CN108911123B - Anaerobic purification tank - Google Patents

Abstract

An integrated constructed wetland sewage treatment system relates to the technical field of water treatment and aims to solve the technical problem of improving sewage treatment efficiency. The system comprises an artificial wetland bed, an anaerobic purification tank and a lifting pump; a water distributor is paved above the constructed wetland bed, and a water collector is paved at the bottom of the constructed wetland bed; a three-phase separator is fixed in the anaerobic purification tank, the three-phase separator divides a tank cavity of the anaerobic purification tank into an upper chamber and a lower chamber, a water outlet weir and a slag baffle surrounding the water outlet weir are fixed in the upper chamber, and a sewage inlet and a sludge discharge port are formed in the lower chamber; the water inlet of the lifting pump is connected to the water outlet of the water outlet weir through a pipe fitting, and the water outlet of the lifting pump is connected to the water distributor. The system provided by the application is suitable for sewage treatment.

Description

Anaerobic purification tank

This application is a divisional application of the invention with the application number “201510704399.6” and the invention title “Integrated Constructed Wetland Sewage Treatment System”.

Technical field

The present invention relates to water treatment technology, and in particular to an integrated constructed wetland sewage treatment system technology.

Background technique

As an emerging sewage treatment process, constructed wetlands emerged in Germany, the United States, Denmark and other countries in the 1970s. In our country, due to the large number of small and medium-sized towns, dense population, limited funds and technology, it is very difficult to develop large-scale sewage treatment plants. Therefore, the construction and operation cost is low, the maintenance is simple, and the effect is good. Constructed wetland technology has broad application prospects in our country. .

In the current constructed wetland sewage treatment technology, the removal of pollutants in sewage mainly relies on the main body of the wetland, and the sewage treatment efficiency is often not high. This is because during the wetland design process, the wetland water generally only undergoes simple sedimentation or gridding. Screen slag removal, the concentration of pollutants in the wetland water is too high. Moreover, current constructed wetlands generally require more land than the amount of water they can process. The reason for this is that many constructed wetlands have low hydraulic loads, that is, the amount of sewage that wetlands can process per unit area is low. Moreover, existing constructed wetlands are often prone to clogging during operation. The reasons for clogging include difficulty in controlling the wetland water quality and high concentration of suspended solids, unstable control of the treated water volume, uneven water distribution, and poor water seepage effect of the filling material in the main body of the wetland.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide an integrated artificial wetland sewage treatment system with high sewage treatment efficiency, small footprint, large hydraulic load, stable operation and not easy to be blocked.

In order to solve the above technical problems, the present invention provides an integrated artificial wetland sewage treatment system, which includes an artificial wetland bed for purifying water bodies, and is characterized by: also including an anaerobic purification tank and a lifting pump;

A water distributor for distributing water to the artificial wetland bed is laid flat on the top, and a water collector for collecting water is laid flat on the bottom of the artificial wetland bed;

A three-phase separator is fixed in the anaerobic purification tank. The three-phase separator divides the tank cavity of the anaerobic purification tank into an upper and lower chamber. The upper chamber is fixed with a water outlet weir and a barrier surrounding the water outlet weir. The slag board has a sewage inlet on the wall of the lower chamber and a mud discharge port on the bottom of the lower chamber;

The three-phase separator is composed of a first separation cover and a second separation cover. The first separation cover is an inverted frustum-shaped cover body with upper and lower ends open. The second separation cover is a cone that is open in one direction downward. Body-shaped cover body, the second separation cover is fixed in the first separation cover, the lower edge of the second separation cover is joined with the inner wall of the first separation cover, and a plurality of overflow holes are opened on the lower edge of the second separation cover, each The overflow holes are evenly distributed along the lower edge of the second separation hood, and an exhaust port is provided on the top of the second separation hood. The exhaust port is led to the outside of the anaerobic purification tank through an exhaust pipe;

The slag retaining plate is higher than the three-phase separator, there is a gap between the slag retaining plate and the water outlet weir, and the water inlet of the water outlet weir is higher than the bottom edge of the slag retaining plate;

The water inlet of the lift pump is connected to the water outlet of the water outlet weir through the pipe fitting, and the pump water port of the lift pump is connected to the water distributor.

