RU2785423C1 - Wastewater treatment device - Google Patents

Abstract

FIELD: wastewater treatment.

SUBSTANCE: invention relates to the field of wastewater treatment. The wastewater treatment device comprises a housing 13 with an inspection neck 3, inside which there is a supply pipe 1, which is connected to the aerotank, which is connected to the housing 13 and consists of upper and lower tanks 7 and 12, which are inserted into each other with the formation of a slot 9 between their edges, as well as an overflow tray 4, which is connected to a discharge pipe 5. The upper container 7 is connected to the supply pipe 1. An aerator 10 is located inside the lower container 12, and the space between the wall of the upper container 7 and the wall of the housing 13 is a settling zone 6. The supply pipe 1 is configured to supply wastewater inside the aerotank, which is configured to accumulate wastewater and purify wastewater from suspended solids, organic contaminants and ammonium nitrogen using activated sludge accumulating during the operation of the device and air coming from the aerator 10 Slot 9 is made with the possibility of passing wastewater from the aerotank to the settling zone 6, which is configured to clean wastewater from activated sludge deposited on the walls of the upper tank 7 and then enters through the slot 9 back into the aeration tank.

EFFECT: creation of a wastewater treatment device with improved treatment efficiency, as well as easier to manufacture and maintain.

6 cl, 2 dwg

Description

The invention relates to the field of wastewater treatment, namely to wastewater treatment devices by aerobic methods in combination with anaerobic ones, and can be used for aerobic biological treatment of household wastewater of small volumes coming from private houses and cottages.

Closest to the claimed invention is a wastewater treatment device described in patent RU 2489366, which contains a housing with an inspection neck, inside which there is a supply pipe, which is connected to the aerotank, which is connected to the housing and consists of upper and lower tanks, which are made in in the form of a truncated pyramid and an inverted truncated pyramid and are inserted into each other with the formation of a gap between their edges, as well as an overflow tray, which is connected to a discharge pipe. The lower container is connected to the supply pipe, an aerator is located inside the lower container, and the space between the wall of the upper container and the wall of the lower container is a settling zone. The supply pipe is made with the possibility of supplying wastewater inside the aerotank. The aerotank is configured to accumulate wastewater and purify wastewater from suspended solids, organic contaminants and ammonium nitrogen using activated sludge accumulating during operation of the device and air coming from the aerator. The slot, under the pressure of wastewater coming from the supply pipe, is made with the possibility of passing wastewater from the aerotank to the settling zone. The settling zone is made with the possibility of wastewater treatment from activated sludge settling on the walls of the upper tank, and then falling through the slot back into the aerotank. The overflow tray is made with the possibility of additional purification of wastewater from suspended solids, foam and activated sludge, as well as with the possibility of pouring the treated wastewater into the discharge pipe. The discharge pipe is made with the possibility of discharging treated wastewater to the outside. This wastewater treatment device is selected as a prototype of the claimed invention.

The disadvantage of the wastewater treatment device of the prototype is the low efficiency of wastewater treatment, due to the constant leaching of activated sludge from the tank and the settling zone through the hole (13) in the wall of the settling zone.

The technical result of the invention is the creation of a wastewater treatment device with improved wastewater treatment efficiency, due to the absence of holes in the walls of the settling zone, as well as easier to manufacture and maintain, due to a simpler design containing fewer elements, namely due to the combination in a single section of the aeration zone and the sedimentation zone, as well as due to the lack of pumps and airlifts.

