CN113772885A

CN113772885A - Closed operation zero-discharge process for papermaking wastewater

Info

Publication number: CN113772885A
Application number: CN202111043428.0A
Authority: CN
Inventors: 王梅
Original assignee: Hefei Hongtu Printing Co ltd
Current assignee: Hefei Hongtu Printing Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2021-12-10
Anticipated expiration: 2041-09-07
Also published as: CN113772885B

Abstract

The invention relates to the technical field of sewage treatment, in particular to a closed operation zero-discharge process for papermaking wastewater, which comprises pretreatment, equalization treatment, aerobic biochemical treatment, precipitation treatment and the like, wherein the pretreatment is smoothly carried out on the basis of a particle filtering device. In the invention, more and larger impurities are filtered out in the pretreatment stage of the wastewater, so that the blockage of inlets and outlets of other treatment equipment in the subsequent treatment process is avoided, and the integral treatment quality of the papermaking wastewater is also improved.

Description

Closed operation zero-discharge process for papermaking wastewater

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a closed operation zero-discharge process for papermaking wastewater.

Background

The paper making industry is always the main industrial pollution source in China, the pollution caused by the waste water accounts for one third of the pollution of all industrial waste water, the main sources of the discharge of the paper making waste water are the working procedures of washing, screening, concentrating, paper machine white water and the like, and the waste water is characterized in that: 1. the waste water amount is large, generally, the waste water amount is 30-80 tons per 1 ton of waste paper pulp, and if pulping, purifying and paper machine wet end generated waste water are added, the waste water amount is larger; 2. the wastewater mainly contains hemicellulose, lignin, inorganic acid salts, fine fibers, inorganic fillers, printing ink, dye and other pollutants, and indexes of the pollutants such as SS, COD, BOD and the like in the wastewater greatly exceed the national wastewater discharge standard of the paper industry, so that the attention of people on how to treat the wastewater from paper making by waste paper is increasing.

The existing treatment mode of the waste water generated in the paper-making process is generally hydrolysis acidification treatment, wherein the non-soluble organic matter is converted into the soluble organic matter, the organic matter which is difficult to biodegrade is converted into the organic matter which is easy to biodegrade, then the organic matter is removed by oxidation reaction, solid-liquid separation is carried out after precipitation, thereby the waste water can be treated, but when the waste water generated in the paper-making process is pretreated by the existing waste water treatment mode, the particulate matter impurities contained in the waste water are many and large in quality, the blockage phenomenon is easy to occur at the inlets of various treatment equipment after long-time use, the treatment quality of the waste water in the later period is influenced, and the adverse influence can be caused to the surrounding environment when the waste water is discharged.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a closed-operation zero-discharge process for papermaking wastewater.

The purpose of the invention can be realized by the following technical scheme:

a closed operation zero-discharge process for papermaking wastewater comprises the following steps:

s1, pretreating the papermaking wastewater to be treated through a filtering component to remove larger impurities in the wastewater;

s2, introducing the pretreated wastewater into a collection tank for temporary storage, and leading the wastewater out under the action of a pump, wherein the pump and an output pipeline are arranged at the lower end of the collection tank, so that the influence of the change of water quantity and water quality on the wastewater treatment process can be reduced, the water quality is equalized, and the subsequent treatment unit can obtain balanced water quantity and stable water quality during the operation period;

s3, adding an oxidant into the wastewater extracted from the collecting tank, stirring and oxidizing for 3-6 h;

s4, conveying the papermaking wastewater in the S3 into a settling tower, and conveying the wastewater flowing out of the settling tower into an ultra-shallow air flotation machine;

s5, feeding the wastewater flowing out of the ultra-shallow air flotation machine into an anaerobic tower, and adsorbing organic matters in the wastewater by microorganisms in the anaerobic tower to further improve the biodegradability of the wastewater;

s6, sending the wastewater flowing out of the anaerobic tower into a biochemical tank for aerobic biochemical treatment, and effectively removing residual organic matters and nitrogen and phosphorus substances in the wastewater;

and S7, filtering the clear water flowing out of the biochemical tank by using a fine filter screen to obtain clean water, and sending the finally treated water back to a production workshop for recycling.

