CN204689833U - A laboratory wastewater treatment system - Google Patents

Abstract

The utility model discloses a laboratory effluent disposal system, including inorganic waste water treatment unit and organic waste water treatment unit, inorganic waste water treatment unit includes the catch basin, adjusts coagulating basin, sedimentation tank, super filtering pond, electrolytic bath and the electrodialysis pond that connect gradually through the pipeline, organic waste water treatment unit includes the catch basin, adjusts coagulating basin, sedimentation tank and the MBR pond that connect gradually through the pipeline, and inorganic waste water treatment unit and organic waste water treatment unit share the catch basin, adjust coagulating basin, the sedimentation tank that connect gradually through pipeline and pump. The utility model discloses a laboratory wastewater treatment system operation flexible operation just can realize the processing of inorganic waste water and the processing of organic waste water respectively through simple regulation.

Description

A laboratory wastewater treatment system

technical field

The utility model relates to a waste water treatment device, in particular to a laboratory waste water treatment system.

Background technique

The laboratory wastewater mainly comes from the experimental laboratories of various scientific research units and the scientific research and teaching laboratories of colleges and universities. Laboratory wastewater has its own special characteristics: small amount, strong discontinuity, high hazard and complex and changeable composition.

According to the types of main pollutants contained in wastewater, laboratory wastewater can be divided into two categories: laboratory inorganic wastewater and organic wastewater. Inorganic wastewater mainly contains heavy metals, heavy metal complexes, acids and bases, cyanides, sulfides, halogen ions and other inorganic ions; organic wastewater contains commonly used organic solvents, organic acids, ethers, polychlorinated biphenyls, organic phosphorus Compounds, phenols, petroleum, oily substances. In contrast, organic wastewater has a wider range of pollution than inorganic wastewater, and the harm it brings is more serious. Different waste water has different treatment methods and degrees due to the different composition of pollutants. The direct discharge of laboratory wastewater will inevitably pollute people's domestic water and living environment. Therefore, it is urgent to find an economical, efficient, energy-saving, environmentally friendly and applicable laboratory wastewater treatment process.

Chinese patent document CN 103739149 (application number 201310568639.5) discloses a laboratory wastewater treatment process, including sewage treatment and sludge treatment, wherein during sewage treatment, laboratory wastewater enters artificial grids to filter out impurities, and then enters a regulating tank to regulate A submersible mixing pump is installed in the pool to homogenize the laboratory wastewater by stirring, then lift the sewage into the neutralization sedimentator through the lifting pump, add acid or alkali to adjust the pH value, add flocculant to coagulate and precipitate to remove heavy metal ions, and mix The effluent after coagulation and sedimentation enters the SBR tank, and the effluent from the SBR tank is discharged up to the standard from the drainage tank, and the filtrate is returned to the regulating tank. The above sewage treatment method adopts the SBR process, because of the operating characteristics of the SBR process, the solid-liquid separation is not sufficient, and the process cannot recover valuable metals.

Chinese patent document CN 104496087 A (application number 201410680728.3) discloses a laboratory wastewater treatment system, including a pretreatment unit, an acid-base adjustment unit, a centralized reaction unit, a precipitation separation unit, and a deep purification unit; the pretreatment unit is a micro-electrolysis unit , used to pretreat the waste water that needs to be filtered, the acid-base adjustment unit is used to process the waste water according to the properties of the pre-treatment unit, and add reactive substances to the waste water for reaction, after the acid-base adjustment unit in the centralized reaction unit is processed The wastewater is reacted in it; the wastewater after the reaction in the centralized reaction unit is precipitated in the precipitation separation unit, and the deep purification unit is used to further filter the wastewater to remove impurities in the wastewater. The above-mentioned laboratory wastewater treatment system is suitable for treating inorganic wastewater in laboratories, but not for organic wastewater in laboratories.

Utility model content

The technical problem to be solved by the utility model is to provide a laboratory wastewater treatment system which is simple in conversion and can treat laboratory inorganic wastewater and organic wastewater.

