CN112591994A

CN112591994A - Recovery system for papermaking white water

Info

Publication number: CN112591994A
Application number: CN202011457712.8A
Authority: CN
Inventors: 林彬
Original assignee: Xinhui Zhongxin Paper Making Fabric Factory Co ltd
Current assignee: Xinhui Zhongxin Paper Making Fabric Factory Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-04-02

Abstract

The invention belongs to the technical field of papermaking white water recovery, and discloses a papermaking white water recovery system, which comprises a reaction tank, an anaerobic reactor and an aeration tank, wherein a primary sedimentation tank is arranged between the reaction tank and the anaerobic reactor, a secondary sedimentation tank is arranged at one side of the aeration tank, which is far away from the anaerobic reactor, and the reaction tank, the primary sedimentation tank, the anaerobic reactor, the aeration tank and the secondary sedimentation tank are sequentially connected with each other through water pipes. The working efficiency is improved.

Description

Recovery system for papermaking white water

Technical Field

The invention belongs to the technical field of papermaking white water recovery, and particularly relates to a papermaking white water recovery system.

Background

The white water is the waste water of paper making section, which comes from the paper making process in paper making workshop. The white water mainly contains fine fibers, fillers, coatings, dissolved wood components, added sizing materials, wet strength agents, preservatives and the like, is mainly insoluble COD (chemical oxygen demand), is low in biodegradability, and has certain toxicity due to the added preservatives. The white water has larger water quantity, but the organic pollution load of the white water is far lower than that of the black liquor and the middle-stage wastewater. In order to save water consumption, the white water needs to be treated and recycled.

Present papermaking plain boiled water recovery processing is when biochemical treatment stage, generally adopt activated sludge to carry out aerobic treatment, make organic pollutants such as surplus COD in the plain boiled water carry out biochemical reaction with activated sludge, make the organic matter obtain the degradation and get rid of, however, activated sludge is longer with the organic pollutant reaction time in the plain boiled water, the interval time of two plain boiled water processing is longer, work efficiency is low, the practicality is relatively poor, and carry out the inside useless thick liquid of recovery processing's first step in the plain boiled water and need retrieve the plain boiled water, ordinary screen cloth only sets up the individual layer, the screen cloth is easy to be blockked up, and the screen cloth is difficult for changing, be unfavorable for the collection of useless thick liquid simultaneously, functional relatively poor, and easily splash in plain boiled water discharge process, cause operational environment's untidy.

Disclosure of Invention

The invention aims to provide a papermaking white water recovery system, which aims to solve the problems that the degradation reaction time of activated sludge and organic pollutants in white water is long and the filtering and collecting functions of a filter screen on waste pulp are poor in the conventional papermaking white water recovery treatment.

In order to achieve the purpose, the invention provides the following technical scheme: a papermaking white water recovery system comprises a reaction tank, an anaerobic reactor and an aeration tank, wherein a primary sedimentation tank is arranged between the reaction tank and the anaerobic reactor, a secondary sedimentation tank is arranged at one side of the aeration tank far away from the anaerobic reactor, and the reaction tank, the primary sedimentation tank, the anaerobic reactor, the aeration tank and the secondary sedimentation tank are connected with each other through water pipes in turn, the top of the reaction tank is obliquely provided with a feeding cylinder, the top end of the feeding cylinder is provided with a cylinder cover, a liquid inlet pipe is arranged on the cylinder cover, a liquid outlet pipe is arranged on one side wall of the secondary sedimentation tank away from the aeration tank, a charging opening is arranged on one side wall of the charging cylinder, and the inner wall of the top end of the feeding cylinder is provided with a screen, the interior of the aeration tank is added with activated sludge, and a controller is arranged on one side wall of the aeration tank, and five stirring rods are arranged on the inner wall of the aeration tank in a rotating array mode through a rotating shaft.

Preferably, the screen cloth includes one-level sieve, second grade sieve and two fixed curb plates, and coaxial setting from top to bottom of one-level sieve and second grade sieve, and two fixed curb plates all are the arc to along the marginal symmetric distribution of one-level sieve and second grade sieve, the hole of one-level sieve is greater than the hole of second grade sieve, two the top of fixed curb plate is fixed with the link, and when the screen cloth was installed in the feeding section of thick bamboo, the tip at the feeding section of thick bamboo was set up to the link.

