Pretreatment system and method for tobacco and tobacco product analysis and detection waste liquid

Abstract

The invention provides a pretreatment system and method for tobacco and tobacco product analysis and detection waste liquid. The pretreatment system for the tobacco and tobacco product analysis and detection waste liquid comprises a box body, a total plant alkaloid detection waste liquid treatment unit, a total sugar detection waste liquid treatment unit, a total nitrogen detection waste liquid treatment unit, a chlorine detection waste liquid treatment unit and a cooling unit, the total plant alkaloid detection waste liquid treatment unit, the total sugar detection waste liquid treatment unit, the total nitrogen detection waste liquid treatment unit and the chlorine detection waste liquid treatment unit are arranged in the box body in parallel. The system integrates the functions of split-flow collection, cooling, directional treatment, liquid level monitoring and the like, and can effectively solve the problem of waste liquid pretreatment of the tobacco detection chamber. The device has safety, pertinence, high efficiency and environmental friendliness, provides a feasible solution for waste liquid pretreatment in a tobacco detection laboratory, and has good application prospects and large-scale popularization potential in the field of tobacco chemical experiments.

Description

Technical Field

[0001] This invention relates to wastewater treatment technology, and more particularly to a pretreatment system and method for wastewater from the analysis and testing of tobacco and tobacco products. Background Technology

[0002] Continuous flow analysis is a crucial method for tobacco testing, and as a core component of quality control, safety supervision, and compliance in the tobacco industry, it significantly impacts the industry's sustainable development, including production and R&D. The waste liquid from continuous flow analysis is corrosive, toxic (e.g., containing cyanide), and has a high organic load. Its collection and treatment must strictly adhere to general laboratory safety standards, hazardous waste disposal regulations, and relevant environmental protection requirements of the tobacco industry. The components in this waste liquid pose a serious threat to human health and the ecological environment. Currently, tobacco testing laboratories have significant shortcomings in the pretreatment of waste liquid from continuous flow analysis. Many laboratories collect waste liquid from different testing items in the same waste liquid tank, leading to exothermic neutralization reactions of acidic and alkaline substances, accelerated decomposition of toxic components such as cyanide, cross-reactions generating highly toxic substances, and heavy metal-organic compound pollution, among other issues. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems by proposing a pretreatment system for waste liquid from tobacco and tobacco product analysis and testing. This system integrates functions such as diversion collection, cooling, targeted treatment, and liquid level monitoring, effectively solving the problem of waste liquid pretreatment in tobacco testing laboratories. This device combines safety, specificity, high efficiency, and environmental friendliness, providing a practical solution for waste liquid pretreatment in tobacco testing laboratories, and has promising application prospects and large-scale promotion potential in the field of tobacco chemical experiments.

[0004] It should be noted that, in this invention, unless otherwise specified, the specific meaning of "comprising" in relation to composition and description includes both open-ended meanings such as "comprising," "including," etc., and closed-ended meanings such as "composed of," "consisting of," etc., and similar meanings.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a pretreatment system for waste liquid from tobacco and tobacco product analysis and testing, comprising a housing, a waste liquid treatment unit for total alkaloids testing, a waste liquid treatment unit for total sugar testing, a waste liquid treatment unit for total nitrogen testing, a waste liquid treatment unit for chlorine testing, and a cooling unit; the waste liquid treatment units for total alkaloids testing, total sugar testing, total nitrogen testing, and chlorine testing are arranged in parallel within the housing;

[0006] The total alkaloid detection wastewater treatment unit includes a storage tank, a treatment tank, and a hydrogen peroxide storage tank. The wastewater outlet of the total alkaloid detection device is connected to the inlet of the storage tank via a diversion pipe, and the outlet of the storage tank is connected to the inlet of the treatment tank. The treatment tank of the total alkaloid detection wastewater treatment unit is a transparent container with an ultraviolet lamp assembly installed on its outer wall. The hydrogen peroxide storage tank is connected to the treatment tank. An online oxidation-reduction potential (ORP) detection device is installed at the top of the treatment tank.

[0007] The total sugar detection waste liquid treatment unit includes a storage tank, a treatment tank, and a first dilute hydrochloric acid storage tank. The wastewater outlet of the total sugar detection device is connected to the inlet of the storage tank through a diversion pipe. The outlet of the storage tank is connected to the inlet of the treatment tank. The first dilute hydrochloric acid storage tank is connected to the treatment tank. A pH meter is installed on the top of the treatment tank.

[0008] The total nitrogen detection wastewater treatment unit includes a storage tank, a treatment tank, and a lime slurry storage tank. The wastewater outlet of the total nitrogen detection device is connected to the inlet of the storage tank through a diversion pipe. The outlet of the storage tank is connected to the inlet of the treatment tank. The lime slurry storage tank is connected to the treatment tank.

