CN110902927B - Energy-saving, consumption-reducing and zero-emission treatment method for isosorbide production wastewater - Google Patents
Energy-saving, consumption-reducing and zero-emission treatment method for isosorbide production wastewater Download PDFInfo
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- CN110902927B CN110902927B CN201911230202.4A CN201911230202A CN110902927B CN 110902927 B CN110902927 B CN 110902927B CN 201911230202 A CN201911230202 A CN 201911230202A CN 110902927 B CN110902927 B CN 110902927B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/782—Ozone generators
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Abstract
The invention relates to an isosorbide production wastewater energy-saving consumption-reducing zero-emission treatment method, which belongs to the technical field of wastewater treatment and comprises the steps of filtering a wastewater primary plate frame, carrying out low-pressure distillation by using 3 groups of heat exchangers and a scraper film evaporator, generating high vacuum by utilizing the self-flow effect of a water leg between the heat exchangers and ozone reaction, thus leading the evaporation to be carried out at a lower temperature (50-70 ℃), recycling most heat energy consumed in the evaporation process by using the 3 groups of heat exchangers, further saving energy and reducing consumption, and leading the effluent to reach the national primary emission standard by three-level ozone advanced treatment.
Description
Technical Field
The invention relates to an energy-saving, consumption-reducing and zero-emission treatment method for isosorbide production wastewater, belonging to the technical field of wastewater treatment.
Background
pH value of waste water from isosorbitol production plant is 11.6, conductivity is 22500 mus/cm, CODcr is 152000mg/L, BOD588400mg/L, SS 3600mg/L and TDS 12.3 percent, and is easy to foam. The wastewater has high salt content, high organic matter content, and high alkalinity, and contains sorbitol, alkylbenzene sulfonic acid, sodium hydroxide, isosorbide and other carbohydrates as main ingredients. At present, the treatment mode of the production wastewater of the isosorbide is rarely reported, the conventional treatment method comprises the steps of carrying out biological treatment, then carrying out Fenton advanced treatment, and finally carrying out reverse osmosis treatment, wherein the treated water part is recycled or discharged. However, the conventional treatment method can generate a large amount of sludge, and the final strong brine is difficult to treat, so that the aim of zero emission cannot be achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an energy-saving, consumption-reducing and zero-emission treatment method for isosorbide production wastewater.
The technical scheme of the invention is as follows:
an energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater comprises the following steps:
1. filtering the wastewater in the wastewater tank to remove insoluble suspended matters, and feeding the wastewater into a water storage tank; entering a high-level regulating tank through a No. 1 water lifting pump;
2. the liquid in the high-level regulating tank automatically flows to the No. 1 plate heat exchanger, absorbs the heat in the heat exchanger, is heated, then enters the No. 2 plate heat exchanger, absorbs the latent heat in the heat exchanger to further heat, and then enters the scraper film evaporator;
in the scraper film evaporator, waste water absorbs heat to boil and gasifies, steam enters a No. 2 plate heat exchanger to recover latent heat and provide a heat source for heating, hot condensate water enters a No. 1 plate heat exchanger to further recover heat, the cooled condensate water in the No. 1 plate heat exchanger enters a No. 1 gas-water separator under the action of vacuum, then enters a No. 1 water-sealed tank through a water leg, and then automatically flows into an ozone reactor;
3. the ozone generator generates ozone, the ozone is introduced into the ozone reactor to carry out ozonization reaction, organic matters in the distillate are changed into carbon dioxide and water, and clean water reaching the standard enters the clean water tank to be recycled or is subjected to equipment backwashing;
4. and (3) allowing the residual concentrated solution of the waste water entering the scraper film evaporator after evaporation to enter a 3# plate heat exchanger, allowing the concentrated solution to enter a 2# gas-water separator under the vacuum action, allowing the concentrated solution to enter a 2# water-sealed tank through a water leg, allowing the concentrated solution to automatically flow to a waste water pool, returning to the step (1), and filtering.
