CN219384935U - Wastewater treatment system for fibrous membrane production workshop - Google Patents

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment system of a fiber membrane production workshop, which comprises the following components in sequence: the device comprises an adjusting tank, a primary multi-element electrocatalytic oxidation device, a primary biochemical system, a middle water tank, a secondary multi-element electrocatalytic oxidation device, a secondary biochemical system and a clean water tank; the primary biochemical system comprises a first anoxic tank, a first aerobic tank and a first MBR tank which are sequentially arranged, and a microbial inoculum adding port is arranged on the first aerobic tank; the second-stage biochemical system comprises a second anoxic tank, a second aerobic tank and a second MBR tank, and a microbial inoculum adding port is arranged on the second aerobic tank. The whole treatment system has strong impact resistance, small occupied area, low cost and stable operation, ensures that the wastewater in the fiber membrane production workshop can reach the discharge standard through the synergistic effect of two-stage multielement electrocatalytic oxidation and two-stage biochemical treatment, and can effectively solve the problems of high concentration of pollutants and high toxicity in the wastewater in the fiber membrane production workshop.

Description

Wastewater treatment system for fibrous membrane production workshop

Technical Field

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment system of a fiber membrane production workshop.

Background

The waste water in the production of the fiber membrane workshop mainly originates from coagulation bath waste water, silk soaking groove waste water, glycerol protection process waste water, ground flushing water and the like, and the main pollutants of the waste water are DMAC, DMF and glycerol, so that the waste water has high pollutant concentration, high toxicity, stable chemistry and difficult treatment, and is typical high-concentration organic waste water difficult to treat.

At present, pretreatment methods such as iron-carbon electrolysis, fenton oxidation, ozone catalytic oxidation, adsorption, photocatalytic oxidation and the like are mostly adopted at home and abroad to treat DMAC and DMF wastewater, and the methods often have poor treatment effect or high operation cost. Li Jie et al (Li Jie, man, professor, lanzhou university, research on pretreatment of DMAC wastewater by iron-carbon micro-electrolysis coupling Fenton reagent-coagulating sedimentation process, river subject "river basin industry point source water pollution control technology", seminar & treatise on the treatment of DMAC wastewater by iron-carbon electrolysis-Fenton reagent-primary MBR process), wherein the removal rate of COD of treated effluent can be stabilized to be more than 70% under the optimal process condition; auxiliary chromophore-CH of DMAC after microelectrolysis ₃ And C=O is destroyed, after Fenton oxidation, the-NH-group can be destroyed, and the macromolecular substances in the wastewater are destroyed and finally converted into micromolecular substances. However, the process adopts iron-carbon electrolysis, equipment is easy to harden during engineering operation, and a large amount of H is needed to be added during operation due to the large slag amount of the Fenton oxidation process ₂ O ₂ The operation cost is high. Silver jade capacity and the like (DMAC wastewater is treated by combining activated carbon fiber adsorption and internal iron carbon electrolysis, and environmental engineering, volume 36, journal 2018) adopt the DMAC wastewater which is treated by combining activated carbon fiber adsorption and internal iron carbon electrolysis, and under the optimal process condition, the total removal rate of COD of effluent after combined treatment can reach about 50 percent, but the activated carbon fiber adsorption cost is too high to be applied in engineering. Xu Jing et al (isolation, identification and degradation characteristics research of DMAC degrading bacteria, university of Nanjing agricultural university, university of Shuoshi, 2011, 9) found that Pseudomonas DM5 strain could completely degrade 100mg/L of DMAC within 48 hours, but the concentration of DMAC in engineering wastewater was far higher than 100mg/L, and the strain could not directly treat membrane production plant effluent due to concentration limitation. None of the above studies were engineered for use. The Chinese patent application of application number 202011332211.7 discloses an MBR (Membrane biological reactor) fiber membrane wastewater treatment device, which is used for purifying garbage in fiber membrane wastewater by directly adopting an MBR membrane layer after preliminary filtration. The fiber membrane wastewater has poor biodegradability due to high concentration of pollutants, high toxicity and stable chemistry, and the single-stage biochemical treatment effect is poor, so that the emission requirement is far from being met. At present, no engineering case of wastewater treatment in a fiber membrane workshop is found. In this regard, the present application proposes a wastewater treatment process for a fibrous membrane production plant.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides a wastewater treatment system for a fiber membrane production workshop.