Further, the top of the anaerobic purification tank is closed by a cover plate, and the artificial wetland bed is installed on the cover plate.

Further, a liquid level switch is installed in the water outlet weir, and the liquid level switch is connected to the start and stop control end of the lift pump.

Further, wetland plants are planted on the artificial wetland bed.

Further, the artificial wetland bed is composed of multiple media layers stacked in sequence from top to bottom. The media layers include an activated carbon particle layer, a ceramsite layer, a plastic filler layer, a fine sand layer, and a gravel sub-layer.

Further, the thickness of the dielectric layer is 15-30 cm.

The integrated constructed wetland sewage treatment system provided by the present invention uses a three-phase separator to perform three-phase separation of sewage. After the sewage is treated by an anaerobic purification tank, the concentration of pollutants in the water is reduced, allowing the constructed wetland bed to process more water in the same time. Large amounts of sewage have the characteristics of high sewage treatment efficiency, large hydraulic load, stable operation and not easy to be blocked; in addition, installing the artificial wetland bed directly on the top of the anaerobic purification tank can also reduce the area occupied.

Description of the drawings

Figure 1 is a schematic structural diagram of an integrated constructed wetland sewage treatment system according to an embodiment of the present invention;

Figure 2 is a top view of the three-phase separator in the integrated constructed wetland sewage treatment system according to the embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. However, these embodiments are not intended to limit the present invention. Any similar structures and similar changes using the present invention should be included in the protection scope of the present invention. The spaces in all indicate the relationship between and.

As shown in Figures 1 and 2, an integrated constructed wetland sewage treatment system provided by an embodiment of the present invention includes a constructed wetland bed 1 for purifying water bodies. It is characterized by: also including an anaerobic purification tank 2, a lifting Pump 6;

A water distributor 7 for distributing water to the artificial wetland bed 1 is laid flat on the top, and a water collector 8 for collecting water is laid flat on the bottom of the artificial wetland bed 1;

A three-phase separator is fixed in the anaerobic purification tank 2. The three-phase separator divides the tank cavity of the anaerobic purification tank into an upper and lower chamber. An outlet weir 4 is fixed in the upper chamber and surrounds the outlet water. The slag retaining plate 5 of the weir 4 is provided with a sewage inlet 21 on the wall of the lower chamber, and a mud discharge port 22 is provided at the bottom of the lower chamber;

The three-phase separator is composed of a first separation cover 31 and a second separation cover 32. The first separation cover 31 is an inverted frustum-shaped cover with open upper and lower ends, and the second separation cover 32 is a downward one-way cover. An open cone-shaped cover, the second separation cover 32 is fixed in the first separation cover 31, the lower edge of the second separation cover 32 is joined with the inner wall of the first separation cover 31, and at the lower edge of the second separation cover 32 A plurality of overflow holes 321 are provided, and each overflow hole 321 is evenly distributed along the lower edge of the second separation cover 32. An exhaust port is provided on the top of the second separation cover 32, and the exhaust port is connected through an exhaust pipe 322. Lead to the outside of the anaerobic purification tank 2;

The slag retaining plate 5 is higher than the three-phase separator, there is a gap between the slag retaining plate 5 and the outlet weir 4, and the water inlet of the outlet weir 4 is higher than the bottom edge of the slag retaining plate 5;

The water inlet of the lift pump 6 is connected to the water outlet of the water outlet weir 4 through pipe fittings, and the pump water port of the lift pump 6 is connected to the water distributor 7 .

In the embodiment of the present invention, the top of the anaerobic purification tank 2 is closed by a cover plate 20, and the artificial wetland bed 1 is installed on the cover plate 20.

In the embodiment of the present invention, the water outlet weir 4 is equipped with a liquid level switch (not shown in the figure), and the liquid level switch is connected to the start and stop control end of the lift pump 6 .

