Intensive industrial wastewater advanced treatment system

Abstract

The utility model provides an intensive industrial wastewater advanced treatment system. The intensive industrial wastewater advanced treatment system comprises a biochemical pretreatment unit, a magnetic coagulation sedimentation tank, a denitrification deep bed filter tank and an active coke adsorption tower which are connected in sequence, a water outlet of the biochemical pretreatment unit is connected with a water inlet of the magnetic coagulative precipitation tank, and the magnetic coagulative precipitation tank is used for carrying out coagulative precipitation on suspended matters and total phosphorus in biochemical effluent of the biochemical pretreatment unit; a water inlet of the denitrification deep-bed filter tank is connected with a water outlet of the magnetic coagulative precipitation tank, and the denitrification deep-bed filter tank is used for denitrifying and filtering effluent of the magnetic coagulative precipitation tank; a water inlet of the active coke adsorption tower is connected with a water outlet of the denitrification deep-bed filter tank, and the active coke adsorption tower is used for further treating effluent COD (Chemical Oxygen Demand) and chroma pollutants of the denitrification deep-bed filter tank. The utility model can effectively ensure that the effluent reaches the standard and is discharged, and also has the advantages of stable operation, reasonable and compact structure, small occupied area and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater treatment, and specifically, to an intensive industrial wastewater advanced treatment system. Background Art

[0002] With the continuous growth of the economy and the acceleration of the industrialization process, the discharge of industrial wastewater shows a significant upward trend. These wastewaters contain a large number of harmful substances, which will pose a serious threat to the environment and human health if not properly treated. Therefore, more and more attention has been paid to industrial wastewater treatment.

[0003] At present, industrial wastewater treatment faces double challenges in terms of technology and space. Technologically, the composition of industrial wastewater is complex and contains a variety of refractory substances. With the improvement of environmental protection standards, traditional wastewater treatment methods often fail to meet the more stringent discharge requirements, and more advanced advanced treatment technologies need to be developed and applied. At the same time, with the acceleration of the urbanization process, the contradiction between the land demand of sewage treatment plants and the urban development land is becoming increasingly prominent. Many industrial wastewater treatment plants are facing problems such as tight land resources and limited expansion space. Therefore, how to improve the sewage treatment efficiency within a limited space and solve the problem of tight land use has become an urgent problem to be solved in the current field of industrial wastewater treatment. Summary of the Utility Model

[0004] Aiming at the defects in the prior art, the purpose of the utility model is to provide an intensive industrial wastewater advanced treatment system.

[0005] The utility model is realized by the following technical solutions:

[0006] The utility model provides an intensive industrial wastewater advanced treatment system, which includes a biochemical pretreatment unit, a magnetic coagulation sedimentation tank, a denitrification deep bed filter, and an activated coke adsorption tower connected in sequence;

[0007] The water outlet of the biochemical pretreatment unit is connected to the water inlet of the magnetic coagulation sedimentation tank, and the magnetic coagulation sedimentation tank coagulates and precipitates suspended solids and total phosphorus in the biochemical effluent of the biochemical pretreatment unit;

[0008] The water inlet of the denitrification deep bed filter is connected to the water outlet of the magnetic coagulation sedimentation tank, and the denitrification deep bed filter performs denitrification and filtration treatment on the water outlet of the magnetic coagulation sedimentation tank;

[0009] The water inlet of the activated coke adsorption tower is connected to the water outlet of the denitrification deep bed filter, and the activated coke adsorption tower further treats the COD and color pollutants in the water outlet of the denitrification deep bed filter.

[0010] Further, the biochemical pretreatment unit includes a coarse grille lifting pump house, a fine grille grit chamber, a hydrolysis adjustment tank, a biochemical tank, and a secondary sedimentation tank that are connected in sequence. The outlet of the secondary sedimentation tank is connected to the inlet of the magnetic coagulation sedimentation tank.

[0011] Further, a lifting well is provided between the denitrifying deep bed filter and the activated coke adsorption tower, and the lifting well lifts the effluent of the denitrifying deep bed filter to the activated coke adsorption tower.

[0012] Further, the magnetic coagulation sedimentation tank includes a coagulation tank, a loading tank, a flocculation tank, and a sedimentation tank that are arranged in sequence. The flocculation tank is used to promote the aggregation and sedimentation of particles.

[0013] Further, the magnetic coagulation sedimentation tank further includes a PAC dosing device, and the PAC dosing device is used to dose PAC medicament into the coagulation tank.

