Device for treating mercury-containing organic wastewater in Tibetan medicine processing process

Abstract

The utility model provides a mercury-containing organic wastewater treatment device in a Tibetan medicine processing process. The mercury-containing organic wastewater treatment device comprises a raw water tank, a micro-filtration membrane treatment unit, an electro-catalysis pretreatment unit, a mercury capturing and separating unit and a high-precision filtering unit which are sequentially connected, and the electro-catalysis pretreatment unit is further connected with a comprehensive waste gas purification unit; the mercury capture and separation unit comprises a chalcogenide reaction tank, a PAM reaction tank and a clarification tank which are communicated in sequence; the chalcogenide reaction tank is connected with a chalcogenide dosing device; and the PAM reaction tank is connected with a PAM dosing device. According to the utility model, the processes of filtration, electro-catalysis pretreatment, heavy metal capture, targeted adsorption and solid-liquid separation are adopted to treat a large amount of high-mercury, high-chromaticity, high-suspended-matter and high-COD wastewater generated in the Tibetan medicine zogtai processing process, so that the organic matter content of a water sample can be greatly reduced, the chromaticity of water is reduced, the suspended matter in water is removed, and the mercury concentration in water is reduced.

Description

Technical Field

[0001] The utility model relates to the field of treating wastewater from the processing of Tibetan medicine, and particularly relates to a device for treating mercury-containing organic wastewater in the process of processing Tibetan medicine. Background Art

[0002] There are mainly three major methods for the processing of Zowa, namely, the method of removing dirt (rinsing) and detoxifying, the method of refining and detoxifying, and the method of pairing. However, during the processing of Tibetan medicine Zowa, wastewater with high mercury content, high chromaticity, high suspended solids and high COD will be generated.

[0003] The main raw materials for the refining of "Zowa" are mercury and sulfur, which contain more than 30 elements. Except for C, H, and O, the content of mercury sulfide and elemental sulfur is greater than 90%. The main component in the wastewater is β-mercury sulfide. During the processing of Tibetan medicine Zowa, a large amount of total mercury will be released into the environment and enter the human body through various channels (steam & dust), passing through the digestive tract and respiratory mucosa, etc. During the processing, a certain amount of wastewater with high mercury content, high chromaticity, high suspended solids and high COD will also be generated.

[0004] The high-concentration organic wastewater generated from the processing of Tibetan medicine urgently needs to be solved.

[0005] Due to the high technical difficulty, high treatment cost and small market segment, there has been a lack of development and application of relevant technologies for the heavy metal-containing organic wastewater generated during the production process of Zowa for a long time. Content of the Utility Model

[0006] The utility model provides a device for treating mercury-containing organic wastewater in the process of processing Tibetan medicine, which adopts the processes of filtration, electrocatalytic pretreatment, heavy metal capture, targeted adsorption and solid-liquid separation to treat a large amount of wastewater with high mercury content, high chromaticity, high suspended solids and high COD generated during the processing of Tibetan medicine Zowa, effectively reducing the mercury concentration in the wastewater, and being successfully applied to engineering applications, realizing the development and application of such wastewater treatment technologies in the field of Tibetan medicine.

[0007] The specific scheme is as follows:

[0008] A device for treating mercury-containing organic wastewater in the process of processing Tibetan medicine includes a raw water tank, a microfiltration membrane treatment unit, an electrocatalytic pretreatment unit, a mercury capture and separation unit, and a high-precision filtration unit which are connected in sequence. The electrocatalytic pretreatment unit is also connected to a comprehensive waste gas purification unit.

[0009] The mercury capture and separation unit includes a sulfur-based compound reaction tank, a PAM reaction tank and a clarification tank which are connected in sequence; the sulfur-based compound reaction tank is connected to a sulfur-based compound dosing device; the PAM reaction tank is connected to a PAM dosing device.

[0010] The sulfur-based compound reaction tank and the PAM reaction tank are both equipped with stirrers to make the reaction complete.

