CN218951190U - Production wastewater treatment device - Google Patents

Abstract

The utility model provides a production wastewater treatment device which comprises a sterilization unit, a wastewater purification system and a sludge treatment unit which are sequentially connected, wherein the wastewater purification system and the sludge treatment unit are connected with an odor treatment unit; the odor treatment unit comprises an alkaline washing tower, a water washing tower and a biological filtering tower which are sequentially connected, and the production wastewater treatment device is characterized in that a sterilizing unit is arranged, sodium hypochlorite is added to kill pathogenic microorganisms, then a reducing agent is added to neutralize the pathogenic microorganisms, so that the pathogenic microorganisms can be killed, and the survival of wastewater purification microorganisms in a wastewater purification system can not be influenced; in addition, by arranging the odor treatment unit, harmful tail gas generated in the wastewater purification system and the sludge treatment unit can be effectively purified.

Description

Production wastewater treatment device

Technical Field

The utility model relates to the field of water treatment, in particular to a production wastewater treatment device.

Background

The production wastewater refers to wastewater discharged from all discharge ports to the external environment in the production and scientific research processes of enterprises and institutions; the main pollutant of the production wastewater is COD and BOD ₅ Pathogenic microorganisms such as ammonia nitrogen, total phosphorus, total nitrogen and escherichia coli.

The existing production wastewater treatment device generally adopts a biological treatment method to purify COD and BOD in the production wastewater ₅ The ammonia nitrogen, the total phosphorus and the total nitrogen are adsorbed by microorganisms and biologically metabolized, and the micro-organisms are completed by separating mud from water after biochemical reactionThe biological recycling and the separation and discharge of the purified water are not clear for pathogenic microorganisms such as escherichia coli, the normal growth and reproduction of the microorganisms in the purified sludge are affected by the pathogenic microorganisms, the purification effect is reduced, and a large amount of odor such as ammonia gas, hydrogen sulfide and the like can be generated by the biological treatment method when harmful substances are metabolized by the microorganisms, so that the atmospheric environment can be polluted by direct discharge.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, an object of the present utility model is to provide a production wastewater treatment apparatus for solving the problems that it is difficult to remove pathogenic microorganisms and it is impossible to treat odor in the conventional production wastewater treatment apparatus.

To achieve the above and other related objects, the present utility model provides a production wastewater treatment apparatus, including a sterilization unit, a wastewater purification system, and a sludge treatment unit, which are sequentially connected, wherein the wastewater purification system and the sludge treatment unit are connected with an odor treatment unit;

the odor treatment unit comprises an alkaline washing tower, a water washing tower and a biological filtering tower which are sequentially connected.

In an embodiment of the utility model, the sterilization unit includes an oxidation tank and a reduction tank, sodium hypochlorite is added in the oxidation tank, and a reducing agent is added in the reduction tank.

In an embodiment of the utility model, the wastewater purification system comprises a purification unit, a mud-water separation unit and a desalination unit which are sequentially arranged, wherein the mud-water separation unit is connected with a sludge treatment unit.

In one embodiment of the utility model, the purification unit comprises an anoxic tank and an aerobic tank.

In an embodiment of the utility model, the sludge-water separation unit includes an MBR tank connected with the aerobic tank, and a membrane bioreactor is arranged in the MBR tank.

In an embodiment of the utility model, the desalting unit comprises an RO device connected with the MBR tank, a concentrate tank connected with the RO device and a clean water tank.

In one embodiment of the utility model, the sludge treatment unit comprises a sludge tank connected with the MBR tank and a plate-and-frame filter press connected with the sludge tank.

In an embodiment of the utility model, the biological filter tower comprises a tower body, a packing layer positioned in the tower body and a water dispersing spray device arranged above the packing layer.

In one embodiment of the present utility model, the filler layer is a carbonaceous bio-filler layer.

As described above, the present utility model has the following advantageous effects: difficult to remove pathogenic microorganisms and incapable of treating odor

According to the utility model, the sterilizing unit is arranged, and the sodium hypochlorite is added to kill pathogenic microorganisms and then the reducing agent is added to neutralize, so that pathogenic microorganisms can be killed, and the survival of wastewater purifying microorganisms in the wastewater purifying system can not be influenced; in addition, by arranging the odor treatment unit, harmful tail gas generated in the wastewater purification system and the sludge treatment unit can be effectively purified.

Drawings

Fig. 1 shows a flow chart of a production wastewater treatment apparatus disclosed in an embodiment of the present utility model.

