CN-119349776-B - Microorganism-loaded activated carbon composition, nitrile-containing wastewater pretreatment process and device

CN119349776BCN 119349776 BCN119349776 BCN 119349776BCN-119349776-B

Abstract

The invention discloses an activated carbon composition loaded with microorganisms, and a nitrile-containing wastewater pretreatment process, a nitrile-containing wastewater pretreatment device and a nitrile-containing wastewater pretreatment device, and belongs to the technical field of microorganism culture and sewage treatment devices. Aiming at the technical problems that when the prior art is used for preprocessing nitrile-containing wastewater by adopting an electrocatalytic internal circulation aeration biological filter, the electric conductivity and the biodegradation efficiency of biological fillers are poor, and the biodegradability of the wastewater is only improved, and the organic nitrile cannot be converted into a usable substrate, the invention provides an active carbon composition loaded with microorganisms, which comprises active carbon loaded with the Shewanella ornida or the rhodococcus turbidi in a mass ratio of 1:2-1:3, wherein the quantity of the active carbon is 10 9 ～10 10 CFU/g, and the composition has good electric conductivity and biodegradation efficiency. The invention also provides a nitrile-containing wastewater pretreatment process and a nitrile-containing wastewater pretreatment device, which comprise the steps of introducing the nitrile-containing wastewater into the device body, and sequentially using electric treatment and micro-nano bubble generator treatment.

Inventors

JIANG BICUN
WANG QIANG
Tao Hujin
QU JINYUN
QIU YU
XIE SHITAO

Assignees

南京环保产业创新中心有限公司

Dates

Publication Date: 20260512
Application Date: 20241115

Claims (7)

1. A nitrile-containing wastewater pretreatment process is characterized in that a nitrile-containing wastewater pretreatment device is used: the device comprises a device body (1), wherein an anode (4) and a cathode (5) which are arranged in parallel are arranged in the device body (1), and the anode (4) and the cathode (5) are connected through a power supply (6); An active carbon composition (7) loaded with microorganisms is filled between the anode (4) and the cathode (5), and a micro-nano bubble generator (8) is also arranged in the device body (1); The microorganism-loaded activated carbon composition (7) comprises an active carbon loaded with the Shewanella ornida and an active carbon loaded with the rhodococcus turbidentis, wherein the mass ratio of the active carbon loaded with the Shewanella ornida to the active carbon loaded with the rhodococcus turbidentis is 1:2-1:3; The number of the Shewanella on the Ornidazole lake is 10 9 ~10 10 CFU/g, and the number of the rhodococcus turbidimetus is 10 9 ~10 10 CFU/g; the Shewanella ornida is SHEWANELLA ONEIDENSIS deposited with China center for industry microbiological culture collection with a deposit number of CICC 25104, and the rhodococcus turbidi, rhodococcus opacus is deposited with a American type culture Collection with a deposit number of ATCC 51882; The method comprises the following steps: s1, introducing nitrile-containing wastewater into the device body (1), switching on the power supply (6), and keeping the micro-nano bubble generator (8) closed; S2, turning off the power supply (6), and starting the micro-nano bubble generator (8) to operate; S3, closing the micro-nano bubble generator (8), and standing for precipitation.
2. The nitrile-containing wastewater pretreatment process of claim 1, wherein the particle size of the activated carbon loaded with the Shewanella on the Ornida lake is 5-10 mm, and the particle size of the activated carbon loaded with the rhodococcus turbidimetus is 2-6 mm.
3. The pretreatment process for wastewater containing nitrile according to claim 1, wherein the filling volume of the activated carbon composition (7) loaded with microorganism is 1/2-2/3 of the volume of the device body (1).
4. The pretreatment process for wastewater containing nitrile according to claim 1, wherein in step S1, the current density on the anode (4) and the cathode (5) is controlled to be 7-15 mA/cm 2 .
5. The pretreatment process for wastewater containing nitrile according to claim 1, wherein in step S2, the particle size of micro-nano bubbles generated by the micro-nano bubble generator (8) is 50-100 μm.
6. The pretreatment process for wastewater containing nitrile according to claim 1, wherein in the step S3, the time of standing and precipitating is not less than 5 min.
7. The pretreatment process of wastewater containing nitrile according to any one of claims 4 to 6, wherein the hydraulic retention time is controlled to 7 to 8 hours, the pH value is controlled to 7.2 to 7.8 during operation, and the operating temperature is controlled to 26 to 30 ℃.

