RU1854U1 - BIOLOGICAL WASTE WATER TREATMENT PLANT - Google Patents

Abstract

PLANT FOR BIOLOGICAL WASTE WATER TREATMENT, comprising a feed pipe for supplying initial wastewater, a rough mechanical treatment unit, a denitrifier, a nitrifying agent, a clarifier with a purified water discharge pipe and an aeration unit, characterized in that the installation is equipped with a flow averager, a circulation pump, an airlift and a distribution grid a pressure regulator and a distribution chamber with a piping for supplying water from the nitrification, drainage of biologically purified water and an external circulation flow, denitrificato made of conical or pyramidal, equipped with a collection pipe in the upper part and combined with a flow averager located above it, the aeration unit is made in the form of an ejector circulation pump installed on the discharge pipe with an air receiver from the atmosphere, the ejector exit is connected to the entrance to the airlift distribution grid, nitrifier equipped with a general circulation flow pipe, the inlet of which is connected to an airlift pressure regulator, and an internal circulation flow pipe, the output of which connected to the airlift inlet, the drainage pipe of the biologically treated water of the distribution chamber is connected to the clarifier, and the external circulation pipe of the distribution chamber is connected to the denitrifier.

Description

Installation for biological wastewater treatment.

The alleged invention relates to installations for the biological treatment of wastewater -, -, containing organic pollutants and nitrogen compounds, in particular, to formations for wastewater treatment in small towns.

In the technology of water treatment, known methods and installations for the simultaneous removal of organic contaminants and nutrients (phosphorus and nitrogenous substances). The most common technology is the use of activated sludge, subjected alternately to the influence of aerobic and anaerobic conditions.

A known installation for biological wastewater treatment, in particular from nitrogen compounds, including pipelines for supplying raw water for treatment and removal of purified water, a denitrification tank connected to a nitrification tank with a circulation channel. The lower parts of the tanks are connected by a channel to which an nitrification tank is connected through an air lift channel through a pipe. The liquid from the denitrification and nitrification tanks that is sucked into the channel enters the nitrification tank. An oxygen-containing gas is supplied to the channel. / Japan Application N 61-52759, C02F 3/30, 1986 /

C02F 3/30

The disadvantages of this installation are the low degree of purification of the source wastewater from organic and suspended contaminants, the use of pneumatic aeration, not reliable enough for installations of small settlements.

A known installation for biological wastewater treatment using ejector aeration with alternating aerobic and anaerobic conditions. / USSR author's certificate N1446115, C02F 3/20, 1987 /

The disadvantage of this installation is the low degree of wastewater treatment, including from gas station compounds.

The increase in the KP of ejectors is limited by the hydrodynamic capabilities of the apparatus in the treatment of untreated wastewater, however, despite the relatively low QCD of water-air ejectors, they are used because of greater reliability compared to pneumatic compressors. It is possible to increase the efficiency of ejector aeration by optimizing the use of ejectors in a number of biological circuits wastewater treatment implemented in technological plants.

A device for biochemical wastewater treatment is known, including a vertical tank, inside which an airlift aerator with an annular conical spillway is coaxially placed, a circulation pump and a water-air ejector, the suction pipe of which is connected to an air cap located above the airlift aerator. / USSR author's certificate N1787139, COEF 3/02, 1991. / The combination of a water-air ejector and airlift aerator installed in the installation allows to increase the productivity of the installation by increasing its oxidizing power.

The closest in technical essence and combination of essential features to the proposed one is the installation for biological purification of water, in particular, from nitrogen compounds, which is a module containing a sedimentation section where purified water is supplied under pressure after passing through a rough mechanical cleaning unit (filter or micro sieve ), the first reactor placed above this section with a stationary stationary loading layer through which the water to be denitrified passes through an upward flow. .Next, water flows over the threshold and, using a sprinkler device, enters the second reactor for microbiological nitrification, here the water loses dissolved nitrogen and is enriched with atmospheric oxygen. The nitrification reactor is filled with a nozzle through which liquid leaks, air is sucked in countercurrent liquid through the nozzle. Under the reactor for nitrification there is a collection tank, which can be filled in the form of a settling chamber (clarification) and has a branch for the release of purified water. / International application N 90/02100, 002F 3/30, 1990 /

The disadvantages of this installation are the low degree of purification from organic and hazardous substances, including due to the low degree of aeration of the nitrification reactor, and significant volumes of denitrification and nitrification reactors.

The technical result obtained from the use of the proposed installation for biological wastewater treatment. consists in increasing the degree of wastewater treatment from

,

-M-.

organic pollutants and nitrogen compounds, reducing reaction volumes and increasing plant productivity while reducing capital costs.

The proposed installation is shown in the drawing.

