CN203079808U - Sewage treatment system capable of realizing sewage zero emission during paper making - Google Patents

Abstract

The utility model relates to a waste water treatment system and provides a sewage treatment system capable of realizing sewage zero emission during paper making. By adopting the sewage treatment system provided by the utility model, the waste water treatment effect is good, all the waste water can be recovered for production, zero emission is realized, pollution is reduced, and production cost is saved. The sewage treatment system comprises a water collecting pool, a filtering rolling screening machine, a waste pulp collecting pool, a stirring reaction tower, a primary settling pool, a secondary settling filtering tower and a water return pool, wherein an outlet of the water collecting pool is connected with a water inlet of the filtering rolling screening machine through a water pump; a water outlet of the filtering rolling screening machine is connected with a water inlet of the stirring reaction tower; a waste pulp outlet of the filtering rolling screening machine is connected with a waste pulp inlet of the waste pulp collecting pool; a water outlet of the stirring reaction tower is connected with a water inlet of the primary settling pool; a water outlet of the primary settling pool is connected with a water inlet of the secondary settling filtering tower; a water outlet of the secondary settling filtering tower is connected with the water return pool through a water pipe; a foam-inhibiting and defoaming agent is arranged in the water pipe between the secondary settling filtering tower and the water return pool; and a biological contact oxidation pool is arranged between the primary settling pool and the secondary settling filtering tower.

Description

A zero-discharge sewage treatment system for papermaking

technical field

The utility model relates to a wastewater treatment system, in particular to a papermaking zero-discharge sewage treatment system.

Background technique

The amount of sewage discharged in our country is very large every year, and the amount discharged after treatment is not much, which has caused great damage to the environment. All major water systems in our country have produced varying degrees of pollution, and the water environment has seriously deteriorated. For a long time, papermaking wastewater has been one of the problems restricting the rapid development of the paper industry. The concentration of pollutants in papermaking wastewater is high, the composition is relatively complex, it contains a large amount of papermaking raw materials and chemicals, and the oxygen consumption is serious, which makes the treatment of papermaking wastewater difficult. One of the industries that pollute the environment. If the papermaking wastewater is directly discharged, it will seriously pollute the environment, so it must be purified.

The existing papermaking sewage treatment device includes a fixed-distance grid machine, a waste water collection tank, an inclined net slurry tank, a sedimentation tank, a sludge recovery tank and a return pool. The outlet of the fixed-distance grid machine is connected to the entrance of the waste water collection tank, and the waste water The outlet of the pool is connected to the inclined net slurry tank, the outlet of the inclined net slurry tank is connected to the entrance of the sedimentation tank, the sludge discharge port of the sedimentation tank is connected to the inlet of the sludge recovery tank, and the outlet of the sedimentation tank is connected to the backwater tank. When the large pieces of suspended or floating dirt in the wastewater are intercepted by the fixed-distance grid machine, they enter the inclined net slurry tank. There is a 70-mesh inclined net in the inclined net slurry tank to filter fine fibers and impurities in the water. The wastewater flowing out of the net fishing slurry tank enters the sedimentation tank for sedimentation treatment, the wastewater treated by the sedimentation tank flows into the backwater tank for reuse, and the sludge in the sedimentation tank is discharged into the mud water recovery tank through the sludge discharge port. This kind of treatment physical and chemical treatment system has simple treatment steps, but the quality of the treated wastewater is not good, and only a small part of SS and COD in the wastewater can be removed. The reused water obtained in this way is easy to deteriorate and smell, and the decolorization effect is not good. Obviously, it cannot effectively degrade the color-causing substances in the water, the removal rate of organic matter in the water is low, the foaming phenomenon of the treated wastewater is serious, the effluent color is deep, and it cannot be recycled for a long time. The COD in the sewage is often discharged beyond the standard, which has an impact on water quality pollution.

Utility model content

Therefore, in view of the above problems, the utility model provides a papermaking zero-discharge sewage treatment system with good wastewater treatment effect, which can be completely recycled in production, realizes zero discharge to the outside, reduces pollution, and saves production costs.