Preferably, three baffles are fixed on the inner wall of the reaction tank in a staggered and inclined manner, and the three baffles form an S-shaped flow guide channel in the reaction tank.

Preferably, an air pump is fixed on one side wall of the aeration tank through a fixing plate, an air outlet of the air pump is connected with an air hose, and the air hose leads to the inside of the aeration tank.

Preferably, three V type groove has all been seted up side by side to the inboard bottom of one-level sedimentation tank and second grade sedimentation tank, and the swash plate is all installed to the inner wall, the water inlet end water pipe of one-level sedimentation tank and second grade sedimentation tank all extends to the swash plate below.

Preferably, a motor is fixed on one side wall of the aeration tank through a support, the output end of the motor is rotatably connected with five stirring rods through a rotating shaft, and a valve is arranged on a connecting water pipe at the bottom of the aeration tank.

Compared with the prior art, the invention has the following beneficial effects:

(1) the rotatable stirring rod is arranged in the aeration tank, and the motor is used for driving, so that the activated sludge is fully contacted with the air, the reproduction speed of aerobic microorganisms is increased, the white water is fully contacted with the activated sludge, the adsorption and oxidation effects of sludge floccules on residual organic pollutants in the white water are increased, the reaction time of biochemical treatment is shortened, the interval time of two times of white water treatment is shortened, and the working efficiency is improved.

(2) According to the invention, the inclined feeding cylinder is arranged at the top of the reaction tank, the cylinder cover is arranged at one end of the feeding cylinder, the liquid inlet pipe is arranged on the cylinder cover, splashing of white water everywhere during discharge is effectively avoided, the screen is arranged in one end of the feeding cylinder, the screen is sequentially provided with the first-stage screen plate and the second-stage screen plate from top to bottom, the hole of the first-stage screen plate is larger than that of the second-stage screen plate, waste slurry in the white water is subjected to classified filtration, the problem that the screen is easy to block is effectively solved, the service time of the screen is prolonged, and the screen is hung at the end part of the feeding cylinder through the hanging ring, so that the screen is convenient to disassemble and assemble, is convenient for collecting.

Drawings

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

FIG. 2 is an external view of the present invention;

FIG. 3 is a schematic diagram of the construction of a screen according to the present invention;

in the figure: the device comprises a reaction tank-1, a primary sedimentation tank-2, an anaerobic reactor-3, an aeration tank-4, a secondary sedimentation tank-5, a controller-6, a liquid inlet pipe-7, a liquid outlet pipe-8, a feed inlet-9, a screen-10, a baffle-11, a V-shaped groove-12, an inclined plate-13, a motor-14, a stirring rod-15, an air pump-16, an air hose-17, a valve-18, a fixed side plate-19, a hanging ring-20, a primary sieve plate-21, a secondary sieve plate-22 and a feed cylinder-23.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.

Referring to fig. 1-3, the present invention provides the following technical solutions: a papermaking white water recovery system comprises a reaction tank 1, an anaerobic reactor 3 and an aeration tank 4, wherein a first-stage sedimentation tank 2 is arranged between the reaction tank 1 and the anaerobic reactor 3, a second-stage sedimentation tank 5 is arranged on one side, far away from the anaerobic reactor 3, of the aeration tank 4, the reaction tank 1, the first-stage sedimentation tank 2, the anaerobic reactor 3 and the aeration tank 4 are connected with each other through water pipes in sequence, the three stages of recovery treatment, physicochemical treatment and biochemical treatment are roughly divided, a feeding barrel 23 is obliquely arranged at the top of the reaction tank 1, a barrel cover is arranged at the top end of the feeding barrel 23, a liquid inlet pipe 7 is arranged on the barrel cover, the white water is prevented from splashing everywhere when being discharged, the cleanness of the working environment is ensured, a liquid outlet pipe 8 is arranged on one side wall, far away from the aeration tank 4, of the second-stage sedimentation tank 5, a filling port 9 is arranged, CPAM coagulant, and the top inner wall of feed cylinder 23 installs screen cloth 10, and aeration tank 4's inside adds activated sludge for degrading the organic pollutant that remains in the plain boiled water, and is provided with controller 6 on the aeration tank 4 lateral wall, rotates the array through the pivot on aeration tank 4's the inner wall and installs five puddlers 15, accelerates the reproduction speed of aerobic microorganism in the activated sludge, makes plain boiled water fully contact with it simultaneously, accelerates the degradation rate.

