Efficient and environment-friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system and process

Abstract

The invention relates to a high-efficiency and environment-friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system and process, particularly for oxytetracycline hydrochloride and streptomycin sulfate fermentation mother liquor wastewater, steam heating pretreatment is performed, so that the inhibition of the oxytetracycline hydrochloride and streptomycin sulfate fermentation mother liquor wastewater on microorganisms is greatly reduced, and the biodegradability of the wastewater is remarkably improved; and favorable conditions are created for subsequent biochemical treatment. According to the system, chemicals such as acids, salts, oxidants, flocculants and the like do not need to be additionally added, the cost for storing, blending and adding the chemicals is reduced, meanwhile, extra sludge is not generated, and the sludge treatment cost is reduced. In addition, the system adopts clean energy steam, so that acidic or oxidative corrosion of equipment is avoided, and the service life of the equipment is prolonged. The whole process is automatically operated, the process is stable, only a proper amount of alkali is needed for adjusting the pH value and steam heating is needed, resource consumption is low, cleanliness and environmental protection are achieved, and remarkable technical advantages and environmental benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a highly efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system and process. Background Art

[0002] Oxytetracycline hydrochloride and streptomycin sulfate are basic antibiotics that are widely used in the medical and aquaculture fields. Their market demand continues to expand with the improvement of global medical standards and the growth of the aquaculture industry. However, the production process of these two antibiotics will produce a large amount of wastewater, which has poor biodegradability and is difficult to directly treat biochemically.

[0003] Traditional pretreatment technologies, such as iron-carbon micro-electrolysis and Fenton's reagent, are widely used to improve the biodegradability of oxytetracycline hydrochloride and streptomycin sulfate yeast liquid wastewater. Iron-carbon micro-electrolysis technology has the advantages of no need for additional energy consumption, wide application, and mature technology, but it has the disadvantages of easy compaction of iron-carbon micro-electrolysis fillers leading to blockage, large sludge production, and high sludge disposal costs. Fenton's reagent technology has the advantages of obvious effect, can be used in conjunction with iron-carbon micro-electrolysis, and low energy consumption. However, its reagent cost is high, increases the salt content in the system, and the acid and alkali in the reagent are corrosive. The chemical properties of hydrogen peroxide are unstable and prone to danger, requiring additional safety measures. In addition, Fenton's reagent technology will also produce a large amount of sludge, requiring supporting sedimentation tanks and sludge treatment systems.

[0004] Based on this background, in order to overcome the shortcomings of traditional technologies, there is an urgent need for an efficient and environmentally friendly pretreatment technology that can reduce reagent consumption, reduce secondary pollution, and improve the biodegradability of oxytetracycline hydrochloride and streptomycin sulfate wastewater. Summary of the invention

[0005] In view of the various problems existing in traditional pretreatment technology, the present invention aims to provide an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system and process, which can effectively solve the problems existing in traditional technology such as large consumption of reagents, serious secondary pollution, and low treatment efficiency.

[0006] In order to achieve the above-mentioned object of the invention, the specific technical scheme of the present invention is as follows:

[0007] The present invention provides an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system, comprising a heat exchanger, a primary heating tank and a maintenance tank unit connected in sequence according to the direction of the wastewater treatment process;

[0008] The maintenance tank unit comprises at least one maintenance tank;

[0009] The primary heating tank and the maintenance tank are both provided with a steam heating system, and the steam heating system comprises a wastewater channel and a steam channel, and the steam channel is connected to the steam heating network;

[0010] The wastewater channel outlet of the primary heating tank is connected to the wastewater channel inlet of the adjacent maintenance tank;

[0011] The primary heating tank is used to perform secondary heating on the wastewater after being heated by the heat exchanger;

[0012] The maintenance tank unit is used to ensure that the temperature of the wastewater flowing through is always greater than or equal to T°C;

[0013] The heat exchanger is provided with a refrigerant channel and a heat medium channel;

[0014] The water inlet of the refrigerant channel is used for the inlet of wastewater, and the water outlet of the refrigerant channel is connected with the water inlet of the wastewater channel of the primary heating tank;

[0015] The water inlet of the heat medium channel is communicated with the water outlet of the wastewater channel of the adjacent maintenance tank, and the water outlet of the heat medium channel is communicated with the subsequent sewage treatment unit.

