CN203229438U - Zero-emission treatment system for paper-making wastewater - Google Patents

Abstract

The utility model provides a zero-discharge treatment system for papermaking wastewater with good wastewater treatment effect, which can be fully recycled in production and realizes zero discharge to the outside. Tower, secondary sedimentation tower and return pool, the outlet of the sump is connected to the water inlet of the filter roller sieve machine through the water pump, the 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 slurry The waste slurry inlet of the collection tank, the outlet of the stirring reaction tower is connected to the water inlet of the first-stage sedimentation tower, the outlet of the first-stage sedimentation tower is connected to the water inlet of the second-stage sedimentation tower, and the outlet of the second-stage sedimentation tower is connected to the return tank through water pipes There is also a biological contact oxidation tank between the primary sedimentation tower and the secondary sedimentation tower. The biological contact oxidation tank is located on the upper part of the air outlet of the trachea with activated sludge filler, and the biological contact oxidation tank is located above the activated sludge filler. With activated carbon fiber silk filter layer.

Description

A zero-discharge treatment system for papermaking wastewater

technical field

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

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

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. the

Utility model content

Therefore, in view of the above-mentioned problems, the utility model provides a papermaking wastewater zero-discharge 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. the

In order to achieve the above purpose, the utility model is achieved through the following technical solutions: a zero discharge treatment system for papermaking wastewater, including a sump, a filter roller sieve machine, a waste pulp collection tank, a stirring reaction tower, a first-stage sedimentation tower, a second-stage Settling tower and 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 slurry The waste slurry inlet of the collection tank, the water outlet of the stirring reaction tower is connected to the primary sedimentation tower, the water outlet of the primary sedimentation tower is connected to the water inlet of the secondary sedimentation tower, and the water outlet of the secondary sedimentation tower passes through the water pipe Connect the backwater tank, the water pipe between the secondary sedimentation tower and the backwater tank is provided with an antifoaming and defoaming agent, and a biological contact oxidation tank is also provided between the first sedimentation tower and the second sedimentation tower, and the biological A trachea is laid on the lower part of the contact oxidation tank, and air outlets are uniformly distributed on the trachea, and one end of the trachea extends out of the tank to connect with the fan, and an activated sludge filler is arranged on the upper part of the air outlet of the trachea in the biological contact oxidation tank, An activated carbon fiber silk filter layer is also arranged above the activated sludge filler in the biological contact oxidation tank. the

It is further improved that: the first-stage sedimentation 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 sewage collection hopper is provided with a mud discharge port, and the tower body is provided with a rapid sedimentation device for rapid sedimentation of solid particles. The tower body is located at the lower part of the rapid sedimentation device and is provided with a buffer tank. Through the tower cover and the quick sedimentation device, it is connected with the buffer tank in the tower body, and the water inlet of the sewage inlet pipe is connected with the water outlet of the stirring reaction tower. the

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. the

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. the

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

A further improvement is: a high-density fiber filament filter layer is provided in the return pool. the

By adopting the above-mentioned technical scheme, the beneficial effect of the utility model is that: the backwater treated by the papermaking wastewater zero-discharge 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. A biological contact oxidation tank is also provided between the first-level sedimentation tower and the second-level sedimentation tower, and a trachea is laid on the lower part of the biological contact oxidation tank. The fan is connected, 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 is constantly moving, so that the waste water and the tank The activated sludge touches each other, making the activated sludge and wastewater fully contact and react, increasing the contact and adsorption opportunities between activated sludge and sewage, effectively improving the degradation ability, effectively degrading color-causing substances in water, removing suspended solids in water, and improving The removal rate of organic matter in sewage can make the COD in wastewater reach the standard discharge. The biological contact oxidation tank is also provided with an activated carbon fiber filter layer above the activated sludge filler. The activated carbon fiber filter layer can treat and purify water, remove color, deodorize, remove organic matter, and intercept suspended solids and biological substances in the water. flocs, further improving the quality of effluent. the

Description of drawings

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

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

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

Detailed ways

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

Example:

Referring to Fig. 1 and Fig. 3, this embodiment discloses a zero-discharge treatment system for papermaking wastewater, including a sump 1, a filter roller sieve machine 2, a waste pulp collection pond 3, a stirring reaction tower 4, a primary sedimentation tower 5, a secondary Settling tower 6 and backwater pool 7, the outlet of described sump 1 is connected to filter roller sieve machine 2 water inlets 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 roller The waste slurry outlet of the 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 tower 5, and the water outlet of the primary sedimentation tower 5 is connected to the secondary The water inlet of the settling tower 6, the bottom of the first-level settling tower 5 is provided with a blowdown outlet, the blowdown outlet is provided with a blowdown valve 56, and the water outlet of the second settling tower 6 is connected to the return pool 7 by a water pipe 9, so A foam suppressing and defoaming agent 8 is provided inside the water pipe 9 between the secondary sedimentation tower 6 and the return pool 7 . A biological contact oxidation tank 10 is also provided between the first-level sedimentation tower 5 and the second-level sedimentation 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, so One end of the air pipe 101 extends out of the pool and is connected with the fan 102. The upper part of the air outlet of the air pipe 101 is provided with an activated sludge filler 103 in the biological contact oxidation tank 10, and the fan can deliver gas to the biological contact oxidation tank through the air pipe, so that The wastewater in the biological contact oxidation tank is constantly moving, so that the wastewater and the activated sludge in the tank touch each other, so that the activated sludge and the wastewater can fully contact and react, increase the contact and adsorption opportunities between the activated sludge and the sewage, and effectively improve the degradation ability. 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. An activated carbon fiber filter layer 104 is also provided above the activated sludge filler 103 in the biological contact oxidation tank 10 . The activated carbon fiber filter layer can treat and purify water, remove color, odor, and organic matter, intercept suspended matter and biological flocs in the water, and improve the quality of the effluent.

