High-salinity high-concentration degradation-resistant wastewater treatment device

Abstract

The utility model discloses a high-salinity high-concentration degradation-resistant wastewater treatment device which comprises a heat exchanger, a separator, a forced circulation pump, an evaporator, a condensate water tank, a thickener, a centrifugal machine, a feeding pump, an air compressor, a primary preheater, a secondary preheater, a reactor, a gas-liquid separator and a scrubber tank. According to the utility model, salt in a salt-containing material can be crystallized into solid to be discharged, the treated wastewater can be directly discharged after reaching the discharge standard, the heat pump system reduces the steam consumption compared with the traditional process, and the operation cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially, it is a kind of high-salt high-concentration difficult degradation wastewater treatment device, it is applied to chemical industry, pharmacy and environmental protection industry. BACKGROUND

[0002] There is a large part of industrial wastewater is high-concentration difficult degradation difficult to handle wastewater, must be handled with other low-concentration wastewater such as cleaning wastewater, domestic wastewater etc. Biochemical treatment technology using microorganism action has been widely applied in wastewater treatment field currently, mainly includes activated sludge method, biological contact oxidation method, biological rotating disc method, tower type biological filter treatment method etc., but due to the toxicity (mainly for toxic organic matter) in wastewater often cannot be effectively removed in pretreatment technology, influences biochemical activity, can only be diluted by water dozens of times, but the toxicity in wastewater exists all the time, not only causes the massive loss of water resources, also seriously pollutes groundwater environment.

[0003] But a serious problem that supercritical water oxidation technology treats industrial wastewater currently faces is that, due to the chlorides about 50% in industrial wastewater, a large amount of acidic material will be produced in the high-temperature high-pressure oxidation reaction process of supercritical water oxidation, has extremely strong corrosiveness, corrosion rate is fast, seriously corrodes the equipment device of metal material, leads to equipment damage, and even causes explosion, and currently there is no metal material that can well resist this corrosion hazard. Based on the above key factors, supercritical water oxidation technology has not been industrialized popularization and application in wastewater treatment field. And the method that the subcritical water oxidation method is handled in combination with biochemical method industrial wastewater, this method adopts subcritical water oxidation method to handle pretreatment industrial wastewater, by reducing reaction temperature and pressure to specific range, can not only greatly reduce the degree of acid corrosion, can also efficiently remove toxic organic matter in wastewater, eliminate toxicity, and retain certain biochemical activity, combined with subsequent biochemical treatment can realize wastewater complete discharge. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of high-salt high-concentration difficult degradation wastewater treatment device, the utility model can effectively remove organic matter, heavy metal and microorganism etc. Pollutants in water, realize wastewater complete discharge.

[0005] To achieve the above object, the utility model provides the following technical scheme: A kind of high-salt high-concentration refractory wastewater treatment device, it is by evaporation crystallization and centrifuge to make the salt of most of high-salt high-concentration refractory wastewater solution in the form of crystalline salt is discharged, the rest of mother liquor is discharged to the required dischargeable concentration after subcritical water oxidation reaction by reactor, including heat exchanger, separator, forced circulation pump, evaporator, condensate tank, thickener, centrifuge, feed pump, air compressor, first preheater, second preheater, reactor, gas-liquid separator and gas washing tank;The shell side outlet of heat exchanger is connected with the water inlet of separator, the separator is connected with evaporator by forced circulation pump and forms circulating heating loop, and the separator, thickener and centrifuge are sequentially connected, and material solid crystalline salt is directly discharged by centrifuge;The condensate outlet of evaporator is connected with the water inlet of condensate tank, the condensate tank is fed by feed pump, and air is mixed by air compressor and sequentially enters the tube side of first preheater and second preheater, the tube side outlet of second preheater is connected with the inlet of the bottom of reactor, the outlet of the top of reactor is connected with the shell side inlet of first preheater, the shell side outlet of first preheater is connected with the tube side inlet of heat exchanger, the tube side outlet of heat exchanger is connected with the water inlet of gas-liquid separator, the water outlet of gas-liquid separator is connected with oxidation liquid buffer tank, and the gas outlet of gas-liquid separator is connected with gas washing tank.