The technical scheme of the utility model is realized as follows:

a wastewater treatment system for a fibrous membrane production workshop comprises the following components in sequence: the device comprises an adjusting tank, a primary multi-element electrocatalytic oxidation device, a primary biochemical system, a middle water tank, a secondary multi-element electrocatalytic oxidation device, a secondary biochemical system and a clean water tank; stirring devices are arranged in the regulating tank and the middle water tank;

the primary biochemical system comprises a first anoxic tank, a first aerobic tank and a first MBR tank which are sequentially arranged, a return pipe A is arranged between the first aerobic tank and the first anoxic tank, and a return pipe B and a return pipe C are respectively arranged between the first MBR tank and the first aerobic tank and between the first anoxic tank;

the second-stage biochemical system comprises a second anoxic tank, a second aerobic tank and a second MBR tank, liquid microbial inoculum adding ports are formed in the first aerobic tank and the second aerobic tank, a return pipe E is arranged between the second aerobic tank and the second anoxic tank, and a return pipe D is arranged between the second MBR tank and the second anoxic tank;

an on-line detection system is arranged on the clean water tank, if the clean water tank is detected to be qualified, the clean water tank is directly discharged to the municipal pipeline, and if the clean water tank is not qualified, the clean water tank is refluxed to the middle water tank through a reflux pipe F arranged between the clean water tank and the middle water tank.

Compared with the prior art, the utility model has the advantages that the multi-element electrocatalytic oxidation is arranged in front, most of pollutants can be removed, the toxicity of waste water is reduced, the pressure of a biochemical system is lightened, the residence time of the biochemical system is shortened, and the occupation of land of the biochemical system is reduced; the two-stage multielement electrocatalytic oxidation is used for pretreating wastewater in a fibrous membrane production workshop, so that the impact resistance of the system is strong and the stability is good; through the synergistic effect of two-stage multielement electrocatalytic oxidation and two-stage biochemical treatment, the wastewater in the fiber membrane production workshop can be discharged up to the standard, the problems of high concentration of pollutants and high toxicity in the wastewater in the fiber membrane production workshop can be effectively solved, and the whole system has strong impact resistance, small occupied area, stable operation and relatively low investment cost and operation cost.

Further, the treatment system is particularly suitable for wastewater with the water yield of less than or equal to 200m ³ The pH value of the treated effluent is 6-9, COD is less than or equal to 25000mg/L, ammonia nitrogen is less than or equal to 500mg/L, total nitrogen is less than or equal to 1500mg/L, SS is less than 100mg/L, the treated effluent mainly originates from coagulating bath wastewater, silk soaking tank wastewater, glycerol protection process wastewater, ground flushing water and the like of the fiber film production workshop, the pH value of the treated effluent is 6-9, COD is less than or equal to 500mg/L, BOD and less than or equal to 300mg/L, ammonia nitrogen is less than or equal to 45mg/L, total nitrogen is less than or equal to 70mg/L, total phosphorus is less than or equal to 8mg/L, and the treated effluent can be directly discharged to a municipal pipe network.

Preferably, the first-stage multi-element electrocatalytic oxidation device and the second-stage multi-element electrocatalytic oxidation device are multi-element electrocatalytic oxidation devices produced by the south Innovative (Tianjin) technology development limited company, particle electrodes in the first-stage multi-element electrocatalytic oxidation device are activated carbon-based particle electrodes, the filling amount is 80-90% of the effective volume of the device, particle electrodes in the second-stage multi-element electrocatalytic oxidation device are diatomite and activated carbon-based composite particle electrodes, and the filling amount is 60-70% of the effective volume of the device.

