CN110980923A

CN110980923A - Waste water treatment device

Info

Publication number: CN110980923A
Application number: CN201911415610.7A
Authority: CN
Inventors: 成毅; 何晓秋; 刘廷登; 张云根; 方旭东
Original assignee: Chongqing Changjiang Survey And Design Institute
Current assignee: Chongqing Changjiang Survey And Design Institute
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-10

Abstract

The invention discloses a wastewater treatment device, which comprises an intermediate tank, a reaction tank and a stirring shaft positioned in the reaction tank; the intermediate tank is provided with an intermediate tank inlet and an intermediate tank outlet; a middle through hole communicated with the interior of the tank body is formed in the stirring shaft; the outlet of the intermediate tank is communicated with the intermediate through hole; the inlet of the intermediate tank is communicated with an air source and a reaction liquid source, and the air source is also communicated with the intermediate through hole. The invention solves the problem of insufficient removal of cyanide ions caused by insufficient decomposition or reaction of sodium hypochlorite by gas-liquid matching in the prior art.

Description

Waste water treatment device

Technical Field

The invention relates to the field of water treatment, in particular to a wastewater treatment device.

Background

The electroplating industry relates to the fields of national defense, industry and life. The method is divided into metal electroplating and plastic electroplating of machine parts from the major category, and achieves the effects of corrosion prevention, attractiveness, service life prolonging, appearance decoration and the like of workpieces. The waste water generated by electroplating contains various heavy metal substances and cyanides, and has great harm to soil and water bodies due to great toxicity. Therefore, the wastewater must be strictly treated and discharged after reaching the standard. At present, the treatment of the electroplating wastewater comprises resin exchange, an electrolytic method, a chemical method and air flotation and has various advantages; heavy metal ions are removed firstly, and then cyanide ions are removed. Chemical + precipitation was one of the earliest methods, and after more than 30 years of method exploration, it was returned to the original most effective treatment method. After heavy metal precipitation and recovery, cyanide in the wastewater is treated.

The cyanide is treated mainly with sodium hypochlorite, the amount of the sodium hypochlorite is calculated according to the amount of the sewage to be treated and the concentration of cyanide ions, then a sodium hypochlorite solution is added into the sewage, and the cyanide ions are oxidized into carbon dioxide and nitrogen gas through stirring reaction. However, the reaction rate of this reaction is not high, stirring is required, sodium hypochlorite is unstable and may be partially decomposed after preparation, and decomposition occurs during stirring and sudden addition, resulting in inconsistency between the actual amount and the calculated amount of sodium hypochlorite and insufficient removal of cyanide ions.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a wastewater treatment device, which solves the problem of insufficient cyanide separation removal in the prior art.

In order to achieve the purpose, one technical scheme of the invention is as follows:

a wastewater treatment device comprises an intermediate tank, a reaction tank and a stirring shaft positioned in the reaction tank; the intermediate tank is provided with an intermediate tank inlet and an intermediate tank outlet; a middle through hole communicated with the interior of the tank body is formed in the stirring shaft; the outlet of the intermediate tank is communicated with the intermediate through hole; the inlet of the intermediate tank is communicated with an air source and a reaction liquid source, and the air source is also communicated with the intermediate through hole.

The invention communicates the air source and the middle through hole; and the gas source, the intermediate tank and the intermediate through hole are sequentially communicated, so that the reaction liquid in the intermediate tank can be fed into the reaction tank through the gas source, and the gas can be directly fed into the reaction tank when the reaction liquid is added into the intermediate tank through the stirring shaft, thereby reducing the arrangement of an inlet and an outlet in the reaction tank on one hand, and enabling the liquid and the gas to be fed more uniformly through the stirring shaft on the other hand. The gas source is arranged, on one hand, the deterioration of the reaction liquid can be inhibited by feeding the gas for inhibiting the adverse reaction, and simultaneously, the gas source also can inhibit the deterioration of the reaction liquid

Additional advantages, objects, and features of the above-described aspects will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the above-described aspects.