The technical solution for realizing the purpose of this utility model is a laboratory wastewater treatment system, including an inorganic wastewater treatment unit and an organic wastewater treatment unit, and the inorganic wastewater treatment unit includes a sump, an adjustment coagulation tank, and a sedimentation tank connected in sequence by pipelines , an ultrafiltration tank, an electrolytic tank and an electrodialysis tank, the organic wastewater treatment unit includes a sump, a regulating coagulation tank, a sedimentation tank and an MBR tank connected in sequence by pipelines, and the inorganic wastewater treatment unit and the organic wastewater treatment unit share the pipeline The sump, the regulating coagulation tank and the sedimentation tank connected in sequence with the pump.

Above the regulating coagulation tank, there are feeding ports, acid tanks and lye tanks, and the feeding ports are used to add flocculants; the liquid outlet of the acid tank is connected to the inner cavity of the regulating coagulation tank through pipelines and solenoid valves The acid is stored in the acid tank; the liquid outlet of the lye tank is connected with the inner cavity of the regulating coagulation tank through a pipeline and a solenoid valve, and the lye is stored in the lye tank.

The adjusting coagulation tank is also equipped with a pH real-time monitor, the detection end of the monitor is immersed in the liquid in the adjusting coagulation tank, and the data display part of the monitor is located outside the adjusting coagulation tank.

The pipeline between the sump and the regulating coagulation tank is provided with a first water pump, the water inlet of the first water pump communicates with the lower end liquid outlet of the sump through the pipeline, and the water outlet of the first water pump communicates with the regulating coagulation tank through the pipeline. The upper end of the liquid inlet is connected; the pipeline between the adjustment coagulation tank and the sedimentation tank is provided with a second water pump, and the water inlet of the second water pump is connected with the lower end liquid outlet of the adjustment coagulation tank through the pipeline, and the outlet of the second water pump The water port communicates with the liquid inlet at the upper end of the sedimentation tank through a pipe.

A submerged curtain membrane is provided in the ultrafiltration tank, and a liquid level control position is provided in the ultrafiltration tank; a third water pump is arranged on the pipeline between the sedimentation tank and the ultrafiltration tank, and the water inlet of the third water pump passes through The pipeline communicates with the liquid outlet at the lower end of the sedimentation tank, and the water outlet of the third water pump communicates with the liquid inlet at the upper end of the ultrafiltration tank through the pipeline.

The pipeline between the water outlet of the third water pump and the upper liquid inlet of the ultrafiltration tank includes a main pipeline and a first branch pipeline, and a valve is arranged on the first branch pipeline.

The membrane used in the MBR tank of the organic wastewater treatment unit is a submerged curtain membrane, and the MBR tank is provided with a liquid level control position.

The pipeline between the sedimentation tank and the MBR tank is provided with a third water pump, the water inlet of the third water pump is connected with the liquid outlet at the lower end of the sedimentation tank through the pipeline, and the water outlet of the third water pump is connected with the liquid inlet of the MBR tank through the pipeline ; The liquid level control bit set in the MBR pool controls the third water pump.

The pipeline between the water outlet of the third water pump and the upper liquid inlet of the MBR pool includes a main pipeline and a second branch pipeline, and a valve is arranged on the second branch pipeline.

The above-mentioned main pipeline is connected with the first branch pipeline and the second branch pipeline through a tee.

The utility model has positive effects: the laboratory wastewater treatment system of the utility model operates flexibly, and the treatment of inorganic wastewater and organic wastewater can be respectively realized through simple adjustment; when the wastewater to be treated is organic wastewater, the wastewater After adjusting the coagulation tank and sedimentation tank, it enters the MBR tank for treatment and then discharges it; when the wastewater to be treated is inorganic wastewater, the wastewater passes through the adjustment coagulation tank and sedimentation tank, and then goes through ultrafiltration, electrolysis tank and electrodialysis tank to complete the treatment Reach the discharge standard; after the inorganic wastewater and organic wastewater are pretreated by adjusting the coagulation tank and the sedimentation tank, the treatment channel used for further treatment can be easily switched. When the inorganic wastewater is treated, the valve of the organic wastewater treatment channel is closed. The waste water treatment channel valve is enough.

Description of drawings

Fig. 1 is the structural block diagram of laboratory waste water treatment system of the present utility model;

The marks in the above drawings are as follows: the first water pump 1 , the second water pump 2 and the third water pump 3 .