[0009] The chlorine detection waste liquid treatment unit includes a storage tank, a treatment tank, and a second dilute hydrochloric acid storage tank. The wastewater outlet of the chlorine detection device is connected to the inlet of the storage tank through a diversion pipe. The outlet of the storage tank is connected to the inlet of the treatment tank. A resin adsorption column is installed inside the treatment tank. A spraying device with nozzles facing the resin adsorption column is installed on the inner wall of the treatment tank. The second dilute hydrochloric acid storage tank is connected to the spraying device.

[0010] The cooling unit includes a cooling water tank and a water-cooled jacket. The cooling water tank is located outside the tank body, and the water-cooled jacket is fitted around the neck of the storage tank. The cooling water tank and the water-cooled jacket are connected by a cooling water inlet pipe and a cooling water return pipe.

[0011] Furthermore, the pretreatment system for the waste liquid from the analysis and testing of tobacco and tobacco products also includes a control unit, which is communicatively connected to a liquid level monitoring and alarm device, a control valve, an ultraviolet lamp assembly, a stirrer, an online oxidation-reduction potential (ORP) detection device, a pH meter, a drive pump for a hydrogen peroxide storage tank, a drive pump for a first dilute hydrochloric acid storage tank, a drive pump for a lime milk storage tank, and a drive pump for a second dilute hydrochloric acid storage tank.

[0012] Furthermore, the upper part of the storage tank of the total alkaloid detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device, and a control valve is installed at its bottom outlet.

[0013] Furthermore, the treatment tank of the total alkaloid detection waste liquid treatment unit is provided with a dosing port on its side wall, and the outlet of the hydrogen peroxide storage tank is connected to the dosing port.

[0014] Furthermore, the bottom of the treatment tank of the total alkaloid detection waste liquid treatment unit is equipped with a stirrer.

[0015] During the determination of total alkaloids, organic acids, unreacted nicotine, and cyanogen chloride are easily generated. Cyanogen chloride (CNCl) is produced by the online colorimetric reaction of potassium thiocyanate (KSCN) and sodium dichloroisocyanurate. Unreacted cyanide precursors and reaction byproducts ultimately enter the waste liquid. Cyanide is a highly toxic substance; inhalation of 50 ppm can be fatal to humans. Its toxicity stems from inhibiting cytochrome c oxidase in the cellular respiratory chain, leading to tissue hypoxia. More seriously, under acidic conditions, residual cyanide in the waste liquid may generate volatile hydrogen cyanide (HCN), which can enter the human body through the respiratory tract, causing acute poisoning and harming the human respiratory system.

[0016] The total alkaloid detection waste liquid treatment unit uses ultraviolet lamp catalytic oxidation and hydrogen peroxide technology. The waste liquid in the treatment tank is irradiated with 254nm ultraviolet light through the dosing port, converting cyanide into low-toxicity cyanate (2CN). - +H₂O₂ + 2OH⁻ - →2CNO - +2H₂O (under ultraviolet light and alkaline conditions) further hydrolyzes into CO₂ and NH₄⁺. 4+ (CNO - +2H + +H₂O→CO₂↑+NH₄ + An online detection of oxidation-reduction potential (ORP) is set up, and cyanide decomposition is determined to be complete when ORP > 400mV.

[0017] Furthermore, the upper part of the storage tank of the total sugar detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device, and a control valve is installed at its bottom outlet.

[0018] Furthermore, a stirrer is installed at the bottom of the treatment tank of the total sugar detection waste liquid treatment unit.

[0019] Total sugar testing is conducted in an alkaline environment using large amounts of sodium hydroxide or sodium carbonate to make the waste liquid highly alkaline. The mixing of the acidic and alkaline waste liquids produces a violent neutralization reaction, releasing heat and irritating gases.

[0020] After cooling the total sugar testing waste liquid, the total sugar testing waste liquid treatment unit adds dilute hydrochloric acid to the treatment tank multiple times and in small amounts under real-time pH monitoring for neutralization and pretreatment. The pretreatment is completed when the pH reaches neutral.

[0021] Furthermore, the upper part of the storage tank of the total nitrogen detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device, and a control valve is installed at its bottom outlet.

[0022] Furthermore, the total nitrogen detection waste liquid treatment unit also includes a filter screen and a pneumatic lifting device. The pneumatic lifting device is located outside the treatment tank, and the filter screen is located inside the treatment tank. The outer diameter of the filter screen matches the inner diameter of the treatment tank. The lifting component of the pneumatic lifting device extends into the treatment tank opening and connects to the filter screen. The pneumatic lifting device can realize the raising and lowering of the filter screen.

[0023] Furthermore, the pneumatic lifting device is communicatively connected to the control unit.

[0024] The total nitrogen was not completely reacted during the determination process. The sulfuric acid and strong acid-base mixture containing ammonium salts and other substances have certain volatilization hazards.

[0025] The total nitrogen detection waste liquid treatment unit repeatedly adds small amounts of lime slurry into the treatment tank to neutralize (Ca(OH)2 + 2H+). + →Ca 2+ +2H2O), the filter screen is lifted by a pneumatic lifting device, causing heavy metal ions to precipitate (M n+ +nOH - →M(OH)↓), to complete the pretreatment work.