Further, the pretreatment process of the papermaking wastewater in S1 is based on a particle filtering device, the device includes a rectangular mounting frame arranged at the outlet of the wastewater pipeline, three filtering bins are slidably arranged inside the mounting frame, a U-shaped channel is formed between the three filtering bins, two filtering bins slide out from the left side of the mounting frame, the other filtering bin slides out from the right side of the mounting frame, a fixing plate is arranged inside the mounting frame corresponding to the stagnation position of the filtering bins, a first sliding groove is formed in the top surface and the bottom surface of the mounting frame corresponding to the sliding track of the filtering bins, a rotatable flow guiding fan is arranged between the fixing plate and the inner cavity wall of the mounting frame, a bearing is arranged at the joint of the flow guiding fan and the first sliding groove, filtering nets are arranged on both sides of the filtering bins, sliding rails are arranged at the positions of the top surface and the bottom surface of the filtering bins corresponding to the first sliding groove, two spouts two have all been seted up to two inner chamber walls that filter the storehouse is relative, filter storehouse open-ended terminal surface and still seted up the spacing groove, just filter the inner chamber of storehouse and filled with porous adsorption material, the opening part of filtering the storehouse is provided with the slidable fly leaf, the fly leaf through two pull rods of its inner wall with the push pedal of filtering the storehouse inner chamber links to each other, the push pedal through the stopper of its lateral wall with two sliding connection of spout, the inner wall of fly leaf corresponds the position in spacing groove is provided with spacing, spacing with spacing groove activity joint.

Further, when the anaerobic treatment is performed in S5, a sludge layer is also disposed in the anaerobic tower, the sludge layer is anaerobic granular activated sludge, and includes hydrolysis acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria, and the use ratio of the hydrolysis acidification bacteria, the hydrogen-producing acetogenic bacteria and the methanogenic bacteria is 1:2: 3.

Further, in the step S6, the aerobic biochemical treatment is performed by a biofilm method, and the carrier used in the aerobic biochemical treatment is any one of PVC, PE, PP, resin, plastic, fiber and gelatin.

Further characterized in that the porous adsorbent material comprises diatoms, activated carbon, and activated aluminum.

Further, a filtering filler layer is arranged inside the settling tower in the step S4, and the filtering filler layer is a spherical filtering filler layer.

The invention has the beneficial effects that:

1. in the pretreatment stage of the wastewater, more and larger impurities are filtered, so that the blockage of inlets and outlets of other treatment equipment in the subsequent treatment process is avoided, and the integral treatment quality of the papermaking wastewater is improved;

2. with the comprehensive waste water treatment process of multistep, having compensatied the not enough of single waste water treatment for material clearance such as SS, COD, BOD, AOX, lignin and colourity in the waste water is higher, and in the processing procedure, required equipment is simple, improves the reuse rate of waste water, reduces the pollution degree that waste water impurity discharged.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic view of the construction of the mount of the present invention;

FIG. 4 is a schematic structural view of a guide fan according to the present invention;

FIG. 5 is a schematic structural view of a filter house and a movable plate according to the present invention;

fig. 6 is a schematic structural view of the movable plate of the present invention.

In the figure: 1. a mounting frame; 11. a first sliding chute; 2. a fixing plate; 3. a flow guiding fan; 31. a bearing; 4. a filtering bin; 41. a filter screen; 42. a slide rail; 43. a second chute; 44. a limiting groove; 5. a movable plate; 51. a handle; 52. a pull rod; 53. pushing the plate; 54. a limiting block; 55. and (5) a limiting strip.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Compared with the traditional wastewater treatment technology, the closed operation zero-discharge process for the papermaking wastewater has the advantages of low manufacturing cost, quick response, simple personnel operation, and capability of effectively forming flocs with compact surface area, so that the flocs settle at a high speed, and the wastewater treatment time is prolonged, thereby improving the production efficiency of the whole papermaking and reducing the whole manufacturing cost of the wastewater treatment, wherein the COD removal rate is improved by 30%, the BOD removal rate is improved by 25%, the chroma removal rate is improved by 28%, the SS removal rate is improved by 32%, the sludge volume ratio is higher than that of the traditional settling method by 3%, and the process is suitable for wide popularization and use.