Detailed ways

(Example 1)

Referring to Fig. 1, the laboratory wastewater treatment system of this embodiment includes an inorganic wastewater treatment unit and an organic wastewater treatment unit.

The inorganic wastewater treatment unit includes a sump tank, a regulating coagulation tank, a sedimentation tank, an ultrafiltration tank, an electrolytic tank and an electrodialysis tank which are sequentially connected by pipelines.

The sump is used to collect mixed laboratory wastewater.

The top of the adjusting coagulation tank is provided with a feeding port, an acid tank and a lye tank, and the feeding port is used for adding flocculants. The liquid outlet of the acid tank is communicated with the inner cavity of the adjustment coagulation tank through the pipeline and the electromagnetic valve, and the acid is stored in the acid tank, which is 10% hydrochloric acid in the present embodiment; the liquid outlet of the alkali tank is connected through the pipeline and The electromagnetic valve is connected with the inner cavity of the adjustment coagulation tank, and the lye is stored in the lye tank, which is 10% sodium hydroxide in the present embodiment.

The adjusting coagulation tank is also equipped with a pH real-time monitor, the detection end of the monitor is immersed in the liquid in the adjusting coagulation tank, and the data display part of the monitor is located outside the adjusting coagulation tank.

The pipeline between the sump and the regulating coagulation pond is provided with a first water pump 1, the water inlet of the first water pump 1 communicates with the liquid outlet at the lower end of the sump through the pipeline, and the water outlet of the first water pump 1 communicates with the regulating coagulation through the pipeline. The liquid inlet at the upper end of the pool is connected.

The sedimentation tank is used for static sedimentation of waste water, with a sludge outlet at the bottom.

The pipeline between the adjusting coagulation tank and the sedimentation tank is provided with a second water pump 2, the water inlet of the second water pump 2 is connected with the lower end liquid outlet of the adjusting coagulation tank through the pipeline, and the water outlet of the second water pump 2 is connected with the sedimentation tank through the pipeline. The liquid inlet at the upper end of the pool is connected.

A submerged curtain membrane is provided in the ultrafiltration tank, and a liquid level control position is provided in the ultrafiltration tank.

The pipeline between the sedimentation tank and the ultrafiltration tank is provided with a third water pump 3, the water inlet of the third water pump 3 is connected with the lower end liquid outlet of the sedimentation tank through the pipeline, and the water outlet of the third water pump 3 is connected with the ultrafiltration tank through the pipeline. The upper liquid inlet is connected. The liquid level control position set in the ultrafiltration tank controls the third water pump 3, and when the liquid level in the pool drops to a set value, the third water pump 3 is turned on to transport the water in the sedimentation tank to the ultrafiltration tank.

The pipeline between the water outlet of the third water pump 3 and the upper liquid inlet of the ultrafiltration tank includes a main pipeline and a first branch pipeline, and a valve is arranged on the first branch pipeline.

The electrodes in the electrolytic cell are suspended type, stainless steel electrodes are used, and the power supply used is a DC stabilized power supply.

The electrodialysis cell is a two-stage two-stage type, in which the ion exchange membrane adopts a heterogeneous membrane, and the separator material is polyvinyl chloride; the electrode material used is graphite impregnated with paraffin wax, and the treatment capacity is 100L/h. The rate can reach more than 90%. A concentrated water return pipeline is provided between the electrodialysis cell and the electrolytic cell for returning the concentrated water in the electrodialysis cell to the electrolytic cell.

The organic wastewater treatment unit includes a sump tank, a regulating coagulation tank, a sedimentation tank and an MBR tank which are sequentially connected by pipelines.

The sump of the organic wastewater treatment unit is the same as that of the inorganic wastewater treatment unit, the regulating coagulation pond of the organic wastewater treatment unit is the same as the regulating coagulation pond of the inorganic wastewater treatment unit, and the sedimentation pond of the organic wastewater treatment unit is the same as that of the inorganic wastewater treatment unit The sedimentation tank is the same. Correspondingly, a first water pump 1 is provided on the pipeline between the sump of the organic wastewater treatment unit and the regulating coagulation tank, and a second water pump 2 is provided on the pipeline between the regulating coagulation tank and the sedimentation tank, that is, the inorganic wastewater treatment unit and the The organic wastewater treatment unit shares a sump, a regulating coagulation tank, and a sedimentation tank that are sequentially connected through pipelines and pumps.

