City waste water. OBZhD

BASICS OF SAFE LIFE
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City waste water. Basics of safe life

Fundamentals of Safe Life Activities (OBZhD)

A city with a million inhabitants annually discharges up to 350 million tons of polluted wastewater through the sewer network and in addition to it (including storm and melt water from industrial sites, city dumps, parking lots, etc.).

Composition and approximate amount of wastewater cities with a population of 1 million people (in thousand tons) are given below:

Polluted waste water	350 000,0
Including:
suspended solids	24,0
and phosphates	5,0
oil	2,5
synthetic surfactants	0,6

In addition to the above substances, very biologically active chemical elements are found in small quantities in the wastewater of a million city. Thus, the content of fluorine can reach 400-1000 tons, zinc - 25 tons, copper - 25 tons, arsenic - 14 tons, etc. Naturally, the content of these substances in wastewater is due to the industrial specialization of the settlement (this is fully of course refers to air pollution and solid waste).

Thus, urban wastewater plays an important role in the overall balance of substances entering and leaving cities. The "plume" of water pollution from large cities extends along natural watercourses for tens and even hundreds of kilometers and can adversely affect drinking water sources located downstream of the city's wastewater outlet.

Authors: Aizman R.I., Krivoshchekov S.G.

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