SU1063784A2 - Apparatus for purifying effluents - Google Patents

Abstract

DEVICE FOR CLEANING WASTE WATER by bus. St. No. 956438, differing from the fact that, in order to increase the cleaning efficiency by creating optimal conditions for coalescence of petroleum impurities, it is equipped with a dosing pump, the suction pipe of which is connected to the upper part of the settling basin, and the pressure pump is connected to the source water supply pipe.

Description

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The invention relates to the treatment of oily wastewater.

According to the main author. St. No. 956438, a device for wastewater treatment is known, including a hydrocyclone with pipes for supplying raw water and discharging the upper discharge of purified water, a device for distributing waste water, a sewage sump with upper and lower receiving vessels cyclone receiving chambers with non-return to the top of it. The hydrocyclone in the device is installed above the sewage settling basin, while the chambers at the upper and lower discharges are located obliquely to the horizontal and in their upper part are interconnected by means of a slit in the partition. In addition, the device is equipped with adjustable siphons, installed guided siphons, installed on the nozzles of the drainage of purified water and oil products, and a siphon tube through which the lower discharge of the hydrocyclone is connected to the upper part of the adjustable siphon installed on the nozzle of the oil products outlet},

In the known device, the initial wastewater is treated in the field of centrifugal hydrocyclone forces, where the wastewater is preliminarily divided into two streams: the upper drain, enriched with oil products, and the lower discharge, purified from floating oil. Each stream is then settled in a suitable chamber, after which purified water, oil and sludge are removed from the device.

As established by studies, the effect of wastewater treatment in hydrocyclones decreases with an increase in dispersion and a decrease in the concentration of petroleum particles in water, which is typical for treating waste water with emulsified oil, so the number of collisions of oil particles per unit time decreases, and the speed of movement of the liquid in a hydrocyclone limited and insufficient for centrifugation.

The purpose of the invention is to increase the cleaning efficiency and expand the range of applications of the device by creating optimal conditions for the coalescence of petroleum impurities.

The goal is achieved by the fact that the device, including a hydrocyclone, pipes for supplying source water and discharging the top drainage of oil products and the bottom discharge of purified water, a device for distributing waste water, a sewage sump with reception chambers of the top and bottom hydrocyclone dischargers, a vertical partition with slot, siphon, installed on the nozzle of the discharge of purified water and oil products and a siphon tube installed on the nozzle of the outlet of oil products, equipped with a dosing pump, the suction nozzle of which It is connected to the upper part of the settling tank, and the discharge - to the source water supply pipe.

The drawing shows the device, General view.

The device consists of a pipeline 1 supplying the original (polluted) waste water, pressure hydrocyclone 2, connecting pipe 3, distribution} devices 4 lower drain and 5 upper drain, a sump with chambers b receiving the lower drain and 7 upper drain °, connecting vertical nozzle 8 , vertical partition 9, devices 10 for removal of purified water and 11 captured oil, on which adjustable siphons 12 and 13 are mounted. The upper part of the siphon 13 is connected by means of a siphon tube 14 to a connecting pipe 3 "Device GUSTs equipped with devices 15 for erosion and release pellet as well as provided with a metering pump 16, vsasyyayuschy pipe which via a conduit 17 connected to the upper part of the chamber 7 and the discharge conduit 13 to the conduit 1 supplying iskhbdnoy water.

The device works as follows.

Sewage water is polluted with oil (oil field sewage water), through pipeline 1 with a pressure of 2-3 kg / cm is fed into hydrocyclone 2, hydrocyclone 2 pre-separates waste water "under the influence of centrifugal forces artificially created by tangential injection into hydrocyclone, oil is concentrated in its axial part and with a certain amount of passing water is discharged in the form of an upper drain through the branch pipe 8,. With the help of the distributor 5, the upper drain is distributed evenly throughout the settling chamber 7. of purified water in a bottom draining through the connection pipe 3 through the distribution device 4 is supplied to the chamber B of the settler. Under the action of centrifugal or inertial forces, decompose the reservation shells on the oil globules and a hard and frequent collision is achieved and, as a result, they merge into larger droplets. Enlarged droplets intensively float in the sump

Due to the presence of inclination (to the horizontal), the sediment collects oil in its upper part, from the chamber 6 the oil flows into the chamber 7 through the slot in the partition 9 into the chamber 7. Constantly or periodically, as it accumulates, the trapped oil goes through device 11 for further use. The finally purified water is discharged by means of the device 10 for further use. To ensure proper gravity settling, as well as further transportation, the device 10 for draining purified water and 11 captured oil is equipped with adjustable siphons 12 and 13. For redistributing — and balancing the pressures in the system, the connecting nipple is the settling tank. - bellows. The sediment is washed out and discharged by means of device 15. When using the proposed device, the waste water containing emulsified or highly dispersed oil is cleaned with a dosing pump 16, oil from the upper chamber 7 of the settling tank is fed through pipelines 1-7 and 18 to the source water supply pipe 1 . The volume of oil being dosed is determined depending on the concentration and dispersion of oil particles in the source water. The oil entering the pipeline 1 mixes with the original emulsion and provides a developed and firm contact of the small particles of oil contained in the source water with the added oil. This creates favorable conditions for the coalescence of small particles of oil and their absorption during the contact movement in the pipeline 1. This process continues in the hydrocyclone. The hydrocyclone processes the oil-rich emulsion, separates the emulsion into two streams, and feeds them to the respective settler tanks. Studies show that the optimal concentration of oil in the source water is in the range of 20006000 mg / l, i.e. Using a dosing pump, this concentration of oil in the source water must be maintained. The increase in the efficiency of purification of oil-containing water with the use of hydro-cycloning with an artificial increase in the concentration of oil in the original wastewater is theoretically justified and verified experimentally. The application of the proposed device will allow increasing the efficiency of wastewater treatment from oil without attracting additional objects of co-oxidizing oil, as well as expanding the scope of application of hydrocyclones for treating wastewater that contains emulsified or highly dispersed oil.

Claims (1)

DEVICE FOR WASTE WATER TREATMENT by ed. St. No. 956438, characterized in that, in order to increase the cleaning efficiency by creating optimal conditions for coalescence of oil impurities, it is equipped with a metering pump, the suction pipe of which is in communication with the upper part of the sump, and the discharge pipe with a pipe for supplying source water. SLL · .., 10637.84