SU1240842A1 - Method of releasing waste water into water basins - Google Patents

Description

This invention relates to the protection of waters from pollution by household and industrial wastewater produced in estuaries, sea and lake bays.

The purpose of the invention is to increase the reliability of protection against contamination of water sites.

FIG. Figure 1 shows the graphs of the synchronous change in time of the velocities and directions of currents, the water level in the reservoir, and the discharge of wastewater; in fig. 2 shows the device by which the proposed method is carried out.

FIG. 1 is indicated: H - change of water level in a reservoir, cm; , - speeds of surging and cyclone currents, respectively, in the projection onto the longitudinal axis of the reservoir, cm / s; wastewater flow, t - time, h.

The device (Fig. 2) contains an outlet 1 connected to a waste line 2, a water level sensor 3 in the reservoir for controlling the valve 4, a reservoir 5 of waste water, a water use location 6. Large arrows indicate the direction of surge (dashed) and driven (continuous) flows in the reservoir. The small arrows indicate the outflow of wastewater from the release.

The method is carried out as follows.

Wastewater begins to be released into the reservoir only at flow rates in the reservoir of not less than 5 cm / s, at lower speeds the entire flow of wastewater is directed, for example, B, the reservoir. 1 per hour, reaching a value of g 5 mz / s.

When reaching a speed of cm / s, the discharge of wastewater begins at a rate of 0.08 per hour and at an extreme value of the water level in the reservoir H 80 cm, the discharge of wastewater stops.

The duration of the release of wastewater, h

The maximum consumption of wastewater in the reservoir,

Q, mz / s

Concentration at the site of release (SC)

Concentration at a distance of 1 km from the target range

Thus, in the bay, the maximum permissible concentration of contaminants is ensured already at the initial dilution at the outlet.

0

five

0

five

0

The flow reversal takes place in 0.5 hours, after which the wastewater flow begins to increase again.

During the time of action of surge currents, the water masses move from the release to a distance of 5200 m in the direction of the top of the bay, then by the same amount in the direction of the open water body. With the continuous release of sewage, repeated application of pollution fields would occur, and with a variable wastewater flow, the concentration fields of the pollutant would not overlap.

At flow rates of more than 5 cm / s, wastewater flow synchronously increases with intensity Aqj, j, j, and Q values are reached, then reduced with intensity O at flow rates of less than 5 cm / s in the reservoir.

This cycle is repeated many times.

The management of changes in wastewater discharges is carried out, for example, by means of a valve 4 on the discharge end (Fig. 2). The control signals for the action of the valve may be, for example, signals from any known flow rate sensor installed in the discharge area, or any known water level change sensor installed off the coast of the reservoir.

As a result of the implementation of the proposed method, at any direction and speed of currents in the reservoir, the calculated concentrations of pollutants that do not exceed the maximum allowable will be provided.

Example 1. The speed of the currents in the reservoir is less than 5 cm / s. The sewage waters are not released into the reservoir, but sent to the reservoir. Natural background concentrations are provided in the reservoir.

Example 2. The rate of surge currents in the reservoir cm / s. The results of the calculations are as follows:

Discharge from storage 0.4 0.8 1.2 1.6 2.0

1SCHK MPC DCC MPC MPC

MPC MPC MPC MPC MPC

Example 3. Speed of currents in a reservoir (.5 cm / s.

The results of the calculations are as follows:

The duration of the release of wastewater, h

The maximum consumption of wastewater in the reservoir,

Q, mz / s

Concentration at release

Concentration at a distance of 1 km from the release

Thus, the excess of the maximum permissible concentration of the MPC takes place only at the outlet with a maximum flow rate of wastewater in the reservoir, exceeding 1.2.

Variable wastewater discharge allows using for the intensive dilution of wastewater without imposing pollution fields on each other the entire range of current flow rates in the reservoir, and at low flow rates of wastewater 234

Discharge from storage 0.6 0.9 1.2 1.5 1.8

MPC MPC 2PDK ZPDK 4PDK MPC MPC MPC MPC MPC

These waters are not discharged into the water at all or are discharged with a corresponding low flow rate, ensuring their dilution to the required concentrations. The maximum discharge of wastewater occurs at maximum flow rates in the reservoir, when sufficient initial and primary dilution is ensured. As a result, high water quality is constantly ensured in water use places, i.e., they are reliably protected from contamination.

Compiled by E. Yashkova

Editor Y. SeredaTehred I. VeresKorrektor M. Maksimishinets

Order 3461/24 Circulation 688 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Fzg, 2

Claims (1)

METHOD FOR DISCHARGEING WASTE WATER TO WATERS through a pressure sewer collector, characterized in that, in order to increase the reliability of protection against pollution of water use places, the discharge of water through a sewer collector begins at flow rates in the water body exceeding 5 cm / s and simultaneously increase their discharge speed with increasing flow rates in the pond. N Ong SU. „, 1240842 Mouth Mouth (m ³ / s) (cm / s) figure 1