CN115893708A - Incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment - Google Patents
Incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment Download PDFInfo
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Abstract
The invention discloses a process for incineration and pyrolysis treatment after pretreatment of phenol-ammonia wastewater, which comprises units such as static pressure and steady flow oil-water separation, advection drainage and oil drainage, low-temperature deamination, ammonia gas absorption, waste water incineration and pyrolysis, waste heat steam boiler, flue gas desulfurization and denitrification treatment and the like. Tar in the phenol-ammonia wastewater is removed by setting static pressure steady flow oil-water separation and advection drainage gas separation, then ammonia gas in the phenol-ammonia wastewater is blown out by a low-temperature deamination unit, and the ammonia gas is recovered by an ammonia gas absorption unit; then, the waste water incineration pyrolysis unit is used for carrying out high-temperature incineration pyrolysis on high-concentration organic pollutants in the waste water by taking the surplus raw coke oven gas of the enterprise as a fuel to generate CO 2 、H 2 O、SO 2 NOx and the like, and the heat of the pyrolysis flue gas is recovered by a waste heat steam boiler; finally, the flue gas is subjected to desulfurization and denitrification treatment and then is discharged after reaching the standard. The process can reduce the environmental pollution caused by the diffusion of the surplus crude gas of enterprises through a torch, and can obtain valuable byproducts such as ammonium sulfate, hot steam and the like, thereby realizing the recycling of resources.
Description
Technical Field
The invention relates to the technical field of phenol-ammonia wastewater treatment of coal chemical semi-coke production enterprises, in particular to a process for incineration pyrolysis treatment after phenol-ammonia wastewater pretreatment.
Background
The coal chemical industry and semicoke industry utilize low-rank coal to carry out pyrolysis quality improvement, promote the development and the application of clean refining high-efficient utilization of low-rank coal, but phenol ammonia waste water that produces in the clean refining process of low-rank coal pyrolysis quality improvement is difficult to handle, and phenol ammonia waste water contains a large amount of tar, phenols, ammonia nitrogen, polycyclic aromatic hydrocarbon compounds and heterocyclic compounds containing nitrogen, oxygen, sulphur etc. very typical contains industrial waste water of difficult degradation organic compound.
At present, the processes mainly adopted by domestic similar projects are oil removal, ammonia evaporation, dephenolization, biochemistry and depthThe treatment process is suitable for semicoke production enterprises with large production scale and large production wastewater production amount, a large amount of chemical agents are required to be added in the processes of oil removal, ammonia evaporation and phenol removal in the process route, the normal operation of subsequent biochemical units is difficult to ensure, and meanwhile, the treatment process has the problems of high construction investment, long construction period, large occupied area and the like, which are always the headaches in coking enterprises. Therefore, the amount of wastewater produced is 150m for smaller production scale 3 And about/d semicoke production enterprises are very necessary to develop an innovative phenol-ammonia wastewater treatment process route.
Disclosure of Invention
The invention aims to provide a process for treating phenol-ammonia wastewater by incineration and pyrolysis after pretreatment, which is used for reducing the discharge of wastewater, consuming redundant raw gas and producing valuable byproducts such as ammonium sulfate, hot steam and the like.