In order to achieve the above purpose, the utility model is realized through the following technical solutions: a zero-discharge sewage treatment system for papermaking, including a sump, a filter rolling screen machine, a waste slurry collection tank, a stirring reaction tower, a primary sedimentation tank, a secondary The sedimentation filter tower and the return pool, the outlet of the sump is connected to the filter roller sieve machine through the water pump, the water outlet of the filter roller sieve machine is connected to the water inlet of the stirring reaction tower, and the waste slurry outlet of the filter roller sieve machine is connected to the waste The waste slurry inlet of the slurry collection tank, the outlet of the stirring reaction tower is connected to the primary sedimentation tank, the water outlet of the primary sedimentation tank is connected to the water inlet of the secondary sedimentation filter tower, and the outlet of the secondary sedimentation filter tower The water outlet is connected to the return pool through a water pipe. The water pipe between the secondary sedimentation filter tower and the return pool is provided with an anti-foaming and defoaming agent. The lower part of the biological contact oxidation tank is laid with a trachea, and the air outlet is evenly distributed on the said trachea. Activated sludge filler.

It is further improved that: the secondary sedimentation and filtration tower includes a tower body, a tower cover arranged on the tower body, and a sewage inlet pipe, the upper part of the tower body is provided with a water outlet, and the lower part of the tower body is provided with a sewage bucket, The lower part of the dirt collecting hopper is provided with a mud discharge port, and the tower body is sequentially provided with a rapid sedimentation device and a packing filter layer for rapid sedimentation of solid particles from bottom to top, and a buffer tank is arranged at the lower part of the tower body , the water outlet end of the sewage inlet pipe passes through the tower cover, the filter packing layer and the rapid sedimentation device in turn to be connected with the buffer tank in the tower body, and the water inlet of the sewage inlet pipe is connected to the water outlet of the biological contact oxidation tank.

A further improvement is: the rapid sedimentation device includes an outer cylindrical body arranged on the inside of the sedimentation and filtration tower body and an inner cylindrical body arranged in the middle of the inner side of the outer cylindrical body for inserting and perforating the sewage pipe. Between the cylinder body and the inner cylinder body, a plurality of buffer sedimentation slant plates are evenly arranged obliquely along the radial direction.

A further improvement is: the stirring reaction tower includes a stirring tower and a stirring device arranged in the stirring tower, the stirring device includes a stirring shaft and stirring blades uniformly distributed on the outside of the stirring shaft circumference, and the lower part of each stirring blade is also There are toggle levers respectively.

A further improvement is: the bottom of the primary sedimentation tank is provided with a sewage outlet, and a sewage valve is provided on the sewage outlet.

By adopting the above-mentioned technical scheme, the beneficial effect of the utility model is: the return water treated by the papermaking zero-discharge sewage treatment system is of good quality, so that the papermaking wastewater can be reused after treatment, and all of it can be reused in production, basically realizing external Zero discharge, not only will not discharge sewage to pollute the environment, but also can save a lot of production costs, reduce waste of resources, can effectively recycle papermaking wastewater, minimize environmental pollution, and this treatment device can also extract waste water from sewage Waste pulp, which can be used to produce egg trays for transporting eggs, so as to realize the benefits of waste recombination and utilization. There is also a biological contact oxidation tank between the first-level sedimentation tank and the second-level sedimentation and filtration tower, and a trachea is laid on the lower part of the biological contact oxidation tank. It is connected with the fan, and the activated sludge filler is arranged on the upper part of the air outlet of the trachea in the biological contact oxidation tank, so that the fan can deliver gas to the biological contact oxidation tank through the trachea, so that the wastewater in the biological contact oxidation tank moves continuously, so that the wastewater and The activated sludge in the pool touches each other, so that the activated sludge and wastewater can fully contact and react, increase the contact and adsorption opportunities between activated sludge and sewage, effectively improve the degradation ability, and can effectively degrade color-causing substances in water and remove suspended solids in water. Improve the removal rate of organic matter in sewage, so that COD in wastewater can reach the standard discharge. the

Description of drawings

Fig. 1 is a schematic flow chart of the utility model embodiment.

Fig. 2 is the structural representation of the secondary sedimentation filter tower of the utility model embodiment.

