CN105800824A - Treatment system for waste water containing hydrazine - Google Patents

Abstract

The invention discloses a hydrazine-containing wastewater treatment system, which comprises a wastewater inlet pipe (1), a connecting pipe (2), a water outlet pipe (3), a dosing pipe (4), an aeration pipe (5), and a return pump (6), catalytic reactor (101), intermediate partition (102), water outlet partition (103), settling tank center tube (201), settling tank (202), catalyst recovery tank (301) and agitator (302) , the waste water inlet pipe (1) is located in the middle of the left side of the catalytic reactor (101) and is 200 mm from the top, the aeration pipe (5) is UPVC as a whole and the pipeline is deep into the reactor from the left side of the catalytic reactor (101), all The cloth aeration port is on the left half of the reactor; the present invention is constantly in contact with the air during the catalytic reaction process, and the liquid is alternately in the aerated state and anaerobic state during the cyclic turning process, so that the catalytic effect can be achieved To achieve the best, so as to fully decompose the hydrazine substances.

Description

A kind of hydrazine-containing wastewater treatment system

technical field

The invention belongs to the technical field of environmental protection, and in particular relates to a hydrazine-containing wastewater treatment system.

Background technique

With the technological innovation and rapid development of the industry, more and more wastewater has the characteristics of refractory biodegradability and high COD. For example, the COD of wastewater produced by the chemical industry can be as high as tens of thousands or even hundreds of thousands of mg per liter. The activated sludge method has been unable to directly treat these wastewaters; at present, the methods for treating high COD wastewater mainly include: 1) biological anaerobic treatment and its combination technology, for example, upflow anaerobic sludge bed (UASB), anaerobic - Aerobic combined technology (A/O), anoxic-anaerobic-aerobic combined technology (A ² O), etc.; 2) Chemical oxidation treatment and its combined technology, for example, electrolysis-aerobic combined technology , Fenton-aerobic combination technology, etc., but the above-mentioned methods all have shortcomings; the defects of biological anaerobic treatment and its combination technology are harsh reaction conditions, complicated device design and maintenance, and exhaustion before the formal device operation. The domestication process of oxygen sludge is long; the disadvantage of chemical oxidation treatment and its combination technology is that the cost of chemicals is high and it is easy to produce highly toxic by-products. How to deal with high COD wastewater has always been a research hotspot in the sewage treatment industry.

Contents of the invention

In order to solve the problems of the prior art, the present invention provides a hydrazine-containing wastewater treatment system, which is mainly designed for the regeneration and recycling of the catalyst, and is constantly in contact with the air during the catalytic reaction process, and is still During the cyclical turning process, the liquid is alternately in the aerated state and the anaerobic state, so that the catalytic effect can be optimized, so that the hydrazine substances can be fully decomposed.

According to the technical solution of the present invention, a hydrazine-containing wastewater treatment system is provided, including a wastewater inlet pipe 1, a connecting pipe 2, an outlet pipe 3, a dosing pipe 4, an aeration pipe 5, a return pump 6, a catalytic reactor 101, an intermediate Separator 102 , water outlet separator 103 , settling tank central cylinder 201 , settling tank 202 , catalyst recovery tank 301 and agitator 302 . The waste water inlet pipe 1 is located in the middle of the left side of the catalytic reactor 101 and is 200mm from the top. The aeration pipe 5 is made of UPVC as a whole, and its pipeline is deep into the reactor from the left side of the catalytic reactor 101. side.

Among them, each hole of the aeration port is arranged with a relative distance of 300mm and a hole with a diameter of 4mm vertically upward, and the bottom of the most end of the pipeline is provided with a 3mm vertically downward hole for drainage; the determination of the aeration volume It is 5 times of the water volume per unit time; the middle partition 102 is located in the middle of the catalytic reactor 101, its top is 500 mm away from the top of the reactor, and the bottom is 300 mm away from the bottom of the reactor. The wall surface is 300mm, its bottom is 300mm from the bottom of the reactor, and the top is 200mm from the top of the reactor; the left end of the connecting pipe 2 is 250mm from the middle position on the right side of the catalytic reactor 101, and the right end enters the settling tank central cylinder 201 and is 100mm from the top surface of the central cylinder.

