SU1105475A1 - Installation for purification of waste water - Google Patents

Abstract

INSTALLATION FOR WASTEWATER TREATMENT, comprising a housing divided by cylindrical coaxially arranged partitions into a primary clarifier, an aeration chamber and a secondary clarifier, a rotating truss with aerators, the source wastewater supply units with a central pipe and a drainage of purified water, characterized in that increasing the efficiency of wastewater treatment from emulsified, colloidal and dissolved organic contaminants, fats and suspended particles with a simultaneous increase in the productivity of the installation; It is equipped with two additional cylindrical partitions, the first of which is attached to the bottom of the aeration chamber and installed below the water level, and the second does not reach the bottom of the installation and has an edge bent to its center, about-. between the aeration chamber and the primary clarifier, the clarification chamber with flotation compartments, additional aerators attached to the farm and placed in the flotation compartments of the clarification chambers and between additional partitions, an airlift attached to the farm, placed in the aeration chamber and communicated with the flotation compartments, removal of floating particles attached to the truss and located in the upper part of the chamber (L of the clarification and the primary settling tank, annular, in the shape of a reverse cone, a plate fixed by the central pipe under the bottom of the settler, while the walls of the primary settler are attached to the farm, in the upper parts of these walls, at the level of the scrapers, water distribution windows are made, and in the bottom of the primary settler and the bottom plate below you have 4: 01 holes for sediment removal.

Description

The invention relates to combined compact installations designed for the complete biochemical treatment of small amounts of wastewater containing hardly oxidizable emulsified, colloidal and dissolved organic impurities, suspended particles, fats, and can be applied to the treatment of domestic wastewater and effluent water. food industry (co-processing plants, dairy plants, fish factories, etc.). A well-known combined compactor installation, including a primary settling tank and concentrically located aeration tank and secondary settling tank, as well as an accumulator and aerobic mineralizer of excess activated sludge C 1 1 However, this installation is characterized by insufficient efficiency in the treatment of concentrated industrial wastewater containing non-coherently difficult to remove contaminants. This is due to the lack of efficiency of wastewater treatment in the primary clarifier. Due to these, in order to achieve the desired effect of wastewater treatment, it is necessary to increase the capacity of its treatment in the aeration tank, which reduces the performance of the facility as a whole. In addition, the significant amount of floating particles in industrial wastewater leads to the formation of a crust on the water surface of the primary clarifier, and the lack of mechanisms for periodic removal significantly complicates the operation of the installation. The aim of the invention is to increase the efficiency of wastewater treatment from emulsified, colloidal and dissolved organic pollutants, fats and suspended particles with a simultaneous increase in the production rate of the installation. This goal is achieved by installing a casing divided by cylindrical coaxially arranged partitions onto a primary settling tank, an aeration chamber and a secondary settling tank, a rotary truss with aerators, supply lines for the original wastewater with a central pipe and drainage of purified water are equipped with an additional cylindrical | Coy a partition attached to the bottom of the aeration chamber and installed below the liquid level, and a second partition located along it, which does not reach the bottom of the installation and The edge bent to its center, forming between the aeration chamber and the primary settling tank a brightening chamber with flotation compartments, additional aerators attached to the truss and placed in the flotation compartments of the brightening chambers and between the additional partitions, an airlift installed in the aeration chamber communicated with the flotation compartments and attached to the farm, scrapers to remove floating particles, attached to the farm and placed in the upper part of the clarification chamber and the primary settling tank, annular, in the form of the reverse a cone, a plate fixed under the bottom of the primary clarifier on the central tube, while the walls of the primary clarifier are connected to the farm, where there are water distribution windows at the level of the scraper, holes in the bottom of the primary clarifier and underneath the plate to remove the sediment. FIG. 1 shows the proposed installation, top view; in fig. 2 the same, longitudinal section; in fig. 3 is a section A-A in FIG. 2. The installation contains a primary clarifier 1, flotation compartments 2 in the clarification chamber 3. The flotation compartments 2 and the chamber 3 are separated from the aeration chamber 4 by partitions 5 and 6. The secondary settling tank 7 is separated from the aeration chamber 4 by partitions 8 and 9. The wastewater is supplied to the installation through a pipeline 10. The purified water is collected by means of a peripheral tray 11, and its withdrawal from the installation by means of pipeline 12. Air is supplied to the flotation compartments 2 through aerators 13 mounted on the rotating farm 14 from the compressor 15 installed on the farm. Air is supplied to aeration chamber 4 through aerators 16 from compressor 15. Removal of floating particles. the surface of the sump 1 is carried out using scrapers 17. Sewage water from the sump 1 is fed into the flotation compartments 2 through the water distribution windows 18. Removing the foam from the surface

