CN112851045A - Sulfanilamide wastewater treatment system and method - Google Patents
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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Abstract
The invention provides a sulfanilamide wastewater treatment system and a sulfanilamide wastewater treatment method, wherein the system comprises a regulating sedimentation tank, a filter, an absorber, an electrocatalytic oxidation device, a biological reaction zone and a sedimentation tank II which are sequentially connected, and the filter is simultaneously communicated with a dosing device; the method comprises the following steps: introducing the sulfanilamide wastewater into an adjusting sedimentation tank for sedimentation, and carrying out homogenization and uniform treatment; adjusting the pH value; filtering; performing adsorption treatment and electrocatalytic oxidation treatment on the waste liquid by using a resin adsorber; carrying out anoxic biological reaction treatment on the obtained waste liquid, and then carrying out aerobic biological reaction treatment; and discharging after sedimentation and disinfection. The invention has the following advantages: the shock resistance load is strong, and the operation and the control are simple and convenient; sulfanilamide in the wastewater can be recovered, the system is stable and reliable in operation, and secondary pollution can not be caused; the purification effect is good, the effluent quality is good, and the requirements of the national sewage comprehensive discharge standard are met.
Description
Technical Field
The invention relates to the technical field of sulfanilamide wastewater treatment, and particularly relates to a sulfanilamide wastewater treatment system and a sulfanilamide wastewater treatment method.
Background
Sulfanilamide is an important chemical pharmaceutical raw material, is an important intermediate of sulfanilamide medicaments, and can be used for producing various sulfanilamide medicaments such as sulfadiazine, sulfathiazole, sulfapyridine, sulfaguanidine, phthaloyl sulfathiazole, sulfadimidine and the like. Sulfonamides are the earliest class of artificially synthesized macromolecular antibiotics, mainly aim at pathogenic bacteria in human bodies and animal bodies, have the advantages of strong curative effect, wide antibacterial spectrum, safety, convenience and the like, and are mainly used for treating diseases caused by various bacterial infections. The waste water discharged in the production process of sulfanilamide mainly comes from the working procedures of sulfonation, one-minute and two-minute, ammonolysis, neutralization crystallization and the like, has the characteristics of high salinity, high organic matter concentration, high sulfur content and the like, contains sulfanilamide and intermediates thereof, is difficult to degrade and has certain toxicity to microorganisms.
The prior method for treating sulfanilamide wastewater mainly comprises an adsorption method, a wet catalytic oxidation method, a Fenton method, an ozone oxidation method and a biodegradation method. The Fenton method has the characteristics of difficult control, strong corrosivity and high cost in practical application due to the limitation of medicament transportation and strong corrosivity; the ozone oxidation method does not utilize popularization and application due to the defects of large power consumption and high cost of the ozone generator; the wet catalytic oxidation method has strict working conditions for treating the sulfanilamide production wastewater and higher treatment cost; when the traditional activated sludge method is used for treatment, the organic matter concentration in the wastewater is high, the dilution water requirement is large, and the effluent quality is difficult to reach the standard. More importantly, the high Concentration (COD) is treated by the existing industrial methodCrNot less than 10000mg/L) sulfanilamide waste water has the problems of harsh operating conditions, unstable operation process, higher treatment cost, easy secondary pollution, incomplete waste water purification, difficult achievement of the requirements of the national sewage comprehensive discharge standard and the like.
Disclosure of Invention
The invention aims to provide a sulfanilamide wastewater treatment system which is stable in operation process and simple and convenient to operate and control.
The purpose of the invention is realized by adopting the following technical scheme.
A sulfanilamide effluent disposal system which characterized in that: the device comprises a regulating sedimentation tank, a filter, an absorber, an electrocatalytic oxidation device, a biological reaction zone and a sedimentation tank II which are connected in sequence, wherein the filter is simultaneously communicated with a dosing device.
In order to further improve the sulfanilamide wastewater treatment effect, a grid channel is arranged at the inlet of the adjusting sedimentation tank, and the specification of the grid channel is 5-20 mm.