The membrane used in the MBR tank of the organic wastewater treatment unit is a submerged curtain membrane, and the MBR tank is equipped with a liquid level control position.

The pipeline between the sedimentation tank and the MBR tank is provided with a third water pump 3, the water inlet of the third water pump 3 communicates with the liquid outlet at the lower end of the sedimentation tank through the pipeline, and the water outlet of the third water pump 3 communicates with the liquid inlet of the MBR tank through the pipeline The mouth is connected. The liquid level control set in the MBR pool controls the third water pump 3, and when the liquid level in the pool drops to the set value, the third water pump 3 is turned on to transport the water in the sedimentation tank to the MBR pool.

The pipeline between the water outlet of the third water pump 3 and the upper liquid inlet of the MBR tank includes a main pipeline and a second branch pipeline, and a valve is arranged on the second branch pipeline. The main pipeline is connected with the first branch pipeline and the second branch pipeline through a tee.

(Application example 1)

In this application example, the wastewater treatment system described in Example 1 is used to treat about 500 L of copper-containing wastewater discharged from a laboratory, and the indicators are: pH = 1.5, Cu ²⁺ = 110 mg/L.

The process is as follows:

The copper-containing wastewater is collected and mixed in the sump, and the mixed wastewater is transported by the first water pump 1 into the adjusting flocculation tank, and according to the pH value of the wastewater, lye is added to the adjusting flocculation tank, and the pH of the wastewater is adjusted to weak alkaline ( In this embodiment, it is 8-8.5), and 10% polyaluminum ferric sulfate is added as a flocculant from the upper feed port of the regulating flocculation tank for coagulation treatment. After 20 minutes, turn on the second water pump 2 to transport the wastewater from the regulating flocculation tank into the sedimentation tank, and collect the sludge at the bottom of the sedimentation tank; at this time, close the valve leading to the pipeline of the MBR tank and open the valve leading to the pipeline of the ultrafiltration tank , the sedimented waste water is transported into the ultrafiltration tank by the third water pump 3, the collected fresh water is discharged out, the concentrated water flowing out from the ultrafiltration tank enters the electrolytic tank, and heavy metals such as copper and silver are electrolytically removed, and the concentrated water flowing out of the electrolytic tank is The water enters the electrodialysis cell; the fresh water obtained from the electrodialysis cell is discharged, and the concentrated water obtained is returned to the electrolysis cell to collect heavy metals by electrolysis again. After the treatment, the pH value of the fresh water flowing out from the electrodialysis cell was detected to be 7.4, Cu ²⁺ =0.001mg/L, and about 55g of copper was collected.

(Application example 2)

In this application example, the wastewater treatment system described in Example 1 is used to treat about 2000 L of nickel-containing wastewater discharged from a laboratory, and the indicators are: pH = 2.3, Ni ²⁺ = 340 mg/L.

The treatment method is the same as that of Application Example 1. After the treatment, the pH value of the fresh water flowing out from the electrodialysis tank is detected to be 8.5, Ni ²⁺ =0.0012mg/L, and about 650g of nickel is collected.

(Application example 3)

This application example uses the wastewater treatment system described in Example 1 to treat about 800 L of low-concentration organic wastewater discharged from a laboratory, the pH of the wastewater is 4.7, COD = 450 mg/L, BOD = 150 mg/L, SS = 280 mg /L.

The process is as follows:

The low-concentration organic wastewater is collected and mixed in the sump, and the mixed wastewater is transported by the first water pump 1 into the regulating flocculation pond. According to the pH value of the waste water, lye is added to the regulating flocculation pond, and the pH of the waste water is adjusted to be weakly acidic ( In this embodiment, it is 6.5-6.9), and the flocculant 10% polyaluminum ferric sulfate is added from the upper feed port of the regulating flocculation tank for coagulation treatment. After 20 minutes, turn on the second water pump 2 to transport the waste water from the regulating flocculation tank into the sedimentation tank, and collect the sludge at the bottom of the sedimentation tank; at this time, open the valve leading to the pipeline of the MBR tank, and close the valve leading to the pipeline of the ultrafiltration tank , the settled wastewater is transported by the third water pump 3 into the MBR tank for treatment, and the treated fresh water is discharged to complete the treatment of low-concentration organic wastewater. After the treatment is completed, the pH of fresh water is detected to be pH=6.8, COD ≤40mg/L, BOD ≤15mg/L, SS ≤15mg/L.