[0026] Furthermore, the upper part of the storage tank of the chlorine detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device, and a control valve is installed at its bottom outlet.

[0027] Furthermore, the chlorine detection waste liquid treatment unit also includes a mercury-containing acid washing solution tank, which is located on the outside of the tank body, and the bottom outlet of the treatment tank is connected to the mercury-containing acid washing solution tank through an electric valve.

[0028] Chlorine readily produces toxic heavy metals such as mercury and thiocyanate complexes during the determination process. The mercuric thiocyanate (Hg(SCN)2) used in the detection releases mercury ions (Hg) after the reaction. 2+ Mercury is a cumulative neurotoxin that can cross the blood-brain barrier and cause damage to the central nervous system. The halogenated organic byproducts generated by the reaction of mercuric thiocyanate and chloride ions have carcinogenic, teratogenic, and mutagenic effects.

[0029] The chlorine detection wastewater treatment unit employs a sulfur-loaded benzimidazole resin adsorption method. It utilizes the adsorption of mercury by the resin adsorption column, primarily through the synergistic chelation of the sulfur group and the imidazole ring, with some electrostatic assistance. Therefore, it exhibits high selectivity and strong adsorption capacity for mercury ions, making it suitable for treating mercury-containing wastewater and other similar scenarios. The adsorbed resin can be reused by acid desorption using dilute hydrochloric acid spraying. After acid washing, the mercury is collected in a mercury-containing acid washing tank via an electric valve, allowing for safe disposal or recovery of the mercury, thus meeting environmental protection requirements.

[0030] Furthermore, the pretreatment system for tobacco and tobacco product analysis waste liquid also includes a pre-collection tank, located outside the main body. The bottom outlet of the treatment tank is connected to the pre-collection tank via an electric drain valve. Specifically, the bottom outlets of the treatment tanks of the total alkaloid detection waste liquid treatment unit, the total sugar detection waste liquid treatment unit, and the total nitrogen detection waste liquid treatment unit are connected to the pre-collection tank via electric drain valves. The pretreated waste liquid from these three units is collected in the pre-collection tank via the electric drain valve to complete the pretreatment process before undergoing further treatment. The pre-collection tank facilitates unified collection after pretreatment. Additionally, a separate mercury-containing acid washing tank can be installed. The waste liquid treated by the chlorine detection waste liquid treatment unit is mercury-containing and is collected in the mercury-containing acid washing tank for separate treatment, allowing for further processing and recycling of the mercury.

[0031] Another objective of this invention is to disclose a pretreatment method for waste liquid from the analysis and testing of tobacco and tobacco products, comprising the following steps:

[0032] Step 1, Categorized Collection (based on storage and treatment tanks): For the different waste liquids generated by the four-channel continuous flow analysis of total alkaloids, total sugar, total nitrogen, and chlorine (specifically, waste liquids for total alkaloid detection, total sugar detection, total nitrogen detection, and chlorine detection), separate storage and treatment tanks are set up for each channel to achieve categorized collection, avoid the risk of mixing incompatible waste liquids, and control the safety of waste liquid treatment from the source.

[0033] Step 2, Cooling treatment (with the aid of a cooling unit): The waste liquid first enters the distribution pipe, and then the cooling water tank supplies cooling water to the water-cooled jacket through the cooling water inlet pipe and the cooling water return pipe to initially cool the waste liquid, so that the chemical composition in the waste liquid tends to stabilize, prevent secondary reactions or decomposition, and create stable conditions for subsequent treatment.

[0034] Step 3, Targeted Treatment (treatment based on the characteristics of different waste liquids):

[0035] Total alkaloids test waste liquid: In the treatment tank, 254nm ultraviolet light irradiation is used for catalysis by ultraviolet lamp group, and hydrogen peroxide is added from the dosing port for oxidation. At the same time, the oxidation-reduction potential (ORP) is detected online. When ORP>400mV, it is determined that the cyanide decomposition is complete, the pretreatment is completed, and it is recycled to the pre-collection tank. The bottom stirrer assists the hydrolysis reaction.

[0036] Total sugar test waste liquid: After cooling, it is placed in a pretreatment tank and neutralized by adding dilute hydrochloric acid in small amounts multiple times through the dosing port, monitored by a pH meter.

[0037] Total nitrogen test waste liquid: Lime slurry is added to the treatment tank in small amounts multiple times for neutralization. The filter screen is lifted by a pneumatic lifting device to separate heavy metal ions and precipitate them, thus completing the pretreatment.

[0038] Chlorine detection waste liquid: Mercury ions are adsorbed using a resin adsorption column. The adsorbed resin is desorbed by spraying with dilute hydrochloric acid through a spray device, so as to realize the reuse of the resin. After acid washing, it enters the mercury-containing acid washing liquid tank through an electric valve for collection, and the mercury is safely disposed of or recovered.

