CN-122010343-A - Equipment and method capable of treating wastewater in sections and realizing zero emission and comprehensive utilization for papermaking enterprises

CN122010343ACN 122010343 ACN122010343 ACN 122010343ACN-122010343-A

Abstract

The invention relates to the technical field of comprehensive treatment in pulping and papermaking industries, and discloses equipment capable of treating wastewater in a segmented manner and comprehensively utilizing the wastewater, which comprises the following components: the sewage treatment device comprises a sewage treatment box, wherein a sewage treatment mechanism is arranged in the sewage treatment box and comprises two first rotating rods, four bead wheels, two conveying belts, a plurality of screen mesh grid integrated filter plates, a water inlet pipe, two first limiting plates, two second limiting plates and a material guide plate. According to the invention, different types of pollutants can be removed pertinently based on a three-stage treatment mode, so that the effluent index meets the recycling requirement, the purification effect is improved, the filter material is prevented from being blocked by real-time cleaning, the shutdown maintenance frequency is reduced, soluble salt or sedimentation floc can be generated by medicament reaction, no harmful byproducts are generated, the environment-friendly requirement is met, the recycled fiber impurities are reused, the wastewater is recycled in a closed mode, and the water resource cost is reduced.

Inventors

ZHOU XIANBO
LIU KUANYONG
YANG YONG
LI YUANWU

Assignees

贵州鹏昇(集团)纸业有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (10)