Fig. 3 is a schematic structural view of the biological contact oxidation tank of the embodiment of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings:

Example:

Referring to Figure 1 and Figure 3, this embodiment discloses a papermaking zero-discharge sewage treatment system, including a water collection tank 1, a filter roller sieve machine 2, a waste slurry collection tank 3, a stirring reaction tower 4, a primary sedimentation tank 5, a secondary Precipitation and filtration tower 6 and backwater pool 7, the outlet of described sump 1 is connected to the water inlet of filter roller sieve machine 2 through water pump 11, and the water outlet of described filter roller sieve machine 2 is connected to the water inlet of stirring reaction tower 4, and described filter The waste slurry outlet of the rolling screen machine 2 is connected to the waste slurry inlet of the waste slurry collection tank 3, the water outlet of the stirring reaction tower 4 is connected to the water inlet of the primary sedimentation tank 5, and the water outlet of the primary sedimentation tank 5 is connected to the two The water inlet of the first-stage sedimentation filter tower 6, the bottom of the first-stage sedimentation tank 5 is provided with a sewage outlet, and the sewage outlet is provided with a sewage valve 52, and the water outlet of the second-stage sedimentation filter tower 6 is connected to the return pool through a water pipe 9 7. A foam suppressing and defoaming agent 8 is provided inside the water pipe 9 between the secondary sedimentation filter tower 6 and the return pool 7 . A biological contact oxidation tank 10 is also provided between the primary sedimentation tank 5 and the secondary sedimentation and filtration tower 6, and a trachea 101 is laid on the lower part of the biological contact oxidation tank 10, and air outlet holes are evenly distributed on the trachea 101. One end of the trachea 101 stretches out of the pool and is connected with the fan 102. The upper part of the air outlet of the trachea 101 in the biological contact oxidation tank 10 is provided with an activated sludge filler 103, and the fan can deliver gas to the biological contact oxidation tank through the trachea. Make the wastewater in the biological contact oxidation tank move continuously, make the wastewater and the activated sludge in the tank touch each other, make the activated sludge and the wastewater fully contact and react, increase the contact and adsorption opportunities between the activated sludge and the sewage, and effectively improve the degradation ability. It can effectively degrade color-causing substances in water, remove suspended solids in water, improve the removal rate of organic matter in sewage, and make COD in wastewater discharge up to the standard.

With reference to Fig. 2, described secondary sedimentation filter tower comprises tower body 61, tower cover 62 that is located on tower body 61, inlet sewage pipe 63, described tower body 61 top is provided with water outlet 611, described tower body 61 bottoms A dirt collecting bucket 64 is provided, and the bottom of the dirt collecting bucket 64 is provided with a mud outlet, and the tower body 61 is sequentially provided with a quick sedimentation device 65 and a packing filter layer 66 for solid particles to settle rapidly from bottom to top. The tower body 61 is located at the bottom of the quick sedimentation device 65 and is provided with a buffer tank 67. The water outlet end of the sewage inlet pipe 63 passes through the tower cover 62, the filter packing layer 66, the quick sedimentation device 65 and the buffer tank in the tower body 61 successively. 67 connected, the water inlet of the sewage pipe 63 is in biological contact with the water outlet of the oxidation tank 10, and the rapid sedimentation device 65 includes an outer cylindrical body 651 arranged on the inner side of the tower body 61 and an outer cylindrical body 651 arranged on the inner side of the outer cylindrical body 651 In the middle part, there is an inner cylindrical body 652 for inserting and perforating the sewage pipe, and between the outer cylindrical body 652 and the inner cylindrical body 651 , buffer sedimentation sloping plates 653 are evenly arranged obliquely along the radial direction. After the wastewater is treated by the biological contact oxidation tank 10, it enters the sedimentation tower from the sewage inlet pipe, and after being buffered by the buffer tank, it diffuses to the surroundings, and then flows steadily to the top of the tower. During the rising process of the sewage, the solid suspended matter with a density greater than that of water is formed. Inorganic particles such as fillers, fine fibers, and mud yarns sink continuously and pass through the rapid sedimentation device to accelerate the sedimentation. Every two buffer sedimentation inclined plates in the buffer sedimentation device are equivalent to a small sedimentation tank, which greatly shortens the particle sedimentation time. , using the principle of vertical flow to achieve the purpose of rapid sedimentation, the sewage flowing from the buffer sedimentation device is further filtered by the filter packing layer and then flows into the recovery tank from the water outlet on the upper part of the tower body.

The stirring reaction tower 4 comprises a stirring tower and a stirring device located in the stirring tower, the stirring device comprises a stirring shaft and stirring blades uniformly distributed on the outside of the stirring shaft circumference, and the bottom of each stirring blade is respectively provided with a dial The moving rod can broaden the stirring range of the stirring device, making the stirring effect better and more uniform.

