SU1333652A1 - Installation for biological treatment of waste water - Google Patents

Abstract

The invention relates to sewage treatment plants and can be used for the biological treatment of domestic and related industrial wastewater. The purpose of the invention is to increase the degree of water purification and increase the oxidizing power of the plant. The installation contains aeration tank 1 with pipelines 2 and 3 for supplying source water and draining a mixture of purified water and activated sludge, pipelines 4 and 5 of circulating and surplus active sludge, flotator 6, vacuum pump 7, surface aerators with an annular water outlet port 8 and pump 9 and disk 10 with attached. to its peripheral part by a cone-shaped ring 11, an aerator exhaust duct with an inlet 12 and an outlet 13, a source of technical oxygen 14 with pipelines 15 and 16, a drainage pipe 17 for purified clarified water, an activated sludge discharge pipe 18, an air-gas cavity 19. The installation provides increased efficiency of activated sludge. Due to this, there is no need for a device for regenerators to restore its oxidative capacity — it will be extremely high at all stages; this is also facilitated by the absence of zones with a low content of dissolved oxygen, i.e. no zones where activated sludge can be oxygen deprived. 2 Il. 7 SL FIG. f

Description

The invention relates to sewage treatment plants and can be used for the biological treatment of domestic and related industrial wastewater.

The purpose of the invention is to increase the degree of water purification and increase the oxidative capacity of the plant.

FIG. 1 shows the proposed wastewater treatment plant, a longitudinal section in FIG. 2, the same plan.

The installation contains an aeration tank 1 with supply lines 2 for source water and removal 3 for a mixture of purified water and activated sludge, pipelines circulating 4 and excess 5 activated sludge, flotation cell 6, vacuum pump 7, JQ rantry removal of all pops, near-surface aerators with annular water outlet hole 8, pump 9 and disk 10 with a conical shape attached to its peripheral part

sludge to the surface of the water in the flotation device and a significant reduction in energy and capital expenditures on the organization of the separation of the active ring 11, the aeration channel of the aero silt from the purified water. A vacuum pump with an inlet 12 and an outlet 13 results in a more complete removal, the source 14 is technical, from active production oxygen sludge with pipelines 15 and 16, making them more viable than carrying out 17 of the cleaned the conditions for the subsequent water are clarified, the pipeline 18 for the removal of more intensive penetration sludge 18, the gas-air cavity 19. neither the dissolved oxygen to a relatively greater depth or more, which increases the quality of the activated sludge and significantly increases Its oxidative power is high. Finally, the monolithic structure of active sludge pops is disrupted in the flotation unit — only some additional dd impact II will be required to break the pops and divide them into smaller ones, which is subsequently implemented on the return path of the circulating part of the active sludge from the flotator back to the aero tank.

The plant for biological wastewater treatment works as follows.

The aero tank is filled with a mixture of source water with activated sludge. The vacuum pump 7 of the flotator 6 is turned on. Under the influence of the atmospheric pressure in the aeration tank and the vacuum in the floater 6, a mixture of purified water with active sludge flows from the aeration tank to the flotation unit located. Due to the decrease in pressure in the flotation cell 6 and the pipeline 3, the dissolved carbon dioxide and other gases, the products of the vital activity of the activated sludge, are deaerated from the liquid phase of the active sludge populations. The deaeration process proceeds rapidly, which is explained by the high concentration of gases dissolved in the activated sludge, approaching equilibrium gas-liquid (for carbon dioxide, this is approximately one to one part by volume for each pressure differential atmosphere). The presence of a lower concentration of dissolved gases in the treated water is due to the fact that the liquid phase of the cotton

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45,

This clears the additional surfaces of the slabs of activated sludge, which are not in contact with the organic water being purified and are capable of

50 reason for more intensive cleaning work. Due to intensive forced dividing of all slabs of activated sludge into smaller ones and occurring at different sites along the 55 surfaces of newly formed pops, different stages of mineralization of dissolved organics — on already involved sites of surfaces, the oxidation of sorbed organic sludge by external currents does not turbulence and atmospheric air is not ventilated, therefore diffusion of gases dissolved in it of increased concentration to the surface of pops of activated sludge and further into the treated water. proceeds slowly. As a result, gas cavities are formed inside the slags of activated sludge, the larger the larger, the more rapidly and by a large amount the pressure in the medium changes. The claps acquire a spongy, friable structure-RU, which leads to the following.