[0011] The microfiltration membrane treatment unit uses a microporous membrane filter with a filtration accuracy of 10 μm, which can remove large particle impurities such as animal and plant residues in the wastewater;

[0012] The electrocatalytic pretreatment unit generates hydroxyl radicals through the electrode group to destroy the organic matter in the wastewater, reduce the COD content in the water, and oxidize mercury in the wastewater to Hg 2+ , for pretreatment of the mercury capture and separation unit; and the generated organic waste gas is purified by a comprehensive waste gas purification unit equipped at the back end. The comprehensive waste gas purification unit uses modified activated carbon for absorption treatment, so that the total mercury content in the waste gas is far lower than the Comprehensive Emission Standard for Air Pollutants (GB 16297--1996); the electrocatalytic pretreatment unit is prepared by depositing carbon-based modified inert materials (SiO2 and Al2O3) in the form of a thin film on the electrode substrate through hot wire chemical vapor deposition. It has the characteristics of high potential window, high oxygen evolution potential, high conductivity, high catalytic activity, acid and alkali resistance, corrosion resistance, high stability, and long service life, and has good treatment effects on wastewater with high mercury, high chroma, high suspended solids and high COD in the actual application process.

[0013] In the mercury capture and separation unit, a sulfur-based compound is added as a capturer through a sulfur-based compound dosing device, mainly one or more of sodium sulfide, sodium hydrosulfide, sodium sulfate, sodium metabisulfite, sodium thiosulfate, and sodium sulfite are mixed in proportion, and a capture reaction is carried out in the sulfur-based compound reaction pool. Various sulfur ion forms in the sulfur-based compound combine with mercury in the wastewater to form sulfur and mercury compounds; then PAM flocculant is added through the PAM dosing device to carry out a flocculation reaction in the PAM reaction pool, so as to achieve targeted adsorption of mercury in the wastewater, and finally solid-liquid separation is achieved in the clarifier.

[0014] The high-precision filtration unit uses a high-precision microporous membrane filter with a filtration accuracy of 5 μm to remove mercury-containing sludge with a particle size of more than 5 μm generated by the mercury capture and separation unit, and remove mercury and its compounds in the water.

[0015] Through the present utility model, a large amount of wastewater with high mercury, high chroma, high suspended solids and high COD generated during the processing of Tibetan medicine Zuotai can be treated, which can greatly reduce the organic matter content of the water sample, reduce the water quality chroma, remove suspended solids in the water and reduce the mercury concentration in the water. The adsorption effect on mercury in the wastewater can reach 99.9%, effectively reducing the toxicity of the wastewater, and finding a practical method for treating mercury-containing sewage in the Tibetan medicine industry. This method has broad application value for the Tibetan medicine industry with a huge annual wastewater generation. Brief Description of the Drawings

[0016] Figure 1 . Structural schematic diagram of the present utility model. Detailed Embodiments

[0017] Such as Figure 1As shown in the figure, a mercury-containing organic wastewater treatment device for the processing of Tibetan medicine includes a raw water tank 1, a microfiltration membrane treatment unit 2, an electrocatalytic pretreatment unit 3, a mercury capture and separation unit 4, and a high-precision filtration unit 5 that are connected in sequence. The electrocatalytic pretreatment unit 3 is also connected to a comprehensive waste gas purification unit 6.

[0018] The mercury capture and separation unit 4 includes a sulfur-based compound reaction tank 41, a PAM reaction tank 42, and a clarification tank 43 that are connected in sequence; the sulfur-based compound reaction tank 41 is connected to a sulfur-based compound dosing device 7; the PAM reaction tank 42 is connected to a PAM dosing device 8.

[0019] The sulfur-based compound reaction tank 41 and the PAM reaction tank 42 are both equipped with stirrers 44.