The set technical result is achieved by creating a device for wastewater treatment, containing a housing 13 with an inspection neck 3, inside which there is a supply pipe 1, which is connected to the aerotank, which is connected to the housing 13 and consists of upper and lower tanks 7 and 12, which are inserted into each other with the formation of a gap 9 between their edges, as well as an overflow tray 4, which is connected to the discharge pipe 5, while the upper container 7 is connected to the supply pipe 1, an aerator 10 is located inside the lower container 12, and the space between the wall of the upper container 7 and the wall of the housing 13 is the settling zone 6, and

- the supply pipe 1 is made with the possibility of supplying wastewater inside

- aeration tank, which is designed to accumulate wastewater and

wastewater treatment from suspended solids, organic contaminants and ammonium nitrogen, using activated sludge accumulating during the operation of the device, and air coming from the aerator 10,

- slot 9, under pressure coming from the inlet pipe 1 wastewater, is made with the possibility of passing wastewater from the aerotank into

- settling zone 6, which is made with the possibility of wastewater treatment from activated sludge deposited on the walls of the upper tank 7, and then falling through the slot 9 back into the aerotank;

- the upper part of the upper container 7 protrudes above the water surface;

- overflow tray 4 is made with the possibility of additional purification of wastewater from suspended solids, foam and activated sludge, as well as with the possibility of pouring treated wastewater into

- discharge pipe 5, which is designed to discharge treated wastewater to the outside.

In the preferred embodiment of the device, the upper and lower tanks 7 and 12 of the aerotank are made in the form of upper and lower truncated pyramids, which have no bases, and the lower truncated pyramid is inverted and the upper truncated pyramid is inserted into it with the formation of a gap 9 between the edges of the truncated pyramids.

In the preferred embodiment of the device, the upper container 7 is connected to the body 13 by means of fasteners 8.

In the preferred embodiment of the device, the lower container 12 is hermetically connected to the body 13 along the perimeter of the upper and lower base to form a sealed ballast compartment 11 with a filling hole, made with the possibility of filling with water when installing the wastewater treatment device.

In a preferred embodiment of the device, the overflow tray 4 has an arcuate shape and is located horizontally.

In the preferred embodiment of the device, the aerator 10 is fixed to the bottom of the housing 13.

For a better understanding of the claimed invention, the following is a detailed description with the corresponding drawings.

Fig. 1. Scheme of a variant of a wastewater treatment device (general view), made according to the invention.

Fig. 2. Scheme of a variant of the wastewater treatment device, in which the upper and lower tanks of the aeration tank are made in the form of upper and lower truncated pyramids, made according to the invention: a) side view in section; b) top view in section.

Elements:

1 - supply pipe;

2 - stiffener;

3 - viewing neck;

4 - overflow tray;

5 - discharge pipe;

6 - settling zone;

7 - upper capacity of the aeration tank;

8 - fasteners;

9 - slot;

10 - aerator;

11 - ballast compartment;

12 - lower capacity of the aeration tank;

13 - body.

Let us consider in more detail the embodiments of the claimed wastewater treatment device (Fig. 1, 2). The wastewater treatment device comprises a housing 13 with ventilation holes and an inspection hole 3. Inside the housing 13 there is an aeration tank, which consists of upper and lower tanks 7 and 12. The upper and lower tanks 7 and 12 are inserted into each other with the formation of a gap 9 between them. edges. Inside the housing 13 there is also a supply pipe 1, which is connected to the upper tank 7, and an overflow tray 4, which is connected to the discharge pipe 5. An aerator 10 is located inside the lower tank 12. The space between the wall of the upper tank 7 and the wall of the body 13 is a settling zone 6 .

In the embodiment of the inventive wastewater treatment device shown in FIG. 2, the upper and lower tanks 7 and 12 of the aerotank are made in the form of upper and lower truncated pyramids, which have no bases, and the lower truncated pyramid is inverted and the upper truncated pyramid is inserted into it with the formation of a gap 9 between the edges of the truncated pyramids.

The upper container 7 is connected to the body 13 by means of fasteners 8.

The lower tank 12 is hermetically connected to the body 13 along the perimeter of the upper and lower base to form a sealed ballast compartment 11 with a filling hole, made with the possibility of filling with water when installing the wastewater treatment device. This makes it possible to improve the stability of the device for sewage treatment in the ground, namely, to avoid extrusion of the device for sewage treatment from the ground, since the ballast water inside the ballast compartment 11 prevents extrusion.

Overflow tray 4 has an arcuate shape and is located horizontally.