[0014] Further, the magnetic coagulation sedimentation tank includes a magnetic powder dosing device, and the magnetic powder dosing device is used to dose magnetic powder into the loading tank.

[0015] Further, the magnetic coagulation sedimentation tank further includes a sludge shearing machine and a magnetic separator. The sludge shearing machine is used to strip the sludge precipitated by the magnetic coagulation sedimentation tank, and the magnetic separator is used to recover the magnetic powder in the stripped sludge.

[0016] Further, the magnetic coagulation sedimentation tank further includes a PAM dosing device, and the PAM dosing device is used to dose PAM medicament into the flocculation tank.

[0017] Further, the system further includes a sodium acetate dosing device, and the sodium acetate dosing device is connected to the denitrifying deep bed filter. The sodium acetate dosing device is used to dose sodium acetate into the denitrifying deep bed filter.

[0018] Further, the system further includes a sodium hypochlorite dosing device, and the sodium hypochlorite dosing device is connected to the inlet of the activated coke adsorption tower. The sodium hypochlorite dosing device is used to dose sodium hypochlorite into the activated coke adsorption tower.

[0019] Compared with the prior art, the present utility model has at least one of the following beneficial effects:

[0020] Based on the properties of industrial wastewater, the present utility model sequentially arranges a biochemical pretreatment unit, a magnetic coagulation sedimentation tank, a denitrifying deep bed filter, and an activated coke adsorption tower. Through the scientific and reasonable setting and combination of each treatment unit, the structure is reasonable and compact, and it has excellent removal effects on pollutants such as TP, TN, SS, COD, and chromaticity in industrial wastewater. The pollutant removal effect is good, which can effectively ensure the up-to-standard discharge of the effluent. At the same time, it also has the advantages of stable operation and small floor area. Description of the Drawings

[0021] Other features, objects, and advantages of the present utility model will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings:

[0022] Figure 1 It is a schematic structural diagram of a combined system for intensive advanced treatment of industrial wastewater in an embodiment of the present utility model;

[0023] Figure 2 It is a process flow diagram of a combined system for intensive advanced treatment of industrial wastewater in an embodiment of the present utility model.

[0024] In the figure: 1 - magnetic coagulation sedimentation tank, 2 - denitrifying deep bed filter, 3 - lift well, 4 - activated coke adsorption tower, 5 - PAC dosing device, 6 - PAM dosing device, 7 - magnetic powder dosing device, 8 - sodium acetate dosing device, 9 - sodium hypochlorite dosing device. Specific embodiments

[0025] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can be made. These all belong to the protection scope of the present utility model.

[0026] Referring to Figure 1 As shown, it is a schematic structural diagram of an intensive industrial wastewater advanced treatment system in an embodiment of the present utility model. The system includes a biochemical pretreatment unit, a magnetic coagulation sedimentation tank 1, a denitrifying deep bed filter 2, and an activated coke adsorption tower 4 connected in sequence; the water outlet of the biochemical pretreatment unit is connected to the water inlet of the magnetic coagulation sedimentation tank 1, as Figure 1As shown in the figure, the influent water represents the biochemical effluent of the biochemical pretreatment unit. The magnetic coagulation sedimentation tank 1 performs coagulation sedimentation on the suspended solids and total phosphorus in the biochemical effluent of the biochemical pretreatment unit. The inlet of the denitrifying deep bed filter 2 is connected to the outlet of the magnetic coagulation sedimentation tank 1, and the denitrifying deep bed filter 2 performs denitrification and filtration on the effluent of the magnetic coagulation sedimentation tank 1. The inlet of the activated coke adsorption tower 4 is connected to the outlet of the denitrifying deep bed filter 2, and the activated coke adsorption tower 4 removes pollutants such as COD and chromaticity in the effluent of the denitrifying deep bed filter 2 through adsorption. In the system provided by the embodiment of the present utility model, according to the sewage transportation direction, the magnetic coagulation sedimentation tank 1, the denitrifying deep bed filter 2, and the activated coke adsorption tower 4 are connected in sequence. Through the scientific setting and combination of each treatment unit, the structure is reasonable and compact, and it has excellent removal effects on pollutants such as TP (Total Phosphorus), TN (Total Nitrogen), SS (Suspended Solids), COD (Chemical Oxygen Demand), and chromaticity in industrial wastewater, can ensure the effluent reaches the standard for discharge, and at the same time has the advantages of stable operation and small floor area.