In the embodiment of the present invention, wetland plants 9 are planted on the artificial wetland bed 1. The wetland plants can be selected from canna, hyacinthia, linden seed, yellow iris, calamus, hollywort and other plants. These plants can not only transport oxygen To the root zone, it provides the oxygen demand for the growth, reproduction and degradation of microorganisms in the root zone. It can also maintain and enhance the hydraulic conductivity in the artificial wetland system, and can also significantly remove nitrogen and phosphorus in eutrophic water bodies.

In the embodiment of the present invention, the water distributor 7 is a water pipe with a plurality of water distribution heads uniformly distributed, and the water collector 8 is a water pipe with a plurality of upwardly open water collection ports uniformly distributed.

In the embodiment of the present invention, the artificial wetland bed 1 is composed of multiple media layers stacked in sequence from top to bottom. Each media layer is an activated carbon granular layer, a ceramsite layer, a plastic filler layer, and a fine sand layer from top to bottom. , gravel sub-layer, the thickness of each medium layer is about 15-30cm, activated carbon particles are used to absorb phosphorus in the water, ceramsite is used to strengthen matrix ventilation and accelerate water seepage, plastic fillers are used as biofilm carriers, fine sand, gravel used to fill the bed.

The embodiments of the present invention are suitable for sewage treatment. The specific treatment methods are as follows:

The sewage enters the anaerobic purification tank 2 through the sewage inlet 21 and undergoes precipitation and anaerobic reaction. After precipitation and reaction for a period of time, the three-phase mixture of solid, liquid and gas will rise in the anaerobic purification tank, and the three-phase mixture will rise to the three-phase At the separator, solid, liquid and gas are separated into three phases under the interception of the three-phase separator. Most of the solids are intercepted and gradually settle in the lower chamber of the anaerobic purification tank, and are finally discharged through the mud discharge port 22. Part of the gas accumulates on the top of the second separation cover 32 and is discharged through the exhaust pipe 322 (the exhausted gas is usually rich in biogas and can be used as gas), and the water passes through the various overflows on the lower edge of the second separation cover 32 The hole 321 flows into the upper chamber of the anaerobic purification tank, and then intercepts the slag on the liquid level through the slag baffle 5 and then flows into the outlet weir 4. When the water level in the outlet weir 4 reaches the set value, the liquid in the outlet weir 4 The position switch is closed, thereby controlling the start of the lift pump 6, so that the water in the outlet weir 4 enters the water distributor 7 under the action of the lift pump 6, and is sprayed by the water distributor 7 on the surface of the constructed wetland bed 1, and then in the constructed wetland bed 1 It percolates downward and is purified by the artificial wetland bed during the downward percolation process. The purified water body is collected by the water collector 8 and then discharged; when the water level in the outlet weir 4 is lower than the set value, the water in the outlet weir 4 The liquid level switch is disconnected, thereby controlling the lifting pump 6 to stop running.

Claims (4)

1. An anaerobic purification tank, the pond intracavity of anaerobic purification tank is fixed with the three-phase separator, three-phase separator separates into cavity, lower cavity with the pond chamber, the delivery port is established to the cavity of going up, sewage import has been seted up on the chamber wall of cavity, mud mouth has been seted up on the chamber bottom down, its characterized in that: the three-phase separator consists of a first separation cover and a second separation cover, wherein the first separation cover is an inverted cone-shaped cover body with the upper end and the lower end open, the second separation cover is a cone-shaped cover body with the lower end open unidirectionally, the second separation cover is fixed in the first separation cover, the lower edge of the second separation cover is connected with the inner wall of the first separation cover, a plurality of overflow holes are formed in the lower edge of the second separation cover, the overflow holes are uniformly distributed along the lower edge of the second separation cover, an exhaust port is formed in the top of the second separation cover, and the exhaust port is connected to the outside of the pool cavity through an exhaust pipe.

2. The anaerobic purification tank of claim 1, wherein: an outlet weir is fixed in the upper chamber, and the water outlet is connected to the outside of the pool cavity through the outlet weir.

3. An anaerobic purification tank according to claim 2, wherein: and a slag baffle surrounding the water outlet weir is also arranged in the upper cavity.

4. An anaerobic purification tank according to claim 3, wherein: a gap is formed between the slag baffle and the water outlet weir, and a water inlet of the water outlet weir is higher than the bottom edge of the slag baffle.