the flotation compartments 2 is carried out using scrapers 19 into collecting trays 20. Foam removal from trays 20 is carried out via pipeline 21. Sludge is deposited from the settling tank 1 through windows 22, which are made in the bottom 23 of the settling tank 1 and the plate 4. A sludge bunker 25 is provided for sludge removal. The sludge from bunker 25 is removed by conduit 26, and excess activated sludge is removed from the aeration chamber 4 to the flotation compartment by the 2nd using airlift 27 fixedly mounted on a rotating farm 14. supplying the waste water from the clarification chamber 3 in the aeration chamber A between the radial walls 5 and 6 is provided on a farm 14 mounted aerator 28 in the form of a perforated pipe.

The installation works as follows.

The original wastewater through conduit 10 is supplied to sump 1, where it is settled. The clarified water passes through the distribution windows 18 into the flotation compartments 2 directly onto the foam layer, where it is floated with bubbles of air supplied from compressor 15 through aerators 13, which are cassettes of perforated rubber tubes. The sediment from the settling tank 1 is removed in the lower conical part of it through the windows 22, which periodically open when the truss rotates 14. The removal of floating particles from the surface of the liquid in the settling tank 1 into the flotation compartments 2 through the water distribution ports 18 is fixed on the farm 14; The foam formed in the flotation compartments 2 is scraped by means of scrapers 19 fixed on the rotating farm 14 and collected in collecting trays 20 fixed on the partition 5. Discharge from the trays 20 is carried out via a pipeline 21 connecting the trays and adjacent to the partition 5. Sewage water , cleaned in the flotation compartments 2 is subjected to additional clarification in the zone of chamber 3. The sediment formed in chamber 3 and the sediment discharged from the sump 1 are collected in a collection bin 25, from where they are periodically removed through conduit 26. Clarified water from the chamber 3 hours Through a slit formed by partitions 5 and 6, it enters the aeration chamber 4, where it is aerated, mixed with activated sludge. As a result of the air-lift effect exerted by the aerator 28 when air is supplied through it, the wastewater from chamber 3 is continuously supplied to the aeration chamber 4 and the sludge mixture from chamber 4 is prevented from entering chamber 3. The silt mixture from the aeration chamber 4 is prevented through the slit formed by partitions 8 and 9 enters the secondary settling tank 7, where it is settled. Clarified in the secondary clarifier 7, the water enters the collection

Tray 1 1 and pipeline 1 2 OTVO-.

Dits from the installation. The active sludge from the secondary clarifier 7 is returned to the aeration zone through a slot in the bottom part. Blow-up active sludge from the aeration zone is removed by means of airlift 27 to the flotation compartment 2, where it is mixed with wastewater from the water distribution windows 18.

The use of the proposed plant for the purification of concentrated fat-containing wastewater from food industry enterprises allows an increase in the efficiency of purification by MIC.

to 98.5%, for suspended substances up to 94%, for fats up to 100%. In addition, the application of the proposed plant allows reducing the cost of pre-treatment of wastewater before supplying it to the plant, which simplifies the operation of the plant.

f / anpaS / 7e tfe / ilk //// farms

fi €, 1

fS ago fi IS 17

tf

G7

-cTr ff i-yVVyi

777 /

17 19 a

/ ff v fffff

Iff

Claims (1)

SEWAGE TREATMENT PLANT, comprising a housing divided by coaxially arranged cylindrical baffles into a primary settling tank, an aeration chamber and a secondary settling tank, a rotating farm with aerators, feed wastewater supply units with a central pipe and purified water discharge, characterized in that, in order to increase the efficiency of wastewater treatment from emulsified, colloidal and dissolved organic pollutants, fats and suspended particles while increasing the productivity of the installation, it is equipped with It is equipped with two additional cylindrical partitions, the first of which is attached to the bottom of the aeration chamber and is installed below the water level, and the second does not reach the bottom of the installation and has an edge bent to its center, ob-. between the aeration chamber and the primary settler, the clarification chamber with flotation compartments, additional aerators attached to the farm and located in the flotation compartments of the clarification chambers and between additional partitions, an airlift attached to the farm, placed in the aeration chamber and communicated with the flotation compartments, scrapers for removal of floating particles attached to the farm and located in the upper part of the clarification chamber and the primary settler, annular, in the form of a cone inverse, with a plate fixed to a central pipe under the bottom of the sump, while the walls of the primary sump are attached to the truss, water distribution windows are made in the upper parts of these walls, at the level of the scrapers, and holes for removing sludge are made in the bottom of the primary sump and underneath it ·