[0016] In some specific embodiments of the present invention, T≥110.

[0017] In some specific embodiments of the invention, the maintenance tank unit comprises three maintenance tanks.

[0018] In some specific embodiments of the present invention, it also includes a wastewater collection tank and a lifting water pump;

[0019] The water outlet of the wastewater collection box is connected to the water inlet of the refrigerant channel of the heat exchanger;

[0020] The wastewater collection box is used to collect oxytetracycline hydrochloride and streptomycin sulfate wastewater, and the lifting water pump is used to send the oxytetracycline hydrochloride and streptomycin sulfate wastewater to the refrigerant channel of the heat exchanger.

[0021] In some specific embodiments of the present invention, a steam pressure stabilizing device, a wastewater pressure stabilizing device and an electric control system are also included;

[0022] The steam pressure stabilizing device uses a pressure sensor linked to an electric regulating valve to control the steam pressure and make it run smoothly;

[0023] The wastewater constant pressure device uses a pressure sensor to link with an electric regulating valve to control the pressure of the wastewater and make it run smoothly;

[0024] The electric control system is equipped with process control and automation instruments, and is used for the automated operation of an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system.

[0025] In some specific embodiments of the present invention, the steam pressure stabilizing device is arranged on a pipeline used to connect the steam heating network and the primary heating tank or the maintenance tank; the wastewater pressure stabilizing device is arranged on a pipeline used to connect the water outlet of the last maintenance tank of the maintenance tank unit and the water inlet of the heat medium channel of the heat exchanger.

[0026] In some specific embodiments of the present invention, the first-stage heating tank and the bottom of the maintenance tank of the maintenance tank unit are both connected to the tank bottom stirring and heating pipeline. The tank bottom stirring and heating pipeline inputs steam into the tank from the bottom of the tank, which can stir the wastewater in the tank, thereby preventing the suspended matter in the wastewater from settling and causing blockage.

[0027] In some specific embodiments of the present invention, the primary heating tank and the maintenance tank of the maintenance tank unit are respectively provided with a temperature sensor and a steam regulating valve for controlling the wastewater temperature in the wastewater channel.

[0028] In some specific embodiments of the present invention, the structure of the wastewater collection tank can adopt a stainless steel water tank or a reinforced concrete pool.

[0029] The present invention also provides an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process, comprising the following steps: oxytetracycline hydrochloride and streptomycin sulfate wastewater enters the heat exchanger through the refrigerant channel inlet of the heat exchanger, and the temperature of the wastewater passing through the heat exchanger at the refrigerant channel outlet is raised to T2; the water outlet of the refrigerant channel enters the first-level heating tank through the wastewater channel inlet of the first-level heating tank, a large amount of steam is introduced into the steam channel of the first-level heating tank to heat the wastewater to T3, the heated wastewater is discharged through the wastewater channel outlet of the first-level heating tank, and then enters the maintenance tank unit through the wastewater channel inlet of the maintenance tank unit, steam is introduced into the steam channel of the maintenance tank of the maintenance tank unit to heat the wastewater, so that the wastewater temperature is always maintained at not less than T4; then the water outlet of the last wastewater channel outlet of the maintenance tank unit enters the heat medium channel of the heat exchanger through the heat medium channel inlet of the heat exchanger, and the wastewater temperature is reduced after passing through the heat exchanger, and after being discharged through the heat medium channel outlet of the heat exchanger, it enters the subsequent sewage treatment unit.

[0030] In some specific embodiments of the present invention, 80°C≤T2≤90°C, 110°C≤T3≤120°C, and T4=110°C.

[0031] In some specific embodiments of the present invention, the hydraulic retention time HRT of the primary heating tank and the maintenance tank unit is ≥ 1 hour.

[0032] Compared with the prior art, the present invention has the following significant advantages and effects:

[0033] (1) Highly targeted, improving the biodegradability of wastewater

[0034] The present invention is particularly aimed at the wastewater of oxytetracycline hydrochloride and streptomycin sulfate fermentation liquid, and greatly reduces its inhibitory effect on microorganisms through pretreatment, significantly improves the biodegradability of the wastewater, and creates favorable conditions for subsequent biochemical treatment.

