CN202705197U - Advanced treatment system for paper-making wastewater - Google Patents

Abstract

The utility model relates to a wastewater treatment system, which provides an advanced treatment system for papermaking wastewater that can effectively degrade color-causing substances in water, remove suspended matter in water, and discharge COD in wastewater up to the standard, including a wastewater collection pool, an adjustable aeration pool, Biological contact oxidation tank, sedimentation tower and backwater tank, the outlet of the waste water collection tank is connected to the inlet of the regulating aeration tank, the upper part of the regulating aeration tank is provided with an impeller rotating aeration device, and the outlet of the regulating aeration tank The outlet is connected to the inlet of the biological contact oxidation tank, the outlet of the contact oxidation tank is connected to the inlet of the sedimentation tower, the water outlet of the sedimentation tower is connected to the inlet of the return pool, and the lower part of the biological contact oxidation tank is laid with a trachea, and the trachea Vents are evenly distributed on the top, and one end of the air pipe protrudes out of the tank to connect with the fan, and the biological contact oxidation tank is provided with activated sludge filler on the upper part of the air outlet of the air pipe.

Description

A papermaking wastewater advanced treatment system

technical field

The utility model relates to a wastewater treatment system, in particular to a papermaking wastewater advanced 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. However, the concentration of suspended solids SS and chemical oxygen demand COD in waste paper and papermaking wastewater is relatively high, and COD is composed of insoluble COD and soluble COD. Usually, insoluble COD accounts for the majority of the total COD composition. When SS is removed from wastewater, most of the insoluble COD is removed at the same time. Therefore, the main problem to be solved in the treatment of waste paper and papermaking wastewater is to remove SS and COD. In the prior art papermaking wastewater system, fixed fillers are mainly placed in the biological oxidation decolorization tank to degrade the color-causing substances and suspended solids SS in the wastewater. This treatment tank The decolorization effect is not obvious, the color-causing substances in the water cannot be effectively degraded, the removal rate of organic matter in the water is low, the foaming phenomenon of the treated wastewater is serious, the color of the effluent is deep, and the COD in the wastewater is often discharged beyond the standard.

Utility model content

Therefore, in view of the above problems, the utility model provides a papermaking wastewater advanced treatment system that can effectively degrade color-causing substances in water, remove suspended solids in water, and discharge COD in wastewater up to the standard.

In order to achieve the above object, the utility model is achieved through the following technical solutions: a papermaking wastewater advanced treatment system, including a wastewater collection tank, an adjustable aeration tank, a biological contact oxidation tank, a sedimentation tower and a return pool, the wastewater collection tank The outlet of the adjustable aeration tank is connected to the inlet of the adjustment aeration tank, the upper part of the adjustment aeration tank is provided with an impeller rotating aeration device, the outlet of the adjustment aeration tank is connected to the inlet of the biological contact oxidation tank, and the outlet of the contact oxidation tank It is connected to the entrance of the sedimentation tower, and the water outlet of the sedimentation tower is connected to the inlet of the return pool. It is characterized in that: a trachea is laid on the lower part of the biological contact oxidation tank, and air outlets are evenly distributed on the trachea. One end of the trachea Extending out of the tank and connecting with the fan, the biological contact oxidation tank is provided with activated sludge filler on the upper part of the air outlet of the air pipe.

It is further improved that: the settling 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, the lower part of the tower body is provided with a sewage collection bucket, and the collection The lower part of the dirt hopper is provided with a sludge outlet, 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. The tower body is located at the lower part of the rapid sedimentation device. 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 connect with the buffer tank in the tower body, and the water inlet end of the sewage inlet pipe is connected to the outlet of the biological contact oxidation tank.

By adopting the foregoing technical scheme, the beneficial effect of the utility model is that a trachea is laid in the lower part of the biological contact oxidation tank of the advanced treatment system for papermaking wastewater, and the trachea is evenly distributed with air outlets, and one end of the trachea extends out of the tank The outside is connected to the fan, and the biological contact oxidation tank is equipped with activated sludge filler on the upper part of the air outlet of the trachea, 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, making the wastewater Contact with the activated sludge in the pool, make the activated sludge and wastewater 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.

