CN114940528A - Sewage emission reduction device based on gravity type oil-water separation process - Google Patents

Abstract

The invention discloses a sewage emission reduction device based on a gravity type oil-water separation process, wherein an oil separation tank is divided into an oil-rich tank and a lean oil tank by a partition plate vertically arranged in the middle of the oil separation tank, and a lean oil water channel is arranged at the bottom of the partition plate; the device also comprises a lifting pool and an oil-water separator; an oil suction pump is arranged at the upper end part of the oil-rich pool and is connected to the oil-water separator through a valve I pipeline; the upper end part of the lean oil pool is connected with the lifting pool through an overflow pipe, a lifting pump is arranged in the lifting pool, and the lean oil pool further comprises a radar liquid level meter matched with the lifting pool; a glass plate liquid level meter is arranged in the oil-water separator, an oil discharge pipeline is arranged at the upper end of the oil-water separator through a valve II, and a lower end part backflow valve pipeline is connected to the oil enrichment pool. The device can perform oil slick enrichment and oil-water separation on the oily sewage, has high automation degree, saves manpower and material resources, and is simple, convenient and safe to operate.

Description

Sewage emission reduction device based on gravity type oil-water separation process

Technical Field

The invention relates to a chemical sewage treatment device, in particular to an oily sewage emission reduction device.

Background

Oily sewage enters a grid pool, an oil separation pool and a lifting pool of a sewage station from a production device, most of floating oil is stored on the water surface of the oil separation pool and is more and more increased along with the time, if the oily sewage is not treated in time, the oily sewage enters a subsequent sewage treatment system and may contact with active mud of an oxidation pool to form oil poisoning, on one hand, the treatment capacity of the sewage station is reduced, and on the other hand, because high-volatile substances may exist in the floating oil, fire and explosion are easy to cause, so that certain potential safety hazards exist. In order to reduce the entering of the floating oil into the sewage treatment system, the measures adopted at the present stage are to salvage the floating oil in the oil separation tank manually, which wastes time and labor, has low efficiency and has certain safety risk.

Disclosure of Invention

The invention aims to provide a sewage emission reduction device based on a gravity type oil-water separation process, which can perform floating oil enrichment and oil-water separation on oily sewage, has high automation degree, saves manpower and material resources, and is simple, convenient and safe to operate.

In order to solve the technical problem, the sewage emission reduction device based on the gravity type oil-water separation process comprises an oil separation tank, wherein the oil separation tank is divided into an oil-rich tank and an oil-poor tank by a partition plate vertically arranged in the middle of the oil separation tank, and an oil-poor water channel is arranged at the bottom of the partition plate; the device also comprises a lifting pool and an oil-water separator;

an oil suction pump is arranged at the upper end part of the oil-rich pool and is connected to the oil-water separator through a valve I pipeline; the upper end part of the lean oil pool is connected with the lifting pool through an overflow pipe, a lifting pump is arranged in the lifting pool, and the lean oil pool further comprises a radar liquid level meter matched with the lifting pool;

a glass plate liquid level meter is arranged in the oil-water separator, an oil discharge pipeline is arranged at the upper end of the oil-water separator through a valve II, and a lower end part backflow valve pipeline is connected to the oil enrichment pool.

The lean oil water channel comprises a plurality of gaps arranged at the lower ends of the partition plates, baffle plates are arranged in the gaps through pin shafts, and the pin shafts are arranged above the central lines of the baffle plates.

The technical advantages of the invention are embodied in that: A. the device firstly concentrates floating oil and then separates the floating oil by the oil-water separator, thereby achieving the effects of energy conservation and emission reduction. B. Oil-water stratification is formed in the rich oil pool by utilizing the specific gravity difference of oil and water, the poor oil water enters the poor oil pool from the lower end of the rich oil pool, and the floating oil is enriched at the upper end of the rich oil pool, so that the working efficiency of the oil-water separator is improved. C. In the working process, an operator only needs to observe the state of the oil-water separator regularly, the liquid level of the oil separation tank is automatically controlled by the system, the automation degree is high, manpower and material resources are saved, and the operation is simple, convenient and safe.

Drawings

FIG. 1 is a schematic structural diagram of the first embodiment;

fig. 2 is a schematic structural diagram of the second embodiment.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

The main working principle of the device is that the oil and water have a specific gravity difference, the specific gravity of the oil is smaller than that of the water, an oil-water mixture is in a container, a layering phenomenon occurs, and the oil floats on the water; at this time, water can be discharged from the channel below the floating oil layer, and the floating oil is still retained in the original container to realize enrichment.

Example one

As shown in fig. 1, the sewage emission reduction device based on the gravity type oil-water separation process of the present embodiment includes an oil separation tank, the oil separation tank is divided into an oil-rich tank 11 and an oil-poor tank 12 by a partition plate 10 vertically disposed in the middle of the oil separation tank, and the bottom of the partition plate 10 is provided with an oil-poor water channel; the device also comprises a lifting pool 2 and an oil-water separator 3;

an oil suction pump 13 is arranged at the upper end of the oil enrichment pool 11, and the oil suction pump 13 is connected to the oil-water separator 3 through a valve I40 pipeline; the upper end part of the lean oil pool 12 is connected with the lifting pool 2 through an overflow pipe, a lifting pump 20 is arranged in the lifting pool 2, and the lean oil pool further comprises a radar liquid level meter 21 matched with the lifting pool 2;

a glass plate liquid level meter 30 is arranged in the oil-water separator 3, an oil discharge pipeline is arranged at the upper end part of the oil-water separator 3 through a valve II41, and a return valve 42 at the lower end part is connected to the oil-rich pool 11 through a pipeline.

