RU4118U1 - TOWER BIOREACTOR FOR SEWAGE TREATMENT "BIOSOF" - Google Patents

Abstract

A tower bioreactor for wastewater treatment, including a cylindrical body with an expanded upper part, an aeration chamber with an aerator, an annular settler with a degassing chamber, a conical bottom and silt slots, installed in the upper expanded part of the body and communicating with the aeration chamber through the bypass windows, sewage input devices water and drainage of purified water, characterized in that the housing is equipped with a vertical cylindrical partition not reaching the bottom with windows dividing the housing into anaerobic and anoxic chambers, and activated sludge age adjustment scrap, consisting of a tank equipped with a flow separator, a triangular spillway, an excess activated sludge discharge pipe and a return sludge pipe with an overflow pipe, an anaerobic chamber equipped with a biogas drain pipe, and an anoxic chamber with an airlift, whose pipe is connected to the tank of the age adjustment unit activated sludge, the wastewater input device is made in the form of a tank with a triangular spillway and a vertical pipeline, the lower part of which is bent perpendicular brightly cylindrical septum and introduced into the anaerobic chamber, and the device for the removal of purified water - in the form of an annular collector with overflow pipes.

Description

TOWER BIOREACTOR FOR SEWAGE TREATMENT BIOPHOS

The utility model relates to combined devices for wastewater treatment and can be used in various industries for wastewater treatment from organic substances and nutrients - nitrogen and phosphorus.

Methods for the simultaneous removal of organic substances and nutrients (hydrocarbon, phosphorus and nitrogenous substances) are known in the water treatment technology. The most widespread technology is the use of activated sludge, subjected in turn to the influence of aerobic and anaerobic conditions.

When treating wastewater with the simultaneous removal of nitrogenous substances, classic equipment is used in which the processes of aerobic treatment (oxidation of organic compounds and nitrification) and anaerobic denitrification are carried out in separate, separated from each other tanks, and the activated sludge is separated by sedimentation, after which return sludge recycle to the primary processing stage in the water treatment process. These structures occupy large areas, which complicates their use with a shortage of free land.

A device for the biological treatment of wastewater from organic pollution / Copyright certificate of the USSR N 1782942, C02F 3/12, 1990 /. The device is a reservoir divided by vertical partitions into a central aeration chamber and sedimentation chambers. The aeration chamber is equipped with airlift aerator, air distribution grilles, as well as pipes C02F 3/12

WATER supply of wastewater. The settling chambers communicate with the aeration chamber through the transfer windows and the slit chamber. An extensive system of prefabricated trays is provided for collecting purified wastewater.

The combination of nitrification, separation and denitrification zones in one building allows to reduce the area occupied by the construction, however, their size is still significant, in addition, the dephosphation process practically does not occur in the well-known construction, which, in particular, results from the insufficient efficiency of wastewater treatment at this construction.

The closest in technical essence to the proposed one is a tower bioreactor - mine aeration tank with airlift recirculation. / Yakovlev S.V., Skirdov I.V., Shvetsov V.N. and other Biological treatment of industrial wastewater (Processes, devices, structures) M., Stroyizdat, 1985, p.61-63 /. It is a cylindrical vertical tank that can be deepened or mounted on the surface of the earth in the form of a column. The aeration tank in cross section is divided into two parts, in one of which a pneumatic aeration system is provided, and in the other there is an airlift that provides circulation of the sludge mixture and its supply to the aeration part, where the downward movement of the sludge mixture is provided, while air bubbles coming from the aerator, carried away to the bottom of the structure. A prolonged stay of air at elevated pressure determines the efficient use of oxygen. Passing from the aeration part to the airlift, the dissolved air is desorbed from the sludge mixture, which makes it possible to use flotation to separate the sludge mixture.

- 2 A well-known structure occupies substantially small plopeds, however its use does not allow to achieve a high degree of purification from nutrients - nitrogen and phosphorus.

The technical result obtained from the use of the proposed tower bioreactor for wastewater treatment BIOFOS is to improve the quality of treated water for organic substances and nutrients, reduce the amount of excess sludge, reduce the volume of structures, increase the productivity of APP-ATA and expand the range of effective use due to multi-purpose using the reactor and improving mass transfer.

The proposed bioreactor is a combined facility for biological wastewater treatment, combining in one volume the zone of aerobic oxidation and nitrification, denitrification, dephosphation and secondary sedimentation of the sludge mixture.

The drawing shows a tower bioreactor BIOFOS - vertical section.