With reference to Fig. 2, described primary settling tower comprises tower body 51, is located at tower cover 52 on tower body 51, enters sewage pipe 53, and described tower body 51 top is provided with water outlet 511, and described tower body 51 bottom is provided with There is a dirt collecting hopper 54, the bottom of the dirt collecting hopper 54 is provided with a mud discharge port, the tower body 51 is provided with a quick sedimentation device 55 for rapid sedimentation of solid particles, and the tower body 51 is located at the lower part of the quick sedimentation device 55 A buffer tank 57 is provided, and the water outlet end of the sewage inlet pipe 53 passes through the tower cover 52 and the rapid sedimentation device 55 in turn to connect with the buffer tank 57 in the tower body 51, and the water inlet of the sewage inlet pipe 53 is connected to the stirring reaction tower 4, the rapid sedimentation device 55 includes an outer cylindrical body 551 arranged inside the tower body 51 and an inner cylindrical body 552 arranged in the middle of the inner side of the outer cylindrical body 551 for inserting and perforating the sewage pipe, Between the outer cylindrical body 552 and the inner cylindrical body 551 , there are obliquely and evenly distributed buffering and sedimentation sloping plates 553 along the radial direction. After the wastewater is treated in the stirring reaction tower 4, it enters the sedimentation tower from the sewage inlet pipe, and after being buffered by the buffer tank, it spreads to the surroundings, and then flows steadily to the top of the tower. During the rising process of the sewage, solid suspended matter with a density greater than water, such as filler Inorganic particles such as fine fibers, mud yarn, etc. sink continuously and pass through the rapid sedimentation device to accelerate the sedimentation. Every two buffer sedimentation inclined plates of 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 through the buffer sedimentation device flows into the recovery tank from the water outlet on the upper part of the tower body. the

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

The backwater pool 7 is provided with a high-density fiber filter layer (not shown in the figure), the high-density fiber layer has many gaps and a large specific surface area, and has the function of mechanical interception, which can further purify and intercept the water. Suspended solids and biological flocs in the water ensure the quality of the effluent. the

The return water treated by this papermaking wastewater zero discharge 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. A biological contact oxidation tank is also provided between the first-level sedimentation tower and the second-level sedimentation tower, and a trachea is laid on the lower part of the biological contact oxidation tank. The fan is connected, 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 is constantly moving, so that the waste water and the tank The activated sludge touches each other, making the activated sludge and wastewater fully contact and react, increasing the contact and adsorption opportunities between activated sludge and sewage, effectively improving the degradation ability, effectively degrading color-causing substances in water, removing suspended solids in water, and improving The removal rate of organic matter in sewage can make the COD in wastewater reach the standard discharge. The biological contact oxidation tank is also provided with an activated carbon fiber filter layer above the activated sludge filler. The activated carbon fiber filter layer can treat and purify water, remove color, deodorize, remove organic matter, and intercept suspended solids and biological substances in the water. flocs, further improving the quality of effluent. the

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. the

Claims (6)

1. paper making wastewater zero discharge treatment system, 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 tower, two-stage precipitation tower 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 tower, the water outlet of described one-level settling tower connects the water-in of two-stage precipitation tower, the water outlet of described two-stage precipitation tower connects back pool by water pipe, water pipe inside between described two-stage precipitation tower 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 tower and the two-stage precipitation tower, 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, the top, air outlet that is positioned at tracheae in the described biological contact oxidation pond is provided with the active sludge filler, and the top that is positioned at the active sludge filler in the described biological contact oxidation pond also is provided with activated carbon fiber silk filtering layer.

2. paper making wastewater zero discharge treatment system according to claim 1, it is characterized in that: described one-level settling tower 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, be provided with in the described tower body and allow the rapid precipitation device of solid particulate rapid precipitation, 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 tower lid and rapid precipitation device successively and is linked to each other with dashpot in the tower body, the described water outlet that advances the water-in connection stirring reaction tower of waste pipe.

3. paper making wastewater zero discharge treatment system 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 wastewater zero discharge treatment system 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 wastewater zero discharge treatment system according to claim 1, it is characterized in that: the bottom of described one-level settling tower is provided with wash water valve.

6. paper making wastewater zero discharge treatment system according to claim 1 is characterized in that: be provided with high-density fiber silk filtering layer in the described back pool.

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