RU2359922C2 - Method of waste water cleaning by intensifying waste water saturation with oxygen and related device - Google Patents

Abstract

FIELD: treatment facilities.

SUBSTANCE: invention may be used foe deep biological cleaning of domestic waste water in detached cottages, farmland houses, hotel complexes, schools and catering facilities. According to the invention two versions of method implementation are proposed. Both of them provide for air bubbles moving downwards (version 1) and upwards (version 2) and using related device. The device consists of a vertical pipe 5 installed with gap 7 as regard to tank bottom 1 and equipped with a nozzle 6 for waste water supply. Biological bed 8 and fine bubble diffuser 9 are installed vertically in the centre of the pipe 5. The tank 1 is ensured with two pairs of air lifts 12, 14 and connected with holding pond 4 via overflow conduits 2, 3. The holding pond is equipped with aearator 25, sludge re-circulation pump 24 and draining valve for clean water discharge. Interrelated shutoff valves 26, 27 are installed in the overflow conduits 2, 3. The device is also equipped with a control unit 19, compressor 20, changeover valve 21, and distributor 23 with regulator 22.

EFFECT: production of high-quality clean waste water, reduced power inputs at intensified cleaning, improved operational reliability of plant operation and reduced manpower during both production and operation processes.

4 cl, 2 dwg

Description

The invention relates to devices for deep biological treatment of domestic wastewater with activated sludge in suspension, used both in freestanding cottages, homesteads, and in hotel complexes, schools, sports clubs, towns, catering establishments, etc.

In biological wastewater treatment, activated sludge is used, which is a mixture of various bacteria and small microorganisms, but the activation process is possible only with the continuous presence of atmospheric oxygen with varying degrees of saturation, which ensures continuous interaction of wastewater with sludge in suspension and the oxidation process.

Known technical solution for the patent of Russia No. 2060967, class. C02F 3/02, 1995 "Method for the deep biochemical treatment of wastewater and an installation for its implementation", in which, according to the method, the feed wastewater is supplied, primary wastewater sedimentation, aeration, secondary sedimentation of the sludge mixture, ozonation, sludge recycling and discharge purified water. Installation according to this source of information consists of a primary sump, an aeration tank with an aerator, a secondary sump, sewage supply pipelines, sludge removal, activated sludge recycling, purified water discharge, as well as ozonation in the primary sump, an additional sump communicated with the primary sump, and a cleaned tank water and pipelines for sludge and activated sludge connecting the lower parts of all sedimentation tanks. However, this technical solution, both in part of the method and in the part of the device is very complicated and cluttered with unnecessary pipelines, and ozonizers are installed in inefficient places of the tanks.

A well-known model range of installations under the general name "UBAS", protected by patents of the Russian Federation No. 2201405, 2220112, 2228915 "Method of wastewater treatment and device for its implementation." These are fully automated systems of various difficulty levels. All these technical solutions contain an accumulative equalizing tank, where aerobic-anoxide biological treatment with aerobic activated sludge is carried out by supplying air in a rhythmic way, and the process of enzymatic decomposition of organic pollutants occurs. Next, pre-treated water with sludge enters the aeration tank - an activation tank, where the final destruction of organic pollution occurs, also by supplying air for the effective operation of sludge, after which the water enters the sump. The settled sludge accumulates at the bottom of the sump, and water, having passed a series of purifications through porous filters, is removed from the plants. The necessary air in these installations is supplied to the bottom of the tanks and, accordingly, air bubbles rise vertically, and therefore part of the volume in each tank is left without the required amount of oxygen.

The closest technical solution is the "Method of deep biological wastewater treatment and device for its implementation" according to the patent of the Russian Federation No. 2279407, class. C02F 3/02, 2006, which includes a leveling tank, an activation tank, a sump, a chamber with a porous filter, a sludge stabilization chamber, a piping system and pumps that provide forced pumping of water, and a control unit. This device and method for wastewater treatment provides for a more thorough water treatment, as it involves triple pumping and flowing of water, and accordingly its mixing with sludge, which is saturated with bottom aerators in each tank. However, the presence of three water flow chambers complicates the design of the device.

