Māris kļaviņŠ, azamat azizov, JĀnis zaļoksnis environment, pollution, development: the case of uzbekistan

Total nitrogen
Industry
6%
Wastewaters
50%
Total phosphorus
Every  type  of  pollution  is  characterized  by  certain  specific 
features,  but  largely  the  borders  between  the  effects  of  pollutants 
converge. Municipal wastewaters are more likely to have an 
increased content of various chemicals, but the industrial effluents 
bring the ever-increasing quantities of biogenic elements into the 
environ ment.  It  should  be  noted  that  the  waste  water  of  specific 
industries is characterized by a rather strictly determined spectrum 
of  specific  substances,  such  as  the  textile  industry,  polymer 
processing, chemical industry. 
Water contamination with organic substances always has a 
very complex and intricate character. Organic pollutants are able 
to actively interact with a variety of naturally-occurring substance 
groups. Another special feature of this group of substances is that 
they are actively transformed or destroyed by a variety of living 
organisms, primarily bacteria. 
Among the groups of substances which have recently been the 
focus of particular attention, the following should be noted: 
1)  plant protection products (herbicides, insecticides);
2) surfactants;
3)  petroleum products;
4) phenols;
5)  stable organic substances;
6)  toxic trace elements and heavy metals;
7)  carbohydrates, proteins, aminoacids.
The pollution of natural waters by oil or petroleum products is