SK278057B6 - Method of biological cleaning of waste water and device for realization of this method - Google Patents

Abstract

At cleaning of waste water, mainly with contents of nitrogen matters, are raw waste mixed with one part of activated thickened sludge in anoxic zone and with second part of activated thickened sludge in oxic zone with raised oxidating. In oxic zone with lowered oxidating and in separator is cleaned water separated from activated sludge, which is recurculated into oxic zone with raised oxidating and into anoxic zone in ratio 1:3. Device is created with reservoir (1), with asymetricaly separated wall (2) on activating space (3) and anoxic zone (4). Separator (12) solid connected with wall (2) divides the activating space (3) into oxic zone (8) with raised oxidating and into oxic zone (10) with lowered oxidating.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological waste water treatment process and apparatus for carrying out the process using separated activated concentrated sludge, particularly nitrogen-containing waste water.

BACKGROUND OF THE INVENTION

The currently known method of wastewater treatment by simultaneous removal of organic substances, nitrogen and phosphorus is the subject of MS. PV 00076-90 B. In this process, a functional polyculture of activated sludge is separated from the activation mixture formed in the aerobic zone from partially purified waste water. The waste water is subjected to separate nitrification, then combined with the originally separated functional polyculture, and the mixture is subjected to denitrification in an anoxic reactor and aeration in an oxic reactor. The separated functional polyculture is recirculated back to the anaerobic reactor and the purified waste water is discharged to the recipient.

The process of wastewater treatment is quite lengthy with the need to use anaerobic processes. A functional polyculture with adsorbed colloidal and insoluble organic substances is separated from partially purified wastewater containing dissolved ammonia contamination. The polyculture must pass to the anaerobic reactor after separation.

The hitherto known plant for biological treatment of waste water containing carbon and nitrogenous substances according to MS. of the Protective Document AO no. 228 208 consists of two tanks. In one tank, a separation space is created above the denitrification space and an activation space is created in the other tank. The separation space is separated from the denitrification space by an inclined partition wall and connected to them via a sludge drain.

The disadvantage of such a solution is the use of two tanks, in the case of separate location of each tank associated with a large space requirement.

Another known device for nitrification and denitrification of organic substances in waste water according to the art. of the Protective Document AO no. 248 616 is arranged such that the activation space is divided by a partition into an aerated and non-aerated portion. The compartment partially or completely protrudes above the water surface and creates a slit at the bottom of the tank.

The device is very simple in design, but it is designed without a separation part, without which it is not possible to achieve high-quality wastewater treatment.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are substantially eliminated by a method of biological treatment of waste water using separated activated concentrated sludge, in particular waste waters containing nitrogenous substances under alternating action of anoxic and oxic conditions, and an apparatus for carrying out this method, which consists in in the anoxic zone, with continuous stirring for at least one hour, mix with one part of the activated densified sludge into the primary activating mixture which, under intensive aeration, flows into the oxygenated increased oxygenation zone where it is mixed with the other part of the activated densified sludge from which the purified water is separated from the activated sludge by separation in an oxygenated reduced oxygen zone and a separator. The activated thickened sludge is recirculated to the oxygenated zone with increased oxygenation and to the anoxic zone in a ratio of 1: 3.

It is preferred that the device for carrying out the method consists of a tank which is asymmetrically divided by the wall into an activation space and an anoxic zone. The Anoxic Zone is equipped with a raw wastewater inlet and one activated activated sludge inlet. The activation space is divided by a wall firmly connected to the separator into an oxicone zone with increased oxygenation, which is equipped with a second supply of activated densified sludge and an oxicone zone with reduced oxygenation. An overflow is created in the separator. A through hole is formed in the wall from the side of the oxic zone with increased oxygenation.

The advantages of this method are high performance parameters, with the purification process taking place under normal physical conditions without the use of anaerobic processes. Waste water is directly subjected to denitrification in the presence of thickened sludge separated from the oxic zone and the polyculture passes directly into the anoxic zone, in which the ammonia contamination is immediately degraded. In the absence of an anaerobic zone, the purification process is shortened and energy savings are achieved by grading the oxidation process.

The device has a simple construction with minimal space requirements, in that all waste water treatment stages are situated in a single, purposefully divided space. The flexibility of the plant for the different composition of the wastewater, together with the high intensity of the purification process, meets economically the requirements for the quality of the purified water.