Further, screen cloth 10 includes one-level sieve 21, second grade sieve 22 and two fixed curb plates 19, and coaxial setting from top to bottom of one-level sieve 21 and second grade sieve 22, two fixed curb plates 19 all are the arc, and along the edge symmetric distribution of one-level sieve 21 and second grade sieve 22, the hole of one-level sieve 21 is greater than the hole of second grade sieve 22, the top of two fixed curb plates 19 is fixed with link 20, and when screen cloth 10 installed in feeding section of thick bamboo 23, the tip at feeding section of thick bamboo 23 is set up to link 20, the dismouting of being convenient for, prevent that screen cloth 10 from easily blockking up, and the collection of the useless thick liquid of being convenient for.

Furthermore, three baffles 11 are fixed on the inner wall of the reaction tank 1 in a staggered and inclined manner, and the three baffles 11 form an S-shaped flow guide channel in the reaction tank 1, so that the contact time of the white water and the coagulant is increased, most SS and most COD which are insoluble in water in the white water are effectively adsorbed by the coagulant, and the purification effect is improved.

Specifically, an air pump 16 is fixed on one side wall of the aeration tank 4 through a fixing plate, an air outlet of the air pump 16 is connected with an air hose 17, and the air hose 17 leads to the inside of the aeration tank 4, so that aerobic microorganisms are fully contacted with air, and the propagation speed of the aerobic microorganisms is accelerated.

It is worth explaining that three V type grooves 12 have all been seted up side by side to the inboard bottom of one-level sedimentation tank 2 and second grade sedimentation tank 5, and the precipitate is piled up in V type groove 12, and the swash plate 13 is all installed to the inner wall, and inside adoption honeycomb pipe chute of swash plate 13 packs, and the filler material is polypropylene, and the water pipe of holding of intaking of one-level sedimentation tank 2 and second grade sedimentation tank 5 all extends to swash plate 13 below, and swash plate 13 plays the effect of blockking to the precipitate, avoids it to flow out the sedimentation tank along with white water.

Further, a motor 14 is fixed on one side wall of the aeration tank 4 through a support, the output end of the motor 14 is rotatably connected with five stirring rods 15 through a rotating shaft, and a valve 18 is arranged on a connecting water pipe at the bottom of the aeration tank 4.

The motor 14 and the air pump 16 are both electrically connected with the controller 6, the model of the motor 14 is Y-160M-4, the model of the air pump 16 is DC12/24Viair325C, and the model of the controller 6 is AC-247 ELS.

The working principle and the using process of the invention are as follows: when the invention is used, a worker firstly discharges papermaking white water into the reaction tank 1 from the liquid inlet pipe 7 to avoid splashing of the white water everywhere, the white water firstly passes through the screen 10 in the feeding cylinder 23, and the first-stage screen plate 21 and the second-stage screen plate 22 respectively filter the white water, so that waste pulp in the white water is recovered, the white water can be used as a raw material of low-grade paper for papermaking or sold outside, the economic benefit is improved, the waste water treatment load can be reduced, the medicament consumption is reduced, the white water is subjected to graded filtration by the two-stage screen plates, the problem that the screen 10 is easy to block is effectively solved, the service time of the screen 10 is prolonged, the screen 10 is hung at the end part of the feeding cylinder 23 through the hanging ring 20, the disassembly and the assembly are convenient, the waste pulp is convenient to collect, and the functionality and;

