CN-122010323-A - Functional adsorption joint O3Fluidization device for catalytic purification of wastewater and application thereof

CN122010323ACN 122010323 ACN122010323 ACN 122010323ACN-122010323-A

Abstract

A fluidization device for catalyzing and purifying wastewater by combining functional adsorption with O 3 and application thereof comprise a reactor main body, wherein the reactor main body is formed by encircling an outer barrel, a bottom plate and a top cover, a guide barrel is arranged in the outer barrel, an ascending area is formed in the guide barrel, a descending area is formed between the outer side of the guide barrel and the outer barrel, a water inlet pipe, an ozone inlet pipe, a gas collecting cover, a muddy catalyst fixed bed and a bionic adsorbent fixed bed are sequentially arranged in the descending area from top to bottom, water flow of the water inlet pipe is in countercurrent contact with ozone from top to bottom, ozone is forced to be dissolved downwards and react with wastewater, mixed fluid sequentially passes through a catalytic fixed bed layer and a bionic adsorbent fixed bed layer, and is circulated along the ascending area after passing through a bottom clearance area, clean water separated in the separation area is discharged through overflow holes, so that the functions of catalytic oxidation, bionic adsorption, valence conversion and gas stripping separation of various pollutants in the wastewater can be realized, and efficient synergistic removal can be realized, and the device belongs to the fields of complex industrial wastewater treatment and water recycling.

Inventors

WEI GENGRUI
WANG JIACHENG
PENG YAHUAN
WEI CHAOHAI
ZHU ZHONGWEN
ZHAO WEI
LIN PEIFANG
PANG ZIJUN
YANG JIAHAO
SONG ZHICHENG

Assignees

华南理工大学
宝武水务科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (10)

1. The fluidization device for catalyzing and purifying the wastewater by combining functional adsorption with O 3 is characterized by comprising a reactor main body, wherein the reactor main body is formed by encircling an outer cylinder, a bottom plate and a top cover; A guide cylinder is arranged in the outer cylinder, an ascending area is formed in the guide cylinder, and a descending area is formed between the outer side of the guide cylinder and the outer cylinder; the descending area is sequentially provided with a water inlet pipe, an ozone inlet pipe, a gas collecting cover, a fixed bed of the argillaceous catalyst and a fixed bed of the bionic adsorbent from top to bottom; The water inlet pipe is used for introducing wastewater, the ozone inlet pipe is used for inputting ozone, the gas collecting cover is used for collecting gas gathered in the descending region, the catalytic fixed bed is filled with a metal-loaded biochar catalyst, and the bionic adsorbent fixed bed is filled with a surface polymer modified biochar bionic adsorbent; A bottom gap area is formed between the lower end of the guide cylinder and the bottom plate, a separation area is formed between the upper end of the guide cylinder and the top cover, the separation area comprises a water outlet separation area below the liquid level and a gas collection area above the liquid level, the top cover is provided with a vent hole, the gas in the gas collection area is discharged through the vent hole, an overflow hole is formed in the upper part of the reactor main body, and clear water separated in the separation area is discharged through the overflow hole; the bottom gap area is provided with a gas distribution pipe which is opposite to the rising area and is communicated with an external gas supply device.
2. A fluidization device for catalytic purification of wastewater by combined functional adsorption and O 3 as set forth in claim 1 wherein the interior of the reactor body is filled with powdered activated carbon circulating with the fluid between the downfall zone, the bottom gap zone, the uprise zone and the separation zone.
3. The fluidization device for catalytic purification of wastewater by combined functional adsorption and O 3 according to claim 2, further comprising an activated carbon control assembly including a return line, a discharge line and a make-up line; The water outlet separation area comprises a powder activated carbon sedimentation area, a top cover is in a cover cylinder shape and is enclosed on the periphery and the upper side of the top of the outer cylinder, the powder activated carbon sedimentation area is formed between the outer side of the outer cylinder and the top cover, one end of a return pipeline is connected with the powder activated carbon sedimentation area, the other end of the return pipeline is connected with a descending area, the return pipeline is connected with a discharge pipeline and a supplementing pipeline through a three-way valve, and the supplementing pipeline is connected with an external activated carbon material opening tank through a fluid pump.
4. The fluidization device for catalytic purification of wastewater by combining functional adsorption and O 3 as set forth in claim 1, further comprising a bent pipe, wherein the cross section of the gas collection cover is inverted V-shaped, and the bent pipe is communicated with the inner top end of the gas collection cover and the rising area; A space for fluid to pass through is reserved between the edges of the two sides of the gas collecting cover and the outer cylinder and the inner cylinder, and a baffle plate is arranged on the inner wall of the outer cylinder and the outer wall of the guide cylinder and is positioned below the space.
5. The fluidization device for catalytic purification of wastewater by combining functional adsorption and O 3 as set forth in claim 1, wherein an effluent weir groove is provided on the outer side of the reactor body, the separation zone is connected with the effluent weir groove through an overflow hole, and a drain pipe is connected to the bottom end of the effluent weir groove.
6. The fluidization device for catalytic purification of wastewater by combining functional adsorption and O 3 as set forth in claim 1, wherein the bottom gap area is further provided with a cross baffle for rectification, and the cross baffle is located above the gas distribution pipe.
7. The fluidization device for catalytic purification of wastewater by combining functional adsorption and O 3 as set forth in claim 1, wherein the bottom gap area is connected with a drain pipe communicated with the outside, the drain pipe is provided with a control valve, and the drain pipe is used for draining wastewater in a stopping stage.
8. The fluidization device for catalyzing and purifying wastewater by combining functional adsorption and O 3 as set forth in claim 1, wherein the biochar catalyst and the surface polymer modified biochar bionic adsorbent are both honeycomb-structured fillers and are fixed by a support frame and a screen; The biochar catalyst is bimetal loaded biochar, and the bimetal is the combination of Fe and other transition metals; the surface polymer modified biochar bionic adsorbent is modified active carbon with polyhydroxybutyrate attached to the surface.
9. The fluidization device for catalytic purification of wastewater by combining functional adsorption and O 3 as set forth in claim 1, wherein the outer cylinder is provided with a manhole for supplementing and taking out carbonaceous materials in the fixed bed.
10. The application of the fluidization device for catalyzing and purifying wastewater by combining functional adsorption with O 3 according to any one of claims 1-9 is characterized in that the ozone consumption, the gas-liquid ratio, the reaction time and the temperature are adjusted according to the different water qualities of the wastewater to be treated; When the coking wastewater is biologically treated, the reaction time is 0.5-1 hour; When the nanofiltration concentrated water is treated, the reaction time is 3-5 hours; When the reverse osmosis concentrated water is treated, the reaction time is 8-10 hours; the fluidization device is combined with a membrane separation system, and water purified by the fluidization device enters a membrane separation unit for operation after being filtered by a water outlet micropore.