1. The equipment capable of treating wastewater in a sectionalized way and realizing zero emission and comprehensive utilization for a papermaking enterprise is characterized by comprising a wastewater treatment box, wherein a wastewater treatment mechanism is arranged in the wastewater treatment box, the wastewater treatment mechanism comprises two first rotating rods, four bead wheels, two conveying belts, a plurality of screen grid integrated filter plates, a water inlet pipe, two first limiting plates, two second limiting plates and a material guide plate, the first rotating rods are symmetrically arranged on the inner walls of the two sides of the wastewater treatment box in a left-right rotation way, the four bead wheels are correspondingly and fixedly sleeved on the first rotating rods in pairs, the two conveying belts are sleeved on the corresponding two bead wheels and are matched with the bead wheels, and the plurality of screen grid integrated filter plates are equidistantly arranged on the two conveying belts; the first limiting plates are symmetrically arranged in the sewage treatment box front and back, the first limiting plates are respectively positioned on one sides of the two conveying belts, the second limiting plates are arranged on the first limiting plates, the water inlet pipe is arranged at the top of the sewage treatment box, and the bottom end of the water inlet pipe extends into the sewage treatment box and is positioned between the first limiting plates; The sewage treatment device is characterized in that a discharge hole is formed in the outer wall of one side of the sewage treatment box, a material guide plate is arranged on the discharge hole, a collecting box is arranged on the outer wall of one side of the sewage treatment box, and the collecting box is matched with the discharge hole and the material guide plate.
2. The device for the sectional treatment of wastewater zero discharge and comprehensive utilization of a papermaking enterprise according to claim 1, wherein a filter assembly is arranged in the wastewater treatment box, the filter assembly comprises a first installation frame, the first installation frame is installed in the wastewater treatment box, a first partition plate is installed on the inner wall of the bottom of the first installation frame, a guide block is installed on the top of the first partition plate, the space in the first installation frame is divided into a left space and a right space by the first partition plate, the left space and the right space are both positioned below the screen grid integrated filter plate, and a first filter plate and a second filter plate are installed in the left space and the right space respectively.
3. The device for the sectional treatment of zero wastewater discharge and comprehensive utilization of a papermaking enterprise according to claim 1, wherein a cleaning assembly is arranged in the sewage treatment tank, the cleaning assembly comprises a second rotating rod, the second rotating rod is arranged in the sewage treatment tank, the second rotating rod is positioned between two adjacent screen grid integrated filter plates, the cleaning brush is fixedly sleeved on the second rotating rod, the cleaning brush is in contact with the screen grid integrated filter plates, a connecting pipe is arranged in the sewage treatment tank, a plurality of first spray nozzles are arranged on the outer wall of the connecting pipe in a communicating manner, and the connecting pipe is positioned between the second rotating rod.
4. The apparatus for the sectional treatment of wastewater zero discharge and comprehensive utilization of a paper-making enterprise according to claim 3, wherein the driving assembly is arranged in the wastewater treatment tank, the driving assembly comprises a water pump, the water pump is arranged on the outer wall of one side of the wastewater treatment tank, a water pumping pipe is arranged at a water pumping port of the water pump, a water discharging pipe is arranged at a water discharging port of the water pump, one end of the water discharging pipe extends into the wastewater treatment tank and is communicated with the connecting pipe, a motor is arranged on the outer wall of one side of the wastewater treatment tank, one end of the corresponding rotating rod I extends out of one side of the wastewater treatment tank and is fixedly connected with an output shaft of the motor, a main gear is fixedly sleeved on the rotating rod I, one end of the rotating rod II extends out of one side of the wastewater treatment tank and is fixedly sleeved with a driven gear, and the driven gear is meshed with the main gear.
5. The device capable of treating wastewater in a sectionalized manner and comprehensively utilizing the wastewater, as claimed in claim 2, wherein the wastewater treatment tank is internally provided with a communicating water guide component, the communicating water guide component comprises a partition plate II, the partition plate II is installed in the wastewater treatment tank, the space in the wastewater treatment tank is divided into an upper space and a lower space by the partition plate II, the partition plate II is positioned below the bottom of the installation frame I, the guide block II is installed at the top of the partition plate II, the wastewater treatment tank and the guide block II are jointly provided with the same guide block III, the outer wall of one side of the wastewater treatment tank is provided with a communicating pipe, two ends of the communicating pipe are respectively extended into the upper space and the lower space, two triangular inclined blocks are symmetrically installed on the guide block II, and one end of the communicating pipe extending to the upper space is positioned between the two triangular inclined blocks.