Description of drawings

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

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

Example:

Referring to Fig. 1 , the present embodiment discloses a papermaking wastewater advanced treatment system, comprising a wastewater collection tank 1, an adjustable aeration tank 2, a biological contact oxidation tank 3, a sedimentation tower 4 and a return tank 5, and the outlet of the wastewater collection tank 1 Connected to the inlet of the adjustment aeration tank 2, the top of the adjustment aeration tank 2 is provided with an impeller rotating aeration device 21, the outlet of the adjustment aeration tank 2 is connected to the inlet of the biological contact oxidation tank 3, and the contact oxidation The outlet of pond 3 is connected to the inlet of sedimentation tower 4, and the water outlet of described sedimentation tower 4 is connected to the inlet of backwater pond 5, wherein:

The lower part of the biological contact oxidation tank 3 is laid with a trachea 31, and the air outlets are evenly distributed on the trachea 31. One end of the trachea 31 stretches out of the pool and is connected with the fan 6. The biological contact oxidation tank 3 is located in the trachea. The upper part of the air outlet of 31 is provided with activated sludge filler 32.

With reference to Fig. 1, described settling tower comprises tower body 41, is located at tower cover 42 on tower body 41, enters sewage pipe 43, and described tower body 1 top is provided with water outlet 411, and described tower body 1 bottom is provided with collector. Dirt hopper 44, the bottom of the dirt collecting hopper 44 is provided with a mud outlet, and the tower body 41 is sequentially provided with a rapid sedimentation device 45 and a filler filter layer 46 for solid particles to settle rapidly from bottom to top in the tower body. A buffer tank 47 is arranged at the lower part of the rapid sedimentation device 45 in the 41, and the water outlet end of the sewage inlet pipe 43 passes through the tower cover 42, the filter packing layer 46 and the rapid sedimentation device 45 to be connected to the buffer tank 47 in the tower body 41 successively. The water inlet end of the sewage inlet pipe 43 is connected to the outlet of the biological contact oxidation tank 3, and the rapid sedimentation device 45 includes an outer cylindrical body 451 arranged on the inner side of the tower body 41 and a middle device arranged on the inner side of the outer cylindrical body 451. There is an inner cylindrical body 452 for the sewage pipe to be inserted into the perforation, and a buffering and sedimentation inclined plate 453 is uniformly arranged obliquely in the radial direction between the outer cylindrical body 452 and the inner cylindrical body 451 . After the wastewater is treated by the biological contact oxidation tank, 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 smoothly 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 from the buffer sedimentation device is further filtered through the filter packing layer and then flows into the recovery tank from the water outlet on the upper part of the tower body.

The lower part of the biological contact oxidation tank of the new papermaking wastewater advanced treatment system is laid with a trachea, and the air outlets are evenly distributed on the trachea, and one end of the trachea extends out of the tank to connect with the fan. The upper part of the air outlet is equipped with activated sludge filler, so that 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 can move continuously, so that the wastewater and the activated sludge in the tank can touch each other, so that the activated sludge Fully contact and react with wastewater, increase the contact and adsorption opportunities between activated sludge and sewage, 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 can be reduced 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 (3)

1. deep treatment system of papermaking wastewater, comprise the wastewater collection pond, regulate the aeration tank, biological contact oxidation pond, settling tower and back pool, the outlet in described wastewater collection pond is connected in the import of regulating the aeration tank, the top of described adjusting aeration tank is provided with the wheel rotation aerating apparatus, the outlet of described adjusting aeration tank connects the import of biological contact oxidation pond, the outlet of described contact-oxidation pool is connected in the entrance of settling tower, the water outlet of described settling tower connects the entrance of back pool, it is characterized in that: 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. deep treatment system of papermaking wastewater according to claim 1, it is characterized in that: described 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, allow rapid precipitation device and the filler filtering layer of solid particulate rapid precipitation by lower from upper being provided with successively in the described tower body, 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 dashpot in the tower body, and the described feed-water end that advances waste pipe connects the outlet of biological contact oxidation pond.

3. deep treatment system of papermaking wastewater 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 precipitation tower body inboard and is located at outside cylinder cylindrical shell inboard is provided with for advancing waste pipe inserts the inner cylindrical tube body of 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.

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