The claimed wastewater treatment device (Fig. 1, 2) operates as follows. The inlet pipe 1 brings wastewater into the aerotank, which consists of upper and lower tanks 7 and 12. The aerotank accumulates wastewater and purifies them from suspended solids, organic pollutants and ammonium nitrogen, using activated sludge that accumulates in the aerotank during the operation of the device, and of the air coming from the aerator 10. The wastewater treated in the aeration tank through the slot 9, under the pressure of the wastewater coming from the supply pipe 1, enters the settling zone 6. In the settling zone 6 of which the wastewater is purified from activated sludge, which settles on the walls of the upper tank 7 of the aeration tank, and then enters through the slot 9 back into the aeration tank. The upper part of the upper tank 7 protrudes above the water surface, which prevents the water-silt mixture from flowing from the aeration zone to the settling zone along any other path except for the slot 9. The wastewater purified in the settling zone 6 enters the overflow tray 4, while being additionally cleaned of suspended solids , foam and activated sludge, due to the fact that the sides of the overflow tray 4 retain these substances. From the overflow tray 4, the treated wastewater is poured into the discharge pipe 5, which discharges the treated wastewater to the outside.

Wastewater is supplied to the upper part of the aeration zone (which is located inside the upper and lower tanks 7 and 12 of the aerotank), around which there is a settling zone 6 along the perimeter connected to the aeration zone by a slot 9. Being in the aeration zone, wastewater rich in organic pollutants serves to formation of a biocenosis of specific microorganisms called activated sludge. The contact time of free-floating activated sludge and waste water ensures complete oxidation of the contaminants contained in it. The water-silt mixture is displaced into the settling zone 6 by the next batch of incoming waste water. In the settling zone 6, gravitational settling of activated sludge takes place, and through the lower slot 9, the activated sludge returns to the aeration zone. Purified wastewater is discharged through the upper overflow tray 4 into the collection pipe 5. A spherical aerator 10 is installed in the aeration zone, which ensures saturation and mixing of the water-silt mixture, while not affecting the settling zone 6. Settling zone 6 is designed in such a way as to ensure transportation of settled sludge to the aeration zone and ensure its complete mixing with incoming wastewater.

The technical result is achieved due to the implementation in a small volume of the principle of the aerotank-sump, i.e. combining in one container the aeration zone (inside the aerotank) and the settling zone 6. The zones are interconnected by a slot 9, which ensures the flow of the water-silt mixture from the aeration zone to the settling zone and the return of activated sludge from the settling zone to the aeration zone. The key points in this are:

- the design of the bottom of the settling zone, which prevents the formation of stagnant zones.

- selection and installation of an aerator that provides optimal saturation with oxygen and mixing of the water-silt mixture while not provoking resuspension in the settling zone;

- organization of the movement of the water-silt mixture between the zones of aeration and settling due to the design features of the installation without the use of pumps and airlifts, which allows for optimal compressor performance and the efficiency of the aerator 10, because in most models on the market, compressors provide simultaneous operation of two systems: airlifts and aeration, which has a significant impact on process stability (pressure loss due to airlift(s) operation leads to a decrease in aeration intensity and, as a result, oxygen starvation of activated sludge , reducing its oxidizing power, deteriorating the quality of cleaning)

A significant advantage is its increased reliability, due to the absence of overflow pipes, valves, airlifts and bioloading, which minimizes the number of elements that can fail, which also greatly simplifies the maintenance of the device, which is reduced only to periodic (once in one - two year) to remove sediment from the aeration tank.

The compact wastewater treatment module provides, with proper operation (permanent residence of 2-5 people) and with minimal investment due to the maximum simplicity of design, the treatment efficiency at the level of technological indicators of the best available technologies in the field of wastewater treatment, approved by the Government of the Russian Federation No. 1430 of September 15 .2020

In the proposed device for wastewater treatment in a single section of the aeration tank, the aeration zone (inside the aeration tank) and the settling zone 6 are combined. The design of the device makes it possible to refuse overflow pipes, valves, airlifts and loading biologically active substances into the device, while maintaining the efficiency of the cleaning process. This increases the reliability of the device, since a smaller number of elements can fail, and also greatly simplifies the maintenance of the device, which is reduced only to periodic (once every one to two years) removal of sediment from the aeration tank.