[0035] (2) Use clean energy to avoid secondary pollution

[0036] The use of steam as clean energy for pretreatment avoids the problems of large dosage of chemicals, high salinity in wastewater, large sludge production and secondary environmental pollution in traditional technologies, thus achieving green and environmentally friendly treatment.

[0037] (3) No need to add external chemicals, simplifying the process

[0038] There is no need to add acids, salts, oxidants, flocculants and other chemicals, which saves the steps of chemical storage, preparation and addition, and reduces equipment investment and operating costs.

[0039] (4) Reduce sludge generation and lower disposal costs

[0040] No additional sludge is generated during the pretreatment process, thus avoiding the high cost of sludge disposal in traditional technologies.

[0041] (5) Low risk of equipment corrosion and long service life

[0042] Since there is no need to use strong acids or strong oxidants, the equipment avoids acidic or oxidative corrosion, prolongs its service life and reduces maintenance costs.

[0043] (6)Automated operation, high stability

[0044] The system can adopt automatic control, the operation process is stable, human intervention is reduced, and processing efficiency and reliability are improved.

[0045] (7) Clean and environmentally friendly, with low resource consumption

[0046] Compared with traditional pretreatment technology, the present invention only requires an appropriate amount of alkali to adjust the pH value and steam heating, with less resource consumption. The overall process is clean and environmentally friendly, meeting the requirements of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Attached Figure 1 This is a schematic diagram of the structure of an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention and should not be used to limit the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0050] Example 1: An efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system

[0051] An efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system mainly includes a wastewater collection tank, a heat exchanger, a primary heating tank, a primary maintenance tank, a secondary maintenance tank, and a tertiary maintenance tank which are sequentially connected in the direction of the wastewater treatment process. A lifting water pump is arranged between the wastewater collection tank and the heat exchanger. The wastewater collection tank is used to collect yeast liquid wastewater in oxytetracycline hydrochloride and streptomycin sulfate wastewater, and send it to the heat exchanger by the lifting water pump. The structure of the heat exchanger adopts a spiral plate heat exchanger that is not easy to be blocked. The heat exchanger is provided with a refrigerant channel and a hot medium channel; the first-level heating tank, the first-level maintenance tank, the second-level maintenance tank and the third-level maintenance tank are all provided with a steam heating system, the steam heating system includes a temperature sensor and a steam regulating valve, the steam heating system includes a wastewater channel and a steam channel, and the steam channel is connected to the steam heat network. When the temperature sensor detects that the temperature is reduced, the steam is replenished in time, and when the required temperature is reached, the steam replenishment is stopped; the first-level heating tank is used for secondary heating of the wastewater heated by the heat exchanger. The first-level heating tank is the main heating container relative to the maintenance tank, and its internal volume and the caliber of the supporting pipeline are larger than the internal volume and the caliber of the supporting pipeline of the subsequent maintenance tank; the first-level maintenance tank, the second-level maintenance tank and the third-level maintenance tank are all used to ensure that the temperature of the wastewater flowing through is always greater than or equal to 110°C; the first-level maintenance tank, the second-level maintenance tank and the third-level maintenance tank are all vertical containers made of stainless steel, and the outer wall is attached with an insulation layer to prevent the operator from being scalded.

[0052] The outlet of the wastewater collection box is connected with the water inlet of the refrigerant channel of the heat exchanger, the outlet of the refrigerant channel of the heat exchanger is connected with the water inlet of the wastewater channel of the first-level heating tank, the outlet of the wastewater channel of the first-level heating tank is connected with the water inlet of the wastewater channel of the first-level maintenance tank, the outlet of the wastewater channel of the first-level maintenance tank is connected with the water inlet of the wastewater channel of the second-level maintenance tank, the outlet of the wastewater channel of the second-level maintenance tank is connected with the water inlet of the wastewater channel of the third-level maintenance tank, the outlet of the wastewater channel of the third-level maintenance tank is connected with the water inlet of the heat exchanger heat medium channel, and the outlet of the heat exchanger heat medium channel is connected with the subsequent sewage treatment unit.

[0053] The water outlet of the lifting water pump is provided with a temperature sensor, the water outlet of the third-stage maintaining tank is provided with a flow meter and an electric regulating valve, the water outlet of the heat medium channel of the heat exchanger is provided with a temperature sensor, and the air outlet of the steam pressure stabilizing device is provided with an electric regulating valve.

