Investigations of the pollution of surface (rain) wastewater and its impact on the environment
2006
Steponavicius, A.
The paper presents the analysis of legal acts and normative documents regulating the management of surface (rain) wastewater in Lithuania. On the basis of the results, the investigations on treatment efficiency of pollution of surface wastewater accumulated in the territory of the cattle and pigs slaughterhouse of Krekenavos mesa Ltd were carried out. Having applied differentiated runoff coefficients calculations of the dependence of wastewater amount territory of the company were suggested. According to the monitoring program, wastewater pollution indices and investigation frequency were determined in respect of the requirements of surface water monitoring. Wastewater pollution dynamics in treatment facilities of the company was estimated. As it was determined, the main index specifying treatment necessity of subsurface wastewater accumulated in company's territory is suspended solids. Considering this index it was determined that maximum wastewater pollution exceeded the determined rate of environmental requirements 2.13 times within the study period. After treatment in the facilities, the average wastewater pollution with suspended solids decreased from 31.44 mg lE-1 to 8.67 mg lE-1. Other pollutants concentrations contained in wastewater were insignificant and did not exceed the rate determined in the environmental requirements, thus they may be released into open water bodies. It was also determined that the average amount of suspended solids contained in the Upyte stream reached 17.55 mg lE-1. Considering this index, pollution of wastewater outlet is 50.6% lower than the background pollution of the stream.
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