Claims (6)

1. a Laboratory Waste Water Treatment system, it is characterized in that: comprise inorganic wastewater processing unit and treatment of Organic Wastewater unit, described inorganic wastewater processing unit comprise connected successively by pipeline water collecting basin, regulate coagulation basin, settling tank, ultrafiltration pond, electrolyzer and electrodialytic cell, described treatment of Organic Wastewater unit comprise connected successively by pipeline water collecting basin, regulate coagulation basin, settling tank and MBR pond, the water collecting basin that inorganic wastewater processing unit is connected by pipeline and pump successively with treatment of Organic Wastewater units shared, regulate coagulation basin, settling tank.

2. Laboratory Waste Water Treatment system according to claim 1, is characterized in that: regulate the top of coagulation basin to be provided with dog-house, acid solution tank and alkali liquid tank, dog-house is used for adding flocculation agent; The liquid outlet of acid solution tank, by the intracavity inter-connection of pipeline and magnetic valve and adjustment coagulation basin, stores acid in acid solution tank; The liquid outlet of alkali liquid tank, by the intracavity inter-connection of pipeline and magnetic valve and adjustment coagulation basin, stores alkali lye in alkali liquid tank;

Regulate coagulation basin to be also provided with pH real-time monitor, the detection termination of monitor is immersed in and regulates in coagulation basin in liquid, and the data presentation portion of monitor is positioned at and regulates coagulation basin outside.

3. Laboratory Waste Water Treatment system according to claim 2, it is characterized in that: the pipeline between water collecting basin and adjustment coagulation basin is provided with the first water pump (1), the water-in of the first water pump (1) is communicated with the lower end liquid outlet of water collecting basin by pipeline, and the water outlet of the first water pump (1) is connected with regulating the upper end fluid inlet of coagulation basin by pipeline; The pipeline between coagulation basin and settling tank is regulated to be provided with the second water pump (2), the water-in of the second water pump (2) is communicated with regulating the lower end liquid outlet of coagulation basin by pipeline, and the water outlet of the second water pump (2) is connected with the upper end fluid inlet of settling tank by pipeline.

4. Laboratory Waste Water Treatment system according to claim 3, is characterized in that: be provided with immersion curtain type membrane in ultrafiltration pond, and is provided with Liquid level position in ultrafiltration pond; Pipeline between settling tank and ultrafiltration pond is provided with the 3rd water pump (3), and the water-in of the 3rd water pump (3) is communicated with the lower end liquid outlet of settling tank by pipeline, and the water outlet of the 3rd water pump (3) is connected with the upper end fluid inlet in ultrafiltration pond by pipeline;

Pipeline between the water outlet of the 3rd water pump (3) and the upper end fluid inlet in ultrafiltration pond comprises main pipeline and the first small transfer line, and the first small transfer line is provided with valve.

5. Laboratory Waste Water Treatment system according to claim 3, is characterized in that: the MBR pond film used for the treatment of of Organic Wastewater unit is immersion curtain type membrane, and MBR pond is provided with Liquid level position;

Pipeline between settling tank and MBR pond is provided with the 3rd water pump (3), and the water-in of the 3rd water pump (3) is communicated with the lower end liquid outlet of settling tank by pipeline, and the water outlet of the 3rd water pump (3) is connected by the fluid inlet of pipeline with MBR pond; The Liquid level position arranged in MBR pond controls the 3rd water pump (3);

Pipeline between the water outlet of the 3rd water pump (3) and the upper end fluid inlet in MBR pond comprises main pipeline and the second small transfer line, and the second small transfer line is provided with valve.

6. the Laboratory Waste Water Treatment system according to claim 4 or 5, is characterized in that: described main pipeline is connected by a threeway with the first small transfer line, the second small transfer line.