In Tbilisi environs different types of mechanical engineering, oil refining, food industry facilities and various small enterprises do the industrial discharge. Not any of them has total cycle treatment facility (some of them do not have at all) and just some of them are satisfied with partial mechanical treatment.


Data source: Georgian Ministry of Environment, 1999.

Sewage system of the settlement located around Tbilisi is one more source of the pollution of surface waters, which is in dangerous state. One of them is Zhinval-Tbilisi sewage collector. In due time it was getting to the Gardabani treatment facility, passing through Tbilisi-Gardabani main collector. At present this collector is out of order and sewage of Dusheti and Mtskheta districts' settled areas gets directly to Mtkvari through Aragvi River. This problem is twice as dangerous from the standpoint of protection of environment and public health, since Tbilisi water supply intakes are located near Aragvi river. Tbilisi sewage system is served by Gardabani main treatment facility. To date it carries out just incomplete mechanical purification. Biological treatment does not take place here at all. 

Statistics of the discharge of water into the natural reservoirs shows, that in 1998 2.734 mln. m³ of water have been discharged, from which not a single cubic meter was normatively clean or treated .

In 1998 the following pollutants existing in the sewage were accounted: nitrates, iron, zinc, chromium, total BOD, suspended particles, sulfates, chlorides. Their qualitative dynamics in last three years is given in the chart.