SU1581699A1 - Installation for treating fat-containing waste water - Google Patents

Abstract

The invention relates to the field of purification of fat-containing wastewater, mainly enterprises that produce meat and meat products. Allows to increase the degree of wastewater treatment and to provide a more complete isolation and preservation of nutrients due to the fact that the installation containing a settling tank, flotation units of the first and second stages with pressure tanks and pumps with bypass and pressure pipelines, a unit for treatment of sediment, fat mass and flotation concentrate, equipped with a carbon dioxide generator of the Kipp apparatus type with a gas cleaning filter and a gas pipeline and an aerotank-flotator equipped with a submersible jet air jet after the second-stage flotation cell with a torus, built-in pressure flotation chamber, catchment tray, inclined pipes, purified water removal pipeline and pressure tank, with the lower part of the built-in pressure flotation chamber connected by inclined pipes to the water collection tray, the pressure tanks of the flotators are equipped with carbon dioxide recycle pipelines, bypass and discharge pipelines equipped with ejectors, with ejectors on the bypass pipelines connected to the gas pipeline, and on the discharge pipelines to the carbon dioxide recycling pipelines gas. 1 il.

Description

The invention relates to the treatment of grease-containing sewage, mainly enterprises producing wastewater.

The purpose of the invention is to increase the degree of wastewater treatment and to more completely release and preserve nutrients.

The drawing shows the flow chart of the proposed installation.

The installation includes a pipeline for supplying wastewater 1, a grate 2, a pipeline 3 for supplying treated water to sand traps 4 equipped with sludge washing system 5 and sand pulp pump 6, a settling tank 7 with a pump 8 pumping sludge for treatment, a scraper 9 and a pocket 10 for collecting fat connected to the expansion tank 11 for girosp

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the masses equipped with a steam supply pipeline 12, a pump 13 for pumping the liquid phase and a pipeline 14 for withdrawing concentrate for further processing, a hydrocyclone 15 connected to a sand-catcher 4 through a pump 6 of sand slurry, with Peskov bunker 16 and sludge co-conductor 17, accumulator 18 of sediment with sludge 19 connected to the settling tank 20, equipped with a pipeline 21 for supplying a fugate, a pump 22 pumping sludge, a pocket 23 collecting pop-up substances, a scraper 24, a pump 25 pumping sludge for flotation processing and a pipe 26 The carbon dioxide generator 27 of the Kipp type apparatus 27 with a gas cleaning filter 28 and a gas pipeline 29, a pressure tank 30 with a vortex pump 31, an ejector 32 connected to a gas pipeline 29 installed on the bypass pipeline, and an ejector 33 connected to a carbon dioxide recirculation pipe 34 of a pressure tank 30 connected to the first stage floater 35, equipped with a settling chamber 36, a flotation chamber 37 with a reflector 38 and a gas-liquid solution distributor 39, Eni, camera 41 drainage of purified water, overflow partition 42, catchment tray 43, scraper 44 with a drive 45 scraper mechanism, chute 46 and pipeline 47 flotation concentrate 46 and 47, respectively, as well as a downstream cable 48. Flotation feeder 3.5 of the first stage is connected to perevochny tank 49 for flotation concentrate ,. which is also connected to the flotation unit 50 of the second stage with the pipeline 51 for discharging clarified water, connected by an aero-flotation machine 52, equipped with a jet aerator 53 with an air pipe 54, a flotation chamber 55 with a gas-liquid distributor 56 and overflow holes 57, a catchment tray 58 with inclined pipes 59 and a purified water removal pipe 60, a scraper device 61, a chute 62 and a flotation concentrate pipe 63, a circulating activated sludge pump 64 with a supply pipe 65 and an ejector 66 connected to the pipes sludge wire 67, pressure vessel 68 with a pump 69 connected to

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with the pipeline 54 supplying air through the ejector 70.

The installation works as follows.