Drawings

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

FIG. 2 is a schematic view of the construction of a reaction tank;

FIG. 3 is a diagram showing the communication relationship between the pipes;

FIG. 4 is a schematic view of the internal structure of the sealed housing;

FIG. 5 is a schematic view of the connection at the threaded sleeve;

FIG. 6 is a top view of the stirring shaft.

The device comprises an air source 1, a reaction tank 2, a middle tank 3, a stirring shaft 4, a sealing shell 5, a connecting pipe 6, a pressure increasing valve 7, a motor shaft 8, an exhaust device 9, a heating layer 21, a middle tank inlet 31, a middle tank outlet 32, a second electromagnetic valve 33, a stirring part 41, a connecting part 42, a thread sleeve 43, a reinforcing rib 44, an extension arm 45, a mixing hole 46, a middle through hole 47 and a first electromagnetic valve 61.

Detailed Description

In order to make the technical means, creation features, achievement purposes and effects of the technical scheme clearer and easier to understand, the technical scheme is further described in the following combined with specific embodiments:

as shown in fig. 1 to 3, the present invention provides a wastewater treatment apparatus comprising an intermediate tank 3, a reaction tank 2, and a stirring shaft 4 located in the reaction tank 2; the intermediate tank 3 is provided with an intermediate tank inlet 31 and an intermediate tank outlet 32; a middle through hole 47 communicated with the interior of the tank body is formed in the stirring shaft 4; the intermediate tank outlet 32 communicates with the intermediate through hole 47; the intermediate tank inlet 31 is communicated with an air source 1 and a reaction liquid source, and the air source 1 is also communicated with an intermediate through hole 47. When the cyanide-containing wastewater is treated, the reaction solution adopts a sodium hypochlorite solution, the gas source 1 provides chlorine, and the chlorine can be a chlorine generator or a directly purchased chlorine gas source 1. Chlorine can not react with sodium hypochlorite and can restrain the decomposition reaction of sodium hypochlorite, lets in 3 back sodium hypochlorite solutions of pans, can make 3 interior sodium hypochlorite solutions of pans add when and wait to add 2 interior periods of retort that can not take place more decompositions. Simultaneously, after entering retort 2, the chlorine that lets in retort 2 forms gaseous stirring effect, and simultaneously, the sodium hypochlorite that does not fully mix the dilution can not lead to decomposing because of the stirring again. Furthermore, chlorine can also react with cyanide to a lesser extent, preventing the occurrence of clear unclean problems. In treating sewage, the sewage enters through an inlet above the reaction tank 2 without entering through the intermediate pipe, preventing contamination of the intermediate path.

Further, as shown in fig. 4, the stirring shaft 4 is arranged in a vertical direction; the upper end of the stirring shaft 4 is provided with a connecting device, and the connecting device comprises a sealing shell 5 and a motor shaft 8 which are communicated with an air source 1 and a reaction liquid source; the motor shaft 8 is fixedly connected with the upper end of the stirring shaft 4, and the upper end of the stirring shaft 4 is provided with a plurality of radial ports communicated with the inside of the sealed shell 5. Reaction liquid gets into behind the seal shell 5, in getting into middle through-hole 47 through radial mouthful, reaction liquid gets into the back that finishes, lets in gas and also gets into through radial mouthful, is equipped with rotary seal circle between motor shaft 8 and seal shell 5 and (mixing) shaft 4 and the seal shell 5, and the rotational speed of (mixing) shaft 4 is not high, and it is not need big to get into pressure through radial mouthful, and sealed effect can obtain guaranteeing. The connection mode can prevent the liquid leakage from the gap between the through holes in the butt joint of the through holes.