The multielement electrocatalytic oxidation device has been applied for Chinese patent application number: 202223087968.1. when wastewater from a fibrous membrane production plant to be treated flows through the multi-element electrocatalytic oxidation device, a certain amount of hydroxyl free radicals and nascent coagulant can be generated in the device under a certain current condition, pollutants in the wastewater are decomposed through the actions of decomposition, coagulation, adsorption, complexation, replacement and the like, the toxicity of the wastewater is reduced, and the wastewater can enter a biochemical system for treatment.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a wastewater treatment system in a fibrous membrane production plant according to the present utility model.

In the figure: 1. an adjusting tank; 2. a first-stage multi-element electrocatalytic oxidation device; 3. a primary biochemical system; 31. a first anoxic tank; 32. a first aerobic tank; 33. a first MBR tank; 34. a return pipe A; 35. a return pipe B; 36. a return pipe C; 4. a middle pool; 5. a two-stage multi-element electrocatalytic oxidation device; 6. a secondary biochemical system; 61. a second anoxic tank; 62. a second aerobic tank; 63. a second MBR tank; 64. a return pipe D; 65. a return pipe E; 7. a clean water tank; 71. a return pipe F; 8. a blower.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1: a wastewater treatment system for a fibrous membrane production workshop comprises the following components in sequence: the device comprises an adjusting tank 1, a primary multi-element electro-catalytic oxidation device 2, a primary biochemical system 3, an intermediate water tank 4, a secondary multi-element electro-catalytic oxidation device 5, a secondary biochemical system 6, a clean water tank 7 and a fan 8, wherein the primary multi-element electro-catalytic oxidation device 2 and the secondary multi-element electro-catalytic oxidation device 5 are devices shown in Chinese patent application number 202223087968.1; stirring devices are arranged in the regulating tank 1 and the middle water tank 4; the primary biochemical system 3 comprises a first anoxic tank 31, a first aerobic tank 32 and a first MBR tank 33 which are sequentially arranged, a return pipe A34 is arranged between the first aerobic tank 32 and the first anoxic tank 31, and a return pipe B35 and a return pipe C36 are respectively arranged between the first MBR tank 33 and the first aerobic tank 32 and between the first anoxic tank 31; the second-stage biochemical system 6 comprises a second anoxic tank 61, a second aerobic tank 62 and a second MBR tank 63, liquid microbial inoculum adding ports are formed in the first aerobic tank 32 and the second aerobic tank 62, liquid microbial inoculum added in the first aerobic tank 32 and the second aerobic tank 62 is of a preservation number CGMCC No.12585, a return pipe E65 is arranged between the second aerobic tank 62 and the second anoxic tank 61, and a return pipe D64 is arranged between the second MBR tank 63 and the second anoxic tank 61; an on-line detection system is arranged on the clean water tank 7, and a return pipe F71 is arranged between the clean water tank 7 and the intermediate water tank 4.