Fat-containing industrial waste water through the pipeline 1 enters the grate 2, then through the pipeline 3 is supplied to the sand trap 4,

Here, where it is separated from the sand by the system 5 of the washout and enters the settling basin 7, from which sand is transferred to the settling basin 20. sand traps 4 are pumped by 6 sand pulp into a hydro cyclone 15, where the sediment is separated from the water returned to the head of the structure, and through the sand bin 16 is discharged through the sediment wire 17 and transported by road to a specially equipped platform. From the settling tank 20, the pump 25, the clarified wastewater, is fed to the first stage flotation vessel 35. Part of the water purified on

25, a first stage flotation unit, with a vortex pump 31, is injected into the pressure tank 30. At the same time, carbon dioxide is drawn in via the ejector 32 from the pipeline 29, which is produced in the Kipp apparatus 27 and cleaned in the gas cleaning filter 28. The gas supplied simultaneously with pressurized water dissolves j to form a gas-liquid solution. 35 The carbon dioxide entering the pressure tank 30 is not completely dissolved. A certain amount of it accumulates in the upper part of the tank and is withdrawn from it through a safety valve. For the purpose of economical consumption, this part of the gas is supplied through the carbon dioxide recirculation line 34 to the ejector 33 installed in the discharge pipe 45 of the pump, and thus returns to the pressure tank 30,

The waste water entering the flotation unit at the expense of the reflector 38 moves in a descending-ascending flow in the 5Q flotation chamber 37. Due to slaughter

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To reduce the flow rate and turn, the heavy suspensions continue to move downward and, slipping along the conical bottom of the flotation chamber through an opening in it, enter the settling chamber 36.

The gas-liquid solution under the saturation pressure through a throttling device (not shown) and the gas-liquid solution distributor 39 is injected into the flotation chamber 37, where it is mixed with the treated water. When the solution leaves the throttling device, the smallest gas bubbles are released and the photocomplexes form in the chamber 37 (a pollution particle - a bubble) that float on the surface of the liquid in the AO flotation cell AO and form a flotation concentrate layer.

The clarified water through the chamber 41 of the discharge of purified water and overflow partition 42 through the catchment tray 43 is removed from the first-stage flotation cell and directed to the second-stage flotation cell 50, which is similar to the first-stage flotation cell. Purified insoluble impurities from the second stage flotation unit through the clarified water removal pipeline 51 enters the suction line 65 of the circulation pump 64, which feeds the multi-jet jet aerator 53. This pump has a capacity several times greater than the flow rate of water coming from the flotation cell, and therefore, it takes the main part of the water (with active sludge) from the aerotank-flotator 52.

Due to the vacuum in the cavity of the jet aerator during its operation, air flows through the pipe 54 to the aerator zone. Protein impurities dissolved in wastewater serve as nutrient medium for activated sludge.

Fine-dispersed fatty impurities (not entrained in floaters) are adsorbed by sludge. Sludge water with activated sludge flows through the overflow pipes 57 into the flotation cell 55 of the aero-flotation cell. Here, through the distributor 56 of the gas-liquid-Vo solution from the pressure tank 68, the sediment formed in the chambers for settling flotation units is periodically released into the storage tank 18 of sediments. The sediment from the settling tank 7 and the settling tank accumulator 20 by pumps 8 and 22 is also fed to the accumulators 18, and from there to the processing via the sediment duct 19.

tumbling water solution. Tiny-so-sediment from the sand trap 4 with the help of air bubbles released from the soil 5 and the pump 6 is fed through

from the solution, stuck to the sludge particles, hydrocyclone 15 to the bunker 16. They are collected to the flotation surface, sand in the bunker by road

forming a layer of flotation concentrate. The pumps are transferred to specially equipped water through pipes 59 and catchment areas 55, the tray 58 is diverted to the pipeline. water 60. The inclusion in the installation of the aerotank The flotation concentrate is collected by the scraper-flotator of the described construction,

61 for chute 62, it is good to extract from the clarified in

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which is sent through pipeline 63 for withdrawing the flotation concentrate to a special collection (not shown), and from there to the production of the feed product. Part of the flotation concentrate through the pipeline 67 sludge enters the ejector 66 of the bypass line of the circulation pump to feed the aerotank with active sludge. A part of the water purified in the aerotank floater is supplied to the water-air solution preparation unit, and the remaining part is sent to the city collector via the purified water removal pipeline 60.