[0027] The biochemical pretreatment unit pre-treats the sewage through a series of physical, chemical, and biological processes. In some embodiments, the biochemical pretreatment unit generally includes a coarse grid lifting pump house, a fine grid grit chamber, a hydrolysis regulation tank, a biochemical tank, and a secondary sedimentation tank connected in sequence, and the specific process can be adjusted according to the specific sewage quality. The outlet of the secondary sedimentation tank is connected to the inlet of the magnetic coagulation sedimentation tank 1, and the effluent of the secondary sedimentation tank enters the magnetic coagulation sedimentation tank 1. The biochemical pretreatment unit provides better treatment conditions for the subsequent treatment units, which is beneficial to improving the efficiency and effect of the entire sewage treatment system.

[0028] In the embodiment of the present utility model, bypass pipes can be provided between the magnetic coagulation sedimentation tank 1, the denitrifying deep bed filter 2, and the activated coke adsorption tower 4, and whether to bypass the process section can be selected according to the treated water quality, making the system operation more flexible.

[0029] In some embodiments, a lift well 3 is provided between the denitrifying deep bed filter 2 and the activated coke adsorption tower 4, and the lift well 3 lifts the effluent of the denitrifying deep bed filter 2 to the activated coke adsorption tower 4 for further purification treatment.

[0030] In the embodiment of the present utility model, the magnetic coagulation sedimentation tank 1 includes a coagulation tank, a loading tank, a flocculation tank, and a sedimentation tank arranged in sequence. The flocculation tank is used to promote the aggregation and sedimentation of particles. In some embodiments, the magnetic coagulation sedimentation tank 1 further includes a PAC (polyaluminum chloride) dosing device 5. The PAC dosing device 5 is connected to the magnetic coagulation sedimentation tank 1 and is used to add PAC medicament to the coagulation tank of the magnetic coagulation sedimentation tank 1 to enhance the flocculation effect, make the generated flocs denser and stronger, so as to achieve the purpose of high-speed sedimentation.

[0031] The magnetic coagulation sedimentation tank 1 uses magnetic particles to coagulate and sediment suspended substances in water. In some embodiments, the magnetic coagulation sedimentation tank 1 includes a magnetic powder dosing device 7. The magnetic powder dosing device 7 is connected to the magnetic coagulation sedimentation tank 1 and is used to add magnetic powder to the loading tank of the magnetic coagulation sedimentation tank 1. Through the magnetic force, the suspended substances are adsorbed on the surface of the particles to form larger particle clusters, so as to achieve the purpose of coagulation sedimentation.

[0032] The magnetic coagulation sedimentation tank 1 in the embodiment of the present utility model has the advantages of good coagulation effect, fast sedimentation speed, large treatment capacity, low operation cost, etc. Compared with the traditional coagulation sedimentation process, the magnetic coagulation sedimentation technology adds magnetic powder to make pollutants flocculate and combine with the magnetic powder to form denser and stronger flocs, so as to achieve high-speed sedimentation. In addition, the magnetic coagulation sedimentation technology also has many advantages such as fast speed, high efficiency, small floor area, and small investment.

[0033] In some embodiments, the magnetic coagulation sedimentation tank 1 further includes a sludge shearing machine and a magnetic separator. The sludge shearing machine is used to strip the sludge sedimented by the magnetic coagulation sedimentation tank 1, and the magnetic separator is used to recover the magnetic powder in the stripped sludge.

[0034] In some embodiments, the magnetic coagulation sedimentation tank 1 further includes a PAM (polyacrylamide) dosing device 6. The PAM dosing device 6 is connected to the magnetic coagulation sedimentation tank 1 and is used to add PAM medicament to the flocculation tank of the magnetic coagulation sedimentation tank 1.

[0035] In the above embodiment of the present utility model, the residence time of sewage in the magnetic coagulation sedimentation tank 1 is very short, and the magnetic powder and medicament added to the system have strong adsorption effects. Therefore, the removal effects of TP and SS in industrial wastewater are better than those of the traditional process; at the same time, due to its high-speed sedimentation performance, it has many advantages such as fast speed, high efficiency, small floor area, simple structure, convenient maintenance, and low operation cost.

[0036] Integrating the functions of biological denitrification and filtration, using special quartz sand as the film-forming medium for denitrifying organisms, and using the deep bed to remove suspended substances and nitrate nitrogen (NO 3-N). The denitrifying deep bed filter 2 mainly includes a filter media layer, a backwashing device, an inlet and outlet water system, etc. The filter media layer is the core part, usually composed of granular fillers such as sand, quartz sand, coal, etc., which has a large specific surface area and porosity, and can provide a good biological attachment surface and oxygen transfer channel. After the wastewater is pretreated, it enters the filter media layer, and the nitrate nitrogen in it is adsorbed by microorganisms and converted into nitrogen gas. The inlet and outlet water system is responsible for the inlet, outlet and discharge of the wastewater. The backwashing device regularly flushes the filter media with water, performs combined air-water flushing, air flushing, etc. to remove the intercepted solids to ensure the removal effect of the denitrifying deep bed filter.

