CN205099548U - A section + A2O sewage treatment system - Google Patents

Abstract

The utility model relates to the technical field of sewage treatment, and specifically discloses a section A + A ² O sewage treatment system. The A section + A ² O sewage treatment system includes a pretreatment device, A section aeration tank, advection sedimentation tank, A ² O biochemical device, advanced treatment device; the pretreatment device, A section aeration tank, advection sedimentation tank The pool, the ^A2O biochemical device, and the advanced treatment device are connected in sequence. The utility model transforms the conventional hydrolysis acidification tank into the A-section aeration tank, realizes efficient adsorption and flocculation of pollutants in the sewage through the A-section aeration tank, removes most of the refractory organic matter, and utilizes the A ² O biochemical device to The sewage is further treated biologically to remove most of the pollutants, and then treated by an advanced treatment device, and finally the effluent discharge reaches the GB18918-2002 Class A standard.

Description

Section A + A2O sewage treatment system

technical field

The utility model relates to the technical field of sewage treatment, in particular to a section A + A ² O sewage treatment system.

Background technique

With the rapid development of my country's economy in recent years, various industrial and mining enterprises have discharged more and more industrial wastewater/sewage. After the sewage discharged by upstream enterprises enters the pipe network, it will have a greater impact on downstream urban sewage treatment plants, especially in high-grade waste water. The concentration of refractory biodegradable substances reduces the biodegradability of wastewater, and it also causes great difficulties for the sewage treatment of urban sewage treatment plants.

For the treatment of this type of sewage, after long-term practice, the following two treatment methods have been formed: (1) by adding easily biodegradable organic matter, such as glucose, sodium acetate, etc., to the sewage to improve the biodegradability of the sewage; ( 2) Before the sewage enters the biological reaction tank, the biodegradability of the sewage is improved through hydrolytic acidification, ozone, Fenton oxidation and other processes. However, because the sewage treatment cost of municipal water is usually relatively low, therefore, due to cost considerations, as a means of improving biodegradability, including treatment processes such as adding carbon sources and Fenton oxidation, etc., are usually not used in municipal sewage treatment. Therefore, in the existing technology, the hydrolytic acidification tank is usually used as the pretreatment before the biological treatment.

However, hydrolytic acidification tanks are generally suitable for situations with high COD (generally greater than or equal to 2000mg/L). Therefore, when the influent COD is low (less than 300mg/L), the treatment effect of the hydrolytic acidification tank is not ideal, and it is difficult to cultivate a stable biological system through the hydrolytic acidification tank. To the due effect, and even have a negative effect on the follow-up processing.

In order to improve the ability of urban sewage treatment plants to remove refractory substances, it is necessary to transform the hydrolytic acidification tank into a sewage treatment system suitable for low COD.

Utility model content

The embodiment of the utility model provides a section A + A ² O sewage treatment system, aiming to solve the problems of poor treatment effect of the hydrolysis and acidification pool caused by low COD content of sewage in the existing process of hydrolysis and acidification treatment of sewage.

In order to achieve the purpose of the above-mentioned utility model, the technical scheme that the utility model embodiment adopts is as follows:

A section A + A ² O sewage treatment system, including a pretreatment device, an aeration tank in section A, an advection sedimentation tank, an A ² O biochemical device, and an advanced treatment device;

The pretreatment device, the A-stage aeration tank, the advection sedimentation tank, the A ² O biochemical device, and the advanced treatment device are connected in sequence.

Preferably, the pretreatment device includes a coarse grid, a primary lift pump, a fine grid, and an aeration grit chamber, and the coarse grid, a primary lift pump, a fine grid, and an aeration grit chamber are sequentially The second setting; the aeration grit chamber is connected with the A section aeration tank.

Preferably, the A ² O biochemical device includes an anaerobic tank, anoxic tank, an aerobic tank and a secondary sedimentation tank connected in sequence; the anaerobic tank communicates with the advection sedimentation tank; the secondary sedimentation tank passes through The secondary lift pump is in communication with the advanced treatment device; the secondary sedimentation tank is also in communication with the anaerobic tank through an external return pipeline; the aerobic tank is also in communication with the anoxic tank through an internal return pipeline.

Preferably, the advanced treatment device includes a high-density sedimentation tank, a V-shaped filter tank, and a disinfection contact tank connected in sequence; the high-density sedimentation tank communicates with the secondary sedimentation tank through the secondary lift pump.

Preferably, a sludge return channel is also provided between the A-stage aeration tank and the advection sedimentation tank.

Preferably, the A-stage aeration tank and the aerobic tank are respectively connected with blowers.

