CN211595354U

CN211595354U - Sewage treatment system

Info

Publication number: CN211595354U
Application number: CN201922073166.7U
Authority: CN
Inventors: 郑仕雪
Original assignee: Chongqing Spark Environmental Protection Technology Co ltd
Current assignee: Chongqing Spark Environmental Protection Technology Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-09-29
Anticipated expiration: 2029-11-26

Abstract

The utility model discloses a sewage treatment system, including means such as acid-base treatment, dephosphorization, catalytic oxidation and biological filter treatment, adopt technical and technological techniques such as electrochemistry, biochemistry and physical chemistry to combine together, form one set of membrane treatment that does not need similar RO membrane etc. can make high concentration organic waste water reach relevant standard after this technology is handled.

Description

Sewage treatment system

Technical Field

The utility model relates to a water treatment technical field especially relates to a sewage treatment system.

Background

At present, most of high-concentration organic sewage is filtered by adopting a biological, chemical oxidation and double-membrane method. The effluent water filtered by the double membranes in the process can meet the requirements of relevant standards, but a large amount of concentrated solution is generated, and most of the produced concentrated solution is subjected to evaporation treatment. And the concentrated solution generated by the evaporator is treated, so that the treatment difficulty is higher. The leakage liquid produced by the refuse landfill is treated by a double-membrane method, and the concentrated solution is mostly treated by a recharging method. And (4) recharging the mixture to a landfill, and mixing the mixture with liquid generated by the landfill to form landfill leachate with higher concentration. Forming a vicious circle and increasing the load of the original treatment facility. The long-term backflow can cause the original treatment facility to bear a great load. The utility model discloses adopt technical skill such as electrochemistry, biochemistry and physical chemistry to combine together to above-mentioned condition, form one set and need not the membrane treatment of similar RO membrane etc. can make high concentration organic waste water reach relevant standard after this technology handles.

Therefore, the technical personnel in the field are dedicated to develop a sewage treatment system with low cost and good water purification effect.

Disclosure of Invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a sewage treatment system with low cost and good water purification effect.

In order to achieve the purpose, the utility model provides a sewage treatment system, which comprises a raw water treatment tank, a catalytic oxidation tower, a pH adjusting tank, a primary sedimentation tank, an anaerobic reactor, a chemical dephosphorization reaction tank, a secondary sedimentation tank, a BAF-C/N biological filter tank, a BAF-DN biological filter tank, an electrochemical treatment tank, a tertiary sedimentation tank and a clean water tank which are connected in sequence.

The anaerobic reactor is an up-flow anaerobic sludge bed, an anaerobic baffle plate reactor or a composite anaerobic baffle plate reactor.

The raw water treatment tank is provided with a first compressed air inlet, and the first compressed air inlet is connected with a first air compressor; the BAF-C/N biological filter is provided with a second compressed air inlet, and the second compressed air inlet is connected with a second air compressor; the BAF-N biological filter is provided with a third compressed air inlet, and the third compressed air inlet is connected with a third air compressor.

The primary sedimentation tank is provided with a first sludge discharge pipe; the secondary sedimentation tank is provided with a second sludge discharge pipe; and the tertiary sedimentation tank is provided with a third sludge discharge pipe.

The clean water tank is provided with a water outlet and is also connected with the water inlet of the BAF-C/N biological filter, the water inlet of the BAF-N biological filter and the water inlet of the BAF-DN biological filter.

The utility model has the advantages that: the utility model discloses a sewage treatment system, including means such as acid-base treatment, dephosphorization, catalytic oxidation and biological filter treatment, adopt technical and technological techniques such as electrochemistry, biochemistry and physical chemistry to combine together, form one set of membrane treatment that does not need similar RO membrane etc. can make high concentration organic waste water reach relevant standard after this technology is handled.

Drawings

FIG. 1 is a schematic structural view of the sewage treatment system of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein it is noted that, in the description of the invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular manner, and therefore should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in figure 1, the sewage treatment system comprises a raw water treatment tank, a catalytic oxidation tower, a pH adjusting tank, a primary sedimentation tank, an anaerobic reactor, a chemical dephosphorization reaction tank, a secondary sedimentation tank, a BAF-C/N biological filter tank, a BAF-DN biological filter tank, an electrochemical treatment tank, a tertiary sedimentation tank and a clean water tank which are connected in sequence.

In this embodiment, the anaerobic reactor is an upflow anaerobic sludge blanket, an anaerobic baffled reactor or a composite anaerobic baffled reactor.

Among them, the upflow anaerobic sludge blanket is called UASB for short, which is one of the most widely applied reactor forms in modern high-efficiency anaerobic treatment process. Sewage enters from the bottom of the reactor and is pushed by water power, and sludge is in an expansion state in the reactor. The mixed liquid is fully reacted and then enters a settling zone with an expanded sectional area, the generated methane enters a gas collection system from the upper part through a three-phase separator, and the sludge returns to the reaction zone by gravity. Sometimes, soft packing is added to the reactor to provide a surface for organisms to grow on, thereby increasing biomass. Its advantages are simple structure, high load rate, short hydraulic stay time, low energy consumption and no need of sludge reflux unit.

