SU998381A1 - Apparatus for biological purification of effluents - Google Patents

Description

The invention relates to the biological treatment of municipal and industrial wastewater. A device is known that is a reservoir-With inlet and outlet nozzles. At the bottom of the tank are electrodes for generating oxygen and hydrogen lj.

The disadvantages of the known device are the emission of carbon dioxide in a mixture with hydrogen, which pollutes the environment, and the need for a desilter to separate the microorganisms from the wastewater.

The purpose of the invention is to increase the efficiency of use by increasing the productivity and ensuring the flotation separation of the sludge mixture.

To achieve this goal, a biological wastewater treatment unit consisting of a tank with inlet and outlet nozzles, in the bottom part of which an anode and a cathode are located, connected to a current source, the tank is divided by a partition into aeration and flotation chambers equipped with a bypass window, and the bottom is inclined to the middle and made of.

installed one over the other anode and cathode between which is located. The membrane is permeable with an ion-permeable membrane, the aeration chamber is equipped with an outweighing device, and the flotation chamber is equipped with a collecting chute, which is connected with a pipeline.

This embodiment of the tank

10 lites it into two zones of aeration and flotation, allows to generate oxygen and hydrogen separately, which in turn enables the use of hydrogen to separate microorganisms

15 MOB activated sludge from purified waste water. Thus, in the zone of oxygen generation, biological degradation of wastewater contaminations occurs, in the Generation Zone, about 20 years of age - flotation of hetero-organisms and clarification of the purified vd l.

In addition, the separate generation of oxygen and hydrogen allows

Claims (1)

25 to dispose of gaseous decomposition products (COi) as food (for example, when growing green algae, and hydrogen as a fuel and thereby prevent contamination of the surrounding environment with gaseous products of biological wastewater treatment. Fig. 1 shows the proposed device for biological wastewater treatment, longitudinal section; in Fig. 2 - section A-A in Fig. 1. The device consists of a tank 1, which is divided into aeration chambers 2 and flotation 3 by a partition 4 and is equipped with an inlet 5 and an exhaust nozzle The lower part of the partition is made of the anode 7 and the cathode connected to a current source (not shown in the drawing). An ion-permeable membrane 9 is installed between the anode 7 and the cathode 8. The middle part of the partition is provided with an overflow window 10. inclined to the middle and forms an angle of 30-45 with the bottom 11 of the tank 1, which ensures a uniform distribution of hydrogen bubbles over the entire area of the flotation zone. A mixing device 12 with an agitator 13 is installed in the aeration chamber 2. A collecting chute 14 is installed in the flotation chamber 3. A chute and a stirrer 12 are connected by a pipeline 15 for returning microorganisms from the flotation zone to the aeration zone. Pipe 16 is connected to chute 14 to remove excess activated sludge. The upper part of the tank is sealed and equipped with pipes by wires: 17 and 18, respectively, for the removal of gaseous products of biological decomposition and hydrogen. The device works as follows. Sewage water through the inlet 5 enters the aeration chamber 2, where it is saturated with oxygen generated at the anode 7, and its contamination is oxidized by microorganisms coming from the flotation chamber 3, due to the difference in the levels of the liquid of it and the cavity of the mixing device 12, intensively mixed contents Aeration zones accelerate the dissolution of oxygen and the oxidation of contaminants. The mixture of wastewater and microorganisms in the black: The bypass port 10 enters the flotation chamber 3, where the microorganisms are floated with hydrogen bubbles. generated at the cathode 8. The microorganisms are poured into the collecting chute 14, from where they are returned to the aeration chamber 2 through conduit 15, and their surplus is periodically removed through conduit 16. Purified and clarified water is removed through b. The flotation separation of the sludge mixture increases by 2/3 times the rate of separation of microorganisms of activated sludge from waste water, which allows increasing their concentration 23 times in the aeration chamber 2 and thereby increasing the productivity of the facilities accordingly. In biological treatment of wastewater containing organic pollutants of various degrees of oxidizability, the device is made of two and more: more consistently located steps depending on the oxidizability of the contaminants. Each stage is performed as described. In this case, one or another zid of microorganisms is grown in each step, which preferentially oxidizes a certain type of contamination, which generally has a positive effect on the biological treatment process and contributes to reducing the cleaning time and, consequently, the volume of facilities. The proposed device for the biological treatment of wastewater ensures the use of hydrogen for the flotation of microorganisms that oxidize pollutants, so that it is possible to maintain their high concentration in the aeration zone and thereby increase the productivity of the device by 1.5–2 times, to exclude the use of expensive devices for separation of microorganisms, due to the separate generation of oxygen and hydrogen, utilize the gaseous products of biological oxidation and hydrogen, and prevent contamination of the surrounding. biological treatment products. DETAILED DESCRIPTION OF THE INVENTION A device for biological wastewater treatment, comprising a tank, an inlet and an outlet,; electrodes, distinguished by the fact that, in order to increase the efficiency of use by increasing productivity and providing flotation separation of the sludge mixture, it is sleeping (5 is a vertical, not reaching to the bottom partition with a bypass window dividing the tank into aeration and flotation chambers, a device installed in the aeration chamber by a prefabricated zheloeum placed in the flotation chamber and communicated with a mixing device, and an ion-permeable membrane located between the electrodes, at m latest set obliquely to the bottom of the tank and one-attached. These end to the lower edge of the vertical baffle. Sources of information received note in the examination Patgent 1 1. US 3914164, cl. 204-149, 1976. ./five