In order to further improve the sulfanilamide wastewater treatment effect, a pipeline mixer is arranged on a pipeline between the adjusting sedimentation tank and the filter, and a dosing device is connected with the pipeline mixer; the biological reaction zone consists of an anoxic biological reaction zone and an aerobic biological reaction zone, and the aerobic biological reaction zone is connected with an aeration fan.
Preferably, a liquid level meter is arranged in the adjusting sedimentation tank, a waste water lifting pump is arranged on a pipeline between the adjusting sedimentation tank and the filter, an online pH detector is arranged on a pipeline behind the pipeline mixer, an online dissolved oxygen meter is arranged in the aerobic biological reaction zone, and an outlet of the sedimentation tank II is also connected with a clean water tank.
Furthermore, the bottom of the adjusting sedimentation tank is provided with a slope and a mud bucket, and the slope is 15-60 degrees.
The invention also aims to provide a sulfanilamide wastewater treatment method which has the advantages of stable operation process, simple and convenient operation and control, good treatment effect and no secondary pollution, and comprises the following steps:
step 1, introducing sulfanilamide wastewater into a regulating sedimentation tank for sedimentation, and carrying out homogenization and uniform treatment;
step 3, filtering the waste liquid obtained in the step 2;
step 4, adopting a resin adsorber to perform adsorption treatment on the waste liquid obtained in the step 3, wherein the time is controlled to be 10-60 min;
step 5, carrying out electrocatalytic oxidation treatment on the waste liquid obtained in the step 4;
step 6, firstly carrying out anoxic biological reaction treatment on the waste liquid obtained in the step 5, and then carrying out aerobic biological reaction treatment;
and 7, settling the waste liquid obtained in the step 6 again, and discharging the liquid after the settling treatment after disinfection.
Further, in the step 1, the retention time of the waste liquid in the adjusting sedimentation tank is 6-24 hours;
in the step 4, the retention time of the waste liquid in the resin adsorber is 20-40 min;
in step 5, the anode of the electrocatalytic oxidation device adopts titanium-based composite metal oxide or a synthetic boron-doped diamond thin-layer electrode, the cathode adopts a titanium plate, a stainless steel plate or a graphite plate, the voltage of the titanium plate, the stainless steel plate or the graphite plate is 5-15V, and the current density is 10-100 mA/cm2The electrocatalytic oxidation reaction time is 10 min-120 min;
in the step 6, the retention time of the waste liquid in the anoxic biological reaction zone is 2-12h, and the retention time of the waste liquid in the aerobic biological reaction zone is 6-18 h;
and 7, settling the waste liquid in the second sedimentation tank for 10-60min, and controlling the disinfection time to be 15-60 min.
In order to further improve the removal efficiency of the organic matters, in step 6, the dissolved oxygen range of the waste liquid in the aerobic biological reaction zone is controlled to be 2.0-4.0mg/L, and the specific surface area of the aerobic biological reaction zone is more than 800m2/m3The anoxic biological reaction zone is provided with a specific surface area larger than 1100m2/m3The combination of (1).
Furthermore, in order to improve the separation effect of the sludge and the liquid, an inclined plate or an inclined pipe is arranged in the sedimentation tank II.
Preferably, the activated sludge in the aerobic biological reaction zone is adopted to carry out aerobic reaction, and COD, TN and TP are absorbed and degraded by microorganisms.
The scheme of the invention is adopted to treat high-concentration sulfanilamide wastewater, and has the following steps: 1) the shock resistance load is strong, and the operation and the control are simple and convenient; 2) sulfanilamide in the wastewater can be recovered, the system is stable and reliable in operation, and secondary pollution cannot be caused; 3) the purification effect is good, the effluent quality is good, the quality of the treated wastewater reaches the first-class standard (COD is less than or equal to 100mg/L) of the Integrated wastewater discharge Standard (GB 8978 + 1996), and the requirement of the national Integrated wastewater discharge Standard is met.