Description

Fluidization device for catalyzing and purifying wastewater by combining functional adsorption and O 3 and application thereof Technical Field The invention relates to the field of complex industrial wastewater treatment and water recycling, in particular to a fluidization device for purifying wastewater by combining functional adsorption and O3 catalysis and application thereof. Background Coking wastewater treatment and recycling generally adopt a combination process of a materialization unit, a biochemical unit, advanced treatment, membrane separation water recycling and the like. The physical and chemical processes (such as phenol distillation deamination, extraction separation, coagulating sedimentation and the like) mainly remove suspended matters and partial organic pollutants, provide treatability for subsequent biochemical reactions, the biochemical processes (such as AO, AAO, OHO or SBR) decompose degradable organic matters through microbial metabolism to remove nutritional pollutants, the advanced treatment (such as advanced oxidation, activated carbon adsorption and the like) further remove residual COD, chromaticity, hardness, persistent organic matters (such as polycyclic aromatic hydrocarbon) and the like, create water inlet conditions for water recycling technology, and the water recycling comprises membrane separation (softening, decolorizing, microfiltration, ultrafiltration, nanofiltration, reverse osmosis) and salt purification (evaporation, crystallization, recrystallization). However, the existing coking wastewater advanced treatment process has the following general problems: (1) The flow is long and the unit is repeated. The conventional process often comprises a plurality of stages of processes such as coagulating sedimentation, lime softening, ozone oxidation, active carbon adsorption and the like, and a secondary biochemical unit and a re-materialization unit are matched, so that the operation cost is up to more than 10 yuan/m 3. (2) The ozone utilization rate is low (usually lower than 50%), the active carbon is not fully utilized, and the functions cannot be exerted. The main reason is that the gas-liquid contact efficiency in the reactor is low, the mass transfer is limited, the reaction dynamics is not effectively exerted, and the difference between hydrophilic organic matters and hydrophobic organic matters cannot be identified. (3) The traditional reactor has single gas-liquid or gas-liquid-solid fixing mode, mostly flows in the same direction, gas distribution is uneven, bubble residence time is short, oxidant can escape due to insufficient reaction, high energy consumption and high cost are caused, and short flow phenomenon generally occurs. The existing research hotspots are mainly focused on the optimization of the reactor for strengthening the mass transfer efficiency. The fluidized bed device with porous plates or silica sand filling materials is used for realizing gas-liquid flow rate balance and circulation distribution and improving gas distribution uniformity, and the micro-bubble reaction system is used for obviously improving specific surface area, vapor pressure and gas-liquid contact time by generating bubbles with average diameter smaller than 45 mu m, and has a volume mass transfer coefficient far higher than that of conventional bubbles, but the structure of the micro-bubble reaction system generally still cannot fully utilize hydrodynamic behavior characteristics, so that the enhancement of reaction dynamics is difficult to realize, and ozone molecules and oxygen molecules are fully utilized. In addition, the tail water of the biological treatment of the coking wastewater still contains a large amount of refractory organic matters such as polycyclic aromatic hydrocarbons such as naphthalene, anthracene, phenanthrene, pyrene and the like, heterocyclic compounds such as pyridine, quinoline, indole, carbazole and the like, and microbial metabolites (soluble inert organic matters), wherein the BOD 5/CODCr ratio is lower than 0.1, and the biodegradability is extremely poor. The water is often accompanied with cyanide/thiocyanate complexes, fluorides, silicate, fe 3+、Ca2+ and other inorganic ions, chromaticity substances and the like. In high salt environments (e.g., nanofiltration/reverse osmosis concentrate), interactions between these contaminants are enhanced, making it difficult for biological processes to function again, and thus there is a strong need for a novel deep purification system with both adsorption, catalysis and mass transfer enhancement. Disclosure of Invention Aiming at the technical problems in the prior art, the invention aims to provide a fluidization device for purifying wastewater by combining functional adsorption with O 3 catalysis, which can realize the functions of catalytic oxidation, bionic adsorption, valence conversion and gas stripping separation of various pollutants in wastewater, can be used for nano-filtration/reverse osmosis