In order to achieve the purpose, the invention provides the following technical scheme: a process for treating phenol-ammonia wastewater by post-pretreatment incineration pyrolysis comprises the steps of static pressure and steady flow oil-water separation, advection drainage and oil separation, low-temperature deamination, waste water incineration pyrolysis, waste heat steam boiler and flue gas desulfurization and denitrification. The process flow is as follows:
A. static pressure and steady flow oil-water separation: lifting the phenol-ammonia wastewater to a static pressure steady flow oil-water separator by a pump for one time, removing coal tar in the wastewater by utilizing the action of gravity in the environment of static pressure and steady flow, and reducing petroleum pollutants in the wastewater;
B. advection drainage and oil drainage: the phenol-ammonia wastewater after the oil-water separation and oil-removal treatment by static pressure and steady flow automatically flows into an advection guide and drainage oil tank, coal tar and suspended colloidal impurities in the wastewater are further removed by sedimentation, meanwhile, floating oil such as micro oil beads and emulsified oil in the wastewater are removed by an oil scraper, and finally, the oil-separation effect of the wastewater is realized;
C. low-temperature deamination: after oil is removed, the phenol ammonia wastewater enters a low-temperature deamination unit to blow off ammonia gas and separate the ammonia gas;
D. ammonia gas absorption: introducing ammonia escaped from the wastewater treated by the low-temperature deamination unit into an ammonia absorption tower, and recovering the ammonia by spraying and washing with a sulfuric acid solution;
E. waste water incineration and pyrolysis: the phenol-ammonia wastewater after oil removal and deamination treatment enters an incineration pyrolysis unit, so that various pollutants such as hydrocarbons, phenols, ammonia nitrogen and the like in the wastewater are subjected to chemical and physicochemical changes and converted into nontoxic high-temperature gaseous inorganic substances;
F. a waste heat steam boiler: the waste heat steam boiler is used for recycling heat energy in the flue gas and cooling the flue gas;
G. flue gas desulfurization and denitration treatment: after the heat energy of the flue gas generated by the waste water incineration and pyrolysis is recovered by a waste heat steam boiler, the flue gas is subjected to desulfurization and denitration treatment, and then the flue gas is discharged up to the standard.
Preferably, the static pressure and steady flow oil-water separation device is characterized in that after phenol-ammonia wastewater is lifted by a pump for one time, the wastewater enters a static pressure and steady flow area in the device to be subjected to oil-water separation under the action of gravity, light oil in the wastewater floats on an upper layer and is discharged through an oil removal port in the upper part of the device, heavy oil in the wastewater is settled to a lower layer and is discharged through an oil discharge port in the bottom of the device, meanwhile, a heating coil is arranged at the bottom of the device to prevent the settled heavy oil from being solidified, and the wastewater after oil removal automatically flows into the next unit.
Preferably, the horizontal flow type drainage oil tank is used for settling colloid and impurities suspended in the wastewater from a water body so as to further remove petroleum and SS, the wastewater enters from one end and flows out from the other end, the flow guide wall is arranged in the tank, the horizontal flow direction distance of the wastewater can be prolonged, the horizontal flow velocity of the wastewater is reduced, and the relative density is less than 1.0g/cm 3 And the oil impurities with larger particle size float upwards under the action of buoyancy and gather on the surface of the pool, then floating oil is collected and removed through an oil scraper and an oil skimming groove which are arranged on the surface of the pool, and the relative density of the waste water is larger than that of water, and the waste water is settled at the bottom of the pool body through the settling action and is discharged through a mud pipe.
Preferably, the static pressure steady flow oil-water separation device and the advection type guide-drainage oil-extraction tank are combined in series, so that the oil removal effect of the phenol-ammonia wastewater can be enhanced, the removal rate of coal tar in the phenol-ammonia wastewater can reach more than 93%, the removal rate of COD can reach about 20%, and the coal tar concentration of the treated wastewater is less than or equal to 150mg/L.
Preferably, the horizontal low-temperature ammonia stripping device is used for removing ammonia in the wastewaterThe ammonia nitrogen in the phenol ammonia wastewater is mostly ammonium ion (NH) 4+ ) And free ammonia (NH) 3 ) A state of (2) exists, the two are in equilibrium, i.e.
This relationship is influenced by the pH and temperature, and when the pH of the wastewater in the apparatus is adjusted to 11, the wastewater is heated and kept above 50 ℃, the equilibrium reaction moves to the right, and free NH is formed 3 The occupied proportion is increased, and a plurality of groups of perforated aeration pipes in the device are reused for aeration and stripping of free NH 3 Free NH of 3 Separated out, further removes ammonia nitrogen in the phenol ammonia wastewater, reduces the generation of combustion NO in the phenol ammonia wastewater in the subsequent incineration and pyrolysis process x And the treatment difficulty of the flue gas denitration workshop section is reduced.