The Anaerobic Baffled Reactor (ABR) is characterized in that: the reactor is internally provided with a vertical guide plate to divide the reactor into a plurality of reaction chambers connected in series, each reaction chamber is a relatively independent upflow sludge bed system, and the sludge exists in a granular form or a flocculent form. The water flow is guided by the guide plate to flow upwards and downwards in a baffling way and passes through the sludge bed layers in the reaction chamber one by one, and the substrates in the inlet water are fully contacted with the microorganisms to be degraded and removed.

ABR with packing placed in the upper space of the reaction chamber is called a composite anaerobic baffled reactor (HABR). After the filler is added, the total amount of organisms is increased by utilizing the original invalid volume, and the separation of sludge and bubbles is accelerated, so that the loss of the sludge is reduced. Research results show that the performance of the ABR added with the filler is better than that before the ABR is added during the starting period and under the normal operation condition, and the cost of the reactor can not be obviously increased by adding the filler.

The raw water treatment tank is provided with a first compressed air inlet 1 which is connected with a first air compressor; the BAF-C/N biological filter is provided with a second compressed air inlet 2 which is connected with a second air compressor; the BAF-N biological filter is provided with a third compressed air inlet 3 which is connected with a third air compressor.

A Biological Aerated Filter (BAF) is an aerobic or anoxic bioreactor adopting a granular Filter material to fix a Biological membrane, integrates Biological contact oxidation and suspended matter Filter bed interception functions, can effectively remove SS, CODcr, BOD5, NH3-N, TN, TP and AOX (harmful substances) in water, hardness, turbidity, chroma and the like, and is suitable for municipal sewage, industrial sewage, regenerated and recycled water advanced treatment, water source pretreatment of water pollution and the like. Wherein BAF-C/N, organic pollutants are removed and nitrified at the same time; BAF-N for nitration and removal of NH 3-N; BAF-DN for denitrification to remove TN.

The primary sedimentation tank is provided with a first sludge discharge pipe 4, the secondary sedimentation tank is provided with a second sludge discharge pipe 5, the tertiary sedimentation tank is provided with a third sludge discharge pipe 6, and the first sludge discharge pipe 4, the second sludge discharge pipe 5 and the third sludge discharge pipe 6 are used for discharging sludge.

The clean water tank is provided with a water outlet 7, and the water outlet of the clean water tank is responsible for recovering the clean water after thorough treatment; the clean water tank is also connected with the water inlet of the BAF-C/N biological filter tank, the water inlet of the BAF-N biological filter tank and the water inlet of the BAF-DN biological filter tank, and the clean water in the clean water tank can also be used for backwashing the BAF-C/N biological filter tank, the BAF-N biological filter tank and the BAF-DN biological filter tank, and has simple structure and convenient cleaning.

The working flow of the sewage treatment system is as follows:

the method comprises the following steps that raw sewage flows into a raw water treatment tank, an acidic chemical is added into the raw water treatment tank, the pH of the raw sewage is adjusted to 3-4, compressed air is pumped into the raw water treatment tank by a first air compressor, the air is compressed at the air adding amount of 5-6m of each cubic meter of the raw water, and then the raw sewage flows into a catalytic oxidation tower for catalytic oxidation; the catalytic oxidation tower is also added with oxidation catalysts which are Fe, C and RuO₂One of

The raw water of the oxidized sewage flowing out of the catalytic oxidation tower enters a pH adjusting tank, alkaline substances are added for neutralization, the alkaline chemicals are sodium hydroxide, potassium hydroxide or magnesium hydroxide containing hydroxide radical examples, the alkaline chemicals are uniformly mixed to enable the pH of the raw water of the neutralized sewage to be in the range of 7-8.5 (according to different raw water), and then the raw water of the neutralized sewage flows into a primary sedimentation tank.

And (3) standing and precipitating the neutralized sewage raw water in a primary sedimentation tank, discharging suspended substance precipitates generated by treatment and pH adjustment of the catalytic oxidation tower out of the primary sedimentation tank through a first sludge discharge pipe at the bottom, basically removing heavy metals harmful to organisms by precipitated first supernatant, and reducing the Chemical Oxygen Demand (COD) of the first supernatant by about 30 percent compared with untreated sewage raw water.

The first supernatant obtained by the primary sedimentation tank enters the anaerobic reactor from the bottom of the anaerobic reactor upwards, COD can be reduced by 20-50 percent (different from raw water) after the treatment of the anaerobic reactor, and the BOD/COD value can be increased by 0.2-0.3.