Technological zones of aeration (inside the air tank) and settling 6 are interconnected by a slot 9, which ensures the flow of the water-silt mixture from one zone to another without the use of additional equipment - airlifts. This solution also makes it possible to ensure the optimal performance of the aerator compressor 10 (in most models on the market, compressors do not provide the necessary performance, since they are forced to work on two systems: airlifts and an aeration system).

The advantages of the claimed invention are:

- design of the bottom of the settling zone 6, preventing the formation of stagnant zones;

- design of the aerator, providing optimal saturation with oxygen, mixing of the water-silt mixture and not provoking resuspension in the settling zone 6;

- design of the settling zone 6, which provides simultaneous settling and natural transportation of the sludge back to the aeration zone (inside the aeration tank).

In the claimed invention, the movement of the water-silt mixture between the zones of aeration and settling is carried out without the use of pumps and airlifts, which ensures optimal compressor performance and the efficiency of the aerator 10, because in most models known from the prior art, compressors provide simultaneous operation of two systems: airlifts and aeration, which has a significant impact on the stability of the process (pressure loss due to the operation of airlifts) leads to a decrease in the intensity of aeration and, as a result, oxygen starvation of activated sludge, decrease in its oxidizing power, deterioration in the quality of cleaning).

Although the embodiment of the claimed invention described above has been set forth for the purpose of illustrating the claimed invention, it will be clear to those skilled in the art that various modifications, additions and substitutions are possible without departing from the scope and spirit of the claimed invention as disclosed in the appended claims.

Claims (13)

1. A device for wastewater treatment, containing a housing 13 with an inspection neck 3, inside which there is a supply pipe 1, which is connected to the aerotank, which is connected to the housing 13 and consists of upper and lower tanks 7 and 12, which are inserted into each other with the formation of a gap 9 between their edges, as well as an overflow tray 4, which is connected to the discharge pipe 5, while the upper container 7 is connected to the inlet pipe 1, an aerator 10 is located inside the lower container 12, and the space between the wall of the upper container 7 and the wall of the housing 13 is a settling zone 6, and - the supply pipe 1 is made with the possibility of supplying wastewater inside - an aerotank, which is designed to accumulate wastewater and purify wastewater from suspended solids, organic contaminants and ammonium nitrogen, using activated sludge accumulating during the operation of the device, and air coming from the aerator 10, - slot 9, under pressure coming from the inlet pipe 1 wastewater, is made with the possibility of passing wastewater from the aerotank into - settling zone 6, which is made with the possibility of wastewater treatment from activated sludge deposited on the walls of the upper tank 7 and then falling through the slot 9 back into the aerotank; - the upper part of the upper container 7 protrudes above the water surface, - overflow tray 4 is made with the possibility of additional purification of wastewater from suspended solids, foam and activated sludge, as well as with the possibility of pouring treated wastewater into - discharge pipe 5, which is designed to discharge treated wastewater to the outside. 2. The device according to claim 1, characterized in that the upper and lower tanks 7 and 12 of the aeration tank are made in the form of upper and lower truncated pyramids, which have no bases, and the lower truncated pyramid is inverted and the upper truncated pyramid is inserted into it with the formation of a slot 9 between the edges of the truncated pyramids. 3. The device according to claim 1 or claim 2, characterized in that the upper container 7 is connected to the housing 13 using fasteners 8. 4. The device according to paragraphs. 1 or 2 and 3, characterized in that the lower container 12 is hermetically connected to the body 13 along the perimeter of the upper and lower base to form a sealed ballast compartment 11 with a filling hole, made with the possibility of filling with water when installing a wastewater treatment device. 5. The device according to claim. 1, characterized in that the overflow tray 4 has an arcuate shape and is located horizontally. 6. The device according to claim 1, characterized in that the aerator 10 is fixed on the bottom of the housing 13.

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