice box. The pollution by Coliform was examind using standard technigue of MPN and for count of bacteria differential, specific test and pourplate method isolate was used. In this survey different genus of bacteria were isolated and identified as: E.Coli (%19.65), Shigella (%18.21), Klebsiella (%17.86), Proteus (%13.21), Enterobacter (%11.07), Morganella (%9.65), Salmonella (%3.92), Serratia (%2.5), Providencia (%2.14) and Citrobacter (%1.79) which belonged to family Enterobacteriacea. Also the most important isolated genus of Vibrionacea were Vibrio (%47.55), Aeromonas (%28.67) & Plesiomonas (%4.9) and nonfermented-bacilli containg Suedomonace (%18.88). There was significant differences in the bacterial pollution between stations (P<0.05). The highest Coliform count was recorded during summer amounting to (147.71±171.36) ind. 100 cm3 and also the highest Fecal Coliform count was observed in summer (135.125±173.19) ind. 100 cm3 in the water. Generally the pollution in summer was higher in comparison to rest of the year due to increasing temperature and decreasing water flow of rivers.Higher bacterial pollution during autum in comparison to winter was attributed to heavay rain, erosion of the soil, flooding of the rivers and run off of the waste waters. Pirbazar river, Psikhan and Shambe Bazaar Roga drained high volume of urban agricultural and animal waste waters.The western area of the lagoon which is the bigest part of the Anzali lagoon had the least pollution.