[0039] Step 4, Unified Collection (relying on electric drain valves and pre-collection tanks): The pre-treated waste liquid from the total alkaloid testing waste liquid treatment unit, the total sugar testing waste liquid treatment unit, and the total nitrogen testing waste liquid treatment unit is collected in a pre-collection tank through the electric drain valve located in each treatment tank, and then undergoes further treatment. This treatment can be carried out by a professionally qualified treatment company.

[0040] Furthermore, before step 3, when the liquid level monitoring and alarm device in the storage tank detects that the liquid level has reached the set value, the waste liquid flows to the treatment tank through the control valve and is treated according to the different characteristics of the waste liquid.

[0041] Another objective of this invention is to disclose the application of a pretreatment system for waste liquid from the analysis and testing of tobacco and tobacco products in the field of tobacco chemical experiments.

[0042] This invention relates to a pretreatment system and method for waste liquid from tobacco and tobacco product analysis and testing. Addressing the pretreatment problem of waste liquid generated from four-channel continuous flow analysis of total alkaloids, total sugars, chlorine, and total nitrogen in tobacco testing laboratories, this invention achieves integrated treatment of these four types of waste liquid. Specifically, compared with existing technologies, this invention has the following advantages:

[0043] 1) Accurate classification and collection, avoiding risks at the source.

[0044] By setting up independent storage and treatment tanks for different analytical modules (total alkaloids, total sugars, chlorine, and total nitrogen), strict classification and collection of waste liquids are achieved, fundamentally avoiding safety hazards caused by the mixing of incompatible waste liquids. For example, it prevents the mixing of acids and cyanides from generating highly toxic hydrogen cyanide, or the mixing of acid and alkali waste liquids from producing violent exothermic and irritating gases, significantly reducing immediate risks in the laboratory.

[0045] 2) The pretreatment process is scientific, ensuring the stability of the waste liquid.

[0046] Cooling pretreatment: The high-temperature waste liquid (generated by the heating reaction during testing) is initially cooled using a water-cooled jacket cooling system to stabilize the chemical composition of the waste liquid, avoid subsequent secondary reactions or decomposition, and provide a safe and controllable basic environment for subsequent treatment.

[0047] Intelligent liquid level monitoring: The storage tank is equipped with a liquid level monitoring and alarm device. By setting a dangerous liquid level threshold, an alarm can be triggered in time and the waste liquid can be guided to the treatment tank through the control valve, which can effectively prevent waste liquid from overflowing and improve operational safety.

[0048] 3) Targeted treatment is highly efficient and effectively addresses the toxicity of waste liquids.

[0049] Customized treatment technologies are employed based on the characteristics of different waste liquids to achieve efficient removal or transformation of toxic substances:

[0050] Total plant alkali waste liquid: Through ultraviolet light (254nm) catalysis + hydrogen peroxide oxidation technology, highly toxic cyanide is converted into low-toxicity cyanate under alkaline conditions, and then hydrolyzed to generate harmless CO2 and NH4+. 4+ Combined with online ORP detection (ORP > 400mV is considered acceptable), ensure that cyanide decomposition is complete.

[0051] Total sugar waste liquid: Using a pH meter to precisely control the addition of small amounts of dilute hydrochloric acid multiple times, the strongly alkaline waste liquid is safely neutralized, avoiding an overly violent neutralization reaction.

[0052] Total nitrogen waste liquid: strong acid is neutralized by lime milk, and heavy metal hydroxide precipitates are separated by a pneumatic lifting device and filter screen, which can efficiently treat acid-base mixtures and heavy metal pollution.

[0053] Chlorine waste liquid: The sulfur-loaded benzimidazole resin adsorption column is used to selectively adsorb mercury ions by utilizing the synergistic chelation effect of sulfur group and imidazole ring. The resin can be reused by desorption with dilute hydrochloric acid, and mercury resources can be recovered at the same time, taking into account both environmental protection and resource recycling.

[0054] 4) Operations are compliant with environmental regulations, balancing safety and sustainability.

[0055] All pretreated waste liquid enters a pre-collection tank or a mercury-containing pickling solution tank, and is finally transferred to a qualified professional company for deep treatment, in compliance with environmental regulations, forming a complete closed loop of "classification-pretreatment-professional treatment".

[0056] The design incorporates resin adsorption and mercury recovery to achieve resource recycling, reduce hazardous waste generation, and respond to green environmental protection policies.

[0057] 5) Improve laboratory management and strengthen risk prevention.

[0058] By integrating functions such as diversion collection, cooling, targeted treatment, and intelligent monitoring, the system systematically solves the problems of fragmented and high-risk pretreatment of waste liquid in tobacco testing laboratories, optimizes laboratory operation procedures, and reduces the probability of personnel being exposed to highly toxic substances.