The return water treated by this papermaking zero-discharge sewage treatment system is of good quality, so that the papermaking wastewater can be reused after treatment, and all of it can be reused in production, basically realizing zero discharge to the outside world, not only will not discharge sewage to pollute the environment, but also can save a lot The production cost reduces the waste of resources, and can effectively recycle papermaking wastewater to minimize environmental pollution, and the treatment device can also extract waste pulp from sewage, which can be used to produce eggs for transporting eggs. To realize the benefit of waste recombination and utilization. There is also a biological contact oxidation tank between the first-level sedimentation tank and the second-level sedimentation and filtration tower, and a trachea is laid on the lower part of the biological contact oxidation tank. It is connected with the fan, and the activated sludge filler is arranged on the upper part of the air outlet of the trachea in the biological contact oxidation tank, so that the fan can deliver gas to the biological contact oxidation tank through the trachea, so that the wastewater in the biological contact oxidation tank moves continuously, so that the wastewater and The activated sludge in the pool touches each other, so that the activated sludge and wastewater can fully contact and react, increase the contact and adsorption opportunities between activated sludge and sewage, effectively improve the degradation ability, and can effectively degrade color-causing substances in water and remove suspended solids in water. Improve the removal rate of organic matter in sewage, so that COD in wastewater can reach the standard discharge.

The above records are only examples of using the technical content of this creation. Any modifications and changes made by those who are familiar with this technology using this creation belong to the scope of patents claimed by this creation, and are not limited to those disclosed in the examples.

Claims (5)

1. paper-making zero discharge Sewage treatment systems, it is characterized in that: comprise water collecting basin, filter the roller screen machine, useless slurry collecting tank, the stirring reaction tower, the one-level settling tank, two-stage precipitation filtration tank and back pool, the outlet of described water collecting basin connects the roller screen machine that filters by water pump, the water outlet of described filtration roller screen machine connects the water-in of stirring reaction tower, the useless slurry outlet of described filtration roller screen machine connects the useless slurry inlet of useless slurry collecting tank, the water outlet of described stirring reaction tower connects the one-level settling tank, the water outlet of described one-level settling tank connects the water-in of two-stage precipitation filtration tank, the water outlet of described two-stage precipitation filtration tank connects back pool by water pipe, water pipe inside between described two-stage precipitation filtration tank and the back pool is provided with and presses down the bubble defoamer, also be provided with biological contact oxidation pond between described one-level settling tank and the two-stage precipitation filtration tank, the bottom is equipped with tracheae in the described biological contact oxidation pond, be evenly equipped with production well on the described tracheae, one end of described tracheae stretches out outside the pond and links to each other with blower fan, and the top, air outlet that is positioned at tracheae in the described biological contact oxidation pond is provided with the active sludge filler.

2. paper-making zero discharge Sewage treatment systems according to claim 1, it is characterized in that: described two-stage precipitation filtration tank comprises tower body, be located at the tower lid on the tower body, advance waste pipe, described tower body top is provided with water outlet, described tower body bottom is provided with dirt collecting bucket, described dirt collecting bucket bottom is provided with mud discharging mouth, in the described tower body by allowing the rapid precipitation device and the filler filtering layer of solid particulate rapid precipitation from last being provided with successively down, be positioned at rapid precipitation device bottom in the described tower body and be provided with dashpot, the described water side of advancing waste pipe is passed the tower lid successively, filter packing layer and rapid precipitation device link to each other with the intravital dashpot of tower, and the described water-in that advances waste pipe connects the water outlet of biological contact oxidation pond.

3. paper-making zero discharge Sewage treatment systems according to claim 2, it is characterized in that: the middle part that described rapid precipitation device comprises the outside cylinder cylindrical shell that is arranged on sedimentation and filtration tower body inboard and is located at outside cylinder cylindrical shell inboard is provided with for advancing the inner cylindrical tube body that waste pipe inserts perforation, radially tiltingly between described outside cylinder cylindrical shell and the inner cylinder body is evenly equipped with a plurality of buffering precipitation inclined plates.

4. paper-making zero discharge Sewage treatment systems according to claim 1, it is characterized in that: described stirring reaction tower comprises the stirring tower and is located at the whipping appts that stirs in the tower, described whipping appts comprises stir shaft and is distributed in the agitating vane of stir shaft periphery that the bottom of described each agitating vane also is respectively equipped with cocking lever.

5. paper-making zero discharge Sewage treatment systems according to claim 1 is characterized in that: the bottom of described one-level settling tank is provided with wash water valve.

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