Domestic/municipal and industrial wastewater management2007-12-22
Domestic wastewater shall be wastewater generated in households using water (e.g. as a result of washing of clothes, dishwashing, food preparation, showering, WC, etc.). Domestic wastewater shall also include wastewater resulting from the use of water for daily living needs of the personnel of enterprises, institutions and organisations, if they are collected and discharged separately from other wastewater generated on site. Municipal wastewater shall be domestic or mixed (domestic, run-off and/or industrial wastewater, infiltration water, etc.) wastewater collected using centralised collecting system. Industrial wastewater shall be wastewater generated as a result of production or any other economic/business activity. In 2012, about 179,5 million m3 of domestic/municipal and industrial wastewater were discharged into surface waters in Lithuania. It is 1,8 million m3 less than the previous years. The amount of untreated wastewater discharged into the natural environment decreased significantly compared to situation in 2002. In 2012, 97,23 percent of wastewater were treated according the standards. The amount of not sufficiently treated wastewater decreased and reached 2,75 percentage. There were almost no untreated wastewater in 2012. See the website of the Environmental Protection Agency for more information on the quantity and quality of wastewater discharged into the environment. Environmental provisions for the collection, treatment and discharge of wastewater are established by Order No. D1-236 On the Approval of Wastewater Management Regulation of the Minister of Environment of the Republic of Lithuania dated 17 May 2006. This legal act regulates the management of domestic/municipal wastewater collected using centralised collecting system, establishes terms for the discharge of industrial wastewater into environment and collecting systems and determines the environmental quality standards, i.e. the maximum allowable concentration of polluting substances in surface waters and in wastewater discharged into the environment. This regulation also states that the design of facilities should take into account the specific character of the object as well as the sensitivity of wastewater inlet, and to select the best suited wastewater management system as well as determine the required level of treatment that would not only meet the minimum limits of wastewater contamination but would also ensure that the allowable environmental pollution indexes are not exceeded during the operation of facilities. Effluent impact for surface water body is assessed according to organic pollution, total nitrogen and total phosphorus. As a result of these requirements, the settlement of wastewater management issues, especially in the case of individual dwellings not connected to centralised collecting systems, shall provide for new technological solutions allowing to increase the efficiency of wastewater treatment.