[0059] In summary, the pretreatment system for tobacco and tobacco product analysis and testing waste liquid of the present invention mainly integrates functions such as diversion collection, cooling, targeted treatment, and liquid level monitoring, which can effectively solve the problem of waste liquid pretreatment in tobacco testing laboratories. This device combines safety, specificity, high efficiency, and environmental friendliness, providing a practical solution for waste liquid pretreatment in tobacco testing laboratories, and has good application prospects and large-scale promotion potential in the field of tobacco chemical experiments. Attached Figure Description

[0060] Figure 1 A perspective view of a pretreatment system for wastewater from the analysis and testing of tobacco and tobacco products;

[0061] Figure 2 A cross-sectional view of a pretreatment system for waste liquid from the analysis and testing of tobacco and tobacco products;

[0062] Figure 3 A schematic diagram of the pretreatment tank for waste liquid analysis and testing of tobacco and tobacco products;

[0063] Figure 4 A schematic diagram of the pre-collection tank and mercury-containing acid washing solution tank of the pretreatment system for waste liquid analysis and testing of tobacco and tobacco products;

[0064] Figure 5 Flowchart of the pretreatment method for waste liquid from tobacco and tobacco product analysis and testing. Detailed Implementation

[0065] The present invention will be further described below with reference to embodiments. The description of the technical features described below is based on representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:

[0066] Unless otherwise stated, all units used in this specification are international standard units, and all numerical values ​​and ranges appearing in this invention should be understood to include systematic errors that are unavoidable in industrial production.

[0067] In this specification, the range of values ​​referred to as "value A to value B" refers to the range including the endpoint values ​​A and B.

[0068] In this specification, the numerical range indicated by "above" or "below" refers to the numerical range that includes the stated number.

[0069] In this specification, the word "may" has two meanings: to perform a certain process and not to perform a certain process.

[0070] In this specification, the terms "optional" or "optional" are used to indicate the use or omission of certain substances, components, procedures, application conditions, etc.

[0071] In this instruction manual, when "room temperature" or "room temperature" is used, the temperature can be 15-25℃.

[0072] Unless otherwise specified, all reagents or instruments used in this instruction manual are commercially available products.

[0073] Example 1

[0074] In the continuous flow method for determining total alkaloids, it is estimated that about 30 mg of cyanide will be generated for every 30 samples tested. Under the advanced oxidation treatment of ultraviolet light coupled with hydrogen peroxide, the degradation rate of the waste liquid for total alkaloid testing (low concentration of cyanide is basically completely treated) is high and the cost is low.

[0075] This embodiment discloses a pretreatment system for waste liquid from the analysis and testing of tobacco and tobacco products, the structure of which is as follows: Figure 1-4 As shown, it includes a rectangular box, a total alkaloid detection waste liquid treatment unit, a total sugar detection waste liquid treatment unit, a total nitrogen detection waste liquid treatment unit, a chlorine detection waste liquid treatment unit, and a cooling unit; the total alkaloid detection waste liquid treatment unit, the total sugar detection waste liquid treatment unit, the total nitrogen detection waste liquid treatment unit, and the chlorine detection waste liquid treatment unit are arranged in parallel in the box;

[0076] The total alkaloid detection wastewater treatment unit includes a storage tank 1, a treatment tank 2, and a hydrogen peroxide storage tank 13. The wastewater outlet of the total alkaloid detection device is connected to the inlet of the storage tank 1 via a diversion pipe 3, and the outlet of the storage tank 1 is connected to the inlet of the treatment tank 2. The treatment tank 2 of the total alkaloid detection wastewater treatment unit is a transparent container with an ultraviolet lamp group 10 installed on its outer wall. The hydrogen peroxide storage tank 13 is connected to the treatment tank 2. An online oxidation-reduction potential (ORP) detection device 12 is installed at the top inside the treatment tank 2.

[0077] The total sugar detection waste liquid treatment unit includes a storage tank 1, a treatment tank 2, and a first dilute hydrochloric acid storage tank 16. The wastewater outlet of the total sugar detection device is connected to the inlet of the storage tank 1 through a diversion pipe 3. The outlet of the storage tank 1 is connected to the inlet of the treatment tank 2. The first dilute hydrochloric acid storage tank 16 is connected to the treatment tank 2. A pH meter 15 is installed on the top of the treatment tank 2.

[0078] The total nitrogen detection waste liquid treatment unit includes a storage tank 1, a treatment tank 2, and a lime slurry storage tank 17. The wastewater outlet of the total nitrogen detection device is connected to the inlet of the storage tank 1 through a diversion pipe 3. The outlet of the storage tank 1 is connected to the inlet of the treatment tank 2. The lime slurry storage tank 17 is connected to the treatment tank 2.

[0079] The chlorine detection wastewater treatment unit includes a storage tank 1, a treatment tank 2, and a second dilute hydrochloric acid storage tank 21. The wastewater outlet of the chlorine detection device is connected to the inlet of the storage tank 1 through a diversion pipe 3. The outlet of the storage tank 1 is connected to the inlet of the treatment tank 2. A resin adsorption column 20 is installed inside the treatment tank 2. A spray device 22 with nozzles facing the resin adsorption column 20 is installed on the inner wall of the treatment tank 2. The second dilute hydrochloric acid storage tank 21 is connected to the spray device 22.