Fig. 2 is a flow chart showing a deodorizing unit of a production wastewater treatment apparatus according to an embodiment of the present utility model.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

Please refer to fig. 1-2. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to FIGS. 1-2, the present utility model provides preferred embodiments:

the production wastewater treatment device comprises a sterilization unit, a wastewater purification system and a sludge treatment unit which are sequentially connected, wherein the wastewater purification system and the sludge treatment unit are connected with an odor treatment unit;

the odor treatment unit comprises an alkaline washing tower, a water washing tower and a biological filtering tower which are connected in sequence; a great amount of odor is generated in the anoxic tank, the aerobic tank and the sludge tank, and main pollutants are ammonia gas and hydrogen sulfide; therefore, a large amount of ammonia gas can be removed through the alkaline washing tower, a large amount of hydrogen sulfide can be absorbed through the water washing tower, and the residual ammonia gas, hydrogen sulfide and other harmful gases are subjected to metabolic decomposition or absorption through the biological filter tower.

The sterilizing unit comprises an oxidation tank and a reduction tank, sodium hypochlorite is added in the oxidation tank, and a reducing agent is added in the reduction tank; the sodium hypochlorite is strong alkali weak acid salt, and the sterilization principle of the sodium hypochlorite is mainly that hypochlorous acid is formed by hydrolysis of the sodium hypochlorite, and then the hypochlorous acid is further decomposed to form nascent oxygen [ O ], so that the protein of the thallus is denatured by the extremely strong oxidizing property of the nascent oxygen, and pathogenic microorganisms die; hypochlorous acid can act on cell walls in the sterilization process, has small hypochlorous acid molecules and no charge, can penetrate into the bacterial body to perform oxidation reaction with bacterial proteins, nucleic acid, enzymes and the like, so that pathogenic microorganisms are killed; meanwhile, the chloride ions can also obviously change the osmotic pressure of bacteria to lose activity and die; wherein the reducing agent uses sodium thiosulfate, and sodium hypochlorite in water is neutralized to prevent the sodium hypochlorite from affecting the subsequent strain for biochemical purification.

The wastewater purification system comprises a purification unit, a mud-water separation unit and a desalination unit which are sequentially arranged, wherein the mud-water separation unit is connected with the sludge treatment unit; the concentrated water produced after the desalting unit can be further concentrated through single-effect evaporation, so that the subsequent treatment is convenient, and the heat source of the single-effect evaporation is heat conduction oil in an electric heating mode.

The purifying unit comprises an anoxic tank and an aerobic tank. Organic nitrogen, protein nitrogen and the like in the sewage are firstly oxidized or hydrolyzed to be converted into ammonia nitrogen under the aerobic or anaerobic condition, and then oxidized to be nitrate nitrogen under the action of aerobic autotrophic nitrifying bacteria, and the stage is called aerobic nitrifying; then under the anoxic condition, electrons and protons are provided by denitrifying bacteria and a carbon source exists, nitrate nitrogen is used as an electron acceptor, so that the nitrate nitrogen is reduced into nitrogen gas to escape from sewage, and the stage is called anoxic denitrification;

when the activated sludge process is used for treating sewage, the activated sludge is alternately operated in anaerobic and aerobic states, so that phosphorus accumulating bacteria which accumulate excessive phosphate can grow predominantly, and the phosphorus content of the activated sludge is higher than that of common activated sludge; phosphorus accumulating bacteria in the sludge release phosphorus in an anaerobic state, and excessive phosphorus is taken in an aerobic state, so that phosphorus in the wastewater is absorbed;

therefore, to carry out biological denitrification and dephosphorization of sewage, an anoxic/aerobic process is needed to form an anoxic tank and an aerobic tank; the anaerobic and aerobic environment can be created at different stages of a biological pond; i.e. both require an anoxic/aerobic system.

The mud-water separation unit comprises an MBR tank connected with the aerobic tank, and a membrane bioreactor is arranged in the MBR tank. MBR is a short name of Membrane bioreactor (Membrane Bio-Reactor), which is a novel water treatment technology organically combining a Membrane separation technology with a biotechnology, and utilizes Membrane separation equipment to intercept activated sludge and macromolecular organic matters in a biochemical reaction tank, thereby omitting a secondary sedimentation tank; the membrane bioreactor strengthens the function of the bioreactor through the membrane separation technology, and improves the concentration of activated sludge.

The desalting unit comprises an RO device connected with the MBR tank, a concentrate tank connected with the RO device and a clean water tank; reverse Osmosis (RO) technology is a relatively advanced and effective desalination technology today, and its principle is that water molecules permeate reverse osmosis membranes to remove most of the ions under pressure; impurities in the water are trapped by the reverse osmosis membrane and carried out along with the concentrated water. The reverse osmosis technology can effectively remove dissolved salts, colloid, bacteria, viruses, bacterial endotoxin, most of organic matters and other impurities in water.