The technical task of the present invention is to provide a method and compact installation, ensuring the achievement of a technical result, which consists in obtaining high-quality treated wastewater, suitable for reuse, reduction of energy consumption during intensification of treatment, which consists in organizing a rational scheme of the process of enzymatic decomposition of organic pollutants, as well as the nitrification process denitrification and dephosphotation at all stages of wastewater treatment, thereby increasing re optional degree of wastewater treatment, as well as consisting in increasing the operational reliability of the installation and reducing the complexity of both its manufacture and its operation.

The specified technical result in terms of the method is achieved by the fact that a vertical pipe is installed on the bottom in the tank with a gap, equipped with a sewage pipe, a vertical biological load located in the center of the pipe and installed with the possibility of moving along the pipe with a fine bubble aerator, into which air is supplied pulsed, while the tank is supplied with at least two pairs of airlifts pumping water from the tank to the pipe, and the outlet pipes of the airlifts are located on the inner perimeter of would tangentially aerator mounted in the upper zone of the pipe in operation include all airlifts and airlifts total productivity is selected from the condition that the velocity of water over the overflow velocity of the bubbles, thereby allowing air bubbles move downward.

The specified technical result in terms of the method is achieved by the fact that a vertical pipe is installed on the bottom in the tank with a gap, equipped with a sewage pipe, a vertical biological load located in the center of the pipe and installed with the possibility of moving along the pipe with a fine bubble aerator, into which air is supplied pulsed, while the tank is supplied with at least two pairs of airlifts pumping water from the tank to the pipe, and the outlet pipes of the airlifts are located on the inner perimeter of the loss is tangential, the aerator is installed in the lower zone of the pipe, at least a couple of airlifts are included in the work, and the total performance of the airlifts is chosen from the condition that the speed of the overflowing water is less than the speed of movement of the bubbles, as a result of which the slow movement of air bubbles up.

The specified technical result in part of the device is achieved by the fact that a vertical pipe is installed in the tank with a gap relative to the bottom, equipped with a nozzle for supplying wastewater, and inside the center of the pipe there is a vertical loading and a fine bubble aerator installed with the ability to move and fix in the installed position, the tank is provided with at least two pairs of airlifts, the outlet pipes of which are located along the inner perimeter of the pipe tangentially, and located at different levels at overflow pipelines connecting the tank with a sump equipped with an aerator, a sludge recirculation pump and an outlet valve for the outlet of purified water, and overflow pipelines are equipped with interconnected shut-off valves.

The specified technical result in terms of the device is achieved by the fact that the device is equipped with a control unit interacting with each other, a compressor, a switching valve, a distributor with a regulator.

The invention is illustrated by the following drawings:

figure 1 shows the device;

figure 2 section aa in figure 1.

A device for treating wastewater with intensification of oxygen saturation consists of a tank 1 and an overflow pipe 2 connected to it, a lower 3 with a sump 4. A vertical pipe 5 is installed inside the tank 1, located in the center of the tank, and equipped with a sewage pipe 6 moreover, the pipe 5 is installed in the tank 1 with a gap 7 between the bottom of the tank 1 and the lower end of the pipe 5. Inside the pipe 5, a biological load 8 is installed, which can be either flat, passing through the center of the pipe, or cruciform ( not shown), as the intersection of two planar, and the center of the intersection coincides with the center of the pipe. A fine bubble aerator 9 is located inside the pipe, to which air is pulsed through the pipe 10. Fine bubble aerator 9 is installed with the possibility of movement along the pipe 5 vertically and its fixation in the desired location. The tank 1 is equipped with airlifts 11, 12, 13, 14, which transfer water from the tank 1 into the pipe 5, while the bent pipes 15, 16, 17, 18 of the airlifts in the pipe 5 are located tangentially along the inner perimeter of the pipe 5. The device is equipped with an interacting control unit 19 both with the compressor 20 and with the switching valve 21, which interacts by means of the regulator 22 with the distributor 23, and the switching valve 21 interacts with the sludge recirculation pump 24 of the sump 4, in which the sludge is deposited and where a bottom aerator 25 is also installed a, connected to the switching valve 21. Overflow pipes 2, 3 connecting the tank 1 to the sump 4, are equipped with interconnected valves 26, 27 that allow water to pass only one way, and if the valve 26 is open, then the valve 27 is closed and vice versa, this provides overflow water only through one kind of valve. The sump 4 is equipped with an outlet pipe 28 for the removal of purified water.