In the scheme of the invention, the front end of the device adopts physicochemical treatment, and technological operation parameters can be flexibly adjusted according to the concentration of inlet water (if a regulating sedimentation tank is arranged at the front section, the device can homogenize the water quantity and the water quality of wastewater, and can adjust the time interval between the filtration and the backwashing of a filter, the time interval between the adsorption and the regeneration of a resin adsorber, the technological parameter adjustment operations of the working voltage, the current density and the like of an electrocatalytic oxidation device and the like), thereby adapting to the influence of the impact load of the wastewater; through the front-stage physicochemical treatment, the concentration of the wastewater entering the subsequent biochemical treatment system is kept relatively stable, meanwhile, the biochemical property of the wastewater is improved, and the stable operation of the subsequent biochemical system is ensured.
Drawings
FIG. 1 is a schematic diagram of a sulfanilamide wastewater treatment system in the example.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the following embodiments are only used for understanding the principle of the present invention and the core idea thereof, and do not limit the scope of the present invention. It should be noted that modifications to the solution made by a person skilled in the art without departing from the principle of the invention also fall within the scope of protection of the claims of the present invention.
Examples
Referring to fig. 1, a sulfanilamide wastewater treatment system comprises a regulation sedimentation tank 2, a pipeline mixer 5, a filter 8, an adsorber 9, an electrocatalytic oxidation device 10, a biological reaction zone and a sedimentation tank II 15 which are connected in sequence, wherein the pipeline mixer 5 is simultaneously communicated with a dosing device 7. A grating channel 1 is arranged at the inlet of the adjusting sedimentation tank 2, and the specification of the grating channel 1 is 5-20 mm. A pipeline mixer 5 is arranged on a pipeline between the adjusting sedimentation tank 2 and the filter 8, and a dosing device 7 is connected with the pipeline mixer 5; the biological reaction zone consists of an anoxic biological reaction zone 11 and an aerobic biological reaction zone 12, and the aerobic biological reaction zone 12 is connected with an aeration fan 14. A liquid level meter 3 is arranged in the adjusting sedimentation tank 2, a waste water lifting pump 4 is arranged on a pipeline between the adjusting sedimentation tank 2 and the filter 8, an online pH detector 6 is arranged on a pipeline behind the pipeline mixer 5, an online dissolved oxygen meter 13 is arranged in the aerobic biological reaction zone 12, and the outlet of the sedimentation tank II 15 is also connected with a clean water tank 16. The bottom of the adjusting sedimentation tank 2 and/or the sedimentation tank II 15 is provided with a slope and a mud bucket, and the slope is 15-60 degrees.
The steps for treating the high-concentration sulfanilamide wastewater are as follows:
step 1, adjusting precipitation: the collected sulfanilamide wastewater is blocked by a fine grid (grid channel 1) to remove larger impurities and larger particle suspended matters in the wastewater, then enters an adjusting sedimentation tank 2 and stays for 6-24 hours, solid particles in the sulfanilamide wastewater are settled down, the first solid-liquid separation is carried out, and meanwhile, the sulfanilamide wastewater is homogenized and equalized and then enters the next step for treatment;
and step 3, filtering: filtering the waste liquid obtained in the step 2 in a filter 8, and filtering to remove particulate matters in the waste liquid; the filter 8 can be a quartz sand filter or a laminated self-cleaning filter;
step 4, resin adsorption: performing adsorption treatment on the waste liquid obtained in the step 3 for 10-60min (preferably 20-40min) by using a resin adsorber, wherein the adsorption resin has a good adsorption-desorption effect on sulfanilamide, the waste liquid passes through the resin adsorber to adsorb sulfanilamide substances in the waste liquid, CODcr in the waste water is removed, and after the resin adsorber is saturated in adsorption, sulfanilamide in the waste water can be recovered by desorption; wherein, the adsorption resin can adopt nonpolar or middle polar adsorption resin, and a spare resin adsorber is arranged, when the working resin adsorber needs to be resolved after being adsorbed and saturated, the spare resin adsorber can be put into operation;