Preferably, the ammonia absorption tower is filled with sulfuric acid solution for spray washing, so that ammonia blown off in the step D is absorbed, and the generated ammonium sulfate byproduct can be used as a fertilizer or a humic acid fertilizer additive, so that ammonia in the wastewater is recycled.
Preferably, the phenol-ammonia wastewater incineration pyrolysis furnace uses residual raw gas generated by clean and efficient utilization of semi-coke enterprise coal as fuel, the pretreated phenol-ammonia wastewater is incinerated and pyrolyzed, the phenol-ammonia wastewater is sprayed into the pyrolysis furnace in a mist form through a high-pressure atomizing spray gun to be fully combusted, and various pollutants such as hydrocarbons, phenols, ammonia nitrogen and the like in the wastewater are incinerated and pyrolyzed to be converted into non-toxic high-temperature gaseous inorganic substance H 2 O、CO 2 、NO X While trace amount of H in the raw gas 2 Conversion of S to SO 2 。
Preferably, waste heat steam boiler carries out the heat transfer to burning pyrolysis flue gas, makes the flue gas temperature reduce, retrieves the heat energy of burning pyrolysis flue gas simultaneously, as the heat source of other productions of supply semicoke enterprise.
Preferably, the flue gas desulfurization and denitrification device is used for treating incineration pyrolysis flue gas and removing SO in the flue gas 2 And NO X Wherein the desulfurizing device can adopt one of ammonia method, limestone (lime) -gypsum wet method, double-alkali method and the like, and the denitrifying device can adopt SNCR, SCR and the likeAnd in the formula denitration, ammonia, urea and the like are used as denitration reducing agents, so that the smoke is finally discharged up to the standard.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention realizes the full recovery of valuable resources in the phenol-ammonia wastewater, improves the coal tar removal rate in the phenol-ammonia wastewater and strengthens the tar recovery of the phenol-ammonia wastewater through the two-stage serial combination of the static pressure steady flow oil-water separation device and the horizontal flow type drainage oil-separating tank. Meanwhile, the horizontal low-temperature ammonia stripping device and the ammonia absorption tower can well remove and recycle ammonia in the wastewater.
2. Waste water burns the pyrolysis oven and passes through the chemical reaction of waste water high temperature combustion oxidation, with high concentration organic pollutant such as the difficult phenol of handling in the phenol ammonia waste water, cyanide, converts the mature and easy inorganic gaseous pollutant of handling of treatment process into, makes high concentration phenol ammonia waste water obtain thoroughly processing, realizes enterprise's waste water zero release, and the flue gas realizes discharge to reach standard easily after handling, can not cause the pollution to the environment.
