Aluminum lithium alloy casting wastewater treatment system

Abstract

The utility model provides an aluminum-lithium alloy casting wastewater treatment system which comprises an oily wastewater regulating tank, an efficient shallow air flotation machine, an inclined plate sedimentation tank, a middle water tank, a quartz sand filter, an activated carbon filter, a precision filter, an ultrafiltration device and a produced water collecting tank which are communicated in sequence, the chemical backwashing water tank, the high-efficiency shallow air flotation machine and the inclined plate sedimentation tank are respectively communicated with the sludge tank; the chemical backwashing water tank is respectively communicated with backwashing water inlets of the quartz sand filter, the activated carbon filter, the precision filter and the ultrafiltration device; cleaning water outlets of the quartz sand filter, the activated carbon filter, the precision filter and the ultrafiltration device are respectively communicated with the oily wastewater adjusting tank, a concentrated water outlet of the ultrafiltration device is communicated with the oily wastewater adjusting tank, and a produced water outlet of the produced water collecting tank is communicated with a water inlet of the chemical backwashing water tank. The aluminum lithium alloy casting wastewater treatment system disclosed by the utility model can meet the direct discharge standard, and the wastewater can be recycled, so that the system is more sustainable and economical.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to an aluminum-lithium alloy casting wastewater treatment system. Background Art

[0002] During the casting process of aluminum-lithium alloy, die-casting release agents are used, and cleaning agents are used when cleaning castings. For some aluminum-lithium alloys composed of oily heavy metals, trace metals and phosphorus elements will be incorporated into the washing wastewater during grinding and washing. There is also dust in the die-casting process, and lubricants on the casting machinery leak into the wastewater pool, which makes the water quality of aluminum-lithium alloy casting wastewater contain high concentrations of oil, COD, and suspended solids. It cannot be directly discharged to pollute the environment. Wastewater treatment must be carried out before discharge, and the treatment is difficult. The existing casting wastewater treatment system does not consider the recyclability of the treated wastewater, so it is necessary to propose a new, more sustainable and economical aluminum-lithium alloy casting wastewater treatment system. Utility Model Content

[0003] The purpose of the utility model is to solve the deficiencies of the prior art and provide an aluminum-lithium alloy casting wastewater treatment system that can meet direct discharge standards and can reuse wastewater.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] The utility model provides an aluminum-lithium alloy casting wastewater treatment system, comprising an oily wastewater regulating tank, a high-efficiency shallow air flotation machine, an inclined plate sedimentation tank, an intermediate water tank, a quartz sand filter, an activated carbon filter, a precision filter, an ultrafiltration device, a produced water collection tank, and a chemical backwash water tank respectively connected to the backwash water inlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device, the high-efficiency shallow air flotation machine and the inclined plate sedimentation tank are respectively connected to a sludge tank, the cleaning water outlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device are respectively connected to the oily wastewater regulating tank, the concentrated water outlet of the ultrafiltration device is connected to the oily wastewater regulating tank, and the produced water outlet of the produced water collection tank is connected to the water inlet of the chemical backwash water tank.

[0006] In one embodiment, it also includes a coagulation tank, a neutralization tank and a flocculation tank. The high-efficiency shallow air flotation machine, the coagulation tank, the neutralization tank, the flocculation tank and the inclined plate sedimentation tank are connected in sequence. Adding a coagulation tank, a neutralization tank and a flocculation tank helps to further remove suspended matter and organic matter in the wastewater.

[0007] In one embodiment, the high-efficiency shallow flotation machine is provided with a dosing device for adding demulsifiers, PAC, and PAM, the coagulation tank is provided with a dosing device for adding PFS, the neutralization tank is provided with a dosing device for adding NaOH, and the flocculation tank is provided with a dosing device for adding PAM.

[0008] In one embodiment, the precision filter is a multi-core filter with a filtration pore size of 1 μm.

[0009] In one embodiment, the membrane of the ultrafiltration device is a tubular hollow fiber membrane, and the membrane filtration pore size is 0.1 μm.

[0010] In one embodiment, the sludge tank is connected to a plate and frame sludge dewatering device.

[0011] In one embodiment, the produced water outlet of the produced water collection tank is connected to a reuse workshop through a pipeline.

[0012] In one embodiment, the tank volumes of the high-efficiency shallow air flotation machine, the coagulation tank, and the neutralization tank are designed based on a reaction residence time greater than 30 minutes.

[0013] In one embodiment, the volume of the inclined plate sedimentation tank is designed according to a reaction residence time greater than 2 hours.

[0014] In one embodiment, the chemical backwash water tank is provided with dosing ports for sodium hypochlorite, sodium hydroxide and hydrochloric acid, and a cleaning booster pump is installed at the water outlet of the chemical backwash water tank. The outlet pipe of the cleaning booster pump is respectively connected to the backwash pipes of the quartz sand filter, the activated carbon filter, the precision filter and the ultrafiltration device, and each backwash pipe is installed with a valve that can control the individual cleaning of the filter.

