Sanitary classification of enterprises and production facilities

№	Class	Size of SPZ, m
	First
	Second
	Third
	Forth
	Fifth

The size of SPZ should be specified separately for different wind directions, depending on the results of the calculation of air pollution by the mentioned methods (ОНД-86[2.11]) and the average annual previously wind rose of the area of the enterprise location:

(3.20)

where: L is the calculated size of SPZ, m; L₀ is the established distance from the emission source to the border of SPZ, without correction for the annual wind rose, m; P is the averaged frequency of wind directions for considered rhumb,%; P ₀ is the frequency of wind directions of one rhumb,% (P₀=12.5%);

The residential construction, including individual houses, landscape and recreation areas, sanatoriums, collective or individual cottages, as well as other areas with regulated quality of habitat are not allowed to be located within the boundaries of SPZ.

Production facility or enterprises to serve the employees of such an object (non-residential premises for the alert emergency personnel, administrative buildings, research laboratories, clinics, sports and recreation facilities of closed type, motels, hotels, garages, playgrounds and facilities for storage of public and private transport, fire stations) are allowed to be placed within the boundaries of SPZ.

The normative size of SPZ should be specified by calculation and measurement methods taking into account actual air pollution and enterprise development perspective. In cases when the normative size of SPZ of the enterprise is not supported by calculation results according to methods (ОНД-86), the decision concerning the change of production technology should be considered to reduce harmful emissions into the atmosphere or otherwise conversion, or closure of the industrial object.

Example: define the maximum permissible emission sulphur dioxide and size of sanitary protection zone for a boiler plant of thermal power station taking into account the perspective of enterprise development and the average annual wind rose of the area of the industrial object location (input data in Table C.2).

The value of MPE of SO₂ for the boiler plant of the thermal power station is calculated by the formula (3.19) and some coefficients have been already estimated in the previous task (problem 3.2):

g/s

The size of SPZ for the boiler plant of the thermal power station is determined by the formula (3.20) taking into account the average annual wind rose of the area of the enterprise location (Fig.3.5, Table C.2).

In accordance with the sanitary classification of enterprises [3.1], the normative size of SPZ, L₀ =300 m (III class).

So, for north wind direction: m.

Calculation results for other wind directions are collected in Table 3.3.

Table 3.3

Дата добавления: 2015-11-16