Overview of the figures in the drawing

The invention is explained in more detail by means of a drawing in which the device is shown in a top view.

DETAILED DESCRIPTION OF THE INVENTION

Raw sewage flows into a separate anoxic zone where it is mixed with one part of the activated densified sludge for one hour. Continuous agitation creates a primary activator mixture that flows into the increased oxygenation zone, where it is mixed with a second portion of the activated densified sludge into a secondary activator mixture with vigorous aeration. Purified water is separated from the activated sludge from the secondary activation mixture by separation in the oxygenated reduced oxygenation zone and in the separator, which is recirculated to the oxygenated increased oxygenation zone and into the anoxic zone at a ratio of 1: 3.

The device of FIG. 1 consists of a tank 1 in a plan view of a circular or quadrangular shape, the bottom of which is provided with aeration nozzles (not shown in the figure). The tank 1 is divided by the wall 2 asymmetrically into the activation space 3 and into the anoxic zone 4, which in the upper part is equipped with an inlet 5 of raw waste water and in the lower part with one inlet 2.

Activated thickened sludge 6. The activation space 3 is divided by a wall 2 firmly connected to the separator 12 into an oxygenated oxygenated zone 8 and an oxygenated reduced oxygen zone 10. Oxidized zone 8 with increased oxygenation is provided with a second inlet 9 of activated densified sludge. A triangular prism-shaped separator 12 with an outlet to the sludge duct 14 is provided with a drainage trough 13 for discharging purified water. An overflow 11 is formed in the separator 12. A leakage opening 7 is formed in the wall 2 of the oxic zone 8 with increased oxygenation.

The waste water treatment according to the invention is evident from the figure. Raw effluent flows through the inlet 5 into the anoxic zone 4 and the thickened sludge activated by one inlet 6. With continuous stirring, the raw waste water and the activated thickened sludge form a primary activation mixture which flows through the wall opening 7 of the wall 2 into the oxicoxified zone 8, where it is mixed with the activated thickened sludge supplied by the second inlet 9 to the secondary activation mixture. By spontaneously flowing the secondary activation mixture from the oxo zone 8 with increased oxygenation to the oxo zone 10 with the lower oxygenation, the secondary activation mixture flows through the overflow 11 into the separator 12. The heavier activated sludge directed by the overflow 11 sinks down and purified water flows into the drain. .

The thickened activated sludge is discharged through the sludge through line 14 in which it is discharged in a ratio of 1: 3 to one activated thickened sludge inlet 6, to the activated thickened sludge inlet 9 and to a control valve (not shown). excess sludge is discharged outside the working area.

Industrial usability

The device is widely used in waste water treatment plants. Thanks to its design and cleaning efficiency, it is able to meet the requirements for the quality of purified water, both ecologically and economically.

Claims (2)

PATENT CLAIMS Method for biological treatment of waste water by a multi-stage aerobic process using activated densified sludge, in particular waste water containing nitrogenous substances under alternating action of anoxic and oxic conditions, characterized in that the raw waste water is in the anoxic zone with continuous mixing with delay mixed for at least one hour with one part of the activated densified sludge into the primary activation mixture which, while intensively aerating, flows into the oxic zone with increased oxygenation, where it is mixed with the other part of the activated densified sludge into the secondary activating mixture from which by reduced oxygenation and a separator, it separates the purified water from the activated sludge, which is recirculated to the increased oxygenation zone and to the anoxic zone at a ratio of 1: 3. Device for carrying out the method according to claim 1, comprising a tank on which the aeration nozzles are located, a raw wastewater inlet, a blowdown pipe and a separator with a purified water drainage channel, characterized in that the tank (I) is a a wall (2) asymmetrically divided into an activation space (3) and an anoxic zone (4) equipped with a raw wastewater inlet (5) and one activated densified sludge inlet (6), the activation space (3) being a fixed wall (2) connected to a separator (12) divided into an oxicone zone (8) with increased oxygenation, provided with a second inlet (9) of activated densified sludge, and an oxicone zone (10) with reduced oxygenation, in the separator (12) overflow (11) and wall (2) a through hole (7) is formed from the side of the oxic zone (8) with increased oxygenation.