6. The device for treating wastewater in a sectionalized manner and realizing zero emission and comprehensive utilization of wastewater in a papermaking enterprise according to claim 3, wherein a partition plate III is installed in the lower space, the lower space is divided into a stirring space and an aeration space by the partition plate III, a stirring assembly is arranged in the stirring space and comprises two rotating rods III, the two rotating rods III are symmetrically arranged in the stirring space in an up-down rotation mode, a plurality of stirring rods are fixedly installed on the two rotating rods III, one ends of the two rotating rods III extend out of one side of the wastewater treatment tank and are fixedly sleeved with rotating gears III, one end of the corresponding rotating rod III is fixedly provided with a rotating gear I, one end of the rotating rod II is fixedly provided with a rotating gear II, and the rotating gear I and the rotating gear II are jointly sleeved with the same toothed belt.
7. The apparatus for the sectional treatment of wastewater zero discharge and comprehensive utilization of a paper-making enterprise according to claim 6, wherein the third partition plate is provided with a through hole, the aeration space is internally provided with an aeration component, the aeration component comprises an installation air pipe, the installation air pipe is installed in the aeration space, the outer wall of the installation air pipe is communicated with a plurality of spray heads II, the outer wall of one side of the wastewater treatment tank is provided with an air pump, the exhaust port of the air pump is communicated with an exhaust pipe, the exhaust pipe is provided with a one-way valve, and one end of the exhaust pipe extends into the wastewater treatment tank and is communicated with the installation air pipe.
8. The apparatus for the sectional treatment of wastewater zero discharge and comprehensive utilization of a paper-making enterprise according to claim 7, wherein a second installation frame is installed in the aeration space, a fourth guide block is installed at the top of the second installation frame, the outer wall of the fourth guide block is attached to the inner wall of the aeration space, a bamboo charcoal filter plate and an activated charcoal filter plate are installed in the second installation frame, a water outlet pipe is installed on the outer wall of one side of the sewage treatment tank, one end of the water outlet pipe extends into the aeration space, and a controller is installed on the outer wall of one side of the sewage treatment tank.
9. The apparatus for the sectional treatment of wastewater zero discharge and comprehensive utilization of paper-making enterprises according to claim 6, wherein the outer wall of one side of the wastewater treatment tank is provided with a dosing pipe, one end of the dosing pipe extends into the stirring space, the stirring space is filled with a pH regulator, a coagulant, a flocculant and a coagulant aid through the dosing pipe, and the sequential filling effects of the reagents are as follows: (1) The pH value of the sewage is regulated to the optimal reaction range of subsequent coagulation and flocculation, excessive acid and alkali in the sewage are neutralized, the damage of the acid and alkali to subsequent agents is reduced, the dissolution or precipitation of partial acidic and alkaline pollutants is promoted, the subsequent removal is assisted, and the reaction formula is as follows: h2SO4+2 NaOH- & gtNa 2SO4+2H2O to generate soluble salt, and no secondary pollution is caused; Ca (OH) 2+H2SO4- & gtCaSO4 ++2H2O, generating slightly soluble calcium sulfate which can be settled along with flocs to assist in removing suspended matters; H + generated by ionization of H 2 SO 4 preferentially reacts with OH - (H + +OH - →H 2 O), consumes excessive OH - in sewage, enables Ca (OH) 2 to be dissolved and balanced to move right, and continuously releases Ca 2+ ; When the product of Ca 2+ concentration and SO 2- concentration is not less than the solubility product of CaSO 4 (Ksp=9.1X10 -6 , 25 ℃), crystallization precipitation occurs: ca 2 + SO 4 2- →CaSO 4 (s); initially generated CaSO 4 is fine crystal nucleus (particle size is less than 1 μm), and the crystal nucleus is gradually grown into needle-shaped or flaky crystals (particle size is 5-10 μm) by controlling stirring intensity (80 r/min) and residence time (20-25 min), so that 'flocculation nucleus' is formed; Ca (OH) 2 (s, lime milk) +h 2 SO 4 (aq)→CaSO 4 (s, form II) +2h 2 O (I) (form II is stable calcium sulfate dihydrate, with optimal sedimentation properties); (2) Coagulant, removing fine suspended matters and colloid particles such as fiber fragments, filler CaCO3 and lignin colloid in sewage, reducing turbidity, adsorbing partial soluble organic matters such as chromaticity substances and micromolecular COD, reducing COD and chromaticity, providing' micro flocculation for subsequent flocculation, and strengthening the growth of the flocculation, wherein the reaction formula is as follows: Colloid) +3h2so4 (Al (OH) 3; Aluminum sulfate is completely ionized in an aqueous solution to generate Al 3+ and SO 4 2- ; Al 2 (SO 4 ) 3 (aq)→2Al 3+ (aq) + 3SO 4 2- (aq),SO 4 2- As inert ions, the method does not participate in subsequent reactions, only provides electrolyte environment, compresses colloid double electric layers (auxiliary destabilization) in sewage, and leads the core reaction to be dominated by Al 3+ ; Hydrolysis of Al 3+ is a stepwise reversible reaction, and is regulated by pH value and temperature to finally generate Al (OH) 3 colloid, and