Preferably, in step 1, the filtration is performed by using a plate and frame filter press.
Preferably, in the step 1, when the wastewater enters the plate-and-frame filter press for filtering, an electromagnetic metering pump is arranged between the wastewater pool and the plate-and-frame filter press. So as to accurately control the amount of the evaporated water and ensure the normal operation of production.
Preferably, in the step 2, the liquid flows to a No. 1 plate heat exchanger by self-flow, and the temperature is raised to 40-45 ℃.
Preferably, in step 2, the liquid is heated to 45-55 ℃ in a No. 2 plate heat exchanger.
Preferably, in the step 2, the heating of the scraper film evaporator is completed by electromagnetic heating of alkaline water or heat conducting oil or steam.
Preferably, in the step 2, the No. 1 gas-water separator is connected with a vacuum pump, and the vacuum action is completed by the auxiliary water leg of the vacuum pump through vacuum pumping.
Preferably, in step 3, an ozone generator generates ozone, the ozone generator adopts an oxygen source or an air source, and parameters and time of the ozonization reaction are set according to the yield of the ozone generator and the requirements of COD and BOD of the wastewater.
Preferably, in the step 4, an electromagnetic metering pump is arranged between the scraper film evaporator and the No. 3 plate heat exchanger so as to accurately control the evaporation water amount and ensure the normal operation of production.
Preferably, the relative elevation of the water outlet of the No. 2 water-sealed tank in the step 4 is lower than the relative elevation of the lowest water outlet of the scraper film evaporator. Otherwise, the automatic energy-saving operation cannot be realized.
Further preferably, the relative elevation of the water outlet of the No. 2 water-sealed tank in the step 4 is lower than the relative elevation of the lowest water outlet of the scraper film evaporator by 0.5 m or more.
Preferably, the relative elevation of the No. 1 gas-water separator in the step 1 is higher than that of the No. 1 water-sealed tank, and the relative elevation of the No. 2 gas-water separator in the step 4 is higher than that of the No. 2 water-sealed tank.
Preferably, the energy-saving consumption-reducing zero-emission treatment method for the isosorbide production wastewater further comprises a step 5, wherein the clean water tank is connected with a back flushing pump, the back flushing pump is connected with the 1# plate heat exchanger and the 3# plate heat exchanger, and the recovered water in the clean water tank can be used for flushing and deslagging the 1# plate heat exchanger, the 2# plate heat exchanger, the 3# plate heat exchanger and the scraper film evaporator in sequence.
The invention has the beneficial effects that:
the technical scheme of the invention utilizes the self-flowing effect of the water leg to generate high vacuum, thereby leading the evaporation to be carried out at lower temperature (50-70 ℃), saving energy and reducing consumption. And 3 groups of heat exchangers used by the invention recycle most of heat energy consumed in the evaporation process, thereby further saving energy and reducing consumption.
The isosorbide production wastewater treated by the method is a weak alkali liquor containing organic matters, on the premise of ensuring normal production, the water-soluble organic matters in the reclaimed water are thoroughly decomposed into pollution-free carbon dioxide and water by ozone, and the water-soluble organic matters after ozone treatment all reach the standard of reclamation, thereby finally achieving zero discharge of sewage. Through experiments, a primary plate frame is selected for filtration, a secondary low-pressure distillation module and a tertiary ozone advanced treatment module, and the effluent reaches the national primary discharge standard. Because the water quality is good, the water can be completely recycled, and the aim of zero emission is achieved. The whole process saves energy and reduces consumption, and the economic benefit and the environmental benefit are obvious.
Drawings
FIG. 1 is a flow chart of the treatment method of the present invention, in which the solid line is a main flow chart of wastewater treatment and the dotted line is a backwash water flow chart.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
an energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater comprises the following steps:
1. filtering the wastewater in the wastewater tank by a plate-and-frame filter press to remove insoluble suspended matters, and feeding the wastewater into a water storage tank; entering a high-level regulating tank through a No. 1 water lifting pump; the installation ground is a zero line, the relative elevation of the wastewater pool is-1.00 m, and the relative elevation of the high regulating pool is 9.00 m.
