High-salt organic wastewater persulfate advanced oxidation treatment system

Abstract

The utility model relates to an advanced persulfate oxidation treatment system for high-salt organic wastewater, which belongs to the technical field of wastewater treatment and comprises a first heat exchanger, a heater, a pipeline mixer, a dosing device, a thermal reaction tower and a condenser, the cold water inlet end of the first heat exchanger is connected with the water inlet pump, the cold water outlet end of the first heat exchanger is connected with the water inlet end of the heater, the water outlet end of the heater is connected with the water inlet end of the pipeline mixer, the dosing device is arranged between the heater and the pipeline mixer, and the water outlet end of the pipeline mixer is connected with the water inlet end of the thermal reaction tower. The water outlet end of the thermal reaction tower is connected with the hot water inlet end of the first heat exchanger; the top of the thermal reaction tower is connected with the condenser. The treatment system is short in period, low in cost, high in removal rate, simple and convenient in process, quick in effect and free of secondary pollution.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, concretely relates to a kind of high-salinity organic wastewater persulfate advanced oxidation treatment system. BACKGROUND

[0002] High-salinity organic wastewater has the characteristics of high pollutant concentration, complex composition, dispersed pollution source and large discharge amount. If it is discharged directly without proper treatment, it will cause great harm to the surrounding environment. At present, the treatment technology of high-salinity organic wastewater includes physical method, chemical method and biological method. The physical method includes membrane separation technology, etc.; the chemical method includes incineration method, Fenton oxidation method, ozone oxidation method, electrochemical oxidation method and photocatalytic oxidation method; the biological method includes biofilm method and activated sludge method. These methods have the problems of low degradation efficiency, high cost and introduction of new pollutants in the treatment of high-salinity organic wastewater. For example, the Fenton oxidation method has large sludge amount, low efficiency under high chloride ion conditions, difficulty in oxidizing organic phosphorus and no oxidation effect on some organic matter. The structure of organic pollutants in high-salinity organic wastewater is complex, and the salt content is high (>1%), so it is difficult to be treated by biochemical method.

[0003] Therefore, it is necessary to design a high-salinity organic wastewater persulfate advanced oxidation treatment system to overcome the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a kind of high-salinity organic wastewater persulfate advanced oxidation treatment system, with the characteristics of simple operation, good treatment effect, rapid activation, stable operation, strong applicability, etc.

[0005] Advanced oxidation technology has special reaction conditions and high operation control requirements. It can oxidize and degrade organic pollutants and even improve the biodegradability of wastewater. It is mainly used in industrial wastewater recycling, landfill leachate and other difficult-to-degrade organic wastewater, and membrane concentrate treatment. In advanced oxidation technology, persulfate advanced oxidation technology has many advantages. It can treat difficult-to-degrade organic matter in wastewater with short reaction time, high removal rate, low cost, simple process, quick effect, no sludge production and no secondary pollution. It has good application prospect in the field of degrading high-salinity organic wastewater.

[0006] The utility model provides a kind of high-salt organic wastewater persulfate advanced oxidation treatment system, comprising: first heat exchanger, heater, pipeline mixer, dosing device, hot reaction tower and condenser;The cold water inlet end of first heat exchanger is connected with water inlet pump, and the cold water outlet end of first heat exchanger is connected with the water inlet end of heater, and the water outlet end of heater is connected with the water inlet end of pipeline mixer, and dosing device is arranged between heater and pipeline mixer, and the water outlet end of pipeline mixer is connected with the water inlet end of hot reaction tower, and the water outlet end of hot reaction tower is connected with the hot water inlet end of first heat exchanger, and the top of hot reaction tower is connected with condenser.

[0007] Further, it further includes second heat exchanger and cooling circulation tower, and the condensing water inlet of condenser is connected with the cold water outlet end of second heat exchanger, and the cold water inlet end of second heat exchanger is connected with the water outlet end of cooling circulation tower, and the condensing water outlet of condenser is connected with the hot water inlet end of second heat exchanger, and the hot water outlet end of second heat exchanger is connected with the water inlet end of cooling circulation tower.

[0008] Further, first heat exchanger and second heat exchanger are both plate heat exchangers, and the sheet material is titanium material;The area S of first heat exchanger: water inlet pipe pipeline πd 2 The range is 12000~16000, and the area S of second heat exchanger: water inlet pipe pipeline πd 2 The range is 2000~6000.

[0009] Further, a plurality of baffle plates are arranged in the hot reaction tower, and the hot reaction tower is divided into water inlet chamber, reaction chamber and water outlet chamber.

[0010] Further, the plurality of baffle plates include water inlet baffle plate and a plurality of shunt baffle plates, and the water inlet baffle plate and the plurality of shunt baffle plates are arranged in the hot reaction tower in a staggered manner, the water inlet chamber is above the water inlet baffle plate and communicates with the water inlet end of the hot reaction tower, and the lowermost shunt baffle plate communicates with the water outlet end of the hot reaction tower.