[0020] The microfiltration membrane treatment unit 2 uses a microporous membrane filter with a filtration accuracy of 10 μm to remove large-particle impurities such as animal and plant residues in the wastewater;

[0021] The electrocatalytic pretreatment unit 3 generates hydroxyl radicals through an electrode group to destroy the organic matter in the wastewater, reduce the COD content in the water, and oxidize mercury in the wastewater to Hg 2+ , for pretreatment of the mercury capture and separation unit 4; and the generated organic waste gas is purified by the comprehensive waste gas purification unit 6 at the back end. The comprehensive waste gas purification unit 6 uses modified activated carbon for absorption treatment, so that the total mercury content in the waste gas is far lower than the comprehensive emission standard of air pollutants (GB 16297-1996); the electrocatalytic pretreatment unit 3 is prepared by thermally assisted chemical vapor deposition in the form of a thin film on an electrode substrate using carbon-based modified inert materials (SiO2 and Al2O3). The current density generated per unit area of the electrode is 100 mA / cm 2 . It has characteristics such as high potential window, high oxygen evolution potential, high conductivity, high catalytic activity, acid and alkali resistance, high stability, and long life, and has good treatment effects on wastewater with high mercury, high chroma, high suspended solids, and high COD in the actual application process.

[0022] In the mercury capture and separation unit 4, 4 mg / L of sulfur-based compounds are added through the sulfur-based compound dosing device 7 as a capture agent, mainly one or more of sodium sulfide, sodium bisulfide, sodium sulfate, sodium metabisulfite, sodium thiosulfate, and sodium sulfite are mixed in proportion, and a capture reaction is carried out in the sulfur-based compound reaction tank 41. Various sulfur ion forms in the sulfur-based compounds combine with mercury in the wastewater to form sulfur and mercury compounds; then 2 mg / L of PAM flocculant is added through the PAM dosing device 8 to carry out a flocculation reaction in the PAM reaction tank 42, so as to achieve targeted adsorption of mercury in the wastewater, and finally solid-liquid separation is achieved in the clarification tank 43.

[0023] The high-precision filtration unit 5 uses a high-precision microporous filter to remove the mercury-containing sludge with a particle size of more than 5 μg generated by the mercury capture and separation unit 4, and remove mercury and its compounds in the water.

[0024] Through the present utility model, a large amount of wastewater with high mercury content, high chromaticity, high suspended solids and high COD generated during the processing of Tibetan medicine Zuotai can be treated, which can greatly reduce the organic matter content of the water sample, reduce the chromaticity of the water quality, remove the suspended solids in the water and reduce the mercury concentration in the water. The adsorption effect of mercury in the wastewater can reach 99.9%, effectively reducing the toxicity of the wastewater, and finding a practical method for treating mercury-containing sewage in the Tibetan medicine industry. This method has broad application value for the Tibetan medicine industry with a huge annual wastewater generation.

[0025] For the mercury-containing organic wastewater of a Tibetan medicine unit in Qinghai, using the wastewater treatment device of the present utility model, the total mercury content before treatment is 6250 μg / L, and after treatment, the total mercury content is 2.5 μg / L; for the heavy metal boiling wastewater of a pharmaceutical enterprise, using this device, the total mercury content before treatment is 10264 μg / L, and after treatment, the total mercury content is 11.5 μg / L.

[0026] The above are only some preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A device for treating mercury-containing organic wastewater in the process of Tibetan medicine preparation, characterized in that: It includes a raw water tank, a microfiltration membrane treatment unit, an electrocatalytic pretreatment unit, a mercury capture and separation unit, and a high-precision filtration unit connected in sequence. The electrocatalytic pretreatment unit is also connected to a comprehensive exhaust gas purification unit; the mercury capture and separation unit includes a sulfur compound reaction tank, a PAM reaction tank and a clarification tank connected in sequence; the sulfur compound reaction tank is connected to a sulfur compound dosing device; and the PAM reaction tank is connected to a PAM dosing device.

2. The device for treating mercury-containing organic wastewater in the Tibetan medicine processing process according to claim 1 is characterized in that: The sulfur compound reaction tank and the PAM reaction tank are both equipped with stirrers.

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