The flotation concentrate from the first stage flotation unit (similar to the process in the second stage floater) is assembled into the chute 46 using the scraper 44 with the 45 i drive, from which the flotation concentrate pipe 47 enters the transfer tank 49 for the flotation concentrate, from where it goes to the processing line 14. The presence of special gratings (not shown) on the surface of the water in the flotation units and in the aerotank floater, as well as the low speed of the moving scrapers, ensure the collection of the photoconcentrate of relatively low humidity (no more than 80%), i.e. manufacturability of its transportation and processing is provided.

The fat mass formed on the surface of the water in the settling tanks and sedimentation tanks is collected by means of scraper mechanisms made in the form of self-propelled carriages 9 and 24 into pockets 10 and 23, from there it is sucked into the pereduvochny tank 11 by means of a vacuum pump processing line.

The sediment formed in the flotation cells' settling chambers is periodically released into the accumulator 18. The sediment from the settling tank 7 and the settling tank accumulator 20 by pumps 8 and 22 is also fed to the accumulators 18, and from there to the processing via the sediment duct 19.

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o sediment from sand trap 4 using guide

in water stains and water flotation units, dissolved proteins and finely dispersed fat, and then to obtain: excess sludge a high-quality feedstuff.

The equipment of the proposed installation apparatus Kippa with filter provides stationary production of carbon dioxide. Due to the higher (as compared with atmospheric air) degree of solubility of carbon dioxide in the installation, the flotation of insoluble impurities from the treated water is more intensive and its degree of purification is higher. Since carbon dioxide is an inert gas, the oxidative deterioration of fatty impurities in the process of their extraction from wastewater is prevented. This leads to the production of a more valuable product when disposing of these impurities: not technological grade III fat, but feed grade II.

The effect of wastewater treatment on fat is 80-93%, and on suspended solids - 75-90%. Collecting excess carbon dioxide and returning it to pressure tanks make installation more economical.

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Formula and goiter shadow

A plant for cleaning grease-containing sewage, containing a settling tank-averager, first and second stage flotation units with pressure tanks and pumps with bypass and pressure pipelines, a sludge, fat mass and flotation concentrate treatment unit, which is designed to increase water and more complete release and preservation of nutrients, the installation is equipped with a carbon dioxide generator of the type of the Kipp apparatus with a gas cleaning filter and a gas pipeline and installed after the second-stage flotation cell - a floatator equipped with a submersible jet aerator, an integrated pressure flotation chamber, a catchment tray, inclined pipes, a pipeline for discharging purified water and a pressure tank, the lower part of the built-in pressure flotation chamber connected by inclined pipes to the collection box, the pressure tanks of the flotation cells are equipped with recycle pipes carbon dioxide, bypass and injection pipelines of pumps are equipped with ejectors, and ejectors on bypass pipelines are connected to the gas pipeline, and on discharge pipes conductors - with conduits recycle carbon dioxide tion.

Claims (1)

Formula · Sampling A grease-containing wastewater treatment plant containing an averaging sump, first and second stage flotators with pressure tanks and pumps with bypass and pressure pipelines, a sludge treatment unit, grease and flotation concentrate , characterized in that, in order to increase the degree of wastewater treatment and to more fully isolate and preserve nutrients, the installation is equipped with a carbon dioxide generator such as a Kipp apparatus with a gas purification filter and a gas pipe and installed after the flotator the second stage with an aerotank-flotator equipped with a submersible jet aerator, a built-in pressure flotation chamber, a drainage channel, inclined pipes, a purified water drain pipe and a pressure ζ tank, the lower part of the built-in pressure flotation chamber connected by inclined pipes to the drainage channel, pressure tanks the flotators are equipped with carbon dioxide recirculation pipelines, the bypass and discharge pipelines of the pumps are equipped with ejectors, and the ejectors on the bypass pipelines are connected to. a gas pipeline, and on injection pipelines with carbon dioxide recirculation pipelines.