Description

Microorganism-loaded activated carbon composition, nitrile-containing wastewater pretreatment process and device Technical Field The invention belongs to the technical field of sewage treatment devices, and particularly relates to an activated carbon composition loaded with microorganisms, and a nitrile-containing wastewater pretreatment process and device. Background The nitrile-containing chemical wastewater refers to wastewater generated in the chemical production process, in particular to the production process of organic nitrile compounds such as acrylic fiber production or acrylonitrile and the like. Such waste water contains a large amount of organic nitrile compounds such as acrylonitrile, acetonitrile, acrylonitrile oligomers, etc. The treatment of nitrile-containing chemical wastewater faces a number of problems (1) biostatic toxicity, namely that organic nitrile compounds have a strong inhibitory effect on microorganisms, and even low concentrations of nitrile compounds can significantly affect the activity of microorganisms, which limits the application of biological treatment techniques. (2) The organic matters in the nitrile-containing wastewater have complex structures, are difficult to degrade by a conventional biological treatment method, and need pretreatment to improve the biodegradability. (3) The treatment efficiency is low, and the traditional physical, chemical and biological treatment methods often cannot effectively remove pollutants in the nitrile-containing wastewater, so that the treatment efficiency is low. (4) Cost and operation complexity, and high efficiency treatment technologies such as membrane treatment technology, although good in treatment effect, high in operation cost and high in energy consumption limit the wide application of the technology in sewage treatment in chemical plants. (5) Anaerobic microorganisms are extremely sensitive to environmental conditions such as pH, temperature, toxicity and the like, malodorous gases can be generated in the treatment process, and an anaerobic treatment system has certain requirements on the biodegradability of wastewater, while the biodegradability of nitrile-containing wastewater is often poor. The method for treating the nitrile-containing chemical wastewater mainly comprises the following steps of (1) a chemical oxidation method for oxidizing and decomposing organic nitrile compounds in the wastewater by adding an oxidant (such as hydrogen peroxide, ozone, liquid chlorine and the like). The disadvantage is the high cost and the possibility of large amounts of chemical sludge. (2) Physical treatment methods include filtration, gravity precipitation, air floatation and the like. The process is simple, the management is convenient, but the soluble wastewater component can not be effectively removed, and the method has great limitation. (3) In the electrochemical oxidation method, organic pollutants in the wastewater are removed by oxidation-reduction reaction on an electrode in an electrolytic tank. Has the problems of high energy consumption, high cost, side reaction and the like. (4) Biological methods include SBR method, biological contact oxidation method, aerobic biochemical method, acidification pretreatment, biological filtration and addition of special strains. The content of organic matters in the wastewater can be reduced, the biodegradability of the wastewater is improved, but the degradation capability of the wastewater on organic nitrile is limited, and the treatment efficiency may not be high. (5) The photocatalytic oxidation technology combines the oxidant with the light radiation by utilizing the light-activated oxidation, and can treat the refractory substances. There may be problems of high equipment cost and complicated operation. (6) The adsorption method, such as activated carbon adsorption, resin adsorption and the like, can effectively remove organic substances in the wastewater. The disadvantage is that regeneration of the adsorbent is difficult and there may be a problem of limited adsorption capacity. (7) The Fenton oxidation method has high treatment efficiency, but needs to add a large amount of reagents, has huge cost consumption, is easy to cause a large amount of chemical sludge, and can not completely degrade a plurality of pollutants to generate a large amount of intermediate products, so that the effluent can not meet the recycling requirement. (8) The electrocatalytic internal circulation aeration biological filter combines a three-dimensional electrode advanced oxidation technology and a biological membrane technology, and can effectively treat industrial wastewater difficult to degrade. However, the equipment investment for this method may be high and the operation and maintenance are complicated. In the method, compared with other methods, the electrocatalytic internal circulation biological aerated filter method has relatively high pollutant removal capacity and relatively high impact loa