CN-121990743-A - Sludge multiphase catalysis super-oxidation wall-breaking deep dehydration treatment system and method

CN121990743ACN 121990743 ACN121990743 ACN 121990743ACN-121990743-A

Abstract

The invention discloses a sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system, which comprises an ozone generating device, a multiphase micro-nano bubble mixed inflow device, a uniform mixing reaction tank, a uniform mixing tempering system and a high-pressure dehydration system, wherein a dispersing device, a sludge distributing device, a primary catalytic oxidation reaction zone and a secondary catalytic oxidation reaction zone are arranged in the uniform mixing reaction tank, the multiphase micro-nano bubble mixed inflow device comprises a slurry inlet pipe, a high-pressure feed pump and a jet device, the mixing tempering system comprises a mixing device and a dosing device, and the high-pressure dehydration system comprises a high-pressure plate frame dehydration device, a squeezing water tank and a sewage treatment device. The high-flow sludge and ozone form an ozone mixed phase flow in the ejector to be injected into the uniform mixing reaction tank, the ozone and the sludge are mixed to generate super catalytic oxidation reaction, the cell walls of the sludge and EPS are deeply destroyed and decomposed, the slurry after wall breaking is subjected to conditioning and thickening by the uniform mixing conditioning system, and then mud-water separation is carried out by a high-pressure plate frame dehydration device to obtain high-concentration organic wastewater and low-cement-content cakes.

Inventors

ZHONG FENG
LI JIANGSHAN
XU HAILIN
LI LULU
HAN LIJUN
WANG LINFENG

Assignees

中国科学院武汉岩土力学研究所
三川德青科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260204

Claims (10)

1. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system is characterized by comprising an ozone generating device, a multiphase micro-nano bubble mixed inflow device, a uniform mixing reaction tank, a uniform mixing tempering system and a high-pressure dehydration system; The device comprises a uniform mixing reaction tank, a dispersing device, a sludge distributing device, a first-stage catalytic oxidation reaction zone and a second-stage catalytic oxidation reaction zone, wherein the dispersing device, the sludge distributing device, the first-stage catalytic oxidation reaction zone and the second-stage catalytic oxidation reaction zone are sequentially arranged in the uniform mixing reaction tank from bottom to top; The multiphase micro-nano bubble mixing inflow device comprises a slurry inlet pipe, a high-pressure feed pump and a jet device, wherein the feed end of the slurry inlet pipe is communicated with the turbulent flow mixing region, the slurry outlet end of the slurry inlet pipe is communicated with the feed inlet of the high-pressure feed pump, the jet device comprises an ozone air inlet, a conical feed joint and a pressurized mixed flow pipe, the feed end of the conical feed joint is communicated with the discharge outlet of the high-pressure feed pump, the discharge ends of the conical feed joint extend into the feed end of the pressurized mixed flow pipe and are mutually communicated, the side wall of the feed end of the pressurized mixed flow pipe is provided with the ozone air inlet, the discharge end of the pressurized mixed flow pipe is communicated with the dispersing device, the ozone air inlet is communicated with the ozone generating device, and high-flow sludge and ozone from the uniform mixing reaction tank form an ozone mixed flow in the jet device and are injected into the mixed reaction tank through the dispersing device in a high-pressure jet manner; The uniform mixing tempering system comprises a mixing device and a medicine adding device, wherein the mixing device comprises a mixing bin, an overflow bin, a different-direction bipolar sedimentation inclined plate device, a double-spiral mixed flow device and a mud discharging device, the overflow bin is arranged at the top of the mixing bin, the bipolar sedimentation inclined plate device is arranged at the middle upper part of the mixing bin, the double-spiral mixed flow device is arranged at a feed inlet of the mixing bin and is communicated with a mud discharging pipeline of a uniform mixing reaction tank, and the mud discharging device is arranged at the bottom of the mixing bin; The high-pressure dewatering system comprises a high-pressure plate frame dewatering device, a squeezing water tank and a sewage treatment device, wherein a feeding pipeline of the high-pressure plate frame dewatering device is communicated with a mud discharging device of the mixing device, the squeezing water tank is communicated with the high-pressure plate frame dewatering device to press pressure water into a diaphragm plate squeezing cavity, a drain pipe of the high-pressure plate frame dewatering device is connected with the sewage treatment device, and the overflow bin is connected to the sewage treatment device through an overflow pipe.
2. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1 is characterized in that a discharging end of the conical feeding connector is of a tapered cone structure to form a pressurizing area, a gap is reserved between an outer wall of the discharging end of the conical feeding connector and an inner wall of a feeding end of the pressurized mixed flow pipe to serve as an ozone air inlet channel and form a negative pressure area, the pressurized mixed flow pipe comprises a tapered section and a diffusion section along a fluid flow direction, the tapered section forms a high-pressure jet flow area, and the diffusion section forms a mixed flow diffusion area.
3. The sludge multiphase catalytic super-oxidation wall-breaking deep dehydration treatment system according to claim 1, wherein the primary catalytic oxidation reaction zone and the secondary catalytic oxidation reaction zone are filled with Mn-Fe-C micro-electrolysis composite catalytic material.
4. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1, wherein the turbulent mixing zone is provided with a back flushing device, and the back flushing device is communicated with external high-pressure clean water or high-pressure air equipment and is used for removing impurities attached to the surfaces of catalytic materials in the primary catalytic oxidation reaction zone and the secondary catalytic oxidation reaction zone.
5. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1 is characterized in that the dispersion device comprises a main pipe, a branch pipe and a dispersion spray head, wherein the main pipe and the branch pipe are horizontally arranged, the main pipe is communicated with a discharge end of a pressurized mixed flow pipe, the branch pipe is vertically or parallel to the main pipe and is communicated with the main pipe, the branch pipe is vertically arranged above the branch pipe and is communicated with the branch pipe, the dispersion spray head is fixedly arranged above the branch pipe, the dispersion spray head comprises a limit nut, a fixing nut and a conical dispersion disc which are sequentially arranged from bottom to top, the lower end of the limit nut is fixedly connected with the branch pipe, the upper end of the limit nut is fixedly connected with the lower end of the fixing nut, a compression elastic piece and a plugging ball are arranged in an inner cavity of the fixing nut, a limit step is designed at the lower end of the inner cavity of the limit nut, the plugging ball is pre-pressed downwards at the limit step by the compression elastic piece to form a seal, the upper sludge slurry is prevented from flowing back, and a gap is reserved between the conical dispersion disc and an outlet of the fixing nut.
6. The sludge multiphase catalytic super-oxidation wall-breaking deep dehydration treatment system according to claim 1, wherein the upper part and the lower part of the primary catalytic oxidation reaction zone and the secondary catalytic oxidation reaction zone are respectively provided with a tower internal supporting structure, and the tower internal supporting structure comprises a fine grid, a coarse grid, a turbulent plate layer and a fixed supporting layer which are sequentially arranged from the near to the far.
7. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1, wherein the double-helix mixed flow device comprises a cylinder body and a screw shaft rotatably arranged in the center of the cylinder body, wherein an upper section and a lower section of the screw shaft are designed to be right-helix sections and a middle section of the screw shaft are designed to be left-helix sections, or the upper section and the lower section are designed to be left-helix sections and the middle section is designed to be right-helix sections, so that a double-helix structure is formed.
8. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1, wherein the mixing device further comprises a conical dispersing structure fixedly installed at the bottom end of the double-spiral mixed flow device, and the diameter of the conical dispersing structure is gradually increased from top to bottom.
9. The sludge multiphase catalysis super oxidation wall breaking deep dehydration treatment system according to claim 1, wherein the anisotropic bipolar sedimentation inclined plate device comprises two layers of sedimentation inclined plates which are arranged at intervals on the lower part and the upper part, the inclination directions of the two layers of sedimentation inclined plates are opposite to each other, and the two layers of sedimentation inclined plates are positioned above the outlet of the double-spiral mixed flow device.
10. A method for heterogeneous catalytic super-oxidative wall-breaking deep dehydration treatment of sludge, which is characterized by adopting the system as claimed in any one of claims 1-9, and comprising the following steps: Generating 200-250mg/L high-concentration oxygen through an ozone generating device, introducing multiphase micro-nano bubble mixed inflow device through an ozone air inlet, extracting high-flow sludge from a turbulent flow mixing area of a uniform mixing reaction tank through a high-pressure feed pump, and pumping the high-flow sludge into the multiphase micro-nano bubble mixed inflow device; ozone in the homomixer reactor is further mixed with sludge in the reactor to contact with the sludge in the reactor, and the ozone sequentially passes through a primary catalytic oxidation reaction zone and a secondary catalytic oxidation reaction zone to be fully contacted with the multiphase coupling catalytic material, so that a strong oxidation environment is constructed, a super catalytic oxidation reaction is generated, and the cell walls of the sludge and EPS are deeply destroyed and decomposed, so that intracellular water and adsorbed water are released; And conveying the mixed sludge slurry subjected to wall breaking to a uniform mixing tempering system for tempering and thickening, and conveying to a high-pressure plate frame dehydration device for mud-water separation to finally obtain high-concentration organic wastewater and low-cement-content cakes, thereby realizing deep dehydration and reduction treatment of the sludge.