3. The waste water incineration pyrolysis furnace takes the surplus crude gas of a semi-coke enterprise as fuel, realizes the comprehensive utilization of the gas and solves the problem that the surplus crude gas torch of the enterprise has long term and causes the pollution to the atmospheric environment; the waste heat steam boiler recovers heat energy, so that energy is recycled, and the cost of steam, electric power and the like is saved for enterprises.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a process for incineration and pyrolysis treatment of phenol-ammonia wastewater after pretreatment comprises static pressure steady flow oil-water separation, advection drainage and oil drainage, low temperature deamination, waste water incineration and pyrolysis, waste heat steam boiler, and flue gas desulfurization and denitrification. The process flow is as follows:
A. static pressure and steady flow oil-water separation: the wastewater is lifted by a pump for one time and then enters a static pressure steady flow oil-water separator to remove coal tar by utilizing the physical gravity settling action under the condition of static pressure and steady flow;
B. advection drainage and oil drainage: the phenol-ammonia wastewater subjected to the oil-water separation and oil-removal treatment by static pressure and flow stabilization automatically flows into a advection guide and drainage oil-separating tank, coal tar and suspended colloidal impurities in the wastewater are further removed by sedimentation, meanwhile, micro oil droplets, emulsified oil and the like in the wastewater float upwards and are removed by an oil scraper, and finally, the wastewater-oil separation effect is realized;
C. low-temperature deamination: after oil is removed, the phenol ammonia wastewater enters a low-temperature deamination unit to blow off ammonia gas and separate the ammonia gas;
D. ammonia gas absorption: introducing ammonia escaped from the wastewater treated by the low-temperature deamination unit into an ammonia absorption tower, and recovering the ammonia by spraying and washing with a dilute sulfuric acid solution;
E. waste water incineration and pyrolysis: the phenol-ammonia wastewater after oil removal and deamination treatment enters an incineration pyrolysis unit, so that various pollutants such as hydrocarbons, phenols, ammonia nitrogen and the like in the wastewater are subjected to chemical and physicochemical changes and converted into nontoxic high-temperature gaseous inorganic substances;
F. a waste heat steam boiler: the waste heat steam boiler is used for recycling heat energy in the flue gas and cooling the flue gas;
G. flue gas desulfurization and denitration treatment: after the heat energy of the flue gas generated by the waste water incineration and pyrolysis is recovered by a waste heat steam boiler, the flue gas is subjected to desulfurization tower and denitration treatment, and then the flue gas is discharged up to the standard.
Specifically, the static pressure steady flow oil-water separation device has the hydraulic retention time of 150h, waste water is subjected to oil-water separation in a static pressure steady flow area in the device, light oil in the waste water floats on the upper layer and is discharged through an oil removal port in the upper part of the device, heavy oil in the waste water is settled to the lower layer and is discharged through an oil discharge port in the bottom of the device, meanwhile, a heating coil is arranged at the bottom of the device, the heating is carried out by utilizing steam to prevent the settled heavy oil from being solidified, and the waste water is kept at about 40 ℃.
In particular, it is flatA flow guide wall is arranged in the flow type drainage and oil separation pool, the horizontal flow velocity is 2-5mm/s, the hydraulic retention time is 20h, the floating oil in the wastewater naturally floats upwards, the floating oil in the phenol-ammonia wastewater is separated and removed, and the relative density is less than 1.0g/cm 3 And the oil product impurities with larger particle sizes float upwards and gather on the surface of the pool, then floating oil is collected and removed through an oil skimming groove and an oil scraper arranged on the surface of the pool, the moving speed of the oil scraper is 0.01m/s, and the settled SS is discharged through a mud discharge pipe.
Specifically, the static pressure steady flow oil-water separation device and the advection type guide-drainage oil-extraction tank are combined in series, so that the oil removal effect of the phenol-ammonia wastewater can be enhanced, the removal rate of coal tar in the phenol-ammonia wastewater can reach more than 93%, the removal rate of COD can reach about 20%, and the coal tar concentration of the treated wastewater is less than or equal to 150mg/L.
Specifically, the horizontal low-temperature ammonia stripping device blows out ammonia in the wastewater, the pH value of the wastewater in the device is adjusted to 11, the wastewater is heated and kept at more than 50 ℃, and then a plurality of groups of perforated aeration pipes in the device are utilized for aeration stripping for 4 hours to enable free NH 3 The ammonia nitrogen is separated out, the removal rate of the ammonia nitrogen reaches more than 95 percent, the ammonia nitrogen in the phenol ammonia wastewater is further removed, and a large amount of NO generated in the phenol ammonia wastewater in the subsequent incineration and pyrolysis process is reduced x And the treatment difficulty of the flue gas denitration workshop section is reduced.