The device comprises a round-shaped case 1 with an expanded upper part, divided by a vertical cylindrical partition 2 not reaching the bottom into anaerobic 3 and anoxic 4 chambers. Inside the anoxic chamber 4, aeration chamber 5 with an aerator b is coaxially located; in the upper expanded part of the casing there is an annular settler 7 with a conical bottom and silt slots 8, a degassing chamber 9 and bypass windows 10 with gates 11. The device is equipped with an active sludge age adjustment unit consisting of from a tank 12 with a directional partition 13, a triangular spillway 14, an outlet pipe for excess sludge 15 and a return pipe 16 with an overflow pipe 17. In the anoxic chamber 4 there is an airlift 18, pipeline 19 which is connected to the tank 12 node age adjustment of activated sludge. The wastewater input device is made in the form of a tank 20 with a triangular spillway and a vertical pipe 21, the lower part of which is bent perpendicular to the cylindrical partition 2 and inserted into the anaerobic chamber 3, the purified water drainage device is made in the form of an annular collector 22 with overflow pipes. Anaerobic 3 and anoxic 4 chambers communicate through windows 23 with gates in a vertical cylindrical partition 2. To divert the gas formed as a result of bioreactions in the upper part of the anaerobic chamber 3, a biogas discharge pipe 24 is provided.

The bioretor works as follows.

The initial wastewater is pumped into the tank 20 with a triangular spillway, which serves as a flow meter, from which through the pipe 21, tangentially to the cylindrical body 1, it is supplied to the anaerobic chamber 3, where circulating activated sludge also passes through sludge slots 8 from the sump 7 and where due to the increased the formation of organic acids as a result of anaerobic hydrolysis of organic substances, phosphates are released from activated sludge. The anaerobic chamber 3 communicates with the anoxic chamber 4 through the windows 23 in the partition 2. The adjustment of the water flow through the windows 23 is carried out with gates. When air flows through the aerator 6, the upward flow in the aeration chamber 5 creates a downward flow of flows in the degassing chambers 9 of the anaerobic 3 and anoxic 4 and sludge mixture flows from the aeration chamber 5 into the anoxic chamber 4 and the degassing chamber 9 of the settler 7 through the bypass windows 10. Water consumption

- 5

through the windows 10, they are regulated by the shutters 11. In the aeration chamber, an enhanced absorption of phosphates released earlier in the anaerobic chamber by activated sludge with the simultaneous oxidation of organic substances and ammonia nitrogen takes place. In the anoxic chamber 4, previously released phosphates are partially bound by the biomass of activated sludge while reducing nitrates to nitrogen gas and removing organic substances. The sludge mixture from the anoxic chamber 4 by airlift 18 is piped 19 to the tank 12 of the age control unit for activated sludge. The sludge mixture level in the tank is set by moving the overflow pipe 17 on the activated sludge return pipe 16. Excess sludge is removed from the bioreactor through the flow separator 13, the triangular spillway 14 and the excess sludge discharge pipe 15. The amount of phosphorus removed biologically depends on how much it is absorbed by the active biomass, which is daily removed in the form of excess sludge. The stability of the process in the reactor is determined by the need to maintain a constant age of activated sludge throughout the system. In the sump 7, where part of the sludge mixture circulates, the purified water separates from the compacted sludge, which returns through the lower annular opening - sludge slit 8 to the anaerobic chamber 3. The purified water from the sump is collected through overflow pipes in the annular collector 22 and discharged from the bioreactor. The uniformity of the drainage of purified water around the circumference of the reactor is regulated by the movement of overflow pipes on the collector 22. As a result of the ongoing bioreactions, gas is generated that is removed from the bioreactor through the biogas drainage pipe 24.

Thus, the anaerobic, anoxic and aerobic conditions that are successfully combined in the proposed device with variables in space and time contribute to the effective removal of both organic compounds and nutrients — nitrogen and phosphorus — from water. In addition, the CONDITIONS of the technological process in the proposed bioreactor can provide a minimum increase in activated sludge, which will significantly reduce the cost of its further processing and disposal.

Authors: D 1/1/1/1 M.M. Countryman

- 6 E.V. Sokolova

Claims (1)

A tower bioreactor for wastewater treatment, including a cylindrical body with an expanded upper part, an aeration chamber with an aerator, an annular settler with a degassing chamber, a conical bottom and silt slots, installed in the upper expanded part of the body and communicating with the aeration chamber through the bypass windows, sewage input devices water and drainage of purified water, characterized in that the housing is equipped with a vertical cylindrical partition not reaching the bottom with windows separating the housing into anaerobic and anoxic chambers, and activated sludge age adjustment scrap, consisting of a tank equipped with a flow separator, a triangular spillway, an excess activated sludge discharge pipe and a return sludge pipe with an overflow pipe, an anaerobic chamber equipped with a biogas drain pipe, and an anoxic chamber with an airlift, whose pipe is connected to the tank of the age adjustment unit activated sludge, the wastewater input device is made in the form of a tank with a triangular spillway and a vertical pipeline, the lower part of which is bent perpendicular brightly cylindrical septum and introduced into the anaerobic chamber, and the device for the removal of purified water - in the form of an annular collector with overflow pipes.