[0054] The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system also includes a steam pressure stabilizing device, a wastewater constant pressure device and an electronic control system; the steam pressure stabilizing device is arranged in the steam heating network, and includes a pressure sensor and an electric regulating valve in the steam pressure stabilizing device, and the pressure sensor and the electric regulating valve are used to stabilize the pressure of the steam sent from the enterprise heating network; the wastewater constant pressure device is arranged in the connecting pipe between the outlet of the wastewater channel of the three-level maintenance tank and the inlet of the heat medium channel of the heat exchanger, and the wastewater constant pressure device includes a pressure sensor and an electric regulating valve. The wastewater passing through the maintenance tank system is controlled by the pressure sensor and the electric regulating valve to achieve the effect of pressure stabilization, so as to protect the heat exchanger from the impact of instantaneous water volume and water pressure, ensure the stable operation of the system, and extend the service life of the heat exchanger; the electronic control system interlocks the above-mentioned temperature sensors, steam regulating valves and flow meters, and communicates and connects the first, second, third and fourth heating units as well as the steam pressure stabilizing device and the wastewater constant pressure device for the overall automatic operation within the system.

[0055] Example 2: Highly efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process

[0056] The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system of Example 1 is used, and the efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process mainly includes the following steps:

[0057] The wastewater collection tank collects yeast wastewater from oxytetracycline hydrochloride and streptomycin sulfate wastewater, and adjusts the pH value to neutral or weak alkaline (i.e., pH ≥ 7) to prevent equipment corrosion; the lifting water pump transfers the wastewater into the heat exchanger through the water inlet of the heat exchanger refrigerant channel (between the lifting water pump and the wastewater collection tank, a liquid level control form is adopted. When the liquid level in the wastewater collection tank is at a low level, the pump is stopped, and a series of subsequent steam heating and other procedures are stopped at the same time. When the liquid level in the wastewater collection tank is at a high level, the lifting water pump is started, and a series of subsequent steam heating and other procedures are started at the same time). The wastewater passing through the heat exchanger is heated by steam, and the temperature at the outlet of the refrigerant channel rises to 80-90°C; the water outlet of the refrigerant channel enters the first-level heating tank through the water inlet of the first-level heating tank wastewater channel, and a large amount of steam is introduced into the steam channel of the first-level heating tank to heat the wastewater to 110°C-120°C. The heated wastewater is discharged through the water outlet of the first-level heating tank wastewater channel, and then passes through the first-level maintenance The water inlet of the wastewater channel of the holding tank enters the first-level maintenance tank, and steam is passed into the steam channel of the first-level maintenance tank to heat the wastewater, so that the temperature of the wastewater is always maintained at not less than 110°C; the water out of the water outlet of the wastewater channel of the first-level maintenance tank enters the second-level maintenance tank through the water inlet of the wastewater channel of the second-level maintenance tank, and steam is passed into the steam channel of the second-level maintenance tank to heat the wastewater, so that the temperature of the wastewater is always maintained at not less than 110°C; the water out of the water outlet of the wastewater channel of the second-level maintenance tank enters the third-level maintenance tank through the water inlet of the wastewater channel of the third-level maintenance tank, and steam is passed into the steam channel of the third-level maintenance tank to heat the wastewater, so that the temperature of the wastewater is always maintained at not less than 110°C; the water out of the water outlet of the wastewater channel of the third-level maintenance tank enters the heat medium channel of the heat exchanger through the water inlet of the heat exchanger heat medium channel, and after passing through the heat exchanger, the temperature of the wastewater is reduced to about 60°C, and after being discharged through the water outlet of the heat medium channel of the heat exchanger, it enters the subsequent sewage treatment unit.

[0058] The hydraulic retention time HRT of the primary heating tank, primary maintenance tank, secondary maintenance tank and tertiary maintenance tank system is ≥1 hour. The organic matter with higher biological value in the wastewater will undergo hydrolysis reaction under the heating of the primary heating tank, primary maintenance tank, secondary maintenance tank and tertiary maintenance tank, the chemical chain will be broken, the large molecules will become small molecules, the complex groups will become simple groups, and the overall biodegradability of the wastewater will be improved.