The sludge treatment unit comprises a sludge tank connected with the MBR tank and a plate-and-frame filter press connected with the sludge tank; the odor which goes out most of ammonia and hydrogen sulfide through the alkaline washing tower and the water washing tower enters the biological filter tower, is absorbed by the carbon biological filler layer through the filler layer, and is absorbed and metabolized by microorganisms in the filler layer to be decomposed into harmless gas; in order to maintain the activity of microorganisms in the filler layer, tap water of a sewage treatment plant added with nutrient solution is used as a water source of a water dispersing system, and the water dispersing system comprises a spray pipe, a spray nozzle, an electric valve and a timing control system. The water scattering frequency is once per hour to ensure the activity of microorganisms in the filler layer.

The biological filter tower comprises a tower body, a packing layer positioned in the tower body and a water dispersing spray device arranged above the packing layer.

The filler layer is a carbon biological filler layer; the carbonaceous biological filler layer is a carbonaceous material prepared by firing single natural plants, the average diameter of filler particles is 5-25mm, the carbonaceous biological filler has good moisture retention and air permeability, and the surface of the carrier is hydrophilic and does not need continuous water dispersion.

Wherein the aerobic tank and the MBR tank are also provided with fans for supplying oxygen; the mixed liquid in the aerobic tank can be led to flow back to the anoxic tank, so that the content of microorganisms for purification in the anoxic tank is improved; in addition, part of sludge separated from the MBR tank can flow back to the anoxic tank, the content of microorganisms for purification in the anoxic tank is also improved, and redundant sludge is introduced into the sludge tank for sludge treatment.

In the utility model, the production wastewater firstly enters an adjusting pipe, the flow is adjusted by a pump and then is pumped into an oxidation tank at a constant speed, sodium hypochlorite is added into the oxidation tank, after pathogenic microorganisms are killed, the wastewater enters a reduction tank, sodium thiosulfate is added into the reduction tank to neutralize the sodium hypochlorite, then the wastewater enters a purifying unit, the wastewater sequentially passes through an anoxic tank and an aerobic tank, nitrogen and phosphorus in the wastewater are biologically purified, then the wastewater enters an MBR tank for performing mud-water separation, part of sludge flows back to the anoxic tank to supplement the content of microorganisms for purification in the anoxic tank, the other part of sludge enters a sludge tank and then is subjected to sludge dehydration by a plate-and-frame filter press so as to facilitate subsequent harmless treatment, the sewage enters an MBR water producing tank for storage, then the sewage is pumped into an RO device for desalination treatment, the produced clear water can be recycled or discharged again, and the produced concentrated water is stored into an RO concentrated water tank after single-effect evaporation to form concentrated solution for storage so as to facilitate subsequent treatment; in addition, the air exhaust generated in the anoxic tank, the aerobic tank and the sludge tank is purified by a deodorizing device and then discharged by an induced draft fan.

In summary, the sterilizing unit is arranged, and the sodium hypochlorite is added to kill pathogenic microorganisms and then the reducing agent is added to neutralize, so that pathogenic microorganisms can be killed, and the survival of wastewater purification microorganisms in the wastewater purification system can not be influenced; in addition, by arranging the odor treatment unit, harmful tail gas generated in the wastewater purification system and the sludge treatment unit can be effectively purified.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (9)

1. The production wastewater treatment device is characterized by comprising a sterilization unit, a wastewater purification system and a sludge treatment unit which are sequentially connected, wherein the wastewater purification system and the sludge treatment unit are connected with an odor treatment unit;

the odor treatment unit comprises an alkaline washing tower, a water washing tower and a biological filtering tower which are sequentially connected.

2. The apparatus according to claim 1, wherein the sterilizing unit comprises an oxidation tank to which sodium hypochlorite is added and a reduction tank to which a reducing agent is added.

3. The apparatus according to claim 1, wherein the wastewater purification system comprises a purification unit, a sludge-water separation unit, and a desalting unit, which are sequentially disposed, and the sludge-water separation unit is connected to the sludge treatment unit.

4. A process wastewater treatment plant according to claim 3, wherein said purification unit comprises an anoxic tank and an aerobic tank.

5. The apparatus of claim 4, wherein the sludge-water separation unit comprises an MBR tank connected to the aerobic tank, and a membrane bioreactor is disposed in the MBR tank.

6. The apparatus of claim 5, wherein the desalination unit comprises an RO device connected to the MBR tank, a concentrate tank connected to the RO device, and a clean water tank.

7. The apparatus of claim 5, wherein the sludge treatment unit comprises a sludge tank connected to the MBR tank, and a plate and frame filter press connected to the sludge tank.

8. The apparatus of claim 1, wherein the biological filter tower comprises a tower body, a packing layer positioned in the tower body, and a water spraying device positioned above the packing layer.

9. The wastewater treatment apparatus of claim 8, wherein the filler layer is a carbonaceous bio-filler layer.

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