SU981250A1 - Apparatus for biochemical purification of effluents - Google Patents

Description

(S) INSTALLATION FOR BIOCHEMICAL CLEANING

one

The invention relates to combined compact installations intended for complete biochemical treatment of wastewater containing emulsified fats, dissolved and colloidal organic contaminants, suspended substances, and can be applied to purify highly concentrated wastewater from food processing enterprises (mills, milk farms, fish factories), as well as for the treatment of household sewage coming from separate facilities (campgrounds, rest houses, etc.) and small populated nktov fs

For the biochemical treatment of small amounts of wastewater, compact installations of the Mini-block type are widely used, including an aeration tank, a second sediment bowl, an aerobic mineralizer of excess Active sludge, and also Menzel-type installations, including a two-stage sedimentation tank, an aerosol. WASTEWATER

tenk, secondary clarifier, underground pumping station WITH

The use of such plants for the purification of highly concentrated fat-containing wastewater from the food industry is inefficient, since a large part of the hardly acidified fats and dissolved organic pollutants entering the installation with the wastewater remain unrecovered from the wastewater during the calculated aeration period. This is due to the fact that animal fats and milk fats, as well as some of the organic pollutants, are not acidic. For their complete oxidation, aeration water together with activated sludge, followed by settling in secondary settling tanks, is insufficient. As a result, the quality of the treated wastewater is reduced.

Closest to the proposed invention is the compact installation of the Bayok-2 installation, which is used to treat small amounts of wastewater. The installation is a circular tank with a central location of the settling zone. The peripheral aeration zone is divided into three sectors: the aeration tank itself, the activated sludge regenerator and the aerobic mineralizer of excess activated sludge 2. The use of a known plant for cleaning highly concentrated fat-containing wastewater from food industry enterprises is inefficient. This is due to the short period of aeration of wastewater in a mixture with activated sludge in the air tank itself (1 h) and a short period of regeneration of activated sludge (6-9 h), as a result, fatty and organic substances do not completely oxidize, they accumulate in activated sludge, which subsequently entails a decline in the quality of the purified liquid. The aim of the invention is to increase the efficiency of use of the plant by ensuring complete oxidation of fat and organic substances. This goal is achieved by that a plant for biological wastewater treatment, comprising a housing divided by a coaxial partition into an aeration tank and a centrally located secondary sedimentation tank, an activated sludge regenerator, is provided with a primary aeration chamber of waste water located at the center of the installation, a degassing and flow stabilization chamber located concentrically relative but the primary aeration chamber of waste water, a tertiary settling tank, connected to an aeration tank, a final settling tank, connected to a tertiary settling tank and an aero tank, and Aeration tank, secondary sedimentation tank and regenerator of activated sludge are also installed centrally in the chamber of primary aeration of waste water after the degassing chamber and the flow stabilization. FIG. 1 shows an installation in longitudinal section; in fig. 2 - the same in terms of. The installation includes a supply pipe 1 of the original waste water, a pipe 2 for discharging treated waste water, and a primary aeration chamber 3 for waste water. The aeration of the waste water in the installation is carried out through per 5 ори 4 forged pipes. Air is supplied by compressors located above the ceiling in the soundproof cabinet 5. Chamber 6 is used for degassing the sludge mixture and stabilizing the flow. Secondary sump 7 is used for settling the sludge mixture after primary aeration chamber 3 7, a sludge discharge window 8 is provided, protected from the entry of air bubbles by a protective cone 9 and adjustable by a valve 10. The adjusting window 8 is adjusted by a threaded rod 11. In addition, the installation includes aeration tank 12, tertiary sump 13t regenerator of activated sludge I, final sump 15. In the primary aeration chamber 3 of waste water and aero tank 12 perforated pipes k are laid along the bottom. In the activated sludge regenerator 1, perforated pipes k are laid along the perimeter of the pyramidal bottom at three different levels, which ensures aeration of the entire volume of the regenerator. The silt mixture in the tertiary settling tank 13 is distributed using a distribution chute 16, to collect wastewater clarified in the tertiary clarifier, a collection tray 17 is provided. The system is supplied with an airlift 18 to feed the activated sludge from the sedimentary zone 13 of the tertiary settling tank. water from the tertiary sump 13 to the final sump 15 serves as a pipe 19. The distribution of water in the final sump "15" is carried out using a distribution chute 20, to collect finally clarified water serves as a collection tray 21. To remove excess activated sludge from the settling zone of the tertiary sump 13 and the final 15, the installation is equipped with a discharge pipe 22. To drain the clarified in the secondary sump 7 and distribute it in the aeration tank, the distribution tray of the regenerated activated sludge from the the regenerator 14 in the aero tank 12 is the airlift 2C. To change the direction of flow of the sludge mixture in the secondary settling tank 7, a reflective cone 25 is provided. The device operates as follows.

The original wastewater through pipeline 1 is fed into the primary aeration chamber 3 of the waste water, where it is aerated in a mixture with active sludge, supplied by the airlift 18 from the tertiary sump 13. The mixture from the nei aeration chamber 3 enters the degassing chamber and stabilizes the flow 6, where air bubbles are separated, and the silt mixture acquires a downward direction of movement and enters the settling zone of the secondary clarifier 7. Reflected from the cone 25, the flow of liquid changes direction and moves upwards. The activated sludge under the influence of the force of gravity is deposited and through the transmission window 8 enters the regenerator of activated sludge 1A for regeneration. The flow of circulating sludge through the window 8 is controlled by means of a valve 10 mounted on a threaded rod 11 moving in a vertical direction. The protective cone 9 prevents air bubbles from entering the settling zone of the secondary settling tank 7. The waste water clarified in the secondary settling tank 7 is distributed to the aeration tank 12 by means of a distribution tray 23. In the aeration tank 12, the waste water is aerated in a mixture with active sludge supplied by airlift 2 from the active regenerator sludge 1. The mixture from the aerotank enters the distribution tray 16 of the tertiary clarifier 13; activated sludge from the settling zone of the tertiary clarifier 13 is fed into the primary aeration chamber 3 of the waste water airlift 18. The sewage clarified in the tertiary clarifier 13 enters the collection tray 17 and is discharged via conduit 19 into the distributing tray 20 of the final clarifier 15 for final clarification. The water finally clarified in the final sedimentation tank 15 enters the collection tray 21 and is discharged through line 2 from the installation. Excess activated sludge from the settling zone of the tertiary clarifier 13 and the final settler 15 is discharged through the pipeline 22 within the installation limits. Aeration of waste water in the installation is carried out through perforated pipes 4 with the help of compressors installed above the ceiling of the installation in cabinet B.

The use of the proposed plant for the purification of highly concentrated fat-containing wastewater of enterprises of the food industry makes it possible to increase the efficiency of wastewater treatment in accordance with BODg - 93% in suspended substances.- 91.

Claims (2)

1. Karelin Ya.A. and others. Wastewater treatment plants in Western Europe. M. Stroyizdat, 1977i p. 62. 2. In the same place 68