Due to this, the density of pops of activated sludge is significantly reduced compared to the density of water, which provides accelerated and hectares

25 dd

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sludge to the surface of the water in the flotation device and a significant reduction in energy and capital costs for organizing the separation of active 5 sludge from purified water. Vacuuming results in a more complete removal of active sludge from the products of their livelihoods, which ensures the conditions for the subsequent more intensive penetration of dissolved oxygen to a relatively greater depth and in greater quantities, which increases the quality of the active sludge and significantly increases its oxidative capacity. And, finally, the monolithic structure of active sludge pops is broken in the flotation unit — only some additional impact II is required to break the pops and divide them into smaller ones, which is carried out later on in the return path of the circulating part of the active sludge from the flotator back to the aero tank.

five ,

This clears the additional surfaces of the slabs of activated sludge, which are not in contact with the organic water being purified and are capable of

0 reason for more intensive cleaning work. Due to intensive forced dividing of all slabs of activated sludge into smaller ones and occurring on different parts of the surface of newly formed pops, different stages of mineralization of dissolved organics — the oxidation of sorbed organic matter on the silt in the aeration tank continues in the already involved areas of surfaces, after returning back to the aerotank (due to the short residence time in the floater), and again the surfaces forcibly opened can take new portions for p contaminants for purification sludge without regeneration. This is not only

the oxidizing agent is additionally increased. The power and operability of activated sludge is bore above the water outlet ring annulus, but it also provides both more uniform extraction of organic matter from wastewater and more uniform oxygen consumption at various stages of its mineralization.

The clarified purified water is removed from the bottom of the flotation cell 6, and the activated sludge is taken from its upper part from the surface of the purified water. The circulating part of the sludge is pumped through the surface aerator back to the aeration tank. In this case, the pump and the aerator, besides its functions, perform along the way an additional one - crushing loose active sludge claps having a spongy structure into smaller claps with elimination of gas-filled cavities inside them.

In the circulation aerator, the sludge is emitted into the atmosphere from the annular opening 13 in the form of a continuous umbrella flow with a closed gas-air cavity beneath it that does not communicate with the atmosphere. The umbrella flow from the circulating active sludge is oxygenated from both sides - with external atmospheric oxygen, and with internal or technical, or also atmospheric oxygen supplied under a slight excess pressure to prevent it from entering the atmosphere through the umbrella flow. To prevent carbon dioxide from penetrating from the aerotank into the cavity under the umbrella flow, this cavity 19 is separated from the water in the aeration tank by a gas-tight disc 10 and a load of 8.

The missing part of the oxygen is introduced into the aero tank with the help of additional surface aerators of the ana-Ig LOGICHI design, working on the purified water, partially circulated through the aerators.

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Claims (1)

Invention Formula thirty A plant for the biological treatment of wastewater, containing an aeration tank with aerators and pipelines, supplying raw water and draining a mixture of purified water and activated sludge, circulating and excess activated sludge pipelines, a flotator for separating activated sludge from water, in order to increase the degree of water purification and increase in the oxidizing capacity of the plant; the flotation cell is sealed and equipped with a vacuum pump; the aerators are made surface with an annular outflow outlet and with a pump circulating in them Activating sludge, each aerator is equipped with a disk located under the water outlet hole, with a cone-shaped ring attached to its peripheral edges, as well as a venting channel, the inlet of which is located under the disk, and the code one above the water outlet hole; with pipelines leading it through the discs to the water outlets. 35 attached to its peripheral edges cone-shaped ring 11, partially immersed in water. Oxygen in the cavity under the umbrella flow is supplied through the pipeline through the hole in the disk. The gases accumulated under the disk are vented to the atmosphere through an outlet 13 located STI 8. The missing part of the oxygen is introduced into the aero tank with the help of additional surface aerators of the ana-Ig LOGICHI design, working on the purified water, partially circulated through the aerators. 20 Invention Formula 0 A plant for the biological treatment of wastewater, containing an aerotank with aerators and pipelines, feed water and discharging a mixture of purified water and activated sludge, circulating and excess activated sludge pipelines, a flotator for separating activated sludge from water, in order to increase the degree of water purification and increase in the oxidizing capacity of the plant; the flotation cell is sealed and equipped with a vacuum pump; aerators are made surface with an annular outflow outlet and with a pump that feeds them into Activating sludge, each aerator is equipped with a disk with a cone-shaped ring attached to its peripheral edges, and a gas outlet channel, the inlet of which is located under the disk, and the code above the water-through hole, the installation is supplied with a source of technical oxygen with pipelines through the discs under the water outlet holes. five "M" and 5J in "m Editor H, Shvydka Compiled by P. Khlopenkov Tehred L. Serdyukova Korrek, Tor G. Reshetnik Order 3921/21 Circulation 850 VNIZhSH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Subscription