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Municipal sewage
Municipal sewage is the
dominant polluter of surface water by organic compounds (BOD),
nitrogen and phosphate compounds. The following rivers are polluted
most by municipal sewage.
·
Mtkvari
river basin
-
the
Mtkvari river downstream of Gori, Borjomi, Tbilisi, Rustavi cities;
-
the Vere
river within Tbilisi city limits;
-
the
Alazani river downstream of Telavi town;
-
the
Algeti river downstream of Marneuli town;
-
the
Suramula river downstream of Khashuri town.
·
Black Sea
basin
-
the Rioni
river down Kutaisi city and within the Poti town limits;
-
the Black
Sea at the coastline of Ajara and Abkhazia.
The
largest polluter of surface water is municipal wastewater (about 60%
of the overall waste-water). Centralized sewerage systems exist in 45
towns of Georgia, but the condition of the systems is very poor.
Wastewater treatment facilities exist in 33 towns with total capacity
of 1,640,200 m3/day. Traditional biological treatment
plants are present in 26 towns with a total theoretical capacity of
1,476,600 m3/day, whereas treatment plants with mechanical
treatment only are present in 7 residential areas with a total
capacity of 163,600 m3/day. The treatment plants were put
into practice in the period of 1972-1986. At this moment no treatment
plant can guarantee the biological purification of municipal sewage .
The steps of mechanical purification work to a certain degree on the
treatment plants of Tbilisi-Rustavi, Kutaisi, Tkibuli, Gori, Batumi
towns, but most of the treatment plants are out of order. The
construction of many treatment plants was not finished.
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