[0011] Further, one end of the water inlet baffle plate is fixed below the water inlet end of the hot reaction tower, an overflow plate is arranged on the middle part of the water inlet baffle plate and extends upward, a water inlet guide plate is arranged on the end of the water inlet baffle plate away from the water inlet end of the hot reaction tower and extends downward, and a plurality of water inlet dispersion holes are arranged on the water inlet baffle plate between the overflow plate and the water inlet guide plate.

[0012] Further, one end of the water inlet baffle plate is fixed below the water inlet end of the hot reaction tower, an overflow plate is arranged on the middle part of the water inlet baffle plate and extends upward, a water inlet guide plate is arranged on the end of the water inlet baffle plate away from the water inlet end of the hot reaction tower and extends downward, and a plurality of water inlet dispersion holes are arranged on the water inlet baffle plate between the overflow plate and the water inlet guide plate.

[0013] Further, the water inlet chamber is provided with a pH meter and a first thermometer, and the water outlet chamber is provided with a second thermometer.

[0014] Further, the dosing device includes sodium hydroxide dosing device and persulfate dosing device.

[0015] Further, the heater uses steam heating, and a temperature sensor is arranged in the middle of the water outlet end of the heater, which is connected with a steam control valve at the steam inlet of the steam pipe, for controlling the temperature of the reaction process.

[0016] The utility model has the following advantages and beneficial effects:

[0017] (1) the processing system makes full use of the waste heat of the water outlet of the heat reaction tower, and the cold and hot fluid exchange is carried out between the inlet water in the heat exchanger, so that the inlet water temperature is preheated, and the outlet water temperature is cooled, thereby reducing the operation energy consumption, and reducing the energy consumption cost of the system operation;

[0018] (2) the heat reaction tower of the processing system adopts partitioning by baffle, realizes gradient reaction, and the dispersion hole and the guide plate are additionally arranged in the reaction zone, so that the reaction water body can be dispersed in time, and the reaction fluid is fully mixed through water droplet and impact, and the reaction time is more sufficient;

[0019] (3) the processing system adopts the persulfate advanced oxidation technology, and the ·SO4 - The difficult-to-degrade toxic organic pollutants are effectively decomposed until completely converted into harmless inorganic substances, the reaction time is short, the reaction speed is fast, and the process condition is easy to control to maintain the optimal condition;The persulfate is relatively cheap, has low biological toxicity, is convenient to transport and configure, especially is used for high-salt organic wastewater treatment, does not produce sludge and secondary pollution, is conducive to the green and environmental protection of the disposal process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the high-salt organic wastewater persulfate advanced oxidation treatment system of a preferred embodiment of the utility model;

[0021] Figure 2 It is a structure schematic view of the water inlet baffle of a preferred embodiment of the utility model;

[0022] Figure 3 It is a structure schematic view of the shunt baffle of a preferred embodiment of the utility model;

[0023] EXPLANATION OF DRAWINGS:

[0024] 1. First heat exchanger 1; 1.1. Inlet pump 1.1; 2. Heater 2; 2.1. Steam control valve 2.1; 2.2. Temperature sensor 2.2; 3. Dosing device 3; 4. Pipeline mixer 4; 5. Thermal reaction tower 5; 5.1. First thermometer 5.1; 5.2. pH meter 5.2; 5.3. Inlet baffle 5.3; 5.3.1. Overflow plate 5.3.1; 5.3.2. Inlet guide plate 5.3.2; 5.3.3. Inlet dispersion hole 5.3.3; 5.4. Diversion baffle 5.4; 5.4.1. Diversion guide plate 5.4.1; 5.4.2. Diversion dispersion hole 5.4.2; 5.5. Second thermometer 5.5; 5.6. Outlet control valve 5.6; 6. Condenser 6; 7. Second heat exchanger 7; 8. Cooling circulation tower 8. Detailed Implementation

[0025] To better understand this utility model, the following embodiments are further illustrations of this utility model, but the content of this utility model is not limited to the following embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, a high-salt organic wastewater persulfate advanced oxidation treatment system includes: a first heat exchanger 1, a heater 2, a pipeline mixer 4, a dosing device 3, a thermal reaction tower 5, a condenser 6, a second heat exchanger 7, and a cooling circulation tower 8.

