СНиП на английском языке SNiP 2.04.03-85
3.7. Used for waste water treatment in decentralized sewerage systems shall be filter pits, underground
filter beds, sand and gravel filters, filter trenches, air tanks for full oxidation, physical-chemical treatment
facilities for intermittently functioning objects (children summer camps, tourist camps, etc.).
3.8. For treatment of waste water of small dwelling areas, it will be expedient to use plants of factory
readiness as per GOST 25298-82.
3.9. For individual buildings with household waste water outflow rates up to 1 m3/day, it will be
permissible to use outhouses or cesspools.
3.10. Treatment of waste water of laundries contaminated with synthetic surface-active substances
(SAS) will be permissible to be combined with treatment of household waste water (sewage) if their ratio
is 1:9. In the case of waste water of collective bath houses-cum-laundries, the corresponding permissible
ratio shall be 1:4, and of waste water from bath houses, 1:1. It will be permissible to employ regulating
ponds, if appropriately substantiated.
When the amounts of waste water from collective baths-cum-laundries are significant, their
pretreatment to assure allowable synthetic SAS concentrations shall be designed.
3.11. When waste water is directed to treatment installations by pumps, the calculation of treatment
facilities of small dwelling areas shall proceed from the flow rates matching the capacity of the pumping
DESIGNS AND SYSTEMS OF SEWERAGE OF INDUSTRIAL ENTERPRISES
3.12. Water facilities and systems of industrial enterprises shall assure the maximum possible repeated
use (successive) of process water in individual process technologies, and also recirculation of cooling
water for individual shops or for the plant, as a whole. Unreplenished losses of water shall be
compensated for by collection of surface waste water and of household, urban and process waste water
after its appropriate treatment and disinfection (neutralization).
A once-through system of water supply for process purposes with discharge of treated waste water
into water bodies will be permissible only when appropriately substantiated and coordinated with the
water use and protection authorities and fishery protection bodies.
3.13. Selection of the sewerage type and system for an industrial enterprise shall account for:
feasibility of precluding formation of polluted waste water in a process technology by introduction
of waste-free and water-free technologies or of «dry» processes, by incorporation of closed water
systems, by using air-cooling technologies, etc.;
the requirements to the quality of water suitable for use in various process technologies and to its
the quantities and characteristics of waste water yielded by various process technologies, and the
physical and chemical properties of the contaminants contained; the material and energy balances of
water consumption and water withdrawal;
feasibility of local treatment of waste water flows for the purposes of recovery of individual
components and repeated use of the water, and also of creation of local closed recirculation systems of
process water supply;
feasibility of successive use of water in different process technologies with varying requirements
to its quality;
feasibility of withdrawal in a separate flow of waste water requiring local treatment;