step 5, electrocatalytic oxidation: carrying out electrocatalytic oxidation treatment on the waste liquid obtained in the step (4), allowing the sulfanilamide waste liquid subjected to resin adsorption treatment to enter an electrocatalytic oxidation device 10, and generating hydroxyl radicals (. OH) or other free radicals and radicals with strong oxidation capacity through an electrochemical process by utilizing a metal oxide electrode with catalytic performance to attack organic matters in the waste water solution so as to decompose the organic matters into carbon dioxide, water and simple organic matters, thereby reducing or eliminating the toxicity of the sulfanilamide waste liquid to microorganisms and improving the biodegradability of the waste liquid;
wherein the pH value of the waste liquid entering the electrocatalytic oxidation device 10 is 5.0-8.0, the anode of the electrocatalytic oxidation device 10 adopts titanium-based composite metal oxide or a synthetic boron-doped diamond thin-layer electrode, the cathode adopts a titanium plate, a stainless steel plate or a graphite plate, the voltage is controlled to be 5-15V, and the current density is controlled to be 10-100 mA/cm2The electrocatalytic oxidation reaction time is controlled to be 10 min-120 min;
step 6, carrying out anoxic biological reaction treatment on the waste liquid obtained in the step 5, and then carrying out aerobic biological reaction treatment;
the organic matter which is difficult to degrade and is left in the waste liquid is removed through anoxic biological reaction, the removal efficiency of the organic matter is improved, and the organic matter in the waste liquid solution is degraded through a large number of anoxic biological strains, so that the organic matter which is difficult to degrade is decomposed into carbon dioxide, water and simple organic matter, and the biodegradability of the waste water is further improved; the anoxic biological reaction zone 11 is provided with a combined filler meeting the process requirements, and the specific surface area of the combined filler is more than 1100m2/m3The waste water stays for 2-12h, because the specific surface area of the combined filler is large, a large number of anoxic biological strains can be attached, and the anoxic biological strains can consume a small amount of dissolved oxygen brought by sewage inflow in the metabolism process and can simultaneously carry out nitrification and denitrification, so that part of organic matters which are difficult to degrade can be effectively removed, the removal efficiency of the organic matters is improved, the energy consumption is saved, and the biological denitrification efficiency is improved;
organic matters in the waste liquid are further removed through aerobic biological reaction, and COD, TN and TP are absorbed and degraded by microorganisms in the activated sludge of the aerobic biological reaction zone 12So that the wastewater can reach the standard and be discharged; the aerobic biological reaction zone 12 is provided with a combined filler meeting the process requirements, and the specific surface area of the combined filler is more than 800m2/m3The arranged aeration fan can provide sufficient oxygen for the aerobic biological reaction zone 12; an online dissolved oxygen instrument 13 is arranged in the aerobic biological reaction zone 12, the dissolved oxygen range of the wastewater in the aerobic biological reaction zone 12 is controlled to be 2.0-4.0mg/L, and the online dissolved oxygen instrument 13 is connected with a control system linkage aeration fan to perform online monitoring and control on the dissolved oxygen in the aerobic biological reaction zone 12;
and 7, settling separation: carrying out sedimentation treatment on the waste liquid obtained in the step 6 for 10-60min again, and carrying out sedimentation solid-liquid separation in a sedimentation tank II 15 to separate sludge from liquid; an inclined plate or an inclined pipe is arranged in the second sedimentation tank 15;
The three groups of high-concentration sulfanilamide wastewater are treated by adopting the scheme in the embodiment, the control conditions and the treatment results are shown in the table 1,
TABLE 1 high concentration sulfanilamide wastewater treatment
| Group 1 | |
Group 3 | |
| COD in sulfanilamide wastewatercrConcentration mg/L | 11056 | 15732 | 13261 |
| In |
6.8 | 7.2 | 7.3 |
| COD of waste water after passing through resin adsorbercrConcentration mg/L | 3648 | 3933 | 3845 |
| Operating voltage V of electrocatalytic oxidation device | 10 | 12 | 11 |
| Current density mA/cm of electrocatalytic oxidation device2 | 50 | 70 | 60 |
| COD in waste water after electrocatalytic oxidationcrConcentration mg/L | 620 | 708 | 692 |
| Residence time h of anoxic |
8 | 12 | 10 |
| COD in wastewater after anoxic reactioncrConcentration mg/L | 496 | 538 | 511 |
| The retention time h of the aerobic biological reaction zone | 12 | 16 | 14 |
| COD of treated effluentcrConcentration mg/L | 74 | 67 | 72 |
Therefore, the scheme in the embodiment is adopted to treat high-concentration sulfanilamide wastewater, the purification effect is good, the effluent quality is good, the CODcr concentration of the treated effluent can reach 67-74 mg/L, and the requirement of the national comprehensive sewage discharge standard is met.