[0028] In this system, the cold inlet of the first heat exchanger 1 is connected to the inlet pump 1.1, and high-salt organic wastewater flows into the cold inlet of the first heat exchanger 1 through the inlet pump 1.1. The cold outlet of the first heat exchanger 1 is connected to the inlet of the heater 2, and the outlet of the heater 2 is connected to the inlet of the pipe mixer 4. A dosing device 3 is installed between the heater 2 and the pipe mixer 4. The outlet of the pipe mixer 4 is connected to the inlet of the thermal reaction tower 5, and the outlet of the thermal reaction tower 5 is connected to the first heat exchanger 1. The condenser 6 is connected to the hot water inlet of the heat exchanger 1 and the top of the heat reaction tower 5. At the same time, the condensate inlet of the condenser 6 is connected to the cold water outlet of the second heat exchanger 7, the cold water inlet of the second heat exchanger 7 is connected to the water outlet of the cooling circulation tower 8, the condensate outlet of the condenser 6 is connected to the hot water inlet of the second heat exchanger 7, and the hot water outlet of the second heat exchanger 7 is connected to the water inlet of the cooling circulation tower 8. This is used to cool the evaporated water vapor and allow the water vapor to flow back into the heat reaction tower 5.

[0029] Both the first heat exchanger 1 and the second heat exchanger 7 are plate heat exchangers, and the plates are made of titanium. The area S of the first heat exchanger 1 is equal to the inlet pipe diameter πd. 2 The range is 12000~16000, the area S of the second heat exchanger 7: inlet water pipe πd 2 Range 2000–6000.

[0030] In the embodiment, the water outlet end of the heater 2 is branched into a dosing pipe with the water inlet end of the pipeline mixer 4, the pipeline mixer 4 adopts a U-shaped pipe connection mode, so that the dosed reagent can be uniformly mixed with the wastewater before entering the reactor. At the same time, the dosing device 3 includes a sodium hydroxide dosing device 3 and a persulfate dosing device 3, so that the pH of the water entering the thermal reaction tower 5 before reaction is above 9, and the mass ratio of the dosing amount of persulfate to COD is 0.03-0.06. The heater 2 adopts steam heating, and a temperature sensor 2.2 is arranged in the middle of the water outlet end of the heater 2, which is connected with a steam control valve 2.1 at the inlet of the steam pipe for controlling the temperature of the reaction process.

[0031] As shown in Figures 1 to 3 , a plurality of partitions are arranged in the thermal reaction tower 5, which divide the reaction tower into a water inlet chamber, a reaction chamber and a water outlet chamber, as shown in Figure 1 ①, ② and ③ parts. The plurality of partitions include a water inlet partition 5.3 and a plurality of shunt partitions 5.4, which are arranged in the thermal reaction tower 5 in an up-down distribution and staggered manner. The water inlet partition 5.3 is above the water inlet chamber and is in communication with the water inlet end of the thermal reaction tower 5. The lowermost shunt partition 5.4 is below the water outlet chamber and is in communication with the water outlet end of the thermal reaction tower 5.

[0032] Specifically, one end of the water inlet partition 5.3 is fixed below the water inlet end of the thermal reaction tower 5, the middle part of the water inlet partition 5.3 extends upward to be provided with an overflow plate 5.3.1, the end of the water inlet partition 5.3 away from the water inlet end of the thermal reaction tower 5 extends downward to be provided with a water inlet flow guide plate 5.3.2, and a plurality of water inlet dispersion holes 5.3.3 are arranged on the water inlet partition 5.3 between the overflow plate 5.3.1 and the water inlet flow guide plate 5.3.2; one end of the shunt partition 5.4 is fixed to the inner wall of the thermal reaction tower 5, a plurality of shunt dispersion holes 5.4.2 are arranged on the shunt partition 5.4, and the other end of the shunt partition 5.4 extends downward to be provided with a shunt flow guide plate 5.4.1. At the same time, a pH meter 5.2 and a first thermometer 5.1 are arranged in the water inlet chamber, and a second thermometer 5.5 is arranged in the water outlet chamber. The thermal reaction tower 5 is a multi-chamber reaction tower, the diameter: height of the reaction tower is 0.1-0.5, and the diameter of the reaction tower: the diameter of the water inlet pipe is 60-120; the diameters of the dispersion holes arranged on the water inlet partition 5.3 and the shunt partition 5.4 are 5-10 mm, and the center distance between the holes is 20-30 mm.