[0006] The utility model further sets up, the gas outlet of the top of separator is connected with the shell side inlet of evaporator by compressor.

[0007] The utility model further sets up, heat exchanger, first preheater and second preheater are tube type heat exchanger or spiral plate heat exchanger or winding tube heat exchanger or plate type heat exchanger.

[0008] The utility model further sets up, compressor is piston compressor or screw rod compressor or centrifugal compressor.

[0009] Compared with prior art, the utility model has the following beneficial effects:

[0010] 1, subcritical oxidation technology can effectively reduce energy consumption, because it can be realized at low temperature oxidation, and traditional oxidation technology needs high temperature to realize oxidation.

[0011] 2, subcritical oxidation technology can effectively reduce the emission of pollutants, because it can be realized at low temperature oxidation, and traditional oxidation technology needs high temperature to realize oxidation, so as to reduce the emission of pollutants.

[0012] 3, subcritical oxidation technology can effectively remove organic matter, heavy metal and microorganism and other pollutants in water, and traditional oxidation technology can only effectively remove organic matter.

[0013] 4. The energy consumption can be effectively reduced by the heat pump system.

[0014] In conclusion, the present application can effectively remove the pollutants such as organic matters, heavy metals and microorganisms in water, and realize complete discharge of wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a high-salt high-concentration refractory wastewater treatment process flow chart.

[0016] In the figure: 1, heat exchanger; 2, separator; 3, forced circulation pump; 4, evaporator; 5, compressor; 6, condenser tank; 7, thickener; 8, centrifuge; 9, feed pump; 10, air compressor; 11, first-stage preheater; 12, second-stage preheater; 13, reactor; 14, gas-liquid separator; 15, gas washing tank. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0018] Embodiment: as shown in the accompanying drawings Figure 1The device for treating high-salt and high-concentration and hard-degradable wastewater includes a heat exchanger 1, a separator 2, a forced circulation pump 3, an evaporator 4, a condensate tank 6, a thickener 7, a centrifuge 8, a feed pump 9, an air compressor 10, a first-stage preheater 11, a second-stage preheater 12, a reactor 13, a gas-liquid separator 142, and a gas washing tank 15. The shell side outlet of the heat exchanger 1 is connected with the water inlet of the separator 2. The separator 2 is connected with the evaporator 4 through the forced circulation pump 3 and forms a circulating heating loop. The separator 2, the thickener 7, and the centrifuge 8 are connected in sequence. The solid crystalline salt of the material is directly discharged through the centrifuge 8. The gas outlet at the top of the separator 2 is connected with the shell side inlet of the evaporator 4 through the compressor 5. The condensate outlet of the evaporator 4 is connected with the water inlet of the condensate tank 6. The condensate tank 6 is fed through the feed pump 9. The air is mixed and sequentially enters the tube side of the first-stage preheater 11 and the second-stage preheater 12 through the air compressor 10. The tube side outlet of the second-stage preheater 12 is connected with the inlet at the bottom of the reactor 13. The outlet at the top of the reactor 13 is connected with the shell side inlet of the first-stage preheater 11. The shell side outlet of the first-stage preheater 11 is connected with the tube side inlet of the heat exchanger 1. The tube side outlet of the heat exchanger 1 is connected with the water inlet of the gas-liquid separator 142. The water outlet of the gas-liquid separator 142 is connected with an oxidizing liquid buffer tank. The gas outlet of the gas-liquid separator 142 is connected with the gas washing tank 15.

[0019] The heat exchanger 1, the first-stage preheater 11, and the second-stage preheater 12 are tube heat exchangers or spiral plate heat exchangers or winding tube heat exchangers or plate heat exchangers. A three-stage preheating system is adopted to heat the raw material to the designed feeding temperature.

[0020] The compressor 5 is a piston compressor or a screw compressor or a centrifugal compressor.

[0021] The evaporator 4, the forced circulation pump 3, and the separator 2 are mainly used for evaporative crystallization of the raw material. The thickener 7 is used for increasing the salt content of the material in the thickener 7. The centrifuge 8 is used for separating the solid-liquid mixture.