[0059] The above-mentioned specific implementations are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific implementations. Any appropriate changes or modifications made to them by ordinary technicians in the technical field that conform to the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. An efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system, characterized by: It includes a heat exchanger, a primary heating tank and a maintenance tank unit connected in sequence according to the direction of the wastewater treatment process; The maintenance tank unit comprises at least one maintenance tank; The primary heating tank and the maintenance tank are both provided with a steam heating system, and the steam heating system comprises a wastewater channel and a steam channel, and the steam channel is connected to the steam heating network; The wastewater channel outlet of the primary heating tank is connected to the wastewater channel inlet of the adjacent maintenance tank; The primary maintenance tank is used to perform secondary heating on the wastewater after being heated by the heat exchanger; The maintenance tank unit is used to ensure that the temperature of the wastewater flowing through is always greater than or equal to T1; The heat exchanger is provided with a refrigerant channel and a heat medium channel; The water inlet of the refrigerant channel is used for the inlet of wastewater, and the water outlet of the refrigerant channel is connected with the water inlet of the wastewater channel of the primary heating tank; The water inlet of the heat medium channel is communicated with the water outlet of the wastewater channel of the adjacent maintenance tank, and the water outlet of the heat medium channel is communicated with the subsequent sewage treatment unit.

2. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system according to claim 1, characterized in that: T1≥110℃。 3. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system according to claim 1, characterized in that: The maintenance tank unit includes three maintenance tanks.

4. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system according to claim 1, characterized in that: It also includes a wastewater collection tank and a lift pump; The water outlet of the wastewater collection box is connected to the water inlet of the refrigerant channel of the heat exchanger; The wastewater collection box is used to collect oxytetracycline hydrochloride and streptomycin sulfate wastewater, and the lifting water pump is used to send the oxytetracycline hydrochloride and streptomycin sulfate wastewater to the refrigerant channel of the heat exchanger.

5. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system according to claim 1, characterized in that: It also includes a steam pressure stabilizing device, a wastewater pressure stabilizing device and an electronic control system; The steam pressure stabilizing device includes a pressure sensor and an electric regulating valve, which are linked to each other to control the steam pressure and make it run smoothly; The wastewater constant pressure device includes a pressure sensor and an electric regulating valve, which are linked to each other to control the pressure of the wastewater and make it run smoothly; The electric control system is equipped with process control and automation instruments, and is used for the automated operation of an efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system.

6. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment system according to claim 1, characterized in that: The bottoms of the primary heating tank and the maintenance tank unit are both connected to the tank bottom stirring and heating pipeline.

7. An efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process, characterized in that: The steps include: Oxytetracycline hydrochloride and streptomycin sulfate wastewater enters the heat exchanger through the refrigerant channel inlet of the heat exchanger. The temperature of the wastewater passing through the heat exchanger at the refrigerant channel outlet rises to T2; the water outlet from the refrigerant channel outlet enters the first-level heating tank through the wastewater channel inlet of the first-level heating tank, and a large amount of steam is introduced into the steam channel of the first-level heating tank to heat the wastewater to T3. The heated wastewater is discharged through the wastewater channel outlet of the first-level heating tank, and then enters the maintenance tank unit through the wastewater channel inlet of the maintenance tank unit. Steam is introduced into the steam channel of the maintenance tank of the maintenance tank unit to heat the wastewater so that the temperature of the wastewater is always maintained at not less than T4; then the water outlet of the wastewater channel outlet of the last maintenance tank of the maintenance tank unit enters the heat medium channel of the heat exchanger through the heat medium channel inlet of the heat exchanger. After passing through the heat exchanger, the temperature of the wastewater is reduced, and after being discharged through the heat medium channel outlet of the heat exchanger, it enters the subsequent sewage treatment unit.

8. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process according to claim 7, characterized in that: 80℃≤T2≤90℃, 110℃≤T3≤120℃, T4=110℃.

9. The efficient and environmentally friendly oxytetracycline hydrochloride and streptomycin sulfate wastewater pretreatment process according to claim 7, characterized in that: The hydraulic retention time HRT of the primary heating tank and the maintenance tank unit is ≥ 1 hour.

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