[0033] In actual use, the high-salt organic wastewater mixed uniformly with the additive flows into the water inlet chamber ① formed by the water inlet partition 5.3 of the heat reaction tower 5 through the water inlet end of the heat reaction tower 5, the water inlet chamber ① is provided with a pH meter 5.2 and a first thermometer 5.1 for measuring the pH before the reaction and the reaction temperature, the wastewater flows into the lower reaction chamber ② through the overflow plate 5.3.1, the water inlet partition 5.3 is provided with water inlet dispersion holes 5.3.3 and a water inlet guide plate 5.3.2 for further dispersing and uniformly mixing the wastewater entering the reaction tower, the fluid realizes gradient reaction in the reaction chamber ② which is provided with a plurality of shunt partitions 5.4, the shunt partition 5.4 is provided with a shunt guide plate 5.4.1 and shunt dispersion holes 5.4.2, the liquid after the reaction flows into the water outlet chamber ③, the water outlet chamber ③ is provided with a second thermometer 5.5 for observing the outlet water temperature, the water outlet chamber ③ is connected with the hot water inlet end of the first heat exchanger 1 through the water outlet, the outlet water temperature of the first heat exchanger 1 is high, the heat conduction of the wall surface of the heat exchanger and the water body of the cold water inlet end on the wall surface can make the two kinds of liquids exchange heat, the outlet water control valve 5.6 is connected in series between the water outlet chamber ③ and the first heat exchanger 1 for adjusting the outlet water flow.

[0034] The treatment system adopts the persulfate advanced oxidation technology, generates ·SO4 - The organic pollutants are oxidized and decomposed into harmless inorganic carbon dioxide and water, the heat exchanger is used for heat exchange of the inlet and outlet water, the heating energy consumption is reduced, the reaction energy consumption cost is reduced, the reaction process is fully realized by using the partition in the heat reaction tower 5 to realize gradient reaction, the organic matter removal efficiency is high and the like.

[0035] The above is the preferred embodiment of the utility model, of course, cannot be limited by this to limit the utility model scope, it should be pointed out that, for ordinary skilled person in the art, without departing from the principle of the utility model, can make a number of improvements and changes, these improvements and changes are also considered as the protection scope of the utility model.

Claims

1. A persulfate advanced oxidation treatment system for high-salt organic wastewater, characterized in that, include: The system comprises a first heat exchanger, a heater, a pipe mixer, a dosing device, a thermal reaction tower, and a condenser. The cold inlet of the first heat exchanger is connected to the inlet pump, the cold outlet of the first heat exchanger is connected to the inlet of the heater, the outlet of the heater is connected to the inlet of the pipe mixer, the dosing device is located between the heater and the pipe mixer, the outlet of the pipe mixer is connected to the inlet of the thermal reaction tower, the outlet of the thermal reaction tower is connected to the hot inlet of the first heat exchanger, and the top of the thermal reaction tower is connected to the condenser.

2. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 1, characterized in that: It also includes a second heat exchanger and a cooling circulation tower. The condensate inlet of the condenser is connected to the cold water outlet of the second heat exchanger, the cold water inlet of the second heat exchanger is connected to the water outlet of the cooling circulation tower, the condensate outlet of the condenser is connected to the hot water inlet of the second heat exchanger, and the hot water outlet of the second heat exchanger is connected to the water inlet of the cooling circulation tower.

3. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 2, characterized in that: Both the first and second heat exchangers are plate heat exchangers, and the plates are made of titanium. The area S of the first heat exchanger is equal to the inlet pipe diameter πd. 2 The range is 12000~16000, the area S of the second heat exchanger is: πd of the inlet water pipe 2 Range 2000–6000.

4. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 1, characterized in that: Multiple baffles are installed vertically inside the thermal reaction tower, dividing the tower into an inlet chamber, a reaction chamber, and an outlet chamber.

5. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 4, characterized in that: Multiple baffles include an inlet baffle and multiple diversion baffles. The inlet baffle and multiple diversion baffles are distributed vertically and staggered in the thermal reaction tower. The upper part of the inlet baffle is the inlet chamber, which is connected to the inlet end of the thermal reaction tower. The lower part of the diversion baffle is the outlet chamber, which is connected to the outlet end of the thermal reaction tower.

6. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 5, characterized in that: One end of the water inlet baffle is fixed below the water inlet of the thermal reaction tower. An overflow plate extends upward from the middle of the water inlet baffle. A water inlet guide plate extends downward from the water inlet of the water inlet away from the thermal reaction tower. Multiple water inlet dispersion holes are provided on the water inlet baffle between the overflow plate and the water inlet guide plate.

7. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 5, characterized in that: One end of the flow divider is fixed to the inner wall of the thermal reaction tower. The flow divider is provided with multiple flow divider and dispersion holes. The other end of the flow divider extends downward and is provided with a flow divider guide plate.

8. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 4, characterized in that: The inlet chamber is equipped with a pH meter and a first thermometer, and the outlet chamber is equipped with a second thermometer.

9. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 1, characterized in that: The dosing equipment includes a sodium hydroxide dosing device and a persulfate dosing device.

10. The high-salt organic wastewater persulfate advanced oxidation treatment system as described in claim 1, characterized in that: The heater uses steam heating. A temperature sensor is installed in the middle of the water outlet of the heater. The temperature sensor is connected to the steam control valve at the steam pipe inlet to control the temperature of the reaction process.

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