the reactions of the steps are as follows: First step (primary hydrolysis) Al 3+ + H 2 2+ (aq) + H + (Equilibrium constant K 1 =1.4×10 -5 at 25 ℃) to produce a mononuclear hydroxyl complex, positively charged; second step (intermediate hydrolysis) [ Al (OH) ] 2+ + H 2 2 ] + (aq) + H + （K 2 =1.0×10 -6 ) Further hydroxylation, a weakening of the positive charge; Third step (advanced hydrolysis) [ Al (OH) 2 ] + + H 2 3 (colloid) + H + （K 3 =8.0×10 -8 ) Forming amorphous Al (OH) 3 colloid, wherein the surface of the colloid is weakly and positively charged; synergistic polymerization, wherein a part of mononuclear hydroxyl complexes are polymerized through a hydroxyl bridge to form polynuclear complexes (such as [ Al 2 (OH) 2 ] 4+ 、[Al 3 (OH) 6 ] 3+ ]), and the polynuclear complexes are core precursors for forming micro-flocculation cores; Excessive HCO 3- in the sewage consumes H + （HCO 3 - + H + →CO 2 ↑+ H 2 O generated by hydrolysis, promotes the hydrolysis balance to move forward, and promotes the mass production of Al (OH) 3 colloid; The surface of the Al (OH) 3 colloid is positively charged, and the Al (OH) 3 colloid is electrostatically attracted with negatively charged pollutants in papermaking wastewater to neutralize the surface charge, so that the colloid stability is lost; The amorphous structure of Al (OH) 3 colloid has extremely large specific surface area, and the surface hydroxyl (-OH) can adsorb soluble chromaticity substances and micromolecular COD in sewage through hydrogen bond and Van der Waals force; The adsorbed pollutant particles are combined with Al (OH) 3 colloid to form a 'micro flocculation core' with the diameter of 1-5 mu m, so that an attachment point is provided for the bridging effect of a subsequent flocculating agent (PAM), and the rapid generation of large-volume flocs is ensured; Al (OH) 3 colloid is in a stable state at pH 6.5-7.5, and cannot be further hydrolyzed to generate AlO 2 - (at pH > 8) or redissolved (at pH < 5); The generated flocculation core has good sedimentation performance, can not run off along with effluent, has no toxicity to Al (OH) 3 colloid, and has no secondary pollution risk in the subsequent treatment of sludge; (3) The flocculant is used for polymerizing the micro alum flocs generated by coagulation into large-volume and high-density flocs, so that the sedimentation speed is greatly improved, the removal rate of suspended matters, COD (chemical oxygen demand) and chromaticity is further improved, the water content of sludge is reduced, and the subsequent solid-liquid separation difficulty is reduced; (4) Coagulant aid, which can regulate sewage viscosity and temperature, improve the environment for forming flocs, strengthen the flocs, improve the solid-liquid separation efficiency and make up for the defects of coagulation and flocculant.
10. The method for using the equipment capable of realizing the sectional treatment of the zero discharge of the wastewater and comprehensively utilizing the wastewater for the paper-making enterprises is characterized by comprising the equipment capable of realizing the sectional treatment of the zero discharge of the wastewater and comprehensively utilizing the wastewater for the paper-making enterprises as set forth in claim 1 and comprises the following steps: the first step, the wastewater is injected into a wastewater treatment box through a water inlet pipe, a first limiting plate and a second limiting plate guide the wastewater to precisely flow to a screen grid integrated filter plate, large-particle suspended matters (fiber residue and silt) are trapped, a motor drives a first rotating rod to rotate, a conveyer belt is driven by a bead wheel, and trapped impurities on the filter plate are conveyed to a collecting box through a material guiding plate for recycling; step two, the trapped wastewater falls to a first mounting frame, the first partition plate and the first guide block split the wastewater to left and right spaces, and the wastewater is filtered in a grading way through a first filter plate (medium-grain-diameter impurities) and a second filter plate (fine-grain-diameter impurities) to reduce the turbidity of the wastewater; step three, a main gear of the first rotating rod is meshed with a secondary gear of the second rotating rod to drive the cleaning brush to rotate, and meanwhile, a water pump pumps water and ejects out of the first spray head through the connecting pipe, so that synchronous cleaning of 'mechanical brushing and high-pressure flushing' is realized; And step four, three-stage deep purification, which comprises the following steps: (1) The communicating water guide assembly guides the wastewater to flow into the lower space through the communicating pipe by the partition plate II, the guide block II and the triangular inclined block; (2) The wastewater enters a stirring space, a pH regulator, a coagulant, a flocculant and a coagulant aid are sequentially added through a dosing pipe, stirring rods (with toothed belt linkage driving) of a rotating rod III are fully stirred, acid and alkali are neutralized, and a coagulating colloid is formed to form flocs, so that COD and chromaticity are reduced; (3) The wastewater enters an aeration space through a port and is filtered through a bamboo charcoal filter plate (deodorizing) and an active carbon filter plate (deep adsorption); (4) And finally, the air pump is provided with an air pipe and a spray head II for aeration, so that organic matter degradation is enhanced, qualified water is discharged from a water outlet pipe, the water can be returned to the papermaking section for recycling, and the solid impurities in the collecting box are recycled, thereby realizing zero emission and resource circulation.