s1, pretreating the papermaking wastewater to be treated through a filtering assembly to remove larger impurities in the wastewater, so that the blockage of inlets and outlets of other treatment equipment in the subsequent treatment process is avoided, and the integral treatment quality of the papermaking wastewater is improved;

s4, conveying the papermaking wastewater in the S3 into a settling tower, arranging a filtering filler layer inside the settling tower, wherein the filtering filler layer is a spherical filtering filler layer, and conveying the wastewater flowing out of the settling tower into an ultra-shallow air flotation machine;

s5, feeding the wastewater flowing out of the ultra-shallow air flotation machine into an anaerobic tower, adsorbing organic matters in the wastewater by microorganisms in the anaerobic tower, further improving the biodegradability of the sewage, performing anaerobic digestion on the organic matters in the wastewater under the action of microorganisms in an anaerobic granular sludge bed, and reducing the concentration of the organic matters in the sewage, wherein a sludge layer is arranged in the anaerobic tower, is anaerobic granular activated sludge and comprises hydrolytic acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria, and the use ratio of the hydrolytic acidification bacteria, the hydrogen-producing acetogenic bacteria and the methanogenic bacteria is 1:2: 3;

s6, sending the wastewater flowing out of the anaerobic tower into a biochemical tank for aerobic biochemical treatment, and effectively removing residual organic matters and nitrogen and phosphorus substances in the wastewater, wherein the aerobic biochemical treatment adopts a biofilm method, and the used carrier organic carrier is any one of PVC, PE, PP, resin, plastics, fibers and gelatin;

S1, the pretreatment process of paper making wastewater is based on a particle filtering device, as shown in figures 1 and 2, the device comprises a rectangular mounting frame 1 arranged at the outlet of a wastewater pipeline, three filtering bins 4 are arranged inside the mounting frame 1 in a sliding manner, a U-shaped channel is formed between the three filtering bins 4, two filtering bins 4 slide out from the left side of the mounting frame 1, the other filtering bin 4 slides out from the right side of the mounting frame 1, as shown in figure 3, a fixed plate 2 is arranged inside the mounting frame 1 corresponding to the stagnation position of the filtering bins 4, sliding grooves 11 are arranged on the top surface and the bottom surface of the mounting frame 1 corresponding to the sliding tracks of the filtering bins 4, as shown in figures 3 and 4, a rotatable flow guide fan 3 is arranged between the fixed plate 2 and the inner cavity wall of the mounting frame 1, a bearing 31 is arranged at the joint of the flow guide fan 3 and the two, as shown in figure 5, filter screens 41 are arranged on two sides of the filtering bins 4, the top surface and the bottom surface of the filtering bin 4 are provided with slide rails 42 at positions corresponding to the first sliding grooves 11, the two inner cavity walls opposite to the filtering bin 4 are provided with second sliding grooves 43, the opened end surface of the filtering bin 4 is further provided with limiting grooves 44, the inner cavity of the filtering bin 4 is filled with porous adsorbing materials, the porous adsorbing materials comprise diatoms, activated carbon and activated aluminum, as shown in fig. 6, the opening of the filtering bin 4 is provided with a slidable movable plate 5, the movable plate 5 is connected with a push plate 53 of the inner cavity of the filtering bin 4 through two pull rods 52 of the inner wall of the movable plate 5, the push plate 53 is in sliding connection with the second sliding grooves 43 through a limiting block 54 of the side wall of the push plate 53, the position, corresponding to the limiting grooves 44, of the inner wall of the movable plate 5 is provided with limiting strips 55, the limiting strips 55 are movably connected with the limiting grooves 44 in a clamping manner, and the outer wall of the movable plate 5 is further provided with handles 51 convenient to pull.