Claims (9)
1. A sulfanilamide effluent disposal system which characterized in that: the device comprises a regulating sedimentation tank, a filter, an absorber, an electrocatalytic oxidation device, a biological reaction zone and a sedimentation tank II which are connected in sequence, wherein the filter is simultaneously communicated with a dosing device.
2. The sulfanilamide wastewater treatment system of claim 1, wherein: a grating channel is arranged at the inlet of the adjusting sedimentation tank, and the specification of the grating channel is 5-20 mm.
3. The sulfanilamide wastewater treatment system of claim 2, wherein: a pipeline mixer is arranged on a pipeline between the adjusting sedimentation tank and the filter, and the dosing device is connected with the pipeline mixer; the biological reaction zone consists of an anoxic biological reaction zone and an aerobic biological reaction zone, and the aerobic biological reaction zone is connected with an aeration fan.
4. The sulfanilamide wastewater treatment system of claim 3, wherein: a liquid level meter is arranged in the adjusting sedimentation tank, a waste water lift pump is arranged on a pipeline between the adjusting sedimentation tank and the filter, an online pH detector is arranged on a pipeline behind the pipeline mixer, an online dissolved oxygen meter is arranged in the aerobic biological reaction area, and a clean water tank is also connected with the outlet of the sedimentation tank.
5. The sulfanilamide wastewater treatment system of claim 4, wherein: the bottom of the adjusting sedimentation tank is provided with a slope and a mud bucket, and the slope is 15-60 degrees.
6. The method of treating a sulfonamide wastewater treatment system of any of claims 1-5, wherein the steps comprise:
step 1, introducing sulfanilamide wastewater into a regulating sedimentation tank for sedimentation, and carrying out homogenization and uniform treatment;
step 2, adjusting the pH value of the waste liquid obtained in the step 1 to 4.0-9.0;
step 3, filtering the waste liquid obtained in the step 2;
step 4, adopting a resin adsorber to perform adsorption treatment on the waste liquid obtained in the step 3, wherein the time is controlled to be 10-60 min;
step 5, carrying out electrocatalytic oxidation treatment on the waste liquid obtained in the step 4;
step 6, firstly carrying out anoxic biological reaction treatment on the waste liquid obtained in the step 5, and then carrying out aerobic biological reaction treatment;
and 7, settling the waste liquid obtained in the step 6 again, and discharging the liquid after the settling treatment after disinfection.
7. The process of claim 6, wherein:
in the step 1, the retention time of the waste liquid in the adjusting sedimentation tank is 6-24 hours;
in the step 4, the retention time of the waste liquid in the resin adsorber is 20-40 min;
in step 5, the anode of the electrocatalytic oxidation device adopts titanium-based composite metal oxide or a synthetic boron-doped diamond thin-layer electrode, the cathode adopts a titanium plate, a stainless steel plate or a graphite plate, the voltage of the titanium plate, the stainless steel plate or the graphite plate is 5-15V, and the current density is 10-100 mA/cm2The electrocatalytic oxidation reaction time is 10-120 min;
in the step 6, the retention time of the waste liquid in the anoxic biological reaction zone is 2-12h, and the retention time of the waste liquid in the aerobic biological reaction zone is 4-18 h;
and 7, settling the waste liquid in the second sedimentation tank for 10-60min, and controlling the disinfection time to be 15-60 min.
8. The process of claim 7, wherein:
in step 6, the dissolved oxygen range of the waste liquid in the aerobic biological reaction zone is controlled to be 2.0-4.0mg/L, and the specific surface area of the aerobic biological reaction zone is more than 800m2/m3The anoxic biological reaction zone is provided with a specific surface area larger than 1100m2/m3The combination of (1).
9. The process of claim 8, wherein: and carrying out aerobic reaction by adopting activated sludge in an aerobic biological reaction zone, and absorbing and degrading COD, TN and TP by utilizing microorganisms.
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Application publication date: 20210528 |