Preferably, the advection sedimentation tank, the secondary sedimentation tank and the high-density sedimentation tank are also communicated with the thickening tank through sludge pipelines.

Preferably, the thickening tank is also communicated with a filter press.

Preferably, a water pump for effluent reuse is also provided at the drain of the disinfection contact tank.

In the A-stage + A ² O sewage treatment system of the above-mentioned embodiment, the conventional hydrolysis acidification tank is transformed into the A-stage aeration tank, and the efficient adsorption and flocculation of pollutants in the sewage are realized through the A-section aeration tank, and most of the refractory pollutants are removed. organic matter, which improves the biodegradability of sewage, and uses A ² O biochemical equipment for further biological treatment of sewage, removes most of the pollutants, and then is treated by advanced treatment equipment, and finally realizes that the effluent discharge reaches the first level of GB18918-2002 A standard.

Description of drawings

Fig. 1 is a schematic diagram of the A section + A ² O sewage treatment system provided by the utility model.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the elements of the present invention or there may be intermediate elements at the same time.

It should also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present utility model are only relative concepts or refer to the normal use state of the product, and should not be regarded as restrictive of.

As shown in Figure 1, the embodiment of the utility model provides a section A + A ² O sewage treatment system, the A section + A ² O sewage treatment system includes a pretreatment device, A section aeration tank, advection sedimentation tank , A ² O biochemical device, advanced treatment device.

Wherein, in any embodiment, the pretreatment device is mainly used for the pre-treatment of sewage to ensure the normal operation of the subsequent sewage treatment process. The pretreatment device includes a coarse grid, a primary lift pump, a fine grid and an aeration grit chamber. The coarse grid is the first structure where the sewage enters the A section + A ² O sewage treatment system. The coarse grid is used to intercept suspended solids, sand particles, etc., to remove impurities contained in the sewage that may block the pump unit and valve pipeline. Coarse suspended solids, sand particles, etc., to ensure the normal operation of the subsequent decontamination process.

The primary lift pump is arranged between the coarse grid and the fine grid.

The fine grid is used to remove fine suspended solids and sand particles contained in the sewage that may block the water pump unit and valve pipeline, so as to ensure the normal operation of the subsequent decontamination process.

The water passing through the fine grid is communicated with the aeration grit chamber through a pipeline. The aeration grit chamber is used for aeration and sedimentation treatment of sewage, so as to remove particles such as fine sand contained in the sewage.

In either embodiment, the A-stage aeration tank is derived from the AB method. The aeration tank in section A absorbs, flocculates and settles sewage to remove some pollutants. The aeration tank of section A is provided with a water inlet, a water outlet, an air inlet and a sludge return port. The water inlet of the A-stage aeration tank communicates with the aeration grit chamber, specifically through pipe connection. In order to better realize the aeration treatment of the A-section aeration tank, the A-section aeration tank is connected with the air blower through a pipeline, so that the air blower can supply air to the A-section aeration tank. The A-stage aeration tank communicates with the advection sedimentation tank through a water outlet, specifically through a pipeline to realize the communication between the two.

In any embodiment, the advection sedimentation tank plays the role of mud-water separation, the sewage passing through the advection sedimentation tank becomes clarified, and the activated sludge is concentrated and returned. The advection sedimentation tank is also provided with a water inlet, a water outlet, and two sludge discharge outlets. Specifically, the advection sedimentation tank communicates with the water outlet of the A-stage aeration tank through a water inlet. The sludge generated in the advection sedimentation tank is returned to the A-stage aeration tank through the sludge return channel. Specifically, one end of the sludge return channel is connected to the sludge return port of the A-stage aeration tank, and the other end is connected to a sludge outlet of the advection sedimentation tank; the other sludge discharge port of the advection sedimentation tank is The outlet is communicated with the concentration tank through the pipeline; the water outlet of the advection sedimentation tank is communicated with the A ² O biochemical device through the pipeline.

In any embodiment, the A ² O biochemical device is used for nitrogen and phosphorus removal and COD removal. The A ² O biochemical device includes an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank connected in sequence. The anaerobic pool, the anoxic pool and the aerobic pool are respectively provided with a water inlet, a water outlet and a return port. In addition, the aerobic pool is also provided with an air inlet; port and sludge export.