The installation contains a pipeline for supplying water for cleaning

I, a rough mechanical cleaning unit 2, a denitrifier 3 conical or pyramidal, combined in one housing with a flow averager 4 located above it and equipped with a collection pipe 5 in the upper part, a circulation pump 6, the suction pipe of which is connected to the collection pipe 5, and on the discharge the pipeline of which has a water-air ejector 7 with a receiver of air from the atmosphere 8, airlift 9 with a distribution grid 10 and a pressure regulator

II, the output of the ejector 7 is connected to the input to the distribution grid 10 of the airlift 9, the nitrifier 13 is equipped with a common circulation pipe 12 .. the input of which is connected to the pressure regulator 11 of the airlift 9, and the pipe of the internal circulation stream 15, the output of which is connected to the input of the airlift 9 , a distribution chamber 16 with pipelines for supplying water from the nitrification 14, the drainage of biologically purified water 18 and an external circulation stream 17, and a clarifier 19, to which a pipeline for drainage of biologically purified water is connected 18 and provided with a purified water discharge pipe 20, and an external circulation flow pipe 17 is connected to the denitrifier 3.

Installation works as follows.

cleaning 1 is fed for mechanical cleaning to the rough mechanical cleaning unit 2 (grates, sand traps, etc.), from where it is fed into a conical or pyramidal denitrifier 3, where the sludge mixture also flows through the external circulation pipe 17, and the necessary conditions are created in denitrifier 3 for effective mass transfer between the initial wastewater and a sludge mixture containing nitrogen in the form of nitrates. An excess of oxygen is created in the lower zone and intensive mixing is carried out. As the mixture rises in the denitrifier, the oxygen content decreases and the flow rate decreases. In the upper zone of the denitrifier, the mass transfer conditions are anaerobic. From the upper part of the denitrifier 3 through the collection pipe 5 by a circulation pump 6, the sludge mixture is fed into a water-air ejector 7, into which air from the atmosphere enters through the air receiver 8. The water-air mixture under excess pressure is fed into the distribution grid 10 of the airlift 9, where the sludge mixture is saturated with atmospheric oxygen. When leaving the distribution grid 10, located in the lower part of the airlift 9, air is released into the liquid in the form of bubbles, which creates an airlift effect, under the influence of which the sludge mixture is sucked from the pipeline of the internal circulation flow 15. The total circulation flow of the sludge mixture is discharged through the pressure regulator 11 airlift 9 to nitrifier 13, where aerobic water treatment occurs in the process with activated sludge.

Modification of the nitrification agent can be different: standard azrotenk, liquefied reactor / with i-mobilized

 / ZuoAUbud -hmicroflora, flooded biofilter, etc. In the cleaning process, the use of oxygen introduced into the sludge mixture in the ejector 7 and the airlift chamber 9.

The sludge mixture of the total circulation stream from the nitrification 13 through the water supply pipe from the nitrification 14 is fed into the distribution chamber 16, from where a part of the biologically purified water equal to the inflow of the source wastewater is fed into the clarifier 19 through the drainage pipe of the biologically purified water 18, from where it is purified through the drainage pipe water 20 is removed from the system.

A part of the sludge mixture circulation stream through the external circulation pipe 17 is fed to the denitrifier 3 for displacement with the initial waste water supplied to the treatment.

The use of a combination of an ejector and airlift for aeration of the treated mixture of wastewater and activated sludge can reduce energy consumption by reducing the required pump capacity, increase the use of atmospheric oxygen, thereby intensifying biological processes and increasing the degree of purification of water from organic contaminants and nitrogen compounds, increasing plant productivity, while reducing volumes and lower capital costs.

The amount of air required for the life of microorganisms and replenishment of its entrainment with purified water is regulated by the installation depending on the flow rate and the quality of the wastewater entering the treatment.

(E

- The creation of internal and external sludge recycle can significantly increase mass transfer in: anerobic and aerobic reactors, which can significantly reduce their volume at a given degree of purification.

The authors:

(/

fcf M.N. Orphan of idors A.N. Epov

Claims (1)

PLANT FOR BIOLOGICAL WASTE WATER TREATMENT, comprising a feed pipe for supplying initial wastewater, a rough mechanical treatment unit, a denitrifier, a nitrifying agent, a clarifier with a purified water discharge pipe and an aeration unit, characterized in that the installation is equipped with a flow averager, a circulation pump, an airlift and a distribution grid a pressure regulator and a distribution chamber with a piping for supplying water from the nitrification, drainage of biologically purified water and an external circulation flow, denitrificato made of conical or pyramidal, equipped with a collection pipe in the upper part and combined with a flow averager located above it, the aeration unit is made in the form of an ejector circulation pump installed on the discharge pipe with an air receiver from the atmosphere, the ejector exit is connected to the entrance to the airlift distribution grid, nitrifier equipped with a general circulation flow pipe, the inlet of which is connected to an airlift pressure regulator, and an internal circulation flow pipe, the output of which connected to the airlift inlet, the drainage pipe of the biologically treated water of the distribution chamber is connected to the clarifier, and the external circulation pipe of the distribution chamber is connected to the denitrifier.