The device operates as follows. Wastewater through the nozzle 6 enters a vertical pipe 5, where they are treated with activated sludge in the presence of oxygen from the air coming from the fine bubble aerator 9, while the air is supplied to the aerator in a pulsed manner. When the device is operated according to the first method, a fine-bubble aerator is installed in the upper zone of the pipe and fixed. Then, all airlifts are turned on, by which water from the tank 1 is pumped into the pipe, i.e. is poured from above, and since the nozzles are installed tangentially, the water, spinning through the pipe, drops down, while the water pressure, additionally regulated by the regulator, is so strong that small air bubbles flow downward, thereby penetrating the entire liquid column into pipe, air interacts with sludge in suspension in water. When the water reaches the level of the overflow pipe 2, the treated water is poured into the sump 4. In the tank 1 in its upper zone, the water is in a soothing state, and the sludge settles in the lower zone of the tank, since the whole seething process of the interaction of water of sludge and air occurs in the pipe 5 . In the sump, the water settles and through the pipe 26 is removed from the device.

When the device is operated according to the second method, a fine-bubble aerator 9 is installed in the lower zone of the pipe 5, only part of the airlifts, but necessarily opposite to the center of the pipe, are included to better create a process of twisting water around the perimeter of the pipe. Bubbles of air with a smaller flow of water rise up, but slowly, since water poured from above inhibits their rise, thereby contributing to better contact of air with sludge, the water is purified by sludge in this bubbling stream. Since the fine bubble aerator is installed in the lower zone of the pipe, air also permeates the entire column of liquid in the pipe. In this case, water can be poured both through pipeline 2 and through pipeline 3. Pipelines 2, 3 are equipped with valves.

The proposed two methods and the device are energy-saving, and the device is reliable in operation, simple in design, cheap to manufacture and reliable in operation.

Claims (4)

1. The method of wastewater treatment, including the supply of wastewater to the tank, their biological treatment using activated sludge and a porous filter with a biological charge, the supply of treated water to the sump, characterized in that a vertical pipe equipped with a gap is installed on the bottom with a gap a sewage supply pipe, a vertical biological charge, located in the center of the pipe, and installed with the possibility of moving along the pipe with a fine bubble aerator, the air into which is supplied pulsed, while the container is supplied, at least two pairs of airlifts that pump water from the tank into the pipe, and the outlet pipes of the airlifts are placed tangentially along the inner perimeter of the pipe, the aerator is installed in the upper zone of the pipe, all airlifts are included in the work, and the total performance of the airlifts is selected from the condition that the flow rate the overflowing water is greater than the speed of movement of the bubbles, as a result of which the movement of air bubbles down is ensured. 2. A method of treating wastewater, including the supply of wastewater to a tank, their biological treatment with activated sludge and a porous filter with a biological charge, the supply of treated water to a sump, characterized in that a vertical pipe equipped with a gap is installed in the tank with a gap a sewage supply pipe, a vertical biological charge, located in the center of the pipe, and installed with the possibility of moving along the pipe with a fine bubble aerator, the air into which is supplied pulsed, while the container is supplied, at least two pairs of airlifts that pump water from the tank into the pipe, and the outlet pipes of the airlifts are placed tangentially around the perimeter of the pipe, the aerator is installed in the lower zone of the pipe, a pair of airlifts are included in the work, and the total performance of the airlifts is selected from the condition that the flow rate of the overflow water is less than the speed of movement of the bubbles, as a result of which the movement of air bubbles up. 3. A device for wastewater treatment, containing a tank, a sump, a chamber with a porous filter, a system of pipelines and pumps that provide forced pumping of water, and a control unit, characterized in that a vertical pipe equipped with a gap relative to the bottom is provided with a gap for supply sewage, and inside the center of the pipe vertically located biological loading and fine bubble aerator installed with the ability to move and fix in the installed position, while the tank is equipped with At least two pairs of airlifts, the outlet pipes of which are located tangentially along the inner perimeter of the pipe, and overflow pipes located at different levels connecting the tank with a sump equipped with an aerator, a sludge recirculation pump and an outlet valve for the outlet of purified water, and overflow pipes are equipped with interlocking locking valves. 4. The device according to claim 3, characterized in that it is equipped with a control unit interacting with each other, a compressor, a switching valve, a distributor with a regulator.

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