And (3) enabling the first supernatant after the anaerobic reaction to flow into a chemical dephosphorization reaction tank, adding a dephosphorization agent into the first supernatant after the anaerobic reaction, uniformly stirring by compressed air, and carrying out mixed reaction. And then the sewage flows into a secondary sedimentation tank to obtain second supernatant and second sludge, the content of suspended matters in the second supernatant is less than 60 mg/L, and the second sludge is discharged through a second sludge discharge pipe at the bottom.

And enabling the second supernatant to flow into the BAF-C/N biological filter from the bottom of the BAF-C/N biological filter, wherein the BAF-C/N biological filter is provided with a filter layer, an aerator pipe is arranged in the filter layer, the aeration amount is 10-15 m/cubic meter of water for air cultivation, and under the condition of water-gas mixing, COD removal (the COD is reduced to about 60 mcl) and partial nitrification are respectively completed through biological fillers, so that the filtered water of the first filter is obtained.

Filtered water in the first filter tank flows into the tank from the bottom of the BAF-N biological filter tank for nitration reaction treatment, and flows upwards to a packing layer of the N biological filter tank, wherein an aeration pipe is arranged in the packing layer, and the aeration amount is 5-8 m air for each cubic meter of water during the year of thin film planting. Under the condition of oxygen, the microorganisms in different filter layers carry out nitration reaction on pollutants in the water to obtain the filtered water of the second filter.

Filtered water in the second filter tank flows into the filter tank from the bottom of the BAF-DN biological filter tank, denitrification is carried out through the filter layer under the anoxic condition, and glucose, methanol and the like can be added as carbon sources if carbon sources are lacked in the process, so as to obtain third sediment filtered water.

And then introducing the filtered water of the third precipitation into the bottom of an electrochemical treatment tank, wherein positive and negative electrode plates are arranged in the electrochemical treatment tank, and the water flows from bottom to top in the electrochemical treatment tank and passes through gaps between the positive and negative electrode plates to treat the chromaticity and residual pollutants in the gaps. The electrochemical treatment cell uses direct current, the voltage is 5-10v, and the current is 1000 + 2500A/m per square meter of positive and negative electrode plates³And reacting for 2-5 hours (different from raw water) to obtain water after electrochemical reaction.

And introducing the water after the electrochemical reaction into a tertiary sedimentation tank for sedimentation and filtration to obtain third supernatant and third sludge, discharging the third sludge, wherein the third supernatant is finally obtained treated clear water, and the whole treatment process is finished.

And finally, adding an acidic chemical and an alkaline chemical into the first sludge, the second sludge and the third sludge for neutralization treatment, then placing the sludge in a dehydrator for dehydration treatment to obtain dehydrated sludge and treated sewage, and collecting the treated sewage into a raw water treatment tank for retreatment.

In addition, the clean water in the clean water tank can also be used for back flushing the BAF-C/N biological filter, the BAF-N biological filter and the BAF-DN biological filter.

The utility model discloses a high concentration organic sewage treatment method and sewage treatment system, including means such as acid-base treatment, dephosphorization treatment, catalytic oxidation and biological filter treatment, adopt technical and technological techniques such as electrochemistry, biochemistry and physical chemistry to combine together, form one set of membrane treatment that does not need similar RO membrane etc. can make high concentration organic waste water reach relevant standard after this technology is handled.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A sewage treatment system is characterized in that: comprises a raw water treatment tank, a catalytic oxidation tower, a pH adjusting tank, a primary sedimentation tank, an anaerobic reactor, a chemical dephosphorization reaction tank, a secondary sedimentation tank, a BAF-C/N biological filter, a BAF-DN biological filter, an electrochemical treatment tank, a tertiary sedimentation tank and a clean water tank which are connected in sequence.

2. The wastewater treatment system according to claim 1, wherein: the anaerobic reactor is an up-flow anaerobic sludge bed, an anaerobic baffle plate reactor or a composite anaerobic baffle plate reactor.

3. The wastewater treatment system according to claim 1, wherein: the raw water treatment tank is provided with a first compressed air inlet, and the first compressed air inlet is connected with a first air compressor; the BAF-C/N biological filter is provided with a second compressed air inlet, and the second compressed air inlet is connected with a second air compressor; the BAF-N biological filter is provided with a third compressed air inlet, and the third compressed air inlet is connected with a third air compressor.

4. The wastewater treatment system according to claim 1, wherein: the primary sedimentation tank is provided with a first sludge discharge pipe; the secondary sedimentation tank is provided with a second sludge discharge pipe; and the tertiary sedimentation tank is provided with a third sludge discharge pipe.

5. The wastewater treatment system according to claim 1, wherein: the clean water tank is provided with a water outlet and is also connected with the water inlet of the BAF-C/N biological filter, the water inlet of the BAF-N biological filter and the water inlet of the BAF-DN biological filter.