Specifically, the water inlet of the anaerobic tank communicates with the water outlet of the advection sedimentation tank through a pipeline; the water outlet of the anaerobic tank communicates with the water inlet of the anoxic tank through a pipeline; the anoxic tank The water outlet is communicated with the water inlet of the aerobic pool through a pipeline. The anoxic tank and the aerobic tank realize backflow communication through the internal return channel, so that a part of the mixed liquid flowing out of the aerobic tank is refluxed to the front section of the anoxic tank, so that the nitrate nitrogen is denitrified in the anoxic tank. The air inlet of the aerobic tank is communicated with the blower through a pipeline, the water outlet of the aerobic tank is communicated with the secondary sedimentation tank through a pipeline, and the sludge outlet of the secondary sedimentation tank is connected with the above-mentioned concentration tank through a pipeline. Communication; the secondary settling tank communicates with the anaerobic tank through an external return channel, and the external return channel is respectively connected to the return ports of the secondary settling tank and the anaerobic tank.

In any embodiment, the A ² O biochemical device communicates with the advanced treatment device through a secondary lift pump. Specifically, one end of the secondary lift pump is connected to the secondary sedimentation tank, and the other end is connected to the high-density sedimentation tank of the advanced treatment device.

In any embodiment, the advanced treatment device includes a high-density sedimentation tank, a V-shaped filter tank, and a disinfection contact tank connected in sequence.

Through the secondary lifting pump, the secondary lifting of sewage is realized, that is, the transmission of sewage from the second sedimentation tank to the high-density sedimentation tank is realized.

The high-density sedimentation tank is used for flocculation and sedimentation of the supernatant discharged from the secondary sedimentation tank to further remove SS and colloids in the sewage. The high-density sedimentation tank is provided with a water inlet, a water outlet and a sludge discharge outlet. The water outlet of the high-density sedimentation tank is communicated with the V-shaped filter tank through a pipeline, so that the supernatant produced by the high-density sedimentation tank enters the V-shaped filter tank for further decontamination treatment; the high-density sedimentation tank The sludge outlet is connected to the above-mentioned concentration tank through pipelines to realize further concentration treatment of the sludge discharged from the high-density sedimentation tank.

The V-shaped filter is used for further sand filtration treatment of the sewage discharged from the high-density sedimentation tank, so as to reduce suspended substances in the effluent.

The V-shaped filter tank communicates with the disinfection contact tank through pipelines, so as to discharge the treated water into the disinfection contact tank.

The disinfection contact pool disinfects the water entering it, and then the disinfected water can be discharged through the water outlet of the disinfection contact pool. The water discharged through the disinfection contact pool meets the first grade A standard of GB18918-2002.

In order to better realize the recycling of the effluent from the disinfection contact tank, a water pump can be installed at the water outlet of the disinfection contact tank to realize the reuse of the effluent.

In order to better handle the sludge discharged into the above-mentioned thickening tank from the advection sedimentation tank, the secondary sedimentation tank and the high-density sedimentation tank, the thickening tank is also connected with a filter press, so that the sludge produced by the thickening tank is further processed Dehydration treatment is finally convenient for transportation and other aspects of treatment.

The operation process of the A section + A2O sewage treatment system is: sewage/wastewater/raw water pass through the coarse grid, and the coarse grid intercepts and filters the sewage in the first way to remove coarse suspended solids, sand particles and other substances contained in the sewage, and then The sewage filtered by the coarse grid is lifted by the first-stage lifting pump, and the lifted sewage flows through the fine grid, and the fine grid intercepts and filters the sewage again to remove fine suspended matter and sand particles; after passing through the fine grid The sewage treated by the gate is discharged into the aeration grit chamber to realize the precipitation treatment of fine particles of sewage. The sewage treated by the aeration grit chamber flows into the aeration tank of section A, which absorbs, flocculates and catches the sewage with a sedimentation net; then the sewage is discharged into the advection sedimentation tank, and the advection sedimentation tank further treats the sewage Sedimentation; then the sewage flows into the A ² O biochemical device, and the A ² O biochemical device performs nitrification, denitrification, biological phosphorus removal and most other COD removal on the sewage; the sewage discharged after nitrification, denitrification and biological phosphorus removal treatment enters The secondary sedimentation tank, the sewage is separated from the sludge and water by the secondary sedimentation tank, and then the supernatant enters the secondary lifting pump room, and after being lifted by the secondary lifting pump, it enters the high-density sedimentation tank. In the high-density sedimentation tank, the flocculant (PAC Under the action of , PAM), the mud and water are separated again, and then the supernatant flows into the V-shaped filter, and the V-shaped filter performs sand filtration on the incoming water, and the sand-filtered water is discharged into the contact disinfection tank. Disinfection treatment is carried out in the pool, and the sterilized water can be discharged.