[0037] In some embodiments, the above system further includes a sodium acetate dosing device 8. The sodium acetate dosing device 8 is connected to the denitrifying deep bed filter 2. The sodium acetate dosing device 8 is used to add sodium acetate to the denitrifying deep bed filter 2 to provide an organic carbon source and promote the denitrification process. The denitrifying deep bed filter 2 combines biological denitrification and physical filtration functions. The filter media in the filter provides a surface for the attachment and growth of denitrifying organisms, and at the same time removes suspended solids through physical filtration. Compared with ordinary facultative ponds, the denitrifying deep bed filter 2 has a small floor area. Through optimized filter media configuration and efficient biological denitrification process, it can achieve the same or even higher treatment efficiency in a smaller space, and can simultaneously play the roles of physically filtering and intercepting suspended solids and biologically denitrifying to remove total nitrogen, with the advantages of high treatment efficiency, convenient use, stability and reliability, etc.

[0038] Activated coke is a carbonaceous material with a special pore structure and surface area. The activated coke adsorption tower 4 is a device based on the adsorption performance of activated coke, mainly used to remove pollutants in liquids. Its working principle is mainly based on the countercurrent principle. The raw water enters from the water distributor or air inlet at the bottom of the adsorption tower, passes through the activated coke layer, and uses the adsorption capacity of activated coke to remove pollutants. Finally, the treated liquid flows out from the top of the adsorption tower, thereby effectively separating the impurities in the liquid.

[0039] In some embodiments, the system further includes a sodium hypochlorite dosing device 9. The sodium hypochlorite dosing device 9 is connected to the inlet of the activated coke adsorption tower 4. The sodium hypochlorite dosing device 9 is used to add sodium hypochlorite to the activated coke adsorption tower 4 to prevent microorganisms from forming a film on the activated coke and affecting the adsorption capacity of the activated coke.

[0040] The activated coke adsorption tower 4 has a good adsorption effect, and has obvious removal effects on pollutants such as COD, chromaticity, and colloid, which can fully guarantee the stability of the effluent; in addition, the activated coke adsorption tower 4 has a compact structure and a small floor area, and is suitable for sewage treatment plants with limited space.

[0041] The combined system for intensive advanced treatment of industrial wastewater in the above embodiments of the present utility model has a wastewater treatment process flow as Figure 2 shown as follows:

[0042] During operation, the effluent treated by the biochemical pretreatment unit enters the magnetic coagulation sedimentation tank 1, which mainly consists of a coagulation tank, a loading tank, a flocculation tank, and a sedimentation tank. PAC medicament is added into the coagulation tank of the magnetic coagulation sedimentation tank 1. After sufficient mixing, it enters the loading tank of the magnetic coagulation sedimentation tank 1. Recycled magnetic powder is added into the loading tank of the magnetic coagulation sedimentation tank 1. After sufficient mixing, it enters the flocculation tank. PAM medicament is added into the flocculation tank to generate larger floc particles, and finally it enters the sedimentation tank for rapid sedimentation separation. The sludge sedimentated in the sedimentation tank, part of it is refluxed to the coagulation tank by the sludge reflux pump for continuous reaction, and the other part is subjected to sludge stripping by the sludge shearing machine and enters the magnetic separator for magnetic powder recovery. The recovered magnetic powder enters the loading tank of the magnetic coagulation sedimentation tank 1 again to continue to participate in the reaction, and the remaining sludge enters the sludge treatment system. During the magnetic flocculation and sedimentation process, SS and TP in the wastewater are removed. The effluent of the magnetic coagulation sedimentation tank 1 enters the denitrifying deep bed filter 2. Using an appropriate amount of carbon source, the denitrifying bacteria attached to the surface of quartz sand convert nitrate nitrogen into nitrogen gas to complete the denitrification reaction process. During the denitrification process, since nitrate nitrogen is continuously reduced to nitrogen gas, a large amount of nitrogen gas will accumulate in the deep bed filter. These gases cause the sewage to flow around between the media, enhancing the contact between microorganisms and water flow, and at the same time improving the filtration efficiency. The effluent of the denitrifying deep bed filter 2 enters the lift well 3, and the wastewater is lifted by the sewage pump in the lift well 3 to the activated coke adsorption tower 4 for treatment. The wastewater enters from the water distributor at the bottom of the adsorption tower and flows upward through the adsorption tower in a countercurrent manner. Pollutants with different molecular weights are adsorbed by the activated coke layer with different pore diameters. The effluent accumulates at the top of the adsorption tower and flows out through the overflow port, thereby further removing COD, chromaticity, turbidity, etc. in the sewage to ensure that all indicators meet the standard requirements.