Description

Sludge multiphase catalysis super-oxidation wall-breaking deep dehydration treatment system and method Technical Field The invention relates to the technical field of activated sludge treatment, in particular to a sludge multiphase catalysis super-oxidation wall-breaking deep dehydration treatment system and method. Background The current activated sludge treatment field of sewage plants is poor in dehydration performance, which is one of key bottlenecks for restricting efficient sludge treatment. In the prior art, the sludge dewatering effect is generally improved by adopting plate and frame filter pressing, centrifugation and other mechanical dewatering modes. However, since a large number of microbial cells and Extracellular Polymeric Substances (EPS) in sludge have a compact structure and wrap a large amount of water, conventional mechanical conditioning is difficult to effectively destroy the cell structure, and the water is difficult to release. In order to solve the problem, fenton and ozone oxidation technology is introduced in recent years to carry out wall breaking pretreatment on sludge, and the principle is that the strong oxidizing property of ozone is utilized to destroy cell walls and EPS structures, so that intracellular water and adsorbed water are released, and the dehydration performance is improved. At present, sludge conditioning equipment based on ozone treatment is partially developed in the market, and an ozone generator is usually adopted to be matched with a reaction tank, so that ozone is introduced into sludge for oxidation reaction in an aeration mode. The equipment has simple process, but the problems of low ozone mass transfer efficiency, long reaction time, high energy consumption, insufficient ozone utilization rate and the like generally exist. The method is characterized in that ozone is unevenly supplied to the reactor, so that ozone is locally gathered or forms short flow, the ozone cannot be fully contacted with sludge, partial areas are excessively oxidized, other areas are insufficiently reacted, the stability of the overall treatment effect is seriously affected, the concentration of dissolved ozone is low, the efficiency is low, a large amount of ozone escapes without participating in the reaction, an air source is wasted, tail gas treatment burden and potential safety hazards can be caused, the catalyst reaction is easy to passivate and lose efficacy, the oxidizing capacity of the ozone is difficult to fully play, an effective mixing and stirring mechanism is lacking in the reactor, sludge is easy to subside or form aggregation, the ozone is difficult to penetrate through sludge flocs, the overall wall breaking efficiency is low, and the dehydration improvement effect is not ideal. In addition, the traditional device does not optimize the reactor structure aiming at the sludge characteristics, so that ozone is unevenly distributed, partial oxidation is insufficient, the whole wall breaking effect is limited, and high-efficiency and energy-saving dehydration improvement is difficult to realize. The defects seriously limit the popularization and application of the ozone technology in deep dehydration of sludge. Therefore, development of a novel ozone oxidation sludge treatment system capable of efficiently transferring mass, strengthening ozone wall breaking effect and improving dehydration performance is needed. The invention aims at the key technical problems of poor difficult dehydration performance of the existing sludge wall breaking, low mass transfer efficiency of an ozone treatment technology and device, uneven ozone gas supply, low dissolution concentration, slow catalytic reaction, uneven sludge reaction and the like, and the invention is provided by innovatively designing the structure and the technological parameters of a reactor and matching with heterogeneous catalytic materials, thereby obviously improving the damage effect of ozone on the cell wall and EPS of the sludge and realizing the obvious improvement of the dehydration performance of the sludge. Disclosure of Invention Aiming at the problems of difficult dehydration of the wall breaking of the sludge, low ozone mass transfer efficiency, uneven ozone gas supply, low dissolution concentration, slow catalytic reaction, uneven sludge reaction and the like in the prior art, the invention provides a sludge multiphase catalysis super-oxidation wall breaking deep dehydration treatment system, which is characterized in that the damage effect of ozone on the cell wall of the sludge and EPS is obviously improved by optimally designing an efficient reactor structure and matching with multiphase catalytic materials, the obvious improvement of the sludge dehydration performance is realized, and the sludge deep dehydration reduction treatment is realized by matching with integrated tempering dehydration technical equipment. The technical scheme adopted by the invention is as follows: A sludge multiphase catal