Further, establish connecting pipe 6 of the inside intercommunication of seal shell 5 on the seal shell 5, all be equipped with the solenoid valve on air supply 1, reaction liquid source and the intermediate pipe export and all communicate with connecting pipe 6, the part of intermediate tank import 31 also and connecting pipe 6 between intermediate tank import 31 and intermediate tank export 32 with connecting pipe 6 intercommunication and be equipped with first solenoid valve 61. The number of the interfaces arranged on the sealing shell 5 can be reduced by arranging the connecting pipe 6, and the arrangement of the electromagnetic valve can be conveniently and automatically controlled; and the arrangement of the first electromagnetic valve 61 can distinguish convenient functions. The first solenoid valve 61 is adapted to the solenoid valve at the outlet 32 of the intermediate tank to switch between adding liquid and adding gas to the intermediate tank 3. And a pressure increasing valve 7 is arranged after the gas source 1 is switched on and off, so that enough gas pressure can be ensured to press the reaction liquid in the intermediate tank 3 into the reaction tank 2.

Further, an air outlet is further formed in the intermediate tank 3, and a second electromagnetic valve 33 is arranged outside the air outlet and communicated to a connecting tank behind the first electromagnetic valve 61. In order to ensure that the intermediate tank 3 does not have a residual space for full utilization, the outlet 32 of the intermediate tank is generally positioned at the bottom of the intermediate tank 3, and when reaction liquid is added into the intermediate tank, the intermediate tank needs to be closed, so that gas in the tank is discharged everywhere, and liquid adding is influenced or blocked, therefore, the gas outlet and the second electromagnetic valve 33 are arranged, when liquid is added, the second electromagnetic valve 33 is opened, chlorine is discharged into the reaction tank 2 from the connecting pipe 6, partial chlorine is firstly blended into the wastewater, and the generation of chlorine ions in subsequent reactions is inhibited.

Further, as shown in fig. 5, the stirring shaft 4 includes a connecting portion 42 and a stirring portion 41, the upper end of the stirring portion 41 is sleeved with a threaded sleeve 43, the lower portion of the connecting portion 42 is provided with threads matched with the threaded sleeve 43, and the lower end of the connecting portion 42 and the upper end of the stirring portion 41 are provided with a groove and a protrusion matched with each other to prevent mutual rotation. The upper end of the stirring part 41 is protruded, so that the thread bush 43 is prevented from slipping out, the thread bush 43 is matched and screwed with the lower end of the connecting part 42, the groove and the protrusion are matched and then cannot rotate mutually, and the thread bush 43 is prevented from rotating and loosening through pin limitation after being screwed. The position of the threaded sleeve 43 is always kept higher than the liquid level of the reaction liquid, so that soaking corrosion is prevented.

Further, as shown in fig. 6, the lower portion of the stirring part 41 is provided with a plurality of extension arms 45 along the radial direction of the reaction tank 2, and each extension arm 45 is provided with a plurality of mixing holes 46 along the radial direction of the reaction tank 2. The extension arm 45 is arranged along the radial direction, and the lower end of the stirring part 41 is provided with a disc-shaped structure connected with the extension arm 45; the plurality of mixing holes 46 are provided, and when the stirring rotation is performed, the reaction liquid injection and the chlorine gas introduction can be fully dispersed to the bottom, wherein when the gas introduction is performed, the gas flow and the bubbles are formed to stir the liquid, and the stirring effect is achieved. In the stirring process, the gas flow is disturbed, the reaction liquid is mixed, and chlorine components in the gas can inhibit the formation of sodium hypochlorite to assist the sodium hypochlorite in removing cyanide ions.

Furthermore, the stirring part 41 is made of corrosion-resistant material, and a reinforcing layer is arranged in the stirring part 41. Because the reaction liquid and the chlorine gas have certain corrosivity, the reaction liquid and the chlorine gas are made of corrosion-resistant plastics, and a stainless steel framework is arranged in the reaction liquid and the chlorine gas, so that sufficient torque and connection strength are ensured.

Further, a heating layer 21 is arranged in the shell of the reaction tank 2. The heating layer 21 adopts a heating mode of circulating hot oil, hot oil is added into an interlayer in the shell of the reaction tank 2 for heating, an inlet and an outlet are arranged in the interlayer, the inlet is arranged at the lower part, the outlet is arranged at the upper part, and a heating device for heating the oil is arranged between the inlet and the outlet outside the reaction tank 2 to ensure the temperature.