[0015] Compared with the prior art, the utility model has the beneficial effect that, by utilizing flotation equipment, a coagulation tank, a neutralization tank, a sedimentation tank, and a filter equipment, the casting wastewater can be effectively purified repeatedly through the design of coagulation flotation, coagulation sedimentation, membrane filtration, and sludge dehydration and external disposal, and the pollutants in the aluminum-lithium alloy casting wastewater can be effectively treated. The wastewater treated by the system can meet the discharge standards, and the water inlet of the chemical backwashing water tank is connected with the water outlet of the water collection tank, and the water outlet of the chemical backwashing water tank is respectively connected with the backwashing water inlet of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device, and the cleaning water outlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device are respectively connected with the oily wastewater regulating tank, thereby realizing the recycling of the treated wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of an embodiment of an aluminum-lithium alloy casting wastewater treatment system of the utility model. DETAILED DESCRIPTION

[0017] like Figure 1 As shown, this embodiment provides an aluminum-lithium alloy casting wastewater treatment system, including an oily wastewater regulating tank, a high-efficiency shallow air flotation machine, a coagulation tank, a neutralization tank, a flocculation tank, an inclined plate sedimentation tank, an intermediate water tank, a quartz sand filter, an activated carbon filter, a precision filter, an ultrafiltration device, a produced water collection tank, and a chemical backwashing water tank connected to the backwashing water inlet of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device respectively. The water outlet of the chemical backwashing water tank is connected to the quartz sand filter, the activated carbon filter, the precision filter, and the backwashing device of the ultrafiltration device through pipelines. The washing water outlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device are respectively connected to the oily wastewater regulating tank, the concentrated water outlet of the ultrafiltration device is connected to the oily wastewater regulating tank, and the produced water outlet of the produced water collection tank is connected to the water inlet of the chemical backwashing water tank. At the same time, the produced water outlet of the produced water collection tank is also connected to the workshop reuse and external discharge through a pipeline.

[0018] In this embodiment, the high-efficiency shallow air flotation machine and the inclined plate sedimentation tank are respectively connected to the sludge tank, and the sludge tank is connected to the plate and frame sludge dewatering equipment. The high-efficiency shallow air flotation machine is a machine that uses small bubbles or micro bubbles to make impurities in the medium float to the surface. The high-efficiency shallow air flotation machine is provided with a dosing device for adding demulsifiers, PAC, and PAM, the coagulation tank is provided with a dosing device for adding PFS, the neutralization tank is provided with a dosing device for adding NaOH, and the flocculation tank is provided with a dosing device for adding PAM. The tank volume of the high-efficiency shallow air flotation machine, the coagulation tank, and the neutralization tank is designed to have a reaction residence time greater than 30 minutes. The tank volume of the inclined plate sedimentation tank is designed to have a reaction residence time greater than 2 hours.

[0019] In this embodiment, the precision filter is a multi-core filter with a filtration pore size of 1 μm. The membrane of the ultrafiltration device is a tubular hollow fiber membrane with a membrane filtration pore size of 0.1 μm.

[0020] In this embodiment, the operation process of the aluminum-lithium alloy casting wastewater treatment system is as follows: the wastewater in the oily wastewater regulating tank is pumped into the high-efficiency shallow flotation machine through a lifting pump, liquid alkali / hydrochloric acid is added to adjust the pH value of the wastewater to 6-9, demulsifier, PAC (polyaluminum chloride), and PAM (polyacrylamide) are added for demulsification and coagulation reaction, and then the emulsified oil and colloid formed in the wastewater are brought to the surface by the fine bubbles generated by flotation, and finally the floating sludge is collected by a scraper into the sludge discharge pipe and flows into the sludge pool by gravity, and the clarified water inside the high-efficiency shallow flotation machine flows into the bottom of the coagulation tank through the pipe.

[0021] PFS (polyferric sulfate) is added to the coagulation tank for coagulation and stirring reaction. The coagulated wastewater flows into the bottom of the neutralization tank through the pipeline. NaOH is added to the neutralization tank to adjust the pH value to 6-7. The effluent from the neutralization tank flows into the flocculation tank through the pipeline. PAM is added to the flocculation tank to adsorb small flocs of pollutants in the wastewater into large flocs. The effluent from the flocculation tank flows into the middle of the inclined plate sedimentation tank through the pipeline. After sedimentation in the inclined plate sedimentation tank, the sludge at the bottom is discharged into the sludge tank by gravity through the pipeline, and the supernatant from the inclined plate sedimentation tank flows into the middle water tank through the pipeline.