Working principle: the wastewater to be treated is discharged into a regulating tank 1 through a pipeline, stirred and remained in the regulating tank 1, and pumped into a first-stage multi-element electrocatalytic oxidation device 2 for oxidation treatment, wherein the first-stage multi-element electrocatalytic oxidation device 2 is preferably a device shown in Chinese patent application No. 202223087968.1, an activated carbon-based particle electrode is adopted as a particle electrode in the device, and the filling amount is 80-90% of the effective volume of the device; the effluent of the first-stage multi-element electrocatalytic oxidation device 2 sequentially flows to a first anoxic tank 31, a first aerobic tank 32 and a first MBR tank 33, wherein the first anoxic tank 31 and the first aerobic tank 32 are in a contact oxidation mode, the effluent of the first aerobic tank 32 partially flows back to the first anoxic tank 31 and partially enters the first MBR tank 33, the effluent of the first MBR tank 33 partially flows back to the first anoxic tank 31 and the first aerobic tank 32 and partially flows to an intermediate water tank 4, the effluent of the intermediate water tank 4 enters a second-stage multi-element electrocatalytic oxidation device 5 through a water pump and a flowmeter, the second-stage multi-element electrocatalytic oxidation device 5 is preferably a device shown in Chinese patent application No. 202223087968.1, particle electrodes in the device adopt diatomite and active carbon-based composite particle electrodes, and the filling amount is 60-70% of the effective volume of the device; the effluent of the two-stage multielement electrocatalytic oxidation equipment 5 flows into the two-stage biochemical system 6 from the first anoxic tank 61, the second aerobic tank 62 and the second MBR tank 63 in sequence, the effluent of the second aerobic tank 62 and the effluent of the second MBR tank 63 both partially flow back into the second anoxic tank 61, and the second anoxic tank 61 and the second aerobic tank 62 both adopt a contact oxidation mode; the effluent of the second MBR tank 63 automatically flows into the clean water tank 7, an online detection system arranged in the clean water tank 7 can detect the pH, COD concentration, BOD concentration, ammonia nitrogen, total phosphorus concentration and the like of the effluent, when the pH of the wastewater reaches 6-9, COD is less than or equal to 500mg/L, BOD and less than or equal to 50mg/L, ammonia nitrogen is less than or equal to 45mg/L, total nitrogen is less than or equal to 70mg/L, total phosphorus is less than or equal to 8mg/L, the wastewater is discharged to a municipal pipe network, and otherwise, the wastewater flows back to the middle water tank 4.

The treatment system pretreats wastewater to be treated by utilizing two-stage multielement electrocatalytic oxidation, and the multielement electrocatalytic oxidation is arranged in front, so that most pollutants can be removed, the toxicity of the wastewater is reduced, the pressure in a biochemical stage is reduced, the B/C is improved, the residence time of a biochemical system is shortened, and the occupation of land of the biochemical system is reduced. Moreover, the processing system has strong impact resistance and good stability, can be skid-mounted and transported, and is convenient and quick to install on site.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (3)

1. A waste water treatment system of a fibrous membrane production workshop is characterized in that: sequentially arranged: the device comprises an adjusting tank (1), a primary multi-element electrocatalytic oxidation device (2), a primary biochemical system (3), a middle water tank (4), a secondary multi-element electrocatalytic oxidation device (5), a secondary biochemical system (6) and a clean water tank (7); stirring devices are arranged in the regulating tank (1) and the middle water tank (4);

the primary biochemical system (3) comprises a first anoxic tank (31), a first aerobic tank (32) and a first MBR tank (33) which are sequentially arranged, a return pipe A (34) is arranged between the first aerobic tank (32) and the first anoxic tank (31), and a return pipe B (35) and a return pipe C (36) are respectively arranged between the first MBR tank (33) and the first aerobic tank (32) and between the first anoxic tank (31);

the secondary biochemical system (6) comprises a second anoxic tank (61), a second aerobic tank (62) and a second MBR tank (63), liquid microbial inoculum adding ports are formed in the first aerobic tank (32) and the second aerobic tank (62), a return pipe E (65) is arranged between the second aerobic tank (62) and the second anoxic tank (61), and a return pipe D (64) is arranged between the second MBR tank (63) and the second anoxic tank (61);

an online detection system is arranged on the clean water tank (7), and a return pipe F (71) is arranged between the clean water tank (7) and the middle water tank (4).

2. The fiber membrane production plant wastewater treatment system of claim 1, wherein: the particle electrode in the first-stage multielement electrocatalytic oxidation equipment (2) adopts an active carbon-based particle electrode, and the filling quantity is 80-90% of the effective volume of the device.

3. The fiber membrane production plant wastewater treatment system of claim 1, wherein: the particle electrode in the two-stage multielement electrocatalytic oxidation equipment (5) adopts diatomite and active carbon-based composite particle electrode, and the filling quantity is 60-70% of the effective volume of the device.