[0022] The reactor 13 (a subcritical water oxidation reactor 13) is mainly used for subcritical water oxidation reaction of the filtered industrial wastewater mixed with air (oxygen).

[0023] The compressor 5 is mainly used for pressurizing and heating the material steam at the top of the separator 2. The material steam at the outlet of the compressor 5 provides heat for the evaporator 4, thereby reducing the steam consumption.

[0024] The process flow is as follows: the raw material is fed into the heat exchanger 1 shell side heat exchange and enters the separator 2, the raw material is punched into the evaporator 4 by the forced circulation pump 3, the live steam is introduced for circulating heating, part of the unevaporated liquid enters the thickener 7 through the bottom outlet of the separator 2 and then enters the centrifuge 8 for centrifugation, the centrifuged material solid crystalline salt is directly discharged, the evaporated gas enters the compressor 5 after being heated and pressurized, then is heated again in the shell side of the evaporator 4, the condensed liquid enters the condensate tank 6 and is fed by the feed pump 9, at the same time, the air compressor 10 is opened to introduce air (oxygen) for mixing, enters the primary preheater 11 and the secondary preheater 12 for preheating, then enters the reactor 13 for subcritical water oxidation reaction, the reacted liquid enters the primary preheater 11 shell side and the heat exchanger 1 tube side again for heat exchange and cooling, the cooled liquid enters the gas-liquid separator 142, the obtained liquid phase product directly goes to the oxidation liquid buffer tank from the bottom, the gas phase product goes to the gas washing tank 15 from the top for washing and then is discharged. The problem of treating high-salt high-concentration difficult-to-degrade wastewater is solved, the MVR system reduces the steam consumption, the energy consumption is reduced compared with the traditional process, and the operation cost is saved.

Claims

1. A device for treating high-salt, high-concentration, and recalcitrant wastewater, characterized in that: The system includes a heat exchanger (1), a separator (2), a forced circulation pump (3), an evaporator (4), a condensate tank (6), a thickener (7), a centrifuge (8), a feed pump (9), an air compressor (10), a primary preheater (11), a secondary preheater (12), a reactor (13), a gas-liquid separator (14), and a gas scrubbing tank (15). The shell-side outlet of the heat exchanger (1) is connected to the inlet of the separator (2). The separator (2) is connected to the evaporator (4) via the forced circulation pump (3) to form a circulating heating loop. The separator (2), thickener (7), and centrifuge (8) are connected in sequence, and the solid crystalline salt of the material is directly discharged through the centrifuge (8). The condensate outlet of the evaporator (4) is connected to the condensate tank (6). The water tank (6) is connected to the inlet of the water tank (6). The condensate tank (6) is fed by the feed pump (9) and the air is mixed by the air compressor (10) and enters the tube side of the first preheater (11) and the second preheater (12) in sequence. The tube side outlet of the second preheater (12) is connected to the inlet at the bottom of the reactor (13). The outlet at the top of the reactor (13) is connected to the shell side inlet of the first preheater (11). The shell side outlet of the first preheater (11) is connected to the tube side inlet of the heat exchanger (1). The tube side outlet of the heat exchanger (1) is connected to the inlet of the gas-liquid separator (14). The outlet of the gas-liquid separator (14) is connected to the oxidation liquid buffer tank. The outlet of the gas-liquid separator (14) is connected to the gas washing tank (15).

2. The high-salt, high-concentration, and difficult-to-degrade wastewater treatment device according to claim 1, characterized in that: The outlet at the top of the separator (2) is connected to the shell-side inlet of the evaporator (4) via the compressor (5).

3. The high-salt, high-concentration, and difficult-to-degrade wastewater treatment device according to claim 1, characterized in that: The heat exchanger (1), the primary preheater (11) and the secondary preheater (12) are tubular heat exchangers, spiral plate heat exchangers, wound tube heat exchangers or plate heat exchangers.

4. The high-salt, high-concentration, and difficult-to-degrade wastewater treatment device according to claim 1, characterized in that: The compressor (5) is a piston compressor, a screw compressor, or a centrifugal compressor.

Images