Description

Equipment and method capable of treating wastewater in sections and realizing zero emission and comprehensive utilization for papermaking enterprises Technical Field The invention relates to the technical field of comprehensive treatment in pulping and papermaking industries, in particular to equipment and a method capable of treating wastewater in a segmented manner and comprehensively utilizing the wastewater. Background At present, the pulping and papermaking industry waste water has complex components and contains a large amount of suspended matters (fiber fragments and silt), colloid particles (lignin colloid and CaCO 3 filler), soluble organic matters (chromaticity substances and micromolecular COD) and acid-base pollutants, and the treatment difficulty is high. The invention discloses a pulp clean production process method for treating waste liquid in a sectional way and comprehensively utilizing the waste liquid in a sectional way, which is characterized in that waste liquid in the pulping process is treated in a sectional way, and the waste liquid in the production process, such as material washing waste water, black (red) liquor in digestion, middle section waste water and bleaching waste water in the production process are treated in a sectional way by adopting the filter membrane technology of pretreatment, net filtration, microfiltration (MF), ultrafiltration (UF) and Nanofiltration (NF), and organic compounds such as lignin and solid matters are selectively extracted and separated respectively by applying the sieving effect in the purifying process, and then are deeply processed into new products with economic value respectively, the purified waste water is changed into clean water, and the clean waste water is recycled in the process without discharge. The invention can replace the traditional alkali recovery and three-stage biochemical pollution control method, realize thoroughly eliminating pollution zero emission, saving energy and water, comprehensively utilizing and improving the economic benefit of enterprises. Is a necessary way for clean production in pulping and papermaking industries. Aiming at the related technology, the inventor considers that the defects of huge investment and complex flow of the traditional alkali recovery process, atmospheric pollution caused by the emission of harmful gases such as hydrogen sulfide, sulfur dioxide and the like, the three-stage biochemical pollution control method is passively low-efficiency, the thorough purification and zero emission of wastewater can not be realized, part of treatment equipment is lack of targeted sectional design, filter materials are easy to block, the purification efficiency is unstable, a 'treatment-recovery-reuse' closed loop is not formed, the waste of water resources is serious, and pollutants can not be effectively recovered. Disclosure of Invention In order to solve the technical problems of the background technology, the invention provides equipment and a method for treating wastewater in a sectionalized way and comprehensively utilizing the wastewater. The invention adopts the following technical scheme that the equipment capable of treating wastewater in a sectionalized way and comprehensively utilizing the wastewater for a papermaking enterprise comprises a wastewater treatment box, wherein a wastewater treatment mechanism is arranged in the wastewater treatment box, the wastewater treatment mechanism comprises two first rotating rods, four bead wheels, two conveying belts, a plurality of screen grid integrated filter plates, a water inlet pipe, two first limiting plates, two limiting plates and a material guide plate, the first rotating rods are arranged on the inner walls of the two sides of the wastewater treatment box in a bilateral symmetry way, four bead wheels are fixedly sleeved on the first rotating rods in a pairwise corresponding way, the two conveying belts are sleeved on the corresponding two bead wheels and are matched with the bead wheels, and the plurality of screen grid integrated filter plates are arranged on the two conveying belts in an equidistant way; the first limiting plates are symmetrically arranged in the sewage treatment box front and back, the first limiting plates are respectively positioned on one sides of the two conveying belts, the second limiting plates are arranged on the first limiting plates, the water inlet pipe is arranged at the top of the sewage treatment box, and the bottom end of the water inlet pipe extends into the sewage treatment box and is positioned between the first limiting plates; The sewage treatment device is characterized in that a discharge hole is formed in the outer wall of one side of the sewage treatment box, a material guide plate is arranged on the discharge hole, a collecting box is arranged on the outer wall of one side of the sewage treatment box, and the collecting box is matched with the discharge hole and the material guide plate. As a further