Further, the central cylinder is located in the middle of the settling tank 202, 200mm from the top and 1200mm from the bottom, and a tapered guiding function is provided at the bottom 100mm; the outlet pipe 3 is located on the right side of the settling tank 202, and the height from the top is 350mm; the top of the catalyst recovery tank 301 is set There is an agitator 302 located in the middle of the catalyst recovery tank, and the height of the stirring blades from the bottom of the catalyst recovery tank 301 is 400 mm.

Compared with the prior art, a kind of hydrazine-containing wastewater treatment system of the present invention has the following technical advantages:

1. The catalyst can be regenerated and reused online repeatedly, which saves a lot of operating costs.

2. The equipment operates completely automatically without human control.

3. The equipment has a compact structure and a large processing load.

Description of drawings

Figure 1 is a process schematic diagram of a hydrazine-containing wastewater treatment system according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them; Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Fig. 1 is the process schematic diagram of the hydrazine-containing wastewater treatment system according to the present invention, wherein the reference signs are as follows: wastewater inlet pipe 1, connecting pipe 2, water outlet pipe 3, dosing pipe 4, aeration pipe 5, return water pump 6, Catalytic reactor 101, intermediate partition 102, water outlet partition 103, settling tank central cylinder 201, settling tank 202, catalyst recovery tank 301 and agitator 302; as shown in Figure 1, waste water inlet pipe 1 is located on the left side of catalytic reactor 101 The middle position of the side is 200mm from the top, the aeration pipe 5 is UPVC as a whole, and its pipeline is deep into the reactor from the left side of the catalytic reactor 101, and the evenly distributed aeration port is on the left half of the reactor, and each port of the aeration port is arranged The holes with a relative spacing of 300mm and aeration port diameter of 4mm are vertically upward, and the bottom of the most end of the pipeline is provided with a 3mm vertically downward hole for drainage. The determination of the aeration rate is 5 times of the water volume per unit time; the middle partition 102 is located in the middle of the catalytic reactor 101, its top is 500 mm away from the top of the reactor, and the bottom is 300 mm away from the bottom of the reactor, and the water outlet partition 103 is located in the catalytic reactor 101 The left side is 300mm away from the right side wall, and its bottom is 300mm away from the bottom of the reactor, and the top is 200mm away from the top of the reactor; The surface is 100mm; the central tube is located in the middle of the settling tank 202, 200mm from the top and 1200mm from the bottom, and a tapered guide is provided at the bottom 100mm; the outlet pipe 3 is located on the right side of the settling tank 202 and the height from the top is 350mm; the top of the catalyst recovery tank 301 is set There is an agitator 302 located in the middle of the catalyst recovery tank, the height of the stirring blade from the bottom of the catalyst recovery tank 301 is 400 mm, and the top is provided with a dosing pipe 4 on the right side, and the distance from the right side is 100 mm; the water inlet of the return pump 6 Connect the outlet end of the pipeline on the right side of the catalyst recovery tank 301 with a height of 200 mm from the bottom to the waste water inlet pipe 1 .

According to the catalytic reactor 101 of the hydrazine-containing wastewater treatment system of the present invention, the settling tank 202 and the catalyst recovery tank 301 are arranged side by side with a distance of 500 mm.