In this embodiment, the lower edge of the partition plate 10 is higher than the bottom plate of the oil separation tank, that is, the rich oil tank 11 and the lean oil tank 12 are completely penetrated through the lower edge of the partition plate 10.

The working process is as follows:

oily sewage enters an oil separation tank from a device, the oil separation tank is composed of two tanks, the middle of the oil separation tank is separated by a partition plate 10, the sewage enters an oil-rich tank 11 through a pipeline, and floating oil is formed on the surface of the oil-rich tank 11 and is enriched and intercepted by the partition plate 10 because oil is lighter than water; and the lower end lean sewage enters the lean oil pool 12 through the lean oil water channel. In the process, oil and water are separated by gravity, and preliminary separation of the oil-rich sewage and the oil-poor sewage is realized.

When the liquid level in the oil-rich pool 11 rises and the oil stain on the surface grows more, the oil suction pump 13 is started at the moment, the floating oil is pumped to the oil-water separator 3 through the valve I40, the oil-water mixture pumped at the moment contains more oil and still contains part of water, then the liquid level of the oil-water separator is adjusted to the middle position of the glass liquid level meter 30 and is stable through the cooperation of the valve I40 and the valve III42, the oil-water separation condition in the glass liquid level meter 30 is observed regularly, and when the preset range is reached, the valve II41 is started to discharge the floating oil and recycle the floating oil to the oil-stain tank.

In order to realize the functions, a lifting pump 20 is arranged in the lifting pool 2, and the device also comprises a radar liquid level meter 21 matched with the lifting pool 2; the control device remotely controls the start and stop of the lifting pump 20 through the reading of the radar liquid level meter 21, so that the liquid level of the oil separation tank is always at the height of the overflow port, the oil suction pump 13 is at a proper height, and the optimal working state is kept.

In the operation process of the device, only personnel are required to be arranged for regular inspection, and the valve II41 is controlled to discharge oil according to the feedback of the glass liquid level meter 30. The safety risk during manual operation is greatly reduced, the oil absorption pump 13 works for a long time to ensure that a sewage follow-up system cannot carry oil, the working condition of the contact oxidation pond active sludge is good, the sewage treatment effect reaches the optimal state, the environmental protection requirement is ensured, and the energy conservation and emission reduction are realized.

Example two

In the first embodiment, the rich pool 11 and the lean pool 12 are completely penetrated through the lower edge of the partition plate 10, and the region below the lower edge of the partition plate 10 forms a lean water passage. When the liquid level of the rich oil pool 11 is higher than the elevation of the lean oil water channel, the lean oil water channel can prevent the floating oil layer of the rich oil pool 11 from passing through; when the liquid level of the oil-rich pool 11 is low, the floating oil and the sewage simultaneously pass through, and the oil-water separation effect is not ideal. This phenomenon occurs both when the production load of an enterprise is low or during the initial filling of the oil separation tank.

As can be seen from fig. 2, in order to solve the above problem, in this embodiment, the bottom of the partition 10 is flush with the bottom of the oil separator, and the rich oil pool 11 and the lean oil pool 12 are completely partitioned by the partition 10. The lean oil water channel comprises a plurality of gaps arranged at the lower end of the partition plate 10, a baffle 14 is arranged in each gap through a pin shaft, and the pin shafts are arranged above the central line of the baffle 14.

Since the baffle 14 is heavy at the bottom and light at the top, and the pressure is small, the baffle 14 is arranged vertically around the pin shaft, and the lean water passage is closed. When the oily sewage enters the oil-rich pool 11, if the liquid level is low, the pressure on the baffle plate 14 is small, and the closed state of the oil-poor water channel is continuously kept. Along with the liquid level of the rich oil pool 11 rising, the rich oil layer correspondingly rises. When the liquid level reaches the critical height, the baffle 14 is opened by water pressure, and at the moment, sewage in the oil-rich pool 11 enters the oil-poor pool 12 through an oil-poor water channel at the lower layer; because the liquid level of the rich oil pool 11 is firstly raised to a designated position, and then the lean oil water channel at the lower end is opened, the floating oil amount entering the lean oil pool 12 can be reduced at the liquid level raising stage of the rich oil pool 11, and the oil-water separation effect is further improved.

The embodiments of the present invention include, but are not limited to, the above-mentioned embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the substance of the present invention, and still fall into the scope of the present invention.

Claims (2)

1. The utility model provides a sewage emission reduction device based on gravity type oil-water separation technology, includes oil interceptor, its characterized in that: the oil separation tank is divided into an oil-rich tank (11) and a lean oil tank (12) by a partition plate (10) vertically arranged in the middle of the oil separation tank, and a lean oil water channel is arranged at the bottom of the partition plate (10); the device also comprises a lifting pool (2) and an oil-water separator (3);

an oil suction pump (13) is arranged at the upper end of the oil-rich pool (11), and the oil suction pump (13) is connected to the oil-water separator (3) through a valve I (40) pipeline; the upper end part of the lean oil pool (12) is connected with the lifting pool (2) through an overflow pipe, a lifting pump (20) is arranged in the lifting pool (2), and the lean oil pool further comprises a radar liquid level meter (21) matched with the lifting pool (2);

a glass plate liquid level meter (30) is arranged in the oil-water separator (3), an oil discharge pipeline is arranged at the upper end part of the oil-water separator (3) through a valve II (41), and a lower end part return valve (42) is connected to the oil-rich pool (11) through a pipeline.

2. The gravity type oil-water separation process-based sewage emission reduction device of claim 1, wherein: the lean oil water channel comprises a plurality of gaps arranged at the lower end of the partition plate (10), a baffle (14) is arranged in each gap through a pin shaft, and the pin shafts are arranged above the central line of the baffle (14).

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