[0080] The cooling unit includes a cooling water tank 5 and a water-cooled jacket 4. The cooling water tank 5 is located outside the tank body, and the water-cooled jacket 4 is fitted onto the neck of the storage tank 1. The cooling water tank 5 and the water-cooled jacket 4 are connected by a cooling water inlet pipe 6 and a cooling water return pipe 7.

[0081] The pretreatment system for waste liquid from tobacco and tobacco product analysis and testing also includes a control unit, which is communicatively connected to the liquid level monitoring and alarm device 8, control valve 9, ultraviolet lamp group 10, stirrer 11, online oxidation-reduction potential (ORP) detection device 12, pH meter 15, drive pump of hydrogen peroxide storage tank 13, drive pump of first dilute hydrochloric acid storage tank 16, drive pump of lime milk storage tank 17, and drive pump of second dilute hydrochloric acid storage tank 21.

[0082] The storage tank 1 of the total alkaloid detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device 8 at the upper part, and a control valve 9 at its bottom outlet.

[0083] The treatment tank 2 of the total alkaloid detection waste liquid treatment unit is provided with a dosing port 14 on its side wall, and the outlet of the hydrogen peroxide storage tank 13 is connected to the dosing port 14.

[0084] The bottom of the treatment tank 2 of the total alkaloid detection waste liquid treatment unit is equipped with a stirrer 11.

[0085] The storage tank 1 of the total sugar detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device 8 at the upper part, and a control valve 9 at its bottom outlet.

[0086] The bottom of the treatment tank 2 of the total sugar detection waste liquid treatment unit is equipped with a stirrer 11.

[0087] The storage tank 1 of the total nitrogen detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device 8 at the upper part, and a control valve 9 is installed at its bottom outlet.

[0088] The total nitrogen detection waste liquid treatment unit also includes a filter screen 19 and a pneumatic lifting device 18. The pneumatic lifting device 18 is located outside the treatment tank 2, and the filter screen 19 is located inside the treatment tank 2. The outer diameter of the filter screen 19 matches the inner diameter of the treatment tank 2. The lifting component of the pneumatic lifting device 18 extends into the opening of the treatment tank 2 and connects to the filter screen 19. The pneumatic lifting device 18 can realize the raising and lowering of the filter screen 19.

[0089] The pneumatic lifting device 18 is communicatively connected to the control unit.

[0090] The storage tank 1 of the chlorine detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device 8 at the upper part, and a control valve 9 is installed at its bottom outlet.

[0091] The chlorine detection waste liquid treatment unit also includes a mercury-containing acid washing liquid tank 26, and the bottom outlet of the treatment tank 2 is connected to the mercury-containing acid washing liquid tank 26 through an electric valve 24.

[0092] The pretreatment system for waste liquid from tobacco and tobacco product analysis and testing also includes a pre-collection tank 25. The bottom outlets of the treatment tanks of the total alkaloid detection waste liquid treatment unit, the total sugar detection waste liquid treatment unit, and the total nitrogen detection waste liquid treatment unit are connected to the pre-collection tank 25 via electric drain valves.

[0093] The method for treating wastewater using the above-mentioned pretreatment system for tobacco and tobacco product analysis wastewater is as follows: Figure 5 As shown, it includes the following steps:

[0094] Step 1, Categorized Collection (based on storage and treatment tanks): For the different waste liquids generated by the four-channel continuous flow analysis of total alkaloids, total sugar, total nitrogen, and chlorine (specifically, waste liquids for total alkaloid detection, total sugar detection, total nitrogen detection, and chlorine detection), separate storage and treatment tanks are set up for each channel to achieve categorized collection, avoid the risk of mixing incompatible waste liquids, and control the safety of waste liquid treatment from the source.

[0095] Step 2, Cooling treatment (with the aid of a cooling unit): The waste liquid first enters the distribution pipe, and then the cooling water tank supplies cooling water to the water-cooled jacket through the cooling water inlet pipe and the cooling water return pipe to initially cool the waste liquid, so that the chemical composition in the waste liquid tends to stabilize, prevent secondary reactions or decomposition, and create stable conditions for subsequent treatment.

[0096] Step 3, Targeted Treatment (treatment based on the characteristics of different waste liquids):

[0097] When the liquid level monitoring and alarm device in the storage tank detects that the liquid level has reached the set value, the waste liquid flows to the treatment tank through the control valve and is treated according to the different characteristics of the waste liquid.

[0098] Total alkaloids in waste liquid: In the treatment tank, 254nm ultraviolet light irradiation is used for catalysis by ultraviolet lamp group, and hydrogen peroxide is added from the dosing port for oxidation. At the same time, the oxidation-reduction potential (ORP) is detected online. When ORP>400mV, it is determined that the cyanide decomposition is complete. The bottom stirrer assists the hydrolysis reaction.