PAC and CPAM coagulant are added into the reaction tank 1 from the feed inlet 9, the filtered white water flows through an S-shaped diversion channel under the action of a baffle 11 in the reaction tank 1, the contact reaction time of the coagulant and the white water is prolonged, so that the coagulant effectively adsorbs most SS and most COD insoluble in the white water and forms floccules, the mixed solution jointly enters the lower part of an inclined plate 13 of the primary sedimentation tank 2 for sedimentation, the sedimentated floccules are accumulated in a V-shaped groove 12, the white water containing COD and BOD5 insoluble in the white water flows into an anaerobic reactor 3, the baffle 11 effectively blocks the floccules, and the anaerobic reactor 3 effectively decomposes most COD and BOD5 in the white water;

the white water after the decomposition flows into the aeration tank 4, the motor 14 and the air pump 16 are started, the air pump 16 continuously conveys air into the aeration tank 4, the motor 14 drives the stirring rod 15 to stir the activated sludge, the activated sludge is fully contacted with the air, the reproduction speed of aerobic microorganisms is accelerated, and the white water is fully contacted with the activated sludge, so that the adsorption and oxidation of sludge floccules on residual organic pollutants in the white water are accelerated, the reaction time of biochemical treatment is reduced, the interval time of two times of white water treatment is shortened, the working efficiency is improved, the degraded mixed liquid enters the secondary sedimentation tank 5 for sedimentation, the white water meeting the requirements at last is discharged from the liquid outlet pipe 8, and the white water is recycled.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A papermaking white water recovery system comprises a reaction tank (1), an anaerobic reactor (3) and an aeration tank (4), and is characterized in that: a primary sedimentation tank (2) is arranged between the reaction tank (1) and the anaerobic reactor (3), one side of the aeration tank (4) far away from the anaerobic reactor (3) is provided with a secondary sedimentation tank (5), the reaction tank (1), the primary sedimentation tank (2), the anaerobic reactor (3), the aeration tank (4) and the secondary sedimentation tank (5) are sequentially connected with each other through water pipes, the top of the reaction tank (1) is obliquely provided with a feeding barrel (23), the top end of the feeding barrel (23) is provided with a barrel cover, the barrel cover is provided with a liquid inlet pipe (7), one side wall of the secondary sedimentation tank (5) far away from the aeration tank (4) is provided with a liquid outlet pipe (8), one side wall of the feeding barrel (23) is provided with a feed inlet (9), the top end inner wall of the feeding barrel (23) is provided with a screen (10), and activated sludge is added in the aeration tank (4), and a controller (6) is arranged on one side wall of the aeration tank (4), and five stirring rods (15) are arranged on the inner wall of the aeration tank (4) in a rotating array mode through a rotating shaft.

2. The papermaking white water recovery system according to claim 1, characterized in that: screen cloth (10) include one-level sieve (21), second grade sieve (22) and two fixed curb plate (19), and coaxial setting about one-level sieve (21) and second grade sieve (22), two fixed curb plate (19) all are the arc to along the marginal symmetric distribution of one-level sieve (21) and second grade sieve (22), the hole of one-level sieve (21) is greater than the hole of second grade sieve (22), two the top of fixed curb plate (19) is fixed with link (20), and when screen cloth (10) was installed in feed cylinder (23), the tip in feed cylinder (23) was set up in link (20).

3. The papermaking white water recovery system according to claim 1, characterized in that: three baffles (11) are fixed on the inner wall of the reaction tank (1) in a staggered and inclined mode, and the three baffles (11) form an S-shaped flow guide channel in the reaction tank (1).

4. The papermaking white water recovery system according to claim 1, characterized in that: an air pump (16) is fixed on one side wall of the aeration tank (4) through a fixing plate, an air outlet of the air pump (16) is connected with an air hose (17), and the air hose (17) leads to the inside of the aeration tank (4).

5. The papermaking white water recovery system according to claim 1, characterized in that: three V type groove (12) have all been seted up side by side to the inboard bottom of one-level sedimentation tank (2) and second grade sedimentation tank (5), and swash plate (13) are all installed to the inner wall, the end water pipe of intaking of one-level sedimentation tank (2) and second grade sedimentation tank (5) all extends to swash plate (13) below.

6. The papermaking white water recovery system according to claim 1, characterized in that: a motor (14) is fixed on one side wall of the aeration tank (4) through a support, the output end of the motor (14) is rotatably connected with five stirring rods (15) through a rotating shaft, and a valve (18) is arranged on a connecting water pipe at the bottom of the aeration tank (4).