As described in the scheme, the working process of the invention is as follows: firstly, opening a valve of an air source 1 and a second electromagnetic valve 33, and introducing a small amount of chlorine gas into an intermediate tank 3 and a reaction tank 2; then, introducing the wastewater into a reaction tank 2, closing a valve of a gas source 1, opening a valve of a reaction liquid source, and introducing a sodium hypochlorite solution into an intermediate tank 3; then opening a valve of the gas source 1 and an outlet valve of the intermediate tank, closing the second electromagnetic valve 33, pressing the sodium hypochlorite solution into the reaction tank 2, continuously introducing gas for a period of time, after a period of time, opening a valve of an outlet 32 of the intermediate tank, and opening a first electromagnetic valve 61; air is added intermittently to increase the stirring effect, and the stirring shaft 4 continuously stirs from the beginning of pressing in to the end of reaction.

It is worth to be noted that carbon dioxide and nitrogen are generated in the reaction process, so that the gas at the upper part of the reaction liquid contains chlorine, and the mixed gas of carbon dioxide and nitrogen can be filtered by the exhaust device 9, and then part of the filtered carbon dioxide is used as the gas source 1 to be circularly introduced until the content of the chlorine is too low.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A wastewater treatment device is characterized by comprising an intermediate tank, a reaction tank and a stirring shaft positioned in the reaction tank; the intermediate tank is provided with an intermediate tank inlet and an intermediate tank outlet; a middle through hole communicated with the interior of the tank body is formed in the stirring shaft; the outlet of the intermediate tank is communicated with the intermediate through hole; the inlet of the intermediate tank is communicated with an air source and a reaction liquid source, and the air source is also communicated with the intermediate through hole.

2. The wastewater treatment apparatus according to claim 1, wherein said stirring shaft is disposed in a vertical direction; the upper end of the stirring shaft is provided with a connecting device, and the connecting device comprises a sealing shell and a motor shaft which are communicated with a gas source and a reaction liquid source; the motor shaft is fixedly connected with the upper end of the stirring shaft, and a plurality of radial ports communicated with the inside of the sealing shell are formed in the upper end of the stirring shaft.

3. The wastewater treatment apparatus according to claim 2, wherein the seal housing is provided with a connecting pipe communicated with the interior of the seal housing, the gas source, the reaction solution source and the outlet of the intermediate pipe are respectively provided with a solenoid valve and are respectively communicated with the connecting pipe, the inlet of the intermediate tank is also communicated with the connecting pipe, and the part of the connecting pipe between the inlet of the intermediate tank and the outlet of the intermediate tank is provided with the first solenoid valve.

4. The wastewater treatment plant of claim 3 wherein said gas source switch is followed by a pressure increasing valve.

5. The wastewater treatment device according to claim 4, wherein the intermediate tank is further provided with an air outlet, and a second electromagnetic valve is arranged outside the air outlet and communicated with a connecting pipe behind the first electromagnetic valve.

6. The wastewater treatment device according to any one of claims 1 to 5, wherein the stirring shaft comprises a connecting part and a stirring part, a thread sleeve is sleeved on the upper end of the stirring part, a thread matched with the thread sleeve is arranged on the lower part of the connecting part, and a groove and a protrusion which are matched with each other to prevent mutual rotation are arranged on the lower end of the connecting part and the upper end of the stirring part.

7. The wastewater treatment apparatus according to claim 6, wherein the lower portion of the stirring section is provided with a plurality of extension arms in the radial direction of the reaction tank, and each of the extension arms is provided with a plurality of mixing holes in the radial direction of the reaction tank.

8. The wastewater treatment apparatus according to claim 7, wherein the stirring section is made of a corrosion-resistant material, and a reinforcing layer is provided in the stirring section.

9. The wastewater treatment apparatus according to claim 8, wherein a heating layer is provided in the housing of the reaction tank.