Specifically, the ammonia absorption tower is filled with sulfuric acid solution for spraying and washing, so that ammonia blown out in low-temperature deamination is absorbed, and after the generated ammonium sulfate solution is saturated, an ammonium sulfate byproduct can be prepared to be used as a fertilizer or a humic acid fertilizer additive, so that ammonia in wastewater is recycled.
Specifically, the phenol ammonia wastewater incineration pyrolysis furnace takes residual raw gas generated by clean and efficient utilization of semi-coke enterprise coal as fuel, and the heat value of the raw gas is 1600Kcal/Nm 3 Incinerating and pyrolyzing the pretreated phenol-ammonia wastewater, spraying the phenol-ammonia wastewater into a pyrolysis furnace in a mist form through a high-pressure atomizing spray gun for full combustion, wherein a combustion system is in a negative pressure state (-1 to-10 mm H) 2 O), the burning temperature reaches 850-1100 ℃, the burning and burning removal rate reaches more than 99.9 percent, the gas generated by burning achieves the effect of complete burning without peculiar smell, stink and smoke, and the waste gasVarious pollutants such as hydrocarbon, phenols, ammonia nitrogen and the like in water are incinerated and pyrolyzed to be converted into nontoxic high-temperature gaseous inorganic substance H 2 O、CO 2 And NO X While trace amount of H in the raw gas 2 Conversion of S to SO 2 。
Specifically, the waste heat steam boiler exchanges heat with the incineration pyrolysis flue gas to reduce the temperature of the flue gas to 340 ℃, meanwhile recovers heat energy of the incineration pyrolysis flue gas, and enables the rated steam temperature to reach 195 ℃ to be used as a heat source for supplying semi-coke enterprises.
Specifically, the desulfurization and denitrification device is used for treating incineration pyrolysis flue gas and removing SO 2 And NO X The desulfurization device adopts a double-alkali desulfurization method, the denitration device adopts an SCR (selective catalytic reduction) mode for denitration, urea is used as a reducing agent, and finally the flue gas reaches the emission limit value of the emission Standard for pollutants in the coking chemical industry (GB 16171-2012), namely SO 2 ≤30mg/m 3 ，NO X ≤150mg/m 3 And the final fume exhaust temperature is lower than 120 ℃.
Examples
The present application, as shown in fig. 1, is further illustrated below by way of example, but the present application is not limited thereto.
Specifically, the flow rate of the phenol ammonia wastewater to be treated is 150m 3 D, pH value of 9.5, SS content of 1200mg/L, CODcr content of 35000mg/L, BOD 5 The method comprises the steps of extracting waste water with the content of 7000mg/L, the ammonia nitrogen content of 3000mg/L, the petroleum content of 2000mg/L, the volatile phenol content of 4500mg/L and the total phenol content of 9000mg/L, wherein the waste water enters a static pressure steady flow oil-water separation device after being extracted for one time, the temperature of the waste water in the device is kept at 40 ℃, the retention time is 150 hours, then the phenol-ammonia waste water automatically flows into a horizontal flow type guide and discharge oil precipitation tank, the horizontal average flow rate is 3.5mm/s, the retention time is 18 hours, floating oil in the waste water naturally floats and gathers on the surface of the tank, the floating oil is removed through an oil skimming tank and an oil scraper, SS settled on the lower layer is discharged through a mud pipe, then, the reinforced oil-water separation is further carried out, and the petroleum concentration of the waste water after the final treatment reaches 130mg/L.
Specifically, the deoiled wastewater enters a horizontal low-temperature ammonia stripping device, alkali liquor is added, after the pH is adjusted to 11, the temperature is increasedHeating to above 50 deg.C, and blowing to remove ammonia at-0.002 Mpa for 4 hr to remove free NH 3 Become gas phase NH 3 Separated to obtain gas-phase NH 3 The flow rate is 17.81kg/h, and the final ammonia nitrogen concentration in the wastewater reaches 150mg/L.