[0043] In the above embodiments of the present utility model, based on the properties of industrial wastewater, each treatment unit is reasonably set, and has excellent removal effects on pollutants such as TP, TN, SS, COD, chromaticity, etc. in industrial wastewater. The pollutant removal effect is good, which can effectively ensure the effluent reaches the standard for discharge. The treated industrial wastewater can be directly discharged up to the standard. At the same time, it also has the advantages of stable operation, reasonable and compact structure, and small floor area.

[0044] The specific embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present utility model.

Claims

1. An intensive industrial wastewater deep treatment system, characterized in that: It includes a biochemical pretreatment unit, a magnetic coagulation sedimentation tank, a denitrification deep bed filter and an activated coke adsorption tower which are connected in sequence; The water outlet of the biochemical pre-treatment unit is connected to the water inlet of the magnetic coagulation sedimentation tank, and the magnetic coagulation sedimentation tank performs coagulation and sedimentation on the suspended solids and total phosphorus in the biochemical effluent of the biochemical pre-treatment unit; The water inlet of the denitrification deep bed filter is connected to the water outlet of the magnetic coagulation sedimentation tank, and the denitrification deep bed filter performs denitrification and filtration treatment on the effluent of the magnetic coagulation sedimentation tank; The water inlet of the activated coke adsorption tower is connected to the water outlet of the denitrification deep bed filter, and the activated coke adsorption tower further treats the COD and chromaticity pollutants of the effluent of the denitrification deep bed filter.

2. The intensive industrial wastewater deep treatment system according to claim 1 is characterized in that: The biochemical pretreatment unit comprises a coarse screen lifting pump room, a fine screen sand settling tank, a hydrolysis adjustment tank, a biochemical tank and a secondary settling tank which are connected in sequence, and the outlet of the secondary settling tank is connected to the water inlet of the magnetic coagulation sedimentation tank.

3. The intensive industrial wastewater deep treatment system according to claim 1 is characterized in that: A lifting well is provided between the denitrification deep bed filter and the activated coke adsorption tower, and the lifting well lifts the effluent of the denitrification deep bed filter to the activated coke adsorption tower.

4. The intensive industrial wastewater deep treatment system according to claim 1 is characterized in that: The magnetic coagulation sedimentation tank comprises a coagulation tank, a loading tank, a flocculation tank and a sedimentation tank which are arranged in sequence, and the flocculation tank is used to promote the coagulation and sedimentation of particles.

5. The intensive industrial wastewater deep treatment system according to claim 4 is characterized in that: The magnetic coagulation sedimentation tank also includes a PAC dosing device, and the PAC dosing device is used to add PAC reagents to the coagulation tank.

6. The intensive industrial wastewater deep treatment system according to claim 4 is characterized in that: The magnetic coagulation sedimentation tank comprises a magnetic powder dosing device, and the magnetic powder dosing device is used to add magnetic powder to the loading tank.

7. The intensive industrial wastewater deep treatment system according to claim 6 is characterized in that: The magnetic coagulation sedimentation tank also includes a sludge shearing machine and a magnetic separator. The sludge shearing machine is used to peel off the sludge precipitated by the magnetic coagulation sedimentation tank, and the magnetic separator is used to recover the magnetic powder in the stripped sludge.

8. The intensive industrial wastewater deep treatment system according to claim 4 is characterized in that: The magnetic coagulation sedimentation tank also includes a PAM dosing device, and the PAM dosing device is used to add PAM reagent to the flocculation tank.

9. The intensive industrial wastewater deep treatment system according to claim 1 is characterized in that: The system further comprises a sodium acetate dosing device, which is connected to the denitrification deep bed filter and is used for adding sodium acetate to the denitrification deep bed filter.

10. The intensive industrial wastewater deep treatment system according to claim 1, characterized in that: The system also includes a sodium hypochlorite dosing device, which is connected to the inlet of the activated coke adsorption tower and is used to add sodium hypochlorite to the activated coke adsorption tower.

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