Detecting the water discharged at each stage of the utility model's A-section + A2O sewage treatment system in the process of treating urban sewage, the decontamination effect of each stage can be obtained as follows:

(1) Section A aeration tank: COD removal rate exceeds 42.1%, SS removal rate is greater than or equal to 19.5%;

(2) A ² O biochemical device: the COD removal rate is not less than 72.3%, the ammonia nitrogen removal rate reaches 90.9%, and the SS removal rate reaches 79.7%;

(3) Advanced treatment device: After the advanced treatment device is added with PAC, PAM agent and sand filter, the removal rate of COD is not less than 35.1%, and the removal rate of SS is greater than or equal to 79.9%.

In order to verify the sewage treatment effect of the A section + A ² O sewage treatment system provided by the embodiment of the utility model, it is also decontaminated separately from the conventional hydrolysis acidification tank decontamination system before modification, and the two decontamination methods The water discharged from each decontamination process section is tested for decontamination rate, and the specific data are shown in Tables 1-3.

Table 1 Comparison of COD and SS removal rates between the hydrolytic acidification tank and the A-stage aeration tank

project COD removal rate% SS removal rate% Hydrolytic Acidification Pool 16.0 7.61 A section aeration tank 42.1 19.5 Compared 26.1 11.89

Table 2 Comparison of removal rates of COD, SS and ammonia nitrogen by A ² O biochemical units after the hydrolytic acidification tank was transformed into the A-stage aeration tank

project COD removal rate% SS removal rate% Ammonia nitrogen removal rate% Transformation of the former 76.9 82.3 93.1 After transformation 72.3 79.7 90.9 Compared -4.6 -2.6 -2.2

Table 3 Comparison of COD and SS removal rates of advanced treatment devices after the hydrolytic acidification tank was transformed into the A-stage aeration tank

project COD removal rate% SS removal rate% Transformation of the former 22.1 66.6 After transformation 35.1 79.9 Compared 13 13.3

From the above Tables 1 to 3, it can be known that after the hydrolysis and acidification tank is transformed into the A-section aeration tank, the removal rate of the A-section aeration tank is more than 26.1% for sewage COD and 11.89% for SS compared with the hydrolysis and acidification tank. The decontamination effect of the aeration tank in section A is more obvious; while the removal effect of the A ² O biochemical device has not changed much before and after the transformation; after the transformation, the advanced treatment device has a removal rate of more than 13% for COD and 13.3% for SS . It can be concluded that the A-section + A ² O sewage treatment system formed by transforming the hydrolysis acidification tank into the A-section aeration tank has a better effect on the removal of pollutants in sewage.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. A section A + A ² O sewage treatment system, characterized in that it includes a pretreatment device, a section A aeration tank, an advection sedimentation tank, an A ² O biochemical device, and an advanced treatment device; The pretreatment device, the A-stage aeration tank, the advection sedimentation tank, the A ² O biochemical device, and the advanced treatment device are connected in sequence. 2. The A section + A ² O sewage treatment system as claimed in claim 1, characterized in that: the pretreatment device includes a coarse grid, a primary lift pump, a fine grid and an aeration grit chamber, the Coarse grids, primary lift pumps, fine grids, and aeration grit chambers are arranged in sequence; the aeration grit chambers are connected to the A-section aeration tanks. 3. According to any one of claims 1 to 2, the A section + A ² O sewage treatment system is characterized in that: the A ² O biochemical device includes anaerobic pool, anoxic pool, aerobic pool and two Settling tank; the anaerobic tank is communicated with the advection sedimentation tank; the secondary settling tank is communicated with the advanced treatment device through a secondary lift pump; the secondary settling tank is also connected with the anaerobic tank through an external return pipeline communicated; the aerobic pool is also communicated with the anoxic pool through an internal return pipeline. 4. The A-stage + A ² O sewage treatment system according to any one of claims 1-2, characterized in that: the advanced treatment device includes a high-density sedimentation tank, a V-shaped filter tank, and a disinfection contact tank connected in sequence ; The high-density sedimentation tank communicates with the secondary sedimentation tank through the secondary lift pump. 5. The A-section + A ² O sewage treatment system according to any one of claims 1-2, characterized in that: a sludge return channel is provided between the A-section aeration tank and the advection sedimentation tank. 6. The A-section + A ² O sewage treatment system according to any one of claims 1 and 3, characterized in that: the A-section aeration tank and the aerobic tank are respectively connected with blowers. 7. The A-section + A ² O sewage treatment system as claimed in any one of claims 1, 3, and 4, characterized in that: the advection sedimentation tank, the secondary sedimentation tank, and the high-density sedimentation tank also pass through sludge pipelines and The concentration pool is connected. 8. The A-stage + A ² O sewage treatment system according to claim 7, characterized in that: the concentration pool is also connected to a filter press. 9 . The sewage treatment system of section A + A ² O as claimed in claim 7 , wherein a water pump for reuse of effluent is provided at the drain of the disinfection contact pool. 10 .