2. The liquid in the high-level regulating tank automatically flows to the No. 1 plate heat exchanger, absorbs the heat in the heat exchanger, is heated to 40-45 ℃, then enters the No. 2 plate heat exchanger, absorbs the latent heat in the heat exchanger, is further heated to 45-55 ℃, and then enters the scraper film evaporator; the relative elevation of the No. 1 plate heat exchanger is 9.00 meters, the relative elevation of the No. 2 plate heat exchanger is 9.00 meters, and the relative elevation of the concentrated water outlet of the scraper film evaporator is 2.00 meters.
The heating of the scraper film evaporator is electromagnetic heating, waste water in the scraper film evaporator absorbs heat to boil and gasify, steam enters a No. 2 plate heat exchanger to recover latent heat and provide a heat source for heating, hot condensate water enters a No. 1 plate heat exchanger to further recover heat, the condensate water cooled in the No. 1 plate heat exchanger enters a No. 1 gas-water separator under the action of vacuum, the relative elevation of the No. 1 gas-water separator is 10.00 meters, then the condensate water enters a No. 1 water-sealed tank through a water leg with the relative elevation of 9.50 meters, the relative elevation of the No. 1 water-sealed tank is 1.00 meters, and then the condensate water automatically flows into an ozone reactor, wherein the relative elevation of the ozone reactor is +/-0.00 meter.
3. The ozone generator generates ozone, the ozone is introduced into the ozone reactor to generate ozonization reaction, the ozone generator adopts an oxygen source, the parameters and time of the ozonization reaction are set according to the output of the ozone generator and the requirements of COD and BOD of wastewater, organic matters in distillate are changed into carbon dioxide and water, and clean water reaching the standard enters a clean water tank for recycling or back flushing of equipment.
4. And (2) allowing the residual concentrated solution after the evaporation of the wastewater entering the scraper film evaporator to enter a 3# plate heat exchanger, allowing the 3# plate heat exchanger to have a relative elevation of 9.00 m, allowing the concentrated solution to enter a 2# gas-water separator under the action of vacuum, allowing the 2# gas-water separator to have a relative elevation of 10.00 m, allowing the concentrated solution to enter a 2# water-sealed tank through a water leg with a height of 9 m, allowing the 2# water-sealed tank to have a relative elevation of 1.00 m, allowing the concentrated solution to automatically flow to a wastewater pool, returning to the step (1), and allowing the concentrated solution to enter a filter.
After the treatment of the process, the water quality of the clear water can reach the following indexes:
pH value of water is 6-8, conductivity is less than 100 mus/cm, CODcr is less than 300mg/L, BOD5Less than 80mg/L, ammonia nitrogen less than 10mg/L, SS less than 30mg/L, TDS less than 0.1%.
Example 2:
the energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater comprises the steps as described in example 1, except that in the step 1, when the wastewater enters a plate-and-frame filter press for filtration, an electromagnetic metering pump is arranged between a wastewater pool and the plate-and-frame filter press, and in the step 4, an electromagnetic metering pump is arranged between a scraper film evaporator and a No. 3 plate heat exchanger, so that the evaporation water quantity is accurately controlled, and the normal production is ensured.
Example 3:
the energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater comprises the steps as described in example 1, except that in step 2, a No. 1 gas-water separator is connected with a vacuum pump, and as shown in figure 1, the vacuum pump assists a water leg to vacuumize so as to finish the flow direction of liquid under the vacuum action.