Specifically, a gas-phase product obtained by blowing off in a deamination tower is introduced into an ammonia absorption tower, a sulfuric acid solution is introduced into the ammonia absorption tower to be sprayed, washed and absorbed, the ammonia flow finally discharged into the atmosphere reaches below 2.5kg/h, and the ammonium sulfate generated by spraying and washing the sulfuric acid solution is 59kg/h, so that a byproduct of the ammonium sulfate can be prepared and used as a fertilizer, and the ammonia in the wastewater is recycled.
Specifically, the wastewater treated by the horizontal low-temperature ammonia stripping device is introduced into an incineration pyrolysis device for treatment, the flue gas is treated, and a combustion system is in a negative pressure state (-1 to-10 mm H) 2 O), combustion temperature 1100 deg.C, water pollutant all converted into H 2 O、CO 2 、SO 2 、NO X Adding 15kg/d of NaOH (Ca (OH)) into the gas substances, namely the gas pollutants in the incineration flue gas by using a double-alkali method 2 The adding amount is 10kg/h, the adding amount of urea for denitration by an SCR mode is 8kg/h, and finally the flue gas emission reaches SO 2 ：30mg/m 3 ，NO X ：150mg/m 3 And the smoke discharge temperature is finally less than 120 ℃.
Specifically, the phenol-ammonia wastewater is treated by the oil removal, deamination, incineration and pyrolysis process shown in fig. 1, and then the flue gas is discharged after reaching the standard, and the wastewater treatment cost is 46.88 yuan per ton of water.
Specifically, the phenol ammonia wastewater in the examples was treated by the process shown in table 1, and the treatment results and the economic calculation results are shown in table 1.
Table 1:
according to table 1, as can be seen from comparison of data of comparative examples 1-3 and examples, the method of the present application converts the high concentration organic pollution which is difficult to treat in the phenol-ammonia wastewater into gaseous inorganic substances which are easy to treat by performing deamination treatment on the phenol-ammonia wastewater, then performing treatment by using an incineration pyrolysis device, and finally performing standard discharge after treatment by using a flue gas desulfurization and denitrification device, and simultaneously by-producing ammonium sulfate and hot steam, and has the advantages of relatively less investment, simple process operation, small occupied area and capability of consuming surplus raw gas of enterprises.
It should be noted that, in the present document, the terms "comprises," "comprising," or any other variation, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising," does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A process for carrying out incineration and pyrolysis treatment on phenol-ammonia wastewater after pretreatment comprises the following steps:
A. static pressure and steady flow oil-water separation: lifting the phenol-ammonia wastewater to a static pressure steady flow oil-water separator by a pump for one time, removing coal tar in the wastewater by utilizing the action of gravity in the environment of static pressure and steady flow, and reducing petroleum pollutants in the wastewater;
B. advection drainage and oil drainage: the phenol-ammonia wastewater subjected to the oil-water separation and oil-removal treatment by static pressure and steady flow automatically flows into a advection guide and drainage oil tank, coal tar and suspended colloidal impurities in the wastewater are further removed by sedimentation, and meanwhile, micro oil beads and emulsified oil in the wastewater float upwards and are removed by an oil scraper, so that the effects of wastewater and oil separation are finally realized;
C. low-temperature deamination: after oil removal, the phenol ammonia wastewater enters a low-temperature deamination unit to blow off ammonia gas and is separated;
D. ammonia gas absorption: introducing ammonia escaped from the wastewater treated by the low-temperature deamination unit into an ammonia absorption tower, and recovering the ammonia by spraying and washing with a dilute sulfuric acid solution;
E. waste water incineration and pyrolysis: the phenol-ammonia wastewater after oil removal and deamination treatment enters an incineration pyrolysis unit, so that various high-concentration organic matters which are difficult to be biochemically degraded in the wastewater are subjected to chemical and physicochemical changes and converted into nontoxic high-temperature gaseous inorganic matters;
F. a waste heat steam boiler: the waste heat steam boiler is used for recycling heat energy in the flue gas and cooling the flue gas;
G. flue gas desulfurization and denitration treatment: after the flue gas generated by the waste water incineration and pyrolysis recovers heat energy through a waste heat steam boiler, the flue gas is discharged after reaching the standard through desulfurization and denitration treatment.