In addition, in the hydrazine-containing wastewater treatment system according to the present invention, the hydrazine-containing wastewater enters the 101 catalytic reactor after being mixed with the catalyst from the catalyst recovery tank through the waste water inlet pipe 1. During the catalytic reaction, Due to the aeration power from the bottom, the relative density on the left side of the equipment is greatly reduced due to the entry of gas, and the liquid level on the left is higher than that on the right due to the pressure balance relationship between the liquid level on the left and the liquid level on the right. Therefore, the liquid on the left side will flow from the top to the right side, so that the liquid in the reactor can be quickly rotated under the continuous promotion of aeration power, and the hydrazine substances in the wastewater are combined with the catalyst copper sulfate and dissolved oxygen. Under the action of decomposing into small molecular substances; the treated wastewater flows out through the 103 water outlet partition, and the wastewater will carry a large amount of copper hydroxide, the product of copper sulfate after the catalytic reaction, into the central cylinder of the 201 settling tank, and pass through The central cylinder flows into the settling tank from the bottom, and because the flow rate is much lower, the copper hydroxide will gradually settle to the bottom of the settling tank, and the settled copper hydroxide will enter the 301 through the sludge discharge pipeline at the bottom. In the catalyst recovery tank, add sulfuric acid solution to the copper hydroxide liquid through the 4 dosing pipes of the catalyst recovery tank. In order to make it fully react during the chemical reaction, the 302 agitator is constantly rotating during the reaction process. , the rotating speed is 60 rpm, the stirring blade is 30cm away from the bottom of the tank, the stirring diameter is 1/2 of the diameter of the tank body, and the area of the stirring blade is 1/30 of the cross section of the tank body. After the reaction, its catalytic effect is restored. The water pump pumps it back to the waste water inlet pipe for catalytic reaction.

The catalyst can be continuously regenerated and recycled; the treated wastewater can enter the anaerobic or aerobic treatment of biological treatment.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made, and it is not necessary and impossible to exhaustively list all the implementation modes here. Changes are still within the protection scope of the present invention.

Claims (5)

1. A hydrazine-containing waste water treatment system, which comprises a waste water inlet pipe (1), a connecting pipe (2), an outlet pipe (3), a dosing pipe (4), an aeration pipe (5), a water return pump (6 ), catalytic reactor (101), intermediate partition 102), water outlet partition (103), settling tank central tube (201), settling tank (202), catalyst recovery tank (301) and agitator (302), which It is characterized in that the wastewater inlet pipe (1) is located in the middle of the left side of the catalytic reactor (101) and is 200 mm from the top, the aeration pipe (5) is made of UPVC as a whole and the pipeline is deep into the reactor from the left side of the catalytic reactor (101) , the evenly distributed aeration port is on the left half of the reactor. 2. The hydrazine-containing wastewater treatment system according to claim 1, wherein each mouth of the aeration port is arranged with a relative spacing of 300mm and the hole whose diameter is 4mm is vertically upward, and the bottom of the most end of the pipeline is provided with a 3mm gap. The vertically downward holes are used for drainage, and the aeration rate is determined to be 5 times of the water volume per unit time. 3. The hydrazine-containing wastewater treatment system according to claim 2, wherein the intermediate partition (102) is positioned in the middle of the catalytic reactor (101), its top is 500mm away from the reactor top, and the bottom is 300mm away from the reactor bottom, and the water outlet The partition (103) is located on the left side of the catalytic reactor (101), 300mm from the right side wall, and its bottom is 300mm from the bottom of the reactor, and the top is 200mm from the top of the reactor. 4. The hydrazine-containing wastewater treatment system according to claim 3, characterized in that the left end of the connecting pipe (2) enters the settling tank central tube (201) from the middle position on the right side of the catalytic reactor (101) from its top 250mm right end And the distance from the top surface of the central cylinder is 100mm. 5. The hydrazine-containing wastewater treatment system according to claim 4, characterized in that, the central cylinder is located in the middle of the settling tank (202), 200mm from the top and 1200mm from the bottom, and the bottom 100mm place is provided with a guiding cone; The water pipe (3) is located on the right side of the settling tank (202) at a height of 350 mm from the top; the top of the catalyst recovery tank (301) is provided with an agitator (302), which is located in the middle of the catalyst recovery tank, and the distance between the stirring blades and the catalyst recovery tank (301) tank The bottom height is 400mm.