The particle filtering device is particularly provided with a U-shaped flow channel, when papermaking wastewater flows out from a pipeline, because the length of the filter bin 4 can not completely block the port of the mounting frame 1, a larger pressure can not be formed at the port, the smooth flow of the wastewater can not be hindered, the wastewater can be divided into two parts, one part is directly filtered by the first filter bin 4, the second part can pass through a gap between the fixed plate 2 and the mounting frame 1, in the process that the wastewater flows through the flow guide fan 3, the flow of the wastewater drives the flow guide fan 3 to rotate endlessly in a circulating way, a vortex is formed at the starting end of the U-shaped channel, the blockage of the channel caused by more and larger particles is avoided, the U-shaped channel can ensure that the largest impurities can be supplied by one of the three filter bins 4, and the flow speed of the wastewater can not be influenced to a larger extent, compromise the consideration of filtration quality and treatment effeciency, and simultaneously, filter storehouse 4 adopts the plug-in design, when filter storehouse 4 damage or need be for upgrading when changing, can take whole filter storehouse 4 out from mounting bracket 1, and, be provided with push pedal 53 in the filter storehouse 4, push pedal 53's size and the inner chamber wall of filtering storehouse 4 are the same, pull handle 51 can drive fly leaf 5 and remove, and then drive push pedal 53 through pull rod 52 from the inner wall roll-off of filtering storehouse 4, push pedal 53 will filter the inside porous adsorption material that has become invalid of storehouse 4 and extrude at the in-process push pedal 53 of roll-off, then can fill in filter storehouse 4 with new material, moreover, the steam generator is simple in operation, and convenient use.

The invention makes up the deficiency of single wastewater treatment by a multi-step comprehensive wastewater treatment process, so that the removal rate of SS, COD, BOD, AOX, lignin, chromaticity and other substances in the wastewater is higher, and in the treatment process, the required equipment is simple, the reuse rate of the wastewater is improved, the pollution degree of wastewater impurity discharge is reduced, and the invention has a wider market application prospect.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims

1. A closed operation zero-discharge process for papermaking wastewater is characterized by comprising the following steps:

2. The closed operation zero emission process of papermaking wastewater as claimed in claim 1, wherein the pretreatment process of papermaking wastewater in S1 is based on a particle filtering device, the device comprises a rectangular mounting frame (1) arranged at the outlet of a wastewater pipeline, three filtering bins (4) are slidably arranged in the mounting frame (1), a U-shaped channel is formed between the three filtering bins (4), two filtering bins (4) slide out from the left side of the mounting frame (1), the other filtering bin (4) slides out from the right side of the mounting frame (1), a fixing plate (2) is arranged in the mounting frame (1) corresponding to the stagnation position of the filtering bins (4), and the top surface and the bottom surface of the mounting frame (1) are provided with a first chute (11) corresponding to the sliding tracks of the filtering bins (4), the utility model discloses a filter, including mounting bracket (1), fixed plate (2), water conservancy diversion fan (3), bearing (31) are all provided with to the junction of water conservancy diversion fan (3) and the two between the inner chamber wall of mounting bracket (1), the both sides of filtering storehouse (4) all are provided with filter screen (41), the top surface and the bottom surface of filtering storehouse (4) correspond the position of spout (11) all are provided with slide rail (42), spout two (43) have all been seted up to two inner chamber walls that filter storehouse (4) is relative, spacing groove (44) have still been seted up to filtering storehouse (4) open-ended terminal surface, just the inner chamber of filtering storehouse (4) is filled with porous adsorption material, the opening part of filtering storehouse (4) is provided with slidable fly leaf (5), fly leaf (5) through two pull rods (52) of its inner wall with push pedal (53) of filtering storehouse (4) inner chamber link to each other, the push plate (53) through the stopper (54) of its lateral wall with spout two (43) sliding connection, the inner wall of fly leaf (5) corresponds the position of spacing groove (44) is provided with spacing strip (55), spacing strip (55) with spacing groove (44) activity joint.

3. The closed operation zero-emission process of papermaking wastewater according to claim 1, characterized in that when anaerobic treatment is performed in S5, a sludge layer is also arranged in the anaerobic tower, the sludge layer is anaerobic granular activated sludge, and comprises hydrolytic acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria, and the use ratio of the hydrolytic acidification bacteria, the hydrogen-producing acetogenic bacteria and the methanogenic bacteria is 1:2: 3.

4. The closed operation zero discharge process of papermaking wastewater as claimed in claim 1, wherein the aerobic biochemical treatment in S6 is a biofilm method, and the carrier organic carrier used in the aerobic biochemical treatment is any one of PVC, PE, PP, resin, plastic, fiber and gelatin.

5. The closed operation zero-emission process of papermaking wastewater according to claim 2, characterized in that the porous adsorption material comprises diatom, activated carbon and activated aluminum.

6. The closed operation zero-emission process of papermaking wastewater according to claim 1, characterized in that a filtering filler layer is arranged inside the settling tower in the step S4, and the filtering filler layer is a spherical filtering filler layer.