2. The incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment according to claim 1, characterized in that: in the step A, after the phenol-ammonia wastewater is lifted by the pump for the first time, the wastewater enters a static pressure steady flow area in the device to be subjected to oil-water separation by using the gravity action, light oil in the wastewater floats on an upper layer and is discharged through an oil removal port at the upper part of the device, heavy oil in the wastewater is settled on a lower layer and is discharged through an oil discharge port at the bottom of the device, and the wastewater subjected to oil removal automatically flows into the next unit.
3. The incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment according to claim 1, characterized in that: and B, utilizing a horizontal flow type guide-discharge oil separation tank in the step B, enabling colloid suspended in the wastewater, and impurities to settle from a water body so as to further remove petroleum, SS, enabling the wastewater to enter from one end and flow out from the other end, arranging a guide wall in the tank, prolonging the horizontal flow direction distance of the wastewater, reducing the horizontal flow speed of the wastewater, enabling oil impurities with relative density smaller than 1.0g/cm and larger particle size to float upwards and gather on the surface of the tank under the action of buoyancy, collecting and removing floating oil through an oil scraper and an oil skimming groove which are arranged on the surface of the tank, and settling the oil impurities with relative density larger than water at the bottom of the tank body through settling action in the wastewater to be discharged through a mud pipe.
4. The incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment according to claim 1, characterized in that: and in the step C, a horizontal low-temperature ammonia stripping device is utilized to strip ammonia in the wastewater.
5. The incineration pyrolysis treatment process for phenol-ammonia wastewater pretreatment according to claim 1, characterized in that: and D, introducing a sulfuric acid solution into an ammonia gas absorption tower for spray washing by using an ammonia gas absorption tower, so that the ammonia gas blown off in the step C is absorbed, and the generated ammonium sulfate byproduct can be used as a fertilizer or a humic acid fertilizer additive.
6. The incineration pyrolysis treatment process for phenol-ammonia wastewater pretreatment according to claim 1, characterized in that: and E, burning and pyrolyzing the pretreated phenol-ammonia wastewater by using a phenol-ammonia wastewater burning and pyrolyzing furnace and using the surplus raw gas generated by clean and efficient utilization of semi-coke enterprise coal as fuel, spraying the phenol-ammonia wastewater into the pyrolyzing furnace in a mist form through a high-pressure atomizing spray gun for full combustion, and converting various hydrocarbons and phenols in the wastewater into non-toxic high-temperature gaseous inorganic substance H through burning and pyrolysis 2 O、CO 2 And NO X While trace amount of H in the raw gas 2 Conversion of S to SO 2 。
7. The incineration pyrolysis treatment process for phenol-ammonia wastewater after pretreatment according to claim 1, characterized in that: and F, exchanging heat of the incineration pyrolysis flue gas by using a waste heat steam boiler to reduce the temperature of the flue gas, and recovering heat energy of the incineration pyrolysis flue gas to be used as a heat source for other production of a semicoke enterprise.
8. The process of claim 1, wherein the phenol-ammonia wastewater is pretreated and then incinerated for pyrolysis treatment: and G, treating the incineration pyrolysis flue gas by using a desulfurization and denitrification device to remove SO in the flue gas 2 And NO X The desulfurization device adopts one of an ammonia method, a limestone-gypsum wet method, a double-alkali method and the like, the denitration device can adopt an SNCR or SCR mode for denitration, and ammonia and urea are used as denitration reducing agents, so that the flue gas is finally discharged up to the standard.
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