[0099] Total sugar test waste liquid: After cooling, it is placed in a pretreatment tank and neutralized by adding dilute hydrochloric acid in small amounts multiple times through the dosing port, monitored by a pH meter.

[0100] Total nitrogen test waste liquid: Lime slurry is added to the treatment tank in small amounts multiple times for neutralization. The filter screen is lifted by a pneumatic lifting device to separate heavy metal ions and precipitate them, thus completing the pretreatment.

[0101] Chlorine detection waste liquid: Mercury ions are adsorbed using a resin adsorption column. The adsorbed resin is desorbed by spraying with dilute hydrochloric acid through a spray device, so as to realize the reuse of the resin. After acid washing, it enters the mercury-containing acid washing liquid tank through an electric valve for collection, and the mercury is safely disposed of or recovered.

[0102] Step 4: Unified Collection (using electric drain valves and pre-collection tanks): The pre-treated wastewater from the total alkaloid testing wastewater treatment unit, the total sugar testing wastewater treatment unit, and the total nitrogen testing wastewater treatment unit is collected in a pre-collection tank via an electric drain valve located in each treatment tank. Further advanced treatment can be performed by a qualified treatment company. Specifically, the pre-treated wastewater from the total alkaloid testing wastewater treatment unit, the total sugar testing wastewater treatment unit, and the total nitrogen testing wastewater treatment unit is collected in the pre-collection tank via an electric drain valve to complete the pre-treatment process before undergoing advanced treatment. The wastewater from the chlorine testing wastewater treatment unit is mercury-containing wastewater and is collected in a mercury-containing acid washing tank for separate treatment. The mercury can be further processed and recycled.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pretreatment system for waste liquid from the analysis and testing of tobacco and tobacco products, characterized in that, It includes a housing, a waste liquid treatment unit for total alkaloid detection, a waste liquid treatment unit for total sugar detection, a waste liquid treatment unit for total nitrogen detection, a waste liquid treatment unit for chlorine detection, and a cooling unit; the waste liquid treatment units for total alkaloid detection, total sugar detection, total nitrogen detection, and chlorine detection are arranged in parallel in the housing; The total alkaloid detection waste liquid treatment unit includes a storage tank (1), a treatment tank (2), and a hydrogen peroxide storage tank (13). The wastewater outlet of the total alkaloid detection device is connected to the inlet of the storage tank (1) through a diversion pipe (3), and the outlet of the storage tank (1) is connected to the inlet of the treatment tank (2). The treatment tank (2) of the total alkaloid detection waste liquid treatment unit is a transparent container with an ultraviolet lamp group (10) installed on its outer wall. The hydrogen peroxide storage tank (13) is connected to the treatment tank (2). An online redox potential detection device (12) is installed at the top of the treatment tank (2). The total sugar detection wastewater treatment unit includes a storage tank (1), a treatment tank (2), and a first dilute hydrochloric acid storage tank (16). The wastewater outlet of the total sugar detection device is connected to the inlet of the storage tank (1) through a diversion pipe (3). The outlet of the storage tank (1) is connected to the inlet of the treatment tank (2). The first dilute hydrochloric acid storage tank (16) is connected to the treatment tank (2). A pH meter (15) is installed on the top of the treatment tank (2). The total nitrogen detection waste liquid treatment unit includes a storage tank (1), a treatment tank (2) and a lime milk storage tank (17). The wastewater outlet of the total nitrogen detection device is connected to the inlet of the storage tank (1) through a diversion pipe (3). The outlet of the storage tank (1) is connected to the inlet of the treatment tank (2). The lime milk storage tank (17) is connected to the treatment tank (2). The chlorine detection wastewater treatment unit includes a storage tank (1), a treatment tank (2), and a second dilute hydrochloric acid storage tank (21). The wastewater outlet of the chlorine detection device is connected to the inlet of the storage tank (1) through a diversion pipe (3). The outlet of the storage tank (1) is connected to the inlet of the treatment tank (2). A resin adsorption column (20) is installed inside the treatment tank (2). A spraying device (22) with nozzles facing the resin adsorption column (20) is installed on the inner wall of the treatment tank (2). The second dilute hydrochloric acid storage tank (21) is connected to the spraying device (22). The cooling unit includes a cooling water tank (5) and a water-cooled jacket (4). The cooling water tank (5) is located outside the tank body, and the water-cooled jacket (4) is fitted around the neck of the storage tank (1). The cooling water tank (5) and the water-cooled jacket (4) are connected by a cooling water inlet pipe (6) and a cooling water return pipe (7).

2. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, It also includes a control unit, which is connected in communication with the liquid level monitoring and alarm device (8), control valve (9), ultraviolet lamp group (10), stirrer (11), online redox potential detection device (12), pH meter (15), drive pump of hydrogen peroxide storage tank (13), drive pump of first dilute hydrochloric acid storage tank (16), drive pump of lime milk storage tank (17) and drive pump of second dilute hydrochloric acid storage tank (21).

3. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, The storage tank (1) of the total alkaloid detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device (8) at the upper part and a control valve (9) at the bottom outlet. And / or, the treatment tank (2) of the total alkaloid detection waste liquid treatment unit is provided with a dosing port (14) on its side wall, and the outlet of the hydrogen peroxide storage tank (13) is connected to the dosing port (14); And / or, the bottom of the treatment tank (2) of the total alkaloid detection waste liquid treatment unit is provided with a stirrer (11).

4. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, The storage tank (1) of the total sugar detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device (8) at the upper part, and a control valve (9) is installed at the bottom outlet. And / or, the bottom of the treatment tank (2) of the total sugar detection waste liquid treatment unit is provided with a stirrer (11).

5. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, The storage tank (1) of the total nitrogen detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device (8) at the upper part, and a control valve (9) is installed at its bottom outlet; And / or, the total nitrogen detection waste liquid treatment unit further includes a filter screen (19) and a pneumatic lifting device (18). The pneumatic lifting device (18) is located outside the treatment tank (2), and the filter screen (19) is located inside the treatment tank (2). The outer diameter of the filter screen (19) matches the inner diameter of the treatment tank (2). The lifting component of the pneumatic lifting device (18) extends into the opening of the treatment tank (2) and is connected to the filter screen (19). The pneumatic lifting device (18) can realize the raising and lowering of the filter screen (19). The pneumatic lifting device (18) is communicatively connected to the control unit.

6. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, The storage tank (1) of the chlorine detection waste liquid treatment unit is equipped with a liquid level monitoring and alarm device (8) at the upper part and a control valve (9) at the bottom outlet. And / or, the chlorine detection waste liquid treatment unit further includes a mercury-containing acid washing liquid tank (26), and the bottom outlet of the treatment tank (2) is connected to the mercury-containing acid washing liquid tank (26) through an electric valve (24).

7. The pretreatment system for tobacco and tobacco product analysis and testing waste liquid according to claim 1, characterized in that, The pretreatment system for waste liquid from tobacco and tobacco product analysis and testing also includes a pre-collection tank, and the bottom outlet of the treatment tank is connected to the pre-collection tank via an electric drain valve.

8. A pretreatment method for waste liquid from the analysis and testing of tobacco and tobacco products, characterized in that, Includes the following steps: Step 1, Classification and Collection: For the different waste liquids generated by the four-channel continuous flow analysis of total alkaloids, total sugars, total nitrogen and chlorine, separate storage tanks and treatment tanks are set up for each channel to achieve classified collection, avoid the risk of mixing incompatible waste liquids, and control the safety of waste liquid treatment from the source. Step 2, Cooling Treatment: The waste liquid first enters the distribution pipe, and then the cooling water tank supplies cooling water to the water-cooled jacket through the cooling water inlet pipe and the cooling water return pipe to initially cool the waste liquid, so that the chemical composition of the waste liquid tends to stabilize, prevent secondary reactions or decomposition, and create stable conditions for subsequent treatment. Step 3, Targeted Processing: Total alkaloids in waste liquid: In the treatment tank, 254nm ultraviolet light irradiation is used for catalysis by ultraviolet lamp group, and hydrogen peroxide is added from the dosing port for oxidation. At the same time, the oxidation-reduction potential is detected online. When ORP>400mV, it is determined that the cyanide decomposition is complete. The bottom stirrer assists in the hydrolysis reaction. Total sugar test waste liquid: After cooling, it is placed in a pretreatment tank and neutralized by adding dilute hydrochloric acid in small amounts multiple times through the dosing port, monitored by a pH meter. Total nitrogen test waste liquid: Lime slurry is added to the treatment tank in small amounts multiple times for neutralization. The filter screen is lifted by a pneumatic lifting device to separate heavy metal ions and precipitate them, thus completing the pretreatment. Chlorine detection waste liquid: Mercury ions are adsorbed using a resin adsorption column. The adsorbed resin is desorbed by spraying with dilute hydrochloric acid through a spray device, so as to realize the reuse of the resin. After acid washing, it enters the mercury-containing acid washing liquid tank through an electric valve for collection, and the mercury is safely disposed of or recovered. Step 4, Unified Collection: The pre-treated waste liquid from the total alkaloid testing waste liquid treatment unit, the total sugar testing waste liquid treatment unit, and the total nitrogen testing waste liquid treatment unit enters the pre-collection tank for unified collection through the electric drain valve located in each treatment tank, and then undergoes further deep treatment, which can be carried out by a professionally qualified treatment company.

9. The pretreatment method for waste liquid from tobacco and tobacco product analysis and testing according to claim 8, characterized in that, Before step 3, once the liquid level monitoring and alarm device in the storage tank detects that the liquid level has reached the set value, the waste liquid flows to the treatment tank through the control valve and is treated according to the different characteristics of the waste liquid.

10. The application of the pretreatment system for tobacco and tobacco product analysis and testing waste liquid as described in any one of claims 1-7 in the field of tobacco chemical experiments.

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