SU1231006A1 - Plant for biological purification of waste water - Google Patents

Description

This invention relates to the treatment of domestic and industrial wastewater.

The purpose of the invention is to increase the efficiency of use of the plant and its reliability.

Figure 1 shows the proposed installation of biological wastewater treatment; figure 2 - node 1 in figure 1; on fig.Z - section aa in figure 2.

The installation includes a receiving chamber 1, grids 2, sand traps 3, primary settlers A, aerotanks 5, secondary settlers 6 connected by a gravity flow pipe 7 to a pumping sludge station 8, a discharge pipe 9 for pumping recycled activated sludge from pumping station 8 to aeration tanks 5 and pressure pipeline 10 for pumping excess activated sludge from pumping station 8 to receiving chamber 1. A vertical pipe П is located above the water level in the receiving chamber 1, to which pipe 10 is tangentially attached, and in the lower part The tubes 11 are fitted with paddles 12.

The proposed installation works in the following way.

Sewage fluid enters the receiving chamber 1, where it is pre-mixed with excess activated sludge, saturated with atmospheric oxygen, and sent to grids 2. When waste fluid with sludge flows through the grids 2, they are finally mixed with the simultaneous retention of large contaminants. After gratings 2, the mixture flows by gravity into sand traps 3, where at relatively low speeds of movement of the vehicle, heavy mechanical impurities (sand) precipitate and air bubbles float, which float small organic substances and keep them in a suspended state, thereby improving sediment quality in sand catchers.

After the sand traps 3, the mixture of waste liquid with sludge is directed to the primary sedimentation tanks 4, where it moves at a speed not exceeding 10 mm / s. When the mixture enters the sedimentation zone of the primary sedimentation tanks 4, the processes of flocculation and sedimentation of suspended substances and sludge occur simultaneously;

310062

excess activated sludge is precipitated. Sediment of coagulated vzveknyh substances and sludge from primary clarifiers 4 is fed for further 5 treatment (for example, digesters), and clarified wastewater is supplied for biological treatment to aerotanks 5, to which to maintain the biological treatment process from 0 pine station 8 through a pressure pipe 9, circulating active sludge is directed.

The silt mixture from the aeration tanks 5 enters the secondary settling tanks 6,

 5 where it is separated into treated wastewater and activated sludge, which is precipitated. The sludge deposited in the sediment is collected by the chopper and then through the self-flowing pipe 7 enters the pump

20 station 8. Circulating activated sludge through pressure pipe 9 is supplied from pumping station 8 to aerotanks 5, and excess activated sludge from pumping station 8 is fed through pressure 5 th pipeline 10 to receiving chamber 1. Excess activated activated sludge entering into receiving chamber 1 is carried out through a vertical pipe 11, to which a tangentially attached to the porous pipe 10. As a result of a tangential supply of activated sludge to a vertical pipe 11, the sludge flow is intensively twisted in it to form a vacuum cavity in

35 center. Through the upper open part of the vertical pipe 11, air from the atmosphere is drawn into the vacuum cavity that has arisen, and it is mixed with active sludge.

40 To crush air bubbles and dissolve them intensively in activated sludge, blades 12 are installed, which spin the flow in the opposite direction, creating additional turbulization of the air-air mixture. At the outlet of the vertical pipe 11, a sparse turbulent stream of sludge mixture is sprayed, which creates conditions for

50 additional intensive natural flow aeration.

The combination of the biocoagulation process with sedimentation in the sedimentation zone in primary sedimentation tanks eliminates the need for a biocoagulation chamber device, creates optimal conditions for the formation of flakes and their sedimentation, while excluding the flotation process. Feeding all the excess activated sludge into the receiving chamber eliminates the sludge compacting.

The use of forced natural aeration of all excess activated sludge with atmospheric air in front of the receiving chamber allows the concentration of dissolved oxygen in the amount of 1.5–2 mg / l to be reached in the waste liquid, which is sufficient for an effective bio-coagulation process

This makes it possible to eliminate compressed air supply.

Thus, increasing the effect of wastewater treatment in primary-settling tanks, improving the quality of sediment in sand traps, eliminating the bio-coagulation chamber, sludge compactors and supplying compressed air to the biocoagulation allows for more efficient use of the installation, reliability of its work, and also reducing se.- ; the cost of wastewater treatment.

A-1

eleven.

figs

ipuff.Z

Compiled by L. Sukhanova Editor M. Petrova Tehred M. Khodich Corrector S. Shekmar

Order 2518/27 Circulation 864 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Razppskaya nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

INSTALLATION FOR BIOLOGICAL WASTE WATER CLEANING, containing in series a receiving chamber, grates, sand traps, primary sumps, aeration tanks, secondary sumps connected to a sludge station by a gravity pipe, pressurized circulating activated sludge pipelines to aeration tanks and excess activated sludge, that, in order to improve the efficiency of use of the installation and the reliability of its operation, the pressure pipe of the excess sludge is connected to the receiving chamber, which is equipped with a zhennoy over riser fluid level with blades mounted in its lower portion, the excess sludge conduit tangentially connected to a vertical tube receiving chamber. g "_SU. "And _1231006 A1