[0022] The wastewater from the intermediate water pool is sent to the quartz sand filter through a booster pump to intercept large molecular solid particles and colloids in the water; the effluent from the quartz sand filter enters the activated carbon filter to adsorb small molecular organic matter, odor, pigments, and heavy metal ions in the water; the effluent from the activated carbon filter enters the precision filter to intercept suspended solids larger than 1μm; the effluent from the precision filter is sent to the ultrafiltration device through a booster pump. The membrane filtration pore size of the ultrafiltration device is 0.1μm, which filters out harmful substances such as bacteria and colloids in the wastewater and retains trace elements and minerals in the water. The clean water after ultrafiltration treatment flows by gravity into the water collection pool, and the clean water in the water collection pool is pumped back to the workshop for reuse or discharge. The concentrated water produced by ultrafiltration flows by gravity into the oily wastewater regulating tank through a pipeline for re-treatment.

[0023] Part of the clean water in the water collection pool flows into the chemical backwash water tank through the pipeline valve control. The chemical backwash water tank is equipped with sodium hypochlorite, sodium hydroxide, and hydrochloric acid dosing ports. The outlet of the chemical backwash water tank is equipped with a cleaning booster pump. The outlet pipe of the cleaning booster pump is connected to the backwash pipes of the quartz sand filter, activated carbon filter, precision filter, and ultrafiltration device respectively. Valves are installed on each backwash pipe to control the cleaning of each filter separately. The cleaning water flows into the oily wastewater regulating tank through the pipeline for reprocessing. The backwash cycle of the quartz sand filter, activated carbon filter, and precision filter is once every 12 hours, and the backwash cycle of the ultrafiltration device is once every 4 hours.

[0024] The aluminum-lithium alloy casting wastewater treatment system of the utility model utilizes flotation equipment, a coagulation tank, a neutralization tank, a sedimentation tank, and a filter equipment, and realizes repeated effective purification of casting wastewater through the design of coagulation flotation, coagulation sedimentation, membrane filtration, and sludge dehydration and external transportation disposal, and can effectively treat pollutants in the aluminum-lithium alloy casting wastewater. The wastewater treated by the system can meet the discharge standard, and the water inlet of the chemical backwashing water tank is connected with the water outlet of the water production collection tank, the water outlet of the chemical backwashing water tank is respectively connected with the backwashing water inlet of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device, and the cleaning water outlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device are respectively connected with the oil-containing wastewater regulating tank, thereby realizing the recycling of the treated wastewater.

[0025] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0026] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An aluminum-lithium alloy casting wastewater treatment system, characterized in that: It includes an oily wastewater regulating tank, a high-efficiency shallow air flotation machine, an inclined plate sedimentation tank, an intermediate water tank, a quartz sand filter, an activated carbon filter, a precision filter, an ultrafiltration device, a produced water collection tank, and a chemical backwash water tank respectively connected to the backwash water inlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device. The high-efficiency shallow air flotation machine and the inclined plate sedimentation tank are respectively connected to the sludge tank, the cleaning water outlets of the quartz sand filter, the activated carbon filter, the precision filter, and the ultrafiltration device are respectively connected to the oily wastewater regulating tank, the concentrated water outlet of the ultrafiltration device is connected to the oily wastewater regulating tank, and the produced water outlet of the produced water collection tank is connected to the water inlet of the chemical backwash water tank.

2. The aluminum-lithium alloy casting wastewater treatment system according to claim 1, characterized in that: It also includes a coagulation tank, a neutralization tank and a flocculation tank. The high-efficiency shallow air flotation machine, the coagulation tank, the neutralization tank, the flocculation tank and the inclined plate sedimentation tank are connected in sequence.

3. The aluminum-lithium alloy casting wastewater treatment system according to claim 2, characterized in that: The high-efficiency shallow flotation machine is provided with a dosing device for adding demulsifier, PAC, and PAM, the coagulation tank is provided with a dosing device for adding PFS, the neutralization tank is provided with a dosing device for adding NaOH, and the flocculation tank is provided with a dosing device for adding PAM.

4. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The precision filter is a multi-core filter with a filter pore size of 1 μm.

5. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The membrane of the ultrafiltration device is a tubular hollow fiber membrane, and the membrane filtration pore size is 0.1 μm.

6. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The sludge pool is connected to the plate and frame sludge dewatering equipment.

7. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The produced water outlet of the produced water collection tank is connected to the recycling workshop through a pipeline.

8. The aluminum-lithium alloy casting wastewater treatment system according to claim 2, characterized in that: The tank volumes of the high-efficiency shallow air flotation machine, the coagulation tank, and the neutralization tank are designed based on a reaction residence time of more than 30 minutes.

9. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The volume of the inclined plate sedimentation tank is designed based on a reaction residence time of more than 2 hours.

10. The aluminum-lithium alloy casting wastewater treatment system according to claim 1 or 2, characterized in that: The chemical backwash water tank is provided with dosing ports for sodium hypochlorite, sodium hydroxide and hydrochloric acid, and a cleaning booster pump is installed at the water outlet of the chemical backwash water tank. The outlet pipe of the cleaning booster pump is respectively connected to the backwash pipes of the quartz sand filter, the activated carbon filter, the precision filter and the ultrafiltration device, and each backwash pipe is installed with a valve that can control the individual cleaning of the filter.

Images