Example 4:
the energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater comprises the steps of embodiment 1, and is different from the steps of 5, connecting a clean water tank with a back flushing pump, connecting the back flushing pump with a 1# plate heat exchanger and a 3# plate heat exchanger, and flushing and deslagging the 1# plate heat exchanger, the 2# plate heat exchanger, the 3# plate heat exchanger and a scraper film evaporator by using recovered water in the clean water tank in sequence, wherein the flushing and deslagging are shown by dotted arrows in figure 1.
Claims (5)
1. An energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater is characterized by comprising the following steps:
(1) filtering the wastewater in the wastewater tank to remove insoluble suspended matters, and feeding the wastewater into a water storage tank; entering a high-level regulating tank through a No. 1 water lifting pump;
(2) the liquid in the high-level regulating tank automatically flows to the No. 1 plate heat exchanger, absorbs the heat in the heat exchanger, is heated to 40-45 ℃, then enters the No. 2 plate heat exchanger, absorbs the latent heat in the heat exchanger, is further heated to 45-55 ℃, and then enters the scraper film evaporator;
heating of the scraper film evaporator is electromagnetic heating, waste water in the scraper film evaporator absorbs heat to boil and gasify, steam enters a No. 2 plate heat exchanger to recover latent heat and provide a heat source for warming, hot condensate water enters a No. 1 plate heat exchanger to further recover heat, the condensate water cooled in the No. 1 plate heat exchanger enters a No. 1 gas-water separator under the action of vacuum, then enters a No. 1 water-sealed tank through a water leg, and then automatically flows into an ozone reactor; the relative elevation of the No. 1 gas-water separator is higher than that of the No. 1 water-sealed tank;
(3) the ozone generator generates ozone, the ozone is introduced into the ozone reactor to generate ozonization reaction, organic matters in the distillate are changed into carbon dioxide and water, and clean water reaching the standard enters the clean water tank to be recycled or is subjected to equipment backwashing;
(4) the residual concentrated solution after the wastewater entering the scraper film evaporator is evaporated enters a 3# plate heat exchanger, then enters a 2# gas-water separator under the vacuum action, then enters a 2# water-sealed tank through a water leg, then automatically flows to a wastewater pool, returns to the step (1), and then enters the filtration;
the relative elevation of the water outlet of the No. 2 water-sealed tank is lower than the relative elevation of the lowest water outlet of the scraper film evaporator by 0.5 m or more; the relative elevation of the No. 2 gas-water separator is higher than that of the No. 2 water-sealed tank.
2. The isosorbide production wastewater energy-saving consumption-reducing zero-emission treatment method as claimed in claim 1, characterized in that in the step (1), the filtration is carried out by using a plate-and-frame filter press;
in the step (1), when the wastewater enters a plate-and-frame filter press for filtering, an electromagnetic metering pump is arranged between the wastewater pool and the plate-and-frame filter press, and in the step (4), an electromagnetic metering pump is arranged between the scraper film evaporator and the No. 3 plate heat exchanger.
3. The isosorbide production wastewater energy saving and consumption reduction zero emission treatment method as claimed in claim 1, characterized in that in step (2), the 1# gas-water separator is connected with a vacuum pump, and the vacuum action is completed by the vacuum pump assisting the water leg to vacuumize.
4. The isosorbide production wastewater energy saving and consumption reduction zero emission treatment method of claim 1, characterized in that in step (3), the ozone generator generates ozone, the ozone generator adopts an oxygen source or an air source, and the parameters and time of the ozonization reaction are set according to the output of the ozone generator and the requirements of COD and BOD of wastewater.
5. The energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater as claimed in claim 1, characterized in that the energy-saving consumption-reducing zero-emission treatment method for isosorbide production wastewater further comprises step (5), wherein the clean water tank is connected with a back flushing pump, the back flushing pump is connected with the 1# plate heat exchanger and the 3# plate heat exchanger, and the recovered water in the clean water tank can be used for flushing and deslagging the 1# plate heat exchanger, the 2# plate heat exchanger, the 3# plate heat exchanger and the scraper film evaporator in sequence.
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